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Spherical honeycomb board-based automobile tail gas catalyzing unit

A technology for automobile exhaust and honeycomb panels, which is used in exhaust devices, machines/engines, air quality improvement, etc., can solve the problems of uneven distribution of flow velocity, difficult to withstand long-term impact of exhaust gas, troublesome fixing of porous baffles, etc. Convenience, reduced installation space requirements, reliable connection and effect

Inactive Publication Date: 2003-03-19
SHANGHAI JIAO TONG UNIV
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  • Description
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AI Technical Summary

Problems solved by technology

At present, a circular baffle is added in the middle of the extension section. Through numerical simulation of the flow field of the system, it is found that a recirculation zone appears behind the baffle, and most of the exhaust gas flows towards the outside of the catalyst carrier, and the flow velocity distribution is even more uneven.
In order to eliminate the backflow area behind the baffle, the inventors used a porous baffle to carry out numerical simulation. Compared with the situation without a porous baffle, the flow uniformity was greatly improved, but the fixing of the porous baffle suspended in the air was very difficult. Troublesome and difficult to withstand the long-term impact of exhaust gas

Method used

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  • Spherical honeycomb board-based automobile tail gas catalyzing unit
  • Spherical honeycomb board-based automobile tail gas catalyzing unit
  • Spherical honeycomb board-based automobile tail gas catalyzing unit

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Embodiment Construction

[0020] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.

[0021] Such as figure 1 As shown, the present invention is mainly applied to automobile exhaust catalytic converters of gasoline engines, including an expansion section 1 and a main carrier section of the catalytic converter, a porous spherical arc honeycomb panel 2 is arranged on the inlet surface of the expansion section 1, the shell of the expansion section 1 and the spherical arc The honeycomb panel 2 and the exhaust pipe 8 are fixed by welding or flange connection. The spherical arc honeycomb panel 2 is densely covered with flow channels 3 perpendicular to the surface of the spherical arc, with substantially equal wall thickness and a diameter of 1mm. The wall surface of the runner 3 is coated with platinum, rhodium and other noble metal active layers. The main carrier section of the catalytic converter is composed of about 20 conical h...

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Abstract

The automobile tail gas catalyzing unit includes an expanding section and a main carrier section. The expanding section is provided with porous spherical honeycomb board in the inlet plane fixed to the conic casing and tail gas tube and the spherical honeycomb board has dense flow channels with maximum angle to the axis being the expanding angle of the said section. The main carrier section consists of conic honeycomb sheets arranged discretely with flow channel direction perpendicular to the surface. The present invention may be used in gasoline engine catalyzing device and diesel engine catalyzing device and can homogenize tail gas flow rate, raise mass transfer rate, reduce the radius of the catalyzing device and reduce the harmful exhaust.

Description

Technical field: [0001] The invention relates to an automobile exhaust catalyst, in particular to an automobile exhaust catalyst based on a spherical arc honeycomb plate, which mainly solves the flow velocity optimization problem of the extension section and the main carrier section of the catalyst in the tail gas catalytic reaction system of a gasoline engine and a diesel engine. Background technique: [0002] The flow velocity distribution of the catalytic converter has an important influence on the volume utilization efficiency, catalytic conversion efficiency and service life. Usually, the catalytic converter is a honeycomb body pressed by high-temperature resistant ceramic or alloy materials. The porous active layer containing precious metal platinum, rhodium, etc. is coated on the wall surface of the tiny flow channel in the honeycomb body. When hydrocarbons flow through the micro-element flow channel, they undergo chemical reactions on the active coating through mass ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/28
CPCY02A50/20
Inventor 吴国江黄震张武高
Owner SHANGHAI JIAO TONG UNIV
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