CN202590630U - Coal-fired boiler low-temperature selective catalytic reduction (SCR) fixed bed smoke denitration device - Google Patents
Coal-fired boiler low-temperature selective catalytic reduction (SCR) fixed bed smoke denitration device Download PDFInfo
- Publication number
- CN202590630U CN202590630U CN 201220228188 CN201220228188U CN202590630U CN 202590630 U CN202590630 U CN 202590630U CN 201220228188 CN201220228188 CN 201220228188 CN 201220228188 U CN201220228188 U CN 201220228188U CN 202590630 U CN202590630 U CN 202590630U
- Authority
- CN
- China
- Prior art keywords
- denitration
- fixed bed
- coal
- catalyst
- regeneration
- 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.)
- Expired - Lifetime
Links
Images
Landscapes
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The utility model provides a coal-fired boiler low-temperature selective catalytic reduction (SCR) fixed bed smoke denitration device. Smoke and denitration reducing agent ammonia are fed into a denitration reactor. The denitration device is provided with more than two denitration reactors. Sulfur dioxide (SO2) in the smoke reacts with the ammonia to produce sulfate, and the sulfate deposits on catalysts, and deactivates the catalyst. The denitration work of the denitration reactor with deactivated catalysts is stopped, and another denitration reactor is started to carry out the denitration reaction, and resurgent gases are fed into the denitration reactor with the deactivated catalysts for catalyst regeneration. Regenerated denitration reactor replaces the denitration reactor with the deactivated catalysts, and the process recycles repeatedly. In the regeneration process, the SO2 and the ammonia are degraded out, and the degraded gases after regeneration are exhausted from the denitration reactor. The coal-fired boiler low-temperature SCR fixed bed smoke denitration device overcomes defects of existing low-temperature SCR technology in real application, and is practicable and widely applicable.
Description
Technical field
The utility model belongs to the boiler smoke discharging processing device, particularly a kind of coal-burning boiler low-temperature SCR fixed bed equipment for denitrifying flue gas.
Background technology
In China's primary energy, the consumption ratio of coal is more than 70%, so coal is the main source of China's energy.The NO that produces in the coal burning process
XBe the SO that continues
2Demand one of important atmosphere pollution material of administering afterwards urgently.In order to protect environment, realize human sustainable development, strict environmental regulation has been formulated in countries in the world, has all formulated the special discharge standard of strict nitrogen oxidation like the U.S., Japan, Germany etc., and has stipulated the reduction plan of strict execution.On July 29th, 2011; China has issued GB13223-2011 " thermal power plant's atmosphere pollutants emission standards "; In formal enforcement on January 1st, 2012, wherein the discharge index of the NOX of coal-burning power plant has carried out significantly cutting down, and concentration of emission is from the 450mg/m of GB13223-2003 version
3Be lowered to the 100mg/m of GB13223-2011 version
3, whole newly-built coal-burning power plants need supporting denitrification apparatus, and old power plant need carry out the denitration transformation.
Traditional gas denitrifying technology mainly contains selective catalytic reduction (SCR) and SNCR method (SNCR), and wherein SNCR is low because of its denitration efficiency, and easy generation of secondary pollution is used less.Though the SCR method can realize very high denitration efficiency, satisfy strict standard limit of smog release, high temperature SCR denitration technology reaction temperature requires at 350 ℃-400 ℃, and reactor often is disposed in after the boiler, contains a large amount of SO in the flue gas of this arrangement
2, K
2O, CaO and As
2O
3Deng, can cause the catalyst poisoning inactivation, and the flying dust of high concentration can cause the obstruction and the corrosion of catalyst, reduce its service life; On the other hand, because the limitation phase property of space and pipeline is carried out the high temperature SCR system reform and need be destroyed original system in the existing steam generator system of some power plant, improvement expenses is very high.
Low-temperature SCR is reduced to 80-200 ℃ with reaction temperature, can the SCR reactor be arranged in the stove rear space behind deduster or the air-introduced machine, and the layout of most of units is not produced big influence; In addition, because the reduction of flue-gas temperature, low-temperature SCR will effectively reduce the volume of reactor; Secondly, owing to adopt fixed bed denitration and regeneration, the breakage rate of denitrating catalyst is low, need not replenish raw catelyst basically; Simultaneously because what adopt is that low flying dust arranges that the running environment of catalyst is better relatively, practice thrift the workload of system's operation maintenance, so there is advantage in low-temperature SCR Technological Economy aspect than high temperature SCR, is very competitive technology.
The low-temperature SCR hot of research and development mainly is the SCR catalyst of the anti-water of the efficient anti-sulphur of exploitation both at home and abroad at present.Publication number is that the Chinese utility model patent specification of CN101767003A, CN102008956A, CN101352681 discloses several kinds of low-temperature SCR catalysts; The oxide M nOx that all adopts manganese is as active component; Its carrier that adopts is slightly different, is respectively Ti oxide or active carbon as carrier.Because the low-temperature SCR reaction temperature is lower, the SO in the flue gas
2Meeting and NH
3Reaction generates salt such as ammonium sulfate, ammonium hydrogen sulfate attached to catalyst surface, makes activity of such catalysts descend gradually.Therefore, only depend on catalyst itself to be difficult to realize the performance of anti-sulphur and anti-water, this also is the main cause that the low-temperature SCR technology still can not industrial be applied.
Therefore, realize the low-temperature SCR of flue gas, need a kind of new feasible low-temperature SCR device.
The utility model content
The technical problem that the utility model solved is, to the existing difficult point of low-temperature SCR technology in practical application, propose a kind of feasible, the coal-burning boiler low-temperature SCR device that the scope of application is wider.
The technical scheme of the utility model is: a kind of coal-burning boiler low-temperature SCR fixed bed equipment for denitrifying flue gas comprises smoke inlet, regeneration gas inlet, ammonia inlet, exhanst gas outlet, regeneration gas outlet; Comprise Benitration reactor, this Benitration reactor is more than two, and fixed bed is set in the Benitration reactor, and catalyst is set on the fixed bed, and the fixed bed below is provided with gas distributor; Smoke inlet, ammonia inlet and regeneration gas inlet connect the Benitration reactor bottom, and Benitration reactor top is provided with exhanst gas outlet and regeneration gas outlet.
The regeneration gas outlet connects the washing cooling tower, and washing cooling tower top is provided with the regeneration gas evacuation port, and washing cooling tower bottom is provided with the product outlet.
The product outlet connects thick thick device, and thick thick device connects centrifuge, and centrifuge connects drier, and drier is provided with product outlet.
This catalyst is a low temperature catalyst.
The beneficial effect of the utility model is: the results showed; Use the low-temperature catalyzed fixed bed denitration method for flue gas of the utility model, under lower flue-gas temperature (80-200 ℃), can realize higher denitration performance; Removal efficiency of nitrogen oxides is 32-95%, and denitration efficiency is high.Not only be fit to newly constructed boiler, also be fit to the transformation of old boiler, low to the space requirement of power plant.Through the denitrating catalyst in two or many Benitration reactors is exhausted regeneration between respectively; Solve catalyst poisoning inactivation problem, improved system's operation stability, reduced catalyst attrition; Can not only reduce pollutant emission; The ammonium sulfate byproduct that produces in the recyclable denitrification process simultaneously is used for nitrogenous fertilizer, and other method of denitration has more economy at present, is with a wide range of applications.
Description of drawings
The apparatus structure sketch map of Fig. 1 the utility model.
The specific embodiment
Of Fig. 1, a kind of coal-burning boiler low-temperature SCR of the utility model fixed bed equipment for denitrifying flue gas comprises smoke inlet 1, regeneration gas inlet 2, ammonia inlet 3, exhanst gas outlet 4, regeneration gas outlet 5; Comprise Benitration reactor 6, this Benitration reactor 6 is more than two, is example with two in the present embodiment.In this Benitration reactor 6 fixed bde catalyst 61 is set, selects low temperature catalyst in the present embodiment for use, fixed bde catalyst 61 belows are provided with gas distributor 62; Smoke inlet 1, ammonia inlet 3 and regeneration gas inlet 2 connect Benitration reactor 6 bottoms; Benitration reactor 6 tops are provided with exhanst gas outlet 4 and regeneration gas outlet 5; Regeneration gas outlet 5 connects washing cooling tower 7; Washing cooling tower 7 tops are provided with regeneration gas evacuation port 71, and washing cooling tower 7 bottoms are provided with product outlet 72.Product outlet 72 connects thick thick device 8, and thick thick device 8 connects centrifuge 9, and centrifuge 9 connects drier 10, and drier 10 is provided with product outlet 11.
During use, flue gas and denitrification reducing agent ammonia are fed Benitration reactor 6, said flue gas and ammonia carry out gas-solid with the mode of adverse current or cross-flow and contact the NO in the flue gas in Benitration reactor 6 with between the fixed bde catalyst 61
XWith ammonia gas react, the nitrogen of production and steam are discharged Benitration reactor 6 with the denitration flue gas from exhanst gas outlet 4; In said process, the SO in the flue gas
2The sulfate that generates with ammonia gas react is deposited on the catalyst, causes catalysqt deactivation.
Stop the catalyst denitration work of the Benitration reactor of inactivation; Start other Benitration reactor simultaneously and carry out above-mentioned denitration reaction; And with regeneration gas feed catalyst the Benitration reactor of inactivation carry out catalyst regeneration; The regeneration gas here can be high temperature and the stable gas of chemical property, generally adopts 300 ℃ ~ 600 ℃ air, N
2Or cleaning flue gases, in the regenerative process, decomposite SO
2And ammonia, the Benitration reactor after the regeneration is replaced the catalyst Benitration reactor of inactivation again, circulation repeatedly, and the gas that decompose the regeneration back (mainly is SO
2And ammonia) discharges from Benitration reactor.
The regeneration gas of discharging feeds washing cooling towers 7 through regeneration gas outlet 5, and sprays into steam and air, makes SO
2, ammonia steam and airborne oxygen reacts to each other, and generates ammonium sulfate.Above-mentioned ammonium sulfate flows out from product outlet 72, after blocked up thick device, centrifuge 9, drier 10 are handled, obtains ammonium sulfate product through product outlet 11.
Two Benitration reactors in the foregoing description, many Benitration reactors also are same mode of operations, its experience " come into operation-withdraw from-regenerate-comes into operation " and circulates repeatedly.
The low temperature catalyst that can select for use in the present embodiment refers to and can carry out the efficient catalytic catalyst for reaction at 80-200 ℃, and it can be ETX-3 type low-temperature denitration catalyst that Wuhan company produces; The RN-372 low-temperature denitration catalyst that Lanzhou chemical industry New Tech S. R. L. produces; And patent publication No. is respectively the low-temperature denitration catalyst of CN101767003A, CN102008956A, CN101352681 etc.
Claims (4)
1. a coal-burning boiler low-temperature SCR fixed bed equipment for denitrifying flue gas is characterized in that, comprises smoke inlet, regeneration gas inlet, ammonia inlet, exhanst gas outlet, regeneration gas outlet;
Comprise Benitration reactor, this Benitration reactor is more than two, and fixed bed is set in the Benitration reactor, and catalyst is set on the fixed bed, and the fixed bed below is provided with gas distributor;
Smoke inlet, ammonia inlet and regeneration gas inlet connect the Benitration reactor bottom, and Benitration reactor top is provided with exhanst gas outlet and regeneration gas outlet.
2. coal-burning boiler low-temperature SCR fixed bed equipment for denitrifying flue gas as claimed in claim 1 is characterized in that, the regeneration gas outlet connects the washing cooling tower, and washing cooling tower top is provided with the regeneration gas evacuation port, and washing cooling tower bottom is provided with the product outlet.
3. coal-burning boiler low-temperature SCR fixed bed equipment for denitrifying flue gas as claimed in claim 2 is characterized in that, the product outlet connects thick thick device, and thick thick device connects centrifuge, and centrifuge connects drier, and drier is provided with product outlet.
4. like the arbitrary described coal-burning boiler low-temperature SCR fixed bed equipment for denitrifying flue gas of claim 1-3, it is characterized in that this catalyst is a 80-200 ℃ of low temperature catalyst.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220228188 CN202590630U (en) | 2012-05-18 | 2012-05-18 | Coal-fired boiler low-temperature selective catalytic reduction (SCR) fixed bed smoke denitration device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220228188 CN202590630U (en) | 2012-05-18 | 2012-05-18 | Coal-fired boiler low-temperature selective catalytic reduction (SCR) fixed bed smoke denitration device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202590630U true CN202590630U (en) | 2012-12-12 |
Family
ID=47308212
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220228188 Expired - Lifetime CN202590630U (en) | 2012-05-18 | 2012-05-18 | Coal-fired boiler low-temperature selective catalytic reduction (SCR) fixed bed smoke denitration device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202590630U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102658013A (en) * | 2012-05-18 | 2012-09-12 | 中国电力工程顾问集团华北电力设计院工程有限公司 | Low-temperature selective catalytic reduction (SCR) fixed bed flue gas denitrification device and method for coal-fired boiler |
| CN104258673A (en) * | 2014-09-18 | 2015-01-07 | 中冶焦耐工程技术有限公司 | Middle-low-temperature flue gas desulfurization, dedusting and denitration and denitration catalyst thermal-desorption integrated device |
| CN104399371A (en) * | 2014-11-20 | 2015-03-11 | 中冶焦耐工程技术有限公司 | Medium and low temperature denitration, dedusting and thermo-analysis integrated method and device |
| CN104587812A (en) * | 2015-01-14 | 2015-05-06 | 北京贞吉环保科技有限公司 | Flue gas low-temperature efficient integrated desulfurization and denitrification method and system |
-
2012
- 2012-05-18 CN CN 201220228188 patent/CN202590630U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102658013A (en) * | 2012-05-18 | 2012-09-12 | 中国电力工程顾问集团华北电力设计院工程有限公司 | Low-temperature selective catalytic reduction (SCR) fixed bed flue gas denitrification device and method for coal-fired boiler |
| CN104258673A (en) * | 2014-09-18 | 2015-01-07 | 中冶焦耐工程技术有限公司 | Middle-low-temperature flue gas desulfurization, dedusting and denitration and denitration catalyst thermal-desorption integrated device |
| CN104258673B (en) * | 2014-09-18 | 2016-04-06 | 中冶焦耐工程技术有限公司 | The denitration of middle low-temperature flue gas desulfurization and dedusting and denitrating catalyst Thermal desorption integrated apparatus |
| CN104399371A (en) * | 2014-11-20 | 2015-03-11 | 中冶焦耐工程技术有限公司 | Medium and low temperature denitration, dedusting and thermo-analysis integrated method and device |
| CN104587812A (en) * | 2015-01-14 | 2015-05-06 | 北京贞吉环保科技有限公司 | Flue gas low-temperature efficient integrated desulfurization and denitrification method and system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102658013A (en) | Low-temperature selective catalytic reduction (SCR) fixed bed flue gas denitrification device and method for coal-fired boiler | |
| CN101422691B (en) | Multi-pollutant removing technique and device of fuel coal smoke | |
| CN203501199U (en) | NOx-controlled denitrification device of glass kiln | |
| CN102008893A (en) | Low temperature SCR moving bed flue gas denitration method for coal-fired boiler | |
| CN201529487U (en) | Gas cleaning device for liquid phase catalysis de-nitration | |
| CN102489149A (en) | Flue-gas purification and reclamation system and method thereof | |
| CN101279186B (en) | Flue gas dry-type method for simultaneously desulfurizing and denitrating | |
| CN103908892B (en) | A kind of swinging HC-SCR Benitration reactor | |
| CN102133547B (en) | Ozone treatment regeneration method and device for vanadium titanium-based flue gas denitration catalyst | |
| CN104826489B (en) | A kind of combined desulfurization and denitration fluidized bed plant based on activated carbon and low temperature catalyst | |
| CN110787630A (en) | Flue gas treatment device and process for semi-dry desulfurization and low-temperature SCR denitration of carbide slag | |
| CN105536886A (en) | Regeneration method of arsenic poisoning denitration catalyst | |
| CN105148701A (en) | Gas phase oxidization system, flue gas purification equipment using system and purification method thereof | |
| CN202590630U (en) | Coal-fired boiler low-temperature selective catalytic reduction (SCR) fixed bed smoke denitration device | |
| CN203043829U (en) | Flue gas desulfurization-denitration tower based on active carbon | |
| CN106955589A (en) | A kind of boiler smoke simultaneous SO_2 and NO removal device | |
| CN203090757U (en) | Desulfurization and denitrification system for boiler smoke | |
| CN102847430B (en) | System and technology for cleaning flue gas | |
| CN104587812A (en) | Flue gas low-temperature efficient integrated desulfurization and denitrification method and system | |
| CN102909104A (en) | Thermal regeneration method and device of SCR (selective catalytic reduction) denitration catalyst | |
| CN204352726U (en) | Water coal-pulp smoke cleaning system | |
| CN205730893U (en) | A kind of low-temperature denitration semi-dry desulphurization dedusting also ensures the system that chimney is hot standby | |
| CN204395780U (en) | A kind of combined desulfurization and denitration fluidized bed plant based on active carbon and low temperature catalyst | |
| CN203389527U (en) | Low-temperature multi-effect flue gas treatment device | |
| CN207430010U (en) | A kind of SCR denitration system of two-stage reactor series connection |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: CHINA POWER ENGINEERING CONSULTING GROUP NORTH CHI Free format text: FORMER NAME: NORTH CHINA ELECTRIC POWER DESIGN INSTITUTE OF CHINA POWER ENGINEERING CONSULTING GROUP CORPORATION |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 100120 Beijing city Xicheng District Street No. 24 Patentee after: NORTH CHINA POWER ENGINEERING CO., LTD. OF CHINA POWER ENGINEERING CONSULTING GROUP Address before: 100120 Beijing city Xicheng District Street No. 24 Patentee before: North China Electric Power Design Institute of China Power Engineering Consulting Group Corporation |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121212 |