CN102228793A - Rectification grille for protecting fly ash particles on catalyst layer of SCR (Semiconductor Control Rectifier) denitration device - Google Patents
Rectification grille for protecting fly ash particles on catalyst layer of SCR (Semiconductor Control Rectifier) denitration device Download PDFInfo
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- CN102228793A CN102228793A CN2011101146134A CN201110114613A CN102228793A CN 102228793 A CN102228793 A CN 102228793A CN 2011101146134 A CN2011101146134 A CN 2011101146134A CN 201110114613 A CN201110114613 A CN 201110114613A CN 102228793 A CN102228793 A CN 102228793A
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Abstract
The invention provides a rectification grille for protecting fly ash particles on a catalyst layer of an SCR (Semiconductor Control Rectifier) denitration device, belonging to the technical field of selective catalytic reduction and denitration. The rectification grille comprises cuboid grille units and a grille supporting beam, wherein the rectification grille is located at a position 5mm-10mm away from an upper surface of the catalyst layer, and consists of a plurality of cuboid grille units, each cuboid grille unit consists of a plurality of longitudinally and transversely vertical steel plates and four L-shaped angle irons, and the L-shaped angle irons are fixed to joints of the steel plates; and the rectification grille is fixedly supported on a wall surface of a flue of an SCR denitration system through the grille supporting beam. According to the invention, flue gases with a certain included angle with the vertical circulation direction before entering the rectification grille are subjected to gas-gas turbulent dissipation and gas-solid collision in each cuboid grille unit of the rectification grille, and the flue gases out of the rectification grille substantially flow downwards vertically, so that the catalyst wall surface at the lower side is prevented from being washed and eroded by solid particles, and thereby the catalyst blockage and inactivation are avoided.
Description
Technical field
What the present invention relates to is the device in a kind of SCR (SCR) denitration technology field, specifically is a kind of flow straightening grid of the SCR of being used for denitrification apparatus catalyst layer fly ash granule protection.
Background technology
Denitration method for flue gas comprises that SCR (SCR) technology, SNCR (SNCR) technology, SNCR/SCR unite gas denitrifying technology, and liquid absorption method, microorganism absorption process, active carbon adsorption, electronic beam method etc.Most widely used, the most effective at present denitrating flue gas mainstream technology is the SCR technology, and its denitration efficiency is more than 80%.The cardinal principle of selective catalytic reduction is to utilize ammonia (NH
3) as the nitrogen oxide (NO in reducing agent and the flue gas
x) under the effect of catalyst, take place redox send out should, generate nitrogen N
2With water H
2O, its main SCR denitrating technique flow process is: ammonia is spurted into flue by ammonia-spraying grid, enters the SCR Benitration reactor with the flue gas that economizer is discharged after fully mixed through mixing grid in flue, at V
2O
5/ WO
3And MoO
3Under the effect Deng catalyst, nitrogen oxide is reduced into nitrogen.SCR denitration device cold model experiment is the result show: existing denitrification apparatus catalyst layer is a porous media structure, material is fragile, be subject to fly the erosion of particle, cause the broken and obstruction of material-structure of catalyst layer with inconsistent high speed flue gas of circulating direction and ash.And temperature contains the particle bump catalyst layer wall of heavy metal Hg, chromium, lead etc. in the flue gas flying dust when high load capacity (400 ℃) is above, can stick to catalyst surface, causes catalyst poisoning.The control difficulty of the velocity direction of velocity of flue gas direction vector and fly ash particulate is bigger in the SCR denitrating system flow field, generally can only reach the technological design index reluctantly, and promptly velocity of flue gas direction vector and vertical circulating direction angle are less than 10 °.
At present, flow straightening grid commonly used is to be m * n array grid that the square steel construction of S mm constitutes by the length of side in the engineering design.The rectifier height is H mm, is fixed on the flue wall of ground floor catalyst layer top.
Existing technical literature retrieval back is being found vast sea, Cui Yichen, Gao Xiang, Cen Kefa have delivered " research of Benitration reactor flue gas flow straightening grid Field Flow Numerical Simulation " in the 38th 11 phases of volume of " thermal power generation " November in 2009.This paper has been inquired into the influence of flow straightening grid to the reactor stream field distribution, has provided the spacing of each square grid unit, grid length and with the suggested design of vertical axes (flue gas circulating direction) drift angle.But this article does not improve each optimum Design of Parameters of flow straightening grid from the angle of guard catalyst layer; especially provide based on the height of Flow Field Distribution flow straightening grid and installation site influence and optimizing design scheme that catalyst layer top velocity of flue gas direction vector distributes, also do not propose the flue gas fly ash particulate and quantitatively calculate by the CFD of flow straightening grid to the catalyst layer erosion.
Summary of the invention
The present invention is directed to the prior art above shortcomings, a kind of flow straightening grid of the SCR of being used for denitrification apparatus catalyst layer fly ash granule protection is provided, rectified action by grid, the flue gas that has certain angle with vertical circulating direction will be entered before the flow straightening grid, after in each cuboid grill unit of flow straightening grid, carrying out gas-gas turbulent dissipation, gas-solid collision, make flow out flow straightening grid the flow of flue gas direction substantially straight down, as shown in Figure 3.Particularly importantly, Gu flow straightening grid makes and is mixed in the flue gas fly ash particulate and consolidates in the grid wall-clash into, vertically fall then, the catalyst wall that makes the below is by solid particle erosion, and the catalyst of avoiding causing thus stops up, inactivation, as shown in Figure 4.
The present invention is achieved by the following technical solutions, the present invention includes: cuboid grill unit and grid brace summer, wherein: flow straightening grid is positioned at catalyst layer upper surface 5mm-10mm place and is made up of some cuboid grill unit, and each cuboid grill unit is made up of some vertical in length and breadth steel plates and four L font angle bar being fixed in the steel plate junction; Described flow straightening grid is fixedly supported on SCR denitrating system flue wall by the grid brace summer.
Described flow straightening grid is positioned at catalyst layer upper surface 5mm-10mm place.
L font angle bar in the cuboid grill unit is connected by four rivets with ganoid steel plate and realizes fixing.
Described grid brace summer is that some vertical in length and breadth steel construction cylinders constitute.
During real work of the present invention, will there be the flue gas of angle with the flue gas circulating direction in flow straightening grid, after flowing out flow straightening grid the flue gas circulating direction substantially straight down (with the flue gas circulating direction always).The flue gas that is mingled with flying dust is by flow straightening grid, and particle collides the flow straightening grid wall, and flow straightening grid also vertically drops out.
Description of drawings
Fig. 1 is the flow straightening grid structural representation;
Fig. 2 is an embodiment L font angle bar structural representation;
Among the figure: 1 ammonia-spraying grid, 2 mixes grids, 3 second groups of deflectors, 4 the 3rd groups of deflectors, 5 flow straightening grids of the present invention, 6, cuboid grill unit, 7 catalyst layers, 8L font angle bar, 9 rivets.
Fig. 3 is a flow straightening grid operation principle schematic diagram.
Fig. 4 prevents flue gas and fly ash particulate erosion principle schematic for flow straightening grid guard catalyst layer.
The different flow straightening grid height H of Fig. 5 exit velocity of flue gas vector angle＞10 ° of proportion curve synoptic diagrams.
Fig. 6 does not install flow straightening grid additional for original design and optimal design installs flow straightening grid catalyst layer upper surface velocity distribution schematic diagram additional;
Wherein: (a) do not install flow straightening grid additional; (b) install flow straightening grid additional.
The specific embodiment
Below embodiments of the invention are elaborated, present embodiment is being to implement under the prerequisite with the technical solution of the present invention, provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
As depicted in figs. 1 and 2, be whole flue of certain 300MW firepower power station SCR denitrification apparatus and flow straightening grid part, its flue outer wall dimension is 15750 * 11400 * 200mm.
Flow straightening grid 5 described in the present embodiment is positioned at catalyst layer 7 upper surface 5mm-10mm places and is made up of some cuboid grill unit 6, and each cuboid grill unit is made up of some vertical in length and breadth steel plates and four L font angle bar 8 being fixed in the steel plate junction; Described flow straightening grid is fixedly supported on SCR denitrating system flue wall by the grid brace summer.
L font angle bar 8 in the cuboid grill unit is connected by four rivets 9 with ganoid steel plate and realizes fixing.
Described grid brace summer is that some vertical in length and breadth steel construction cylinders constitute.
The height of described flow straightening grid, promptly the height of steel plate determines that according to the concrete physical dimension of the SCR denitrating system flue flow field situation inner with it CFD simulation result shows, the height optimal design 200mm of flow straightening grid by the going out of CFD software emulation.
The cross section of each cuboid grill unit 6 is the rectangle of length of side 75mm.
The steel plate vertical fixing that described L font angle bar 8 is two 30mm*30mm connects to form.
Described steel plate thickness is 3mm.
The diameter of described rivet 9 is 5mm.
Flow straightening grid is fixedly supported on SCR denitrating system flue wall by horizontal vertical 10 * 10 grid brace summers.The grid brace summer is that horizontal 10 100mm * 100mm * 15750mm steel construction cylinder constitutes, and vertical 10 100mm * 100mm * 11400mm steel construction cylinder constitutes.
Result of implementation
In the SCR of the foregoing description denitrating system flue, smoke inlet speed: 6.24m/s, spray ammonia speed: 13.4m/s, exhanst gas outlet static pressure :-1500pa, temperature is set at 648K.The diameter of fly ash particulate is the SiO of 0.5-5mm normal distribution
2, FeO and CaO mixture, density is 2000kg/Nm
3
Calculate through CFD emulation optimizing, when incidence angle is 60 ° and 45 °, differing heights H flow straightening grid, the velocity directional statistics table after flue gas flows out sees Table 1-1.By drawing in the table: be 6m/s in incidence rate vector size, when cross section, flow straightening grid unit was 75mm * 75mm, the flow straightening grid height H was the rectification effect optimum of 200mm, sees Fig. 5.
Table 1-1 flows out flow straightening grid velocity direction and vertical direction angle greater than 10 ° regional shared percentage (%)
Carry out the CFD simulation calculation with Fluent6.24 software.Original design does not add flow straightening grid protection and the angle distribution table of the velocity that installs the SCR denitrating system catalyst layer upper surface after flow straightening grid is protected additional with vertical flue gas circulating direction, sees Table 1-2.Fly ash particulate motion vector direction and vertical flue gas circulating direction angle distribution table see Table 1-3.
The angle distribution table of table 1-2 velocity of flue gas vector and vertical flue gas circulating direction
| ? | [0°，5°] | [5°，7°] | [7°，10°] | ＞10° |
| Not installing flow straightening grid velocity of flue gas angle additional distributes | 45.1％ | 43.4％ | 9.2％ | 2.3％ |
| Installing flow straightening grid velocity of flue gas angle additional distributes | 72.7％ | 21.9％ | 4.8％ | 0.6％ |
The angle distribution table of table 1-3 fly ash particulate motion vector and vertical flue gas circulating direction
| ? | [0°，5°] | [5°，7°] | ＞7° |
| Not installing flow straightening grid fly ash granule speed angle additional distributes | 84.7％ | 13.6％ | 1.7％ |
| Installing flow straightening grid fly ash granule speed angle additional distributes | 92.2％ | 7.6％ | 0.2％ |
The optimal design that installs flow straightening grid additional obviously reduces in the ratio that the zone that the non-vertical direction of catalysis stratum upper surface velocity of flue gas flows accounts for whole flow area than original design, especially at＞10 ° and [7 °, 10 °] descended 73.9% and 47.8% in the scope, see Fig. 6; The fly ash particulate direction of motion of catalyst layer upper surface also significantly reduces with the angle of vertical circulating direction, the catalyst layer erosion is being influenced bigger＞7 ° scope the most obviously (amplitude is 88.2%).
The CFD simulation result shows that the SCR denitrating system has adopted the flow straightening grid of catalyst layer fly ash granule protection; the angle of velocity of flue gas direction vector and vertical circulating direction be can reduce and the direction of motion of particle in the flue gas flying dust and the angle of vertical circulating direction reduced; can reduce erosion and the ponding of flue gas and fly ash particulate, keep activity of such catalysts and prevent that the heavy metal adhesion catalyst wall in the flying dust from causing catalyst layer to be poisoned catalyst layer.
Claims (8)
1. one kind is used for the flow straightening grid that SCR denitrification apparatus catalyst layer fly ash granule is protected, comprise: cuboid grill unit and grid brace summer, it is characterized in that: flow straightening grid is positioned at catalyst layer upper surface 5mm-10mm place and is made up of some cuboid grill unit, and each cuboid grill unit is made up of some vertical in length and breadth steel plates and four L font angle bar being fixed in the steel plate junction; Described flow straightening grid is fixedly supported on SCR denitrating system flue wall by the grid brace summer.
2. the flow straightening grid that is used for the protection of SCR denitrification apparatus catalyst layer fly ash granule according to claim 1 is characterized in that, the L font angle bar in the cuboid grill unit is connected by four rivets with ganoid steel plate and realizes fixing.
3. the flow straightening grid that is used for the protection of SCR denitrification apparatus catalyst layer fly ash granule according to claim 1 and 2 is characterized in that the cross section of each cuboid grill unit is the rectangle of length of side 75mm.
4. the flow straightening grid that is used for the protection of SCR denitrification apparatus catalyst layer fly ash granule according to claim 1 and 2 is characterized in that the steel plate vertical fixing that described L font angle bar is two 30mm*30mm connects to form.
5. the flow straightening grid that is used for the protection of SCR denitrification apparatus catalyst layer fly ash granule according to claim 2 is characterized in that described steel plate thickness is 3mm; The diameter of described rivet is 5mm.
6. the flow straightening grid that is used for the protection of SCR denitrification apparatus catalyst layer fly ash granule according to claim 1 is characterized in that, described grid brace summer is that some vertical in length and breadth steel construction cylinders constitute.
7. the flow straightening grid that is used for the protection of SCR denitrification apparatus catalyst layer fly ash granule according to claim 6 is characterized in that, total horizontal vertical 10 * 10 of described steel construction cylinder, and every is 100mm * 100mm * 11400-15750mm.
8. according to the described flow straightening grid that is used for the protection of SCR denitrification apparatus catalyst layer fly ash granule of above-mentioned arbitrary claim, it is characterized in that the height of described flow straightening grid is 200mm.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102489151A (en) * | 2011-12-19 | 2012-06-13 | 江苏科行环境工程技术有限公司 | Blockage prevention and wearing resisting device for SCR honeycomb catalyst |
| US8936662B2 (en) | 2012-10-02 | 2015-01-20 | Integrated Global Services, Inc. | Apparatus and methods for large particle ash separation from flue gas using screens having semi-elliptical cylinder surfaces |
| CN106110887A (en) * | 2016-08-25 | 2016-11-16 | 东方电气集团东方锅炉股份有限公司 | The accumulatingdust disturbing flow device with contour double-deck fairing for SCR denitration |
| CN106237839A (en) * | 2016-08-25 | 2016-12-21 | 东方电气集团东方锅炉股份有限公司 | Accumulatingdust disturbing flow device for the notch cuttype bilayer fairing of SCR denitration |
| CN108392978A (en) * | 2018-03-02 | 2018-08-14 | 上海电气电站环保工程有限公司 | A kind of SCR denitration device flow straightening grid and its material-saving optimum design method |
| CN108490219A (en) * | 2018-03-05 | 2018-09-04 | 大唐环境产业集团股份有限公司 | A kind of apparatus and method for the equipment flow relocity calculation that tests the speed for correction matrix |
| CN110508132A (en) * | 2019-09-19 | 2019-11-29 | 山东电力工程咨询院有限公司 | A kind of denitrating system and method for denitration of the denitration of gas turbine unit SCR efficient |
| CN111818987A (en) * | 2018-02-17 | 2020-10-23 | 康明公司 | Diffuser assembly and catalytic reactor including the same |
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| CN101306325A (en) * | 2008-07-07 | 2008-11-19 | 北京博奇电力科技有限公司 | Flue gas even distribution device of selective catalytic reduction reaction denitration reactor |
| CN201565262U (en) * | 2009-12-17 | 2010-09-01 | 航天环境工程有限公司 | SCR denitration vertical mixing-increaser |
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| CN101306325A (en) * | 2008-07-07 | 2008-11-19 | 北京博奇电力科技有限公司 | Flue gas even distribution device of selective catalytic reduction reaction denitration reactor |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102489151A (en) * | 2011-12-19 | 2012-06-13 | 江苏科行环境工程技术有限公司 | Blockage prevention and wearing resisting device for SCR honeycomb catalyst |
| US8936662B2 (en) | 2012-10-02 | 2015-01-20 | Integrated Global Services, Inc. | Apparatus and methods for large particle ash separation from flue gas using screens having semi-elliptical cylinder surfaces |
| CN106110887A (en) * | 2016-08-25 | 2016-11-16 | 东方电气集团东方锅炉股份有限公司 | The accumulatingdust disturbing flow device with contour double-deck fairing for SCR denitration |
| CN106237839A (en) * | 2016-08-25 | 2016-12-21 | 东方电气集团东方锅炉股份有限公司 | Accumulatingdust disturbing flow device for the notch cuttype bilayer fairing of SCR denitration |
| CN106237839B (en) * | 2016-08-25 | 2019-05-21 | 东方电气集团东方锅炉股份有限公司 | The accumulatingdust disturbing flow device of the double-deck fairing of step type for SCR denitration |
| CN111818987A (en) * | 2018-02-17 | 2020-10-23 | 康明公司 | Diffuser assembly and catalytic reactor including the same |
| CN108392978A (en) * | 2018-03-02 | 2018-08-14 | 上海电气电站环保工程有限公司 | A kind of SCR denitration device flow straightening grid and its material-saving optimum design method |
| CN108490219A (en) * | 2018-03-05 | 2018-09-04 | 大唐环境产业集团股份有限公司 | A kind of apparatus and method for the equipment flow relocity calculation that tests the speed for correction matrix |
| CN108490219B (en) * | 2018-03-05 | 2021-03-30 | 大唐环境产业集团股份有限公司 | Device and method for correcting flow velocity calculation of matrix speed measuring equipment |
| CN110508132A (en) * | 2019-09-19 | 2019-11-29 | 山东电力工程咨询院有限公司 | A kind of denitrating system and method for denitration of the denitration of gas turbine unit SCR efficient |
| CN110508132B (en) * | 2019-09-19 | 2022-03-01 | 山东电力工程咨询院有限公司 | Denitration system and denitration method for efficient denitration of SCR of gas turbine unit |
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