CN103055734A - SCR (Selective Catalytic Reduction) static mixer of semi-flexible willow-leaf-shaped blade - Google Patents
SCR (Selective Catalytic Reduction) static mixer of semi-flexible willow-leaf-shaped blade Download PDFInfo
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- CN103055734A CN103055734A CN2013100021431A CN201310002143A CN103055734A CN 103055734 A CN103055734 A CN 103055734A CN 2013100021431 A CN2013100021431 A CN 2013100021431A CN 201310002143 A CN201310002143 A CN 201310002143A CN 103055734 A CN103055734 A CN 103055734A
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Abstract
The invention discloses an SCR (Selective Catalytic Reduction) static mixer of a semi-flexible willow-leaf-shaped blade. A row of steel tube grids are welded between two sides along two short edges of a steel-made shell of which the cross section is rectangular; a plurality of steel tube grids are arranged at equal intervals in one row from top to bottom; semi-flexible willow-twig-shaped blade grids of the same structure are welded at equal intervals on the steel tube grids; the steel tube grids in an odd number row and the semi-flexible willow-twig-shaped blade grids on the steel tube grids in an even number row are arranged in a staggered manner for 1/2 of the blade grid pitch. According to the SCR static mixer, the turbulivity of fluid inside a flue is enhanced by utilizing the complex arrangement of the willow-leaf-like blades and a flow field chaos effect caused by weak vibration as the fluid blows the blades in the flowing process, so that the mixing process of fume and ammonia is enhanced, the tail ammonia escape rate is effectively reduced, the deploy depth of mixer assemblies is reduced, and meanwhile the denitration efficiency is improved, and moreover the problem that a power plant which is put into operation is often inadequate in space and field when SCR technique transformation is performed is solved.
Description
Technical field
The present invention relates to a kind of static mixer, especially relate to a kind of half flexible willow leaf type blade SCR static mixer.
Background technology
The size of selective-catalytic-reduction denitrified technique (SCR) reactor that is complementary with the large electric power plant unit is usually all very large, cause VELOCITY DISTRIBUTION, the reactant concentration skewness of its inducer, when denitration efficiency requires 90% when above, the escaping of ammonia rate will increase rapidly, and this direct impact on the SCR upstream device is sizable.Present technology often adopts the flue inner assemblies such as deflector, ammonia-spraying grid (AIG), static mixer to improve uniformity and the NH of catalyst layer flow of flue gas
3/ NO
XBetween mixability, wherein the static mixing technology is a kind of effective method.But commercial static mixer mostly is foreign technology at present, expensive, follow-up investment is very large, and mixed effect reaches far away idealized degree, cause the arrangement of components degree of depth larger, taken than large space, this not only causes investment to increase, and concerning the power plant that has put into operation carries out follow-up SCR technological transformation, often be difficult to bear.The present invention is for overcoming the above problems, intend a kind of half flexible willow leaf type blade SCR static mixer based on the bionics theory of research and development, the flow field chaos effect of utilizing imitative willow leaf type blade complex array and weak vibration to produce strengthens the mixed effect of flue gas and ammonia, fully reducing the depth of placement of assembly, thereby adapt to the difficulty that the old SCR of power plant carries out the lack of space that house of correction runs into.Can obviously improve simultaneously the denitration efficiency of SCR system, reduce afterbody the escaping of ammonia rate, to obtain higher economic benefit and to solve the difficult problem of environmental protection.
Summary of the invention
The object of the present invention is to provide a kind of chaos effect of utilizing half flexible willow leaf type blade to produce to strengthen half flexible willow leaf type blade SCR static mixer of mixed effect.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is:
The present invention is that rectangular steel shell is along between two minor face both sides in the cross section, be welded with row's steel pipe grizzly bar, and a row all has the steel pipe grizzly bar of many equidistant placement from top to bottom, equidistantly be welded with the half identical dendritic leaf grating of flexible willow of structure on the steel pipe grizzly bar, 1/2nd pitch of cascades that stagger of the half dendritic leaf grating of flexible willow on odd number row's steel pipe grizzly bar and the even rows steel pipe grizzly bar are arranged.
The imitative willow leaf type blade that the blade root that the described half dendritic leaf grating of flexible willow is made by fine steel rib and the sheet metal of anticorrosive anti-wear are made consists of, the blade root that fine steel rib is made is welded on the steel pipe grizzly bar, the imitative willow leaf type blade that sheet metal is made is welded on the blade root that fine steel rib makes, and each half dendritic leaf grating of flexible willow is towards identical.
The beneficial effect that the present invention has is:
Adopting half flexible willow leaf type blade SCR static mixer is to utilize in imitative willow leaf type blade complex array and the process fluid flow weak vibration that the purging to blade produces and the flow field chaos effect that produces strengthens the turbulivity of flue inner fluid, because the greatly enhancing of turbulivity, therefore compare with the static mixer of routine, the mixed process of flue gas and ammonia is strengthened, thereby can effectively reduce afterbody the escaping of ammonia rate, reduce the depth of placement of mixer assembly, simultaneously can obviously improve the denitration efficiency of SCR system, and overcome the power plant that puts into operation and carry out space that the SCR technological transformation runs into often and the problem of lack of space.In addition, because semiflexible cascade structure design so that leaf grating produces vibration to a certain degree in by the fluid purge, not only can further be strengthened turbulence effect, can also destroy simultaneously the homeostasis process of leaf grating dust stratification process, greatly reduce the dust stratification degree of blade.
Description of drawings
Fig. 1 is front view of the present invention.
Fig. 2 is top view of the present invention.
Fig. 3 is side view of the present invention.
Among the figure: 1, steel shell, 2, the steel pipe grizzly bar, 3, the half dendritic leaf grating of flexible willow, 3.1, imitative willow leaf type blade, 3.2, blade root.
The specific embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail.
Such as Fig. 1, Fig. 2, shown in Figure 3, the present invention is that rectangular steel shell 1 is along between two minor face both sides in the cross section, be welded with row's steel pipe grizzly bar 2, and a row all has the steel pipe grizzly bar of many (the present invention is five) equidistant placement from top to bottom, equidistantly be welded with the half identical dendritic leaf grating 3 of flexible willow of structure on the steel pipe grizzly bar, 1/2nd pitch of cascades that stagger of the half dendritic leaf grating of flexible willow on odd number row's steel pipe grizzly bar and the even rows steel pipe grizzly bar are arranged.
The imitative willow leaf type blade 3.1 that the blade root 3.2 that the described half dendritic leaf grating 3 of flexible willow is made by fine steel rib and the sheet metal of anticorrosive anti-wear are made consists of, the blade root 3.2 that fine steel rib is made is welded on the steel pipe grizzly bar 2, the imitative willow leaf type blade 3.1 that sheet metal is made is welded on the blade root 3.2 that fine steel rib makes, and each half dendritic leaf grating of flexible willow is towards identical.
In order to increase the degree of filling in 3 pairs of flue cross sections of the dendritic leaf grating of willow, the odd number row's steel pipe grizzly bar 2 on the flue cross section and even rows steel pipe grizzly bar 2 1/2nd pitch of cascades that stagger are arranged.Adopting half flexible willow leaf type blade SCR static mixer is to utilize in imitative willow leaf type blade complex array and the process fluid flow weak vibration that the purging to blade produces and the flow field chaos effect that produces strengthens the turbulivity of flue inner fluid, because the greatly enhancing of turbulivity, therefore compare with the static mixer of routine, strengthened the mixed effect of flue gas and ammonia, thereby can effectively reduce afterbody the escaping of ammonia rate, reduce the depth of placement of mixer assembly, simultaneously can obviously improve the denitration efficiency of SCR system, and overcome the power plant that puts into operation and carry out space that the SCR technological transformation runs into often and the problem of lack of space.In addition, because semiflexible cascade structure design is so that the vibration to a certain degree that leaf grating produces in by the fluid purge not only can be strengthened turbulence effect, can also destroy simultaneously the homeostasis process of leaf grating dust stratification process, greatly reduce the dust stratification degree of blade.
Situation is as follows during half flexible willow leaf type blade SCR static mixer real work of the present invention:
In the reactor of SCR system, filled honeycombed catalyst, make the maximum usefulness of these catalyst performances, must make the ammonia concentration in the flue gas that enters each catalyst endoporus approximate identical, this just need to make the ammonia that sprays into flue mix to greatest extent with flue gas as early as possible in the flue of Reactor inlet.Generally, this needs a very long segment distance, namely is to say, spray ammonia point must guarantee one section long distance apart from reactor inlet, this is more implacable on the Late reformation engineering particularly on engineering, and solution to this problem is installed static mixer exactly.Half flexible willow leaf type blade SCR static mixer of the present invention in the premix flue along the layout of cross-wise direction, odd number row steel pipe grizzly bar 2 and even rows steel pipe grizzly bar 2 1/2nd pitch of cascades that stagger are arranged, being oriented along flue gas flow direction of the dendritic leaf grating 3 of willow, can arrange a row or multi-rowly in the flow of flue gas direction, concrete row designs after considering according to combined factors such as unit size, ammonia spraying amount, flow resistance and denitration indexs.After the smoke gas flow, because the existence of the dendritic leaf grating 3 of willow, so that air-flow produces very strong turbulence effect, simultaneously in the process of streaming imitative willow leaf type blade 3.1, because the impact of air-flow can cause the slight vibration of the dendritic leaf grating 3 of willow, further strengthened turbulence effect, this is just so that ammonia and flue gas under strong turbulence, carry out rapidly the exchange of momentum and energy, thereby strengthened heat and mass transfer process, so that mixed effect is strengthened.In addition, the vibration of the dendritic leaf grating 3 of willow not only can be strengthened turbulence effect, can also destroy the homeostasis process of the dendritic leaf grating 3 dust stratification processes of willow simultaneously, has greatly reduced the dust stratification degree of imitative willow leaf type blade.
At last, it is also to be noted that what more than enumerate only is a specific embodiment of the present invention.The above-mentioned specific embodiment is used for the present invention that explains, rather than limits the invention, and in the protection domain of spirit of the present invention and claim, any modification and change to the present invention makes all fall into protection scope of the present invention.
Claims (2)
1. one and half flexible willow leaf type blade SCR static mixers, it is characterized in that: be that rectangular steel shell is along between two minor face both sides in the cross section, be welded with row's steel pipe grizzly bar, and a row all has the steel pipe grizzly bar of many equidistant placement from top to bottom, equidistantly be welded with the half identical dendritic leaf grating of flexible willow of structure on the steel pipe grizzly bar, 1/2nd pitch of cascades that stagger of the half dendritic leaf grating of flexible willow on odd number row's steel pipe grizzly bar and the even rows steel pipe grizzly bar are arranged.
2. a kind of imitative pine needle shape blade SCR static mixer according to claim 1, it is characterized in that: the imitative willow leaf type blade that the blade root that the described half dendritic leaf grating of flexible willow is made by fine steel rib and the sheet metal of anticorrosive anti-wear are made consists of, the blade root that fine steel rib is made is welded on the steel pipe grizzly bar, the imitative willow leaf type blade that sheet metal is made is welded on the blade root that fine steel rib makes, and each half dendritic leaf grating of flexible willow is towards identical.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013100021431A CN103055734A (en) | 2013-01-05 | 2013-01-05 | SCR (Selective Catalytic Reduction) static mixer of semi-flexible willow-leaf-shaped blade |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013100021431A CN103055734A (en) | 2013-01-05 | 2013-01-05 | SCR (Selective Catalytic Reduction) static mixer of semi-flexible willow-leaf-shaped blade |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105126684A (en) * | 2015-08-05 | 2015-12-09 | 沈阳理工大学 | Micro mixer with end surface phyllotaxy assignment structure |
| CN105597584A (en) * | 2016-03-11 | 2016-05-25 | 济南正骐生物科技有限公司 | Static mixer |
| CN110469864A (en) * | 2019-08-08 | 2019-11-19 | 湖南大唐节能科技有限公司 | A kind of SCR subregion spray ammonia optimal control method of the preposition static mixer of band |
| CN112387090A (en) * | 2020-10-30 | 2021-02-23 | 张飞 | Electric arc formula SOx/NOx control ware |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040057889A1 (en) * | 2002-09-25 | 2004-03-25 | Mitsubishi Power Systems, Inc. | Real-time control for zero ammonia slip selective catalytic reduction (SCR) system |
| CN1829565A (en) * | 2003-07-28 | 2006-09-06 | 法玛通Anp有限公司 | Mixing system |
| CN202237835U (en) * | 2011-07-21 | 2012-05-30 | 邹慧明 | Static mixer |
| CN102665867A (en) * | 2009-10-29 | 2012-09-12 | 泛亚有限公司 | Exhaust gas nitrogen-removal system having a reducing-agent-mixing and noise-attenuating structure |
-
2013
- 2013-01-05 CN CN2013100021431A patent/CN103055734A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040057889A1 (en) * | 2002-09-25 | 2004-03-25 | Mitsubishi Power Systems, Inc. | Real-time control for zero ammonia slip selective catalytic reduction (SCR) system |
| CN1829565A (en) * | 2003-07-28 | 2006-09-06 | 法玛通Anp有限公司 | Mixing system |
| CN102665867A (en) * | 2009-10-29 | 2012-09-12 | 泛亚有限公司 | Exhaust gas nitrogen-removal system having a reducing-agent-mixing and noise-attenuating structure |
| CN202237835U (en) * | 2011-07-21 | 2012-05-30 | 邹慧明 | Static mixer |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105126684A (en) * | 2015-08-05 | 2015-12-09 | 沈阳理工大学 | Micro mixer with end surface phyllotaxy assignment structure |
| CN105126684B (en) * | 2015-08-05 | 2017-07-18 | 沈阳理工大学 | A kind of micro-mixer of end face phyllotaxy arrangement |
| CN105597584A (en) * | 2016-03-11 | 2016-05-25 | 济南正骐生物科技有限公司 | Static mixer |
| CN110469864A (en) * | 2019-08-08 | 2019-11-19 | 湖南大唐节能科技有限公司 | A kind of SCR subregion spray ammonia optimal control method of the preposition static mixer of band |
| CN112387090A (en) * | 2020-10-30 | 2021-02-23 | 张飞 | Electric arc formula SOx/NOx control ware |
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Application publication date: 20130424 |