Wall-flow type catalytic converter based on multiple layers

Abstract

The invention discloses a wall-flow type catalytic converter based on multiple layers. The wall-flow type catalytic converter is characterized in that the catalytic converter comprises an air inlet, an air outlet, an air inlet end baffle, an air outlet end baffle, a shell, an air inlet passage, an air outlet passage; the air inlet end baffle and the air outlet end baffle are located in the shell; a plurality of carrier cores are arranged in the shell in parallel to form a multilayer structure; each layer can contain the multiple carrier cores; the neighboring carrier cores in the same layer are tightly connected, and air current passages are arranged between the carrier cores and the shell and between the carrier cores in different layers; the carrier cores in neighboring layers or the carrier cores in the central layer are fixed together through the front baffle or the rear baffle, so that the front ends or the rear ends of mesopores of all gaps or the carrier cores in the central layer are closed, and front end closing and the rear end closing are arranged in a staggered mode; the carrier cores are provided with passages through which air flows from one neighboring air inlet passage wall to another air inlet passage; the carrier cores are provided with catalyst coatings.

Description

technical field [0001] The invention relates to the technical field of emission pollution control of internal combustion engines, in particular to a catalytic converter based on a multi-layer wall flow type. Background technique [0002] Catalytic converters are currently the main tool to solve the emission control problems of internal combustion engines. The prevention and control of air pollution has always been a worldwide problem that needs to be solved urgently, and one of the main sources of air pollution is transportation pollution, that is, the exhaust emitted by automobiles, trains, ships and airplanes, among which the harmful exhaust emitted by automobiles is the closest to the breathing zone , and can be directly inhaled by humans, and its pollutants are mainly nitrogen oxides (NO x ), hydrocarbons (HC), carbon monoxide (CO) and lead dust, etc. These vehicles are usually driven by internal combustion engines. Fuel combustion produces various pollutants, and befo...

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Problems solved by technology

[0004] However, reducing the pores of the honeycomb holes may cause the airflow velocity at the inlet and outlet ends to be too concentrated, and the contact cross-sectional area between the airflow and the carrier core is too small, which not only brings a large flow resistance, but also causes air in the central area of ​​the carrier. If the speed and temperature are too high, the catalyst in this area is easy to deteriorate and shorten the service life; at the same time, due to the limited contact area, the reaction between the tail gas and the catalyst is not sufficient, which greatly reduces the efficiency of tail gas treatment

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