CN102553419A - Reducing agent injection device for selective non-catalytic reduction system - Google Patents
Reducing agent injection device for selective non-catalytic reduction system Download PDFInfo
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- CN102553419A CN102553419A CN2012100734877A CN201210073487A CN102553419A CN 102553419 A CN102553419 A CN 102553419A CN 2012100734877 A CN2012100734877 A CN 2012100734877A CN 201210073487 A CN201210073487 A CN 201210073487A CN 102553419 A CN102553419 A CN 102553419A
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Abstract
The invention belongs to the field of flue gas denitrification and discloses a reducing agent injection device for a selective non-catalytic reduction (SNCR) flue gas denitrification technology. The device is mainly used for kilns, fluidized-bed boilers, and middle and small power plant boilers. The device is characterized in that: a grating is arranged in a hearth to ensure that a reducing agent can be added at every position on a two-dimensional section in the hearth; and adjusting the injection distance, atomizing angle, atomizing particle size and adding amount of the reducing agent by adjusting the pressure in a liquid path pipeline and a gas path pipeline and selecting atomizing nozzles. Compared with the conventional reducing agent injection device, the invention has the advantages that: the denitrification efficiency of an SNCR system employing the reducing agent injection device can be improved by about 30 percent.
Description
Technical field
The invention belongs to the denitrating flue gas field, specifically a kind of injection of reducing agent injection device that is used for SNCR (SNCR) gas denitrifying technology is mainly used in kiln, fluidized-bed combustion boiler and middle-size and small-size boiler of power plant.
Background technology
The SNCR technology is that reducing agent is sprayed in the pending flue gas, make it with flue gas in nitrogen oxide the SNCR reaction takes place, be a kind of denitration technology of harmless nitrogen with poisonous conversion of nitrogen oxides.In the GB GB13223-2011 of promulgation in 2011, this technology is recommended as one of commercial denitration technology of two kinds of maturations by Chinese Ministry of Environmental Protection.Reducing agent is the core of SNCR technology with mixing of flue gas.Reducing agent mixes well with flue gas, and chemical reaction is just abundant, and system's denitration efficiency is just high, and it is just few that unreacted reducing agent leaks into the secondary pollution that causes in the atmosphere; Otherwise reducing agent mixes poorly with flue gas, and chemical reaction is just insufficient, and the denitration efficiency of system is just low, and it is just big that unreacted reducing agent leaks into the secondary pollution that causes in the atmosphere.At present, SNCR system denitration efficiency is generally 30 ~ 50%.Reducing agent and flue gas mixed effect are not good to be the main cause that causes denitration efficiency low.
In SNCR hybrid technology field, main at present employing wall formula injection apparatus or rifle formula injection apparatus realization reducing agent mix with pending flue gas.Relevant patent also concentrates on optimization and transformation aspect to wall formula injection apparatus and rifle formula injection apparatus.For example: the patent of invention that No.11 Rosearch Inst., No. 6 Inst., China Aerospace Science & Technology Group Co declares, denomination of invention are " SNCR denitration multiinjector spear injector ", and the application notification number is CN102160964A.
In recent years, along with the raising of computer modeling technique, predict that accurately the concentration of each regional nitrogen oxide in the stove and the flow velocity of flue gas have become possibility.Under this background, the requirement of injection of reducing agent injection device is also risen to: at nitrous oxides concentration height and the big zone reducing agents of throwing of flue gas flow rate, reducing agent is thrown in zone low at nitrous oxides concentration and that flue gas flow rate is little less more.Be embodied in: the ability that requires injection apparatus all to have the control reducing agent to throw in each position on the flue gas circulation two-dimensional section.This is not only comprising the control of reducing agent injected volume on each position, and is comprising reductant solution jet length on each position, atomizing angle, the control of atomizing particle size.Wall formula device in the past and rifle formula injection apparatus can not satisfy the requirement of the input control of each position on this two dimensional surface well.
Summary of the invention
The objective of the invention is to provides a kind of injection of reducing agent injection device for kiln, fluidized-bed combustion boiler and boiler of power plant SNCR system; This device not only can be controlled the injected volume of reducing agent, and can regulate jet length each position on the two dimensional surface; Atomizing angle, atomizing particle size.
Main technical schemes of the present invention: be used for the injection of reducing agent injection device of selective non-catalytic reduction system, comprise the atomizer that places in the burner hearth, it is characterized in that some atomizers are distributed on the reducing agent spraying grid in the burner hearth.
Usually, the reducing agent spraying grid of injection apparatus of the present invention is made up of two-layer mutually perpendicular pipe row, and every layer of pipe row is made up of the plurality of conduits tiling, and some atomizers are uniformly distributed on the every pipeline.
The outermost layer of said pipeline is a tube wall, and the abrasionproof coating is arranged on the tube wall, is cooling-water duct in the tube wall, and cooling-water duct connects circulating water cooling system; There are atomizing air pipeline and reductant solution pipeline in cooling-water duct inside, atomizing air pipeline and reductant solution pipeline respectively with tube wall on atomizer link to each other; Reductant solution pipeline and atomizing air pipeline are connected with control valve; Some control valves are formed the valve station.
In shape, structure and combination thereof, the total essential features of injection of reducing agent injection device of the present invention and immediate prior art is: utilize atomizer, with spraying into burner hearth after the reductant solution atomizing.
In shape, structure and combination thereof, this novel injection of reducing agent injection device and immediate prior art different techniques characteristic are: in burner hearth, arrange grid, make that reducing agent all can be thrown in each position on the section of burner hearth; Through the adjusting of pressure and selecting for use of nozzle in influidic pipe road and the gas circuit pipeline, regulate the jet length of reducing agent, atomizing angle, atomizing particle size.
Adopt the SNCR system denitration efficiency of injection of reducing agent injection device of the present invention about 70%, improve about 30% than the SNCR system denitration efficiency that adopts existing injection of reducing agent injection device.
Description of drawings
Fig. 1 is an embodiment of the invention reducing agent spraying principle of device sketch map; Fig. 2 is an embodiment reducing agent spraying cell structure sketch map; Fig. 3 is an embodiment reducing agent spraying grid pipeline cross-sectional view.
Among the figure, 1-reducing agent spraying grid; 2-valve station; The 3-recirculating cooling water system; 4-atomizing air pipeline; 5-reductant solution pipeline; The 6-cooling water; The 7-pipeline; The 8-burner hearth; The 9-atomizer; The 10-smoke inlet; The 11-exhanst gas outlet; The 12-cooling-water duct; The 13-tube wall.
The specific embodiment
Be described further below in conjunction with the operation principle and the running status of accompanying drawing this novel injection of reducing agent injection device.
Embodiment: the main feature of present embodiment SNCR injection of reducing agent injection device is that some atomizers (9) are distributed on the reducing agent spraying grid (1) in the burner hearth (8).
Specifically, this device mainly comprises reducing agent spraying grid (1), valve station (2), recirculating cooling water system (3) three parts, and its principle is shown in accompanying drawing 1.The reducing agent spraying grid is put (1) in burner hearth (8), and hundreds of atomizers (9) have been installed on it, is used for realizing the input of each position recovering agent.Reducing agent spraying grid (1) is operated in the environment of about 900 ° of C, and cooling water (6) has been equipped with one and has overlapped the cooling that circulating water cooling system (3) is used for reducing agent spraying grid (1).Integrated hundreds of valves in the valve station (2); The pressure that is used for the reductant solution pipeline (5) that links to each other with atomizer (9) of control and atomizing air pipeline (4); Be aided with and select different atomizer (9) for use, then not only can control injected volume that each atomizer (9) is located reducing agent and scalable jet length; Atomizing angle, atomizing particle size.
The structure of reducing agent spraying grid (1) is seen Fig. 2.Reducing agent spraying grid (1) is made up of two-layer mutually perpendicular pipe row, and every layer of pipe row is made up of plurality of conduits (7) tiling.Every pipeline (7) is gone up and is evenly arranged a plurality of atomizers (9).Utilize this structure can be with even hundreds of atomizers of cloth (9) on the cross section of burner hearth (8).
The structure of each root pipeline (7) is seen Fig. 3.Outermost layer is tube wall (13), and tube wall has the abrasionproof coating on (13), and tube wall is a cooling-water duct in (13), and the cooling-water duct (12) in the pipe links to each other with circulating water cooling system (3).There are atomizing air pipeline (4) and reductant solution pipeline (5) in cooling-water duct (12) inside.Atomizing air pipeline (4) and reductant solution pipeline (5) respectively with tube wall (13) on atomizer (9) link to each other.Reductant solution gets into burner hearth (8) after atomizer (9) atomizing from reductant solution pipeline (5).Pressure in reductant solution pipeline (5) and the atomizing air pipeline (4) is by one group of valve regulated in valve station (2).
As shown in Figure 2, in the cracking burner hearth (8) of certain cement rotary kiln, the orthogonal placement of two-layer tube bank makes numerous atomizer (9) be distributed in each position in cross section to reducing agent spraying grid (1) by horizontal setting.
Need the flue gas of denitration to get in the stove from cracking burner hearth (8) upper end smoke inlet (10); Vertically pass the reducing agent spraying grid; Mix with the reducing agent that sprays in the atomizer, denitration reaction takes place, the flue gas after the processing is discharged from cracking burner hearth (8) lower end exhanst gas outlet (11).
Nitrogen oxide distributes in the stove of calculating according to Computer Numerical Simulation.Follow the principle of " reducing agents of throwing toward the many zones of nitrogen oxide are thrown reducing agent toward the few zone of nitrogen oxide less ", to the furnace injection reducing agent.Concrete operations are following: many group valve openings in by-pass valve control station (2); Regulate reductant solution pressure and atomization air pressure in each grid pipeline (7) shown in Figure 3, select suitable atomizer (9) for use for each position simultaneously, then for each position on the two dimensional surface; The injected volume of scalable reducing agent not only; And can realize jet length, atomizing angle, the control of nozzle parameters such as atomizing particle size.
Claims (4)
1. an injection of reducing agent injection device that is used for selective non-catalytic agent restoring system comprises the atomizer that places in the burner hearth, it is characterized in that some atomizers are distributed on the reducing agent spraying grid in the burner hearth.
2. injection apparatus as claimed in claim 1 is characterized in that the reducing agent spraying grid is made up of two-layer mutually perpendicular pipe row, and every layer of pipe row tiled by plurality of conduits and formed, and some atomizers are uniformly distributed on the every pipeline.
3. injection apparatus as claimed in claim 2, the outermost layer that it is characterized in that said pipeline is a tube wall, and the abrasionproof coating is arranged on the tube wall, is cooling-water duct in the tube wall, cooling-water duct connects circulating water cooling system; There are atomizing air pipeline and reductant solution pipeline in cooling-water duct inside, atomizing air pipeline and reductant solution pipeline respectively with tube wall on atomizer link to each other; Reductant solution pipeline and atomizing air pipeline are connected with control valve.
4. injection apparatus as claimed in claim 2 is characterized in that forming the valve station by some control valves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100734877A CN102553419A (en) | 2012-03-20 | 2012-03-20 | Reducing agent injection device for selective non-catalytic reduction system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012100734877A CN102553419A (en) | 2012-03-20 | 2012-03-20 | Reducing agent injection device for selective non-catalytic reduction system |
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| CN102553419A true CN102553419A (en) | 2012-07-11 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102921284A (en) * | 2012-10-11 | 2013-02-13 | 浙江省环境保护科学设计研究院 | Method and device for controlling NOx concentration in smoke gas of cement kiln |
| CN108434964A (en) * | 2018-05-22 | 2018-08-24 | 中国华能集团清洁能源技术研究院有限公司 | A kind of matrix form injection apparatus for circulating fluidized bed boiler SNCR denitration system |
| CN109847552A (en) * | 2019-01-16 | 2019-06-07 | 安徽海螺水泥股份有限公司 | A kind of cement kiln flue gas denitrating system and its control method |
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| KR100794389B1 (en) * | 2007-01-24 | 2008-01-15 | 한국에너지기술연구원 | Combustor crossing triple annulus tube type reducing agent injector for nox reduction by selective non-catalytic reduction |
| CN102160964A (en) * | 2011-02-18 | 2011-08-24 | 中国航天科技集团公司第六研究院第十一研究所 | Selective non-catalytic reduction (SNCR) denitration multi-nozzle long-gun injector |
| CN202052468U (en) * | 2011-04-13 | 2011-11-30 | 湖南安普诺环保科技有限公司 | Smoke gas selective noncatalytic reduction denitration integral device |
| CN202666684U (en) * | 2012-03-20 | 2013-01-16 | 南京龙源环保有限公司 | Reducing agent spray device for selective non-catalytic reduction system |
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2012
- 2012-03-20 CN CN2012100734877A patent/CN102553419A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100794389B1 (en) * | 2007-01-24 | 2008-01-15 | 한국에너지기술연구원 | Combustor crossing triple annulus tube type reducing agent injector for nox reduction by selective non-catalytic reduction |
| CN102160964A (en) * | 2011-02-18 | 2011-08-24 | 中国航天科技集团公司第六研究院第十一研究所 | Selective non-catalytic reduction (SNCR) denitration multi-nozzle long-gun injector |
| CN202052468U (en) * | 2011-04-13 | 2011-11-30 | 湖南安普诺环保科技有限公司 | Smoke gas selective noncatalytic reduction denitration integral device |
| CN202666684U (en) * | 2012-03-20 | 2013-01-16 | 南京龙源环保有限公司 | Reducing agent spray device for selective non-catalytic reduction system |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102921284A (en) * | 2012-10-11 | 2013-02-13 | 浙江省环境保护科学设计研究院 | Method and device for controlling NOx concentration in smoke gas of cement kiln |
| CN102921284B (en) * | 2012-10-11 | 2014-10-08 | 浙江省环境保护科学设计研究院 | Method and device for controlling NOx concentration in smoke gas of cement kiln |
| CN108434964A (en) * | 2018-05-22 | 2018-08-24 | 中国华能集团清洁能源技术研究院有限公司 | A kind of matrix form injection apparatus for circulating fluidized bed boiler SNCR denitration system |
| CN109847552A (en) * | 2019-01-16 | 2019-06-07 | 安徽海螺水泥股份有限公司 | A kind of cement kiln flue gas denitrating system and its control method |
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Application publication date: 20120711 |