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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- willow
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- 230000003068 static effect Effects 0.000 title claims abstract description 19
- 238000010531 catalytic reduction reaction Methods 0.000 title description 2
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 42
- 239000010959 steel Substances 0.000 claims abstract description 42
- 241000124033 Salix Species 0.000 claims abstract description 40
- 239000002184 metal Substances 0.000 claims description 7
- 235000008331 Pinus X rigitaeda Nutrition 0.000 claims 1
- 235000011613 Pinus brutia Nutrition 0.000 claims 1
- 241000018646 Pinus brutia Species 0.000 claims 1
- 230000007797 corrosion Effects 0.000 claims 1
- 238000005260 corrosion Methods 0.000 claims 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 abstract description 28
- 238000000034 method Methods 0.000 abstract description 15
- 229910021529 ammonia Inorganic materials 0.000 abstract description 14
- 230000008569 process Effects 0.000 abstract description 13
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 10
- 239000003546 flue gas Substances 0.000 abstract description 10
- 239000012530 fluid Substances 0.000 abstract description 8
- 230000009466 transformation Effects 0.000 abstract description 4
- 230000000739 chaotic effect Effects 0.000 abstract 1
- 241000216843 Ursus arctos horribilis Species 0.000 description 17
- 230000000694 effects Effects 0.000 description 14
- 239000000428 dust Substances 0.000 description 6
- 238000013517 stratification Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 239000003054 catalyst Substances 0.000 description 4
- 238000010926 purge Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 230000013632 homeostatic process Effects 0.000 description 3
- 230000002708 enhancing effect Effects 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000000411 inducer Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 235000001968 nicotinic acid Nutrition 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
本发明公开了一种半柔性柳叶型叶片SCR静态混合器。在截面为长方形的钢制外壳沿两短边两侧间，焊接有一排钢管栅条，而一排从上至下均有多条等距布置的钢管栅条，钢管栅条上等距焊接有结构相同的半柔性柳树枝状叶栅，奇数排钢管栅条和偶数排钢管栅条上的半柔性柳树枝状叶栅错开二分之一叶栅节距排列。采用本发明是利用仿柳叶型叶片复杂排列以及流体流动过程中对叶片的吹扫产生的微弱振动而产生的流场混沌效应来增强烟道内流体的湍流度，因此烟气和氨气的混合过程得到强化，有效地减少尾部氨逃逸率，减小混合器组件的布置深度，同时能提高脱硝效率，并且克服了已投运电厂进行SCR技术改造时常遇到的空间和场地不足的问题。
The invention discloses a semi-flexible willow-shaped blade SCR static mixer. A row of steel pipe grids is welded between the two short sides of the steel shell with a rectangular cross section, and a row of steel pipe grids is equidistantly arranged from top to bottom, and steel pipe grids are welded equidistantly For the semi-flexible willow branch cascades with the same structure, the semi-flexible willow branch cascades on the odd-numbered steel pipe grid bars and the even-number steel pipe grid bars are arranged staggered by half of the cascade pitch. The present invention utilizes the complex arrangement of willow-like blades and the chaotic effect of the flow field produced by the weak vibration of the blades during the fluid flow process to enhance the turbulence of the fluid in the flue, so the mixing of flue gas and ammonia The process is strengthened, effectively reducing the tail ammonia slip rate, reducing the arrangement depth of the mixer components, and at the same time improving the denitrification efficiency, and overcoming the problems of insufficient space and site that are often encountered when SCR technical transformation is carried out in power plants that have already been put into operation.
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)
Priority Applications (1)
| 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 |
|---|---|---|---|
| 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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| CN103055734A true CN103055734A (en) | 2013-04-24 |
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| CN2013100021431A Pending 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 |