CN111854473B - Energy recycling process applied to boiler - Google Patents
Energy recycling process applied to boiler Download PDFInfo
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- CN111854473B CN111854473B CN202010762443.XA CN202010762443A CN111854473B CN 111854473 B CN111854473 B CN 111854473B CN 202010762443 A CN202010762443 A CN 202010762443A CN 111854473 B CN111854473 B CN 111854473B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/08—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being otherwise bent, e.g. in a serpentine or zig-zag
- F28D7/082—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being otherwise bent, e.g. in a serpentine or zig-zag with serpentine or zig-zag configuration
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/10—Collecting-tanks; Equalising-tanks for regulating the run-off; Laying-up basins
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/02—Energy absorbers; Noise absorbers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B31/00—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus
- F22B31/08—Installation of heat-exchange apparatus or of means in boilers for heating air supplied for combustion
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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
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- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The application relates to the technical field of energy conservation and environmental protection, and discloses an energy recycling process applied to a boiler, which comprises the following processes: the first process is as follows: constructing a steam waste heat recycling system; and a second process: recovering waste heat steam and reducing noise: collecting the waste heat steam into two waste heat steam recovery and collecting pipelines, and performing noise reduction treatment; the third process: utilization of waste heat steam: conveying the waste heat steam to a primary waste heat water collecting tank through a first waste heat steam recovery pipeline to obtain high-temperature hot water with the temperature of more than 95 ℃, and then conveying the high-temperature hot water to a boiler; and delivering the waste heat steam to the slurry tank and the pre-curing chamber through a second waste heat steam recovery pipeline. This application is retrieved waste heat steam, has reduced the waste of the energy, gets up waste heat steam's heat energy make full use of, and energy-conserving benefit is showing to can accomplish the improvement of noise at waste heat steam recovery in-process, the noise falls to below 45 decibels, and the noise treatment effect is showing very much.
Description
Technical Field
The invention belongs to the technical field of energy conservation and environmental protection.
Background
With the continuous improvement of the requirement of China on the heat insulation performance of the building structure, the using amount of the aerated concrete block with good heat insulation performance is rapidly increased, and the production enterprises and the production scale are also rapidly increased. However, due to the limitation of factors such as design, process, management and technical level, most of the aerated concrete block enterprises in China currently form 0.4-0.6MPa/cm under the regulation of a valve control switch of a cylinder-separating pipeline after autoclaved curing of the aerated concrete blocks3The waste heat steam is directly discharged into the atmosphere, the waste heat steam is seriously wasted, and the noise is very high when the waste heat steam is discharged, so that the noise pollution is caused.
Disclosure of Invention
The invention aims to provide an energy recycling process applied to a boiler, and aims to solve the problems of waste heat waste and noise pollution caused by direct discharge of waste heat steam of the existing still kettle.
In order to achieve the above object, the basic scheme of the present invention provides an energy recycling process applied to a boiler, comprising the following processes:
the first process is as follows: constructing a steam waste heat recycling system, wherein the steam waste heat recycling system comprises a primary waste heat collecting tank, a precuring chamber, a slurry tank, a middle steam exhaust pipeline arranged in the middle of the still kettle and a bottom pipeline arranged at the bottom of the still kettle, and the middle steam exhaust pipelines of all the still kettles are connected with a silencing steam exhaust pipeline; the bottom pipeline is provided with a steam exhaust outlet, the steam exhaust outlets of all the still kettles are communicated with a water-drainage steam exhaust pipeline, two ends of the water-drainage steam exhaust pipeline and two ends of the noise elimination steam exhaust pipeline are provided with silencers, and the water-drainage steam exhaust pipeline and the noise elimination steam exhaust pipeline which are positioned on the same side are communicated with a waste heat steam recovery collecting pipeline;
a first heat exchanger is arranged in the primary waste heat collecting tank, and a pipeline heat absorption and release facility is arranged in the pre-curing chamber; a first waste heat steam recovery pipeline control valve is arranged at the end part of one waste heat steam recovery manifold and communicated with a first waste heat steam recovery pipeline, and the first waste heat steam recovery pipeline is communicated with a first heat exchanger in the primary waste heat water collecting tank; a water outlet of the primary waste heat collecting tank is provided with a circulating pump which is communicated with the boiler through a pipeline; a second waste heat steam recovery pipeline control valve is arranged at the end part of the other waste heat steam recovery collecting pipeline and communicated with a second waste heat steam recovery pipeline, and the second waste heat steam recovery pipeline is simultaneously communicated with the slurry tank and a heat absorption and release facility of the pipeline of the pre-curing chamber;
and a second process: recovering waste heat steam and reducing noise: waste heat steam is collected into two waste heat steam recovery and convergence pipelines through a drainage steam exhaust pipeline and a silencing steam exhaust pipeline, and noise reduction treatment is carried out by utilizing silencers at two ends of the drainage steam exhaust pipeline and at two ends of the silencing steam exhaust pipeline in the waste heat steam recovery process;
the third process: utilization of waste heat steam: conveying waste heat steam to a primary waste heat water collecting tank through a first waste heat steam recovery pipeline, conducting heat exchange by a first heat exchanger, heating water in the primary waste heat water collecting tank to obtain high-temperature hot water with the temperature of more than 95 ℃, sending the high-temperature hot water in the primary waste heat water collecting tank back to a boiler through a circulating pump, heating the high-temperature hot water by the boiler to obtain steam with required pressure, and recycling the steam to a still kettle;
introducing part of waste heat steam into the pre-curing chamber through a second waste heat steam recovery pipeline, and pre-curing the semi-finished aerated concrete block in the pre-curing chamber through a pipeline heat absorption and release facility of the pre-curing chamber, wherein the pre-curing temperature is 40-60 ℃; and the other part of the waste heat steam is directly introduced into the slurry tank to be mixed with the material and heated to 40-50 ℃, so that the material mixing is completed.
The principle and the beneficial effect of the basic scheme are as follows:
traditional aerated concrete is in the production process, directly discharges the high temperature steam of discharging in the still kettle to the air, has caused waste heat steam heat energy's waste on the one hand, and on the other hand, steam can adsorb more dust in aerial condensation process for aerial many suspended particles that form cause environmental pollution.
In the scheme:
(1) in the aspects of waste heat recovery and energy-saving benefits, the steam is recovered through the waste heat steam recovery collecting pipeline, the steam recovery rate reaches more than 80%, and people can conveniently utilize the heat of the waste heat steam; through the first waste heat steam recovery pipeline and the second waste heat steam recovery pipeline, waste heat steam can be respectively conveyed to the primary waste heat collecting tank, the pre-curing chamber and the slurry tank, water in the primary waste heat collecting tank is heated to be more than 95 ℃ by utilizing the heat of the waste heat steam, constant-temperature pre-curing is carried out on the semi-finished aerated concrete block in the pre-curing chamber, the slurry tank is heated, the recovered waste heat steam is utilized, the waste of energy is reduced, energy required by constant-temperature pre-curing of the pre-curing chamber, temperature rising of the slurry tank and heating of the primary waste heat collecting tank is saved, economic cost is saved, and energy-saving benefits are remarkable.
(2) In the aspect of noise control, in a traditional aerated concrete production system, 2 silencers are installed at a steam outlet of a still kettle, if 6 still kettles need 12 silencers, the noise during steam emission is still more than 80 decibels, great interference is caused to workers and surrounding residents, and the workers can work only by wearing earplugs. The scheme is that the silencers are arranged at two ends of the drainage steam exhaust pipeline and two ends of the silencing steam exhaust pipeline, the whole waste heat steam recovery system only needs 4 silencers, the cost is reduced, waste heat steam completes the noise treatment in the recovery process, the noise is reduced to be below 45 decibels, and the noise treatment effect is very obvious.
(3) In the aspect of operation safety, the bottom steam exhaust of the traditional still kettle directly discharges 146 ℃ high-temperature waste heat steam into the air, the pressure during the discharge of the waste heat steam is very high, the waste heat steam can be sprayed for tens of meters, the impact force is very large, the temperature is very high, and workers are easily burnt if contacting the waste heat steam, so that great potential safety hazards exist. And this scheme is through gathering and retrieving waste heat steam, the potential safety hazard that exists when both having solved waste heat steam and discharging can absorb, administer the noise again, can also reduce the waste of the energy.
(4) In the aspect of environmental pollution treatment, high-temperature steam discharged from the still kettle is recycled, so that the high-temperature steam is not directly discharged into the air any more, the content of suspended particles in the air can be reduced, and pollution treatment is realized.
(5) In the aspects of production efficiency and product quality, high-temperature hot water in the primary waste heat collecting tank heated by waste heat steam is conveyed to the boiler, so that the time required by boiler water heating is shortened, the yield of products is greatly improved, and the energy-saving benefit is more than 30%. Meanwhile, the semi-finished product of the aerated concrete block is pre-cured by utilizing the waste heat steam, and the slurry tank is heated and mixed, so that the product quality of the autoclaved aerated concrete block can be improved.
Optionally, the method further comprises a waste heat steam recycling process of the primary waste heat collecting tank: a second-stage waste heat collecting tank is arranged in the steam waste heat recycling system, and a second heat exchanger is arranged in the second-stage waste heat collecting tank; the first-stage waste heat collecting pool is provided with a first waste steam pipeline communicated with the first heat exchanger, and the first waste steam pipeline is communicated with a second heat exchanger in the second-stage waste heat collecting pool; a water outlet of the secondary waste heat collecting tank is also provided with a circulating pump which is communicated with the primary waste heat collecting tank through a pipeline; the waste heat steam led into the second heat exchanger is utilized to heat the water in the secondary waste heat water collecting tank to form hot water with the temperature being higher than 35 ℃, and the hot water in the secondary waste heat water collecting tank is conveyed into the primary waste heat water collecting tank by the circulating pump.
After the heat exchange of the waste heat steam is completed in the primary waste heat collecting tank, the waste heat steam is discharged from the first waste steam pipeline, the waste heat steam still has certain heat, and if the waste heat steam is directly discharged, larger energy waste can still be caused. This scheme is through setting up the second grade waste heat catch basin, carry out further waste heat utilization to the exhaust waste heat steam from first heat exchanger, heat the water in the second grade waste heat catch basin more than 35 ℃, then go into the one-level waste heat catch basin with the water pump after the heating again, practiced thrift the part and heated the water in the one-level waste heat catch basin to the energy that consumes more than 95 ℃, the water heating in the one-level waste heat catch basin has also been shortened simultaneously and has been reached required time more than 95 ℃, waste heat steam's utilization ratio has been improved.
Optionally, the method further comprises a waste heat steam recycling process of the pre-curing chamber: and a second residual steam pipeline is arranged in the pre-curing chamber, and the residual heat steam in the second residual steam pipeline is merged with the residual heat steam in the first residual steam pipeline and then introduced into a second heat exchanger in the secondary residual heat water collecting tank to heat the water in the secondary residual heat water collecting tank together.
The waste heat steam discharged from the pre-curing chamber still has certain heat, and if the waste heat steam is directly discharged, larger energy waste is caused. According to the scheme, the part of waste heat steam is introduced into the second heat exchanger of the secondary waste heat collecting tank, the waste heat of the part of steam is further utilized, the utilization rate of the waste heat steam is improved, and meanwhile, the time for heating the water in the waste heat collecting tank to more than 95 ℃ is further shortened.
Optionally, the method further comprises a waste heat steam recycling process of the secondary waste heat collecting tank: a residual water and residual steam pipeline is arranged in the secondary waste heat collecting tank, one end of the residual water and residual steam pipeline is communicated with the second heat exchanger, and the other end of the residual water and residual steam pipeline is communicated with a steam-water recovery tank; and recovering the waste heat steam discharged by the second heat exchanger into a steam-water recovery tank by using a waste water and waste steam pipeline.
The heat of the steam discharged from the secondary waste heat collecting tank is basically used up, so that the waste steam discharged from the second waste steam pipeline is basically condensed into water, and the part of the waste steam and the water can be recycled into the steam-water recycling tank so as to be reused, and the energy is saved.
Optionally, the method further comprises a residual water and residual steam recycling process of the steam-water recovery tank: and introducing residual water and residual steam in the steam-water recovery tank into the slurry tank, and mixing the residual water and the residual steam with the materials to raise the temperature.
The residual water and the residual steam in the steam-water recovery tank still have certain heat, and the materials in the slurry tank need to be added with water and heated in the stirring and mixing process. This scheme lets in the surplus water vapor in the soda recovery pond to the sizing agent pond, and with the material mixture intensifies, has realized the reuse of surplus water vapor in the soda recovery pond, has reduced the waste of the energy, has saved the economic cost who adds water, intensifies with the sizing agent pond.
Optionally, the first heat exchanger and the second heat exchanger are both coil-type spiral fin radiators.
The coiled pipe type spiral fin radiator is adopted to exchange heat of waste heat steam entering the primary waste heat collecting tank and waste heat steam entering the secondary waste heat collecting tank, the heat absorption and radiation areas are large, the heat exchange efficiency is high, and heat exchange can be better carried out on the waste heat steam.
Optionally, the secondary waste heat collecting tank is further provided with an overflow pipe, a blow-off pipe and a thermometer.
In the secondary waste heat collecting tank, if the water level is too high or steam is generated, the water or the steam can be discharged from the overflow pipe and enter the steam-water recovery tank. After a certain period of use, the secondary waste heat collecting tank can generate certain sediments which can be discharged through a drain pipe. The temperature in the second grade waste heat collecting tank can be conveniently known by an operator in time due to the arrangement of the thermometer.
Optionally, the pipeline heat absorption and release facility of the pre-curing chamber comprises a snakelike finned tube radiator, a plate type multi-tube finned radiator, a flow control valve and a drain valve, and the steam flow in the pre-curing chamber is adjusted through the flow control valve to reach the optimal curing temperature required by each section and position of the pre-curing chamber.
Through snakelike finned tube radiator, board-like multitube fin radiator, can utilize waste heat steam's heat to carry out the constant temperature to the aerated concrete block semi-manufactured goods in the room of procuring in advance and procuring to through trap with the comdenstion water discharge and the concentrated recovery that produce in the pipeline.
When the steam pressure of the waste heat steam discharged from the outlet of the still kettle is more than or equal to 0.5MPa/cm3When the temperature is about 146 ℃, if the residual heat steam is directly conveyed into the pre-curing chamber, even if partial heat is lost in the process of conveying the residual heat steam, the temperature of the residual heat steam conveyed into the pre-curing chamber is still higher. In this case, the semi-finished product of the aerated concrete block in the pre-curing chamber may crack due to the over-high temperature, which affects the quality of the product. The steam flow in the precuring chamber is adjusted through the flow control valve, so that the sections and the intervals of the precuring chamber reach the required optimal curing temperature, the operation is convenient, the precuring effect of the semi-finished aerated concrete block can be improved, and the product quality is ensured.
Optionally, the bottom pipeline of the still kettle is further provided with a water drainage outlet, the water drainage outlets of all the still kettles are communicated with a water drainage pipeline, and the water drainage pipeline is connected with a water drainage collecting tank.
By the design, water discharged by the drain valve can be recycled, and the waste of resources is reduced.
Optionally, a heat insulation layer is arranged outside the primary waste heat collecting tank, and an overtemperature self-exhaust steam pipeline is arranged at the top of the primary waste heat collecting tank; a thermometer and a water level gauge are also arranged on the first-stage waste heat collecting tank.
The heat preservation can play better heat preservation effect to one-level waste heat catch basin, can reduce the calorific loss of waste heat steam.
The overtemperature self-exhaust steam pipeline is arranged at the top of the primary waste heat collecting tank, so that the primary waste heat collecting tank is always in a non-pressure state. When the water temperature exceeds the upper limit (namely is more than or equal to 95 ℃), an operator can be reminded to timely control the on-off of the residual steam pipeline control valve so as to adjust the steam flow, thereby adjusting the intensity of heat exchange, ensuring the use safety of facilities and avoiding over-temperature and over-pressure.
A thermometer and a water level gauge are arranged in the primary waste heat collecting tank, so that an operator can know the water temperature and the water level in the primary waste heat collecting tank conveniently in time.
Drawings
FIG. 1 is a flow chart of a steam waste heat recovery system according to the present invention;
FIG. 2 is a schematic view of a top view structural layout of the steam waste heat recycling system of the present invention;
FIG. 3 is a schematic front structural view of the connection of the still kettle with a steam exhaust pipeline and a silencing steam exhaust pipeline;
FIG. 4 is a schematic position diagram of an economizer, a boiler and a primary waste heat collecting tank;
FIG. 5 is a schematic structural diagram of the primary afterheat collecting tank in FIG. 2;
FIG. 6 is a front cross-sectional view of FIG. 5;
FIG. 7 is a left side cross-sectional view of FIG. 5;
FIG. 8 is a formal cross-sectional view of the secondary waste heat collection basin of FIG. 2;
FIG. 9 is a schematic view of the structure of the pre-curing chamber.
Detailed Description
The following is further detailed by way of specific embodiments:
reference numerals in the drawings of the specification include: a boiler 1, a steam-distributing cylinder and valve control switch 2, a still kettle 3, a waste heat steam recovery header pipeline 4, a drainage steam exhaust pipeline 5, a silencing steam exhaust pipeline 6, a silencer 7, a first waste heat steam recovery pipeline 8, a primary waste heat collecting tank 9, a heat-insulating layer 10, an overtemperature self-steam exhaust pipeline 11, a thermometer 12, a water level meter 13, a movable sealing cover 14, a ladder stand 15, a first heat exchanger 16, a steam-water recovery tank 17, a second waste heat steam recovery pipeline 18, a pre-curing chamber 19, a snakelike finned tube radiator 20, a plate type multi-tube finned tube radiator 21, a drain valve 23, a slurry tank 24, a secondary waste heat collecting tank 25, a second heat exchanger 26, an overflow pipe 27, a blow-off pipe 28, a first waste steam pipeline 29, a second waste steam pipeline 30, a waste water and waste steam pipeline 31, a first waste heat steam recovery pipeline control valve 32, a second waste heat steam recovery pipeline control valve 33, a safety valve steam exhaust, The device comprises a middle steam exhaust stop valve 35, a middle steam exhaust one-way valve 36, a steam-water bag 37, a drain valve 38, a drain pipe 39, a drain water collecting tank 40, a bottom steam exhaust valve 41 and an economizer 42.
Example 1
An energy recycling process applied to a boiler mainly comprises the following process steps:
the first process is as follows: and constructing a steam waste heat recycling system. The steam waste heat recycling system is mainly composed of a primary waste heat collecting tank 9, a secondary waste heat collecting tank 25, a pre-curing chamber 19, a slurry tank 24 and a steam-water recycling tank 17, and a steam inlet of a still kettle 3 is communicated with a boiler 1 through a pipeline, an air distributing cylinder and a valve control switch 2, as shown in the attached figure 2. The work flow diagram of the system is shown in figure 1.
As shown in the attached drawing 3, a safety valve steam exhaust device 34 is installed at the top of the still kettle 3 to prevent the overpressure phenomenon in the still kettle and ensure the safety of the still kettle. The middle part of still kettle 3 is connected with middle part exhaust steam pipe, installs middle part exhaust steam stop valve 35 and middle part exhaust steam check valve 36 on the middle part exhaust steam pipe, avoids the waste heat steam refluence. The middle steam exhaust pipelines of all the still kettles 3 are connected with a silencing steam exhaust pipeline 6, and silencers 7 are arranged at two ends of the silencing steam exhaust pipeline 6.
The bottom of the still kettle 3 is communicated with a bottom pipeline, a steam water bag 37 is arranged on the bottom pipeline, the bottom pipeline is provided with a drainage outlet and a steam exhaust outlet, a drain valve 38 is arranged in the drainage outlet, the drainage outlets of all the still kettles 3 are communicated with a drainage pipeline 39, and the drainage pipeline 39 is introduced into a drainage water collecting tank 40 to recycle the water; the steam outlet is provided with a bottom steam exhaust valve 41, and the steam outlets of all the autoclaves 3 are communicated with a steam drainage and exhaust pipeline 5. The two ends of the steam drainage and exhaust pipeline 5 are both provided with a silencer 7, one end of the steam drainage and exhaust pipeline 5 and the end part of the silencing and exhaust pipeline 6 at the same side are both communicated with a waste heat steam recovery and collection pipeline 4, and the other end of the steam drainage and exhaust pipeline 5 and the end part of the silencing and exhaust pipeline 6 at the same side are also both communicated with a waste heat steam recovery and collection pipeline 4.
Referring to fig. 6 and 7, a first heat exchanger 16 is mounted on the inner wall of the primary waste heat collecting tank 9, and the first heat exchanger 16 is a coiled spiral fin radiator made of SUS 304. A first waste heat steam recovery pipeline control valve 32 is installed at the end part of one of the waste heat steam recovery collecting pipelines 4 and communicated with a first waste heat steam recovery pipeline 8, and a first waste heat steam recovery pipeline 18 is communicated with a first heat exchanger 16 in a primary waste heat collecting tank 9; and a water outlet of the primary waste heat collecting tank 9 is provided with a circulating pump which is communicated with the boiler 1 through a pipeline. In this embodiment, the circulating pump is a high temperature resistant feed pump, such as a high temperature resistant vertical stainless steel multistage centrifugal pump, which meets the feed pressure and flow rate of the boiler 1.
A second waste heat steam recovery pipeline control valve 33 is arranged at the end part of the other waste heat steam recovery collecting pipeline 4 and is communicated with a second waste heat steam recovery pipeline 18, and the second waste heat steam recovery pipeline 18 is simultaneously communicated with the slurry tank 24 and heat absorption and release facilities of the pipelines of the pre-curing chamber 19. The pipeline heat absorption and release facilities of the pre-curing chamber 19 are communicated with each other and comprise a snakelike finned tube radiator 20, a plate type multi-tube finned radiator 21, a drain valve 23 and a flow control valve for regulating the steam flow in the pre-curing chamber. Referring to FIG. 9, a serpentine finned tube radiator 20 is mounted on one of the inside faces of the chamber 19 and a plate type multi-tube finned radiator 21 is mounted on the other inside face of the chamber 19. The bottom of the pre-curing chamber 19 is provided with a drain valve 23, and all the drain valves 23 are connected with a drain valve 23 connecting pipeline together and used for discharging condensed water in the pipeline. The pre-curing chamber 19 realizes heat exchange through a snakelike finned tube radiator 20 and a plate type multi-tube finned tube radiator 21, and pre-cures the semi-finished aerated concrete block in the pre-curing chamber 19 at a constant temperature of 40-60 ℃; and the condensed water generated in the pipeline is discharged through the drain valve 23 and is collected and recovered. If the temperature of the pre-curing chamber 19 is unbalanced, the semi-finished autoclaved aerated concrete is partially heated, and the semi-finished autoclaved aerated concrete is partially heated, or is not heated, so that the reaction speed is unbalanced, and the strength is not ensured. In the embodiment, the steam flow in the pre-curing chamber 19 is adjusted through the flow control valve to reach the optimal curing temperature required by each section of the pre-curing chamber 19, so that the quality of the semi-finished aerated concrete block is improved.
Wherein, the first-stage waste heat collecting tank 9 comprises a first tank body, heat preservation layers 10 are arranged on the periphery, the upper surface and the lower surface of the first-stage waste heat collecting tank 9, and the thickness of the heat preservation layers 10 is less than or equal to 100 mm. The heat-insulating layer 10 is a silicate heat-insulating layer 10. The heat preservation layer 10 can play a good heat preservation role in the primary waste heat collecting tank 9, and can reduce the heat loss of waste heat steam. The first heat exchanger 16 is installed on the inner wall of the first tank body and is communicated with the first waste heat steam recovery pipeline 8. Referring to fig. 5, a ladder 15 is arranged outside the primary waste heat collecting tank 9, and a movable sealing cover 14 is arranged at the top of the primary waste heat collecting tank for an operator to overhaul. The top of the first-stage waste heat collecting tank 9 is also provided with an overtemperature self-exhaust steam pipeline 11, when the water temperature exceeds the upper limit (namely is more than or equal to 95 ℃), an operator can be reminded to timely control the on-off of a waste steam pipeline control valve so as to adjust the steam flow, thereby adjusting the intensity of heat exchange, ensuring the use safety of facilities and preventing overtemperature and overpressure. A thermometer 12 and a water level gauge 13 are arranged in the primary waste heat collecting tank 9, so that an operator can observe the temperature and the water level in the primary waste heat collecting tank 9 conveniently.
Referring now to FIG. 9, a serpentine finned tube radiator 20 is mounted on one of the inside faces of the chamber 19 and a plate type multi-tube finned radiator 21 is mounted on the other inside face of the chamber 19. The bottom of the pre-curing chamber 19 is provided with a drain valve 23, and all the drain valves 23 are connected with a drain valve 23 connecting pipeline together and used for discharging condensed water in the pipeline.
And a second heat exchanger 26 is arranged on the inner wall of the secondary waste heat collecting tank 25, and the second heat exchanger 26 adopts a coiled spiral fin radiator made of SUS 304. The bottom of the primary waste heat collecting tank 9 is provided with a first waste steam pipeline 29 communicated with the output end of the first heat exchanger 16, the first waste steam pipeline 29 is led into the second heat exchanger 26 in the secondary waste heat collecting tank 25, a water outlet of the secondary waste heat collecting tank 25 is also provided with a circulating pump, and the circulating pump is communicated with the primary waste heat collecting tank 9 through a pipeline. The circulating pump adopts a high-temperature resistant water feeding pump. The pre-curing chamber 19 is provided with a second residual steam pipeline 30, and the second residual steam pipeline 30 and the first residual steam pipeline 29 are merged and then introduced into the second heat exchanger 26 in the secondary residual heat collecting tank 25.
The secondary waste heat collecting tank 25 includes a second tank body, and as shown in fig. 8, a second heat exchanger 26 is installed on an inner wall of the second tank body. A thermometer 12 and a water temperature meter are also arranged in the secondary waste heat collecting tank 25. In addition, an overflow pipe 27 and a drain pipe 28 are installed at the bottom of the secondary waste heat collecting tank 25, and if the water level in the secondary waste heat collecting tank 25 is too high or steam is generated, the water or the steam can be discharged from the overflow pipe 27 and enter the steam-water recovery tank 17. If the secondary waste heat collecting tank 25 is used for a certain period of time, sediment is generated and can be discharged through the sewage discharge pipe 28.
And a residual water and residual steam pipeline 31 is arranged at the bottom of the secondary waste heat collecting tank 25, one end of the residual water and residual steam pipeline 31 is communicated with the second heat exchanger 26, the other end of the residual water and residual steam pipeline 31 is communicated with a steam-water recovery tank 17, and the steam-water recovery tank 17 is communicated with the slurry tank 24.
And a second process: recovering waste heat steam and reducing noise: waste heat steam is collected into two waste heat steam recovery collecting pipelines 4 through a drainage steam exhaust pipeline 5 and a silencing steam exhaust pipeline 6, and in the waste heat steam recovery process, noise reduction treatment is carried out by utilizing silencers 7 at two ends of the drainage steam exhaust pipeline 5 and two ends of the silencing steam exhaust pipeline 6.
The third process: utilization of waste heat steam: the waste heat steam is conveyed to the first heat exchanger 16 in the primary waste heat collecting tank 9 through the first waste heat steam recovery pipeline 8, heat is conducted and exchanged through the first heat exchanger 16, water in the primary waste heat collecting tank 9 is heated, and high-temperature hot water with the temperature being higher than 95 ℃ can be obtained. Referring to fig. 4, the high-temperature hot water in the primary waste heat collecting tank 9 is sent to the economizer 42 of the boiler 1 by the circulating pump, and then sent back to the boiler 1 by the economizer 42, and heated by the boiler 1 to become steam with required pressure for recycling of the still kettle 3.
And a part of the waste heat steam conveyed by the second waste heat steam recovery pipeline 18 is introduced into the pre-curing chamber 19, heat exchange is realized through a snakelike finned tube radiator 20 and a plate type multi-tube finned tube radiator 21 of the pre-curing chamber 19, and the semi-finished aerated concrete block in the pre-curing chamber 19 is pre-cured at a constant temperature of 40-60 ℃. And the condensed water generated in the pipeline is discharged through the drain valve 23 and is collected and recovered. If the temperature of the pre-curing chamber 19 is unbalanced, the semi-finished autoclaved aerated concrete is partially heated, and the semi-finished autoclaved aerated concrete is partially heated, or is not heated, so that the reaction speed is unbalanced, and the strength is not ensured. In the embodiment, the steam flow in the pre-curing chamber 19 is adjusted through the flow control valve to reach the optimal curing temperature required by each section of the pre-curing chamber 19, so that the quality of the semi-finished aerated concrete block is improved.
The second waste heat steam recovery pipeline 18 conveys the other part of waste heat steam to directly enter the slurry tank 24 (water is needed during mixing in the slurry tank 24, and the temperature needs to be raised and mixed), and the waste heat steam is mixed with the material to be raised, wherein the temperature is 40-50 ℃, the chemical reaction speed of the material is accelerated, the material mixing efficiency is improved, and the energy-saving benefit is improved.
The process four is as follows: and (3) recycling waste heat steam of the primary waste heat collecting tank: the waste heat steam introduced into the second heat exchanger 26 is used for heating the water in the secondary waste heat collecting tank 25 to form hot water with the temperature being higher than 35 ℃, and the hot water in the secondary waste heat collecting tank 25 is sent into the primary waste heat collecting tank 9 by the circulating pump.
And a fifth process: and (3) recycling waste heat steam of the pre-curing chamber: the waste heat steam discharged from the pre-curing chamber 19 and the waste heat steam in the first waste steam pipeline 29 are combined in the second waste steam pipeline 30 and then are introduced into the second heat exchanger 26 in the secondary waste heat collecting tank 25, and the water in the secondary waste heat collecting tank 25 is heated together.
The process six: and (3) recycling waste heat steam of the secondary waste heat collecting tank: and recovering the waste heat steam discharged by the second heat exchanger 26 into the steam-water recovery tank 17 by using a waste water and waste steam pipeline 31.
The process is seven: and (3) recycling residual water and residual steam of the steam-water recovery tank: and introducing the residual water and the residual steam in the steam-water recovery tank 17 into the slurry tank 24, mixing with the materials and heating.
When the steam is discharged from the still kettles 3, the steam is discharged one by one, and the steam discharging time of one still kettle 3 is about 2 hours. The bottom steam discharge of the traditional still kettle 3 is to directly discharge high-temperature waste heat steam with the temperature of 146 ℃ into the air, the pressure during the discharge of the waste heat steam is very high, the waste heat steam can be sprayed for tens of meters, the impact force is very large, the temperature is very high, and workers can be easily burnt if contacting the waste heat steam, so that great potential safety hazards exist; and the noise during the discharge is very large, which is far more than 85 decibels, and causes great interference to workers and surrounding residents. And this embodiment is through gathering and retrieving waste heat steam, has both solved the potential safety hazard that exists when waste heat steam discharges, can absorb, administer the noise again, can also reduce the waste of the energy.
In this embodiment, since the temperature of the water sent into the boiler 1 from the primary waste heat collecting tank 9 is higher than 95 ℃, steam is generated at this time, if the water is pumped into the boiler 1 in a pumping manner, a phenomenon of virtual pumping (that is, the water cannot be pumped into the boiler 1) of the circulating pump may occur, and the water cannot be pumped into the boiler 1. In the embodiment, water is firstly sent into the energy saver 42 on the boiler 1 from the rear end of the circulating pump by using high pressure, and then sent into the boiler 1 by the energy saver 42, so that the phenomenon of virtual pumping of the circulating pump is avoided, and high-temperature hot water in the primary waste heat collecting tank 9 can be ensured to smoothly enter the boiler 1.
The process that this embodiment adopted, when in actual use, in the aspect of waste heat recovery utilization, through waste heat steam recovery collecting pipe 4, with steam recovery, and steam recovery rate has reached more than 80%, makes things convenient for people to utilize waste heat steam's heat. The method specifically comprises the following steps: through the first waste heat steam recovery pipeline 8 and the second waste heat steam recovery pipeline 18, waste heat steam can be respectively conveyed to the primary waste heat collecting tank 9, the pre-curing chamber 19 and the slurry tank 24, water in the primary waste heat collecting tank is heated to be more than 95 ℃ by utilizing the heat of the waste heat steam, constant-temperature pre-curing is carried out on the semi-finished aerated concrete block in the pre-curing chamber 19, the slurry tank 24 is heated, the recovered waste heat steam is utilized, the waste of energy is reduced, energy required by constant-temperature pre-curing of the pre-curing chamber 19, heating of the slurry tank 24 and heating of the primary waste heat collecting tank 9 is saved, and the economic cost is saved.
In terms of energy saving, taking a 6T/h gas boiler 1 as an example, the temperature of water added into the boiler 1 is 25 ℃ in the prior art (the water temperature is lower in winter), the boiler 1 heats the water at 25 ℃ to 100 ℃ to form steam, and in general, the steam is consumed for more than one hour, and at least 300m is consumed in the process3The market price of the fuel gas is about 3 yuan/m3. In the scheme, the water in the primary waste heat collecting tank 9 can be heated by utilizing the waste heat steam to form high-temperature hot water with the temperature being higher than 95 ℃, the high-temperature hot water can be directly added into the boiler 1, and the fuel gas consumed for heating the water in the boiler 1 from 25 ℃ to 95 ℃ is saved, so that the economic cost of more than 300 x 3 and 900 yuan is saved, the boiler 1 works for 12 hours a day, more than 1 million yuan can be saved in one day, millions can be saved in one year, and the energy-saving benefit is very obvious.
In the aspect of environmental management, high-temperature steam discharged from the still kettle 3 is recycled, so that the high-temperature steam is not directly discharged into the air any more, the content of suspended particles in the air can be reduced, and pollution management is realized.
In the noise control aspect, the noise generated by steam emission is more than 80 db, and workers need to wear earplugs to work. The silencer 7 is arranged at the two ends of the drainage steam exhaust pipeline 5 and the two ends of the silencing steam exhaust pipeline 6, the whole waste heat steam recovery system only needs 4 silencers 7, the cost is reduced, the waste heat steam completes the noise treatment in the recovery process, the noise is reduced to be below 45 decibels, and the noise treatment effect is very obvious.
In the aspects of production efficiency and product quality, only 8 kettles of aerated concrete blocks can be produced by one autoclave 3 a day before, 10-12 kettles can be produced by one autoclave 3 a day after the process is adopted, the yield of products is greatly improved, the process is a reasonable matched result, and the energy-saving benefit is more than 30%. Meanwhile, the semi-finished product of the aerated concrete block is pre-cured by using the waste heat steam, and the slurry tank 24 is heated and mixed, so that the product quality of the autoclaved aerated concrete block can be improved.
Example 2
The present embodiment is different from embodiment 1 in that: in this embodiment, still include the surplus water surplus vapour recycling process in soda recovery pond: a pipeline is also communicated between the steam-water recovery tank 17 and the slurry tank 24 and is used for introducing residual water and residual steam in the steam-water recovery tank 17 into the slurry tank 24 and mixing the residual water and the residual steam with materials for heating.
The residual water and the residual steam in the steam-water recovery tank 17 still have certain heat, and the materials in the slurry tank 24 need to be added with water and heated during stirring and mixing. The scheme leads the residual water and the residual steam in the steam-water recovery tank 17 into the slurry tank 24, and the residual water and the residual steam are mixed with the material to be heated, so that the residual water and the residual steam in the steam-water recovery tank 17 are reused, the energy waste is reduced, and the economic cost of adding water and heating the slurry tank 24 is saved.
The foregoing is merely an example of the present invention and common general knowledge of known specific structures and features of the embodiments is not described herein in any greater detail. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (10)
1. An energy recycling process applied to a boiler is characterized in that: the method comprises the following technical processes:
the first process is as follows: constructing a steam waste heat recycling system, wherein the steam waste heat recycling system comprises a primary waste heat collecting tank, a precuring chamber, a slurry tank, a middle steam exhaust pipeline arranged in the middle of the still kettle and a bottom pipeline arranged at the bottom of the still kettle, and the middle steam exhaust pipelines of all the still kettles are connected with a silencing steam exhaust pipeline; the bottom pipeline is provided with a steam exhaust outlet, the steam exhaust outlets of all the still kettles are communicated with a water-drainage steam exhaust pipeline, two ends of the water-drainage steam exhaust pipeline and two ends of the noise elimination steam exhaust pipeline are provided with silencers, and the water-drainage steam exhaust pipeline and the noise elimination steam exhaust pipeline which are positioned on the same side are communicated with a waste heat steam recovery collecting pipeline;
a first heat exchanger is arranged in the primary waste heat collecting tank, and a pipeline heat absorption and release facility is arranged in the pre-curing chamber; a first waste heat steam recovery pipeline control valve is arranged at the end part of one waste heat steam recovery collecting pipeline and communicated with a first waste heat steam recovery pipeline, and the first waste heat steam recovery pipeline is communicated with a first heat exchanger in the primary waste heat water collecting tank; a water outlet of the primary waste heat collecting tank is provided with a circulating pump which is communicated with the boiler through a pipeline; a second waste heat steam recovery pipeline control valve is arranged at the end part of the other waste heat steam recovery collecting pipeline and communicated with a second waste heat steam recovery pipeline, and the second waste heat steam recovery pipeline is simultaneously communicated with the slurry tank and a heat absorption and release facility of the pipeline of the pre-curing chamber;
and a second process: recovering waste heat steam and reducing noise: waste heat steam is collected into two waste heat steam recovery and convergence pipelines through a drainage steam exhaust pipeline and a silencing steam exhaust pipeline, and noise reduction treatment is carried out by utilizing silencers at two ends of the drainage steam exhaust pipeline and at two ends of the silencing steam exhaust pipeline in the waste heat steam recovery process;
the third process: utilization of waste heat steam: conveying waste heat steam to a primary waste heat water collecting tank through a first waste heat steam recovery pipeline, conducting heat exchange by a first heat exchanger, heating water in the primary waste heat water collecting tank to obtain high-temperature hot water with the temperature of more than 95 ℃, sending the high-temperature hot water in the primary waste heat water collecting tank back to a boiler through a circulating pump, heating the high-temperature hot water by the boiler to obtain steam with required pressure, and recycling the steam to a still kettle;
introducing part of waste heat steam into the pre-curing chamber through a second waste heat steam recovery pipeline, and pre-curing the semi-finished aerated concrete block in the pre-curing chamber through a pipeline heat absorption and release facility of the pre-curing chamber, wherein the pre-curing temperature is 40-60 ℃; and the other part of the waste heat steam is directly introduced into the slurry tank to be mixed with the material and heated to 40-50 ℃, so that the material mixing is completed.
2. The energy recycling process applied to the boiler according to claim 1, wherein: still include the waste heat steam recycle process of one-level waste heat catch basin: a second-stage waste heat collecting tank is arranged in the steam waste heat recycling system, and a second heat exchanger is arranged in the second-stage waste heat collecting tank; the first-stage waste heat collecting pool is provided with a first waste steam pipeline communicated with the first heat exchanger, and the first waste steam pipeline is communicated with a second heat exchanger in the second-stage waste heat collecting pool; a water outlet of the secondary waste heat collecting tank is also provided with a circulating pump which is communicated with the primary waste heat collecting tank through a pipeline; the waste heat steam led into the second heat exchanger is utilized to heat the water in the secondary waste heat water collecting tank to form hot water with the temperature being higher than 35 ℃, and the hot water in the secondary waste heat water collecting tank is conveyed into the primary waste heat water collecting tank by the circulating pump.
3. The energy recycling process applied to the boiler according to claim 2, characterized in that: the method also comprises a waste heat steam recycling process of the pre-curing chamber: and a second residual steam pipeline is arranged in the pre-curing chamber, and the residual heat steam in the second residual steam pipeline is merged with the residual heat steam in the first residual steam pipeline and then introduced into a second heat exchanger in the secondary residual heat water collecting tank to heat the water in the secondary residual heat water collecting tank together.
4. The energy recycling process applied to the boiler according to claim 3, wherein: still include the waste heat steam recycle process of second grade waste heat catch basin: a residual water and residual steam pipeline is arranged in the secondary waste heat collecting tank, one end of the residual water and residual steam pipeline is communicated with the second heat exchanger, and the other end of the residual water and residual steam pipeline is communicated with a steam-water recovery tank; and recovering the waste heat steam discharged by the second heat exchanger into a steam-water recovery tank by using a waste water and waste steam pipeline.
5. The energy recycling process applied to the boiler according to claim 4, wherein: still include the surplus water vapor recycling process in soda recovery pond: and introducing residual water and residual steam in the steam-water recovery tank into the slurry tank, and mixing the residual water and the residual steam with the materials to raise the temperature.
6. The energy recycling process applied to the boiler according to claim 2, characterized in that: the first heat exchanger and the second heat exchanger are both coil type helical fin radiators.
7. The energy recycling process applied to the boiler according to claim 2, characterized in that: and the secondary waste heat collecting tank is also provided with an overflow pipe, a blow-off pipe and a thermometer.
8. The energy recycling process applied to the boiler according to claim 1, wherein: the pipeline heat absorption and release facility of the pre-curing chamber comprises a snakelike finned tube radiator, a plate type multi-tube finned tube radiator, a flow control valve and a drain valve, and the steam flow in the pre-curing chamber is adjusted through the flow control valve to reach the optimal curing temperature required by each section and section of the pre-curing chamber.
9. The energy recycling process applied to the boiler according to claim 1, wherein: the bottom pipeline is also provided with a drainage outlet, the drainage outlets of all the still kettles are communicated with a drainage pipeline, and the drainage pipeline is connected with a drainage water collecting tank.
10. The energy recycling process applied to the boiler according to claim 1, wherein: the heat-insulating layer is arranged outside the primary waste heat collecting tank, and the overtemperature self-exhaust steam pipeline is arranged at the top of the primary waste heat collecting tank; a thermometer and a water level gauge are also arranged on the first-stage waste heat collecting tank.
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| US6230480B1 (en) * | 1998-08-31 | 2001-05-15 | Rollins, Iii William Scott | High power density combined cycle power plant |
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