CN105311959A - Ammonia spraying grid for low-temperature SCR denitrification system - Google Patents
Ammonia spraying grid for low-temperature SCR denitrification system Download PDFInfo
- Publication number
- CN105311959A CN105311959A CN201510904124.7A CN201510904124A CN105311959A CN 105311959 A CN105311959 A CN 105311959A CN 201510904124 A CN201510904124 A CN 201510904124A CN 105311959 A CN105311959 A CN 105311959A
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- Prior art keywords
- ammonia
- spray ammonia
- ammonia spraying
- spraying grid
- arm
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 82
- 238000005507 spraying Methods 0.000 title claims abstract description 29
- 239000007921 spray Substances 0.000 claims description 48
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 239000000779 smoke Substances 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 15
- UGFAIRIUMAVXCW-UHFFFAOYSA-N carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 14
- 239000003546 flue gas Substances 0.000 description 14
- 238000005516 engineering process Methods 0.000 description 5
- 229910052813 nitrogen oxide Inorganic materials 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006011 modification reaction Methods 0.000 description 2
- 238000004056 waste incineration Methods 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N HCl Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000003247 decreasing Effects 0.000 description 1
- 239000003599 detergent Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910000041 hydrogen chloride Inorganic materials 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Abstract
The invention provides an ammonia spraying grid for a low-temperature SCR denitrification system. The ammonia spraying grid comprises a plurality of ammonia spraying branch pipes which are arranged at intervals d1; each ammonia spraying branch pipe comprises a plurality of ammonia spraying nozzles which are arranged at intervals d2. The ammonia spraying grid is characterized in that the ammonia spraying nozzles in the adjacent ammonia spraying branch pipes are arranged in a staggered manner. According to the ammonia spraying grid, the mixing effect of ammonia and smoke can be improved; improvement of the denitrification reaction efficiency is facilitated; and the ammonia escape rate is lowered.
Description
Technical field
The present invention relates to flue gas of garbage furnace cleaning system low temperature SCR denitration process field, in particular to the efficient ammonia-spraying grid of one.
Background technology
House refuse can produce a large amount of containing particle, HCl, SO in burning process
2, the harmful substance such as NOx, bioxin flue gas, along with the pay attention to day by day of Environmental protection, the requirement also increasingly stringent that nitrogen oxide (NOx) discharges.The technology being applicable to waste incineration denitration mainly contains SNCR method (SNCR) and selective catalytic reduction (SCR).The denitration efficiency of current SNCR denitration technology is between 30% ~ 60%, and the denitration efficiency of SCR denitration technology can reach more than 80%, consider the continuous lifting of environmental requirement, garbage incinerating power plant need implement efficient denitrification, and thus SCR becomes first-selected denitration technology.In recent years, low temperature SCR denitration system obtains extensive research, in conjunction with the actual conditions of burning power plant, after SCR system is arranged in sack cleaner, the flue-gas temperature of sack cleaner outlet is generally at 120 DEG C ~ 180 DEG C, therefore, low temperature SCR denitration system without the need to heating, decreased energy resource consumption significantly before flue gas enters SCR reactor.Ammonia-spraying grid is one of core component of low temperature SCR denitration system, because the mixing uniformity of ammonia and flue gas is most important to low temperature SCR denitration system, is the key factor affecting denitration efficiency.The Main Function of ammonia-spraying grid ammonia is sprayed into equably flue to mix with flue gas, when the skewness of ammonia and flue gas stream, easily causes regional area NOx and NH in flue
3mixing and react uneven, cause denitration efficiency to reduce, higher the escaping of ammonia rate can be produced simultaneously, corrosion subsequent pipeline and equipment.
Therefore, need to make improvement to existing ammonia-spraying grid, to solve the problem.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of ammonia-spraying grid for low temperature SCR denitration system, described ammonia-spraying grid comprises the multiple spray ammonia arms arranged by spacing d1, described spray ammonia arm has the multiple spray ammonia nozzles by spacing d2 arrangement, it is characterized in that, the spray ammonia designs of nozzles being arranged in adjacent spray ammonia arm is become interlaced arrangement.
In one example, described interlaced arrangement is as follows: for two adjacent described spray ammonia arms, on the spray ammonia nozzle of one of them the spray ammonia arm center line between two of another spray ammonia arm adjacent spray ammonia nozzles.
In one example, the front end of described spray ammonia arm is the structure of band cone angle.
In one example, described cone angle is 60 °.
In one example, described spacing d1 is 320mm, and described spacing d2 is 320mm, and the staggered displacement of described interlaced arrangement is 160mm.
According to the present invention, the mixed effect of ammonia and flue gas can be improved, be conducive to improving denitration reaction efficiency, reduce the escaping of ammonia rate.
Accompanying drawing explanation
Following accompanying drawing of the present invention in this as a part of the present invention for understanding the present invention.Shown in the drawings of embodiments of the invention and description thereof, be used for explaining principle of the present invention.
In accompanying drawing:
Figure 1A is the structural representation of the ammonia-spraying grid for waste incineration low temperature SCR denitration system that the present invention proposes;
Figure 1B props up the schematic side view of jet pipe for the list in the ammonia-spraying grid shown in Figure 1A;
The schematic cross sectional view of end band cone angle structure before the atomizer that Fig. 2 is the jet pipe shown in Figure 1B.
Detailed description of the invention
In the following description, a large amount of concrete details is given to provide more thorough understanding of the invention.But, it is obvious to the skilled person that the present invention can be implemented without the need to these details one or more.In other example, in order to avoid obscuring with the present invention, technical characteristics more well known in the art are not described.
In order to thoroughly understand the present invention, by following description, detailed step is proposed, so as to explain the present invention propose.Obviously, the specific details that the technical staff that execution of the present invention is not limited to semiconductor applications has the knack of.Preferred embodiment of the present invention is described in detail as follows, but except these are described in detail, the present invention can also have other embodiments.
Should be understood that, " comprise " when using term in this manual and/or " comprising " time, it indicates exists described feature, entirety, step, operation, element and/or assembly, but does not get rid of existence or additional other features one or more, entirety, step, operation, element, assembly and/or their combination.
[exemplary embodiment]
After there is spray ammonia for the existing ammonia-spraying grid for waste incinerated smoke purification system low temperature SCR denitration system, ammonia is uneven with smoke distribution in flue, the problem that when causing actual motion, denitration efficiency is low and catalyst consumption amount is large, the invention provides the heavy duty detergent ammonia-spraying grid of a kind of low temperature for SCR denitration process, ammonia nozzle interlaced arrangement will be sprayed, the front end of the spray ammonia nozzle after optimization has the spray angle being with the structure of cone angle to increase ammonia ejection, and then strengthen the mixing uniformity of ammonia and flue gas, effectively can improve the mixed effect of ammonia and flue gas, be conducive to improving denitration efficiency, reduce the escaping of ammonia rate.
As shown in Figure 1A, the ammonia-spraying grid that the present invention proposes comprises the multiple spray ammonia arms 2 arranged by spacing d1, spray ammonia arm 2 has the multiple spray ammonia nozzles 1 by spacing d2 arrangement, the spray ammonia nozzle 1 being arranged in adjacent spray ammonia arm 2 is designed to interlaced arrangement, such as, two adjacent spray ammonia arms 2, on the spray ammonia nozzle 1 of one of them spray ammonia arm 2 center line between two of another spray ammonia arm 2 adjacent spray ammonia nozzles 1, ammonia can be uniformly distributed after being sprayed by spray ammonia nozzle 1 in flue, ensure the mixture homogeneity of flue gas and ammonia, avoid spraying inequality by spray ammonia nozzle 1 and the local ammonia enrichment that produces.Simultaneously, design is optimized to the internal structure of spray ammonia nozzle 1, expand the angle of ejiction opening, improve ammonia ejection atomizing angle, increase ammonia area coverage, be conducive to the contact area increasing ammonia and flue gas, reach the object mixed, and then ensure fully to react with catalyst in SCR reactor, improve the removal efficiency of NOx, reduce the escape amount of ammonia.
As shown in Figure 1B, be the schematic side view of the spray ammonia arm 2 in the ammonia-spraying grid shown in Figure 1A, flue gas flows down from top and passes into SCR reactor with from spraying after the ammonia sprayed ammonia arm 2 mixes, and reaches the object of NO_x removal.For increasing the injection coverage rate of ammonia, be the structure of band cone angle as shown in Figure 2 by the Front-end Design of the spray ammonia nozzle 1 in spray ammonia arm 2.The best atomization cone angle being obtained the structure of described band cone angle by computational fluid dynamics (CFD) numerical simulation is 60 °, spacing d1 between multiple spray ammonia arms 2 in ammonia-spraying grid is 320mm, spacing d2 between multiple spray ammonia nozzles 1 in spray ammonia arm 2 is 320mm, and the staggered displacement being arranged in the spray ammonia nozzle 1 of adjacent spray ammonia arm 2 is 160mm.Through experimental verification, alternately arrange, spray that the front end of ammonia nozzle 1 has in the ammonia-spraying grid of band 60 ° of cone angle structures at spray ammonia nozzle 1, the mixture homogeneity of ammonia and flue gas obviously improves.
The present invention is illustrated by above-described embodiment, but should be understood that, above-described embodiment just for the object of illustrating and illustrate, and is not intended to the present invention to be limited in described scope of embodiments.In addition it will be appreciated by persons skilled in the art that the present invention is not limited to above-described embodiment, more kinds of variants and modifications can also be made according to instruction of the present invention, within these variants and modifications all drop on the present invention's scope required for protection.Protection scope of the present invention defined by the appended claims and equivalent scope thereof.
Claims (5)
1. the ammonia-spraying grid for low temperature SCR denitration system, described ammonia-spraying grid comprises the multiple spray ammonia arms arranged by spacing d1, described spray ammonia arm has the multiple spray ammonia nozzles by spacing d2 arrangement, it is characterized in that, the spray ammonia designs of nozzles being arranged in adjacent spray ammonia arm is become interlaced arrangement.
2. method according to claim 1, it is characterized in that, described interlaced arrangement is as follows: for two adjacent described spray ammonia arms, on the spray ammonia nozzle of one of them the spray ammonia arm center line between two of another spray ammonia arm adjacent spray ammonia nozzles.
3. method according to claim 1, is characterized in that, the front end of described spray ammonia arm is the structure of band cone angle.
4. method according to claim 3, is characterized in that, described cone angle is 60 °.
5. method according to claim 1, is characterized in that, described spacing d1 is 320mm, and described spacing d2 is 320mm, and the staggered displacement of described interlaced arrangement is 160mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510904124.7A CN105311959A (en) | 2015-12-09 | 2015-12-09 | Ammonia spraying grid for low-temperature SCR denitrification system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510904124.7A CN105311959A (en) | 2015-12-09 | 2015-12-09 | Ammonia spraying grid for low-temperature SCR denitrification system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105311959A true CN105311959A (en) | 2016-02-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510904124.7A Pending CN105311959A (en) | 2015-12-09 | 2015-12-09 | Ammonia spraying grid for low-temperature SCR denitrification system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105311959A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106422771A (en) * | 2016-11-04 | 2017-02-22 | 中冶焦耐(大连)工程技术有限公司 | Ammonia spraying structural body |
| CN111389219A (en) * | 2020-03-27 | 2020-07-10 | 浙江浙能技术研究院有限公司 | Ammonia injection control method for start-stop stage of coal-fired boiler |
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|---|---|---|---|---|
| CN101601965A (en) * | 2009-07-24 | 2009-12-16 | 华电环保系统工程有限公司 | The ammonia-spraying grid device of SCR method denitrating flue gas, and SCR method flue-gas denitration process |
| CN201454414U (en) * | 2009-07-24 | 2010-05-12 | 华电环保系统工程有限公司 | Ammonia injection grille device for flue gas denitration adopting SCR method |
| JP2013002334A (en) * | 2011-06-15 | 2013-01-07 | Toyota Industries Corp | Exhaust gas after-treatment device |
| CN202909629U (en) * | 2012-10-24 | 2013-05-01 | 中国石油化工股份有限公司 | Reversed-injection ammonia injection element |
| CN202909643U (en) * | 2012-10-24 | 2013-05-01 | 中国石油化工股份有限公司 | Gas mixing element and gas mixing device comprising same |
| CN203208900U (en) * | 2013-04-26 | 2013-09-25 | 北京中电联环保工程有限公司 | Dynamic ammonia injection grid |
| CN104524972A (en) * | 2014-12-22 | 2015-04-22 | 上海电气电站环保工程有限公司 | Design method of ammonia nozzle of SCR denitration device |
| CN204746055U (en) * | 2015-06-09 | 2015-11-11 | 宁波连通设备制造有限公司 | Ammonia injection grid for denitrification facility |
-
2015
- 2015-12-09 CN CN201510904124.7A patent/CN105311959A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101601965A (en) * | 2009-07-24 | 2009-12-16 | 华电环保系统工程有限公司 | The ammonia-spraying grid device of SCR method denitrating flue gas, and SCR method flue-gas denitration process |
| CN201454414U (en) * | 2009-07-24 | 2010-05-12 | 华电环保系统工程有限公司 | Ammonia injection grille device for flue gas denitration adopting SCR method |
| JP2013002334A (en) * | 2011-06-15 | 2013-01-07 | Toyota Industries Corp | Exhaust gas after-treatment device |
| CN202909629U (en) * | 2012-10-24 | 2013-05-01 | 中国石油化工股份有限公司 | Reversed-injection ammonia injection element |
| CN202909643U (en) * | 2012-10-24 | 2013-05-01 | 中国石油化工股份有限公司 | Gas mixing element and gas mixing device comprising same |
| CN203208900U (en) * | 2013-04-26 | 2013-09-25 | 北京中电联环保工程有限公司 | Dynamic ammonia injection grid |
| CN104524972A (en) * | 2014-12-22 | 2015-04-22 | 上海电气电站环保工程有限公司 | Design method of ammonia nozzle of SCR denitration device |
| CN204746055U (en) * | 2015-06-09 | 2015-11-11 | 宁波连通设备制造有限公司 | Ammonia injection grid for denitrification facility |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106422771A (en) * | 2016-11-04 | 2017-02-22 | 中冶焦耐(大连)工程技术有限公司 | Ammonia spraying structural body |
| CN111389219A (en) * | 2020-03-27 | 2020-07-10 | 浙江浙能技术研究院有限公司 | Ammonia injection control method for start-stop stage of coal-fired boiler |
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| PB01 | Publication | ||
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Application publication date: 20160210 |