CN104785092A - An SNCR flue gas denitration device - Google Patents
An SNCR flue gas denitration device Download PDFInfo
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- CN104785092A CN104785092A CN201410846859.4A CN201410846859A CN104785092A CN 104785092 A CN104785092 A CN 104785092A CN 201410846859 A CN201410846859 A CN 201410846859A CN 104785092 A CN104785092 A CN 104785092A
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- pump
- boiler
- urea
- flue gas
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Abstract
An SNCR flue gas denitration device is disclosed. The denitration device is characterized in that a material hopper (2) is connected to an injection pump (4) through a feeder (3); one end of the injection pump (4) is connected to a blower fan (5), and the other end is connected to a urea storage bin (6); the urea storage bin (6) is connected to a material blending tank (8) through an electronic scale (7); the material blending tank (8) is connected to a urea solution storage tank (10) through a material conveying pump; the urea solution storage tank (10) is connected to spray guns (13) in a boiler (12) through a solution pump (11); a solution pumped by the solution pump (11) is diluted by a diluting water pump (16); and a furnace chamber (14) of the boiler (12) is communicated with a gas collecting pump (1). The denitration device is low in boiler transformation, low in occupied space, fully automatic in control, safe, reliable and low in running cost, has a denitration efficiency of 50-65%, and reduces environment pollution.
Description
Technical field
The invention belongs to flue gas denitrification equipment technical field, be specifically related to a kind of SNCR equipment for denitrifying flue gas.
Background technology
Nitrogen oxide (NOx) is main atmosphere pollution, mainly comprises NO, NO
2, N
2o etc., can cause the destruction of acid rain, photochemical fog, greenhouse effects and ozone layer.The NOx 63% of occurring in nature is from industrial pollution and traffic pollution, and be 2 times of naturally-occurring source, wherein the discharge of power industry and vehicle exhaust respectively accounts for 40%, and other industrial pollution sources account for 20%.Under common ignition temperature, in the NOx that combustion process produces, more than 90% is NO, NO
2account for 5% ~ 10%, separately have the N of minute quantity
2o.
NOx is a kind of colourless, odorless, inactive gas, and except generating complex compound, absorbed all hardly in water or in alkali lye, NOx is discharged in air and is oxidized to NO very soon
2, cause breathing problem, human health worked the mischief.At present, the Treatment process method of nitrogen oxide mainly comprises: the selective catalytic reduction (SCR) (the maximum denitration efficiency of this method is not less than 80%) of main flow; The SNCR method (SNCR) (denitration efficiency 50%-65%) of main flow; Also has alkali absorption method; Oxidizing process, antimicrobial absorbent method, red-hot charcoal reduction method, catalytic decomposition, liquid-film method, electronic beam method, corona discharge pulse plasma method, CuO method, NOxSO technique, SNRB technique denitration technology, reaction type oxidative absorption denitration technology etc.
The principle of SCR (SCR, Selective Catalytic Reduction) is, under catalyst action, with ammonia (NH
3) make reducing agent by the mainly NO and a small amount of NO of the NOx(in flue gas
2) be reduced into non-harmful nitrogen (N
2) and water (H
2o); Oxygen in flue gas seldom and NH
3reaction, thermal discharge is little.The meaning of " selective " refers to that ammonia selectively carries out reduction reaction, only selects NOx reduction here.
SNCR (SNCR, Selective Non-Catalytic Reduction) principles of chemistry of technique, be that the reducing agent (as ammoniacal liquor or urea etc.) containing NHx base is sprayed into the region that fire box temperature is 850-1250 DEG C, generate N there is no with NO, reduction reaction to occur under catalyst action
2and H
2o.Due at certain temperature range, when there being oxygen, amino accounts for leading to the reduction of NOx in every other chemical reaction, shows selective, is therefore referred to as SNCR method, namely ammonia selectively carries out reduction reaction, only selects NOx reduction here.
the content of invention
The object of the present invention is to provide a kind of SNCR equipment for denitrifying flue gas, reduced investment, floor space are little, engineering equipment modularization, denitration effect are remarkable, it is easy to run, operating cost is lower.
The technical scheme that the present invention takes is:
A kind of SNCR equipment for denitrifying flue gas, it is characterized in that, comprise hopper (2), jet pump (4), urea warehouse (6), dosing chamber (8), urea liquid storage tank (10), boiler (12), described hopper (2) is connected with jet pump (4) by batcher (3), jet pump (4) one end connecting fan (5), the other end connects urea warehouse (6), described urea warehouse (6) is connected with dosing chamber (8) by electronic scale (7), dosing chamber (8) is connected with urea liquid storage tank (10) by feeding engine, urea liquid storage tank (10) is connected by the spray gun (13) that solution pump (11) is inner with boiler (12), the solution that solution pump (11) is extracted out is diluted by dilution water pump (16), the furnace chamber (14) of boiler (12) is communicated with gas collection pump (1).
Further, in described dosing chamber (8), vertical mixer (9) is set.
Further, described boiler (12) bottom is connected with pond (15) by pipeline.
Further, the gas pipeline that described gas collection pump (1) is communicated with boiler (12) arranges magnetic valve.
Further, described spray gun (13) shower nozzle place arranges filter, prevents atomizer from blocking.
Beneficial effect of the present invention is:
1, the present invention is little to boiler improvement amount, does not change chamber structure and operating condition, does not increase flue gas resistance, and little on boiler impact, floor space is few.
2, present system is simple, and hopper is connected with jet pump by batcher, and gas collection pump is communicated with boiler by magnetic valve, Automatic Control, and urea warehouse is connected with dosing chamber by electronic scale, ensure that the accuracy of batching, safe and reliable.
3, the vertical mixer in dosing chamber ensures stirring of slurry, and the furnace chamber of boiler is communicated with gas collection pump, at high temperature with when not having catalyst, oxygen in flue gas participates in reaction, and thermal discharge is large, denitration efficiency 50%-65%, not spent catalyst, operating cost is low.
4, this equipment does not use catalyst in running, SO2 in flue gas is not converted into SO3, avoid ammonium sulfate and ammonium hydrogen sulfate to the Corrosion blockage of back-end surfaces, flexibility is good, and reducing agent ammonia oxygen compares: 1.0-1.5, amount of ammonia slip: < 8mg/m3, after this denitrification apparatus comes into operation, reduce the discharge of nitrogen oxide (NOx), reduce environmental pollution, social benefit is good.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Wherein, 1, gas collection pump; 2, hopper; 3, batcher; 4, jet pump; 5, blower fan; 6, urea warehouse; 7, electronic scale; 8, dosing chamber; 9, vertical mixer; 10, urea liquid storage tank; 11, solution pump; 12, boiler; 13, spray gun; 14, furnace chamber; 15, pond; 16, water pump is diluted.
Detailed description of the invention
SNCR technology denitration principle is:
Within the scope of 850 ~ 1100 DEG C, the key reaction of NH3 or urea reducing NOx is:
NH3 is reducing agent:
4NH3 + 4NO +O2 → 4N2 + 6H2O
Urea is reducing agent:
NO+CO(NH2)2 +1/2O2 → 2N2 + CO2 + H2O
A kind of SNCR equipment for denitrifying flue gas, it is characterized in that, comprise hopper 2, jet pump 4, urea warehouse 6, dosing chamber 8, urea liquid storage tank 10, boiler 12, described hopper 2 is connected with jet pump 4 by batcher 3, jet pump 4 one end connecting fan 5, the other end connects urea warehouse 6, described urea warehouse 6 is connected with dosing chamber 8 by electronic scale 7, dosing chamber 8 is connected with urea liquid storage tank 10 by feeding engine, urea liquid storage tank 10 is connected with the spray gun 13 of boiler 12 inside by solution pump 11, the solution that solution pump 11 is extracted out is diluted by dilution water pump 16, the furnace chamber 14 of boiler 12 is communicated with gas collection pump 1.
Further, in described dosing chamber 8, vertical mixer 9 is set.
Further, described boiler 12 bottom is connected with pond 15 by pipeline.
Further, the gas pipeline that described gas collection pump 1 is communicated with boiler 12 arranges magnetic valve.
Further, described spray gun 13 shower nozzle place arranges filter, prevents atomizer from blocking.
Above-mentioned explanation is not limitation of the present invention, and the present invention is also not limited in above-described embodiment, the change that those skilled in the art make in essential scope of the present invention, remodeling, interpolation or replacement, also should belong to protection scope of the present invention.
Claims (4)
1. a SNCR equipment for denitrifying flue gas, it is characterized in that, comprise hopper (2), jet pump (4), urea warehouse (6), dosing chamber (8), urea liquid storage tank (10), boiler (12), described hopper (2) is connected with jet pump (4) by batcher (3), jet pump (4) one end connecting fan (5), the other end connects urea warehouse (6), described urea warehouse (6) is connected with dosing chamber (8) by electronic scale (7), dosing chamber (8) is connected with urea liquid storage tank (10) by feeding engine, urea liquid storage tank (10) is connected by the spray gun (13) that solution pump (11) is inner with boiler (12), the solution that solution pump (11) is extracted out is diluted by dilution water pump (16), the furnace chamber (14) of boiler (12) and gas collection pump (1)
A kind of SNCR equipment for denitrifying flue gas according to claim 1, is characterized in that, arranges vertical mixer (9) in described dosing chamber (8).
2. a kind of SNCR equipment for denitrifying flue gas according to claim 1, is characterized in that, described boiler (12) bottom is connected with pond (15) by pipeline.
3. a kind of SNCR equipment for denitrifying flue gas according to claim 1, is characterized in that, the gas pipeline that described gas collection pump (1) is communicated with boiler (12) arranges magnetic valve.
4. a kind of SNCR equipment for denitrifying flue gas according to claim 1, is characterized in that, described spray gun (13) shower nozzle place arranges filter, prevents atomizer from blocking.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410846859.4A CN104785092A (en) | 2014-12-31 | 2014-12-31 | An SNCR flue gas denitration device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410846859.4A CN104785092A (en) | 2014-12-31 | 2014-12-31 | An SNCR flue gas denitration device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104785092A true CN104785092A (en) | 2015-07-22 |
Family
ID=53550552
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410846859.4A Pending CN104785092A (en) | 2014-12-31 | 2014-12-31 | An SNCR flue gas denitration device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104971613A (en) * | 2015-07-24 | 2015-10-14 | 江苏揽山环境科技有限公司 | Smoke denitration method and powder spray gun suitable for smoke denitration process |
| CN105276598A (en) * | 2015-10-21 | 2016-01-27 | 西安交通大学 | Method for simultaneously controlling coking and corroding of heating surface and NOx emission of biomass CFB boiler |
| CN105944546A (en) * | 2016-07-08 | 2016-09-21 | 安徽电气工程职业技术学院 | In-furnace denitration system and in-furnace denitration technology of circulating fluidized bed (CFB) boiler |
| CN107020008A (en) * | 2016-12-07 | 2017-08-08 | 中国石化集团胜利石油管理局胜利发电厂 | A kind of CFBB denitrating system and method |
| CN107020008B (en) * | 2016-12-07 | 2024-04-26 | 中国石油化工集团有限公司 | Denitration system and method for circulating fluidized bed boiler |
-
2014
- 2014-12-31 CN CN201410846859.4A patent/CN104785092A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104971613A (en) * | 2015-07-24 | 2015-10-14 | 江苏揽山环境科技有限公司 | Smoke denitration method and powder spray gun suitable for smoke denitration process |
| CN105276598A (en) * | 2015-10-21 | 2016-01-27 | 西安交通大学 | Method for simultaneously controlling coking and corroding of heating surface and NOx emission of biomass CFB boiler |
| CN105276598B (en) * | 2015-10-21 | 2017-08-01 | 西安交通大学 | The method for controlling the heating surface coking corrosion of biomass CFB boiler and NOx emission simultaneously |
| CN105944546A (en) * | 2016-07-08 | 2016-09-21 | 安徽电气工程职业技术学院 | In-furnace denitration system and in-furnace denitration technology of circulating fluidized bed (CFB) boiler |
| CN107020008A (en) * | 2016-12-07 | 2017-08-08 | 中国石化集团胜利石油管理局胜利发电厂 | A kind of CFBB denitrating system and method |
| CN107020008B (en) * | 2016-12-07 | 2024-04-26 | 中国石油化工集团有限公司 | Denitration system and method for circulating fluidized bed boiler |
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| PB01 | Publication | ||
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Application publication date: 20150722 |