Novel asymmetrical hole-channel structure of filter body of particulate trap

Abstract

The invention discloses a novel asymmetrical hole-channel structure of a filter body of a particulate trap and belongs to the field of purification of internal combustion engine exhaust gas. According to traditional symmetrical hole channels, the pressure drop rising rate is reduced by increasing the number of the hole channels, but an upper limit exists for increase of the number, and therefore it is needed to adopt the asymmetrical hole-channel structure with the gas outlet hole channel volume smaller than the gas inlet hole channel volume to increase the number of gas inlet hole channels, increase the wall face area of the gas inlet hole channels and further reduce the pressure drop rising rate. The novel asymmetrical hole-channel structure is achieved through the following manner that the cross sections of gas outlet hole channels are designed into a long and narrow shape, the wall faces of the gas outlet hole channels are curved faces, the center lines of the cross sections of the gas outlet hole channels define a polygon, the middle portion defined by the hole channel wall faces serve as the gas inlet hole channels, and the asymmetrical hole-channel structure with a large surface-to-volume ratio is formed. The number of the gas inlet hole channels of the filter body structure is increased by nearly once, the effective filtering area is increased by 2.2 times, and the pressure drop rising rate is reduced by 50 %.

Description

technical field [0001] The invention relates to a novel asymmetric pore structure of a filter body of a particle trap, which belongs to the field of post-treatment of exhaust gas of an internal combustion engine. Background technique [0002] Particulate filter is currently the most effective and widely used after-treatment device for particulate matter emission. As particulate matter is trapped on the wall of the hole, the exhaust back pressure will become higher and higher, which will affect the performance of the diesel engine. Therefore, it is necessary to regularly filter particulate matter. However, excessive regeneration frequency will not only increase the cost of aftertreatment, but also shorten the service life of the particle filter. Therefore, reducing the pressure drop rate of the particulate filter has always been the focus of research at home and abroad. The traditional symmetrical wall-flow filter pore structure has the same shape and size as the inlet and ou...

AI Technical Summary

Problems solved by technology

[0002] Particulate filter is currently the most effective and widely used after-treatment device for particulate matter emission. As particulate matter is trapped on the wall of the hole, the exhaust back pressure will become higher and higher, which will affect the performance of the diesel engine. Therefore, it is necessary to regularly filter particulate matter. However, excessive regeneration frequency will not only increase the cost of aftertreatment, but also shorten the service life of the particle filter

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