CN202315668U - Ammonia injection mixing system for selective catalytic reduction (SCR) denitration device - Google Patents
Ammonia injection mixing system for selective catalytic reduction (SCR) denitration device Download PDFInfo
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- CN202315668U CN202315668U CN2011204924477U CN201120492447U CN202315668U CN 202315668 U CN202315668 U CN 202315668U CN 2011204924477 U CN2011204924477 U CN 2011204924477U CN 201120492447 U CN201120492447 U CN 201120492447U CN 202315668 U CN202315668 U CN 202315668U
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Abstract
The utility model discloses an ammonia injection mixing system for a selective catalytic reduction (SCR) denitration device. The ammonia injection mixing system comprises ammonia injection gratings and flow equalization tubes which are arranged in an inlet flue of an SCR reactor; and the flow equalization tubes are positioned on the rear sides of the ammonia injection gratings along a smoke flow direction and are parallel on the cross section of the inlet flue and arranged at equal intervals. According to the ammonia injection mixing system, the structure involving the ammonia injection gratings and the flow equalization tubes is adopted, so that the flow equalization tubes can be used for equalizing and mixing smoke and ammonia, and the flow field of the smoke and the ammonia is uniformly distributed; the smoke and ammonia mixing effect is enhanced, so that the mixture of the smoke and the ammonia can reach a proper speed field and a proper concentration field at the inlet of a catalyst layer, and the denitration efficiency is improved; furthermore, a flow guide plate comprising a circular arc section and a straight plate section is adopted, so that the flow field of the mixture of the smoke and the ammonia is further uniformly distributed; and the system pressure loss is reduced at the same time.
Description
Technical field
The utility model belongs to SCR gas denitrifying technology field, is specifically related to a kind of ammonia spraying and mixing system of SCR equipment for denitrifying flue gas.
Background technology
Gas denitrifying technology mainly contains selective catalytic reduction (SCR) etc.; The SCR technology is at first put forward by the American in the fifties in last century the earliest; U.S. Eegelhard company in nineteen fifty-nine applied for should technology patent of invention; 1972 begin formal research and development in Japan, and have realized industrial applications in 1978.SCR denitrating flue gas reaction principle is under catalyst action, 250 ~ 450 ℃ of reaction temperatures and O
2Under the existence condition, with ammonia, CO or hydrocarbon etc. as reducing agent, with the NO in the flue gas
XBe reduced to N
2, the key reaction equation of SCR method gas denitrifying technology is following:
4NO+4NH
3+O
2→?4N
2+6H
2O
6NO
2+8NH
3?→7N
2+12H
2O
Can be used as the NH that has of SCR reaction reducing agent
3, CO, H
2, also have methane, ethene, propane, third rare etc., the NO that can access as reducing gases the time with ammonia
XRemoval efficiency the highest.
In the running of SCR equipment for denitrifying flue gas, for avoiding too high NO
XDischarging and too high amount of ammonia slip improve system's denitration efficiency, require the Flow Field Distribution of flue gas and ammonia even, flue gas and the full and uniform mixing of ammonia in the flue.Therefore; For the SCR equipment for denitrifying flue gas; Spraying into of ammonia is one of core system of this device with hybrid system, needs constantly be optimized and improve it, so that the Flow Field Distribution of flue gas and ammonia is even; Improve the mixed effect of interior flue gas of flue and ammonia, make the mixed mixed flue gas of flue gas and ammonia reach proper speed field and concentration field at the catalyst layer inlet.
Summary of the invention
In view of this; The utility model provides a kind of ammonia spraying and mixing system of SCR equipment for denitrifying flue gas; Make the Flow Field Distribution of flue gas and ammonia even; Improve the mixed effect of interior flue gas of flue and ammonia, make the mixed mixed flue gas of flue gas and ammonia reach proper speed field and concentration field at the catalyst layer inlet.
The ammonia spraying and mixing system of the SCR equipment for denitrifying flue gas of the utility model; Comprise ammonia-spraying grid and current-sharing pipe; Said ammonia-spraying grid and current-sharing pipe are arranged in the gas approach of SCR reactor; Said current-sharing pipe is positioned at the ammonia-spraying grid rear side along the flow of flue gas direction, and said current-sharing pipe is parallel and evenly be spaced on the cross section of gas approach.
Further, said current-sharing pipe is two-layer, two-layer current-sharing pipe be parallel to each other and one deck current-sharing pipe over against the space between another layer current-sharing pipe;
Further, the caliber of said current-sharing pipe is 80 ~ 120mm;
Further, said ammonia-spraying grid comprises spray ammonia pipe, and said spray ammonia pipe is parallel and evenly be spaced on the cross section of gas approach, and spray ammonia hole evenly is set on the said spray ammonia pipe vertically;
Further, said ammonia-spraying grid and current-sharing pipe are arranged in the vertical flue section of gas approach;
Further, also comprise deflector, said baffle arrangement is in the turning of gas approach, and said deflector comprises arc section and straight plate section, and the position of said arc section is corresponding with the turning of gas approach, and the position of said straight plate section is corresponding with the straight section of gas approach.
The beneficial effect of the utility model is: the ammonia spraying and mixing system of the utility model has adopted ammonia-spraying grid to add the structure of current-sharing pipe; Through the current-sharing immixture of current-sharing pipe to flue gas and ammonia; Make the Flow Field Distribution of flue gas and ammonia more even; Improved flue gas and ammonia mixed effect, made the mixed mixed flue gas of flue gas and ammonia can reach proper speed field and concentration field, improved denitration efficiency at the catalyst layer inlet; In addition, comprise through setting the deflector of arc section and straight plate section further making the Flow Field Distribution of mixed flue gas even, reduced system's crushing simultaneously.
Description of drawings
For the purpose, technical scheme and the advantage that make the utility model is clearer, will combine accompanying drawing that the utility model is done further to describe in detail below, wherein:
Fig. 1 is the structural representation of the utility model;
Fig. 2 is the vertical view of current-sharing pipe;
Fig. 3 is the side view of current-sharing pipe;
Fig. 4 is the vertical view of ammonia-spraying grid;
Fig. 5 is the side view of ammonia-spraying grid.
The specific embodiment
Hereinafter with reference to accompanying drawing, the preferred embodiment of the utility model is described in detail.
Fig. 1 is the structural representation of the utility model; Fig. 2 is for the vertical view of current-sharing pipe, and is as shown in the figure, the ammonia spraying and mixing system of the SCR equipment for denitrifying flue gas of the utility model; Comprise ammonia-spraying grid 1 and current-sharing pipe 2; Said ammonia-spraying grid 1 is arranged in the gas approach 5 of SCR reactor 4 with current-sharing pipe 2, and said current-sharing pipe 2 is positioned at ammonia-spraying grid 1 rear side along the flow of flue gas direction, and said current-sharing pipe 2 is parallel and evenly be spaced on the cross section of gas approach 5; Current-sharing immixture through 2 pairs of flue gases of current-sharing pipe and ammonia makes the Flow Field Distribution of flue gas and ammonia more even, has improved flue gas and ammonia mixed effect.
As the further improvement of the utility model, as shown in Figure 3, said current-sharing pipe 2 is two-layer, two-layer current-sharing pipe 2 be parallel to each other and one deck current-sharing pipe 2 over against the space of 2 of another layer current-sharing pipes; The current-sharing pipe 2 of two-layer interlaced arrangement has further improved the current-sharing mixed effect; The preferred caliber of said current-sharing pipe 2 is 80 ~ 120mm.
As the further improvement of the utility model, like Fig. 4 and shown in Figure 5, said ammonia-spraying grid 1 comprises spray ammonia pipe 1a, and said spray ammonia pipe 1a is parallel and evenly be spaced on the cross section of gas approach 5, and spray ammonia hole 1b evenly is set on the said spray ammonia pipe 1a vertically; Make spray ammonia hole 1b multiple spot on the entire cross section of gas approach 5 evenly arrange, in the present embodiment, every 0.263m
2Arrange a spray ammonia hole 1b on the area, make the Flow Field Distribution of ammonia more even.
In the present embodiment, said ammonia-spraying grid 1 is arranged in the vertical flue section of gas approach 5 with current-sharing pipe 2.
Further improvement as the utility model; Also comprise deflector 3; Said deflector 3 is arranged in the turning of gas approach 5; Said deflector 3 comprises arc section and straight plate section, and the position of said arc section is corresponding with the turning of gas approach 5, and the position of said straight plate section is corresponding with the straight section of gas approach 5; Mixed flue gas carries out water conservancy diversion through deflector 3 and distributes, and further makes the Flow Field Distribution of mixed flue gas even, and the straight plate section of deflector 3 reduces the separation of mixed flue gas behind the process flow guide system simultaneously, thereby has reduced system's crushing.
Explanation is at last; Above embodiment is only unrestricted in order to the technical scheme of explanation the utility model; Although the preferred embodiment through with reference to the utility model is described the utility model; But those of ordinary skill in the art should be appreciated that and can make various changes to it in form with on the details, and the spirit and the scope of the utility model that does not depart from appended claims and limited.
Claims (6)
1. the ammonia spraying and mixing system of a SCR equipment for denitrifying flue gas; It is characterized in that: comprise ammonia-spraying grid (1) and current-sharing pipe (2); Said ammonia-spraying grid (1) and current-sharing pipe (2) are arranged in the gas approach (5) of SCR reactor (4); Said current-sharing pipe (2) is positioned at ammonia-spraying grid (1) rear side along the flow of flue gas direction, and said current-sharing pipe (2) is parallel and evenly be spaced on the cross section of gas approach (5).
2. the ammonia spraying and mixing system of SCR equipment for denitrifying flue gas according to claim 1 is characterized in that: said current-sharing pipe (2) is for two-layer, two-layer current-sharing pipe (2) be parallel to each other and one deck current-sharing pipe (2) over against the space between another layer current-sharing pipe (2).
3. the ammonia spraying and mixing system of SCR equipment for denitrifying flue gas according to claim 2 is characterized in that: the caliber of said current-sharing pipe (2) is 80 ~ 120mm.
4. the ammonia spraying and mixing system of SCR equipment for denitrifying flue gas according to claim 1; It is characterized in that: said ammonia-spraying grid (1) comprises spray ammonia pipe (1a); Said spray ammonia pipe (1a) is parallel and evenly be spaced on the cross section of gas approach (5), and spray ammonia hole (1b) evenly is set on the said spray ammonia pipe (1a) vertically.
5. the ammonia spraying and mixing system of SCR equipment for denitrifying flue gas according to claim 1 is characterized in that: said ammonia-spraying grid (1) and current-sharing pipe (2) are arranged in the vertical flue section of gas approach (5).
6. according to the ammonia spraying and mixing system of any described SCR equipment for denitrifying flue gas of claim 1 to 5; It is characterized in that: also comprise deflector (3); Said deflector (3) is arranged in the turning of gas approach (5); Said deflector (3) comprises arc section and straight plate section, and the position of said arc section is corresponding with the turning of gas approach (5), and the position of said straight plate section is corresponding with the straight section of gas approach (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204924477U CN202315668U (en) | 2011-12-01 | 2011-12-01 | Ammonia injection mixing system for selective catalytic reduction (SCR) denitration device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204924477U CN202315668U (en) | 2011-12-01 | 2011-12-01 | Ammonia injection mixing system for selective catalytic reduction (SCR) denitration device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202315668U true CN202315668U (en) | 2012-07-11 |
Family
ID=46427670
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204924477U Expired - Lifetime CN202315668U (en) | 2011-12-01 | 2011-12-01 | Ammonia injection mixing system for selective catalytic reduction (SCR) denitration device |
Country Status (1)
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|---|---|
| CN (1) | CN202315668U (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103007749A (en) * | 2012-12-12 | 2013-04-03 | 盐城工学院 | Guiding device and guiding method for uniformly distributed flow field of pi type SCR (Selective Catalytic Reduction) denitrification reactor |
| CN104607043A (en) * | 2015-01-19 | 2015-05-13 | 大唐科技产业集团有限公司 | Novel flow guide device for preventing catalyst in combined-wall denitrification reactor from abrasion |
| CN104624072A (en) * | 2015-02-11 | 2015-05-20 | 中国华能集团公司 | Flue gas premixing device and denitration reactor and method based on same |
| CN106039991A (en) * | 2016-07-07 | 2016-10-26 | 大唐环境产业集团股份有限公司 | Method and apparatus for homogenizing SCR (selective catalytic reduction) denitration system flue flow field |
| CN107126835A (en) * | 2017-06-09 | 2017-09-05 | 中国联合工程公司 | A kind of SCR denitration ammonification and even flow field structure and its operation method |
| CN107824044A (en) * | 2017-12-01 | 2018-03-23 | 山西大学 | A kind of flow fieldoptimization device of apparatus of thermo-electric power boiler denitrating system |
| CN109395576A (en) * | 2018-09-14 | 2019-03-01 | 哈尔滨锅炉厂有限责任公司 | The guiding device of SCR denitration device |
| CN111841321A (en) * | 2020-07-17 | 2020-10-30 | 西安西矿环保科技有限公司 | Flue gas denitration mixing arrangement |
| CN112178667A (en) * | 2020-10-16 | 2021-01-05 | 南京博沃科技发展有限公司 | Ash field treatment structure for SCR outlet downstream heating surface |
-
2011
- 2011-12-01 CN CN2011204924477U patent/CN202315668U/en not_active Expired - Lifetime
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103007749A (en) * | 2012-12-12 | 2013-04-03 | 盐城工学院 | Guiding device and guiding method for uniformly distributed flow field of pi type SCR (Selective Catalytic Reduction) denitrification reactor |
| CN104607043A (en) * | 2015-01-19 | 2015-05-13 | 大唐科技产业集团有限公司 | Novel flow guide device for preventing catalyst in combined-wall denitrification reactor from abrasion |
| CN104607043B (en) * | 2015-01-19 | 2017-05-03 | 大唐环境产业集团股份有限公司 | Novel flow guide device for preventing catalyst in combined-wall denitrification reactor from abrasion |
| CN104624072A (en) * | 2015-02-11 | 2015-05-20 | 中国华能集团公司 | Flue gas premixing device and denitration reactor and method based on same |
| CN106039991B (en) * | 2016-07-07 | 2019-09-03 | 大唐环境产业集团股份有限公司 | A kind of SCR denitration system flue gas duct homogenization method and device |
| CN106039991A (en) * | 2016-07-07 | 2016-10-26 | 大唐环境产业集团股份有限公司 | Method and apparatus for homogenizing SCR (selective catalytic reduction) denitration system flue flow field |
| CN107126835A (en) * | 2017-06-09 | 2017-09-05 | 中国联合工程公司 | A kind of SCR denitration ammonification and even flow field structure and its operation method |
| CN107824044A (en) * | 2017-12-01 | 2018-03-23 | 山西大学 | A kind of flow fieldoptimization device of apparatus of thermo-electric power boiler denitrating system |
| CN107824044B (en) * | 2017-12-01 | 2023-09-22 | 山西大学 | Flow field optimizing device of thermal power boiler denitration system |
| CN109395576A (en) * | 2018-09-14 | 2019-03-01 | 哈尔滨锅炉厂有限责任公司 | The guiding device of SCR denitration device |
| CN111841321A (en) * | 2020-07-17 | 2020-10-30 | 西安西矿环保科技有限公司 | Flue gas denitration mixing arrangement |
| CN112178667A (en) * | 2020-10-16 | 2021-01-05 | 南京博沃科技发展有限公司 | Ash field treatment structure for SCR outlet downstream heating surface |
| CN112178667B (en) * | 2020-10-16 | 2022-03-22 | 南京博沃科技发展有限公司 | Ash field treatment structure for SCR outlet downstream heating surface |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120711 |