CN104084017B - A kind of multidirectional injection SNCR adds individual layer SCR denitration system - Google Patents
A kind of multidirectional injection SNCR adds individual layer SCR denitration system Download PDFInfo
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- CN104084017B CN104084017B CN201410254929.7A CN201410254929A CN104084017B CN 104084017 B CN104084017 B CN 104084017B CN 201410254929 A CN201410254929 A CN 201410254929A CN 104084017 B CN104084017 B CN 104084017B
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- ammoniacal liquor
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Abstract
The present invention relates to a kind of multidirectional injection SNCR and add individual layer SCR denitration system, comprise the multiple spray guns being separately positioned on burner hearth antetheca, rear wall, sidewall and furnace roof, be arranged on the SCR reactor in boiler controller system between economizer and air preheater, the tank used for storing ammonia be connected by ammoniacal liquor pipeline with spray gun, be arranged on the ammoniacal liquor volume control device on ammoniacal liquor pipeline and high-pressure installation, the compressed air reservoir be connected with high-pressure installation, be arranged on the gas sensor in boiler controller system between deduster and desulfurizer in connecting pipe, be arranged on the central controller of Control Room; Ammoniacal liquor arrives spray gun through high-pressure installation, and ammoniacal liquor volume control device, high-pressure installation, gas sensor and SCR reactor are connected with central controller respectively and control its work.The present invention can make denitration efficiency reach 90 ~ 95%, and cost only has 60% of conventional scr denitrating technique, and operating cost only has 70% of conventional scr denitrating technique, and denitration rate is high and cost is also lower, and can make larger contribution to current severe air pollution.
Description
Technical field
The present invention relates to denitration of boiler smoke field, be specially a kind of multidirectional injection SNCR and add individual layer SCR denitration system.
Background technology
For adapting to the environmental requirement of increasingly stringent, perform GB13223-2011 " fossil-fuel power plant atmospheric pollutant emission standard ", and under current very severe haze air-polluting environment, denitration must be carried out to the flue gas of nitrogen-containing oxide.
The selective catalytic reduction of current denitrating technique method (SCR), SNCR (SNCR).SCR denitration efficiency can reach 80 ~ 90%, and SNCR denitration efficiency generally≤60%.Although SCR denitration technique efficiency is higher, cost of investment is very expensive, and operating cost is also very high; Although the cost of investment of SNCR denitration technique and operating cost are all lower, but denitration efficiency is limited, and the fluidized-bed combustion boiler that can only be separated at high-temp. vortex just has the denitration effect of 60%, if on coal-powder boiler, low temperature cyclonic separation fluidized-bed combustion boiler and chain-grate boiler, because there is no the flue gas afflux section of the temperature of 850 ~ 1050, so denitration efficiency is less than 40%; So be directed to above present situation, necessary innovative design goes out a kind of novel denitrating system.
Summary of the invention
For the shortcoming of above-mentioned prior art, the invention provides that a kind of operating cost is lower, desulfuration efficiency is much higher adds individual layer SCR denitration system to injection SNCR.
The present invention solves the problems of the technologies described above by the following technical solutions: a kind of multidirectional injection SNCR adds individual layer SCR denitration system, comprise and be separately positioned on boiler furnace antetheca, rear wall, multiple spray guns of sidewall and furnace roof, be arranged on the SCR reactor in boiler controller system between economizer and air preheater, the tank used for storing ammonia be connected by ammoniacal liquor pipeline with described spray gun, be arranged on the ammoniacal liquor volume control device on described ammoniacal liquor pipeline and high-pressure installation, the compressed air reservoir be connected with described high-pressure installation, be arranged on the gas sensor in boiler controller system between deduster and desulfurizer in connecting pipe, be arranged on the central controller of Control Room, described ammoniacal liquor arrives described spray gun through described high-pressure installation, described ammoniacal liquor volume control device, high-pressure installation, gas sensor are connected with described central controller respectively with SCR reactor, and central controller receives the gas signal that transmits from described gas sensor and controls described volume control device, high-pressure installation and the work of SCR reactor.
Further, a dilution water tank is connected with by water flow pipes with described high-pressure installation, described water flow pipes is provided with dilution water flow amount control device, described central controller is connected with described dilution water flow amount control device and controls its work, arrives described spray gun after described dilution water mixes with described ammoniacal liquor through described high-pressure installation.
As preferably, be provided with acoustic wave ash ejector described SCR reactor is other, this soot blower is connected with described compressed air reservoir by gas flow tube, and described gas flow tube is provided with draught damper, and described central controller is connected with described draught damper and controls its work.
As preferably, the ammonia concn in described tank used for storing ammonia is 20%.
As preferably, the reducing agent in described SCR reactor is ammoniacal liquor, and major catalyst is V
2o
5, co-catalyst is WO
3or MoO
3, catalytic activity is with V
2o
5the highest, and add WO
3or MoO
3as co-catalyst, the basis keeping catalytic reduction of NOx activity is reduced as far as possible to SO
2catalytic oxidation; Catalyst structure form is honeycomb fashion, when dust concentration is less than 50g/Nm
3time, because cellular catalyst geometric proportion surface area ratio is greatly board-like, under same engineering specifications, cellular catalyst consumption comparable board-like few about 20 ~ 30%, can reduce reactor size, reduce and take up an area space, but both catalyst total costs are similar, in addition, the structure of cellular catalyst possesses the ability of the various poisonous substance infringement of stronger opposing, long service life, has more economy.
The present invention compared with prior art also tool have the following advantages: the present invention adopts multi-direction injection SNCR to add individual layer SCR denitration, denitration efficiency can be made to reach 90 ~ 95%, cost of investment only has 60% of conventional scr denitrating technique, operating cost only has 70% of conventional scr denitrating technique, not only denitration rate is high but also cost is also lower, and can make larger contribution to the pollution of current very severe Air haze; Multi-direction injection and spray gun quantity is many, so ammoniacal liquor dilutes by design dilution water, makes the ammonia solution of injection fully mix with flue gas, reaches better denitration effect; Adopt ammoniacal liquor as reducing agent, ammoniacal liquor has more superiority relatively, and ammoniacal liquor source is more, and on market, the source of goods is in plentiful supply, convenient transportation.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Detailed description of the invention
The technological means realized to make the present invention, creation characteristic, reaching object and effect is easy to understand, below in conjunction with concrete diagram and embodiment, setting forth the present invention further.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
With reference to figure 1, stove fire 010 for being lighted by burner 01 below boiler furnace 00, the embodiment of the present invention provides a kind of multidirectional injection SNCR to add individual layer SCR denitration system, comprise and be separately positioned on boiler furnace 00 antetheca, rear wall, multiple spray guns 11 of sidewall and furnace roof, be arranged on the SCR reactor 2 in boiler controller system between economizer 02 and air preheater 03, the tank used for storing ammonia 1 be connected by ammoniacal liquor pipeline with described spray gun 11, be arranged on the ammoniacal liquor volume control device 12 on described ammoniacal liquor pipeline and high-pressure installation 31, the compressed air reservoir 3 be connected with described high-pressure installation 31, the dilution water tank 7 be connected by water flow pipes with described high-pressure installation 31, be arranged on the dilution water flow amount control device 72 in described water flow pipes, be arranged on the gas sensor 5 in boiler controller system between deduster 04 and desulfurizer 05 in connecting pipe, be arranged on the central controller 4 of Control Room, described spray gun 11 is arrived through described high-pressure installation 31 after described dilution water mixes with described ammoniacal liquor, described, high-pressure installation 31, gas sensor 5 are connected with described central controller 4 respectively with SCR reactor 2, and central controller 4 receives the gas signal that transmits from described gas sensor 5 and controls described ammoniacal liquor volume control device 12, dilution water flow amount control device 72, high-pressure installation 31 and SCR reactor 2 and works, described SCR reactor 2 side is provided with acoustic wave ash ejector 6, and this soot blower 6 is connected with described compressed air reservoir 3 by gas flow tube, described gas flow tube is provided with draught damper 32, and described central controller 4 is connected with described draught damper 32 and controls its work, reducing agent in described SCR reactor 2 is ammoniacal liquor, and major catalyst is V
2o
5, co-catalyst is WO
3or MoO
3, catalyst structure form is honeycomb fashion, and the ammonia concn in described tank used for storing ammonia is 20%, and last tail gas is discharged through chimney 06.
In the present invention, stove fire lighted by burner below boiler furnace, produce NOx waste gas, the central controller controls ammoniacal liquor volume control device of this system and dilution water flow amount control device, send after a certain amount of ammoniacal liquor and dilution water mixing into high-pressure installation, high-pressure installation is connected with compressed air reservoir, the air of high-pressure installation compression is arranged on burner hearth antetheca by sending to after mixed liquor pressurizing atomizing, rear wall, multiple spray guns of sidewall and furnace roof, the ammonia of atomization sprays in burner hearth at high temperature to react with NOx waste gas and carries out denitration by spray gun again, the ammonia that unreacted is complete and the NOx waste gas economizer in boiler controller system arrives SCR reactor, now EGT decreases, under the effect of catalyst, the ammonia do not reacted completely in stove above fast and nitrogen oxide react, by the nitrogen that paired for reduction of nitrogen oxide air does not pollute, when reacted gas arrives the gas sensor in boiler controller system between deduster and desulfurizer in connecting pipe, the NOx concentration that gas sensor will detect, flue gas flow and amount of ammonia slip signal send to a central controller, central controller carries out corresponding flow-control according to the data of setting to ammoniacal liquor volume control device and dilution water flow amount control device, and the control NOx be stored in SCR reactor ammoniacal liquor burst size and waste gas reacts, catalytic efficiency is reduced because of dust stratification in SCR reactor, central controller controls the air valve between compressed air reservoir and acoustic wave ash ejector simultaneously, soot blower is allowed to blow ash process to SCR reactor, last gas sensor is finally made to detect that flue gas data reach setting in advance, so just reach the object of the automatical and efficient denitration of boiler smoke.The present invention adopts multi-direction injection SNCR to add individual layer SCR denitration, denitration efficiency can be made to reach 90 ~ 95%, cost of investment only has 60% of conventional scr denitrating technique, operating cost only has 70% of conventional scr denitrating technique, not only denitration rate is high but also cost is also lower, and can make larger contribution to the pollution of current very severe Air haze.
More than show and describe general principle of the present invention and principal character and advantage of the present invention; the technical staff of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and description just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications; these changes and improvements all fall in the claimed scope of the invention, and application claims protection domain is defined by appending claims and equivalent thereof.
Claims (5)
1. a multidirectional injection SNCR adds individual layer SCR denitration system, it is characterized in that: comprise and be separately positioned on boiler furnace antetheca, rear wall, multiple spray guns of sidewall and furnace roof, be arranged on the SCR reactor in boiler controller system between economizer and air preheater, the tank used for storing ammonia be connected by ammoniacal liquor pipeline with described spray gun, be arranged on the ammoniacal liquor volume control device on described ammoniacal liquor pipeline and high-pressure installation, the compressed air reservoir be connected with described high-pressure installation, be arranged on the gas sensor in boiler controller system between deduster and desulfurizer in connecting pipe, be arranged on the central controller of Control Room, described ammoniacal liquor arrives described spray gun through described high-pressure installation, described ammoniacal liquor volume control device, high-pressure installation, gas sensor are connected with described central controller respectively with SCR reactor, and central controller receives the gas signal that transmits from described gas sensor and controls described volume control device, high-pressure installation and the work of SCR reactor.
2. one according to claim 1 multidirectional injection SNCR adds individual layer SCR denitration system, it is characterized in that: be connected with a dilution water tank with described high-pressure installation by water flow pipes, described water flow pipes is provided with dilution water flow amount control device, described central controller is connected with described dilution water flow amount control device and controls its work, arrives described spray gun after described dilution water mixes with described ammoniacal liquor through described high-pressure installation.
3. one according to claim 1 multidirectional injection SNCR adds individual layer SCR denitration system, it is characterized in that: described SCR reactor side is provided with acoustic wave ash ejector, this soot blower is connected with described compressed air reservoir by gas flow tube, described gas flow tube is provided with draught damper, and described central controller is connected with described draught damper and controls its work.
4. one according to claim 1 multidirectional injection SNCR adds individual layer SCR denitration system, it is characterized in that: the ammonia concn in described tank used for storing ammonia is 20%.
5. one according to claim 1 multidirectional injection SNCR adds individual layer SCR denitration system, it is characterized in that: the reducing agent in described SCR reactor is ammoniacal liquor, and major catalyst is V
2o
5, co-catalyst is WO
3or MoO
3, catalyst structure form is honeycomb fashion.
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104501195B (en) * | 2014-12-11 | 2017-05-31 | 杭州塘栖热电有限公司 | A kind of chain furnace and chain furnace method of denitration |
| CN104785080A (en) * | 2015-04-02 | 2015-07-22 | 浙江菲达脱硫工程有限公司 | SNCR and SCR combined denitration device and process |
| CN105597514A (en) * | 2016-02-03 | 2016-05-25 | 广东宝丽华电力有限公司 | Device and method for increasing denitration efficiency of circulating fluidized bed boiler |
| CN106268316A (en) * | 2016-08-26 | 2017-01-04 | 合肥合意环保科技工程有限公司 | A kind of multidirectional injection SNCR adds monolayer SCR denitration system |
| CN106268318A (en) * | 2016-09-21 | 2017-01-04 | 海南中航特玻科技有限公司 | A kind of glass furnace fume integral denitration desulfurization dust-removing technique equipment and technique |
| CN110180353A (en) * | 2019-05-31 | 2019-08-30 | 芜湖富春染织股份有限公司 | A kind of boiler smoke treatment process |
| CN111450682B (en) * | 2020-04-14 | 2021-02-26 | 安徽工业大学 | Deep denitration process for supercritical carbon dioxide coal-fired boiler |
| CN114642957A (en) * | 2022-03-07 | 2022-06-21 | 内蒙古金石镁业有限公司 | Combined denitration device and denitration method for industrial gas-fired boiler |
| CN114699905A (en) * | 2022-04-22 | 2022-07-05 | 山东保蓝环保工程有限公司 | Denitration injection device with cover for roasting furnace |
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| CN201524525U (en) * | 2009-09-11 | 2010-07-14 | 宇星科技发展(深圳)有限公司 | SCR flue gas denitrating device |
| CN103463977A (en) * | 2013-09-11 | 2013-12-25 | 林世国 | SCR (Selective Catalytic Reduction) denitration device for directly spraying ammonium hydroxide |
| CN203990305U (en) * | 2014-06-10 | 2014-12-10 | 湖南正明环境工程有限公司 | A kind of multidirectional injection SNCR adds individual layer SCR denitrating system |
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2014
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201524525U (en) * | 2009-09-11 | 2010-07-14 | 宇星科技发展(深圳)有限公司 | SCR flue gas denitrating device |
| CN103463977A (en) * | 2013-09-11 | 2013-12-25 | 林世国 | SCR (Selective Catalytic Reduction) denitration device for directly spraying ammonium hydroxide |
| CN203990305U (en) * | 2014-06-10 | 2014-12-10 | 湖南正明环境工程有限公司 | A kind of multidirectional injection SNCR adds individual layer SCR denitrating system |
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Address after: No. A2, No. A2, Jinhai Road, No. 128, Jinhai Road, Changsha City, Changsha Patentee after: Hunan Zhengming environmental Limited by Share Ltd Address before: 410000 Hunan province Changsha Yuhua District, Zhaohui Road No. 500 Jin Xiang International Star City Kam Nga Court 16 building 507 room Patentee before: HUNAN ZHENGMING ENVIRONMENTAL ENGINEERING CO., LTD. |
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