CN212492409U - SNCR and low temperature SCR coupling flue gas denitration system - Google Patents
SNCR and low temperature SCR coupling flue gas denitration system Download PDFInfo
- Publication number
- CN212492409U CN212492409U CN202021247484.7U CN202021247484U CN212492409U CN 212492409 U CN212492409 U CN 212492409U CN 202021247484 U CN202021247484 U CN 202021247484U CN 212492409 U CN212492409 U CN 212492409U
- Authority
- CN
- China
- Prior art keywords
- flue gas
- temperature scr
- flue
- spray gun
- low
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Chimneys And Flues (AREA)
- Treating Waste Gases (AREA)
Abstract
The utility model discloses a SNCR and low temperature SCR coupling flue gas denitration system, including the afterbody flue, flue gas heater, low temperature SCR reactor, main spray gun and ammonia tank, wherein, the main spray gun passes through ammonia pump and ammonia tank exit linkage, the main spray gun sets up in the preceding flue of afterbody flue, the main spray gun is used for spouting the aqueous ammonia in the flue forward, carry out the SNCR reaction, the exhanst gas outlet of afterbody flue is connected with flue gas heater's flue gas inlet, flue gas heater's exhanst gas outlet links to each other with the flue gas import of low temperature SCR reactor, low temperature SCR reactor is used for utilizing the escape ammonia in the SNCR reaction to carry out low temperature SCR reaction as the denitration reductant, SNCR and low temperature SCR technology coupling denitration under lower smoke temperature, realize that full operating mode NOx discharges up to standard; the utility model discloses can practice thrift the denitration cost, have certain flexibility and reliability to the system device is simple, boiler body transformation volume is little, easily realizes promoting.
Description
Technical Field
The utility model belongs to the technical field of the environmental protection is administered in the atmosphere pollution, in particular to SNCR and low temperature SCR coupling flue gas denitration system.
Background
With the increasing improvement of the economy and living standard of China, people will pay more and more attention to the environment. Environmental pollution caused by industrial production mainly using coal is a restriction factor of industrial development in China, and tail gas generated by coal combustion contains smoke dust and sulfur dioxide (SO)2) Nitrogen Oxide (NO)x) And carbon dioxide (CO)2) And the pollutants and the greenhouse gases cause serious environmental problems, and are important problems to be solved urgently in the economic sustainable development of China. At present, the main means for controlling NOx emission of coal-fired boilers of power stations, boilers for burning biomass and domestic garbage and industrial boilers/kilns are low-nitrogen combustion and SCR (selective catalytic reduction) in boilersSelective catalytic reduction) denitration technology, SNCR (selective non-catalytic reduction) denitration technology, and the like. The SNCR process system is simple, the investment cost is low, but the denitration efficiency is low due to the reaction conditions; SCR denitration process denitration efficiency is high but the system is complicated, investment cost is high, and when being applied to old boiler transformation, often because SCR reaction temperature condition, arrange the not enough scheduling problem in space, need to reform transform boiler afterbody heating surface and flue, the work load is big and investment cost further improves, and because flue gas temperature level is lower when boiler low-load operating mode, denitration efficiency is difficult to satisfy, NOx concentration satisfies the environmental protection standard when guaranteeing flue gas emission, realize the ultralow emission, need the utility model new technological means.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problem, the utility model provides a SNCR and low temperature SCR coupling flue gas denitration system improves denitration efficiency, realizes the ultralow emission of full operating mode NOx.
The utility model provides a pair of SNCR and low temperature SCR coupling flue gas deNOx systems, including afterbody flue, flue gas heater, low temperature SCR reactor, main spray gun and ammonia tank, wherein, main spray gun passes through ammonia water pump and ammonia tank exit linkage, main spray gun sets up in the preceding flue of afterbody flue, main spray gun be used for to spout the aqueous ammonia in the preceding flue, carry out the SNCR reaction, the exhanst gas outlet of afterbody flue and flue gas heater's flue gas access connection, flue gas heater's exhanst gas outlet links to each other with the flue gas import of low temperature SCR reactor, low temperature SCR reactor is arranged in utilizing the escape ammonia in the SNCR reaction to carry out the low temperature SCR reaction as the denitration reductant.
Further, a first ammonia water valve and a first ammonia water check valve are arranged between the ammonia water tank and the ammonia water pump; the air inlet of the main spray gun is connected with the air outlet of the air compressor, and a compressed air valve is arranged between the main spray gun and the air compressor; the main spray gun is connected with an air outlet of the primary air fan, and the cooling air outlet is used for sending cold air generated by the primary air fan out of the main spray gun.
Furthermore, the main spray gun, the first ammonia water valve, the first ammonia water check valve and the ammonia water pump are all made of corrosion-resistant materials.
Further, a dust remover and an induced draft fan are arranged between the tail flue and the low-temperature SCR reactor, a flue gas outlet of the tail flue is connected with a flue gas inlet of the dust remover, a flue gas outlet of the dust remover is connected with a flue gas inlet of the induced draft fan, and the dust remover is used for removing smoke dust in flue gas; the outlet of the induced draft fan is connected with the flue gas inlet of the flue gas heater, the flue gas outlet of the flue gas heater is connected with the flue gas inlet of the low-temperature SCR reactor, and the flue gas heater is used for ensuring the temperature level of flue gas; and a flue gas outlet of the flue gas of the low-temperature SCR reactor is connected with a chimney.
Furthermore, a superheater and an air preheater are arranged in the tail flue, an outlet of the superheater is connected with a steam inlet of the flue gas heater through a steam distribution valve, a steam outlet of the flue gas heater is connected with a condenser, and the condenser is used for recovering steam resources; the air preheater is connected with an air outlet of the primary air fan and is used for heating primary cold air generated by the primary air fan.
Furthermore, the outlet of the superheater is connected with the steam inlet of a steam turbine through a steam distribution valve, the steam outlet of the steam turbine is connected with a condenser, and the steam turbine is also connected with a generator.
Furthermore, an auxiliary spray gun is arranged in a front flue of the low-temperature SCR reactor, the auxiliary spray gun is connected with an outlet of an ammonia water tank through an auxiliary ammonia water pump, and a second ammonia water valve and a second ammonia water check valve are arranged between the auxiliary spray gun and the ammonia water tank; the auxiliary spray gun is characterized in that an air inlet of the auxiliary spray gun is connected with an air outlet of the auxiliary air compressor, an auxiliary compression air valve is arranged between the auxiliary spray gun and the auxiliary air compressor, and the auxiliary spray gun is used for spraying ammonia to supplement a denitration reducing agent into the low-temperature SCR reactor.
Further, the auxiliary spray gun, the second ammonia valve, the second ammonia check valve and the auxiliary ammonia pump are all made of corrosion-resistant materials.
Furthermore, a catalyst is arranged in the low-temperature SCR reactor, the arrangement plane of the catalyst is perpendicular to the flow direction of flue gas, and the catalyst needs to be arranged in a vertical flue.
The utility model provides a SNCR and low temperature SCR coupling flue gas denitration system's application method does, including the aqueous ammonia in the aqueous ammonia case through the ammonia pump entering main spray gun, the air enters main spray gun after air compressor compression, compressed air atomizes the aqueous ammonia and sprays into the front flue of afterbody flue from main spray gun, carries out the SNCR reaction, and the main spray gun is connected to the primary air fan export, the primary air fan is used for sending out cold wind cooling main spray gun; a superheater is arranged in the tail flue, and a steam outlet of the superheater is connected with a steam inlet of the flue gas heater; flue gas subjected to SNCR reaction enters a dust remover from an outlet of a tail flue to remove smoke dust, the flue gas subjected to smoke dust removal is introduced to a flue gas heater by an induced draft fan, the flue gas entering the flue gas heater exchanges heat with steam from the heater to absorb heat, the heated flue gas enters a low-temperature SCR reactor, escaped ammonia escaping from the SNCR reaction is used as a denitration reducing agent to carry out low-temperature SCR reaction, and NOx in the flue gas is reduced to N2(ii) a When the escaped ammonia is insufficient, the ammonia water in the ammonia water tank enters an auxiliary spray gun through an auxiliary ammonia water pump, air enters the auxiliary spray gun after being compressed by an auxiliary air compressor, the compressed air atomizes the ammonia water and then sprays the ammonia water into the low-temperature SCR reactor from the auxiliary spray gun to carry out auxiliary ammonia spraying, and NOx in the flue gas is reduced into N2(ii) a Reduced N2And discharging the waste gas through a chimney connected with a smoke outlet of the low-temperature SCR reactor.
Compared with the prior art, the utility model discloses following beneficial effect has at least:
the SNCR and low-temperature SCR coupled denitration system provided by the utility model can effectively ensure that the NOx concentration at the outlet of the chimney reaches the standard under the full working condition; due to the arrangement of the low-temperature SCR reactor, the denitration system is not influenced by the combustion working condition of the boiler, and can control the emission of NOx in flue gas at the initial starting stage of the boiler and during the load lifting, so that the ultralow emission of the NOx under the full working condition is realized.
Further, the utility model provides a SNCR and low temperature SCR coupling deNOx systems, the SNCR denitration reaction that takes place in the flue before utilizing the afterbody flue at first carries out preliminary desorption to NOx, then lets in the escape ammonia of SNCR denitration reaction and carries out further denitration in the low temperature SCR reactor, and this system operation is nimble reliable to the denitration cost has been practiced thrift.
Further, the utility model discloses be provided with supplementary spray gun in low temperature SCR reactor department, when the escape ammonia is not enough, can launch supplementary spray gun and assist and spout the ammonia, supply and carry out required denitration reductant during the low temperature SCR reaction, guaranteed that the flue gas that lets in the low temperature SCR reactor can carry out abundant denitration reaction.
Furthermore, the utility model is connected with a steam turbine and a flue gas heater through a steam distribution valve respectively behind the superheater, wherein the steam turbine is connected with a generator, when the steam flows through the steam turbine to do work by expansion, the generator is driven to rotate to generate power, thereby realizing multiple-effect utilization of energy, and the steam after doing work is led out from a steam outlet of the steam turbine to enter a condenser for condensation; after the steam in the flue gas heater heats the flue gas, the steam is introduced into the condenser from the steam outlet of the flue gas heater, and the condenser plays a role in recovering steam resources.
Further, the utility model discloses in adjust the flue gas heat absorption capacity through the steam flow who adjusts entering flue gas heater, change the flue gas temperature, increase vapor volume during the low-load reduces vapor volume even and closes the export of vapor distribution valve in the flue gas heater direction during the high load, has guaranteed the flue gas temperature level, has ensured low temperature SCR denitration device's denitration efficiency, utilizes the steam that the over heater produced as the heat source simultaneously, need not additionally to input the heat source, and system economy is better.
Furthermore, in the utility model, the low-temperature SCR device is arranged behind the dust remover, and the dust concentration of the flue gas flowing through the SCR device is low, so that the dust deposition and the catalyst poisoning phenomena of the low-temperature SCR reactor are reduced, and the service life of the catalyst is prolonged; furthermore, the utility model discloses set up low temperature SCR equipment behind air heater, consequently be favorable to avoiding the SO that SCR catalyst catalysis generated3Causing ammonium bisulfate blockage and corrosion problems in the air preheater.
Further, the utility model discloses catalyst in the well low temperature SCR reactor arranges the plane and must arrange perpendicularly with the flue gas flow direction, and the catalyst needs to arrange in vertical flue to avoid the catalyst to arrange when horizontal flue because the catalyst deposition that inertia caused blocks up the scheduling problem, improved the live time of catalyst, prolonged unit operating cycle.
Drawings
FIG. 1 is a SNCR and low-temperature SCR coupled flue gas denitration system;
wherein, 1 represents a tail flue; 2 denotes a superheater; 3 denotes a steam distribution valve; 4 denotes a steam turbine; 5 denotes a generator; 6 denotes a condenser; 7 denotes a dust remover; 8 denotes an induced draft fan; 9 denotes a flue gas heater; 10 denotes a low temperature SCR reactor; 11 denotes a chimney; 121 denotes a second ammonia valve; 131 denotes a second ammonia check valve; 122 denotes an auxiliary compressed air valve; 123 denotes a first ammonia valve; 132 denotes a first ammonia check valve; 124, a compressed air valve; 141 auxiliary ammonia pump; 142 denotes an auxiliary air compressor; 143 denotes an ammonia pump; 144 denotes an air compressor; 151 denotes an auxiliary lance; 152 denotes a main lance; 16 denotes an ammonia tank; 17 denotes a primary air fan; 18 denotes a cool air distribution valve; and 19 denotes an air preheater.
Detailed Description
The following describes the SNCR coupling low temperature SCR flue gas denitration system and the using method thereof in detail with reference to the attached drawings.
The utility model provides a SNCR coupling low temperature SCR flue gas denitration system, wherein, main spray gun 152 is connected with 16 exports of ammonia water tank through ammonia water pump 143, is provided with first aqueous ammonia valve 123 and first aqueous ammonia check valve 132 between ammonia water tank 16 and ammonia water pump 143; the air inlet of the main spray gun 152 is connected with the air outlet of the air compressor 144, and the compressed air channel is provided with a compressed air valve 124; the main spray gun 152 is connected with an air outlet of the primary air fan 17 through a cold air distribution valve 18, the cold air distribution valve 18 is provided with a cooling air outlet, and the cooling air outlet is used for sending cold air generated by the primary air fan out of the main spray gun 152;
further, the main spray gun 152 is arranged in a front flue of the tail flue 1, ammonia water is sprayed into the front flue by the main spray gun 152, and the ammonia water and the flue gas in the front flue perform SNCR reaction;
the utility model discloses in the middle afterbody flue 1 upper portion be provided with over heater 2, the lower part is provided with air heater 19, the export of over heater 2 is connected with the steam inlet of flue gas heater 9 through steam distribution valve 3, the steam outlet of flue gas heater 9 is connected with condenser 6, condenser 6 is used for retrieving steam resource; the air preheater 19 is connected with an air outlet of the primary air fan 17 through the cold air distribution valve 18, the cold air distribution valve 18 is further provided with a primary cold air outlet, primary cold air generated by the primary air fan 17 is introduced into the air preheater 19 through the primary cold air outlet of the cold air distribution valve 18, and the primary cold air is heated by the air preheater 19.
Further, the outlet of the superheater 2 is connected with the steam inlet of a steam turbine 4 through a steam distribution valve 3, the steam outlet of the steam turbine 4 is connected with a condenser 6, and the steam turbine 4 is also connected with a generator 5.
The flue gas outlet of the middle tail flue 1 of the utility model is connected with the flue gas inlet of the dust remover 7, the flue gas outlet of the dust remover 7 is connected with the flue gas inlet of the draught fan 8, and the dust remover 7 can remove the smoke dust in the flue gas; the outlet of the induced draft fan 8 is connected with the flue gas inlet of the flue gas heater 9, the flue gas outlet of the flue gas heater 9 is connected with the flue gas inlet of the low-temperature SCR reactor 10, the low-temperature SCR reactor 10 utilizes escaped ammonia in SNCR reaction generated in the front flue of the tail flue as a denitration reducing agent to carry out low-temperature SCR reaction, the flue gas outlet of the flue gas of the low-temperature SCR reactor 10 is connected with the chimney 11, and the flue gas after denitration is discharged out of a flue gas denitration system.
The utility model discloses still set up supplementary spray gun 151 in the front flue of well low temperature SCR reactor 10, supplementary spray gun 151 is connected with the export of ammonia water tank 16 through supplementary ammonia pump 141, is provided with second ammonia valve 121 and second ammonia check valve 131 between supplementary spray gun 151 and ammonia water tank 16; an air inlet of the auxiliary spray gun 151 is connected with an air outlet of the auxiliary air compressor 142, an auxiliary compressed air valve 122 is arranged on an auxiliary compressed air channel, and when the escaped ammonia in the SNCR reaction generated in the front flue of the tail flue is insufficient, the ammonia can be sprayed into the low-temperature SCR reactor 10 through the auxiliary spray gun 151 to supplement the denitration reducing agent.
Further, a catalyst is arranged in the low-temperature SCR reactor 10, the arrangement plane of the catalyst is perpendicular to the flow direction of the flue gas, and the catalyst is arranged in the vertical flue.
The utility model provides a SNCR and low temperature SCR coupling flue gas deNOx systems's application method does, the aqueous ammonia in the ammonia water tank 16 gets into main spray gun 152 through ammonia pump 143, the air lets in main spray gun 152 after air compressor 144 compresses, compressed air sprays into the preceding flue of afterbody flue 1 from main spray gun 152 after with the aqueous ammonia atomizing in, the flue gas in the preceding flue of atomizing aqueous ammonia and afterbody flue 1 carries out the SNCR reaction, the main spray gun 152 is connected in the export of primary air fan 17, primary air fan 17 sends out cold wind cooling main spray gun 152; a superheater 2 and an air preheater 19 are arranged in the tail flue 1, and a steam outlet of the superheater 2 is connected with a steam inlet of the flue gas heater 9; flue gas subjected to SNCR reaction in a front flue of a tail flue enters a dust remover 7 from an outlet of the tail flue 1 to remove smoke dust, the flue gas subjected to smoke dust removal is introduced to a flue heater 9 by an induced draft fan 8, the flue gas entering the flue heater 9 and steam from a heater 2 exchange heat to absorb heat, the heated flue gas enters a low-temperature SCR reactor 10 to be subjected to low-temperature SCR reaction, the low-temperature SCR reactor 10 utilizes escaped ammonia escaping from the SNCR reaction in the front flue of the tail flue as a denitration reducing agent to carry out low-temperature SCR reaction, and NOx in the flue gas in the SCR reactor 10 is reduced to N2(ii) a When the escaped ammonia is insufficient, the ammonia water in the ammonia water tank 16 enters the auxiliary ammonia water pipeline through the auxiliary ammonia water pump 141 and then enters the auxiliary spray gun 151, the air is compressed by the auxiliary air compressor 142 and then enters the auxiliary spray gun 151 through the compressed air pipeline, the compressed air atomizes the ammonia water and then sprays the ammonia water from the auxiliary spray gun 151 into the low-temperature SCR reactor 10 for auxiliary ammonia spraying, and NOx in the flue gas is reduced to N2(ii) a Reduced N2And is discharged through a chimney 11 connected with a flue gas outlet of the low-temperature SCR reactor 10.
As shown in fig. 1, the specific denitration method in this embodiment is as follows:
in the embodiment, ammonia water in an ammonia water tank enters a main spray gun through an ammonia water pump, air enters the main spray gun after being compressed by an air compressor, the compressed air atomizes the ammonia water and then sprays the atomized ammonia water into a front flue of a tail flue 1 to perform SNCR (selective non-catalytic reduction) reaction, an outlet of a primary fan is connected with an inlet of a cold air distribution valve, a cooling air outlet of the cold air distribution valve is connected with a cooling air channel of the main spray gun, and the primary fan is used for sending out cold air to cool the main spray gun due to higher smoke temperature;
here, the SNCR denitration reaction equation is:
4NH3+4NO+O2→4N2+6H2O
4NH3+2NO+2O2→3N2+6H2O
8NH3+6NO2→7N2+12H2O
a superheater is arranged in the tail flue, and a steam outlet of the superheater is connected with a steam inlet of the flue gas heater; flue gas after SNCR reaction enters a dust remover from an outlet of a tail flue to remove smoke dust, the flue gas after the smoke dust removal is introduced to a flue gas heater by an induced draft fan, the flue gas and steam from the heater exchange heat to absorb heat, the heated flue gas enters a low-temperature SCR reactor, escaping ammonia which escapes from the SNCR reaction without reaction is used as a denitration reducing agent to carry out selective catalytic reduction reaction in the low-temperature SCR reactor, and NOx in the flue gas is reduced to N2(ii) a When the escaped ammonia is insufficient, ammonia water and compressed air enter the auxiliary spray gun, the compressed air atomizes the ammonia water and then sprays the atomized ammonia water into the low-temperature SCR reactor from the auxiliary spray gun for auxiliary ammonia spraying, and NOx in the flue gas is reduced to N2；
The SCR denitration reaction equation occurring in the low-temperature SCR reactor is as follows:
n produced by denitration reaction2Discharging through a chimney connected with a flue gas outlet of the low-temperature SCR reactor;
the outlet of the superheater is also connected with the steam inlet of the steam turbine through a steam distribution valve, the steam flows through the steam turbine to perform expansion work to drive the generator to rotate for power generation, the worked steam is led out from the steam outlet of the steam turbine to enter the condenser for condensation, and steam resources are recovered.
The utility model discloses used denitrifier is the aqueous ammonia, actually also can replace the aqueous ammonia for urea solution.
The utility model discloses well first aqua ammonia valve, second aqua ammonia valve, first aqua ammonia check valve, second aqua ammonia check valve, aqua ammonia pump, supplementary aqua ammonia pump, main spray gun and supplementary spray gun are made by corrosion-resistant material, and the material includes but is not limited to stainless steel 316L.
Claims (9)
1. The SNCR and low-temperature SCR coupled flue gas denitration system is characterized by comprising a tail flue (1), a flue gas heater (9), a low-temperature SCR reactor (10), a main spray gun (152) and an ammonia water tank (16), wherein the main spray gun (152) is connected with an outlet of the ammonia water tank (16) through an ammonia water pump (143), the main spray gun (152) is arranged in a front flue of the tail flue (1), and the main spray gun (152) is used for spraying ammonia water into the front flue to perform SNCR reaction; the flue gas outlet of the tail flue (1) is connected with the flue gas inlet of the flue gas heater (9), the flue gas outlet of the flue gas heater (9) is connected with the flue gas inlet of the low-temperature SCR reactor (10), and the low-temperature SCR reactor (10) is used for carrying out low-temperature SCR reaction by using escaped ammonia in SNCR reaction as a denitration reducing agent.
2. The SNCR and low-temperature SCR coupled flue gas denitration system according to claim 1, wherein a first ammonia water valve (123) and a first ammonia water check valve (132) are arranged between the ammonia water tank (16) and the ammonia water pump (143); the air inlet of the main spray gun (152) is connected with the air outlet of the air compressor (144), and a compressed air valve (124) is arranged between the main spray gun (152) and the air compressor (144); the main spray gun (152) is connected with an air outlet of a primary air fan (17), and the primary air fan is used for sending the generated cold air out of the main spray gun (152) for cooling.
3. The SNCR and low-temperature SCR coupled flue gas denitration system according to claim 2, wherein the main lance (152), the first ammonia water valve (123), the first ammonia water check valve (132) and the ammonia water pump (143) are all made of corrosion-resistant materials.
4. The SNCR and low-temperature SCR coupled flue gas denitration system according to claim 1, wherein a dust remover (7) and an induced draft fan (8) are further arranged between the tail flue (1) and the low-temperature SCR reactor (10), a flue gas outlet of the tail flue (1) is connected with a flue gas inlet of the dust remover (7), a flue gas outlet of the dust remover (7) is connected with a flue gas inlet of the induced draft fan (8), and the dust remover (7) is used for removing smoke dust in flue gas; an outlet of the induced draft fan (8) is connected with a flue gas inlet of a flue gas heater (9), a flue gas outlet of the flue gas heater (9) is connected with a flue gas inlet of a low-temperature SCR reactor (10), and the flue gas heater (9) is used for ensuring the temperature level of flue gas; and a flue gas outlet of the flue gas of the low-temperature SCR reactor (10) is connected with a chimney (11).
5. The SNCR and low-temperature SCR coupled flue gas denitration system according to claim 1, wherein a superheater (2) and an air preheater (19) are arranged in the tail flue (1), an outlet of the superheater (2) is connected with a steam inlet of the flue gas heater (9) through a steam distribution valve (3), a steam outlet of the flue gas heater (9) is connected with a condenser (6), and the condenser (6) is used for recovering steam resources; the air preheater (19) is connected with an air outlet of the primary air fan (17), and the air preheater (19) is used for heating primary cold air generated by the primary air fan (17).
6. An SNCR and low-temperature SCR coupled flue gas denitration system according to claim 5, wherein the outlet of the superheater (2) is further connected with the steam inlet of a steam turbine (4) through a steam distribution valve (3), the steam outlet of the steam turbine (4) is connected with a condenser (6), and the steam turbine (4) is further connected with a generator (5).
7. The SNCR and low-temperature SCR coupled flue gas denitration system according to claim 1, wherein an auxiliary spray gun (151) is arranged in a front flue of the low-temperature SCR reactor (10), the auxiliary spray gun (151) is connected with an outlet of an ammonia water tank (16) through an auxiliary ammonia water pump (141), and a second ammonia water valve (121) and a second ammonia water check valve (131) are arranged between the auxiliary spray gun (151) and the ammonia water tank (16); an air inlet of the auxiliary spray gun (151) is connected with an air outlet of the auxiliary air compressor (142), an auxiliary compressed air valve (122) is arranged between the auxiliary spray gun (151) and the auxiliary air compressor (142), and the auxiliary spray gun (151) is used for spraying ammonia into the low-temperature SCR reactor (10) to supplement denitration reducing agents.
8. The SNCR and low-temperature SCR coupled flue gas denitration system according to claim 7, wherein the auxiliary lance (151), the second ammonia valve (121), the second ammonia check valve (131), and the auxiliary ammonia pump (141) are all made of corrosion-resistant materials.
9. The SNCR and low-temperature SCR coupled flue gas denitration system according to claim 1, wherein a catalyst is arranged in the low-temperature SCR reactor (10), the arrangement plane of the catalyst is perpendicular to the flow direction of flue gas, and the catalyst needs to be arranged in a vertical flue.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021247484.7U CN212492409U (en) | 2020-06-30 | 2020-06-30 | SNCR and low temperature SCR coupling flue gas denitration system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021247484.7U CN212492409U (en) | 2020-06-30 | 2020-06-30 | SNCR and low temperature SCR coupling flue gas denitration system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212492409U true CN212492409U (en) | 2021-02-09 |
Family
ID=74432487
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021247484.7U Active CN212492409U (en) | 2020-06-30 | 2020-06-30 | SNCR and low temperature SCR coupling flue gas denitration system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212492409U (en) |
-
2020
- 2020-06-30 CN CN202021247484.7U patent/CN212492409U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201524525U (en) | SCR flue gas denitrating device | |
| CN104190253A (en) | Coke oven flue gas SCR denitration system | |
| CN101898086A (en) | Power-generation and denitrification integrated device by residual heat of glass furnace and method thereof | |
| CN204073849U (en) | Coke oven flue gas SCR denitration system | |
| CN101907406A (en) | Flue gas utilization and treatment system for industrial stoves | |
| CN106705091B (en) | A kind of system and method for slowing down SCR catalyst inactivation and air preheater and blocking | |
| CN217016043U (en) | Flue gas treatment system | |
| CN109731472B (en) | Energy-saving boiler flue gas purification system and method | |
| CN108392956A (en) | A kind of system for desulfuration and denitration and method for coke oven flue gas | |
| CN214319745U (en) | Device for treating CO and nitrogen oxide at tail end of flue gas of sintering machine | |
| CN202527063U (en) | Combined type flue gas denitrification device based on urea solution or ammonia water | |
| CN104329946A (en) | Waste gas denitration and residual heat recovery integral system for coke oven flue | |
| CN212492330U (en) | Active coke combined desulfurization and denitrification system based on pre-oxidation | |
| CN103223294A (en) | Method and system for removing coal-fired boiler pollutants by utilizing solar energy | |
| CN113209823A (en) | Low-temperature SCR denitration device and process for waste gas from nonferrous metal Kaldo furnace smelting | |
| CN212492409U (en) | SNCR and low temperature SCR coupling flue gas denitration system | |
| CN111804138A (en) | Biomass boiler flue gas denitration system and application process thereof | |
| CN201764834U (en) | Utilization and treatment device for industrial kiln fume | |
| CN201754034U (en) | Comprehensive treatment system for glass furnace flue gas | |
| CN110935313A (en) | Segmented desulfurization and denitrification method and device for sintering flue gas of vertical cold kiln concurrent heating furnace | |
| CN105597533A (en) | Device for denitration heating blend technology | |
| CN202860383U (en) | SCR flue gas denitrating device for garbage incinerator | |
| CN215233222U (en) | Removal system for ultralow emission of nitric oxides of household garbage incinerator | |
| CN206229169U (en) | The system for desulfuration and denitration of flue gases of cock oven | |
| CN205613280U (en) | A device that is used for muddy thermal technology of denitration to plant |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |