CN204637941U - A kind of CFB boiler SNCR and SCR combined denitration device - Google Patents
A kind of CFB boiler SNCR and SCR combined denitration device Download PDFInfo
- Publication number
- CN204637941U CN204637941U CN201520197252.8U CN201520197252U CN204637941U CN 204637941 U CN204637941 U CN 204637941U CN 201520197252 U CN201520197252 U CN 201520197252U CN 204637941 U CN204637941 U CN 204637941U
- Authority
- CN
- China
- Prior art keywords
- scr
- sncr
- end ductwork
- cyclone separator
- spray gun
- 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.)
- Active
Links
Landscapes
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The utility model discloses a kind of CFB boiler SNCR and SCR combined denitration device, be made up of the cyclone separator be connected successively, back-end ductwork, economizer and air preheater, ground floor spray gun is provided with in the pipeline that described cyclone separator is connected with back-end ductwork, be provided with second layer spray gun in described back-end ductwork, in the pipeline between described economizer and air preheater, be provided with catalyst-assembly.The utility model has the advantages that: make denitration efficiency reach 70% ~ 90%, guarantee NOx qualified discharge, the escape of final ammonia is less than 3ppm, and comparatively SCR is low in the generation of ammonium hydrogen sulfate, the probability resulted in blockage or corrode is lower than SCR, the pressure loss of generation and more catalyst changeout cost is lower.
Description
Technical field
The utility model relates to a kind of CFB boiler SNCR and SCR combined denitration device.
Background technology
Usual CFB Denitration in Boiler adopts selective catalytic reduction (SCR) or selective non-catalytic reduction (SNCR).
Selective catalytic reduction (SCR) refers under catalyst and oxygen existent condition, in lower temperature range (280 ~ 420 DEG C), reducing agent (NH3, urea), under two layers or three layers of catalyst action, optionally reacts with NOx and generates N
2and H
2o reduces the technology of NOx emission.Advantage is that denitration rate can be greater than 80%, and amount of ammonia slip is less, NH
3consumption compares optimization.
Selective non-catalytic reduction (SNCR) does not adopt catalyst, and reducing agent is identical with SCR, is also NH
3, urea.SNCR reducing agent sprays in 800-1050 DEG C of region in burner hearth (or CFB boiler cyclone separator), and reducing agent decomposes rapidly in stove, selectively reacts generate harmless N with the NOx in flue gas
2and H
2o.Advantage is that cost of investment is lower, is relatively applicable to transforming the SNCR of existing boiler.
Selective catalytic reduction (SCR) shortcoming is that design comparison is complicated, must installation two layers or three layers of catalyst when needs reach higher denitration efficiency, equipment investment and operating cost higher.Time particularly to original boiler De-NO_x, owing to installing two layers or three layers of catalyst need larger installing space, usually need SCR catalyst layer, air preheater to move on to outside, structure is comparatively complicated, and cost of investment is high.On the other hand, containing a large amount of CaO, the SO in the effect lower part flue gas of catalyst in CFB boiler smoke
2sO can be oxidized to
3, SO
3react with CaO and generate CaSO
42H
2o, SO
3also can with NH
3reaction generates one more strongly adherent material NH
4hSO
4, NH
4hSO
4and CaSO
42H
2o can deposit at catalyst surface, covers catalyst activity surface, causes catalyst to work.
Selective non-catalytic reduction (SNCR) shortcoming is that ammonia consumption is high, and amount of ammonia slip is comparatively large, and the difficulty mixed is large, and its denitration rate is lower, only has 40 ~ 60%.
Utility model content
The purpose of this utility model is to provide a kind of CFB boiler SNCR and SCR combined denitration device, effectively can solve existing CFB boiler SNCR or SCR denitration design is complicated, ammonia consumption is larger problem.
In order to solve the problems of the technologies described above, the utility model is achieved through the following technical solutions: a kind of CFB boiler SNCR and SCR combined denitration device, the assembly be connected by next coming in order forms: cyclone separator, back-end ductwork, economizer and air preheater, described cyclone separator is connected with burner hearth, the ground floor spray gun carrying out SNCR is provided with in the pipeline that described cyclone separator is connected with back-end ductwork, be provided with the second layer spray gun carrying out SNCR in described back-end ductwork, in the pipeline between described economizer and air preheater, be provided with the catalyst-assembly carrying out SCR.
Preferably, described ground floor spray gun is arranged in the region of flue-gas temperature 800 ~ 1050 DEG C in pipeline that cyclone separator is connected with back-end ductwork; Because when temperature is higher than 1050 DEG C, NH
3can NO be oxidized to, cause NO on the contrary
xconcentration of emission increases; And when temperature is lower than 800 DEG C, not exclusively, can cause so-called " ammonia penetrates ", the escaping of ammonia rate is high in reaction, cause SNCR to react not exclusively, therefore ground floor spray gun is arranged on this temperature province.
Preferably, described second layer spray gun is arranged in the region of flue-gas temperature 650 ~ 800 DEG C in back-end ductwork; Because in this temperature province, be conducive to flashing to ammonia, and the ammoniacal liquor sprayed into or urea do not carry out SNCR reaction, directly flash to ammonia and enter SCR reaction zone and react, be equivalent to save ammonia vaporising device.
Compared with prior art, the utility model has the advantages that: overcome conventional SCR denitration technology and the defect of SNCR denitration technology, denitration efficiency is made to reach 70% ~ 90%, guarantee NOx qualified discharge, the escape of final ammonia is less than 3ppm, decreases the waste of reducing agent, comparatively SCR is low in the generation of simultaneously ammonium hydrogen sulfate, the probability resulted in blockage or corrode is lower than SCR, and the pressure loss of generation is lower, and more catalyst changeout cost is lower.
When CFB Denitration in Boiler is transformed, do not need newly-increased SCR reaction unit, only at former flue, economizer is transformed, air preheater sinks, reserve the installing space of one deck catalyst, catalyst arrangement one deck, be arranged on the straight flue between economizer and air preheater, it is time saving and energy saving to transform, and decreases input.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model a kind of CFB boiler SNCR and SCR combined denitration device.
Detailed description of the invention
Consult the embodiment that Fig. 1 is the utility model a kind of CFB boiler SNCR and SCR combined denitration device, a kind of CFB boiler SNCR and SCR combined denitration device, the assembly be connected by next coming in order forms: cyclone separator 2, back-end ductwork 4, economizer 6 and air preheater 8, described cyclone separator 2 is connected with burner hearth, in the pipeline that described cyclone separator 2 is connected with back-end ductwork 4 flue-gas temperature 800 ~ 1050 DEG C region in be provided with the ground floor spray gun 3 carrying out SNCR, in described back-end ductwork 4 flue-gas temperature 650 ~ 800 DEG C region in be provided with the second layer spray gun 5 carrying out SNCR, the catalyst-assembly 7 carrying out SCR is provided with in pipeline between described economizer 6 and air preheater 8.
The technique of a kind of CFB boiler SNCR and SCR combined denitration device, flue gas containing NOx from boiler furnace out, through cyclone separator 2, ground floor spray gun 3 in cyclone separator 2 outlet conduit sprays into urea liquid or ammoniacal liquor, carry out SNCR denitration reaction, the key reaction of SNCR denitrating flue gas is:
Using ammoniacal liquor as the main chemical reactions of reducing agent reducing NOx be: 4NH
3+ 4NO+O
2→ 4N
2+ 6H
2o
Using urea as the main chemical reactions of reducing agent reducing NOx be: (NH
2)
2cO → 2NH
2+ CO
NH
2+NO→N
2+H
2O
CO+NO→N
2+CO
2
Back-end ductwork 4 is entered through the reacted flue gas of SNCR denitration, second layer spray gun 5 in back-end ductwork 4 sprays into urea liquid or ammoniacal liquor, pyrolysis or evaporation after become ammonia after enter economizer 6, again by carrying out the catalyst-assembly 7 of SCR, unreacted NOx carries out catalytic reduction reaction at this, and NOx is reduced to N
2, key reaction is as follows:
4NO+4NH
3+O
2→4N
2+6H
2O
NO+NO
2+2NH
3→2N
2+3H
2O
6NO
2+8NH
3→7N
2+12H
2O
Flue gas after reaction treatment enters air preheater 8.
Overcome conventional SCR denitration technology and the defect of SNCR denitration technology, denitration efficiency is made to reach 70% ~ 90%, guarantee NOx qualified discharge, the escape of final ammonia is less than 3ppm, decrease the waste of reducing agent, comparatively SCR is low in the generation of simultaneously ammonium hydrogen sulfate, result in blockage or the probability of corroding lower than SCR, the pressure loss produced is lower, and more catalyst changeout cost is lower.
When CFB Denitration in Boiler is transformed, do not need newly-increased SCR reaction unit, only at former flue, economizer 6 is transformed, air preheater 8 sinks, reserve the installing space of one deck catalyst, catalyst arrangement one deck, be arranged on the straight flue between economizer 6 and air preheater 8, it is time saving and energy saving to transform, and decreases input.
The foregoing is only specific embodiment of the utility model, but technical characteristic of the present utility model is not limited thereto, any those skilled in the art is in field of the present utility model, and the change done or modification are all encompassed among the scope of the claims of the present utility model.
Claims (3)
1. a CFB boiler SNCR and SCR combined denitration device, it is characterized in that: the assembly be connected by next coming in order forms: cyclone separator (2), back-end ductwork (4), economizer (6) and air preheater (8), described cyclone separator (2) is connected with burner hearth, the ground floor spray gun (3) carrying out SNCR is provided with in the pipeline that described cyclone separator (2) is connected with back-end ductwork (4), the second layer spray gun (5) carrying out SNCR is provided with in described back-end ductwork (4), the catalyst-assembly (7) carrying out SCR is provided with in pipeline between described economizer (6) and air preheater (8).
2. a kind of CFB boiler SNCR as claimed in claim 1 and SCR combined denitration device, is characterized in that: described ground floor spray gun (3) is arranged in the region of flue-gas temperature 800 ~ 1050 DEG C in pipeline that cyclone separator (2) is connected with back-end ductwork (4).
3. a kind of CFB boiler SNCR as claimed in claim 1 and SCR combined denitration device, is characterized in that: described second layer spray gun (5) is arranged in the region of the interior flue-gas temperature of back-end ductwork (4) 650 ~ 800 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520197252.8U CN204637941U (en) | 2015-04-02 | 2015-04-02 | A kind of CFB boiler SNCR and SCR combined denitration device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520197252.8U CN204637941U (en) | 2015-04-02 | 2015-04-02 | A kind of CFB boiler SNCR and SCR combined denitration device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204637941U true CN204637941U (en) | 2015-09-16 |
Family
ID=54090718
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520197252.8U Active CN204637941U (en) | 2015-04-02 | 2015-04-02 | A kind of CFB boiler SNCR and SCR combined denitration device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204637941U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
-
2015
- 2015-04-02 CN CN201520197252.8U patent/CN204637941U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104785080A (en) | SNCR and SCR combined denitration device and process | |
| CN106237851A (en) | A kind of utilize ozone to carry out SCR denitration to carry the System and method for of effect | |
| CN208990564U (en) | A kind of integrated fume denitration heat exchanger loading denitrating catalyst | |
| CN203123795U (en) | Flue gas denitration device using ozone oxidation method | |
| CN102160961A (en) | Dielectric barrier discharge reactor, fume desulfurization and denitration system and desulfurizating and denitrating process | |
| CN103551033A (en) | Scr denitration device and flue gas denitration method | |
| CN111249873A (en) | Device and method for dry desulfurization and SCR low-temperature denitration of lime kiln flue gas SDS | |
| CN204637941U (en) | A kind of CFB boiler SNCR and SCR combined denitration device | |
| CN102961954B (en) | Exhaust gas NOx emission reduction device of cement kiln | |
| CN106390729B (en) | Desulfurization and denitrification oil field steam injection boiler and method | |
| CN203090728U (en) | Simultaneous smoke desulfurization and denitrification device and ammonia fog absorption tower | |
| CN104785092A (en) | An SNCR flue gas denitration device | |
| CN203525567U (en) | SCR (Selective Catalytic Reduction) denitration device | |
| CN115090091B (en) | Device and method for removing escaped ammonia in waste incineration flue gas by using citric acid | |
| CN205007853U (en) | Improved generation SCR ozone denitrification facility | |
| CN206045789U (en) | A kind of utilization ozone carries out the system that SCR denitration puies forward effect | |
| CN204973512U (en) | Improved generation SNCR+ ozone flue gas denitration device | |
| CN204601975U (en) | Dust-removal and desulfurizing denitration oxidation tank | |
| KR20090084055A (en) | The reduction agent injection system for increasing nh3 evolution in sncr process | |
| CN102698600A (en) | System for intelligently controlling flue gas denitrification of cement plant based on selective catalytic reduction (SCR) method | |
| CN210186849U (en) | Pre-oxidation laminar flow atomization system | |
| CN211069654U (en) | Two-stage ammonia injection combined denitration system | |
| CN208720184U (en) | A kind of waste heat boiler of nitrogen oxides minimum discharge | |
| CN204147752U (en) | A kind of CFBB Novel desulphurization denitrating system | |
| CN202356010U (en) | Flue gas desulfurization and denitration integrated device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |