Diesel engine exhaust particulate matter trap and trapping method thereof

Abstract

The invention discloses a diesel engine exhaust particulate matter trap and a trapping method thereof. The trap comprises a trap shell and a particulate trapping device, wherein the trap shell allows engine tail gas to pass through, the particulate trapping device is packaged in the trap shell, the trap shell is a double-layer shell, the particulate trapping device is a filter element with a plurality of radial holes, the double-layer shell comprises an outer shell body, an inner shell body fixed to the inner side wall of the outer shell body and a plurality of opposite punching holes which are arranged in a pairwise opposite mode and used for enabling exhaust airflow to conduct radial opposite punching and collision to generate the coagulation effect, and the opposite punching holes are formed in the side wall of the inner shell body. According to the trap, a shell of an original trap is replaced by a double-layer shell of a radial hedging structure, the flowing direction of exhaust airflow is changed, and radial hedging occurs in the filter element after airflow flowing axially is divided, so that the airflow speed can be reduced, the residence time of two-phase airflow in the trap is prolonged, the contact between the exhaust airflow and a filter device is increased, and the trapping efficiency of the trap can be further improved.

Description

technical field [0001] The invention relates to the technical field of tail gas purification, in particular to a diesel engine exhaust particulate matter collector and a collecting method thereof. Background technique [0002] Diesel engine exhaust particulate matter is the main contributor to atmospheric particulate matter pollution. With the introduction of the National VI emission standard, the emission requirements for diesel engines are getting higher and higher. The current solution is to add a particulate filter to filter the exhaust particles through the oil-coated rare metal filter element, which can achieve better results, but the filter element of the filter has a small pore size (10um ~ 15um), which will cause the diesel engine to be heavier. The large power loss weakens the advantage of the high horsepower of the diesel engine. [0003] The basic structure of the traditional trapping device is as follows: figure 1 As shown, the exhaust air enters from the air ...

AI Technical Summary

Problems solved by technology

Utilizing this structure can also increase the pore diameter of the filter element on the premise of satisfying the trapping effect, thereby reducing the exhaust back pressure caused by the trap to the diesel engine and reducing the engine power loss, so as to solve the existing problem of single axial flow. The problem of low trapping efficiency

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