CN101450293B - Fin type blunt body static mixing device - Google Patents
Fin type blunt body static mixing device Download PDFInfo
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- CN101450293B CN101450293B CN2008102364011A CN200810236401A CN101450293B CN 101450293 B CN101450293 B CN 101450293B CN 2008102364011 A CN2008102364011 A CN 2008102364011A CN 200810236401 A CN200810236401 A CN 200810236401A CN 101450293 B CN101450293 B CN 101450293B
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- bluff body
- flue
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- mixing device
- static mixing
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Abstract
The invention relates to a fin type blunt body static mixing device. A group of horizontal triangular blunt bodies are arranged in the vertical direction of a horizontal flue; the tip ends of each triangular blunt body meet the fume flow in the horizontal flue; a plurality of rectangular fins which have the same deflection direction and have the deflection angle of 20 to 70 degrees from the flowing direction of the fume flow are evenly arranged on the upper and lower sides of each triangular blunt body; and the rectangular fins on each two adjacent triangular blunt bodies have the opposite deflection directions and are arranged alternately. The fume is accelerated in a free passage formed by each two adjacent triangular blunt bodies. As the rectangular fins on each two adjacent triangularblunt bodies have the opposite deflection directions, namely, one is deflected left and the other is deflected right, the multiple cross flow of the fume is produced under the action of the two fins.Therefore, the fume flow is mixed fiercely and produces a numerous small vortex zones on the down stream of the triangular blunt bodies. The ammonia gas and the fume are mixed quickly and intensivelyand the vortex tends to be calmed down in a very short distance so as to form an even flow field, even NH3NOx mol ratio distribution, even fly ash concentration distribution and an even temperature.
Description
Technical field
The present invention relates to a kind of in coal-burning boiler high-temperature high dust type flue gas denitrification system key technology, promptly flue gas and ammonia are carried out well-mixed static mixing device, be specifically related to a kind of fin type blunt body static mixing device in the ammonia-gas spraying device downstream of flue gas denitrification system.
Background technology
In flue gas denitrification system, static mixing device is one of key equipment, it is positioned at the ammonia-gas spraying device downstream, although this also possesses certain mixed function ammonia-gas spraying device in the time of spray ammonia, but reach mixed uniformly stroke in order to shorten ammonia/flue gas, the real mixing of ammonia/flue gas need rely on static mixing device and realize, spreads and realizes and can not rely on gas/gas, because the physics stroke that this process need is very long does not allow in engineering practice.
The quality of static mixing device performance will play material impact to the degree of mixing of ammonia/flue gas, also be simultaneously the significant points of build-up of pressure loss, and then have influence on economic indexs such as denitration efficiency, the escaping of ammonia and air-introduced machine power consumption.The static mixing device that is installed on the ammonia-gas spraying device downstream at present mainly contains three classes.
The first kind is the static mixing device that is made of numerous collapsible turbulent elements, and the ammonia nozzle quantity of the quantity of collapsible turbulent element and upstream is suitable.These collapsible turbulent elements are welded on the support in the flue, cover whole flue cross section, when flowing through herein, passes through the flue gas that is sprayed with ammonia by irregular path, produce eddy current at the turbulent element dorsal part, the flow field multilated, this process makes ammonia and flue gas be uniformly mixed, and whole afterwards air-flow is restoring calm in the equipment flow process downstream gradually.This class static mixing device can reach satisfied mixed effect in short distance when the turbulent element arrangement is closeer, but the flue gas resistance that causes loss is bigger, will directly increase the power consumption of air-introduced machine.
Second class is simple flow-disturbing pipe, promptly manage in ammonia-gas spraying device arranged downstream one row garden, when flowing through herein, the flue gas that is sprayed with ammonia is subjected to the obstruction of row's flow-disturbing pipe, flue gas is along flow-disturbing pipe both sides flow further downstream, produce eddy current at flow-disturbing pipe dorsal part, this process makes that ammonia and flue gas obtain mixing, and this class static mixing device is simple in structure, the flue gas resistance loss is less, but mixed effect is undesirable.
The 3rd class is a vortex mixer, its principle is to make flue gas produce vortex by the element (as tilted-putted triangle, garden shape, oblong surface) of placing suitable shape in flue, ammonia is injected into vortex region, utilizes the effect of vortex, realization ammonia fully mixes with flue gas.Only adopt a spot of element on whole flue cross section, be generally 2 to 10, the relative size of each element is bigger, and it is also bigger that element produces vortex, and the mixing distance of requirement is longer, and is bigger to the destructiveness in whole flow field.
Summary of the invention
The objective of the invention is to overcome the shortcoming of above-mentioned prior art, provide a kind of structure simple relatively, by multiple cross flow one and local little eddy current realize ammonia/flue gas rapid mixing, little to whole flow field destructiveness, at very the short distance flow field restores calm, resistance is low fin type blunt body static mixing device.
For achieving the above object, the technical solution used in the present invention is: be furnished with one group of triangle bluff body of laterally placing in the vertical direction that is positioned at ammonia-gas spraying device downstream horizontal flue, the meet water flue gas stream of flat flue of triangle bluff body tip, the upper and lower faces of triangle bluff body evenly is furnished with several rectangle fins, the flow direction deflection angle of this rectangle fin and flue gas stream is 20-70 °, the yawing moment of the rectangle fin of same triangle bluff body upper and lower faces is identical, and the yawing moment of the rectangle fin on the adjacent triangle bluff body is arranged on the contrary and alternately.
The length of triangle bluff body of the present invention is identical with the width of horizontal flue; The quantity of triangle bluff body is 2-30; The quantity of the rectangle fin on each face of triangle bluff body is 6-100; Be the flue gas clear passage between the adjacent two triangle bluff body, the clear passage gross area is no less than 40% of whole flue sectional area.
When in the upstream equipment ammonia-gas spraying device, being sprayed with the flue gas arrival fin type blunt body static mixing device of ammonia, having the clear passage place that constitutes between the triangle bluff body of rectangle fin adjacent two is accelerated, because the yawing moment of the rectangle fin on the adjacent two triangle bluff body is arranged on the contrary and alternately, the i.e. effect of the fin of a left avertence and a right avertence produces multiple cross flow one down, fierce mixing takes place in air-flow, produce countless little vortexes in triangle bluff body downstream, ammonia obtains mixing fully fast with flue gas, eddy current is tending towards tranquil gradually in very short distance, reach good conditions, promptly uniform flow field, uniform NH
3The distribution of/NOx mol ratio, uniform flying dust CONCENTRATION DISTRIBUTION, even temperature.
Description of drawings
Fig. 1 is an overall structure schematic diagram of the present invention;
Fig. 2 is the view of the present invention along the flow of flue gas direction.
The specific embodiment
Below in conjunction with accompanying drawing structural principle of the present invention and operation principle are described in further detail.
Referring to Fig. 1, the present invention includes the vertical direction that is positioned at ammonia-gas spraying device downstream horizontal flue 1 and be furnished with one group of identical triangle bluff body 3 of the width with horizontal flue 1 of laterally placing, the quantity of triangle bluff body is 2-30, the meet water flue gas stream 2 of flat flue of triangle bluff body 3 tips, on the triangle bluff body 3, following two sides evenly is furnished with 6-100 rectangle fin 4, this rectangle fin 4 is 20-70 ° with the flow direction deflection angle of flue gas stream 2, on the same triangle bluff body 3, the yawing moment of the rectangle fin 4 on following two sides is identical, opposite (the i.e. left avertence of the yawing moment of the rectangle fin 4 on the adjacent triangle bluff body 3, a right avertence) and alternately arrange, be the flue gas clear passage between the adjacent two triangle bluff body 3, the clear passage gross area is no less than 40% of whole flue sectional area.
Referring to Fig. 2, the inlet of horizontal flue 1 is connected with the exhaust pass of ammonia-gas spraying device, the flue gas stream 2 that enters the horizontal flue inlet has been sprayed into a certain amount of ammonia in the ammonia-gas spraying device of upstream, the amount of ammonia depends on the concentration of the NOx that contains in the flue gas, but it is extremely micro-with respect to flue gas flow, the Benitration reactor that is positioned at downstream of the present invention requires this extremely micro-ammonia fully to mix with flue gas, to improve denitration efficiency, reduces the amount of ammonia slip of denitrating system end.In horizontal flue 1, be provided with the triangle bluff body 3 of rectangle fin 4 of one group of band deflection to the right and the rectangle fin 4 triangle bluff bodies 3 of deflection left for this reason, on the short transverse of flue, arrange alternately that with uniform interval right avertence fin triangle bluff body 3 and left avertence fin triangle bluff body 3 first is that right avertence fin triangle bluff body or left avertence fin triangle bluff body all can.Facing the clear passage place that forms between two triangle bluff bodies mutually, right avertence fin and left avertence fin (otherwise or) are arranged respectively up and down, the flue gas 5 of right avertence fin and the flue gas 6 of left avertence fin by the time form cross-current, simultaneously because the existence that triangle is opened bluff body 3, flow velocity is accelerated herein, downstream at triangle bluff body 3, the flue gas of cross flow one inspires a large amount of little eddy current, strengthened the mixed process of ammonia and flue gas, shorten the desired distance of even mixing, satisfied the steric requirements of site of deployment easily.Owing in this mixed process, be mainly concerned with intersection and a large amount of little eddy current of local flow field, uniformity to whole flow field when finishing mixing is destroyed little, return to uniform flow field soon, be very beneficial for the operation of the Benitration reactor in downstream, this process has determined that also the drag losses of mixed process is less simultaneously, helps reducing the power consumption of air-introduced machine.
In the use horizontal flue 1 inlet of the present invention is connected with the flue of ammonia-gas spraying device outlet, the outlet of horizontal flue 1 links to each other with Zag flue flow equalizing apparatus, is communicated with Benitration reactor afterwards.Its basic functional principle is: from the flue gas of economizer by behind the ammonia-gas spraying device, when entering apparatus of the present invention, extremely Wei Liang ammonia obtains fully to mix fast with flue gas, pass through Zag flue flow equalizing apparatus afterwards, flue gas is transferred to vertically downward from horizontal direction to flow, enter flue gas denitration reactor, nitrogen oxide in the flue gas under the effect of catalyst in reactor with ammonia generation reduction reaction, generate harmless water and nitrogen, realize the purpose of denitrating flue gas, the flue gas that Benitration reactor comes out enters the upstream device air preheater of whole denitrating system.
Claims (5)
1. fin type blunt body static mixing device, it is characterized in that: be furnished with one group of triangle bluff body (3) of laterally placing in the vertical direction that is positioned at ammonia-gas spraying device downstream horizontal flue (1), the meet water flue gas stream (2) of flat flue of triangle bluff body (3) tip, on the triangle bluff body (3), following two sides evenly is furnished with several rectangle fins (4), this rectangle fin (4) is 20-70 ° with the flow direction deflection angle of flue gas stream (2), on the same triangle bluff body (3), the yawing moment of the rectangle fin (4) on following two sides is identical, and the yawing moment of the rectangle fin (4) on the adjacent triangle bluff body (3) is arranged on the contrary and alternately.
2. fin type blunt body static mixing device according to claim 1 is characterized in that: the length of said triangle bluff body (3) is identical with the width of horizontal flue (1).
3. fin type blunt body static mixing device according to claim 1 is characterized in that: the quantity of said triangle bluff body (3) is 2-30.
4. fin type blunt body static mixing device according to claim 1 is characterized in that: the quantity of the rectangle fin (4) on each face of said triangle bluff body (3) is 6-100.
5. fin type blunt body static mixing device according to claim 1 is characterized in that: be the flue gas clear passage between the said adjacent two triangle bluff body (3), the clear passage gross area is no less than 40% of whole flue sectional area.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102364011A CN101450293B (en) | 2008-12-22 | 2008-12-22 | Fin type blunt body static mixing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102364011A CN101450293B (en) | 2008-12-22 | 2008-12-22 | Fin type blunt body static mixing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101450293A CN101450293A (en) | 2009-06-10 |
| CN101450293B true CN101450293B (en) | 2010-11-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008102364011A Expired - Fee Related CN101450293B (en) | 2008-12-22 | 2008-12-22 | Fin type blunt body static mixing device |
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| CN (1) | CN101450293B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102444453A (en) * | 2011-12-14 | 2012-05-09 | 杭州银轮科技有限公司 | Static mixer for exhaust system |
| CN102444451A (en) * | 2011-12-14 | 2012-05-09 | 杭州银轮科技有限公司 | Static mixer for after-treatment system of diesel engine |
| CN103007701B (en) * | 2012-10-16 | 2015-05-27 | 西安热工研究院有限公司 | Petal ammonia injection grid for combining local vortex and overall vortex |
| CN106390717B (en) * | 2016-11-30 | 2023-05-23 | 东方电气集团东方锅炉股份有限公司 | Denitration flue for combined denitration of SCR and SNCR |
| KR101912305B1 (en) * | 2018-08-22 | 2018-12-28 | 주식회사 유성엔지니어링 | apparatus for removing bad smell by liquid medicine with two steps |
| CN113028434A (en) * | 2021-03-08 | 2021-06-25 | 中国大唐集团科学技术研究院有限公司华中电力试验研究院 | Coal fired boiler flying dust discrete denitration flue |
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| CN101450293A (en) | 2009-06-10 |
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Owner name: XI AN XIRE BOILER ENVIRONMENTAL PROT ENGINEERING C Free format text: FORMER OWNER: XI AN THERMAL POWER RESEARCH INSTITUTE CO., LTD. Effective date: 20130805 |
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Effective date of registration: 20130805 Address after: 710032 Xingqing Road, Shaanxi, China, No. 136, No. Patentee after: Xi'an Xire Boiler Environmental Protection Engineering Co., Ltd. Address before: 710032 Xingqing Road, Shaanxi, China, No. 136, No. Patentee before: Xi'an Thermal Power Research Institute Co., Ltd. |
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