CN112546864B - SCR denitration system - Google Patents
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- CN112546864B CN112546864B CN202011282320.2A CN202011282320A CN112546864B CN 112546864 B CN112546864 B CN 112546864B CN 202011282320 A CN202011282320 A CN 202011282320A CN 112546864 B CN112546864 B CN 112546864B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9404—Removing only nitrogen compounds
- B01D53/9409—Nitrogen oxides
- B01D53/9431—Processes characterised by a specific device
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/346—Controlling the process
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9495—Controlling the catalytic process
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/01—Engine exhaust gases
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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Abstract
The invention provides an SCR (selective catalytic reduction) denitration system which comprises a heat dissipation water tank, an internal combustion engine generator set, an SCR denitration device and a spraying unit, wherein the internal combustion engine generator set comprises a flue gas outlet, an intercooled water inlet and a cold water outlet, the SCR denitration device is communicated with the flue gas outlet through a flue, the heat dissipation water tank is communicated with the intercooled water inlet through a first pipeline, the spraying unit is communicated with the intercooled water outlet through a second pipeline, and the spraying unit is arranged in the flue. The inter-cooling water from the heat radiation water tank firstly enters the internal combustion engine generator set to cool the internal combustion engine generator set, so that the internal combustion engine generator set is ensured to work at the optimal temperature; and then, spraying the intercooling water from the internal combustion engine generator set into a flue through a spraying unit to cool the flue gas from the internal combustion engine generator set, so that the medium-temperature SCR catalyst is suitable for denitration treatment of the flue gas of the internal combustion engine generator set.
Description
Technical Field
The invention relates to the technical field of flue gas denitration, in particular to an SCR denitration system.
Background
The internal combustion engine takes natural gas or fuel oil as fuel, and drives a generator set to generate electricity by combustion to generate high-grade electric energy. The internal combustion engine is most commonly a piston type internal combustion engine. The piston type internal combustion engine mixes fuel and air and burns in a cylinder of the engine, and the released heat energy enables the cylinder to generate high-temperature and high-pressure fuel gas. The gas expands to drive the piston to do work, and then the piston is driven to do work through a crank-link mechanism or other mechanismsAnd outputting mechanical work to drive the driven machine to work. Because the piston type internal combustion engine can not realize low-nitrogen combustion, the mass concentration of NOx discharged in the smoke is higher, generally 200mg/m 3 Above, the requirements for discharging pollutants in the atmosphere are far exceeded. Therefore, denitration treatment is required before the flue gas is discharged to the outside.
Selective Catalytic Reduction (SCR) is the mainstream technology for denitration in China at present, and liquid ammonia is sprayed into flue gas and is reacted with NO under the action of a catalyst x The reaction is carried out to generate nitrogen and water which are nontoxic and pollution-free, thereby realizing the removal of the nitrogen oxide. The activity of the catalyst is a key factor affecting the denitration efficiency, however, the activity of the catalyst is related to the temperature of the flue gas. Specifically, the temperature window of the medium-temperature SCR catalyst is 300-400 ℃, the temperature of the flue gas discharged by the internal combustion engine is usually 400-450 ℃, and when the medium-temperature SCR catalyst is used for denitration treatment of the flue gas discharged by the internal combustion engine, the activity of the catalyst is not high, so that the denitration efficiency is low, and the service life of the catalyst is greatly shortened, namely, the medium-temperature SCR catalyst is not suitable for denitration treatment of the flue gas generated by the internal combustion engine. Usually, a high-temperature SCR catalyst with a temperature window of 350-450 ℃ is selected for denitration treatment. However, the high-temperature SCR catalyst is expensive, which undoubtedly increases the cost of the denitration treatment.
Disclosure of Invention
Therefore, the invention aims to solve the technical problem of overcoming the defect that the traditional medium-temperature SCR catalyst is not suitable for denitration treatment of flue gas of an internal combustion engine generator set, thereby providing an SCR denitration system.
The invention provides an SCR (selective catalytic reduction) denitration system which comprises a heat dissipation water tank, an internal combustion engine generator set, an SCR denitration device and a spraying unit, wherein the internal combustion engine generator set comprises a flue gas outlet, an intercooling water inlet and a moderate cooling water outlet, the SCR denitration device is communicated with the flue gas outlet through a flue, the heat dissipation water tank is communicated with the intercooling water inlet through a first pipeline, the spraying unit is communicated with the intercooling water outlet through a second pipeline, and the spraying unit is arranged in the flue.
Optionally, the heat radiation water tank is communicated with the intercooling water outlet through a third pipeline, the second pipeline is connected with the third pipeline through a communicating valve, and the second pipeline is further provided with a flow control valve to control the flow of the spraying unit.
Optionally, the SCR denitration system further includes: the first temperature sensor is arranged in the flue and is positioned at the downstream of the spraying unit; and the first control module is electrically connected with the first temperature sensor and the flow control valve so as to control the flow of the spraying unit according to the numerical value of the first temperature sensor.
Optionally, the SCR denitration system further includes: the second temperature sensor is arranged in the flue and is positioned at the upstream of the spraying unit; and the second control module is electrically connected with the second temperature sensor and the communication valve so as to control the spraying unit to be opened and closed according to the temperature of the smoke from the internal combustion engine generator set.
Optionally, the SCR denitration system further includes: the generating power testing device is electrically connected with the internal combustion engine generating set; and the third control module is electrically connected with the generated power testing device and the communication valve so as to control the spraying unit to be opened and closed according to the instantaneous generated power of the internal combustion engine generator set.
Optionally, the spraying unit includes a spraying pipe and a plurality of nozzles, and the nozzles are disposed on the spraying pipe.
Optionally, the included angle between the nozzle and the flow direction of the flue gas is 0-90 °.
Optionally, the number of the nozzles is 9-25.
Optionally, the shower pipe is annular or spiral in shape and abuts against part of the inner wall of the flue; or the spraying pipe comprises a plurality of branch pipes which are connected in series, and the plane where the spraying pipe is located is perpendicular to the inner wall of the flue.
Optionally, the nozzle is an atomizing nozzle.
The technical scheme of the invention has the following advantages:
1. the SCR denitration system comprises a heat dissipation water tank, an internal combustion engine generator set, an SCR denitration device and a spraying unit, wherein the internal combustion engine generator set comprises a flue gas outlet, an intercooling water inlet and a cold water outlet, the SCR denitration device is communicated with the flue gas outlet through a flue, the heat dissipation water tank is communicated with the intercooling water inlet through a first pipeline, the spraying unit is communicated with the intercooling water outlet through a second pipeline, and the spraying unit is arranged in the flue. The inter-cooling water from the heat radiation water tank firstly enters the internal combustion engine generator set to cool the internal combustion engine generator set, so that the internal combustion engine generator set is ensured to work at the optimal temperature; then, the middle cooling water from the internal combustion engine generator set is sprayed into the flue through the spraying unit to cool the flue gas from the internal combustion engine generator set, so that the flue gas reaches the temperature window of the middle temperature SCR catalyst, the middle temperature SCR catalyst is suitable for denitration treatment of the flue gas of the internal combustion engine generator set, and the middle temperature SCR catalyst can have higher activity after the flue gas enters the SCR denitration device, so that higher denitration efficiency is ensured; meanwhile, the inter-cooling water from the internal combustion engine generator set firstly cools the internal combustion engine generator set and then cools the high-temperature flue gas, so that the cascade utilization of energy is realized, and the denitration treatment cost is favorably reduced.
2. In the SCR denitration system provided by the invention, the heat radiation water tank is communicated with the intercooling water outlet through a third pipeline, the second pipeline is connected with the third pipeline through a communicating valve, and the second pipeline is provided with a flow control valve. The intercooling water from the intercooling water outlet firstly enters a third pipeline, the communication valve is used for realizing the shunting of the intercooling water, so that one part of the intercooling water enters the second pipeline, the other part of the intercooling water enters the heat dissipation water tank along the third pipeline, and the flow of the intercooling water entering the second pipeline is controlled through the flow control valve. Namely, the flow of the medium-cooling water entering the second pipeline is controlled by arranging a third pipeline, a communication valve and a flow control valve, so that the flow of the spraying unit is controlled, and then the cooling efficiency of the smoke is controlled.
3. According to the SCR denitration system provided by the invention, the first temperature sensor is arranged at the downstream of the spraying unit and used for measuring the temperature of the cooled flue gas and feeding the temperature back to the first control module, so that the first control module can regulate and control the flow control valve according to the flue gas temperature to control the flow of the spraying unit, and the temperature of the cooled flue gas is ensured to be in a temperature window of the medium-temperature SCR catalyst.
4. According to the SCR denitration system provided by the invention, the included angle between the nozzle and the flow direction of the flue gas is 0-90 degrees, so that the flue gas is favorably and fully contacted with sprayed intercooled water, and the cooling effect of the flue gas is promoted.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural view of an SCR denitration system provided in a first embodiment of the present invention;
fig. 2 is a schematic structural view of an SCR denitration system according to a second embodiment of the present invention;
description of reference numerals:
1-an internal combustion engine generator set; 2-a flow control valve; 3-a second temperature sensor; 4-a spraying unit; 5-a first temperature sensor; 6-SCR denitration device; 7-flue gas hot water type lithium bromide machine; 8-a chimney; 9-a generating power testing device; 10-a heat dissipation water tank; 11-a first conduit; 12-a second conduit; 13-a third line; 14-communication valve.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the term "connected" is to be interpreted broadly, e.g. as a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
The embodiment provides an SCR denitration system, which comprises a heat dissipation water tank 10, an internal combustion engine generator set 1, an SCR denitration device 6, a spraying unit 4, a flue gas hot water type lithium bromide machine 7 and a chimney 8, wherein the internal combustion engine generator set 1 comprises a flue gas outlet, an inter-cooling water inlet and an inter-cooling water outlet, the SCR denitration device 6 is communicated with the flue gas outlet through a flue, the heat dissipation water tank 10 is communicated with the inter-cooling water inlet through a first pipeline 11, the spraying unit 4 is communicated with the inter-cooling water outlet through a second pipeline 12, the spraying unit 4 is arranged in the flue, and the SCR denitration device 6, the flue gas hot water type lithium bromide machine 7 and the chimney 8 are sequentially communicated so that flue gas after denitration reaction is discharged from the chimney 8 after entering the flue gas hot water type lithium bromide machine 7.
In the SCR denitration system, the inter-cooling water from the heat dissipation water tank 10 firstly enters the internal combustion engine generator set 1 to cool the internal combustion engine generator set, so as to ensure that the internal combustion engine generator set 1 works at the optimal temperature; subsequently, the middle cooling water from the internal combustion engine generator set 1 is sprayed into the flue through the spraying unit 4 to cool the flue gas from the internal combustion engine generator set 1, so that the flue gas reaches the temperature window of the middle temperature SCR catalyst, the middle temperature SCR catalyst is suitable for denitration treatment of the flue gas of the internal combustion engine generator set 1, and after the flue gas enters the SCR denitration device 6, the middle temperature SCR catalyst can have higher activity, so that higher denitration efficiency is ensured; meanwhile, the inter-cooling water from the internal combustion engine generator set 1 firstly cools the internal combustion engine generator set 1, and then cools the high-temperature flue gas, so that the gradient utilization of energy is realized, and the denitration treatment cost is favorably reduced. The medium cooling water is evaporated in the process of cooling the flue gas, and medium cooling water vapor enters the SCR denitration device 6 and the flue gas hot water type lithium bromide machine 7 together with the flue gas in sequence and is finally discharged from the chimney 8.
Further, as shown in fig. 1, the heat radiation water tank 10 is communicated with the intercooling water outlet through a third pipeline 13, the second pipeline 12 is connected with the third pipeline 13 through a communication valve 14, and the second pipeline 12 is further provided with a flow control valve 2. The intercooled water from the intercooled water outlet firstly enters the third pipeline 13, the communication valve 14 is used for realizing the diversion of the intercooled water, so that a part of the intercooled water enters the second pipeline 12, and the other part of the intercooled water enters the heat dissipation water tank 10 along the third pipeline 13, wherein the flow rate of the intercooled water entering the second pipeline 12 is controlled through the flow control valve 2. That is, the flow rate of the medium-cooling water entering the second pipeline 12 is controlled by arranging the third pipeline 13, the communication valve 14 and the flow control valve 2, so that the flow rate of the spraying unit 4 is controlled, and the cooling efficiency of the flue gas is controlled.
Further, the communication valve 14 is an electromagnetic valve.
In this embodiment, the SCR denitration system further includes: the first temperature sensor 5 is arranged in the flue and is positioned at the downstream of the spraying unit 4; and the first control module (not shown in the figure) is electrically connected with the first temperature sensor 5 and the flow control valve 2 so as to control the flow of the spraying unit 4 according to the value of the first temperature sensor 5. First temperature sensor 5 is used for measuring the flue gas temperature after the cooling to feed back above-mentioned temperature to first control module group, make first control module group can regulate and control flow control valve 2 according to flue gas temperature, in order to control the flow of unit 4 sprays, thereby guarantees that the flue gas temperature after the cooling is in the temperature window of medium temperature SCR catalyst. Specifically, a temperature window of the medium-temperature SCR catalyst is preset in the first control module, the first temperature sensor 5 feeds the measured flue gas temperature back to the first control module, and the first control module judges whether the flue gas temperature exceeds the temperature window of the medium-temperature SCR catalyst; when the temperature of the flue gas exceeds the temperature window of the medium-temperature SCR catalyst, the first control module controls the flow control valve 2 to increase the flow of the spraying unit 4 so as to improve the cooling efficiency; when the temperature of the flue gas is smaller than the temperature window of the medium-temperature SCR catalyst, the first control module controls the flow control valve 2 to reduce the flow of the spraying unit 4, so that the cooling efficiency is reduced.
In this embodiment, the SCR denitration system further includes: the second temperature sensor 3 is arranged in the flue and is positioned at the upstream of the spraying unit 4; a second control module (not shown in the figure) electrically connected with the second temperature sensor 3 and the communication valve 14 to control the opening and closing of the spraying unit 4 according to the temperature of the flue gas from the internal combustion engine generator set 1. Specifically, a temperature window of the medium-temperature SCR catalyst is preset in the second control module, when the flue gas from the internal combustion engine generator set 1 passes through the flue, the second temperature sensor 3 measures the temperature of the flue gas and feeds the temperature of the flue gas back to the second control module, and the second control module judges whether the temperature of the flue gas exceeds the temperature window of the medium-temperature SCR catalyst; when the temperature of the flue gas exceeds the temperature window of the medium-temperature SCR catalyst, the second control module controls the communication valve 14 to be opened, so that the spraying unit 4 sprays medium-cold water into the flue, and the flue gas is cooled; when the temperature of the flue gas is lower than the temperature window of the medium-temperature SCR catalyst, the second control module controls the communication valve 14 to be closed, so that the spraying unit 4 stops spraying medium-cold water into the flue and stops cooling the flue gas.
In addition, the first control module is electrically connected with the second control module, so that the first control module controls the flow control valve 2 to control the flow of the spraying unit 4 only in the state that the second control module controls the communicating valve 14 to be opened.
In this embodiment, the spraying unit 4 includes a spraying pipe and a plurality of nozzles, and the nozzles are disposed on the spraying pipe. The intercooled water from the intercooled water outlet of the internal combustion engine generator set 1 enters a third pipeline, then is subjected to flow splitting at the communication valve 14, a part of the cold water enters the second pipeline 12, flows along the spraying pipe after flowing out of the second pipeline 12, and then is sprayed into the flue through the nozzle to cool the flue gas. Specifically, in this embodiment, the nozzle is an atomizing nozzle.
As an alternative embodiment, the shower pipe is annular or spiral in shape and abuts against a portion of the inner wall of the flue. The nozzles are all arranged towards the inside of the flue, so that the intercooling water from each nozzle is sprayed towards the center of the pipeline. As another optional embodiment, the spray pipe comprises a plurality of branch pipes, the branch pipes are connected in series, and the plane of the spray pipe is perpendicular to the inner wall of the flue. It should be understood that the arrangement of the shower pipes includes, but is not limited to, the above two ways.
Furthermore, the included angle between the nozzle and the flow direction of the flue gas is 0-90 degrees, and the included angle is favorable for the full contact of the flue gas and the sprayed intercooled water, so that the cooling effect of the flue gas is promoted. For example, in the present embodiment, the included angle between the nozzle and the flow direction of the flue gas may be 0 °, 30 °, 45 °, 60 °, or 90 °.
Further, the number of the nozzles is 9-25. The number of the nozzles is beneficial to ensuring the spraying amount of the medium-cold water in the flue, thereby achieving effective cooling. For example, in the present embodiment, the number of the nozzles may be 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, or 25.
The working process of the SCR denitration system provided in this embodiment is as follows:
(1) the flue gas generated by the internal combustion engine generator set enters the flue through the flue gas outlet;
(2) the intercooled water from the intercooled water outlet firstly enters the third pipeline 13, and the communication valve 14 is used for realizing the diversion of the intercooled water, so that a part of the intercooled water continuously enters the heat dissipation water tank 10 along the third pipeline 13, and the other part of the intercooled water enters the second pipeline 12;
(3) when the flue gas passes through the second temperature sensor 3, the second temperature sensor 3 measures the temperature of the flue gas and feeds the temperature of the flue gas back to the second control module, and the second control module judges whether the temperature of the flue gas exceeds the temperature window of the medium-temperature SCR catalyst or not; when the temperature of the flue gas exceeds the temperature window of the medium-temperature SCR catalyst, the second control module controls the communication valve 14 to be opened, so that the intercooled water entering the second pipeline 12 is sprayed into the flue through the spraying unit, and the flue gas is cooled;
(4) when the cooled flue gas passes through the first temperature sensor 5, the first temperature sensor 5 feeds the measured flue gas temperature back to the first control module, and the first control module judges whether the flue gas temperature exceeds a temperature window of the medium-temperature SCR catalyst; when the temperature of the flue gas exceeds the temperature window of the medium-temperature SCR catalyst, the first control module controls the flow control valve 2 to increase the flow of the spraying unit 4 so as to improve the cooling efficiency; when the temperature of the flue gas is lower than the temperature window of the medium-temperature SCR catalyst, the first control module controls the flow control valve 2 to reduce the flow of the spraying unit 4, so that the cooling efficiency is reduced;
(5) the medium cooling water cools the flue gas and then converts the flue gas into medium cooling water vapor, the medium cooling water vapor enters the SCR denitration device 6 and the flue gas hot water type lithium bromide machine 7 in sequence along with the cooled flue gas, and finally the flue gas is discharged from a chimney 8.
When the flue gas temperature measured by the second temperature sensor 3 is lower than the temperature window of the medium-temperature SCR catalyst, the second control module controls the communicating valve 14 to close, the flue gas is not cooled, and the flue gas sequentially enters the SCR denitration device 6 and the flue gas hot water type lithium bromide machine 7 and is finally discharged through the chimney 8.
Example 2
As shown in fig. 2, the present embodiment provides an SCR denitration system, which is different from the SCR denitration system provided in embodiment 1 only in that: SCR deNOx systems does not include second temperature sensor and second control module group, but includes:
the generating power testing device 9 is electrically connected with the internal combustion engine generator set 1;
and a third control module (not shown in the figure) electrically connected with the generated power testing device 9 and the communication valve 14 so as to control the opening and closing of the spraying unit 4 according to the instantaneous generated power of the internal combustion engine generator set 1.
Specifically, the generated power testing device 9 is used for testing the generated power of the internal combustion engine generator set 1, and a generated power range corresponding to the temperature window of the medium-temperature SCR catalyst is preset in the third control module; when the generated power is smaller than the preset generated power, the third control module controls the communication valve 14 to be opened, so that the spraying unit 4 sprays cold water into the flue, and the flue gas is cooled; when the generated power exceeds the preset generated power, the third control module controls the communicating valve 14 to be closed, so that the spraying unit 4 stops spraying the medium-cold water into the flue and stops cooling the flue gas.
Specifically, the generated power testing device 9 may be a multifunctional meter.
In addition, the first control module is electrically connected with the third control module so that the first control module controls the flow rate of the spray unit 4 by the flow rate control valve 2 only in a state where the third control module controls the communicating valve 14 to be opened.
The working process of the SCR denitration system provided in this embodiment is as follows:
(1) the flue gas generated by the internal combustion engine generator set enters the flue through the flue gas outlet;
(2) the intercooled water from the intercooled water outlet firstly enters the third pipeline 13, and the communication valve 14 is used for realizing the diversion of the intercooled water, so that one part of the intercooled water continuously enters the heat dissipation water tank 10 along the third pipeline 13, and the other part of the intercooled water enters the second pipeline 12;
(3) the generated power testing device 9 tests the generated power of the internal combustion engine generator set 1, and when the generated power is smaller than the preset generated power, the third control module controls the communicating valve 14 to be opened, so that the intercooled water entering the second pipeline 12 is sprayed into the flue through the spraying unit, and the flue gas is cooled;
(4) when the cooled flue gas passes through the first temperature sensor 5, the first temperature sensor 5 feeds the measured flue gas temperature back to the first control module, and the first control module judges whether the flue gas temperature exceeds a temperature window of the medium-temperature SCR catalyst; when the temperature of the flue gas exceeds the temperature window of the medium-temperature SCR catalyst, the first control module controls the flow control valve 2 to increase the flow of the spraying unit 4 so as to improve the cooling efficiency; when the temperature of the flue gas is lower than the temperature window of the medium-temperature SCR catalyst, the first control module controls the flow control valve 2 to reduce the flow of the spraying unit 4, so that the cooling efficiency is reduced;
(5) the medium cooling water cools the flue gas and then converts the flue gas into medium cooling water vapor, and the medium cooling water vapor enters the SCR denitration device 6 and the flue gas hot water type lithium bromide machine 7 in sequence along with the cooled flue gas and is finally discharged from a chimney 8.
When the generated power exceeds the preset generated power, the third control module controls the communicating valve 14 to be closed, the flue gas is not cooled, and the flue gas sequentially enters the SCR denitration device 6 and the flue gas hot water type lithium bromide machine 7 and is finally discharged through the chimney 8.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (8)
1. An SCR denitration system is characterized by comprising a heat dissipation water tank, an internal combustion engine generator set, an SCR denitration device and a spraying unit, wherein the internal combustion engine generator set comprises a flue gas outlet, an intercooling water inlet and an intercooling water outlet, the SCR denitration device is communicated with the flue gas outlet through a flue, the heat dissipation water tank is communicated with the intercooling water inlet through a first pipeline, the spraying unit is communicated with the intercooling water outlet through a second pipeline, the spraying unit is arranged in the flue, the heat dissipation water tank is communicated with the intercooling water outlet through a third pipeline, and the second pipeline is connected with the third pipeline through a communicating valve;
the SCR deNOx systems still includes: the generating power testing device is electrically connected with the internal combustion engine generating set; and the third control module is electrically connected with the generated power testing device and the communication valve so as to control the spraying unit to be opened and closed according to the instantaneous generated power of the internal combustion engine generator set.
2. The SCR denitration system of claim 1, wherein the second pipe is further provided with a flow control valve to control a flow rate of the sprinkling unit.
3. The SCR denitration system of claim 2, further comprising:
the first temperature sensor is arranged in the flue and is positioned at the downstream of the spraying unit;
and the first control module is electrically connected with the first temperature sensor and the flow control valve so as to control the flow of the spraying unit according to the numerical value of the first temperature sensor.
4. The SCR denitration system of any one of claims 1 to 3, wherein the spray unit comprises a spray pipe and a plurality of nozzles, and the nozzles are arranged on the spray pipe.
5. The SCR denitration system of claim 4, wherein the nozzle is angled from 0 ° to 90 ° with respect to the flow direction of the flue gas.
6. The SCR denitration system of claim 4, wherein the number of nozzles is 9-25.
7. The SCR denitration system of claim 4,
the spray pipe is annular or spiral and is abutted against part of the inner wall of the flue; or the like, or, alternatively,
the spraying pipe comprises a plurality of branch pipes which are connected in series, and the plane where the spraying pipe is located is perpendicular to the inner wall of the flue.
8. The SCR denitration system of claim 4, wherein the nozzle is an atomizing nozzle.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011282320.2A CN112546864B (en) | 2020-11-16 | 2020-11-16 | SCR denitration system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011282320.2A CN112546864B (en) | 2020-11-16 | 2020-11-16 | SCR denitration system |
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