CN218834117U - Flue gas denitration system for gas internal combustion generator - Google Patents
Flue gas denitration system for gas internal combustion generator Download PDFInfo
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- CN218834117U CN218834117U CN202223527364.4U CN202223527364U CN218834117U CN 218834117 U CN218834117 U CN 218834117U CN 202223527364 U CN202223527364 U CN 202223527364U CN 218834117 U CN218834117 U CN 218834117U
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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
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Abstract
The utility model relates to a flue gas denitration system for gas combustion generator, including the flue gas pipeline, flue gas reactor, exhaust-heat boiler, the chimney, urea storage component, urea preheating part and urea injection piece, the flue gas pipeline includes first flue gas pipeline, second flue gas pipeline and third flue gas pipeline, first flue gas pipeline entry and gas combustion generator's exhanst gas outlet intercommunication, first flue gas pipeline export and flue gas reactor entry intercommunication, flue gas reactor export and exhaust-heat boiler entry pass through second flue gas pipeline intercommunication, exhaust-heat boiler export and chimney entry pass through third flue gas pipeline intercommunication, urea preheating part sets up in second flue gas pipeline, urea injection piece sets up in first flue gas pipeline, urea preheating part entry and urea storage component export pass through first urea pipeline intercommunication, urea preheating part export and urea injection piece pass through second urea pipeline intercommunication. The utility model discloses need not to reform transform existing equipment on a large scale, energy-concerving and environment-protective, the cost is reduced, simple structure.
Description
Technical Field
The utility model belongs to the technical field of the flue gas denitration, concretely relates to a flue gas denitration system for gas internal combustion generator.
Background
With the stricter and stricter environmental protection requirements, the gas internal combustion engine generator also needs to be modified in environmental protection so as to meet the increasingly higher environmental protection requirements. The SCR denitration process is the most widely used denitration process with the best effect at present, and the principle is that NO in smoke is converted by a reducing agent under the action of a certain temperature and a catalyst X Selectively reduced into nontoxic and pollution-free nitrogen and water. In the prior art, liquid ammonia, ammonia water or urea is generally used as the reducing agent, but urea is currently most used as the reducing agent from the viewpoint of safety.
At present, ammonia is mainly prepared by urea pyrolysis or urea hydrolysis methods, in particular: urea pyrolysis is generally carried out by delivering 50% urea solution to a heat-insulating decomposition chamber through a metering system, a distribution system and an atomizing nozzle by using a delivery pump, wherein air in the decomposition chamber generally extracts high-temperature flue gas, then heating the high-temperature flue gas to about 600 ℃ by using an electric heater, and decomposing the urea solution into NH under high temperature and certain pressure 3 、H 2 0 and CO 2 And the hot flue gas enters a denitration system, and the method needs to be additionally provided with a series of equipment such as an electric heater, a heat insulation decomposition chamber, a fan and the like, so that the investment cost and the operation energy consumption are higher; urea hydrolysis is generally carried out by delivering 50% urea solution to hydrolysis reactor by delivery pump, feeding saturated steam into hydrolysis reactor through coil pipe, decomposing urea solution into NH under high temperature and certain pressure by action of catalyst 3 、H 2 0 and CO 2 The saturated steam is not mixed with urea solution, and is passed through the coiled pipe to make reflux, and the condensed water is connected with hydrophobic flash tank and recovered, said system mainly contains reaction system, steam heating system, urea metering supply system and detection systemThe system comprises a quantity and control system, a heat tracing system, a blowdown system and a steam purging system, the investment cost of the system is about twice that of a urea pyrolysis system, and the operation cost of the system is lower than that of the urea pyrolysis system. Therefore, the prior two processes of urea pyrolysis and urea hydrolysis need to consume larger investment cost in the early stage, the system structure is complex, the operation energy consumption and the cost are higher, and the method is not suitable for small and medium-scale generator sets.
Disclosure of Invention
The utility model aims at providing a flue gas denitration system is applicable to the gas combustion engine generator that exhaust emission temperature is 400 to 500 ℃.
In order to achieve the above purpose, the utility model adopts the technical scheme that:
the utility model provides a flue gas denitration system for gas combustion generator, includes flue gas pipeline, flue gas reactor, exhaust-heat boiler, chimney, urea storage component, urea preheating piece and urea injection piece, flue gas pipeline include first flue gas pipeline, second flue gas pipeline and third flue gas pipeline, the entry of first flue gas pipeline be linked together with gas combustion generator's exhanst gas outlet, the export of first flue gas pipeline with the entry of flue gas reactor be linked together, flue gas reactor in be provided with the catalyst layer, the export of flue gas reactor with exhaust-heat boiler's entry pass through second flue gas pipeline be linked together, exhaust-heat boiler's export with the entry of chimney pass through third flue gas pipeline be linked together, urea preheating piece set up in second flue gas pipeline, urea injection piece set up in first flue gas pipeline, urea preheating piece's entry with the export of urea storage component be linked together through first urea pipeline, urea preheating piece's export with urea injection piece be linked together through second urea pipeline.
Preferably, the urea preheating part adopts a finned heat exchanger.
Preferably, the first flue gas pipeline comprises a flue gas main pipe and a plurality of flue gas branch pipes, inlets of the plurality of flue gas branch pipes are communicated with flue gas outlets of the plurality of gas internal combustion generators, outlets of the plurality of flue gas branch pipes are communicated with the inlet of the flue gas main pipe, and the outlet of the flue gas main pipe is communicated with the inlet of the flue gas reactor.
Further preferably, the urea injection part is provided with a plurality of urea injection parts, and one urea injection part is arranged at the downstream of each smoke branch pipe.
Further preferably, each flue gas branch pipe is provided with a control valve, and the control valve is used for controlling the on-off of the flue gas branch pipe.
Preferably, a rectifying assembly is further arranged in the flue gas reactor, and the rectifying assembly is arranged upstream of the catalyst layer.
Further preferably, the rectifying assembly comprises a plurality of rectifying plates, and a rectifying channel is formed between every two adjacent rectifying plates.
Preferably, the urea storage assembly comprises a urea preparation device, a urea storage tank, a first delivery pump and a second delivery pump, an outlet of the urea preparation device is communicated with an inlet of the first delivery pump, an outlet of the first delivery pump is communicated with an inlet of the urea storage tank, an outlet of the urea storage tank is communicated with an inlet of the second delivery pump, and an outlet of the second delivery pump is communicated with an inlet of the urea preheating piece through the first urea pipeline.
Further preferably, a steam coil is arranged outside the urea storage tank, and the steam coil is used for keeping the temperature of the urea solution in the urea storage tank.
Preferably, the catalyst layer is provided with a plurality of catalyst layers, and the plurality of catalyst layers are distributed in the flue gas reactor; the catalyst layer adopts a high-temperature catalyst, and the high temperature range is 400-550 ℃.
Because of the application of the technical scheme, compared with the prior art, the utility model has the following advantages:
the utility model discloses a heat energy in the second flue gas pipeline between flue gas reactor and the exhaust-heat boiler preheats urea solution, and the high temperature flue gas that utilizes the export of gas internal combustion generator decomposes the urea solution through preheating, need not to carry out extensive transformation to existing equipment, does not have extra operation energy consumption, and energy-concerving and environment-protective has greatly reduced the cost, and simple structure, and convenient operation has reduced the fault probability, and the practicality is good.
Drawings
Fig. 1 is a schematic structural diagram of the flue gas denitration system of this embodiment.
In the drawings above: 1. a flue gas duct; 11. a first flue gas duct; 111. a flue gas main pipe; 112. a flue gas branch pipe; 12. a second flue gas duct; 13. a third flue gas duct; 14. a control valve; 2. a flue gas reactor; 21. a catalyst layer; 22. a rectifying component; 221. a rectifying plate; 3. a waste heat boiler; 4. a chimney; 5. a urea storage assembly; 51. a urea production unit; 52. a urea storage tank; 521. a steam coil; 53. a first delivery pump; 54. a second delivery pump; 6. a urea preheating part; 7. a urea injection member; 81. a first urea line; 82. a second urea line; 821. a urea main pipe; 822. a urea branch pipe; 9. gas internal combustion generator.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, 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 terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The utility model provides a flue gas denitration system for gas combustion generator, as shown in figure 1, this flue gas denitration system is linked together with gas combustion generator 9's exhanst gas outlet, flue gas denitration system includes flue gas reactor 2, exhaust-heat boiler 3, chimney 4, urea storage component 5, urea preheating part 6 and urea injection part 7, gas combustion generator 9, flue gas reactor 2, be linked together through flue gas pipeline 1 between exhaust-heat boiler 3 and the chimney 4, urea preheating part 6 and urea injection part 7 all set up in flue gas pipeline 1, urea storage component 5, urea preheating part 6 and urea injection part 7 are linked together through first urea pipeline 81 and second urea pipeline 82.
The following details each component and its connection relationship:
flue gas pipeline 1 includes first flue gas pipeline 11, second flue gas pipeline 12 and third flue gas pipeline 13, is linked together through first flue gas pipeline 11 between gas internal combustion generator 9 and the flue gas reactor 2, specifically: the inlet of the first flue gas pipeline 11 is communicated with the flue gas outlet of the gas internal combustion generator 9, and the outlet of the first flue gas pipeline 11 is communicated with the inlet of the flue gas reactor 2; this flue gas denitration system can be used for the flue gas denitration of a plurality of gas internal combustion generators 9 simultaneously, therefore first flue gas pipeline 11 includes that the flue gas is responsible for 111, flue gas branch pipe 112, and flue gas branch pipe 112 is provided with a plurality ofly, and the entry of a plurality of flue gas branch pipes 112 is linked together with the exhanst gas outlet of a plurality of gas internal combustion generators 9, and the export of a plurality of flue gas branch pipes 112 is responsible for 111 with the flue gas and is linked together, and the export that the flue gas is responsible for 111 is linked together with the entry of flue gas reactor 2.
Furthermore, in order to improve adaptability and ease of operation, the first flue gas duct 11 is provided with a control valve 14, specifically: each flue gas branch pipe 112 is provided with a control valve 14, and the control valve 14 is used for controlling the on-off of the flue gas branch pipe 112.
The flue gas reactor 2 is internally provided with a plurality of catalyst layers 21, the catalyst layers 21 are uniformly distributed in the flue gas reactor 2, the catalyst layers 21 are made of high-temperature catalyst, and the high-temperature range is 400-550 ℃, namely the high-temperature catalyst can generate catalytic action under the condition of 400-550 ℃; still be provided with rectification subassembly 22 in flue gas reactor 2, rectification subassembly 22 sets up the upper reaches at catalyst layer 21, and rectification subassembly 22 specifically includes a plurality of cowling panels 221, forms the rectification passageway between two adjacent cowling panels 221, and the specification of size of cowling panel 221, the specification of size of rectification passageway specifically accessible flow field analog technique obtain for the gas that gets into in flue gas reactor 2 can intensive mixing, the distribution is even, and in this embodiment, rectification subassembly 22 sets up the entrance at flue gas reactor 2.
The inlet of the second flue gas pipeline 12 is communicated with the outlet of the flue gas reactor 2, the outlet of the second flue gas pipeline 12 is communicated with the inlet of the waste heat boiler 3, the inlet of the third flue gas pipeline 13 is communicated with the outlet of the waste heat boiler 3, and the outlet of the third flue gas pipeline 13 is communicated with the inlet of the chimney 4.
The urea storage assembly 5 comprises a urea preparation device 51, a urea storage tank 52, a first delivery pump 53 and a second delivery pump 54, wherein the urea preparation device 51 is used for preparing a urea solution, for example, the urea preparation device 51 comprises a container, a stirrer, a steam coil or a hot water coil, urea raw materials are added into the container, and the stirring of the stirrer ensures that the urea is fully dissolved to prepare a urea solution with a concentration of about 40%, of course, only one embodiment is given here, but not limited thereto; an outlet of the urea preparation device 51 is communicated with an inlet of a first delivery pump 53, an outlet of the first delivery pump 53 is communicated with an inlet of a urea storage tank 52, and the first delivery pump 53 is used for pumping urea solution from the urea preparation device 51 to the urea storage tank 52 for storage; a steam coil 521 is arranged outside the urea storage tank 52, and the steam coil 521 is used for preserving the temperature of the urea solution in the urea storage tank 52 to ensure that the temperature of the urea solution is maintained at about 50 ℃; the outlet of the urea storage tank 52 communicates with the inlet of the second delivery pump 54, and the outlet of the second delivery pump 54 communicates with the inlet of the urea preheating part 6.
The urea preheating part 6 is arranged in the second flue gas pipeline 12, the urea preheating part 6 can adopt a fin type heat exchanger, the size of the urea preheating part is small, but the urea preheating part can provide a large contact area, and can realize full and comprehensive heat exchange, so that the urea solution can be fully preheated to about 200 ℃ with small resistance loss, and of course, only one embodiment is given here, but the embodiment is not limited thereto; the inlet of the urea preheating part 6 is communicated with the outlet of the urea storage component 5, specifically, the inlet of the urea preheating part 6 is communicated with the outlet of the second delivery pump 54 through a first urea pipeline 81.
The urea injection part 7 is arranged in the first flue gas pipeline 11, and the urea injection part 7 is communicated with the outlet of the urea preheating part 6 through a second urea pipeline 82. Specifically, the method comprises the following steps: the urea injection member 7 can adopt a spray gun, the spray gun is a two-fluid L-shaped injection device, the urea solution is atomized into fine droplets through a nozzle by compressed air and is sprayed in a fan shape, the atomization angle is 60 to 90 degrees, the atomization particle size is 50 to 100 micrometers, and the specific parameter specification can be reasonably selected according to the size of the first flue gas pipeline 11.
In addition, since the gas-fired internal combustion engine generator 9 is provided in plurality, the urea injection member 7 is also provided in plurality, and the number of the urea injection members 7 is the same as that of the gas-fired internal combustion engine generator 9, so that one urea injection member 7 is provided downstream of each flue gas branch pipe 112. Specifically, the method comprises the following steps: the second urea pipeline 82 comprises a main urea pipe 821 and a branch urea pipe 822, wherein the inlet of the main urea pipe 821 is communicated with the outlet of the urea preheating part 6, the outlet of the main urea pipe 821 is communicated with the inlets of the branch urea pipes 822, and the outlets of the branch urea pipes 822 extend into the main flue gas pipe 111 and are connected with and communicated with the urea injection part 7.
The working process of the flue gas denitration system of the embodiment is specifically described as follows:
adding a urea raw material into a urea preparation device 51 to prepare a urea solution with the concentration of about 40%, feeding the urea solution into a urea storage tank 52 through a first delivery pump 53, and ensuring that the temperature of the urea solution is maintained at about 50 ℃ through a steam coil 521; when the denitration system is in operation, the urea solution in the urea storage tank 52 is conveyed to the urea preheating part 6 through the second conveying pump 54, the urea preheating part 6 preheats the urea solution to about 200 ℃, then the urea solution is conveyed to the urea injection part 7, and the urea injection part 7 sprays the high-temperature urea solution into the first flue gas pipeline 11 in a mist form; at this time, high-temperature flue gas tail gas generated by the plurality of gas internal combustion generators 9 enters the flue gas main pipe 111 through the plurality of flue gas branch pipes 112, is fully mixed with ammonia gas decomposed from a urea solution, is rectified and mixed by the rectifying component 22, and then reacts under the catalytic action of the catalyst layer 21 to remove nitrogen oxides in the flue gas tail gas, and clean flue gas from which the nitrogen oxides are removed enters the waste heat boiler 3 through the second flue gas pipe 12, can exchange heat with the urea preheating piece 6 in the process to realize the preheating function of the urea preheating piece 6, and is finally discharged into the atmosphere through the third flue gas pipe 13 and the chimney 4.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered in the protection scope of the present invention.
Claims (10)
1. The utility model provides a flue gas deNOx systems for gas combustion engine generator which characterized in that: including flue gas pipeline, flue gas reactor, exhaust-heat boiler, chimney, urea storage component, urea preheating piece and urea injection piece, flue gas pipeline include first flue gas pipeline, second flue gas pipeline and third flue gas pipeline, the entry of first flue gas pipeline be linked together with gas internal combustion generator's exhanst gas outlet, the export of first flue gas pipeline with the entry of flue gas reactor be linked together, flue gas reactor in be provided with the catalyst layer, flue gas reactor the export with exhaust-heat boiler's entry pass through second flue gas pipeline be linked together, exhaust-heat boiler the export with the entry of chimney pass through third flue gas pipeline be linked together, urea preheating piece set up second flue gas pipeline in, urea injection piece set up first flue gas pipeline in, urea preheating piece the entry with the export of urea storage component be linked together through first urea pipeline, urea preheating piece the export with urea injection piece be linked together through second urea pipeline.
2. The flue gas denitration system for a gas internal combustion generator according to claim 1, characterized in that: the urea preheating part adopts a finned heat exchanger.
3. The flue gas denitration system for a gas internal combustion generator as set forth in claim 1, wherein: the first flue gas pipeline comprises a flue gas main pipe and a plurality of flue gas branch pipes, inlets of the flue gas branch pipes are communicated with flue gas outlets of a plurality of gas internal combustion generators, outlets of the flue gas branch pipes are communicated with the inlets of the flue gas main pipe, and the outlets of the flue gas main pipe are communicated with the inlets of the flue gas reactors.
4. The flue gas denitration system for a gas internal combustion generator of claim 3, characterized in that: the urea injection part is provided with a plurality of urea injection parts, and the downstream of each smoke branch pipe is provided with one urea injection part.
5. The flue gas denitration system for a gas internal combustion generator as set forth in claim 3, wherein: each smoke branch pipe is provided with a control valve, and the control valve is used for controlling the on-off of the smoke branch pipe.
6. The flue gas denitration system for a gas internal combustion generator as set forth in claim 1, wherein: and a rectifying assembly is also arranged in the flue gas reactor and is arranged at the upstream of the catalyst layer.
7. The flue gas denitration system for a gas internal combustion generator as set forth in claim 6, wherein: the rectifying assembly comprises a plurality of rectifying plates, and a rectifying channel is formed between every two adjacent rectifying plates.
8. The flue gas denitration system for a gas internal combustion generator according to claim 1, characterized in that: the urea storage component comprises a urea preparation device, a urea storage tank, a first delivery pump and a second delivery pump, wherein an outlet of the urea preparation device is communicated with an inlet of the first delivery pump, an outlet of the first delivery pump is communicated with an inlet of the urea storage tank, an outlet of the urea storage tank is communicated with an inlet of the second delivery pump, and an outlet of the second delivery pump is communicated with an inlet of the urea preheating piece through a first urea pipeline.
9. The flue gas denitration system for a gas internal combustion generator as set forth in claim 8, wherein: the outside of urea storage jar be provided with the steam coil pipe, the steam coil pipe be used for right the urea solution heat preservation in the urea storage jar.
10. The flue gas denitration system for a gas internal combustion generator as set forth in claim 1, wherein: the catalyst layers are arranged in plurality and distributed in the flue gas reactor; the catalyst layer adopts a high-temperature catalyst, and the high temperature range is 400-550 ℃.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223527364.4U CN218834117U (en) | 2022-12-28 | 2022-12-28 | Flue gas denitration system for gas internal combustion generator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223527364.4U CN218834117U (en) | 2022-12-28 | 2022-12-28 | Flue gas denitration system for gas internal combustion generator |
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| CN218834117U true CN218834117U (en) | 2023-04-11 |
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| CN202223527364.4U Active CN218834117U (en) | 2022-12-28 | 2022-12-28 | Flue gas denitration system for gas internal combustion generator |
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