CN104096477B - A kind of static mixer for selective catalytic reduction flue gas denitration system - Google Patents
A kind of static mixer for selective catalytic reduction flue gas denitration system Download PDFInfo
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- CN104096477B CN104096477B CN201410328172.1A CN201410328172A CN104096477B CN 104096477 B CN104096477 B CN 104096477B CN 201410328172 A CN201410328172 A CN 201410328172A CN 104096477 B CN104096477 B CN 104096477B
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Abstract
The invention discloses a kind of static mixer for selective catalytic reduction flue gas denitration system, this static mixer is arranged in the flue of denitrating system, and comprise the identical mixed cell of multiple structure, wherein each mixed cell is spliced around same central point jointly by eight congruent right angle trigonometry plate structures, these eight right angle trigonometry plate structures are divided into four groups, wherein often organize two triangular structure of right angle comprising respectively and being adjoined one another by right-angle side, the hypotenuse then respectively by right angle trigonometry plate structure between adjacent each group connects each other completely; In addition, the central point difference corresponding position of each mixed cell is directly over the center of circle of each nozzle of flue ammonia-spraying grid.By the present invention, significantly can improve the mixability of ammonia and flue gas, improve the uniformity of ammonia nitrogen mol ratio, produce less voltage loss, realize short distance mixing, possess flow-disturbing successful, compact overall structure simultaneously, be convenient to the features such as processing and installation.
Description
Technical field
The invention belongs to coal-fired plant flue gas denitrification apparatus technical field, more specifically, relate to a kind of static mixer for SCR (SCR) flue gas denitrification system.
Background technology
Current China requires increasingly stringent to the emission control of coal fired power plant nitrogen oxide, SCR (SelectiveCatalyticReduction, SCR) denitrating flue gas method is a kind of efficient, ripe technology, the highest denitration efficiency can reach more than 90% at present, and thus at home and abroad power plant's nitrogen oxides pollution thing control field is used widely.
In SCR reaction system, ammonia/air mixing systems important component part wherein, ammonia nitrogen mol ratio directly has influence on denitration efficiency and the escaping of ammonia rate.If ammonia mixes uneven with NOx, then the ammonia of incomplete reaction is had directly to overflow reactor; NH
3with the SO in flue gas
3and H
2o reaction can form NH
4hSO
4, the corrosion of cold section of air preheater can be aggravated, cause air preheater seriously stifled ash.Resistance can be made when blocking serious to increase by 30% ~ 50%, very large impact is caused on the safety of unit, economical operation.
In the SCR denitration system of current power plant, main adopt be ammonia-spraying grid to perform mixed ammonia process, owing to being subject to space reactor restriction, gas and vapor permeation is apart from limited, and then it is uneven to cause ammonia to mix with flue gas.For this reason, prior art has been set up blender and has been mixed with flue gas to make ammonia.But further research shows, it is not good that traditional blender exists mixed effect, and voltage loss is bigger than normal, and the defect such as processed complex, be therefore necessary in the art to make it further to improve or improve.
Summary of the invention
For above defect or the Improvement requirement of prior art, the invention provides a kind of new type static mixer for selective catalytic reduction flue gas denitration system, wherein by studying the aspect such as structure and set-up mode thereof of its key component, the corresponding mixability significantly can improving ammonia and flue gas, improve the uniformity of ammonia nitrogen mol ratio, produce less voltage loss, realize short distance mixing, possesses flow-disturbing successful simultaneously, compact overall structure, be convenient to the features such as processing and installation, thus ammonia/flue gas the mixed use of SCR reaction system is particularly useful for.
For achieving the above object, according to the present invention, provide a kind of static mixer for selective catalytic reduction flue gas denitration system, this static mixer is arranged in the flue of denitrating system, and it is identical and along the horizontal mixed cell of flue cross-sectional direction, it is characterized in that to comprise multiple structure:
Each mixed cell is spliced around same central point jointly by eight congruent right angle trigonometry plate structures respectively, and performing splicing in the following manner: these eight right angle trigonometry plate structures are divided into four groups, wherein often organize and comprise two triangular structure of right angle respectively, and these two triangular structure of right angle are connected each other completely by respective right-angle side; Then, connect completely each other respectively by the hypotenuse of right angle trigonometry plate structure again between adjacent each group;
In addition, the described central point difference corresponding position of each mixed cell is directly over the center of circle of each nozzle of flue ammonia-spraying grid, in this way, when ammonia is after the nozzle of ammonia-spraying grid injects flue, hit the center of mixed cell and be separated into eight parts by the bottom land that right angle triangle structures to form is formed, then the hypotenuse flowing through triangular structure of right angle produces whirlpool, causes ammonia and flue gas to perform Homogeneous phase mixing greatly thus.
As further preferably, for above-mentioned static mixer, all right angle trigonometry plate structures are set to be less than 35% of flue cross section in the projected area summation of horizontal plane, to avoid causing excessive drop.
As further preferably, three limits of described right angle trigonometry plate structure are preferred each unequal.
As further preferably, described mixed cell is all welded on stainless steel tube, is then fixed on the sidewall of flue by this stainless steel tube.
As further preferably, the spacing between the nozzle of the central point distance ammonia-spraying grid of each mixed cell is preferably set to 0.3m ~ 1m.
In general, the above technical scheme conceived by the present invention compared with prior art, mainly possesses following technological merit:
1, by adopting multiple right angle trigonometry plate structure jointly splice mixed cell and study its connecting method, test shows that ammonia flow is through farthest mixing in now producing whirlpool and then cause gas to perform in the shortest distance, in addition this process flow-disturbing Be very effective, and step-down is less;
2, by setting the height etc. of other critical performance parameters as projected area, distance ammonia nozzle of above-mentioned static mixer, carry out checking by using hydrokinetics calculation software to show, mixing can be performed fast to per share ammonia, greatly improve mixing efficiency, realize the Homogeneous phase mixing between ammonia and flue gas;
3, according to new type static mixer compact conformation of the present invention, be convenient to processing and install, applicability is strong, possess simultaneously and effectively can reduce the feature such as the escaping of ammonia, raising nitric efficiency, be thus particularly useful for the ammonia/flue gas mixed use of existing all kinds of SCR denitration system.
Accompanying drawing explanation
Fig. 1 is the perspective view according to the mixed cell constructed by the preferred embodiment of the present invention;
Fig. 2 is front view when being installed on flue according to static mixer of the present invention;
Fig. 3 is by agent structure schematic diagram when being used for existing SCR flue gas denitrification system according to static mixer of the present invention for exemplary illustrated;
In all of the figs, identical Reference numeral is used for representing identical element or structure, wherein:
1-economizer 2-ammonia-spraying grid 3-static mixer 4-deflector 5-flow straightening grid 6-catalyst layer 31-mixed cell 32-right angle trigonometry plate structure 33-stainless steel tube
Detailed description of the invention
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.In addition, if below in described each embodiment of the present invention involved technical characteristic do not form conflict each other and just can mutually combine.
Fig. 3 is by agent structure schematic diagram when being used for existing SCR flue gas denitrification system according to static mixer of the present invention for exemplary illustrated.As shown in Figure 3, after high-temperature flue gas leaves economizer 1, turn to through 90 degree downwards along flue and enter horizontal segment, through the rectification of two groups of deflectors, be diverted to vertical section.Ammonia-spraying grid 2 (AIG) is arranged near the downstream of vertical flue, and above this ammonia-spraying grid 2, for example the position of 0.5m is provided with according to static mixer 3 of the present invention simultaneously.This static mixer 3 is made up of jointly the mixed cell that multiple structure is identical, and can as shown in Figure 2, to be welded on a stainless steel tube 33 and cross-sectional direction along flue is horizontal, and its quantity is identical with the nozzle quantity of ammonia-spraying grid, such as is 80.Ammonia, after AIG nozzle injects flue, beats the center at each mixed cell 31, and dilution ammonia, by rapid flow-disturbing, is taken by the flue gas volume from upstream and fully spreads simultaneously; And then continue to occur to turn to for twice through vertical flue top, pass downwardly through flow straightening grid 5.Abundant mixed ammonia and flue gas enter catalyst layer 6 and catalytic reduction reaction occur, and the neat stress after denitration flows to the air preheater in downstream.
Specifically describe according to new type static mixer of the present invention below with reference to Fig. 1.As shown in fig. 1, each mixed cell 31 is spliced around same central point jointly by eight congruent right angle trigonometry plate structures 32 also namely overlapped completely after laminating respectively, wherein three limits of each right angle trigonometry plate structure 32 are each unequal, and performing splicing in the following manner: these eight right angle trigonometry plate structures are divided into four groups, wherein often organize and comprise two triangular structure of right angle respectively, and these two triangular structure of right angle are connected each other completely by respective right-angle side; Then, connect completely each other respectively by the hypotenuse of right angle trigonometry plate structure again between adjacent each group.For the purpose of being convenient to further observe, it may be noted that in this Fig. 1 that a group of being in dead ahead is rendered as the structure be inwardly recessed, one group that is in dead astern then protrudes towards the direction of reader; These the four groups forms being all similar to double fins, and and between horizontal plane, for example can form the inclination angle of 35 ° ~ 45 °, concrete angle can adjust according to real gas flow velocity.
In addition, the central point difference corresponding position of each mixed cell 31 is directly over the center of circle of each nozzle of flue ammonia-spraying grid 2, in this way, when ammonia is after the nozzle of ammonia-spraying grid 2 injects flue, hit the center of mixed cell 31 and be separated into eight parts by the bottom land that right angle triangle structures to form is formed, then the hypotenuse flowing through triangular structure of right angle produces whirlpool, whirlpool causes gas farthest to mix in the shortest distance, the air-flow of mixed cell periphery interacts, and accelerates being uniformly distributed of ammonia.Sub-thread mixed airflow after flow-disturbing, in extremely short distance, is diffused into space widely, flow-disturbing Be very effective, and pressure drop is minimum.
More specifically, the hypotenuse of each right angle triangle is preferably set to 150mm ~ 400mm, the preferred 6mm of thickness, and jointly can determine according to the nozzle quantity of flue sectional area and ammonia-spraying grid.According to a preferred embodiment of the present invention, for above-mentioned static mixer, all right angle trigonometry plate structures are set to be less than 35% of flue cross section in the projected area summation of horizontal plane, to avoid causing excessive drop.
According to another preferred embodiment of the present invention, the nozzle of the central point distance ammonia-spraying grid of each mixed cell is set to the spacing of 0.3m ~ 1m.Shown by the checking of hydrokinetics calculation software simulation, above-mentioned running parameter can realize mixing fast per share ammonia in short distance, effectively improves mixing efficiency, and enhances flow-disturbing interference, finally guarantees the homogeneous reaction between ammonia and flue gas.
In addition, determined by flue cross section according to the quantity of mixed cell of the present invention, arrangement mode can be determined according to the nozzle of supporting ammonia-spraying grid, as long as guarantee that the central point of mixed cell is positioned at directly over the center of circle of nozzle.
By using method for numerical simulation to verify actual effect of the present invention, as calculated, before SCR reactor first floor catalyst, VELOCITY DISTRIBUTION deviation can reach 8.7%.In addition, before not adding blender, the concentration deviation of ammonia nitrogen mol ratio is 7.5%, after installing this blender additional, deviate is 4.3%, and the SR of generation is 72pa, meet engineering design target, above-mentioned actual test result indicates static mixer of the present invention and possesses larger using value.
Those skilled in the art will readily understand; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. for a static mixer for selective catalytic reduction flue gas denitration system, this static mixer is arranged in the flue of denitrating system, and it is identical and along the horizontal mixed cell of flue cross-sectional direction, it is characterized in that to comprise multiple structure:
Each mixed cell is spliced around same central point jointly by eight congruent right angle trigonometry plate structures respectively, and performing splicing in the following manner: these eight right angle trigonometry plate structures are divided into four groups, wherein often organize and comprise two triangular structure of right angle respectively, and these two triangular structure of right angle are connected each other completely by respective right-angle side; Then, connect completely each other respectively by the hypotenuse of right angle trigonometry plate structure again between adjacent each group;
In addition, the described central point difference corresponding position of each mixed cell is directly over the center of circle of each nozzle of flue ammonia-spraying grid, in this way, when ammonia is after the nozzle of ammonia-spraying grid injects flue, hit the center of mixed cell and be separated into eight parts by the bottom land that right angle triangle structures to form is formed, then the hypotenuse flowing through triangular structure of right angle produces whirlpool, causes ammonia and flue gas to perform Homogeneous phase mixing greatly thus.
2. static mixer as claimed in claim 1, it is characterized in that, all right angle trigonometry plate structures are set to be less than 35% of flue cross section in the projected area summation of horizontal plane, to avoid causing excessive drop.
3. static mixer as claimed in claim 1 or 2, it is characterized in that, three limits of described right angle triangle are each unequal.
4. static mixer as claimed in claim 3, is characterized in that, the central point of each mixed cell apart from described flue ammonia-spraying grid nozzle between spacing be set to 0.3m ~ 1m.
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| CN104689735B (en) * | 2015-03-19 | 2016-08-31 | 西安西热锅炉环保工程有限公司 | A kind of integral type ammonia injector mixer being applicable to chimney flue type Benitration reactor |
| CN107081058B (en) * | 2017-05-09 | 2019-11-12 | 成都融科能源环境工程有限公司 | A kind of efficient hybrid system facilitating denitration mixing |
| CN108722186B (en) * | 2018-08-09 | 2024-03-08 | 国电环境保护研究院有限公司 | Array type nozzle device |
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| US5580171A (en) * | 1995-07-24 | 1996-12-03 | Lim; John C. | Solids mixing, storing and conveying system for use with a furnace for single crystal silicon production |
| CN1683063A (en) * | 2004-02-27 | 2005-10-19 | 赫多特普索化工设备公司 | Apparatus for mixing of fluid streams |
| CN1806903A (en) * | 2005-01-17 | 2006-07-26 | 巴尔克有限公司 | Admixer and mixing method |
| CN102389727A (en) * | 2011-10-13 | 2012-03-28 | 东南大学 | SCR (Selective Catalytic Reduction) denitration four-corner tangent circle type ammonia-fume gas uniformly-mixing device |
| CN102430335A (en) * | 2011-09-14 | 2012-05-02 | 无锡华光新动力环保科技股份有限公司 | Mixing structure of flue gas denitration device |
| CN103585908A (en) * | 2013-11-20 | 2014-02-19 | 哈尔滨工程大学 | Multistage guide vane static mixer |
-
2014
- 2014-07-09 CN CN201410328172.1A patent/CN104096477B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5580171A (en) * | 1995-07-24 | 1996-12-03 | Lim; John C. | Solids mixing, storing and conveying system for use with a furnace for single crystal silicon production |
| CN1683063A (en) * | 2004-02-27 | 2005-10-19 | 赫多特普索化工设备公司 | Apparatus for mixing of fluid streams |
| CN1806903A (en) * | 2005-01-17 | 2006-07-26 | 巴尔克有限公司 | Admixer and mixing method |
| CN102430335A (en) * | 2011-09-14 | 2012-05-02 | 无锡华光新动力环保科技股份有限公司 | Mixing structure of flue gas denitration device |
| CN102389727A (en) * | 2011-10-13 | 2012-03-28 | 东南大学 | SCR (Selective Catalytic Reduction) denitration four-corner tangent circle type ammonia-fume gas uniformly-mixing device |
| CN103585908A (en) * | 2013-11-20 | 2014-02-19 | 哈尔滨工程大学 | Multistage guide vane static mixer |
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