Catalytic conversion device and automobile exhaust system

Abstract

Disclosed is a catalytic conversion device. The catalytic conversion device comprises a housing and at least two filter screen frames. One end of the housing is provided with an air inlet, and the other end of the housing is provided with an air outlet; the filter screen frames are connected to the inner wall of the housing and arranged at intervals in the axial direction of the housing; every filter screen frame is provided with a first end and a second end, wherein the first end is connected to the inner wall of the housing and the second end is arranged at an interval from the inner wall of the housing; the mounting positions of the first ends of every two neighboring filter screen frames are staggered in the circumferential direction of the housing. The automobile exhaust system comprises the catalytic conversion device. When automobile exhaust passes through the filter screen frames, due to the fact that the second ends of the filter screen frames are arranged at an interval from the inner wall of the housing, the flow resistance of the automobile exhaust passing through the catalytic conversion device and the automobile exhaust system can be reduced.

Description

technical field [0001] The invention relates to the field of automobile tail gas treatment, in particular to a catalytic conversion device and an automobile exhaust system. Background technique [0002] The catalytic conversion device is the most important external purification device installed in the automobile exhaust system. It can remove CO, HC and NO from the exhaust gas of the automobile. x Harmful gases such as carbon dioxide, water and nitrogen are converted into harmless carbon dioxide, water and nitrogen through oxidation and reduction. When the high-temperature automobile exhaust gas passes through the purification device, the purification agent in the three-way catalytic converter will enhance CO, HC and NO x The activity of the three gases promotes a certain oxidation-reduction chemical reaction, in which CO is oxidized at high temperature to become colorless, non-toxic carbon dioxide gas; HC compound is oxidized to water (H 2 O) and carbon dioxide; NO x Redu...

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Problems solved by technology

The disadvantages of this kind of catalytic filter are: first, the air resistance of automobile exhaust is relatively large during the passage of automobile exhaust, which is not conducive to the passage of automobile exhaust; second, the carbon smoke emitted by the engine will adhere to the surface of the catalyst and affect the catalyst activity. Affect the catalytic conversion of the catalytic filter; when the car works at low temperature for a long time, the three-way catalytic converter cannot be started, and the carbon smoke emitted by the engine will adhere to the surface of the catalyst, making it impossible to contact with CO and HC. The pores of the catalyst are blocked, which affects the conversion efficiency of the catalyst.

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