CN102410069A - SCR (Selective Catalytic Reduction) catalytic conversion muffler - Google Patents
SCR (Selective Catalytic Reduction) catalytic conversion muffler Download PDFInfo
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- CN102410069A CN102410069A CN2011103782666A CN201110378266A CN102410069A CN 102410069 A CN102410069 A CN 102410069A CN 2011103782666 A CN2011103782666 A CN 2011103782666A CN 201110378266 A CN201110378266 A CN 201110378266A CN 102410069 A CN102410069 A CN 102410069A
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Abstract
The invention discloses an SCR (Selective Catalytic Reduction) catalytic conversion muffler, which comprises a front cavity body, a carrier cavity body, a back cavity body and an air outlet pipe that are sequentially and coaxially connected, wherein a catalyst carrier is arranged in the carrier cavity body; a catalyst is coated on the catalyst carrier; a porous air inlet pipe is vertically arranged on the front cavity body; through holes which are uniformly and circumferentially arranged are arranged on the pipe wall of the porous air inlet pipe located in the front cavity body. The SCR catalytic conversion muffler is characterized in that the bottom of the porous air inlet pipe is hung in the air; and a closed end cover is arranged at the bottom of the porous air inlet pipe. According to the SCR catalytic conversion muffler disclosed by the invention, a urea solution is effectively prevented from crystallizing, and the atomization degree of the urea solution is improved. Meanwhile, the air inlet pipe is vertically arranged so that the overall structure of the catalytic conversion muffler is more compact, the condition that the catalytic reduction reaction is affected by deposited particles in an exhaust gas flow blocking a carrier passage is avoided. While the porous air inlet pipe effectively reduces system noises, the distribution uniformity of reactants in the carrier can be remarkably improved, thereby effectively improving the catalytic conversion of tail gas.
Description
Technical field
The present invention relates to the automobile exhaust system field, relate in particular to a kind of automobile SCR after-treatment system, relate to a kind of SCR catalyzed conversion silencing apparatus in particular.
Background technique
At present, the SCR after-treatment system in the utilization in large diesel engine reprocessing field more and more widely.In general, existing catalyzed conversion silencing apparatus all requires under the prerequisite that satisfies exhaust back pressure and not loss effective engine power, reduces the NOx discharging as much as possible.Therefore present automobile exhaust system all requires the urea water pyrolysis that before arriving catalyst carrier, can atomize fully, and mixes fully with tail gas, and then carrier surface reacts fully in the SCR catalyst converter, reaches the purpose of the discharge amount that reduces NOx.The vertically arranged catalyzed conversion silencing apparatus of suction tude and carrier form can better meet the entrucking requirement of motor; And make the entire reaction apparatus structure compact more; But distinct issues of this structure are tail gas pass through suction tude and get into catalyst converter after; Distributing homogeneity in catalyst carrier is lower, thereby influences the conversion ratio of NOx.
The content of invention
What the present invention will solve is exactly the problems referred to above that existing technology exists; Aim to provide a kind of SCR catalyzed conversion silencing apparatus; Not only can effectively reduce system noise, can also improve the uniformity that carrier internal reaction thing distributes significantly, thereby effectively raise the catalytic conversion efficiency of tail gas.
In order to address the above problem, the technological scheme that this patent adopts is:
A kind of SCR catalyzed conversion silencing apparatus; Comprise preceding cavity, carrier cavity and the rear chamber and the steam outlet pipe of coaxial connection successively, be provided with catalyst carrier in the described carrier cavity, on described catalyst carrier, be coated with catalyzer; Be vertically installed with the porous suction tude on the cavity before described; Offer the perforation of circumferentially evenly arranging on the tube wall that is positioned at preceding cavity of porous suction tude, it is characterized in that the unsettled setting in bottom of said porous suction tude, and be provided with closed end cap.
The present invention is provided with the equally distributed perforation of 360 degree on suction tude, and makes suction tude unsettled layout in preceding cavity, and is provided with closed end cap, thereby makes air-flow after getting into suction tude, from perforation, is discharged in the preceding cavity uniformly.Because the unsettled setting in bottom of porous suction tude makes suction tude tail end and preceding cavity inner wall keep certain distance, guarantees that air-flow can pass through, and avoids causing mobile blind area in the suction tude end edge region.Analyze through FLUENT special designs computed in software, the back pressure that this structure produces is smaller, reaches both to make air-flow distributing homogeneity before catalyst carrier improve, and can not produce the purpose of very big pressure drop again.And the design of boring a hole on suction tude and the mixing arrangement also has certain effect to reducing system noise.
As further improvement of the present invention, in preceding cavity, be provided with the porous mixing arrangement before being positioned at catalyst carrier, be furnished with equally distributed perforation on the described porous mixing arrangement.The porous mixing arrangement is set before catalyst carrier; Not only can avoid the solid particle and the direct contact catalysis agent carrier of urea droplets of pyrolysis not in the waste gas; Can also make the preceding carrier of catalyst carrier produce certain backflow and disturbance, improve the mixing uniformity of tail gas and urea.
According to the present invention, the porous mixing arrangement can be flat board before the catalyst carrier, also can be the rased panel that has certain radian, and this convex surface is best when deviating from catalyst carrier.This porous mixing arrangement can effectively be avoided the solid particle and the direct contact catalysis agent carrier of urea droplets of pyrolysis not in the waste gas, can also make the carrier before the catalyst carrier produce certain backflow and disturbance, improves the mixing uniformity of tail gas and urea.
According to the present invention, the piercing aperture on the porous mixing arrangement should be preferably 1.5-2 times of suction tude perforation greater than the piercing aperture on the suction tude, avoids causing the excessive pressure loss.
According to the present invention, connect through anchor ear between each cavity, whole catalyzed conversion silencing apparatus is connected with exhaust duct through flange.
According to the present invention, porous suction tude and the employing 304 of porous mixing arrangement and above corrosion protection stainless steel are made.
Description of drawings
Fig. 1 is a SCR catalyzed conversion silencing apparatus schematic representation.
Be labeled as among the figure: 1, preceding cavity; 2, carrier cavity; 3, rear chamber; 4, porous suction tude; 5, front cover; 6, closed end cap; 7, porous mixing arrangement; 8, steam outlet pipe; 9, rear end cover; 10, adpting flange; 11, anchor ear; 12, anchor ear; 13, the perforation on the suction tude; 14, the perforation on the porous mixing arrangement.
Fig. 2 is a convex surface formula porous air feeder structure schematic representation.
Fig. 3 is the right elevation of Fig. 2.
Fig. 4 is flat porous mixing arrangement structural representation.
Fig. 5 is the right elevation of Fig. 4.
Embodiment
Contrast accompanying drawing below; Through description to embodiment; To the embodiment of this patent, for example: the effect of mutual alignment relation between the shape of structure, structure and the each several part and annexation, each several part and working principle etc. are done further detailed explanation.
The present invention is a kind of SCR catalyzed conversion silencing apparatus; Through perforation is set and design porous mixing arrangement before catalyst carrier on the suction tude of bottom sealing; Make the air-flow that gets into preceding inside cavity obtain higher distributing homogeneity; Effectively prevent simultaneously the solid particle deposition blocking catalyst carrier passage in urea crystals and the tail gas, thereby reach the purpose of the catalytic conversion raising that makes whole catalytic reduction after-treatment system.In addition, this structure can also effectively reduce the noise of whole catalytic converter.
Of Fig. 1; A kind of SCR catalyzed conversion silencing apparatus of the present invention comprises porous suction tude 4, preceding cavity 1, carrier cavity 2, rear chamber 3, front cover 5, rear end cover 9, steam outlet pipe 8, perforated tube closed end cap 6, porous mixing arrangement 7, connects anchor ear 11 and 12 and flange 10.Before being vertically set on, said porous suction tude 4 on the cavity 1, the circumferential equally distributed perforation 13 of 360 degree is set, and a unsettled end is provided with closed end cap 6 in catalyst converter on the tube wall that is positioned at ante-chamber body 1 on the suction tude 4.Porous mixing arrangement 7 is set before catalyst carrier.
Pass through anchor ear 11 and 12 coaxial successively connections before described between cavity 1, carrier cavity 2, the rear chamber 3.The inlet end of suction tude 4 is connected with exhaust duct through flange 10, thereby makes whole catalyzed conversion silencing apparatus and exhaust duct UNICOM.
The unsettled setting in preceding cavity 1 of described porous suction tude 4, and closed end cap 6 is set, most of fluid of avoiding the free end opening to be caused flows out from the suction tude bottom, causes fluid distribution inhomogeneous.
Described closed end cap 6 maintains certain distance with the inwall of preceding cavity 1, thereby the fluid in the cavity 1 can be avoided producing the blind area of flowing in this zone through the zone between suction tude bottom and the catalyst carrier before making.
With reference to Fig. 3 and Fig. 4, before described porous mixing arrangement 7 is arranged in catalyst carrier, be furnished with perforation 14 above uniformly, air-flow is passed through uniformly.
Described porous mixing arrangement 7 has the rased panel of certain radian; And it is best when this convex surface deviates from catalyst carrier; Can effectively avoid the solid particle and the direct contact catalysis agent carrier of urea droplets of pyrolysis not in the waste gas; Can also make the preceding carrier of catalyst carrier produce certain backflow and disturbance, improve the mixing uniformity of tail gas and urea.
According to the present invention, the aperture of the perforation 14 on the porous mixing arrangement should be preferably the aperture of 1.5-2 times of suction tude perforation greater than the aperture of the perforation on the suction tude 13, avoids causing the excessive pressure loss.
With reference to Fig. 5 and Fig. 6, described porous mixing arrangement 7 is the mode of execution of plate armature, also can reach the corresponding techniques effect.
The above-mentioned accompanying drawing that combines has carried out exemplary description to the present invention, but concrete realization of the present invention does not receive the restriction of aforesaid way.As long as adopted the improvement of the various unsubstantialities that design of the present invention and technological scheme carry out, or design of the present invention and technological scheme are directly applied to other occasion, all within protection scope of the present invention without improving.
Adopt technological scheme of the present invention; Not only can improve the distributing homogeneity of catalyst carrier internal gas flow; Can effectively prevent simultaneously the solid particle deposition blocking catalyst carrier passage in urea crystals and the tail gas, thereby reach the purpose of the catalytic conversion raising that makes whole catalytic reduction after-treatment system.In addition, this structure can also effectively reduce the noise of whole catalytic converter.
Claims (7)
1. SCR catalyzed conversion silencing apparatus; Preceding cavity (1), carrier cavity (2) and the rear chamber (3) and the steam outlet pipe (8) that comprise coaxial connection successively; Be provided with catalyst carrier in the described carrier cavity (2); On described catalyst carrier, be coated with catalyzer, be vertically installed with porous suction tude (4) on the described preceding cavity (1), offer the perforation (13) of circumferentially evenly arranging on the tube wall that is positioned at preceding cavity (1) of porous suction tude (4); It is characterized in that the unsettled setting in bottom of said porous suction tude (4), and be provided with closed end cap (6).
2. according to right 1 described a kind of SCR catalyzed conversion silencing apparatus, it is characterized in that in preceding cavity (1), be provided with porous mixing arrangement (7) before being positioned at catalyst carrier, be furnished with equally distributed perforation (14) on the described porous mixing arrangement (7).
3. according to right 2 described a kind of SCR catalyzed conversion silencing apparatuss, it is characterized in that described porous mixing arrangement (7) for dull and stereotyped, or have certain radian rased panel, and convex surface deviates from catalyst carrier.
4. according to right 2 described a kind of SCR catalyzed conversion silencing apparatuss, it is characterized in that the aperture of the aperture of the perforation (14) on the porous mixing arrangement greater than the perforation on the suction tude (13).
5. according to right 3 described a kind of SCR catalyzed conversion silencing apparatuss, it is characterized in that the aperture of aperture 1.5-2 times of perforation (13) on suction tude of the perforation (14) on the porous mixing arrangement.
6. according to right 1 described a kind of SCR catalyzed conversion silencing apparatus; It is characterized in that described preceding cavity (1) is connected through first anchor ear (11) with carrier cavity (2); Described carrier cavity (2) is connected through second anchor ear (12) with rear chamber (3), and the inlet end of said suction tude (4) is connected with exhaust duct through flange (10).
7. according to any one described a kind of SCR catalyzed conversion silencing apparatus of right 1-6, it is characterized in that employing 304 of described porous suction tude (4) and porous mixing arrangement (7) and the making of above corrosion protection stainless steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103782666A CN102410069A (en) | 2011-11-24 | 2011-11-24 | SCR (Selective Catalytic Reduction) catalytic conversion muffler |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103782666A CN102410069A (en) | 2011-11-24 | 2011-11-24 | SCR (Selective Catalytic Reduction) catalytic conversion muffler |
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| CN102410069A true CN102410069A (en) | 2012-04-11 |
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| CN2011103782666A Pending CN102410069A (en) | 2011-11-24 | 2011-11-24 | SCR (Selective Catalytic Reduction) catalytic conversion muffler |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104121081A (en) * | 2014-07-02 | 2014-10-29 | 潍柴动力股份有限公司 | Air inlet pipe of SCR tail gas processing system and SCR tail gas processing system |
| CN104196602A (en) * | 2014-03-06 | 2014-12-10 | 万向通达股份公司 | Automobile discharge postprocessor assembly |
| DE102013114111A1 (en) * | 2013-12-16 | 2015-06-18 | Tenneco Gmbh | Mixing tube arrangement with housing |
| CN105041433A (en) * | 2015-09-01 | 2015-11-11 | 安徽江淮汽车股份有限公司 | Automotive SCR system |
| CN107269361A (en) * | 2016-03-31 | 2017-10-20 | 曼柴油机和涡轮机欧洲股份公司 | Discharge gas aftertreatment system, internal combustion engine and the method for operating it |
| CN107269346A (en) * | 2017-06-16 | 2017-10-20 | 上海斯瑞佛汽车零部件有限公司 | Engine exhaust muffler |
| CN110714821A (en) * | 2019-10-29 | 2020-01-21 | 中车大连机车研究所有限公司 | Compact special-shaped selective catalytic reduction reactor |
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| JP2005163622A (en) * | 2003-12-02 | 2005-06-23 | Calsonic Kansei Corp | Catalytic converter |
| CN201354668Y (en) * | 2009-01-22 | 2009-12-02 | 重庆迈崴机器有限公司 | Engine tail gas purification muffler |
| CN101666256A (en) * | 2009-09-09 | 2010-03-10 | 无锡市凯龙汽车设备制造有限公司 | Diesel SCR catalytic muffler |
| CN101745314A (en) * | 2008-12-18 | 2010-06-23 | 上海天纳克排气系统有限公司研发分公司 | Selective catalytic reduction converter |
| CN101782009A (en) * | 2009-01-15 | 2010-07-21 | 上海天纳克排气系统有限公司研发分公司 | Catalytic converter for diesel motor exhaust |
| JP2011185176A (en) * | 2010-03-09 | 2011-09-22 | Hitachi Constr Mach Co Ltd | Exhaust emission control device |
| CN202391522U (en) * | 2011-11-24 | 2012-08-22 | 杭州银轮科技有限公司 | SCR (selective catalytic reduction) catalytic conversion muffler |
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2011
- 2011-11-24 CN CN2011103782666A patent/CN102410069A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2005163622A (en) * | 2003-12-02 | 2005-06-23 | Calsonic Kansei Corp | Catalytic converter |
| CN101745314A (en) * | 2008-12-18 | 2010-06-23 | 上海天纳克排气系统有限公司研发分公司 | Selective catalytic reduction converter |
| CN101782009A (en) * | 2009-01-15 | 2010-07-21 | 上海天纳克排气系统有限公司研发分公司 | Catalytic converter for diesel motor exhaust |
| CN201354668Y (en) * | 2009-01-22 | 2009-12-02 | 重庆迈崴机器有限公司 | Engine tail gas purification muffler |
| CN101666256A (en) * | 2009-09-09 | 2010-03-10 | 无锡市凯龙汽车设备制造有限公司 | Diesel SCR catalytic muffler |
| JP2011185176A (en) * | 2010-03-09 | 2011-09-22 | Hitachi Constr Mach Co Ltd | Exhaust emission control device |
| CN202391522U (en) * | 2011-11-24 | 2012-08-22 | 杭州银轮科技有限公司 | SCR (selective catalytic reduction) catalytic conversion muffler |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102013114111A1 (en) * | 2013-12-16 | 2015-06-18 | Tenneco Gmbh | Mixing tube arrangement with housing |
| EP3084163B1 (en) * | 2013-12-16 | 2017-11-29 | Tenneco GmbH | Mixing pipe arrangement with housing |
| US10072550B2 (en) | 2013-12-16 | 2018-09-11 | Tenneco Gmbh | Mixing pipe arrangement with housing |
| CN104196602A (en) * | 2014-03-06 | 2014-12-10 | 万向通达股份公司 | Automobile discharge postprocessor assembly |
| CN104121081A (en) * | 2014-07-02 | 2014-10-29 | 潍柴动力股份有限公司 | Air inlet pipe of SCR tail gas processing system and SCR tail gas processing system |
| CN105041433A (en) * | 2015-09-01 | 2015-11-11 | 安徽江淮汽车股份有限公司 | Automotive SCR system |
| CN107269361A (en) * | 2016-03-31 | 2017-10-20 | 曼柴油机和涡轮机欧洲股份公司 | Discharge gas aftertreatment system, internal combustion engine and the method for operating it |
| CN107269361B (en) * | 2016-03-31 | 2021-10-08 | 曼恩能源方案有限公司 | Exhaust gas aftertreatment system, internal combustion engine and method for operating the same |
| CN107269346A (en) * | 2017-06-16 | 2017-10-20 | 上海斯瑞佛汽车零部件有限公司 | Engine exhaust muffler |
| CN107269346B (en) * | 2017-06-16 | 2019-05-21 | 上海斯瑞佛汽车零部件有限公司 | Engine exhaust muffler |
| CN110714821A (en) * | 2019-10-29 | 2020-01-21 | 中车大连机车研究所有限公司 | Compact special-shaped selective catalytic reduction reactor |
| CN110714821B (en) * | 2019-10-29 | 2024-05-14 | 中车大连机车研究所有限公司 | Compact special-shaped selective catalytic reduction reactor |
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Application publication date: 20120411 |