CN103933853A - Integrally controlled denitration device - Google Patents
Integrally controlled denitration device Download PDFInfo
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- CN103933853A CN103933853A CN201410166006.6A CN201410166006A CN103933853A CN 103933853 A CN103933853 A CN 103933853A CN 201410166006 A CN201410166006 A CN 201410166006A CN 103933853 A CN103933853 A CN 103933853A
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- China
- Prior art keywords
- pipeline
- ammonium hydroxide
- air
- boiler
- denitration
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Abstract
The invention provides an integrally controlled denitration device. An ammonium hydroxide storage tank is connected with an ammonium hydroxide distribution box through a pipeline; an ammonium hydroxide pump is connected with an ammonium hydroxide ejector inside a boiler through a pipeline; an air pump is connected with an air storage tank; a compressed air pipe and an ammonium hydroxide pipe are respectively connected with the boiler; an air preheater is connected with an air transporting pipeline and a smoke discharge pipeline; the smoke discharge pipeline is connected with a smoke discharger; an ammonium hydroxide pump station is connected with a PLC; a metering distributor is connected to the ammonium hydroxide pipeline and the air transporting pipeline; the ammonium hydroxide pump and the control device form the ammonium hydroxide pump station. The ammonium hydroxide pump station is controlled to run through the PLC, meanwhile, the overall denitration system runs in balance, and nitrate nitrogen in burning smoke of the boiler is denitrated according to an SNCR denitration principle. The integrally controlled denitration device has the advantages of being accurate to control, stable to run and convenient to carry out integrated control and having a good denitration effect, and can be used as a device for denitration of boiler smoke.
Description
Technical field
The present invention is to provide field of Environment Protection and purify air, prevent that nitrogen oxide from polluting a kind of integrated control denitrification apparatus of application.
Background technology
One SNCR denitration technology:
A kind of to spraying ammonia or urea etc. in flue gas containing using NH
3the reducing agent of base is in high temperature range, optionally the NO in flue gas
xbe reduced to N
2and H
20.Research shows, in 927-1093 ℃ of temperature range, under the effect of catalyst-free, the amino reductives such as ammonia or urea are optionally the NO in flue gas
xbe reduced to N
2and H
20, substantially not with flue gas in oxygen effect, developed accordingly SNCR method.
Two, denitrating technique:
1. SNCR integral process is introduced nitrogen oxide (NO
x) be the gas producing due to the oxidation of nitrogen in burning process process, it not only stimulates people's respiratory system, and infringement animals and plants, damage the ozone layer, and are to cause one of greenhouse effects, acid rain and photochemically reactive main matter.All over the world to NO
xemission limit set require to be all tending towards strict, and thermal power plant, garbage burning factory and cement plant etc. are as NO
xthe main source of gas discharging, it reduces discharging and is subject to especially attention especially.
The whole world reduces boiler of power plant NO at present
xdischarge effective main method and be broadly divided into following four kinds:
(1), low nitrogen burning technology, in combustion process, control the generation of nitrogen oxide, be mainly applicable to large coal-fired boiler etc.; Low NO
xcombustion technology can only reduce NO
xthe 30-50% of discharge value, further reduce NO
xdischarge, must adopt gas denitrifying technology.
(2), SCR technology, (Se1ective Catalytic Reduction, SNCR), is mainly used in large coal-fired boiler, is to apply maximum methods in current China gas denitrifying technology.
(3), SNCR technology, (SNCR, Se1ective Nor%ta1ytic Reduction), is mainly used in the medium or mini type boilers such as garbage burning factory, technology maturation is compared with SCR method but its efficiency is low, invests littlely, the construction period is short.
(4) SCR technology, (SCR)+SNCR technology (SNCR), is mainly used in the low NO of large coal-fired boiler
xdischarge and the limited situation in place, be also relatively suitable for old boiler transformation project.
Currently used denitration technology, is mainly comprised of discrete denitrification apparatus, exists to control to disperse the problem that operational efficiency is low and denitration effect can not touch the mark.
Summary of the invention
In order to realize the integrated operation of denitrification apparatus, the invention provides a kind of integrated control unit of denitration.Running and overall system that this device is controlled ammoniacal liquor pumping plant by PLC controller are moved, and solve the technical problem of the integrated control of denitration of boiler smoke.
The scheme that technical solution problem of the present invention adopts is:
Tank used for storing ammonia is connected with ammoniacal liquor distributor box by pipeline, aqua ammonia pump is connected with the ammonia water spray device in being located at boiler by pipeline, air pump is connected with air accumulator, compressed air hose is connected with in boiler respectively with ammonia water pipe, between air delivering pipeline and smoke pipeline, be connected with air preheater, smoke pipeline is connected with fume emission device, and ammoniacal liquor pumping plant is connected with PLC controller, on ammoniacal liquor pipeline and air delivering pipeline, is connected with metered dose dispensers.
Aqua ammonia pump and control device form ammoniacal liquor pumping plant.
Good effect, the present invention controls the running of ammoniacal liquor pumping plant by PLC controller, make whole denitrating system balance movement simultaneously, utilizes SNCR denitration principle, and the nitrate nitrogen in boiler combustion flue gas is carried out to denitration.Have precise control, system operates steadily, and denitration effect is good, is convenient to the advantage of integrated control.The suitable application of installation as denitration of boiler smoke.
Accompanying drawing explanation
Fig. 1 is composition diagram of the present invention
Fig. 2 is working state schematic representation of the present invention
In figure, 1. tank used for storing ammonia, 1.1. aqua ammonia pump, 1.2. ammonia water spray device, 2, ammoniacal liquor distributor box, 3. air accumulator, 4. ammoniacal liquor pumping plant, 5. metered dose dispensers, 6.PLC controller, 7. compressed air hose, 8. ammonia water pipe, 9. boiler, 9.1. pipeline burner, 10. air pump, 11. air preheaters, 12. fume emission devices.
The specific embodiment
According to the figure, tank used for storing ammonia 1 is connected with ammoniacal liquor distributor box 2 by pipeline, aqua ammonia pump 1.1 is connected with the ammonia water spray device 1.2 in being located at boiler 9 by pipeline, air pump 10 is connected with air accumulator 3, compressed air hose 7 and ammonia water pipe 8 are connected with boiler 9 is interior respectively, between air delivering pipeline and smoke pipeline, are connected with air preheater 11, and smoke pipeline is connected with fume emission device 12, ammoniacal liquor pumping plant 4 is connected with PLC controller 6, is connected with metered dose dispensers 5 on ammoniacal liquor pipeline and air delivering pipeline.
Aqua ammonia pump and control device form ammoniacal liquor pumping plant.
Described integrated control is to control ammoniacal liquor input quantity by PLC controller integral, and emitted dose and the compressed-air actuated amount of sending into, make boiler temperature, flue gas discharge capacity and the coordinating and unifying of ammoniacal liquor supply.
Operation principle:
SNCR SNCR denitrating technique is to contain NH
xreducing agent ammonia, ammoniacal liquor or the urea of base, spray into 900 ℃ of-1100 ℃ of burner hearth regions, and the rapid thermal decomposition of this reducing agent becomes NH
3with other accessory substance, subsequently NH
3with the NO in flue gas
xcarry out SNCR reaction and generate N
2and H
20.
Feature:
The present invention can realize boiler combustion denitrification integral and control, and therefore, compares with unidirectional control technology respectively, has superiority.
Claims (1)
1. an integrated control denitrification apparatus, it is characterized in that: tank used for storing ammonia (1) is connected with ammoniacal liquor distributor box (2) by pipeline, aqua ammonia pump (1.1) is connected with the ammonia water spray device (1.2) in being located at boiler (9) by pipeline, air pump (10) is connected with air accumulator (3), compressed air hose (7) is connected with in boiler (9) respectively with ammonia water pipe (8), between air delivering pipeline and smoke pipeline, be connected with air preheater (11), smoke pipeline is connected with fume emission device (12), ammoniacal liquor pumping plant (4) is connected with PLC controller (6), on ammoniacal liquor pipeline and air delivering pipeline, be connected with metered dose dispensers (5),
Aqua ammonia pump and control device form ammoniacal liquor pumping plant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410166006.6A CN103933853A (en) | 2014-04-24 | 2014-04-24 | Integrally controlled denitration device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410166006.6A CN103933853A (en) | 2014-04-24 | 2014-04-24 | Integrally controlled denitration device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103933853A true CN103933853A (en) | 2014-07-23 |
Family
ID=51181886
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410166006.6A Pending CN103933853A (en) | 2014-04-24 | 2014-04-24 | Integrally controlled denitration device |
Country Status (1)
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| CN (1) | CN103933853A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106139862A (en) * | 2016-08-05 | 2016-11-23 | 重庆赛迪热工环保工程技术有限公司 | Industrial furnace burning, denitrification integral system and method |
| CN114797435A (en) * | 2022-05-17 | 2022-07-29 | 合肥中亚环保科技有限公司 | SNCR (selective non-catalytic reduction) denitration system for circulating fluidized bed boiler |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6048510A (en) * | 1997-09-30 | 2000-04-11 | Coal Tech Corporation | Method for reducing nitrogen oxides in combustion effluents |
| CN2625387Y (en) * | 2003-05-27 | 2004-07-14 | 天津水泥工业设计研究院 | Device for reducing discharge of nitrogen oxide in cement kiln |
| JP2005000765A (en) * | 2003-06-10 | 2005-01-06 | Babcock Hitachi Kk | Exhaust gas denitrizer and exhaust gas denitration method |
| CN203447976U (en) * | 2013-08-28 | 2014-02-26 | 营口市环境工程开发有限公司 | SNCR (selective non-catalytic reduction) denitration device for circulating fluidized bed boiler |
| CN203777929U (en) * | 2014-04-24 | 2014-08-20 | 绥中捷创科技有限公司 | Denitrating device under integrated control |
-
2014
- 2014-04-24 CN CN201410166006.6A patent/CN103933853A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6048510A (en) * | 1997-09-30 | 2000-04-11 | Coal Tech Corporation | Method for reducing nitrogen oxides in combustion effluents |
| CN2625387Y (en) * | 2003-05-27 | 2004-07-14 | 天津水泥工业设计研究院 | Device for reducing discharge of nitrogen oxide in cement kiln |
| JP2005000765A (en) * | 2003-06-10 | 2005-01-06 | Babcock Hitachi Kk | Exhaust gas denitrizer and exhaust gas denitration method |
| CN203447976U (en) * | 2013-08-28 | 2014-02-26 | 营口市环境工程开发有限公司 | SNCR (selective non-catalytic reduction) denitration device for circulating fluidized bed boiler |
| CN203777929U (en) * | 2014-04-24 | 2014-08-20 | 绥中捷创科技有限公司 | Denitrating device under integrated control |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106139862A (en) * | 2016-08-05 | 2016-11-23 | 重庆赛迪热工环保工程技术有限公司 | Industrial furnace burning, denitrification integral system and method |
| CN114797435A (en) * | 2022-05-17 | 2022-07-29 | 合肥中亚环保科技有限公司 | SNCR (selective non-catalytic reduction) denitration system for circulating fluidized bed boiler |
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Application publication date: 20140723 |