CN216604753U - Ultralow-emission SNCR + SCR combined denitration device - Google Patents
Ultralow-emission SNCR + SCR combined denitration device Download PDFInfo
- Publication number
- CN216604753U CN216604753U CN202121670630.1U CN202121670630U CN216604753U CN 216604753 U CN216604753 U CN 216604753U CN 202121670630 U CN202121670630 U CN 202121670630U CN 216604753 U CN216604753 U CN 216604753U
- Authority
- CN
- China
- Prior art keywords
- scr
- sncr
- dilution
- tank
- ammonia
- 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
- 239000007789 gas Substances 0.000 claims abstract description 29
- 238000006243 chemical reaction Methods 0.000 claims abstract description 21
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000003546 flue gas Substances 0.000 claims abstract description 20
- 239000000428 dust Substances 0.000 claims abstract description 13
- 238000010790 dilution Methods 0.000 claims description 47
- 239000012895 dilution Substances 0.000 claims description 47
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 33
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 28
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 27
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 27
- 238000002156 mixing Methods 0.000 claims description 17
- 239000007921 spray Substances 0.000 claims description 13
- 229910021529 ammonia Inorganic materials 0.000 claims description 10
- 210000003437 trachea Anatomy 0.000 claims description 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 12
- 238000010531 catalytic reduction reaction Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 230000009471 action Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000003638 chemical reducing agent Substances 0.000 description 3
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 2
- 239000004202 carbamide Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000003916 acid precipitation Methods 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
Images
Landscapes
- Chimneys And Flues (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The utility model discloses an ultra-low emission SNCR + SCR combined denitration device, which relates to the technical field of denitration devices and comprises a boiler, an SNCR reaction system and an SCR system, wherein a flue gas outlet of the boiler is provided with an economizer, one end of the economizer is communicated with the SNCR reaction system, the flue gas outlet of a hearth is provided with the SCR reaction system, a flue gas outlet of the SCR reactor is provided with a dust remover, and the output end of the dust remover is communicated with a chimney. According to the utility model, SNCR and SCR are combined to carry out denitration treatment on the boiler flue gas, the flue gas is firstly subjected to denitration treatment by the SNCR reaction system, then the completely-denitrated gas enters the SCR reaction system, and then is subjected to denitration treatment for the second time.
Description
Technical Field
The utility model relates to the technical field of denitration devices, in particular to an SNCR (selective non-catalytic reduction) and SCR (selective catalytic reduction) combined denitration device with ultralow emission.
Background
The boiler flue gas usually contains a large amount of nitrogen oxides NOx such as NO, and the nitrogen oxides directly discharged into the atmosphere pollute the air, form photochemical smog and acid rain and are harmful to human health, so the flue gas must be subjected to denitrification (namely denitration) treatment before being discharged. At present, the flue gas denitration technology mainly comprises two types: selective Catalytic Reduction (SCR) and selective non-catalytic reduction denitration (SNCR).
The selective catalytic reduction method is that under the action of a certain temperature and a catalyst, liquid ammonia, ammonia water or urea and the like are used as reducing agents to selectively react with nitrogen oxides in flue gas to generate nontoxic and pollution-free nitrogen and water. The SCR method has the advantages that the reaction temperature is low (300-420 ℃), the denitration efficiency reaches more than 85%, the SCR technology has the advantages of high denitration efficiency and low ammonia escape, but the investment is huge and the operating cost is high.
The selective non-catalytic reduction method is characterized in that a reducing agent (such as ammonia water or urea) containing amino is sprayed into a region with the temperature of a hearth of 800-1100 ℃, the reducing agent is sprayed in an atomizing mode through a spray gun and reacts with nitrogen oxides in smoke to generate pollution-free nitrogen and water, the denitration efficiency is 30-50%, the SNCR technology is low in investment cost and short in construction period, but the denitration efficiency is low.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an SNCR + SCR combined denitration device with ultra-low emission, which aims to solve the problems that the SCR technology provided by the background technology has high denitration efficiency and low ammonia escape, but has huge investment and high running cost, the SNCR technology has low investment cost and short construction period, but has low denitration efficiency.
In order to achieve the above purposes, the technical scheme adopted by the utility model is as follows:
an ultra-low emission SNCR + SCR combined denitration device comprises a boiler, an SNCR reaction system and an SCR system, the position of the flue gas outlet of the boiler is provided with an economizer, one end of the economizer is communicated with an SNCR reaction system, the SNCR reaction system comprises a gas preheater, a hearth, a heater, an ammonia water tank, a dilution water tank, an ammonia water pump, a dilution water pump, a mixing tank, an atomizer and a spray gun, a gas preheater is arranged at the inlet position of the hearth, a heater is arranged in the hearth, an ammonia water pump is arranged at the water pipe in the middle of the ammonia water tank, a dilution water pump is arranged at the water pipe in the middle of the dilution water tank, the ammonia pump and the dilution water pump are both communicated with a mixing tank, the output end of the mixing tank is provided with an atomizer, the output end fixed mounting of atomizer has the spray gun, just spray gun fixed connection is in the inside upper end of furnace.
Preferably, the exhanst gas outlet department of furnace is provided with SCR reaction system, SCR reaction system includes the SCR reactor, ammonia gas jar, dilutes the fan and dilutes the jar, the exhanst gas outlet position department at furnace is established to the SCR reactor, the output tube of ammonia gas jar and dilution fan all passes through trachea and dilutes jar fixed connection, the output and the SCR reactor fixed connection of dilutent jar.
Preferably, a dust remover is arranged at the position of a flue gas outlet of the SCR reactor, and the output end of the dust remover is communicated with a chimney.
Preferably, the gas preheater is fixedly connected with the dilution tank through a gas pipeline.
Compared with the prior art, the utility model provides an SNCR + SCR combined denitration device with ultra-low emission, which has the following beneficial effects:
according to the utility model, SNCR and SCR are combined to carry out denitration treatment on the boiler flue gas, the flue gas is firstly subjected to denitration treatment by the SNCR reaction system, then the completely-denitrated gas enters the SCR reaction system, and then is subjected to denitration treatment for the second time.
Drawings
FIG. 1 is a schematic flow diagram of an ultra-low emission SNCR + SCR combined denitration device according to the present invention;
the reference numbers in the figures are:
1. a boiler; 2. a coal economizer; 3. a gas preheater; 4. a hearth; 5. a heater; 6. an ammonia tank; 7. a dilution water tank; 8. an ammonia pump; 9. a dilution water pump; 10. a mixing tank; 11. an atomizer; 12. a spray gun; 13. an SCR reactor; 14. an ammonia tank; 15. a dilution fan; 16. a dilution tank; 17. a dust remover; 18. and (4) a chimney.
Detailed Description
The following description is presented to disclose the utility model so as to enable any person skilled in the art to practice the utility model. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art.
Referring to fig. 1, an ultra-low emission SNCR + SCR combined denitration device comprises a boiler 1, an SNCR reaction system and an SCR system, wherein an economizer 2 is arranged at a flue gas outlet position of the boiler 1, one end of the economizer 2 is communicated with the SNCR reaction system, the SNCR reaction system comprises a gas preheater 3, a hearth 4, a heater 5, an ammonia water tank 6, a dilution water tank 7, an ammonia water pump 8, a dilution water pump 9, a mixing tank 10, an atomizer 11 and a spray gun 12, a gas preheater 3 is arranged at an inlet position of the hearth 4, the heater 5 is arranged inside the hearth 4, the ammonia water pump 8 is arranged at a water pipe at the middle part of the ammonia water tank 6, the dilution water pump 9 is arranged at a water pipe at the middle part of the dilution water tank 7, the ammonia water pump 8 and the dilution water pump 9 are both communicated with the mixing tank 10, the ammonia water tank 6 conveys ammonia water into the mixing tank 10 through the ammonia water pump 8, and simultaneously the dilution water tank 7 conveys dilution water into the mixing tank 10 through the dilution water pump 9, with aqueous ammonia and dilution water at the inside mixed dilution of blending tank 10, the output of blending tank 10 is provided with atomizer 11, and the output fixed mounting of atomizer 11 has spray gun 12, and spray gun 12 fixed connection is in the inside upper end of furnace 4, and the aqueous ammonia penta-atomization after will mixing the dilution under atomizer 11's effect is spouted to furnace 4 inside and furnace 4 inside gas by spray gun 12 again and is carried out denitration treatment for the first time.
Further, the flue gas outlet of the hearth 4 is provided with an SCR reaction system, the SCR reaction system comprises an SCR reactor 13, an ammonia tank 14, a dilution fan 15 and a dilution tank 16, the SCR reactor 13 is arranged at the flue gas outlet of the hearth 4, the output pipes of the ammonia tank 14 and the dilution fan 15 are fixedly connected with the dilution tank 16 through an air pipe, and the output end of the dilution tank 16 is fixedly connected with the SCR reactor 13.
Specifically, a dust remover 17 is arranged at a flue gas outlet of the SCR reactor 13, an output end of the dust remover 17 is communicated with a chimney 18, and the dust remover 17 removes dust from the denitrated gas and discharges the denitrated gas from the chimney 18.
Specifically, gas heater 3 passes through gas piping and diluter 16 fixed connection, and 16 inside gases preheat, and then make it accelerate the programming rate in 13 insides to improve denitration efficiency.
The working principle and the using process of the utility model are as follows: after the device is installed, when the device is used without errors in inspection, flue gas of a boiler 1 enters a hearth 4 through an economizer 2 and a gas preheater 3, the gas is heated under the action of a heater 5, then ammonia water is conveyed to the inside of a mixing tank 10 through an ammonia water pump 8 by an ammonia water tank 6, dilution water is conveyed to the inside of the mixing tank 10 through a dilution water pump 9 by a dilution water tank 7, the ammonia water and the dilution water are mixed and diluted in the mixing tank 10, the mixed and diluted ammonia water is atomized five times under the action of an atomizer 11, then the mixed and diluted ammonia water is sprayed to the inside of the hearth 4 and the gas in the hearth 4 by a spray gun 12 for primary denitration treatment, the gas which completes the primary denitration enters an SCR reactor 13, an ammonia gas tank 14 conveys the ammonia gas to the inside of a dilution tank 16, and the air is conveyed to the inside of the dilution tank 16 under the action of a dilution fan 15, so that the ammonia gas is diluted and conveyed to the inside of the SCR reactor 13 for secondary denitration treatment, because gas preheater 3 and dilution tank 16 intercommunication, and then preheat the inside gas of dilution tank 16, and then make it accelerate the programming rate in SCR reactor 13 inside to improve denitration efficiency, dust remover 17 removes dust to the gas after the denitration and handles, discharges from chimney 18 again, has not only improved denitration efficiency, and has reduced running cost.
The foregoing shows and describes the general principles, essential features, and advantages of the utility model. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the utility model, but that various changes and modifications may be made without departing from the spirit and scope of the utility model, which fall within the scope of the utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.
Claims (4)
1. The utility model provides an ultra-low emission SNCR + SCR unites denitrification facility, includes boiler (1), SNCR reaction system and SCR system, its characterized in that: the boiler is characterized in that an economizer (2) is arranged at the position of a flue gas outlet of the boiler (1), one end of the economizer (2) is communicated with an SNCR reaction system, the SNCR reaction system comprises a gas preheater (3), a hearth (4), a heater (5), an ammonia water tank (6), a dilution water tank (7), an ammonia water pump (8), a dilution water pump (9), a mixing tank (10), an atomizer (11) and a spray gun (12), the inlet position of the hearth (4) is provided with the gas preheater (3), the heater (5) is arranged inside the hearth (4), the ammonia water pump (8) is arranged at the water pipe at the middle part of the ammonia water tank (6), the dilution water pump (9) is arranged at the water pipe at the middle part of the dilution water tank (7), the ammonia water pump (8) and the dilution water pump (9) are both communicated with the mixing tank (10), the atomizer (11) is arranged at the output end of the mixing tank (10), the output end of the atomizer (11) is fixedly provided with a spray gun (12), and the spray gun (12) is fixedly connected to the upper end of the inner part of the hearth (4).
2. The SNCR + SCR combined denitration device as claimed in claim 1, wherein: the utility model discloses a furnace, including furnace (4), SCR reactor (13), ammonia jar (14), dilution fan (15) and dilution tank (16), SCR reactor (13) is established in the exhanst gas outlet position department of furnace (4), the output tube of ammonia jar (14) and dilution fan (15) all passes through trachea and dilution tank (16) fixed connection, the output and SCR reactor (13) fixed connection of dilution tank (16).
3. The SNCR + SCR combined denitration device as claimed in claim 2, wherein: a dust remover (17) is arranged at the position of a flue gas outlet of the SCR reactor (13), and the output end of the dust remover (17) is communicated with a chimney (18).
4. The SNCR + SCR combined denitration device as claimed in claim 1, wherein: the gas preheater (3) is fixedly connected with the dilution tank (16) through a gas pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121670630.1U CN216604753U (en) | 2021-07-22 | 2021-07-22 | Ultralow-emission SNCR + SCR combined denitration device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121670630.1U CN216604753U (en) | 2021-07-22 | 2021-07-22 | Ultralow-emission SNCR + SCR combined denitration device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216604753U true CN216604753U (en) | 2022-05-27 |
Family
ID=81681856
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121670630.1U Active CN216604753U (en) | 2021-07-22 | 2021-07-22 | Ultralow-emission SNCR + SCR combined denitration device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216604753U (en) |
-
2021
- 2021-07-22 CN CN202121670630.1U patent/CN216604753U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN205598926U (en) | Circulating fluidized bed boiler flue gas SNCR and SCR coupling denitrification facility | |
| CN203935782U (en) | MSW Incineration Plant low-temperature SCR equipment for denitrifying flue gas | |
| CN210814723U (en) | High-temperature dust removal, desulfurization and denitrification device for cement kiln | |
| CN205627636U (en) | Be applied to SCR flue gas denitration's reductant preparation mixing arrangement | |
| CN206064121U (en) | A kind of SNCR denitration system | |
| CN106705091B (en) | A kind of system and method for slowing down SCR catalyst inactivation and air preheater and blocking | |
| CN105080314A (en) | SNCR (selective non-catalytic reduction) and ozone flue gas denitrification device | |
| CN103611411A (en) | Dry denitration processing device in furnace | |
| CN110433622A (en) | A kind of smoke gas comprehensive treatment system and method for ozone oxidation collaboration | |
| CN212576008U (en) | Purification device for removing SNCR and SCR escaped ammonia | |
| CN205308112U (en) | Ozone and device of air in coordination with nitrogen oxide in oxidation flue gas | |
| CN216604753U (en) | Ultralow-emission SNCR + SCR combined denitration device | |
| CN211799959U (en) | Ammonia SNCR (Selective non catalytic reduction) denitration system for tower boiler | |
| CN208542022U (en) | Incineration flue gas non-catalytic reduction denitrating system based on high concentration reducing agent | |
| CN102698600A (en) | System for intelligently controlling flue gas denitrification of cement plant based on selective catalytic reduction (SCR) method | |
| CN208720184U (en) | A kind of waste heat boiler of nitrogen oxides minimum discharge | |
| CN110026082A (en) | A kind of ozone injects the kiln gas denitrification apparatus and method of auxiliary SCR before ammonia | |
| CN204973512U (en) | Improved generation SNCR+ ozone flue gas denitration device | |
| CN208356476U (en) | A kind of low-temperature flue gas redox denitrating system | |
| CN111359396A (en) | Coke oven flue gas semi-dry ammonia desulfurization process | |
| CN112354337A (en) | High-efficient SOx/NOx control of low temperature flue gas takes off white integration equipment | |
| CN204891592U (en) | System for can improve SNCR reduction efficiency | |
| CN212576007U (en) | External denitration system | |
| CN216987031U (en) | Boiler denitration system | |
| CN203620511U (en) | Treating device of furnace dry method denitration |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A ultra-low emission SNCR+SCR combined denitrification device Granted publication date: 20220527 Pledgee: China Construction Bank Corporation Quyang Branch Pledgor: Hebei Wanpeng Environmental Protection Engineering Co.,Ltd. Registration number: Y2024980016861 |