Diesel engine exhaust particulate matter trapping device and control method thereof

Abstract

The invention discloses a diesel engine tail gas particle trapping device which comprises a first shell, a second shell, a baffle, a filter element, a gas inlet pipe, a first exhaust pipe and an ash discharge pipe. The filter element is the wall-flow type honeycomb ceramic filter element, pore passages are in a cone frustum shape, the large ends and the small ends of the pore passages are alternately arranged, the cross section area of the large ends is 1.6-1.8 times that of the small ends, the small ends are closed, the large ends are not closed, and 16 pores are formed in per square centimeter according to the pore passage density. The second shell is driven by a motor to rotate, and the rotation direction is the same as the rotation direction of tail gas of the gas inlet pipe in the first shell. The invention further discloses a control method of the diesel engine tail gas particle trapping device. The diesel engine tail gas particle trapping device has the advantages of being high in trapping efficiency, long in service life, low in regeneration energy consumption, capable of removing ash conveniently and the like.

Description

technical field [0001] The invention relates to the technical field of diesel vehicle tail gas treatment. More specifically, the present invention relates to a diesel engine exhaust particulate matter collection device and a control method thereof. Background technique [0002] In order to meet the increasingly stringent emission control targets, diesel vehicle exhaust after-treatment technology, as an important part of diesel engine emission control system, has attracted more and more attention. Particulate matter trap technology is considered to be the most direct and effective way to purify diesel engine particulate matter at present, and it is also one of the internationally commercialized diesel engine particulate post-treatment technologies. The existing particulate filter can filter most of the particles in the exhaust gas, and its particle capture efficiency is generally 70-90%. Increase, when the exhaust back pressure exceeds a certain value, the work of the diese...

AI Technical Summary

Problems solved by technology

The existing particulate filter can filter most of the particles in the exhaust gas, and its particle capture efficiency is generally 70-90%. Increase, when the exhaust back pressure exceeds a certain value, the work of the diesel engine begins to deteriorate significantly, resulting in a decrease in engine power and economic performance, and the deposited particles must be removed in time to make the particle filter work normally, that is, the particle filter regeneration

The regeneration of the existing particulate filter is usually achieved by directly heating and burning the particles in the filter through an external heat source, which has problems such as large thermal stress on the filter body (filter element), short service life, and high energy consumption for regeneration. In addition, combustion Regeneration can only burn off the carbon particles inside the particle filter, but the ash trapped inside the particle filter cannot be burned and removed. It will accumulate in the particle filter and cause the pressure difference between the front and rear of the particle filter to rise, thereby affecting The working life of the particle filter requires manual cleaning of the particle filter. The general cleaning method is to disassemble the particle filter and clean the ash inside the particle filter by high-pressure gas blowback or water cleaning. drop, very inconvenient

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