CN216093024U

CN216093024U - Modular SNCR flue gas denitration system

Info

Publication number: CN216093024U
Application number: CN202122217848.8U
Authority: CN
Inventors: 黄文萍
Original assignee: Nanjing Xinfeng Automation Control Engineering Co ltd
Current assignee: Nanjing Xinfeng Automation Control Engineering Co ltd
Priority date: 2021-09-14
Filing date: 2021-09-14
Publication date: 2022-03-22
Anticipated expiration: 2031-09-14

Abstract

The utility model relates to a modularized SNCR flue gas denitration system.A discharge end of a feeder is butted with a feed end of a mixer; the discharge end of the mixer is connected with the feed end of the unloading tank by adopting a first pipeline; the discharge end of the transfer tank is connected with the feed end of the urea tank and provided with a second pipeline; the discharge end of the urea tank is connected with a third pipeline; a urea conveying module and a dilution metering module are sequentially arranged on the third pipeline from the feed end; the water outlet end of the water tank is connected with a fourth pipeline; a water source conveying module, a dilution metering module and a distribution main module are sequentially arranged on the fourth pipeline from the water inlet end; the discharge end of the dilution metering module is connected with the feed end of the liquid distribution module; the modularized SNCR flue gas denitration system provided by the utility model has the advantages of high denitration efficiency, low operation cost, convenience in equipment installation and easiness in operation, less ammonia escape during perfect monitoring and accurate raw material proportioning.

Description

Modular SNCR flue gas denitration system

Technical Field

The utility model belongs to the related technical field of environment-friendly purification equipment, and particularly relates to a modular SNCR flue gas denitration system.

Background

The nitrogen oxide generated in the operation process of the boiler causes serious pollution to the atmospheric environment, and with the tightening of the national emission limit value of the nitrogen oxide, the tail end treatment means of the nitrogen oxide is widely adopted, and at present, SNCR is the most main tail end treatment means; in order to prevent the environment pollution caused by excessive nitrogen oxides generated after coal combustion in a boiler, denitration treatment is carried out on the discharged flue gas after the coal combustion, wherein the denitration comprises denitration before combustion, denitration during combustion and denitration after combustion, and the denitration after combustion is further divided into selective non-catalytic reduction denitration (SNCR), selective catalytic reduction denitration (SCR), activated carbon adsorption, electron beam denitration and the like.

The SNCR denitration technology, namely a selective non-catalytic reduction technology, is a clean denitration technology which does not use a catalyst, uses a reducing agent such as NH3, urea and the like to be sprayed into a furnace to selectively react with nitrogen oxides, (because the catalyst is not used, the reducing agent needs to be added in a high-temperature region), sprays reducing agents containing amino (such as ammonia water, urea solution and the like) into the furnace at the temperature of 850-1200 ℃, reduces and removes the nitrogen oxides in flue gas, and generates nitrogen and water, wherein the most commonly used medicines are ammonia and urea.

The SNCR denitration system in the industry at present has the following problems:

(1) the investment cost of selective catalytic reduction denitration (SCR) of nitrogen oxides is greatly influenced by the price and volume of the catalyst, the operation cost of the SCR denitration catalyst is mainly influenced by the service life of the catalyst, and the investment and operation costs are high.

(2) The equipment is inconvenient to install, needs to be processed on site, and has certain potential safety hazards in the stacking of materials on site and a large amount of welding work.

(3) The monitoring and measurement are not in place, the equipment cannot be monitored immediately, and the control integrity is not monitored, so that ammonia escapes, the denitration efficiency is reduced, and the consumption and the cost of the reducing agent are increased.

(4) The urea feeding of the SNCR flue gas denitration system is generally manual feeding, a bag filled with urea is manually poured into a urea stirring tank, the stirring tank is generally high in volume, and the urea is required to climb up when being manually poured into the stirring tank, so that certain potential safety hazards exist; secondly, the urea has certain corrosiveness and also has certain influence on human bodies; thirdly, the urea is accumulated for a long time, blocks are generated, manual breaking is needed, and the working strength is increased; fourthly, the processing of urea and water into 30 percent ammonia water requires a certain proportion, and the manual feeding can not achieve the perfect proportion.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a modular SNCR flue gas denitration system which is high in denitration efficiency, low in running cost, convenient to install and easy to operate, less in ammonia escape during perfect monitoring and accurate in raw material ratio.

In order to achieve the purpose, the utility model provides the following technical scheme: a modularized SNCR flue gas denitration system comprises a feeder, a mixer, a dump tank, a urea tank, a water tank, a urea conveying module, a water source conveying module, a dilution metering module, a distribution main module, a liquid distribution module, a gas distribution module, a boiler and an air compressor; the discharge end of the feeder is butted with the feed end of the mixer; the discharge end of the mixer is connected with the feed end of the unloading tank through a first pipeline; the discharge end of the transfer tank is connected with the feed end of the urea tank and provided with a second pipeline; the discharge end of the urea tank is connected with a third pipeline; a urea conveying module and a dilution metering module are sequentially arranged on the third pipeline from the feed end; the water outlet end of the water tank is connected with a fourth pipeline; a water source conveying module, a dilution metering module and a distribution main module are sequentially arranged on the fourth pipeline from the water inlet end; the distribution total module comprises a liquid distribution module and a gas distribution module; the discharge end of the dilution metering module is connected with the feed end of the liquid distribution module; the air inlet end of the air distribution module is connected to the air outlet end of the air compressor by adopting a fifth pipeline; the liquid outlet end of the liquid distribution module and the gas outlet end of the gas distribution module are right opposite to the feeding hole of the boiler.

As a further improvement of the utility model, the urea delivery module is provided with a first butterfly valve, a first cylinder type filter, a first delivery pump and a second butterfly valve in sequence from the feed end; and the feed end of the urea conveying module is also provided with an ammonia water conveying standby pipe in a butt joint mode.

As a further improvement of the utility model, the water source conveying module is provided with a third butterfly valve, a second cylinder type filter, a second conveying pump and a fourth butterfly valve in sequence from the water inlet end.

As a further improvement of the utility model, the dilution metering module is installed together with the fourth pipeline by adopting a sixth pipeline in a butt joint way; the dilution metering module is in butt joint with the third pipeline by adopting a seventh pipeline; the sixth pipeline and the seventh pipeline are sequentially provided with a first ball valve, a second ball valve, a third cylinder type filter, a third delivery pump, a first check valve, a third ball valve and a fourth ball valve from the feeding end; an eighth pipeline is connected and installed between the two first ball valves and the two second ball valves; a ninth pipeline is connected and installed between the two third ball valves and the two fourth ball valves; fifth ball valves are symmetrically arranged on the eighth pipeline; sixth ball valves are symmetrically arranged on the ninth pipeline; and a second standby ball valve, a third cylindrical filter, a bottom three delivery pump and a first check valve are sequentially arranged between the fifth ball valve and the sixth ball valve through pipelines.

As a further improvement of the utility model, the liquid distribution module is connected with the discharge end of the dilution metering module by adopting a tenth pipeline; the tenth pipeline is sequentially provided with a seventh ball valve, a first electric regulating valve, an electromagnetic flowmeter, an eleventh pipeline, a sewage discharge pipe and an eighth ball valve from the feed end; a liquid spraying pipe is arranged on the eleventh pipeline in parallel; and a ninth ball valve and a pressure gauge are sequentially arranged on the liquid spraying pipe from the liquid inlet end.

As a further improvement of the utility model, the gas distribution module is installed together with the fifth pipeline by adopting a twelfth pipeline in a butt joint way; the twelfth pipeline is provided with a tenth ball valve, a third electric regulating valve and an air injection pipe in sequence from the air inlet end; and an eleventh ball valve is arranged on the gas ejector pipe.

Compared with the prior art, the utility model has the beneficial effects that: the technical scheme is provided with the mechanized feeder and the mixer, urea is only required to be poured into the storage tank of the overground feeder, a manual crawling ladder is not required for carrying, the safety performance is better, and meanwhile, the raw materials can be crushed and mixed more uniformly by stirring through the mechanized mixer; the technical scheme is provided with the dilution metering module, and the ammonia water and the soft water in the water tank are mixed and diluted by adopting mechanical equipment, so that the ammonia water and the soft water are safer and more accurate compared with manual stirring and proportioning; this technical scheme distribution master module includes two independent liquid distribution modules and gas distribution module, at first separately sets up liquid distribution module and gas distribution module, is convenient for carry liquid and gas transport alone like this and is controlled, secondly is provided with electromagnetic flowmeter in the liquid distribution module, can more accurately know like this and control the injection quantity of liquid, avoids the waste of solution, reduces the generating cost.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

FIG. 2 is an enlarged schematic view of a dilution metering module according to the present invention.

Fig. 3 is an enlarged schematic view of the liquid distribution module of the present invention.

Fig. 4 is an enlarged structural view of the gas distribution module of the present invention.

In the figure: 1. a feeding machine; 2. a mixer; 3. transferring to a storage tank; 4. a urea tank; 5. a water tank; 6. a urea delivery module; 601. a first butterfly valve; 602. a first cartridge filter; 603. a first delivery pump; 604. a second butterfly valve; 7. a water source conveying module; 701. a third butterfly valve; 702. a second cartridge filter; 703. a second delivery pump; 704. a fourth butterfly valve; 8. a dilution metering module; 8001. a sixth pipeline; 8002. a seventh pipe; 8003. a first ball valve; 8004. a second ball valve; 8005. a third cartridge filter; 8006. a third delivery pump; 8007. a first check valve; 8008. a third ball valve; 8009. a fourth ball valve; 8010; an eighth conduit; 8011. a ninth conduit; 8012. a fifth ball valve; 8013. a sixth ball valve; 9. distributing a total module; 10. a liquid dispensing module; 1001. a tenth conduit; 1002. a seventh ball valve; 1003. a first electric control valve; 1004. an electromagnetic flow meter; 1005. an eleventh pipe; 1006. a blow-off pipe; 1007. an eighth ball valve; 1008. a liquid spraying pipe; 1009. a ninth ball valve; 1010. a pressure gauge; 11. a gas distribution module; 1101. a twelfth duct; 1102. a tenth ball valve; 1103. a second electric control valve; 1104. a gas ejector tube; 1105. an eleventh ball valve; 12. a boiler; 13. an air compressor; 14. a first conduit; 15. a second conduit; 16. a third pipeline; 17. a fourth conduit; 18. and a fifth pipeline.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 to 4, the present invention provides a technical solution: a modularized SNCR flue gas denitration system comprises a feeder 1, a mixer 2, a dump tank 3, a urea tank 4, a water tank 5, a urea conveying module 6, a water source conveying module 7, a dilution metering module 8, a distribution main module 9, a liquid distribution module 10, a gas distribution module 11, a boiler 12 and an air compressor 13; the discharge end of the feeder 1 is butted with the feed end of the mixer 2; the discharge end of the mixer 2 is connected with the feed end of the unloading tank 3 by adopting a first pipeline 14; the discharge end of the unloading tank 3 is connected with the feed end of the urea tank 4 and is provided with a second pipeline 15; the discharge end of the urea tank 4 is connected with a third pipeline 16; a urea conveying module 6 and a dilution metering module 8 are sequentially arranged on the third pipeline 16 from the feed end; the water outlet end of the water tank 5 is connected with a fourth pipeline 17; a water source conveying module 7, a dilution metering module 8 and a distribution total module 9 are sequentially arranged on the fourth pipeline 17 from the water inlet end; the discharge end of the dilution metering module 8 is connected with the feed end of the liquid distribution module 10; the air inlet end of the air distribution module 11 is connected to the air outlet end of the air compressor 13 by adopting a fifth pipeline 18; the liquid outlet end of the liquid distribution module 10 and the gas outlet end of the gas distribution module 11 are opposite to the feed inlet of the boiler 12.

The urea conveying module 6 is provided with a first butterfly valve 601, a first cylinder type filter 602, a first conveying pump 603 and a second butterfly valve 604 in sequence from the feeding end; an ammonia water conveying standby pipe 605 is also installed at the feed end of the urea conveying module 6 in a butt joint manner; the water source conveying module 7 is sequentially provided with a third butterfly valve 701, a second cylinder type filter 702, a second conveying pump 703 and a fourth butterfly valve 704 from the water inlet end; the dilution metering module 8 is installed together with a fourth pipeline 17 in a butt joint mode through a sixth pipeline 8001; the dilution metering module 8 is installed in a butt joint mode with the third pipeline 16 through the seventh pipeline 8002; a first ball valve 8003, a second ball valve 8004, a third barrel filter 8005, a third delivery pump 8006, a first check valve 8007, a third ball valve 8008 and a fourth ball valve 8009 are sequentially mounted on the sixth pipeline 8001 and the seventh pipeline 8002 from the feeding end; an eighth pipeline 8010 is connected and installed between the two first ball valves 8003 and the two second ball valves 8004; a ninth pipeline 8011 is connected and installed between the two third ball valves 8008 and the two fourth ball valves 8009; a fifth ball valve 8012 is symmetrically arranged on the eighth pipeline 8010; a sixth ball valve 8013 is symmetrically arranged on the ninth pipeline 8011; a standby second ball valve 8004, a standby third cylinder type filter 8005, a standby third delivery pump 8006 and a standby first check valve 8007 are sequentially mounted between the two fifth ball valves 8012 and the two sixth ball valves 8013 through pipelines; the liquid distribution module 10 is connected with the discharge end of the dilution metering module 8 by adopting a tenth pipeline 1001; a seventh ball valve 1002, a first electric regulating valve 1003, an electromagnetic flow meter 1004, an eleventh pipeline 1005, a drain pipe 1006 and an eighth ball valve 1007 are sequentially arranged on the tenth pipeline 1001 from the feeding end; a liquid spraying pipe 1008 is arranged on the eleventh pipeline 1005 in parallel; a ninth ball valve 1009 and a pressure gauge 1010 are sequentially arranged on the liquid spraying pipe 1008 from the liquid inlet end; the gas distribution module 11 is installed by butting together the twelfth pipe 1101 and the fifth pipe 18; the twelfth pipeline 1101 is provided with a tenth ball valve 1102, a third electric regulating valve 1103 and a gas spraying pipe 1104 in sequence from the gas inlet end; an eleventh ball valve 1105 is mounted on the gas lance 1104.

The working principle and the using process of the utility model are as follows: after the equipment is installed, a power supply is switched on, firstly, a worker pours urea raw materials into a feeder 1 through a forklift, then the feeder 1 conveys the raw materials into a mixer 2 (a water feeding pipeline is switched on inside the mixer) to be mixed, the mixed materials firstly enter a dump tank 3 to be stored, then enter a urea tank 4 and then are conveyed into a dilution metering module 8 through a urea conveying module 6; soft water is stored in the water tank 5, the soft water is conveyed into the dilution metering module 8 through the water source conveying module 7 to be mixed and diluted with urea, the diluted mixed liquid enters the liquid distribution module 10, and finally the liquid distribution module 10 sprays the liquid with the diluted proportion and the gas pressurized by the gas distribution module 11 into the boiler 12 together to perform denitration treatment on emissions (the temperature in the boiler is kept in the temperature range of 850-1200 ℃).

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the utility model. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a modularization SNCR flue gas deNOx systems which characterized in that: the device comprises a feeder (1), a mixer (2), a transfer tank (3), a urea tank (4), a water tank (5), a urea conveying module (6), a water source conveying module (7), a dilution metering module (8), a distribution total module (9), a liquid distribution module (10), a gas distribution module (11), a boiler (12) and an air compressor (13); the discharge end of the feeder (1) is butted with the feed end of the mixer (2); the discharge end of the mixer (2) is connected with the feed end of the unloading tank (3) through a first pipeline (14); the discharge end of the unloading tank (3) is connected with the feed end of the urea tank (4) and provided with a second pipeline (15); the discharge end of the urea tank (4) is connected with a third pipeline (16); a urea conveying module (6) and a dilution metering module (8) are sequentially arranged on the third pipeline (16) from the feed end; the water outlet end of the water tank (5) is connected with a fourth pipeline (17); a water source conveying module (7), a dilution metering module (8) and a distribution total module (9) are sequentially arranged on the fourth pipeline (17) from the water inlet end; the distribution total module (9) comprises a liquid distribution module (10) and a gas distribution module (11); the discharge end of the dilution metering module (8) is connected with the feed end of the liquid distribution module (10); the air inlet end of the air distribution module (11) is connected to the air outlet end of the air compressor (13) through a fifth pipeline (18); the liquid outlet end of the liquid distribution module (10) and the gas outlet end of the gas distribution module (11) are right opposite to the feeding hole of the boiler (12).

2. The modular SNCR flue gas denitration system of claim 1, wherein: the urea conveying module (6) is sequentially provided with a first butterfly valve (601), a first cylinder type filter (602), a first conveying pump (603) and a second butterfly valve (604) from the feed end; and the feed end of the urea conveying module (6) is also provided with an ammonia water conveying standby pipe (605) in a butt joint mode.

3. The modular SNCR flue gas denitration system of claim 1, wherein: the water source conveying module (7) is sequentially provided with a third butterfly valve (701), a second cylinder type filter (702), a second conveying pump (703) and a fourth butterfly valve (704) from the water inlet end.

4. The modular SNCR flue gas denitration system of claim 1, wherein: the dilution metering module (8) is installed together with the fourth pipeline (17) by adopting a sixth pipeline (8001) in an abutting mode; the dilution metering module (8) is mounted together in an abutting joint with the third pipeline (16) by adopting a seventh pipeline (8002); the sixth pipeline (8001) and the seventh pipeline (8002) are sequentially provided with a first ball valve (8003), a second ball valve (8004), a third barrel filter (8005), a third delivery pump (8006), a first check valve (8007), a third ball valve (8008) and a fourth ball valve (8009) from the feeding end; an eighth pipeline (8010) is connected and installed between the two first ball valves (8003) and the two second ball valves (8004); a ninth pipeline (8011) is connected and installed between the two third ball valves (8008) and the two fourth ball valves (8009); a fifth ball valve (8012) is symmetrically arranged on the eighth pipeline (8010); a sixth ball valve (8013) is symmetrically arranged on the ninth pipeline (8011); and a standby second ball valve (8004), a third cylinder type filter (8005), a bottom third delivery pump (8006) and a first check valve (8007) are sequentially arranged between the two fifth ball valves (8012) and the two sixth ball valves (8013) through pipelines.

5. The modular SNCR flue gas denitration system of claim 1, wherein: the liquid distribution module (10) is connected with the discharge end of the dilution metering module (8) by adopting a tenth pipeline (1001); the tenth pipeline (1001) is sequentially provided with a seventh ball valve (1002), a first electric regulating valve (1003), an electromagnetic flowmeter (1004), an eleventh pipeline (1005), a drain pipe (1006) and an eighth ball valve (1007) from the feed end; a liquid spraying pipe (1008) is arranged on the eleventh pipeline (1005) in parallel; and a ninth ball valve (1009) and a pressure gauge (1010) are sequentially arranged on the liquid spraying pipe (1008) from the liquid inlet end.

6. The modular SNCR flue gas denitration system of claim 1, wherein: the gas distribution module (11) is installed together with the fifth pipeline (18) by adopting a twelfth pipeline (1101); the twelfth pipeline (1101) is provided with a tenth ball valve (1102), a third electric regulating valve (1103) and an air injection pipe (1104) in sequence from the air inlet end; and an eleventh ball valve (1105) is arranged on the gas spraying pipe (1104).