Oxidizing catalytic converter, tail gas after-treatment system and tail gas after-treatment method

Abstract

The invention relates to an oxidizing catalytic converter, a tail gas after-treatment system and a tail gas after-treatment method. The oxidizing catalytic converter comprises a length adjusting mechanism, a front-end oxidizing catalytic converter body and a rear-end oxidizing catalytic converter body, wherein the front-end oxidizing catalytic converter body comprises a honeycomb-shaped small-hole carrier; the rear-end oxidizing catalytic converter body comprises a honeycomb-shaped pipeline carrier; the honeycomb-shaped pipeline carrier is inserted into the honeycomb-shaped small-hole carrier; and the length adjusting mechanism adjusts the staggered length of the front-end oxidizing catalytic converter body and the rear-end oxidizing catalytic converter body. Compared with the prior art, the oxidizing catalytic converter has the advantages that the staggered length between the front-end oxidizing catalytic converter body and the rear-end oxidizing catalytic converter body is changed through the length adjusting mechanism, length adjustment of the oxidizing catalytic converter is achieved, the length of the oxidizing catalytic converter can be increased or decreased under different working conditions, temperature compensation is carried out, the oxidizing catalytic converter is suitable for tail gas after-treatment systems of different types and different working conditions, and the adaptability to multiple working conditions of the engine is good.

Description

technical field [0001] The invention relates to the field of engine emission control, in particular to an oxidation catalytic converter, an exhaust gas aftertreatment system and an aftertreatment method. Background technique [0002] As the society's awareness of environmental protection continues to increase, the national regulations on exhaust emissions are becoming more and more stringent. It is difficult to meet the requirements of the regulations economically and effectively from the engine alone, so it is necessary to increase the after-treatment system. The engine exhaust after-treatment system is mainly a device used to treat or evolve toxic and harmful substances in the exhaust. The toxic substances in the exhaust mainly include hydrocarbons, carbon monoxide, nitrogen oxides, and particulate matter. [0003] Oxidation catalytic converter DOC is an important part of the aftertreatment system, which can reduce toxic substances such as hydrocarbons and carbon monoxide ...

AI Technical Summary

Problems solved by technology

[0003] The oxidation catalytic converter DOC is an important part of the aftertreatment system, which can reduce the toxic substances hydrocarbons and carbon monoxide in the exhaust gas through various physical and chemical effects, but the traditional oxidation catalytic converter is mostly a fixed size structure

When the real vehicle is running, there will often be a variety of working conditions. Under different working conditions, the exhaust emission status is different, and the exhaust oxidation performance of DOC is also different. The fixed size DOC has poor adaptability to multiple working conditions of the engine, especially Under low temperature and low load conditions, the oxidation performance of DOC is very low. Similarly, it is difficult to match various models

In addition, in the exhaust after-treatment, when the back pressure of the particulate filter DPF is large, it is often necessary to actively regenerate the fuel injection to reduce particulate matter emissions, which will increase additional fuel consumption. The active regeneration of the collector DPF does not play a corresponding auxiliary role

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