CN114754350B - Heat recovery system, method and device - Google Patents

Heat recovery system, method and device Download PDF

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Publication number
CN114754350B
CN114754350B CN202210227607.8A CN202210227607A CN114754350B CN 114754350 B CN114754350 B CN 114754350B CN 202210227607 A CN202210227607 A CN 202210227607A CN 114754350 B CN114754350 B CN 114754350B
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China
Prior art keywords
heat recovery
heat exchanger
waste heat
low
water
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CN114754350A (en
Inventor
许继东
司派友
刘双白
梅隆
董伟
张晓斌
孔佑顺
徐琳涛
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State Grid Corp of China SGCC
North China Electric Power Research Institute Co Ltd
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State Grid Corp of China SGCC
North China Electric Power Research Institute Co Ltd
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Priority to CN202210227607.8A priority Critical patent/CN114754350B/en
Publication of CN114754350A publication Critical patent/CN114754350A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D11/00—Feed-water supply not provided for in other main groups
    • F22D11/02—Arrangements of feed-water pumps
    • F22D11/06—Arrangements of feed-water pumps for returning condensate to boiler
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/48—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers
    • F22B37/50—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers for draining or expelling water
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
    • F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Control Of Steam Boilers And Waste-Gas Boilers (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)

Abstract

The embodiment of the invention provides a heat recovery system, a heat recovery method and a heat recovery device, wherein the heat recovery system comprises: an atmospheric expansion vessel, a high-energy water waste heat recovery heat exchanger group and a condenser; the atmospheric expansion device is connected with the high-energy water waste heat recovery heat exchanger group, and the high-energy water waste heat recovery heat exchanger group is connected with the condenser; the atmospheric expansion vessel is used for releasing high-energy water, so that the high-energy water enters the high-energy water waste heat recovery heat exchanger group; the high-energy water waste heat recovery heat exchanger group is used for carrying out waste heat recovery on high-energy water, releasing the heat-dissipating drainage water, enabling the drainage water to enter the condenser, enabling the condenser to condense the drainage water into condensation water, improving water quality, saving water sources and heat energy, and improving engineering efficiency.

Description

Heat recovery system, method and device
Technical Field
The invention relates to the technical field of energy recovery, in particular to a heat recovery system, a heat recovery method and a heat recovery device.
Background
At present, a supercritical once-through boiler is mostly adopted in a large-scale domestic thermal power generating unit, and in order to prevent the water cooling wall from overtemperature, the minimum flow of water flow on the boiler must be ensured, and the normal liquid level of a steam-water separator is maintained. In the stage of newly-built unit boiler blowpipes, the unit is not vacuumized, and after a large amount of high-temperature drain water enters the condenser, the condensation water temperature is increased, so that the fine treatment cannot be put into operation, the water quality is seriously influenced, the water source is wasted, and the engineering efficiency is lower; during the starting or low-load operation of the unit, the condenser is in a vacuum state, a large amount of high-temperature boiler drain water directly enters the condenser, and although the condensation water temperature is not exceeded, the high-temperature drain water and the low-temperature condensation water are directly mixed, so that the problem of mismatching of energy utilization exists, and the waste of heat energy is caused.
Disclosure of Invention
The invention aims to provide a heat recovery system which can improve water quality, save water sources and heat energy and improve engineering efficiency. Another object of the present invention is to provide a heat recovery method. It is yet another object of the present invention to provide a heat recovery device. It is yet another object of the present invention to provide a computer readable medium. It is a further object of the invention to provide a computer device.
To achieve the above object, one aspect of the present invention discloses a heat recovery system comprising: an atmospheric expansion vessel, a high-energy water waste heat recovery heat exchanger group and a condenser; the atmospheric expansion device is connected with the high-energy water waste heat recovery heat exchanger group, and the high-energy water waste heat recovery heat exchanger group is connected with the condenser;
the atmospheric expansion vessel is used for releasing high-energy water, so that the high-energy water enters the high-energy water waste heat recovery heat exchanger group;
the high-energy water waste heat recovery heat exchanger group is used for carrying out waste heat recovery on high-energy water, releasing the heat-dissipation drainage water, and enabling the drainage water to enter the condenser for the condenser to condense the drainage water into condensation water.
Preferably, the system further comprises: a boiler drain pump and a drain outlet valve; the atmospheric expansion device is connected with the high-energy water waste heat recovery heat exchanger group through a boiler drain pump;
The boiler drain pump provides drain power for conveying high-energy water;
the drain outlet valve is arranged on a connecting pipeline between the drain pump of the boiler and the high-energy water waste heat recovery heat exchanger group and used for controlling the transportation of high-energy water.
Preferably, the system further comprises: a finishing device; the condenser is connected with the fine treatment device;
the fine treatment device is used for carrying out fine treatment on the condensed water released by the condenser and releasing the condensed water after the fine treatment.
Preferably, the system further comprises: a low pressure regenerative heater group and a deaerator; the fine treatment device is connected with a low-pressure regenerative heater group, and the low-pressure regenerative heater group is connected with a deaerator;
the low-pressure backheating heater group is used for heating the condensate after the fine treatment and conveying the heated condensate into the deaerator through the connecting pipeline so as to deoxidize the heated condensate by the deaerator.
Preferably, the system further comprises: a condensate pump; the condenser is connected with the fine treatment device through a condensate pump;
the condensate pump provides power for conveying condensate.
Preferably, the system further comprises: the bypass valve group comprises a first bypass valve, a second bypass valve, a third bypass valve, a fourth bypass valve and a fifth bypass valve;
The low-pressure regenerative heater group comprises a first low-pressure heater, a second low-pressure heater, a third low-pressure heater and a fourth low-pressure heater;
the first bypass valve is arranged on a connecting pipeline of the fine treatment device and the first low-pressure heater and used for controlling the conveying of the condensate water;
the second bypass valve is arranged on a connecting pipeline between the first low-pressure heater and the second low-pressure heater and used for controlling the conveying of condensed water;
the third bypass valve is arranged on a connecting pipeline between the second low-pressure heater and the third low-pressure heater and used for controlling the conveying of condensed water;
the fourth bypass valve is arranged on a connecting pipeline between the third low-pressure heater and the fourth low-pressure heater and used for controlling the conveying of the condensate water;
the fifth bypass valve is arranged on a connecting pipeline between the fourth low-pressure heater and the deaerator and used for controlling the conveying of the condensate water.
Preferably, the high-energy water waste heat recovery heat exchanger group comprises a first waste heat recovery heat exchanger, a second waste heat recovery heat exchanger, a third waste heat recovery heat exchanger, a fourth waste heat recovery heat exchanger and a fifth waste heat recovery heat exchanger, and each waste heat recovery heat exchanger in the high-energy water waste heat recovery heat exchanger group comprises a heat release side;
The boiler drain pump is connected with the heat release side of the first waste heat recovery heat exchanger;
the heat release side of the first waste heat recovery heat exchanger is connected with the heat release side of the second waste heat recovery heat exchanger;
the heat release side of the second waste heat recovery heat exchanger is connected with the heat release side of the third waste heat recovery heat exchanger;
the heat release side of the third waste heat recovery heat exchanger is connected with the heat release side of the fourth waste heat recovery heat exchanger;
the heat release side of the fourth waste heat recovery heat exchanger is connected with the heat release side of the fifth waste heat recovery heat exchanger;
the heat release side of the fifth waste heat recovery heat exchanger is connected with the condenser.
Preferably, the system further comprises: the main way valve group comprises a first main way valve, a second main way valve, a third main way valve, a fourth main way valve, a fifth main way valve, a sixth main way valve, a seventh main way valve, an eighth main way valve, a ninth main way valve and a tenth main way valve;
each waste heat recovery heat exchanger in the high-energy water waste heat recovery heat exchanger group further comprises a heat absorption side;
the first main path valve is arranged on a connecting pipeline between the fine treatment device and the heat absorption side of the first waste heat recovery heat exchanger and is used for controlling the conveying of condensed water;
the second main valve is arranged on a connecting pipeline between the heat absorption side of the first waste heat recovery heat exchanger and the first low-pressure heater and used for controlling the transportation of condensed water;
The third main path valve is arranged on a connecting pipeline between the first low-pressure heater and the heat absorption side of the second waste heat recovery heat exchanger and used for controlling the conveying of condensate water;
the fourth main valve is arranged on a connecting pipeline between the heat absorption side of the second waste heat recovery heat exchanger and the second low-pressure heater and is used for controlling the transportation of condensed water;
the fifth main path valve is arranged on a connecting pipeline between the second low-pressure heater and the heat absorption side of the third waste heat recovery heat exchanger and used for controlling the transportation of condensed water;
the sixth main path valve is arranged on a connecting pipeline between the heat absorption side of the third waste heat recovery heat exchanger and the third low-pressure heater and is used for controlling the transportation of condensed water;
the seventh main valve is arranged on a connecting pipeline between the third low-pressure heater and the heat absorption side of the fourth waste heat recovery heat exchanger and used for controlling the transportation of condensate water;
the eighth main path valve is arranged on a connecting pipeline between the heat absorption side of the fourth waste heat recovery heat exchanger and the fourth low-pressure heater and is used for controlling the transportation of condensed water;
the ninth main path valve is arranged on a connecting pipeline between the fourth low-pressure heater and the heat absorption side of the fifth waste heat recovery heat exchanger and is used for controlling the conveying of condensate water;
The tenth main path valve is arranged on a connecting pipeline between the heat absorption side of the fifth waste heat recovery heat exchanger and the deaerator and is used for controlling the conveying of the condensate water.
The invention also discloses a heat recovery method, which comprises the following steps:
when the boiler is in wet state operation, the atmospheric expansion vessel is controlled to release high-energy water, so that the high-energy water enters the high-energy water waste heat recovery heat exchanger group, the high-energy water waste heat recovery heat exchanger group is used for carrying out waste heat recovery on the high-energy water, and the heat-dissipating drainage is released, so that the drainage enters the condenser, and the condenser condenses the drainage into condensation water.
Preferably, controlling the atmospheric expander to release the high energy water such that the high energy water enters the high energy water waste heat recovery heat exchanger group comprises:
and controlling the opening of a drain outlet valve to enable the high-energy water released by the atmospheric expansion vessel to enter the high-energy water waste heat recovery heat exchanger group.
Preferably, the method further comprises:
when the boiler is in wet state, the main path valve group is controlled to be opened, the bypass valve group is closed, so that the condensate water released from the condenser enters the fine treatment device for fine treatment, and the condensate water after the fine treatment is heated by the low-pressure backheating heater group and the high-energy water waste heat recovery heat exchanger group and is conveyed to the deaerator.
Preferably, the method further comprises:
when the boiler is in dry state, the drain pump and the main valve group of the boiler are controlled to be closed, and the bypass valve group is opened, so that the condensate released from the condenser enters the fine treatment device for fine treatment, and the condensate after the fine treatment is heated by the low-pressure regenerative heater group and is conveyed to the deaerator.
The invention also discloses a heat recovery device, which comprises:
the release unit is used for controlling the atmospheric expansion vessel to release high-energy water when the boiler is in wet state operation, so that the high-energy water enters the high-energy water waste heat recovery heat exchanger group, the high-energy water waste heat recovery heat exchanger group is used for carrying out waste heat recovery on the high-energy water, and the discharged drain water is released, so that the drain water enters the condenser, and the condenser condenses the drain water into condensed water.
The invention also discloses a computer readable medium having stored thereon a computer program which when executed by a processor implements a method as described above.
The invention also discloses a computer device comprising a memory for storing information comprising program instructions and a processor for controlling the execution of the program instructions, the processor implementing the method as described above when executing the program.
The heat recovery system of the present invention includes: an atmospheric expansion vessel, a high-energy water waste heat recovery heat exchanger group and a condenser; the atmospheric expansion device is connected with the high-energy water waste heat recovery heat exchanger group, and the high-energy water waste heat recovery heat exchanger group is connected with the condenser; the atmospheric expansion vessel is used for releasing high-energy water, so that the high-energy water enters the high-energy water waste heat recovery heat exchanger group; the high-energy water waste heat recovery heat exchanger group is used for carrying out waste heat recovery on high-energy water, releasing the heat-dissipating drainage water, enabling the drainage water to enter the condenser, enabling the condenser to condense the drainage water into condensation water, improving water quality, saving water sources and heat energy, and improving engineering efficiency.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a heat recovery system according to an embodiment of the present invention;
FIG. 2 is a flow chart of a heat recovery method according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a heat recovery device according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a computer device according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order to facilitate understanding of the technical solutions provided in the present application, the following description will first explain relevant content of the technical solutions of the present application. At present, a supercritical once-through boiler is mostly adopted in a large-scale domestic thermal power generating unit, because the supercritical boiler has no fixed steam-water separation point, in order to prevent the water-cooled wall from being overtemperature during the starting process and low-load operation of the boiler, the minimum flow of water flow on the boiler must be ensured, and the normal liquid level of the steam-water separator is maintained, so that the boiler is in a wet state operation state. Steam generated by starting the steam-water separator of the boiler enters a superheated steam system of the boiler, and generated drain water enters an atmospheric expansion vessel. The drain in the atmospheric expansion vessel is sent back to the condenser by the drain pump of the boiler.
Fig. 1 is a schematic structural diagram of a heat recovery system according to an embodiment of the present invention, as shown in fig. 1, the system includes: an atmospheric expansion vessel 110, a high-energy water waste heat recovery heat exchanger group 120 and a condenser 130. The atmospheric expansion vessel 110 is connected with the high-energy water waste heat recovery heat exchanger group 120, and the high-energy water waste heat recovery heat exchanger group 120 is connected with the condenser 130. As shown in fig. 1, the high-energy water heat recovery heat exchanger group 120 is indicated by a chain line, and the high-energy water heat recovery heat exchanger group 120 includes a plurality of heat recovery heat exchangers each including a heat release side and a heat absorption side. Specifically, the outlet of the atmospheric expansion device 110 is connected to the heat release side inlet of the high-energy water waste heat recovery heat exchanger group 120, and the heat release side outlet of the high-energy water waste heat recovery heat exchanger group 120 is connected to the inlet of the condenser 130.
The atmospheric flash tank 110 is used to release the high energy water so that the high energy water enters the high energy water waste heat recovery heat exchanger bank 120.
The high-energy water waste heat recovery heat exchanger set 120 is used for carrying out waste heat recovery on high-energy water, releasing the heat-dissipating drain water, so that the drain water enters the condenser 130, and the condenser 130 condenses the drain water into condensed water.
In an embodiment of the present invention, the system further includes: a boiler drain pump 140 and a drain outlet valve 150. Specifically, the atmospheric flash tank 110 is connected to the high energy water heat recovery heat exchanger bank 120 through a boiler drain pump 140 and a drain outlet valve 150. Specifically, the outlet of the atmospheric expansion vessel 110 is connected with the boiler drain pump 140, the boiler drain pump 140 is connected with the drain outlet valve 150, the drain outlet valve 150 is connected with the heat release side inlet of the high-energy water waste heat recovery heat exchanger group 120, and the high-energy water released by the atmospheric expansion vessel 110 enters the high-energy water waste heat recovery heat exchanger group 120 through the boiler drain pump 140 and the drain outlet valve 150.
The boiler drain pump 140 provides a drain power for delivering high energy water.
The drain outlet valve 150 is disposed on a connection pipe between the boiler drain pump 140 and the high-energy water waste heat recovery heat exchanger group 120, for controlling the delivery of high-energy water.
In an embodiment of the present invention, the system further includes: finishing device 160. The condenser 130 is connected to the finishing device 160. Specifically, the outlet of the condenser 130 is connected to the inlet of the finishing device 160.
The finishing device 160 is used for finishing the condensed water released by the condenser 130 and releasing the finished condensed water.
In the embodiment of the invention, the fine treatment device 160 is a condensate fine treatment device, and the condensate fine treatment device is an important auxiliary device of a large-sized unit drum boiler and a once-through boiler, and the safe and stable operation of the device plays a key role on the water supply quality of the boiler. The condensate water fine treatment device adopts a filtering and mixed bed treatment mode, the quality of the output condensate water is stable, and the influence of blockage caused by a filter screen at the inlet of the feed pump is reduced.
In an embodiment of the present invention, the system further includes: low pressure regenerative heater block 170 and deaerator 180. The finishing device 160 is connected with a low-pressure regenerative heater group 170, and the low-pressure regenerative heater group 170 is connected with a deaerator 180. As shown in fig. 1, the low-pressure regenerative heater group 170 is shown with a dotted line, and the low-pressure regenerative heater group 170 includes a plurality of low-pressure regenerative heaters. Specifically, the outlet of the finishing device 160 is connected to the inlet of the low-pressure regenerative heater group 170, and the outlet of the low-pressure regenerative heater group 170 is connected to the inlet of the deaerator 180.
The low-pressure regenerative heater group 170 is used for heating the refined condensate water and conveying the heated condensate water to the deaerator 180 through a connecting pipeline so that the deaerator 180 deaerates the heated condensate water. Deaerator 180 is one of the key devices of the boiler and heating system, removes oxygen and other gases dissolved in the feedwater, and prevents and reduces corrosion of boiler feedwater piping, economizers, and other ancillary equipment.
In the embodiment of the invention, the system further comprises: condensate pump 190. The condenser 130 is connected to the finishing device 160 through a condensate pump 190. Specifically, the outlet of the condenser 130 is connected to the inlet of the finishing device 160 through a condensate pump 190.
The condensate pump 190 provides the motive force for delivering condensate from the outlet of the condenser 130 to the inlet of the treated device 160.
In the embodiment of the invention, the system further comprises: a bypass valve group including a first bypass valve 201, a second bypass valve 202, a third bypass valve 203, a fourth bypass valve 204, and a fifth bypass valve 205. The low-pressure regenerative heater group 170 includes a first low-pressure heater 171, a second low-pressure heater 172, a third low-pressure heater 173, and a fourth low-pressure heater 174.
In the embodiment of the present invention, the first bypass valve 201 is disposed on a connecting pipe between the finishing device 160 and the first low pressure heater 171, for controlling the delivery of the condensate. Specifically, the outlet of the finishing device 160 is connected to one end of the first bypass valve 201, and the other end of the first bypass valve 201 is connected to the inlet of the first low pressure heater 171.
In the embodiment of the present invention, the second bypass valve 202 is disposed on the connecting pipe between the first low pressure heater 171 and the second low pressure heater 172, for controlling the delivery of the condensate. Specifically, the outlet of the first low pressure heater 171 is connected to one end of the second bypass valve 202, and the other end of the second bypass valve 202 is connected to the inlet of the second low pressure heater 172.
In the embodiment of the present invention, the third bypass valve 203 is disposed on the connecting pipe between the second low pressure heater 172 and the third low pressure heater 173, for controlling the delivery of the condensate. Specifically, the outlet of the second low pressure heater 172 is connected to one end of the third bypass valve 203, and the other end of the third bypass valve 203 is connected to the inlet of the third low pressure heater 173.
In the embodiment of the present invention, the fourth bypass valve 204 is disposed on the connecting pipe between the third low pressure heater 173 and the fourth low pressure heater 174, for controlling the delivery of the condensate. Specifically, the outlet of the third low pressure heater 173 is connected to one end of the fourth bypass valve 204, and the other end of the fourth bypass valve 204 is connected to the inlet of the fourth low pressure heater 174.
In the embodiment of the present invention, the fifth bypass valve 205 is disposed on the connecting pipe between the fourth low pressure heater 174 and the deaerator 180, for controlling the delivery of the condensate. Specifically, the outlet of the fourth low pressure heater 174 is connected to one end of the fifth bypass valve 205, and the other end of the fifth bypass valve 205 is connected to the inlet of the deaerator 180.
In the embodiment of the present invention, the high-energy water heat recovery heat exchanger set 120 includes a first heat recovery heat exchanger 121, a second heat recovery heat exchanger 122, a third heat recovery heat exchanger 123, a fourth heat recovery heat exchanger 124 and a fifth heat recovery heat exchanger 125, and each heat recovery heat exchanger in the high-energy water heat recovery heat exchanger set 120 includes a heat release side.
As shown in fig. 1, a boiler drain pump 140 is connected to a heat release side inlet of the first heat recovery heat exchanger 121; the heat release side outlet of the first heat recovery heat exchanger 121 is connected with the heat release side inlet of the second heat recovery heat exchanger 122; the heat release side outlet of the second heat recovery heat exchanger 122 is connected with the heat release side inlet of the third heat recovery heat exchanger 123; the heat release side outlet of the third heat recovery heat exchanger 123 is connected with the heat release side inlet of the fourth heat recovery heat exchanger 124; the heat release side outlet of the fourth heat recovery heat exchanger 124 is connected with the heat release side inlet of the fifth heat recovery heat exchanger 125; the heat release side outlet of the fifth heat recovery heat exchanger 125 is connected to the condenser 130.
In the embodiment of the invention, the system further comprises: a main path valve group, wherein the main path valve group comprises a first main path valve 211, a second main path valve 212, a third main path valve 213, a fourth main path valve 214, a fifth main path valve 215, a sixth main path valve 216, a seventh main path valve 217, an eighth main path valve 218, a ninth main path valve 219 and a tenth main path valve 220, and each waste heat recovery heat exchanger in the high-energy water waste heat recovery heat exchanger group further comprises a heat absorbing side.
As shown in fig. 1, the first main valve 211 is disposed on a connection pipe between the finishing device 160 and the heat absorbing side of the first heat recovery heat exchanger 121, for controlling the delivery of the condensate. Specifically, the finishing device 160 is connected to one end of the first main valve 211, and the other end of the first main valve 211 is connected to the heat-absorbing side inlet of the first heat recovery heat exchanger 121.
The second main path valve 212 is disposed on a connection pipe between the heat absorbing side of the first heat recovery heat exchanger 121 and the first low pressure heater 171, for controlling the delivery of the condensed water. Specifically, the heat absorbing side outlet of the first heat recovery heat exchanger 121 is connected to one end of the second main path valve 212, and the other end of the second main path valve 212 is connected to the inlet of the first low pressure heater 171.
The third main path valve 213 is disposed on a connection pipe between the first low pressure heater 171 and the heat absorbing side of the second heat recovery heat exchanger 122, for controlling the delivery of condensate. Specifically, the outlet of the first low pressure heater 171 is connected to the end of the third main path valve 213, and the other end of the third main path valve 213 is connected to the heat absorbing side inlet of the second heat recovery heat exchanger 122.
The fourth main valve 214 is disposed on a connection pipe between the heat absorbing side of the second heat recovery heat exchanger 122 and the second low pressure heater 172, for controlling the delivery of the condensate. Specifically, the heat absorbing side outlet of the second heat recovery heat exchanger 122 is connected to one end of the fourth main path valve 214, and the other end of the fourth main path valve 214 is connected to the inlet of the second low pressure heater 172.
The fifth main valve 215 is disposed on a connection pipe between the second low pressure heater 172 and the heat absorbing side of the third heat recovery heat exchanger 123, for controlling the delivery of the condensed water. Specifically, the outlet of the second low pressure heater 172 is connected to one end of the fifth main valve 215, and the other end of the fifth main valve 215 is connected to the heat absorbing side inlet of the third heat recovery heat exchanger 123.
The sixth main path valve 216 is disposed on a connection pipe between the heat absorbing side of the third heat recovery heat exchanger 123 and the third low pressure heater 173, for controlling the delivery of the condensate. Specifically, the heat absorbing side outlet of the third heat recovery heat exchanger 123 is connected to one end of the sixth main path valve 216, and the other end of the sixth main path valve 216 is connected to the inlet of the third low pressure heater 173.
The seventh main path valve 217 is disposed on a connection pipe between the third low pressure heater 173 and the heat absorbing side of the fourth heat recovery heat exchanger 124, for controlling the delivery of the condensed water. Specifically, the outlet of the third low pressure heater 173 is connected to one end of the seventh main path valve 217, and the other end of the seventh main path valve 217 is connected to the heat absorbing side inlet of the fourth heat recovery heat exchanger 124.
An eighth main valve 218 is provided on a connection pipe between the heat absorbing side of the fourth heat recovery heat exchanger 124 and the fourth low pressure heater 174 for controlling the delivery of condensate. Specifically, the heat absorbing side outlet of the fourth heat recovery heat exchanger 124 is connected to one end of the eighth main circuit valve 218, and the other end of the eighth main circuit valve 218 is connected to the inlet of the fourth low pressure heater 174.
A ninth main path valve 219 is provided on a connection pipe between the fourth low pressure heater 174 and the heat absorbing side of the fifth heat recovery heat exchanger 125 for controlling the delivery of condensate. Specifically, the outlet of the fourth low pressure heater 174 is connected to one end of a ninth main passage valve 219, and the other end of the ninth main passage valve 219 is connected to the heat-absorbing-side inlet of the fifth heat recovery heat exchanger 125.
The tenth main path valve 220 is disposed on a connection pipe between the heat absorbing side of the fifth heat recovery heat exchanger 125 and the deaerator 180, for controlling the transportation of the condensed water. The heat absorbing side outlet of the fifth heat recovery heat exchanger 125 is connected to one end of a tenth main path valve 220, and the other end of the tenth main path valve 220 is connected to the inlet of the deaerator 180.
In the embodiment of the invention, the atmospheric expansion vessel 110 releases high-energy water, the high-energy water sequentially passes through the boiler drain pump 140 and the drain outlet valve 150, and enters the high-energy water waste heat recovery heat exchanger group 120 to exchange heat and release the heat-dissipating drain water, so that the heat-dissipating drain water enters the condenser 130, the condenser 130 condenses the drain water into condensed water, the condensed water passes through the condensed water pump 190 to reach the finishing device 160 to be subjected to finishing treatment, the water quality is improved, the condensed water enters the low-pressure heat recovery heater group 170 to be heated, and the heated condensed water is conveyed to the deaerator 180 through the connecting pipeline to be deoxidized by the deaerator 180.
In the technical scheme provided by the embodiment of the invention, the heat recovery system comprises: an atmospheric expansion vessel, a high-energy water waste heat recovery heat exchanger group and a condenser; the atmospheric expansion device is connected with the high-energy water waste heat recovery heat exchanger group, and the high-energy water waste heat recovery heat exchanger group is connected with the condenser; the atmospheric expansion vessel is used for releasing high-energy water, so that the high-energy water enters the high-energy water waste heat recovery heat exchanger group; the high-energy water waste heat recovery heat exchanger group is used for carrying out waste heat recovery on high-energy water, releasing the heat-dissipating drainage water, enabling the drainage water to enter the condenser, enabling the condenser to condense the drainage water into condensation water, improving water quality, saving water sources and heat energy, and improving engineering efficiency.
It should be noted that the heat recovery system shown in fig. 1 is also applicable to the heat recovery method of fig. 2, and will not be described herein.
The implementation process of the heat recovery method provided by the embodiment of the invention is described below by taking the heat recovery device as an execution main body. It is understood that the execution body of the heat recovery method provided by the embodiment of the invention includes, but is not limited to, a heat recovery device.
Fig. 2 is a flowchart of a heat recovery method according to an embodiment of the present invention, and as shown in fig. 2, the method is applied to a newly built unit boiler blowing pipe period and a unit start-up and low load operation period, and the boiler is in wet operation, including:
step 101, controlling the atmospheric expander to release high-energy water, enabling the high-energy water to enter the high-energy water waste heat recovery heat exchanger group, enabling the high-energy water waste heat recovery heat exchanger group to conduct waste heat recovery on the high-energy water, releasing heat-dissipating drain water, enabling the drain water to enter the condenser, and enabling the condenser to condense the drain water into condensed water.
In the embodiment of the invention, the heat recovery device controls the opening of the drain outlet valve, so that the high-energy water released by the atmospheric expansion device enters the high-energy water waste heat recovery heat exchanger group, and passes through the first waste heat recovery heat exchanger, the second waste heat recovery heat exchanger, the third waste heat recovery heat exchanger, the fourth waste heat recovery heat exchanger and the fifth waste heat recovery heat exchanger in sequence to carry out waste heat recovery, and the cooled drain is released.
Step 102, controlling to open a main path valve group and closing a bypass valve group, so that the condensate released in the condenser enters a fine treatment device for fine treatment, and the fine treated condensate is heated by a low-pressure backheating heater group and a high-energy water waste heat recovery heat exchanger group and is conveyed to a deaerator.
In the embodiment of the invention, the heat recovery device controls the opening of the main path valve group and the closing of the bypass valve group, so that the main path of the system runs, the condensed water in the condenser enters the fine treatment device for fine treatment through the condensed water pump, and the condensed water released by the fine treatment device is the condensed water with qualified water quality.
Specifically, the condensate water after the fine treatment enters the heat absorption side inlet of the fifth waste heat recovery heat exchanger through the first main valve, passes through the fifth waste heat recovery heat exchanger and is output through the heat absorption side outlet of the waste heat recovery heat exchanger; the output condensate enters the inlet of the first low-pressure heater through the second main valve, passes through the first low-pressure heater and then is output through the outlet of the first low-pressure heater; the output condensate water enters the heat absorption side inlet of the fourth waste heat recovery heat exchanger through the third main valve, passes through the fourth waste heat recovery heat exchanger and then is output through the heat absorption side outlet of the fourth waste heat recovery heat exchanger; the output condensate enters the inlet of the second low-pressure heater through the fourth main valve, passes through the second low-pressure heater and then is output through the outlet of the second low-pressure heater; the output condensate water enters the heat absorption side inlet of the third waste heat recovery heat exchanger through a fifth main valve, passes through the third waste heat recovery heat exchanger and then is output through the heat absorption side outlet of the third waste heat recovery heat exchanger; the output condensate enters the inlet of the third low-pressure heater through the sixth main path valve, passes through the third low-pressure heater and then is output through the outlet of the third low-pressure heater; the output condensate water enters the heat absorption side inlet of the second waste heat recovery heat exchanger through a seventh main valve, passes through the second waste heat recovery heat exchanger and then is output through the heat absorption side outlet of the second waste heat recovery heat exchanger; the output condensate enters the inlet of the fourth low-pressure heater through the eighth main path valve, passes through the fourth low-pressure heater and then is output through the outlet of the fourth low-pressure heater; the output condensate water enters the heat absorption side inlet of the first waste heat recovery heat exchanger through a ninth main path valve, passes through the first waste heat recovery heat exchanger and then is output through the heat absorption side outlet of the first waste heat recovery heat exchanger; and the output condensed water enters the deaerator through a tenth main path valve to be deaerated.
In the embodiment of the invention, during the period of newly-built unit boiler blowpipes, the boiler drain water heats the condensed water temperature through the high-energy water waste heat recovery heat exchanger group, thereby reducing the heating steam quantity of the deaerator and improving the heat economy; meanwhile, the drainage temperature of the boiler is reduced, so that the temperature of the condensed water in the condenser is not over-temperature, the drainage of the boiler can be recovered normally, the drainage waste of the boiler is avoided, water resources are saved, the fine treatment can be used normally, the quality of water is ensured to be qualified, and the safe operation of a unit is facilitated.
In the embodiment of the invention, the boiler is in wet state operation in the initial starting stage or in the low-load operation period of the unit, and the condensed water is sequentially heated by each waste heat recovery heat exchanger group in the high-energy water waste heat recovery heat exchanger group, so that the gradient heating of the condensed water is realized, the hydrophobic heat of the boiler is recovered, the low-pressure steam extraction amount of each stage is reduced, and the thermal efficiency of the unit is improved.
Further, when the boiler is in dry state operation, the heat recovery device controls to close the drain pump and the main path valve group of the boiler, and opens the bypass valve group, so that the system bypasses operation, the condensate released in the condenser enters the fine treatment device for fine treatment, and the condensate after the fine treatment is heated by the low-pressure regenerative heater group and is conveyed to the deaerator. Wherein, the condensate released by the fine treatment device is the condensate with qualified water quality.
Specifically, the condensate after the fine treatment enters the inlet of the first low-pressure heater through the first bypass valve, passes through the first low-pressure heater and is output through the outlet of the first low-pressure heater; the output condensate enters the inlet of the second low-pressure heater through the second bypass valve, passes through the second low-pressure heater and then is output through the outlet of the second low-pressure heater; the output condensate water enters the inlet of the third low-pressure heater through the third bypass valve, passes through the third low-pressure heater and then is output through the outlet of the third low-pressure heater; the output condensate enters the inlet of the fourth low-pressure heater through the fourth bypass valve, passes through the fourth low-pressure heater and then is output through the outlet of the fourth low-pressure heater; and the output condensate enters the deaerator through a fifth bypass valve to be deaerated.
In the embodiment of the invention, during the dry running period of the boiler, the system in the heat recovery system bypasses the operation, the high-energy water waste heat recovery heat exchanger group exits the operation, and the resistance in the flowing process of the condensed water is reduced.
According to the technical scheme of the heat recovery method provided by the embodiment of the invention, when the boiler is in wet state operation, the atmospheric expansion device is controlled to release high-energy water, so that the high-energy water enters the high-energy water waste heat recovery heat exchanger group, the high-energy water waste heat recovery heat exchanger group is used for carrying out waste heat recovery on the high-energy water, and the cooled drain water is released, so that the drain water enters the condenser to be condensed into condensed water by the condenser, the water quality can be improved, the water source and the heat energy can be saved, and the engineering efficiency can be improved.
Fig. 3 is a schematic structural diagram of a heat recovery device according to an embodiment of the present invention, where the heat recovery device is configured to perform the above heat recovery method, and as shown in fig. 3, the device includes: a release unit 11.
The release unit 11 is used for controlling the atmospheric expansion vessel to release high-energy water when the boiler is in wet operation, so that the high-energy water enters the high-energy water waste heat recovery heat exchanger group, the high-energy water waste heat recovery heat exchanger group is used for carrying out waste heat recovery on the high-energy water, and the cooled drain water is released, so that the drain water enters the condenser, and the condenser condenses the drain water into condensed water.
In the embodiment of the present invention, the release unit 11 is specifically configured to control the opening of the drain outlet valve, so that the high-energy water released by the atmospheric expansion vessel enters the high-energy water waste heat recovery heat exchanger group.
In the embodiment of the invention, the device further comprises: a control unit 12.
The control unit 12 is used for controlling to open the main path valve group and close the bypass valve group when the boiler is in wet state operation, so that the condensate water released in the condenser enters the fine treatment device for fine treatment, and the condensate water after the fine treatment is heated by the low-pressure regenerative heater group and the high-energy water waste heat recovery heat exchanger group and is conveyed to the deaerator.
In the embodiment of the present invention, the control unit 12 is further configured to control to close the drain pump and the main valve set of the boiler and open the bypass valve set when the boiler is in a dry state, so that the condensate released in the condenser enters the fine treatment device for fine treatment, and heat the fine treated condensate through the low-pressure regenerative heater set and convey the condensate to the deaerator.
In the scheme of the embodiment of the invention, when the boiler is in wet state operation, the atmospheric expander is controlled to release high-energy water, so that the high-energy water enters the high-energy water waste heat recovery heat exchanger group, the high-energy water waste heat recovery heat exchanger group is used for carrying out waste heat recovery on the high-energy water, and the cooled drain water is released, so that the drain water enters the condenser to enable the condenser to condense the drain water into condensed water, thereby improving water quality, saving water source and heat energy and improving engineering efficiency.
The system, apparatus, module or unit set forth in the above embodiments may be implemented in particular by a computer chip or entity, or by a product having a certain function. A typical implementation device is a computer device, which may be, for example, a personal computer, a laptop computer, a cellular telephone, a camera phone, a smart phone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.
An embodiment of the present invention provides a computer device, including a memory and a processor, where the memory is configured to store information including program instructions, and the processor is configured to control execution of the program instructions, and when the program instructions are loaded and executed by the processor, implement steps of an embodiment of the heat recovery method described above, and a specific description may be referred to an embodiment of the heat recovery method described above.
Referring now to FIG. 4, there is illustrated a schematic diagram of a computer device 600 suitable for use in implementing embodiments of the present application.
As shown in fig. 4, the computer apparatus 600 includes a Central Processing Unit (CPU) 601, which can perform various appropriate works and processes according to a program stored in a Read Only Memory (ROM) 602 or a program loaded from a storage section 608 into a Random Access Memory (RAM)) 603. In the RAM603, various programs and data required for the operation of the computer device 600 are also stored. The CPU601, ROM602, and RAM603 are connected to each other through a bus 604. An input/output (I/O) interface 605 is also connected to bus 604.
The following components are connected to the I/O interface 605: an input portion 606 including a keyboard, mouse, etc.; an output portion 607 including a Cathode Ray Tube (CRT), a liquid crystal feedback device (LCD), and the like, and a speaker, and the like; a storage section 608 including a hard disk and the like; and a communication section 609 including a network interface card such as a LAN card, a modem, or the like. The communication section 609 performs communication processing via a network such as the internet. The drive 610 is also connected to the I/O interface 606 as needed. Removable media 611 such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, or the like is mounted on drive 610 as needed, so that a computer program read therefrom is mounted as needed as storage section 608.
In particular, according to embodiments of the present invention, the processes described above with reference to flowcharts may be implemented as computer software programs. For example, embodiments of the present invention include a computer program product comprising a computer program tangibly embodied on a machine-readable medium, the computer program comprising program code for performing the method shown in the flowchart. In such an embodiment, the computer program may be downloaded and installed from a network through the communication portion 609, and/or installed from the removable medium 611.
Computer readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device. Computer-readable media, as defined herein, does not include transitory computer-readable media (transmission media), such as modulated data signals and carrier waves.
For convenience of description, the above devices are described as being functionally divided into various units, respectively. Of course, the functions of each element may be implemented in one or more software and/or hardware elements when implemented in the present application.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises the element.
The data acquisition, storage, use, processing and the like in the technical scheme meet the relevant regulations of national laws and regulations.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The application may be described in the general context of computer-executable instructions, such as program modules, being executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. The application may also be practiced in distributed computing environments where tasks are performed by remote processing devices that are linked through a communications network. In a distributed computing environment, program modules may be located in both local and remote computer storage media including memory storage devices.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for system embodiments, since they are substantially similar to method embodiments, the description is relatively simple, as relevant to see a section of the description of method embodiments.
The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and changes may be made to the present application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. which are within the spirit and principles of the present application are intended to be included within the scope of the claims of the present application.

Claims (11)

1. A heat recovery system, the system comprising: an atmospheric expansion vessel, a high-energy water waste heat recovery heat exchanger group and a condenser; the atmospheric expansion vessel is connected with the high-energy water waste heat recovery heat exchanger group, and the high-energy water waste heat recovery heat exchanger group is connected with the condenser;
the atmospheric expansion vessel is used for releasing high-energy water so that the high-energy water enters the high-energy water waste heat recovery heat exchanger group;
the high-energy water waste heat recovery heat exchanger group is used for carrying out waste heat recovery on high-energy water, releasing the heat-dissipating drainage water, and enabling the drainage water to enter the condenser so as to enable the condenser to condense the drainage water into condensed water;
the system further comprises: the device comprises a fine treatment device, a low-pressure regenerative heater group and a deaerator;
the fine treatment device is connected with the low-pressure regenerative heater group, and the low-pressure regenerative heater group is connected with the deaerator;
The low-pressure regenerative heater group is used for heating the refined condensate water and conveying the heated condensate water to the deaerator through a connecting pipeline so as to deoxidize the heated condensate water by the deaerator;
the high-energy water waste heat recovery heat exchanger group comprises a first waste heat recovery heat exchanger, a second waste heat recovery heat exchanger, a third waste heat recovery heat exchanger, a fourth waste heat recovery heat exchanger and a fifth waste heat recovery heat exchanger;
the system further comprises: a bypass valve group including a first bypass valve, a second bypass valve, a third bypass valve, a fourth bypass valve, and a fifth bypass valve;
the low-pressure regenerative heater group comprises a first low-pressure heater, a second low-pressure heater, a third low-pressure heater and a fourth low-pressure heater;
the first bypass valve is arranged on a connecting pipeline of the fine treatment device and the first low-pressure heater and is used for controlling the conveying of condensed water;
the second bypass valve is arranged on a connecting pipeline between the first low-pressure heater and the second low-pressure heater and is used for controlling the transportation of condensed water;
the third bypass valve is arranged on a connecting pipeline between the second low-pressure heater and the third low-pressure heater and is used for controlling the transportation of condensed water;
The fourth bypass valve is arranged on a connecting pipeline between the third low-pressure heater and the fourth low-pressure heater and is used for controlling the transportation of condensed water;
the fifth bypass valve is arranged on a connecting pipeline between the fourth low-pressure heater and the deaerator and is used for controlling the transportation of condensed water;
the high-energy water waste heat recovery heat exchanger group comprises a first waste heat recovery heat exchanger, a second waste heat recovery heat exchanger, a third waste heat recovery heat exchanger, a fourth waste heat recovery heat exchanger and a fifth waste heat recovery heat exchanger, and each waste heat recovery heat exchanger in the high-energy water waste heat recovery heat exchanger group comprises a heat release side;
the boiler drain pump is connected with the heat release side of the first waste heat recovery heat exchanger;
the heat release side of the first waste heat recovery heat exchanger is connected with the heat release side of the second waste heat recovery heat exchanger;
the heat release side of the second waste heat recovery heat exchanger is connected with the heat release side of the third waste heat recovery heat exchanger;
the heat release side of the third waste heat recovery heat exchanger is connected with the heat release side of the fourth waste heat recovery heat exchanger;
the heat release side of the fourth waste heat recovery heat exchanger is connected with the heat release side of the fifth waste heat recovery heat exchanger;
The heat release side of the fifth waste heat recovery heat exchanger is connected with the condenser;
the system further comprises: the main way valve group comprises a first main way valve, a second main way valve, a third main way valve, a fourth main way valve, a fifth main way valve, a sixth main way valve, a seventh main way valve, an eighth main way valve, a ninth main way valve and a tenth main way valve;
each waste heat recovery heat exchanger in the high-energy water waste heat recovery heat exchanger group further comprises a heat absorption side;
the first main valve is arranged on a connecting pipeline between the fine treatment device and the heat absorption side of the first waste heat recovery heat exchanger and is used for controlling the transportation of condensate water;
the second main valve is arranged on a connecting pipeline between the heat absorption side of the first waste heat recovery heat exchanger and the first low-pressure heater and is used for controlling the transportation of condensate water;
the third main path valve is arranged on a connecting pipeline between the first low-pressure heater and the heat absorption side of the second waste heat recovery heat exchanger and is used for controlling the conveying of condensate water;
the fourth main valve is arranged on a connecting pipeline between the heat absorption side of the second waste heat recovery heat exchanger and the second low-pressure heater and is used for controlling the transportation of condensate water;
The fifth main path valve is arranged on a connecting pipeline between the second low-pressure heater and the heat absorption side of the third waste heat recovery heat exchanger and is used for controlling the conveying of condensate water;
the sixth main path valve is arranged on a connecting pipeline between the heat absorption side of the third waste heat recovery heat exchanger and the third low-pressure heater and is used for controlling the transportation of condensate water;
the seventh main path valve is arranged on a connecting pipeline between the third low-pressure heater and the heat absorption side of the fourth waste heat recovery heat exchanger and is used for controlling the conveying of condensate water;
the eighth main path valve is arranged on a connecting pipeline between the heat absorption side of the fourth waste heat recovery heat exchanger and the fourth low-pressure heater and is used for controlling the conveying of condensate water;
the ninth main path valve is arranged on a connecting pipeline between the fourth low-pressure heater and the heat absorption side of the fifth waste heat recovery heat exchanger and is used for controlling the conveying of condensate water;
the tenth main path valve is arranged on a connecting pipeline between the heat absorption side of the fifth waste heat recovery heat exchanger and the deaerator and is used for controlling the conveying of condensate water.
2. The heat recovery system of claim 1, wherein the system further comprises: a boiler drain pump and a drain outlet valve; the atmospheric expansion device is connected with the high-energy water waste heat recovery heat exchanger group through the boiler drain pump;
The boiler drain pump provides drain power for conveying the high-energy water;
the drain outlet valve is arranged on a connecting pipeline between the boiler drain pump and the high-energy water waste heat recovery heat exchanger group and used for controlling the transportation of high-energy water.
3. The heat recovery system of claim 1, wherein the condenser is connected to the finishing device;
the fine treatment device is used for carrying out fine treatment on the condensed water released by the condenser and releasing the condensed water after the fine treatment.
4. The heat recovery system of claim 1, wherein the system further comprises: a condensate pump; the condenser is connected with the fine treatment device through the condensate pump;
the condensate pump provides power for conveying the condensate.
5. A method of heat recovery, the method comprising:
when the boiler is in wet state operation, controlling the atmospheric expansion vessel to release high-energy water, so that the high-energy water enters the high-energy water waste heat recovery heat exchanger group to enable the high-energy water waste heat recovery heat exchanger group to carry out waste heat recovery on the high-energy water, and releasing the cooled drain water to enable the drain water to enter the condenser to enable the condenser to condense the drain water into condensed water;
The fine treatment device is connected with a low-pressure regenerative heater group, and the low-pressure regenerative heater group is connected with a deaerator;
the low-pressure regenerative heater group is used for heating the refined condensate water and conveying the heated condensate water to the deaerator through a connecting pipeline so as to deoxidize the heated condensate water by the deaerator;
the high-energy water waste heat recovery heat exchanger group comprises a first waste heat recovery heat exchanger, a second waste heat recovery heat exchanger, a third waste heat recovery heat exchanger, a fourth waste heat recovery heat exchanger and a fifth waste heat recovery heat exchanger;
the bypass valve group comprises a first bypass valve, a second bypass valve, a third bypass valve, a fourth bypass valve and a fifth bypass valve;
the low-pressure regenerative heater group comprises a first low-pressure heater, a second low-pressure heater, a third low-pressure heater and a fourth low-pressure heater;
the first bypass valve is arranged on a connecting pipeline of the fine treatment device and the first low-pressure heater and is used for controlling the conveying of condensed water;
the second bypass valve is arranged on a connecting pipeline between the first low-pressure heater and the second low-pressure heater and is used for controlling the transportation of condensed water;
The third bypass valve is arranged on a connecting pipeline between the second low-pressure heater and the third low-pressure heater and is used for controlling the transportation of condensed water;
the fourth bypass valve is arranged on a connecting pipeline between the third low-pressure heater and the fourth low-pressure heater and is used for controlling the transportation of condensed water;
the fifth bypass valve is arranged on a connecting pipeline between the fourth low-pressure heater and the deaerator and is used for controlling the transportation of condensed water;
the high-energy water waste heat recovery heat exchanger group comprises a first waste heat recovery heat exchanger, a second waste heat recovery heat exchanger, a third waste heat recovery heat exchanger, a fourth waste heat recovery heat exchanger and a fifth waste heat recovery heat exchanger, and each waste heat recovery heat exchanger in the high-energy water waste heat recovery heat exchanger group comprises a heat release side;
the boiler drain pump is connected with the heat release side of the first waste heat recovery heat exchanger;
the heat release side of the first waste heat recovery heat exchanger is connected with the heat release side of the second waste heat recovery heat exchanger;
the heat release side of the second waste heat recovery heat exchanger is connected with the heat release side of the third waste heat recovery heat exchanger;
the heat release side of the third waste heat recovery heat exchanger is connected with the heat release side of the fourth waste heat recovery heat exchanger;
The heat release side of the fourth waste heat recovery heat exchanger is connected with the heat release side of the fifth waste heat recovery heat exchanger;
the heat release side of the fifth waste heat recovery heat exchanger is connected with the condenser;
each waste heat recovery heat exchanger in the high-energy water waste heat recovery heat exchanger group further comprises a heat absorption side;
the first main valve of the main valve group is arranged on a connecting pipeline between the fine treatment device and the heat absorption side of the first waste heat recovery heat exchanger and is used for controlling the transportation of condensed water;
the second main valve of the main valve group is arranged on a connecting pipeline between the heat absorption side of the first waste heat recovery heat exchanger and the first low-pressure heater and used for controlling the transportation of condensate water;
the third main valve of the main valve group is arranged on a connecting pipeline between the first low-pressure heater and the heat absorption side of the second waste heat recovery heat exchanger and is used for controlling the transportation of condensate water;
a fourth main valve of the main valve group is arranged on a connecting pipeline between the heat absorption side of the second waste heat recovery heat exchanger and the second low-pressure heater and used for controlling the transportation of condensate water;
a fifth main valve of the main valve group is arranged on a connecting pipeline between the second low-pressure heater and the heat absorption side of the third waste heat recovery heat exchanger and is used for controlling the transportation of condensate water;
A sixth main valve of the main valve group is arranged on a connecting pipeline between the heat absorption side of the third waste heat recovery heat exchanger and the third low-pressure heater and used for controlling the transportation of condensate water;
a seventh main valve of the main valve group is arranged on a connecting pipeline between the third low-pressure heater and the heat absorption side of the fourth waste heat recovery heat exchanger and used for controlling the transportation of condensate water;
an eighth main valve of the main valve group is arranged on a connecting pipeline between the heat absorption side of the fourth waste heat recovery heat exchanger and the fourth low-pressure heater and used for controlling the transportation of condensate water;
a ninth main valve of the main valve group is arranged on a connecting pipeline between the fourth low-pressure heater and the heat absorption side of the fifth waste heat recovery heat exchanger and is used for controlling the transportation of condensate water;
and a tenth main valve of the main valve group is arranged on a connecting pipeline between the heat absorption side of the fifth waste heat recovery heat exchanger and the deaerator and is used for controlling the transportation of the condensate water.
6. The heat recovery method of claim 5, wherein controlling the atmospheric flash vessel to release high energy water such that the high energy water enters a high energy water waste heat recovery heat exchanger bank comprises:
And controlling the opening of a drain outlet valve to enable the high-energy water released by the atmospheric expansion vessel to enter the high-energy water waste heat recovery heat exchanger group.
7. The heat recovery method of claim 5, further comprising:
when the boiler is in wet state, the main path valve group is controlled to be opened, the bypass valve group is closed, so that the condensate water released from the condenser enters the fine treatment device for fine treatment, and the condensate water after the fine treatment is heated by the low-pressure backheating heater group and the high-energy water waste heat recovery heat exchanger group and is conveyed to the deaerator.
8. The heat recovery method of claim 5, further comprising:
when the boiler is in dry state, the drain pump and the main valve group of the boiler are controlled to be closed, and the bypass valve group is opened, so that the condensate released from the condenser enters the fine treatment device for fine treatment, and the condensate after the fine treatment is heated by the low-pressure regenerative heater group and is conveyed to the deaerator.
9. A heat recovery device, the device comprising:
the release unit is used for controlling the atmospheric expansion vessel to release high-energy water when the boiler is in wet running, so that the high-energy water enters the high-energy water waste heat recovery heat exchanger group to carry out waste heat recovery on the high-energy water by the high-energy water waste heat recovery heat exchanger group, and releasing the cooled drain water, so that the drain water enters the condenser to be condensed into condensed water by the condenser;
The fine treatment device is connected with a low-pressure regenerative heater group, and the low-pressure regenerative heater group is connected with a deaerator;
the low-pressure regenerative heater group is used for heating the refined condensate water and conveying the heated condensate water to the deaerator through a connecting pipeline so as to deoxidize the heated condensate water by the deaerator;
the high-energy water waste heat recovery heat exchanger group comprises a first waste heat recovery heat exchanger, a second waste heat recovery heat exchanger, a third waste heat recovery heat exchanger, a fourth waste heat recovery heat exchanger and a fifth waste heat recovery heat exchanger;
the bypass valve group comprises a first bypass valve, a second bypass valve, a third bypass valve, a fourth bypass valve and a fifth bypass valve;
the low-pressure regenerative heater group comprises a first low-pressure heater, a second low-pressure heater, a third low-pressure heater and a fourth low-pressure heater;
the first bypass valve is arranged on a connecting pipeline of the fine treatment device and the first low-pressure heater and is used for controlling the conveying of condensed water;
the second bypass valve is arranged on a connecting pipeline between the first low-pressure heater and the second low-pressure heater and is used for controlling the transportation of condensed water;
The third bypass valve is arranged on a connecting pipeline between the second low-pressure heater and the third low-pressure heater and is used for controlling the transportation of condensed water;
the fourth bypass valve is arranged on a connecting pipeline between the third low-pressure heater and the fourth low-pressure heater and is used for controlling the transportation of condensed water;
the fifth bypass valve is arranged on a connecting pipeline between the fourth low-pressure heater and the deaerator and is used for controlling the transportation of condensed water;
the high-energy water waste heat recovery heat exchanger group comprises a first waste heat recovery heat exchanger, a second waste heat recovery heat exchanger, a third waste heat recovery heat exchanger, a fourth waste heat recovery heat exchanger and a fifth waste heat recovery heat exchanger, and each waste heat recovery heat exchanger in the high-energy water waste heat recovery heat exchanger group comprises a heat release side;
the boiler drain pump is connected with the heat release side of the first waste heat recovery heat exchanger;
the heat release side of the first waste heat recovery heat exchanger is connected with the heat release side of the second waste heat recovery heat exchanger;
the heat release side of the second waste heat recovery heat exchanger is connected with the heat release side of the third waste heat recovery heat exchanger;
the heat release side of the third waste heat recovery heat exchanger is connected with the heat release side of the fourth waste heat recovery heat exchanger;
The heat release side of the fourth waste heat recovery heat exchanger is connected with the heat release side of the fifth waste heat recovery heat exchanger;
the heat release side of the fifth waste heat recovery heat exchanger is connected with the condenser;
each waste heat recovery heat exchanger in the high-energy water waste heat recovery heat exchanger group further comprises a heat absorption side;
the first main valve of the main valve group is arranged on a connecting pipeline between the fine treatment device and the heat absorption side of the first waste heat recovery heat exchanger and is used for controlling the transportation of condensed water;
the second main valve of the main valve group is arranged on a connecting pipeline between the heat absorption side of the first waste heat recovery heat exchanger and the first low-pressure heater and used for controlling the transportation of condensate water;
the third main valve of the main valve group is arranged on a connecting pipeline between the first low-pressure heater and the heat absorption side of the second waste heat recovery heat exchanger and is used for controlling the transportation of condensate water;
a fourth main valve of the main valve group is arranged on a connecting pipeline between the heat absorption side of the second waste heat recovery heat exchanger and the second low-pressure heater and used for controlling the transportation of condensate water;
a fifth main valve of the main valve group is arranged on a connecting pipeline between the second low-pressure heater and the heat absorption side of the third waste heat recovery heat exchanger and is used for controlling the transportation of condensate water;
A sixth main valve of the main valve group is arranged on a connecting pipeline between the heat absorption side of the third waste heat recovery heat exchanger and the third low-pressure heater and used for controlling the transportation of condensate water;
a seventh main valve of the main valve group is arranged on a connecting pipeline between the third low-pressure heater and the heat absorption side of the fourth waste heat recovery heat exchanger and used for controlling the transportation of condensate water;
an eighth main valve of the main valve group is arranged on a connecting pipeline between the heat absorption side of the fourth waste heat recovery heat exchanger and the fourth low-pressure heater and used for controlling the transportation of condensate water;
a ninth main valve of the main valve group is arranged on a connecting pipeline between the fourth low-pressure heater and the heat absorption side of the fifth waste heat recovery heat exchanger and is used for controlling the transportation of condensate water;
and a tenth main valve of the main valve group is arranged on a connecting pipeline between the heat absorption side of the fifth waste heat recovery heat exchanger and the deaerator and is used for controlling the transportation of the condensate water.
10. A computer readable medium on which a computer program is stored, characterized in that the program, when executed by a processor, implements the heat recovery method according to any one of claims 5 to 8.
11. A computer device comprising a memory for storing information including program instructions and a processor for controlling execution of the program instructions, wherein the program instructions when loaded and executed by the processor implement the heat recovery method of any one of claims 5 to 8.
CN202210227607.8A 2022-03-08 2022-03-08 Heat recovery system, method and device Active CN114754350B (en)

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