Electric heating particle catcher aftertreatment system for diesel engine

Abstract

The invention discloses an electric heating particle catcher aftertreatment system for a diesel engine, belongs to the technical field of diesel engine exhaust aftertreatment, and aims to improve reliability and adaptability of the particle catcher aftertreatment system. The electric heating particle catcher aftertreatment system for the diesel engine is composed of a metal electric heating DOC, an electric heating particle catcher, an engine ECU, a storage battery and an alternating current converter; ceramic carriers of the metal electric heating DOC and the electric heating particle catcherare changed into metal carriers; the metal carriers are connected with the alternating current converter and the storage battery correspondingly, can be connected with 220 V alternating current through the alternating current converter or can be directly powered by the storage battery to realize electrified heating so as to realize regeneration of the electric heating particle catcher, and meanwhile, through electrified heating of the metal electric heating DOC and the electric heating particle catcher, SCR front temperature can be increased, the functions of desulfurization and urea crystalremoval can be achieved, and normal running of a vehicle is ensured after sulfur poisoning or urea crystallization blockage of an aftertreatment device occurs.

Description

technical field [0001] The invention belongs to the technical field of diesel engine exhaust post-treatment, in particular to an electric heating particle catcher (DPF) post-treatment system for a diesel engine. Background technique [0002] Compared with the emission regulations of the National VI and the National IV and V, the limit value of exhaust pollutants (mainly particles and nitrogen oxides) of diesel engines is much lower. It is not possible to reduce the above two exhaust pollutants to meet the requirements of the emission regulations by relying solely on the diesel engine. It is necessary to optimize the combustion inside the engine to reduce the emission of particulate matter and nitrogen oxides, and at the same time use selective catalytic reduction (SCR) outside the engine. The treatment system reduces the nitrogen oxides in the exhaust pollutants. The diesel particulate filter (DPF) post-treatment system is used to filter the particulate matter in the exhaust...

AI Technical Summary

Problems solved by technology

[0005] In the National VI emission stage, with the improvement of conversion efficiency, the injection volume of urea has increased significantly, and the risk of urea crystallization in the SCR system has also increased. Although the mixer can alleviate or even avoid the occurrence of urea crystallization to a certain extent, due to poor quality urea, electrical failures, nozzles, etc. Abnormal injection or long injection of urea caused by jamming, etc., further resulting in urea crystallization is difficult to solve

After crystallization blockage occurs, the mixer needs to be replaced or cleaned, causing serious complaints from users, and this problem needs to be solved urgently

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