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CN1177128C - Automotive Exhaust Gas Catalyst Based on Spherical Arc Honeycomb Panel - Google Patents

Automotive Exhaust Gas Catalyst Based on Spherical Arc Honeycomb Panel

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Publication number
CN1177128C
CN1177128C CNB021374341A CN02137434A CN1177128C CN 1177128 C CN1177128 C CN 1177128C CN B021374341 A CNB021374341 A CN B021374341A CN 02137434 A CN02137434 A CN 02137434A CN 1177128 C CN1177128 C CN 1177128C
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China
Prior art keywords
honeycomb
spherical arc
section
conical
main carrier
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Expired - Fee Related
Application number
CNB021374341A
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Chinese (zh)
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CN1403691A (en
Inventor
吴国江
黄震
张武高
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Shanghai Jiao Tong University
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Shanghai Jiao Tong University
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Priority to CNB021374341A priority Critical patent/CN1177128C/en
Publication of CN1403691A publication Critical patent/CN1403691A/en
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

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Abstract

一种基于球弧蜂窝板的汽车尾气催化器，包括扩展段和催化器主载体段，在扩展段进口面上设有多孔球弧蜂窝板，并与扩展段的锥形外壳及尾气管可靠连接固定，球弧蜂窝板上密布与球弧表面垂直的流道，流道最大偏离轴心线的角度为扩展段的扩展角。主载体段由锥形蜂窝片离散排列组成，锥形蜂窝片厚度均匀，其流道方向与锥面和球弧表面垂直。本发明的球弧蜂窝板可用于汽油机催化器，也可用于柴油机催化器，能使尾气流速均匀，传质速率提高，有效减小催化器的径向半径，降低有害排放量。

Figure 02137434

An automotive exhaust catalyst based on spherical arc honeycomb panels, including an extension section and a main carrier section of the catalyst, a porous spherical arc honeycomb panel is provided on the inlet surface of the extension section, and is reliably connected to the conical shell of the extension section and the exhaust pipe Fixed, the ball-arc honeycomb plate is densely covered with flow channels perpendicular to the surface of the ball arc, and the maximum angle of flow channel deviation from the axis line is the expansion angle of the expansion section. The main carrier section is composed of discrete arrangements of conical honeycomb sheets, the thickness of the conical honeycomb sheets is uniform, and the flow channel direction is perpendicular to the conical surface and the spherical arc surface. The spherical arc honeycomb plate of the invention can be used in gasoline engine catalytic converters, and can also be used in diesel engine catalytic converters, which can make the exhaust flow rate uniform, increase the mass transfer rate, effectively reduce the radial radius of the catalytic converter, and reduce harmful emissions.

Figure 02137434

Description

Automotive exhaust catalysis device based on ball arc cellular board
Technical field:
The present invention relates to a kind of automotive exhaust catalysis device, relate in particular to a kind of automotive exhaust catalysis device, mainly solve the flow velocity optimization problem of expanding section and catalyst converter main carrier section in the tail gas catalyzed reaction system in petrol engine and the diesel engine based on ball arc cellular board.
Background technique:
The velocity flow profile that flows through catalyst converter is to the volume utilization efficiency, and catalytic conversion efficiency all has material impact working life.Usually catalyst converter is the honeycomb ceramics that is formed by resistant to elevated temperatures pottery or alloy material compacting, scribble on the small runner wall in honeycomb ceramics and contain noble metal platinum, the porous active layer of rhodium etc., harmful matter NOx in the tail gas, carbon monoxide and hydrocarbonly when flowing through the infinitesimal runner, be converted into innoxious substance by mass transfer chemical reaction on active coating.The active coating that is coated on the small runner wall of catalyst converter is worn through out-of-date meeting at tail gas, its degree of wear is directly proportional with 2 to 5 powers of tail gas flow velocity, the uneven distribution of flow velocity makes catalyst converter internal shunt road have higher flow velocity, the catalytically active coatings that is coated on these runner walls bears very big concentrated wear, these runners just early lose catalysis, and the catalyzed conversion function of the catalytically active coatings on the lower runner wall of flow velocity is again less than making full use of, and the result is that the volume utilization rate of whole catalyst converter working life and catalyst converter reduces; The spatial velocity that the catalytic conversion efficiency of catalyst converter and tail gas stream are crossed is inversely proportional to, the uneven distribution of flow velocity has also increased the tail gas local space speed of part runner, even the tail gas of runner process also was lower than the normal catalytic transformation efficiency before concentrated wear in this section.It should be noted that the harmful gas amount that catalyst converter the first two minute when engine cold starting discharge accounts for 60～70% of total amount.The inhomogeneous catalyst converter that flows through of tail gas is thought in research, and the noxious emission amount during the cold starting also becomes higher, in addition this therebetween catalyst body be heated also more inhomogeneously, produce very big thermal stress, easier damage.Therefore the flow velocity in the catalyst converter evenly distributes and is height institute hope, at first should consider when the design catalyst system, it is generally acknowledged, it is just unacceptable that the mobile evenness index that flows through catalyst converter is lower than at 0.7 o'clock.
Catalyst system is by expanding section, and catalyst converter carrier section and contraction section are formed.In order to make the tail gas spatial velocity that flows through catalyst converter in reasonable range, guarantee that tail gas carries out catalytic reaction the time of contact on catalyst surface, the cross-section area of catalyst converter carrier section will be much larger than the cross-section area on the inlet face.Therefore one expansion changeover portion is arranged between catalyst converter carrier front-end face and tail gas inlet face.But owing to the jet coherence effect that tail gas enters expanding section by inlet face, near the feasible mobile center region of shaft axis that concentrates on, test and calculating show that all in the very big recirculating zone of formation, expanding section both sides, the flow velocity that consequently flows through catalyst converter is very inhomogeneous.
There are many factors can influence the velocity flow profile that flows through catalyst converter.For example the inhomogeneous meeting of the expanding section inlet face velocity flow profile that causes of the bending of outlet pipe makes that the velocity flow profile in the catalyst converter is more inhomogeneous.The inhomogeneous of this expanding section inlet face velocity flow profile is arranged near more obvious near the engine exhaust port in catalyst system, and in order to improve catalyzer cold starting temperature therebetween rapidly, reduces this noxious emission therebetween.Catalyst system is arranged near being an effectively way near the engine exhaust port.But flowing near the outlet pipe the engine export is very complicated, and it is more inhomogeneous to flow, and near the free space the engine export is very limited simultaneously, also is so even install under car, and be higher to the size requirement of catalyst converter.
The extended corner of expanding section is more little, and the velocity flow profile in the catalyst converter is even more, but the length of expanding section is also long more simultaneously, means that occupation space is also many more, in addition extended corner to reduce degree that velocity flow profile is improved also very limited.The existing employing adds a circular baffle plate in the middle of expanding section, by numerical value that the flow field the is done simulation to system, find the recirculating zone to have occurred behind the baffle plate, and most of tail gas flows through towards the outside of catalyst converter carrier, and velocity flow profile is more inhomogeneous.In order to eliminate the recirculating zone behind the baffle plate, the inventor adopts the baffle plate that is installed with porous to carry out numerical simulation, compares with the situation that does not add porous slab, and flow uniformity significantly improves, but be suspended in the fixing pretty troublesome of aerial perforated baffle, also be difficult to bear the long-term impact of tail gas.
Summary of the invention:
The objective of the invention is at the deficiencies in the prior art, a kind of automotive exhaust catalysis device based on ball arc cellular board is provided, tail gas is evenly flowed out, simultaneously simple in structure, the size that reduces catalyst converter is to adapt to the confined space after catalyst converter moves forward to relief opening.
For realizing such purpose, in the technological scheme of the present invention, the automotive exhaust catalysis device of design comprises expansion segment body and catalyst converter main carrier section, a porous ball arc cellular board is set on the expanding section inlet face, the end face of porous ball arc cellular board is a planar annular with perforate, and conical shell and offgas duct by welding or flange and expanding section are connected and fixed.The thickness of ball arc cellular board is even substantially, and the ratio in thickness and aperture is preferentially selected 2～5 scope for use within 1～10 scope.The basic at interval runner that equates gathers on the ball arc cellular board, the circulation area that runner constituted is substantially equal to the cross-section area of catalyst converter main carrier section, runner direction and ball arc Surface Vertical, the angle of its maximum deviation shaft axis is the extended corner of expanding section, that is to say that the runner direction of edge is consistent with the expanding surface direction of expanding section.Substantially assurance is parallel with shell surface from the tail gas near the expansion shell that ball arc cellular board comes out on flow technique like this, and the catalyst converter carrier can evenly be expanded and enter substantially equably to tail gas in expanding section.Tail gas does not form the vortex at expanding section, has reduced flow losses, reaches the purpose that tail gas evenly enters the catalyst converter carrier catalysis.
Maximum angle vertical with spherical cambered surface according to the runner direction of above ball arc cellular board and its direction and shaft axis is the principle at shell extension angle, the inside diameter of porous ball arc cellular board is determined by formula d/Sin α, wherein d is an offgas duct diameter before the expanding section, and α is the extended corner of expanding section.After the present invention had adopted ball arc cellular board, the mobile uniformity had reached more than 0.9.
Runner wall on the ball arc cellular board of the present invention can be coated catalytic active layer, and coating preferentially is made of a mesosphere, as Woelm Alumina (Al 2O 3), be platinum (Pt) and/or rhodium (Rh) wherein as catalytic specie.So just can make full use of the space segment of expansion segment body.
The present invention because its thickness has only about 5mm, can more promptly be heated by tail gas in cold starting after ball arc cellular board is coated catalytic active layer therebetween, and the temperature of catalytic active layer rises faster, can reduce cold starting noxious emission amount therebetween.
Catalyst converter main carrier section of the present invention is made up of several taper honeycomb sheets, and taper honeycomb sheet is discrete the arrangement in the cylinder blanket of main carrier section, and fixes by back-up ring, and the gap between sheet and the sheet is 0.5mm～2mm, preferentially selects 1mm for use.The cone angle of taper honeycomb sheet is decided as required, but should not be less than 45 degree.Taper honeycomb sheet has a width to be no more than the limit of 5mm, and at vertex of a cone place one arc transition section is arranged.Taper honeycomb sheet thickness is even substantially, and its value is no more than 5mm and is advisable, and thickness is 5 to 10 times with the ratio in aperture, and taper honeycomb sheet runner direction is vertical with cambered surface with the conical surface basically.
The taper honeycomb chip architecture of catalyst converter main carrier of the present invention can guarantee that the tail gas component mass transfer in the honeycomb channel is higher more than 5 times than channel thickness and the big structure in 10 of diameter to the mass transfer rate of active coating.The direction in cone sheets upper runner hole is vertical with cone sheets, and the cone angle of cone sheets is expressed as β, and its circulation area is that porosity ratio multiply by π r 2/ Sin (0.5 β), wherein r is awl end radius of a circle, as cone angle is 60 degree, in the circulation area of the next cone sheets of situation of same porosity ratio 2 times of planar wafer, perhaps when same voids and circulation area, the radially radius of catalyst converter main body of the present invention can dwindle 0.7 times, has effectively reduced the requirement to installing space.
Porous ball arc cellular board of the present invention can be connected and fixed with the flange on the inlet face, this being connected and fixed reliably and convenience.
The present invention is mainly used in the tail gas catalyzed catalyst system of petrol engine, also can be used for the diesel engine vent gas catalyst system.
The drawing explanation:
Fig. 1 is used for petrol engine tail gas catalyzing unit embodiment's structural representation for the present invention.
As shown in the figure, the present invention includes expanding section 1 and catalyst converter main carrier section, a porous ball arc cellular board 2 is set on expanding section 1 inlet face, the shell of expanding section 1 and ball arc cellular board 2 are connected and fixed with offgas duct 8.Runner 3 gathers on the ball arc cellular board 2, catalyst converter main carrier section is made up of nearly 20 taper honeycomb sheet 4, taper honeycomb sheet 4 is discrete arrangement and fixing by back-up ring 7 in the cylinder blanket 6 of main carrier section, and runner 5 directions of taper honeycomb sheet 4 are vertical with cambered surface with the conical surface.
Fig. 2 is used for diesel engine vent gas catalyst converter embodiment's structural representation for the present invention
Among Fig. 2, a porous ball arc cellular board 2 is set on expanding section 1 inlet face, and the shell of expanding section 1 and ball arc cellular board 2 are connected and fixed with offgas duct 8, and runner 3 gathers on the ball arc cellular board 2, catalyst converter main carrier 9 is a wall-flow type, and tail gas enters an infinitesimal runner 10 from the catalyst converter inlet face.
Embodiment:
Below in conjunction with accompanying drawing technological scheme of the present invention is further described.
As shown in Figure 1, the present invention is mainly used in the automotive exhaust catalysis device of petrol engine, comprise expanding section 1 and catalyst converter main carrier section, a porous ball arc cellular board 2 is set on expanding section 1 inlet face, the shell of expanding section 1 and ball arc cellular board 2 are connected and fixed by welding or flange with offgas duct 8.Gather on the ball arc cellular board 2 and ball arc Surface Vertical, the interval equates substantially, diameter is 1mm runner 3, the angle of runner 3 maximum deviation shaft axiss is the extended corner of expanding section 1.The wall of runner 3 is covered with platinum, noble metal active layers such as rhodium.Catalyst converter main carrier section is made up of about 20 taper honeycomb sheet 4, and taper honeycomb sheet 4 is discrete the arrangement in the cylinder blanket 6 of main carrier section, and fixing by back-up ring 7, and the gap between the taper honeycomb sheet 4 is 1mm.The cone angle of taper honeycomb sheet 4 is not less than 45 degree.Taper honeycomb sheet 4 has an arc transition section at vertex of a cone place.Taper honeycomb sheet 4 thickness are even substantially, and its value generally is no more than 5mm and is advisable.The direction of taper honeycomb sheet runner 5 is vertical with cambered surface with the conical surface basically.
The uneven tail gas of velocity flow profile arrives ball arc cellular board 2 inner chambers, through the integration of this inner chamber, flows out equably from runner 3, evenly flows through at extending section with expanding, and enters taper honeycomb sheet.Tail gas has experienced the pre-catalytic reaction of ball arc cellular board 2, has experienced the taper honeycomb sheet 4 multistage catalytic reactions as the main catalytic body again.This catalyst system especially is fit to be installed near the petrol engine relief opening.
Fig. 2 is used for the diesel engine vent gas catalyst system for ball arc cellular board of the present invention.Runner 3 walls of ball arc cellular board 2 are not coated with catalytic active layer, and runner 3 diameters are 2mm, and all the other parameters of ball arc cellular board 2 are same as in figure 1.Catalyst converter main carrier 9 is a wall-flow type, and promptly tail gas enters an infinitesimal runner 10 from the catalyst converter inlet face, flows into its peripheral infinitesimal runner by the porous medium wall, and flows out from these runners.Tail gas has changed the jet effect that enters expanding section 1 through ball arc cellular board 2, and expanding section is flow through in expansion equably, and evenly enters wall-flow type catalyst converter main carrier.Because the reason on the manufacturing technology, wall-flow type catalyst converter main carrier still adopts whole pillar shape.

Claims (5)

1、一种基于球弧蜂窝板的汽车尾气催化器，包括扩展段(1)和催化器主载体段，其特征在于扩展段(1)进口面上设有多孔球弧蜂窝板(2)，球弧蜂窝板(2)的开孔环形端面与扩展段(1)的锥形外壳及扩展段前尾气管(8)连接固定，球弧蜂窝板(2)的直径由公式d/Sinα确定，其中d为尾气管(8)直径，α为扩展段(1)的扩展角，球弧蜂窝板(2)上密布间隔基本相等、与球弧表面垂直的流道(3)，流道(3)最大偏离轴心线的角度为扩展段(1)的扩展角。1, a kind of automobile tail gas catalytic converter based on spherical arc honeycomb plate, comprise expansion section (1) and catalytic converter main carrier section, it is characterized in that expansion section (1) inlet face is provided with porous spherical arc honeycomb plate (2), The circular end surface of the opening of the spherical arc honeycomb panel (2) is connected and fixed with the conical shell of the extension section (1) and the front exhaust pipe (8) of the extension section. The diameter of the spherical arc honeycomb panel (2) is determined by the formula d/Sinα, Among them, d is the diameter of the exhaust pipe (8), α is the expansion angle of the expansion section (1), and the spherical arc honeycomb panel (2) is densely covered with flow channels (3) with substantially equal intervals and perpendicular to the surface of the spherical arc, and the flow channels (3) ) The maximum angle of deviation from the axis line is the expansion angle of the expansion section (1). 2、如权利要求1所说的基于球弧蜂窝板的汽车尾气催化器，其特征在于球弧蜂窝板(2)的流道(3)壁面涂有贵金属催化活性层，涂层中催化物质是铂和/或铑。2. The automobile tail gas catalyst based on the spherical arc honeycomb plate as claimed in claim 1, characterized in that the wall surface of the flow channel (3) of the spherical arc honeycomb plate (2) is coated with a noble metal catalytic active layer, and the catalytic substance in the coating is Platinum and/or Rhodium. 3、如权利要求1所说的基于球弧蜂窝板的汽车尾气催化器，其特征在于球弧蜂窝板(2)的流道(3)直径选用2～5mm。3. The automobile exhaust catalyst based on the spherical arc honeycomb panel as claimed in claim 1, characterized in that the diameter of the flow channel (3) of the spherical arc honeycomb panel (2) is 2-5mm. 4、如权利要求1所说的基于球弧蜂窝板的汽车尾气催化器，其特征在于球弧蜂窝板(2)的厚度均匀，厚度与孔径之比为1～10，优先选用2～5。4. The automotive exhaust catalyst based on spherical arc honeycomb panels as claimed in claim 1, characterized in that the thickness of the spherical arc honeycomb panels (2) is uniform, and the ratio of thickness to aperture is 1-10, preferably 2-5. 5、如权利要求1所说的基于球弧蜂窝板的汽车尾气催化器，其特征在于催化器主载体段由锥形蜂窝片(4)组成，锥形蜂窝片(4)在主载体段的圆柱形外壳(6)内离散排列，并通过挡圈(7)固定，锥形蜂窝片(4)之间的间隙为0.5mm～2mm，锥形蜂窝片(4)的锥角不小于45度，厚度不超过5mm，锥形蜂窝片(4)有一宽度不超过5mm的边，并在锥顶处有一圆弧过渡段，锥形蜂窝片(4)的流道(5)方向与锥面和球弧表面垂直。5. The automotive exhaust catalyst based on spherical arc honeycomb panels as claimed in claim 1, characterized in that the main carrier section of the catalytic converter is composed of conical honeycomb sheets (4), and the conical honeycomb sheets (4) are formed in the main carrier section. Discretely arranged in the cylindrical shell (6) and fixed by retaining rings (7), the gap between the conical honeycomb pieces (4) is 0.5mm to 2mm, and the cone angle of the conical honeycomb pieces (4) is not less than 45 degrees , the thickness is not more than 5mm, the conical honeycomb sheet (4) has a side with a width of not more than 5mm, and a circular arc transition section at the top of the cone, the direction of the flow channel (5) of the conical honeycomb sheet (4) is in line with the conical surface and The arc surface is vertical.
CNB021374341A 2002-10-15 2002-10-15 Automotive Exhaust Gas Catalyst Based on Spherical Arc Honeycomb Panel Expired - Fee Related CN1177128C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNB021374341A CN1177128C (en) 2002-10-15 2002-10-15 Automotive Exhaust Gas Catalyst Based on Spherical Arc Honeycomb Panel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNB021374341A CN1177128C (en) 2002-10-15 2002-10-15 Automotive Exhaust Gas Catalyst Based on Spherical Arc Honeycomb Panel

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Publication Number Publication Date
CN1403691A CN1403691A (en) 2003-03-19
CN1177128C true CN1177128C (en) 2004-11-24

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Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005009585A1 (en) * 2005-02-28 2006-08-31 Emitec Gesellschaft Für Emissionstechnologie Mbh Looped or coated honeycomb body is made of sheet steel and one part of sheet metal layers on inlet front side or outlet front side comprise recesses which are arranged on edges thereof
DE102012104767A1 (en) 2012-06-01 2013-12-05 Emitec Gesellschaft Für Emissionstechnologie Mbh Conical honeycomb body with obliquely radial channels
CN102926848B (en) * 2012-10-31 2016-01-13 常州市盛发灯泡厂 Outlet pipe
CN104791050A (en) * 2015-03-04 2015-07-22 刘君才 Static mixer type automobile exhaust filtering/silencing device
CN116328484B (en) * 2023-04-13 2024-08-16 陕西赫星节能环保科技有限公司 Organic waste gas treatment system with catalytic combustion structure for workshops

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