CN201949798U - Flue gas mixing device in front of selective catalytic reduction (SCR) inlet in selective non-catalytic reduction/selective catalytic reduction (SNCR/SCR) combined denitration system - Google Patents
Flue gas mixing device in front of selective catalytic reduction (SCR) inlet in selective non-catalytic reduction/selective catalytic reduction (SNCR/SCR) combined denitration system Download PDFInfo
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- CN201949798U CN201949798U CN2011200513451U CN201120051345U CN201949798U CN 201949798 U CN201949798 U CN 201949798U CN 2011200513451 U CN2011200513451 U CN 2011200513451U CN 201120051345 U CN201120051345 U CN 201120051345U CN 201949798 U CN201949798 U CN 201949798U
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Abstract
The utility model discloses a flue gas mixing device in front of a selective catalytic reduction (SCR) inlet in a selective non-catalytic reduction/selective catalytic reduction (SNCR/SCR) combined denitration system. A circular-arc plate diversion layer and a straight plate diversion layer are arranged in sequence from top to bottom in a flue; the circular-arc plate diversion layer consists of a front row of circular-arc diversion plates and a back row of circular-arc diversion plates which are arranged at certain intervals and intersect with one another one by one; the two rows of circular-arc diversion plates have reverse bent arc structures; the straight plate diversion layer consists of a front row of straight plate diversion plates and a back row of straight plate diversion plates; the front row of straight plates incline backwards; the back row of straight plates incline forwards; the front row of inclined straight plates and the back row of inclined straight plates intersect pairwise to form X-shaped diversion plates; and the X-shaped diversion plates are isolated by vertical clapboards to form a small-channel compartment which is through on the upper and lower parts. Flue gas stream passes through the circular-arc plate diversion layers and the straight plate diversion layers, and turbulent flow and segmented eddy current are mixed forcibly along the length direction of the cross section of the flue, so that a reducing agent from flue gas produced by a hearth SNCR system is fully mixed with nitrogen oxide, and the back section SCR denitration efficiency of the flue is greatly improved.
Description
Technical field
The utility model relates to before the SCR inlet in the SNCR/SCR of thermal power plant (SNCR: SNCR denitration, SCR: selective-catalytic-reduction denitrified) the combined denitration system flue gas and all loads in mixture and put, and belongs to filed of flue gas purification.
Technical background
Power-plant flue gas contains harmful substance sulfur oxide and nitrogen oxide, and for reaching innoxious discharging, flue gas must carry out desulfurization and denitration.At present, the desulfur technology of the flue gas of China is comparatively ripe, and the denitration treatment technology still is in the starting stage.Denitrating flue gas is usually with reducing agents such as ammonia, ammoniacal liquor or urea, wherein, is that reducing agent is directly sprayed into burner hearth with burner hearth as SNCR denitration (the calling SNCR in the following text) technology of reactor, reducing agent under 900～1150 ℃ high temperature rapidly thermal decomposition become NH
3, optionally with flue gas in NOX reaction generate N
2, CO
2, H
2Innocuous gas such as O.Because the reasons in structure of boiler itself, the injection of reducing agent mainly concentrates on boiler front wall and part side wall, and back wall does not almost have the injection of reducing agent exit point to be arranged, so NO
XRemoval efficiency is generally 30%～50%.For further improving denitrating flue gas efficient, method is to adopt SNCR/SCR combined denitration system preferably, promptly the flue gas of discharging from burner hearth is lowered the temperature through recuperation of heat, flue gas with economizer exit feeds selective-catalytic-reduction denitrified (being SCR) reactor at last, at low temperatures by the further catalytic denitration of catalyst, and aforementioned reducing agent of escaping from burner hearth reaction back together enters the SCR reactor with flue gas.But on follow-up flue section, reducing agent and nitrous oxides concentration skewness, reducing agent and nitrogen oxide can cause the reduction of denitrating flue gas efficient and the increase of amount of ammonia slip bigger along flue width distributional difference.In order to improve from the aerodynamic field of the next flue gas of burner hearth SNCR denitrating system, reducing agent, nitrogen oxide component are evenly distributed, need blender be installed at SCR reactor leading portion flue.Owing to divide the two-way flue from economizer, single the flue outside is with inboard, the reducing agent of upside and downside and nitrous oxides concentration all have than big-difference, need do large scale to the flue gas in the flue, strong flow-disturbing all mixes, but conventional independent SCR denitrating technique flue gas mixing arrangement all is at the uniform condition design of flue ammonia grid, can not satisfy the flue gas large span flow-disturbing and the strong mixed requirement of hybrid technique requirement.Need design strong flow-disturbing targetedly all loads in mixture and puts.
The utility model content
The purpose of this utility model is in the SNCR/SCR combined denitration system, reducing agent and nitrogen oxide problem pockety on the flue cross section of flue gas before the SCR inlet, providing the preceding flue gas of a kind of SCR inlet all to load in mixture puts, realization all mixes the large scale of flue gas, strong flow-disturbing, makes the NH in the SCR device inlet flue gas
3/ NO
XConcentration evenly distributes, to improve the SCR denitration efficiency.
The utility model flue gas all loads in mixture to put and comprises the flue that communicates up and down, is provided with one deck arc plate water conservancy diversion layer and the straight plate water conservancy diversion of one deck layer at least at least in the described flue from the bottom up successively; Described arc plate water conservancy diversion layer is made up of front and back two row's circular blast baffles, front and back two rows' circular blast baffles are all arranged at certain intervals and are crossed one another correspondingly, the curved arc face of two row's circular blast baffles is reverse curved arc respectively towards the and arranged on left and right sides of flue; Described straight plate water conservancy diversion layer is made up of the front and back straight plate shape deflector of two rows, and front-seat straight plate shape deflector recedes, and the back straight plate shape deflector of row turns forward, and crosses one another into X type deflector one by one in couples between the straight plate shape deflector of front and back two rows; Be separated by with vertical clapboard between described each X type deflector, form the passage aisle that communicates up and down.
The center angle of described two circular blast baffles that cross one another is 50-60 °.
In the described type deflector, two straight plate shape deflectors all are 30-40 ° of angle with the flue cross section.
Described arc plate water conservancy diversion layer is provided with 2～3 layers.
In SNCR/SCR combined denitration system, the utility model flue gas all load in mixture put be connected in after the economizer, before the SCR device.Flue gas flows to into this flue gas and all loads in mixture postpone, upwards successively by arc plate water conservancy diversion layer and straight plate water conservancy diversion layer, formation mixes by force along the strong flow-disturbing of large scale and the subregion eddy current of flue cross section, make the reducing agent and the nitrogen oxide that come from the burner hearth SNCR system flue gas fully mix, improved the efficient of denitration greatly.
Description of drawings
Fig. 1 is that the utility model flue gas all loads in mixture the perspective view of putting;
Fig. 2 is the A-A sectional structure chart of Fig. 1;
Fig. 3 is the B-B sectional structure chart of Fig. 1.
Among the figure, the 1-flue, the 1-1-chimney intake, 1-2-flue outlet, the front-seat circular blast baffle of 2-, 2 '-back row's circular blast baffle, the front-seat straight plate shape deflector of 3-, 3 '-the straight plate shape deflector of back row, the 4-vertical clapboard, a-straight plate shape deflector and flue cross section angle, the center angle of b-two circular blast baffles.
The specific embodiment
Below in conjunction with description of drawings the utility model example structure.
Fig. 1 represents that the utility model flue gas all loads in mixture the stereochemical structure of putting, and comprises the flue 1 that communicates up and down, and 1-1 is the import of flue 1, links to each other with the outlet of economizer, and 1-2 is the outlet of flue 1, links to each other with the SCR reactor inlet.Be provided with two-layer arc plate water conservancy diversion layer and the straight plate water conservancy diversion of one deck layer in the flue 1 from the bottom up successively.Wherein, arc plate water conservancy diversion layer is by front-seat arc deflector 2 and back row's circular blast baffle 2 ' form, circular arc type deflector in the same row is arranged at certain intervals, before circular arc type deflector 2 and back row's circular arc type deflector 2 ' between cross one another correspondingly, the curved arc of front-seat circular blast baffle 2 is towards the left side of flue 1, back row's circular blast baffle 2 ' curved arc towards the right side of flue 1, the two is reverse curved arc.Straight plate water conservancy diversion layer is made up of the front and back straight plate shape deflector of two rows, inclination is oblique backward for front-seat straight plate shape water conservancy diversion 3, back straight plate shape water conservancy diversion 3 ' forward inclinations of row are oblique, front and back two rows tilt and cross one another into X type deflector one by one in couples between the straight plate shape water conservancy diversion, and straight plate shape deflector and flue cross section angle a are 30-40 ° (ginseng Fig. 2).Be separated by with vertical clapboard 4 between each X type deflector, form the passage aisle that communicates up and down.This stream mixing arrangement that is mixed by force adopts carbon steel material to make.
In the arc plate water conservancy diversion layer shown in Figure 3, two circular blast baffles 2 and 2 that cross one another ' center angle b be 50～60 °.
The utility model operation principle: flue gas stream enters from flue entrance 1-1, elbow through the front portion enters flue 1, upwards pass through two-layer arc plate water conservancy diversion layer and the straight plate water conservancy diversion of one deck X type layer (also can be multilayer) successively, discharge originally all to load in mixture from flue outlet 1-2 at last and put, feeding SCR reactor is further catalytic-reduction denitrified.The circular blast baffle 2 that flue gas is distributed in arc plate water conservancy diversion layer process and 2 ' large scale are mixed flow-disturbing by force, make the reducing agent that has neither part nor lot in reaction that comes from burner hearth SNCR system produce in flue gas and have carried out strong mixing and diffusion.When flue gas rises to straight plate water conservancy diversion layer, flue is separated plate semi-finals row and is divided into several passage aisles, when flue gas passes through each passage, X type deflector in the passage makes flue gas form eddy flow, make the regional area flow field realize that flow-disturbing mixes by force, therefore at flue outlet 1-2 place, reducing agent and nitrogen oxide concentration of component basically identical has improved denitration efficiency in the follow-up SCR reactor greatly in the flue gas.
This flue gas all loads in mixture to put can realize that flue gas mixes and along the vortex mixed of short side direction, the NH of homogenizing SCR reactor inlet along flue long side direction large scale
3/ NO
XConcentration gradient reduces NH
3/ NO
XThe inhomogeneities that distributes is with NH
3And NO
XThe concentration Deviation Control below 5%.
Claims (4)
1.SNCR/SCR flue gas all loads in mixture and puts before the inlet of the SCR in the combined denitration system, comprises the flue that communicates up and down, it is characterized in that being provided with successively from the bottom up in the described flue one deck arc plate water conservancy diversion layer and the straight plate water conservancy diversion of one deck layer at least at least; Described arc plate water conservancy diversion layer is made up of front and back two row's circular blast baffles, front and back two rows' circular blast baffles are all arranged at certain intervals and are crossed one another correspondingly, the curved arc face of two row's circular blast baffles is reverse curved arc respectively towards the and arranged on left and right sides of flue; Described straight plate water conservancy diversion layer is made up of the front and back straight plate shape deflector of two rows, and front-seat straight plate shape deflector recedes, and the back straight plate shape deflector of row turns forward, and crosses one another into X type deflector one by one in couples between the straight plate shape deflector of front and back two rows; Be separated by with vertical clapboard between described each X type deflector, form the passage aisle that communicates up and down.
2. flue gas all loads in mixture and puts before the SCR inlet in the SNCR/SCR combined denitration according to claim 1 system, it is characterized in that center angle 50-60 ° of the described circular blast baffle that crosses one another.
3. flue gas all loads in mixture and puts before the SCR inlet in the SNCR/SCR combined denitration according to claim 1 and 2 system, it is characterized in that the cross section of each straight plate shape deflector and flue is 30-40 ° of angle in the described X type deflector.
4. flue gas all loads in mixture and puts before the SCR inlet in the SNCR/SCR combined denitration according to claim 3 system, it is characterized in that described arc plate water conservancy diversion layer is provided with 2～3 layers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200513451U CN201949798U (en) | 2011-03-01 | 2011-03-01 | Flue gas mixing device in front of selective catalytic reduction (SCR) inlet in selective non-catalytic reduction/selective catalytic reduction (SNCR/SCR) combined denitration system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200513451U CN201949798U (en) | 2011-03-01 | 2011-03-01 | Flue gas mixing device in front of selective catalytic reduction (SCR) inlet in selective non-catalytic reduction/selective catalytic reduction (SNCR/SCR) combined denitration system |
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|---|---|
| CN201949798U true CN201949798U (en) | 2011-08-31 |
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| CN2011200513451U Expired - Lifetime CN201949798U (en) | 2011-03-01 | 2011-03-01 | Flue gas mixing device in front of selective catalytic reduction (SCR) inlet in selective non-catalytic reduction/selective catalytic reduction (SNCR/SCR) combined denitration system |
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| EP2620208A1 (en) | 2012-01-25 | 2013-07-31 | Alstom Technology Ltd | Gas mixing arrangement |
| CN103768938A (en) * | 2013-12-05 | 2014-05-07 | 浙江大学 | Ammonia-flue gas uniformly mixing device |
| CN104826473A (en) * | 2015-04-30 | 2015-08-12 | 江门市同力环保科技有限公司 | Three-phase turbulent-flow cylinder multi-furnace sharing efficient desulfurization dust-removing apparatus |
| CN105056756A (en) * | 2015-07-17 | 2015-11-18 | 中国重型机械研究院股份公司 | Selective catalytic reduction (SCR) denitration stream turbulence device |
| CN105797583A (en) * | 2016-03-18 | 2016-07-27 | 东方电气集团东方锅炉股份有限公司 | Efficient denitration device with low ammonia escape |
| CN106345293A (en) * | 2016-11-03 | 2017-01-25 | 无锡华光新动力环保科技股份有限公司 | Fume turbulent flow device used in SCR denitrification system |
| CN106390717A (en) * | 2016-11-30 | 2017-02-15 | 东方电气集团东方锅炉股份有限公司 | Denitration flue for SCR and SNCR combined denitration |
| CN106731797A (en) * | 2016-12-24 | 2017-05-31 | 北京工业大学 | A kind of efficient SCR reactors of flaring entrance |
| CN107243265A (en) * | 2017-07-25 | 2017-10-13 | 天津阿奇森环保技术有限公司 | A kind of ammonia blender |
| CN107433130A (en) * | 2017-09-01 | 2017-12-05 | 北京晨晰环保工程有限公司 | A kind of SCR flue gas denitration reactors of deflector optimization |
| CN110772991A (en) * | 2019-11-18 | 2020-02-11 | 中冶京诚工程技术有限公司 | Flow guide device, gas mixing equipment and gas treatment system |
| CN111346507A (en) * | 2020-04-10 | 2020-06-30 | 西安西热锅炉环保工程有限公司 | Denitration inlet flue full-section flue gas mixer and method |
| CN111974216A (en) * | 2020-06-24 | 2020-11-24 | 华电电力科学研究院有限公司 | Mixing device for SCR flue gas denitration system |
| CN113351009A (en) * | 2020-03-06 | 2021-09-07 | 大唐环境产业集团股份有限公司 | SCR flue gas mixing arrangement and SCR flue gas deNOx systems |
| WO2021203788A1 (en) * | 2020-04-10 | 2021-10-14 | 西安热工研究院有限公司 | Flue partition mixer and method |
| CN114950087A (en) * | 2022-05-18 | 2022-08-30 | 西安西热锅炉环保工程有限公司 | SCR denitration control system and method for ultralow nitrogen oxide emission |
-
2011
- 2011-03-01 CN CN2011200513451U patent/CN201949798U/en not_active Expired - Lifetime
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| US10232328B2 (en) | 2012-01-25 | 2019-03-19 | General Electric Technology Gmbh | Gas mixing arrangement |
| CN103223310A (en) * | 2012-01-25 | 2013-07-31 | 阿尔斯通技术有限公司 | Gas mixing arrangement |
| CN103223310B (en) * | 2012-01-25 | 2016-01-06 | 阿尔斯通技术有限公司 | Gas mixer |
| EP2620208B1 (en) * | 2012-01-25 | 2017-01-04 | General Electric Technology GmbH | Gas mixing arrangement |
| EP2620208A1 (en) | 2012-01-25 | 2013-07-31 | Alstom Technology Ltd | Gas mixing arrangement |
| CN103768938A (en) * | 2013-12-05 | 2014-05-07 | 浙江大学 | Ammonia-flue gas uniformly mixing device |
| CN103768938B (en) * | 2013-12-05 | 2016-03-09 | 浙江大学 | The equal mixing device of a kind of ammonia-flue gas |
| CN104826473A (en) * | 2015-04-30 | 2015-08-12 | 江门市同力环保科技有限公司 | Three-phase turbulent-flow cylinder multi-furnace sharing efficient desulfurization dust-removing apparatus |
| CN105056756A (en) * | 2015-07-17 | 2015-11-18 | 中国重型机械研究院股份公司 | Selective catalytic reduction (SCR) denitration stream turbulence device |
| CN105797583A (en) * | 2016-03-18 | 2016-07-27 | 东方电气集团东方锅炉股份有限公司 | Efficient denitration device with low ammonia escape |
| CN106345293A (en) * | 2016-11-03 | 2017-01-25 | 无锡华光新动力环保科技股份有限公司 | Fume turbulent flow device used in SCR denitrification system |
| CN106390717A (en) * | 2016-11-30 | 2017-02-15 | 东方电气集团东方锅炉股份有限公司 | Denitration flue for SCR and SNCR combined denitration |
| CN106731797A (en) * | 2016-12-24 | 2017-05-31 | 北京工业大学 | A kind of efficient SCR reactors of flaring entrance |
| CN107243265A (en) * | 2017-07-25 | 2017-10-13 | 天津阿奇森环保技术有限公司 | A kind of ammonia blender |
| CN107433130A (en) * | 2017-09-01 | 2017-12-05 | 北京晨晰环保工程有限公司 | A kind of SCR flue gas denitration reactors of deflector optimization |
| CN110772991A (en) * | 2019-11-18 | 2020-02-11 | 中冶京诚工程技术有限公司 | Flow guide device, gas mixing equipment and gas treatment system |
| CN113351009A (en) * | 2020-03-06 | 2021-09-07 | 大唐环境产业集团股份有限公司 | SCR flue gas mixing arrangement and SCR flue gas deNOx systems |
| CN113351009B (en) * | 2020-03-06 | 2022-11-11 | 大唐环境产业集团股份有限公司 | SCR flue gas mixing arrangement and SCR flue gas deNOx systems |
| CN111346507A (en) * | 2020-04-10 | 2020-06-30 | 西安西热锅炉环保工程有限公司 | Denitration inlet flue full-section flue gas mixer and method |
| WO2021203788A1 (en) * | 2020-04-10 | 2021-10-14 | 西安热工研究院有限公司 | Flue partition mixer and method |
| CN111974216A (en) * | 2020-06-24 | 2020-11-24 | 华电电力科学研究院有限公司 | Mixing device for SCR flue gas denitration system |
| CN114950087A (en) * | 2022-05-18 | 2022-08-30 | 西安西热锅炉环保工程有限公司 | SCR denitration control system and method for ultralow nitrogen oxide emission |
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| GR01 | Patent grant | ||
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| CX01 | Expiry of patent term |
Granted publication date: 20110831 |