CERAMIC PARTIAL WALL-FLOW FILTER WITH LOW DEEP BED

摘要

A partial wall-flow filter, having a honeycomb structure including an inlet end, an outlet end, and parallel channels disposed and configured to flow fluid from the inlet end to the outlet end. The channels are defined by a plurality of intersecting porous walls. The partial wall-flow filter has a filtration region of channels plugged at the outlet end and a bypass region of unplugged channels. An N/S ratio of the filter material is less than or equal to about 0.5, less than or equal to about 0.3, less than or equal to about 0.1, or even 0, where N is a pressure drop difference induced by deep bed soot and S is a pressure drop change from 0 grams per liter (g/l) to about 5 g/l for a conditioned curve induced by cake bed soot, where N and S are measured on a full wall-flow filter of the filter material.

主权项

1. A partial wall-flow filter, comprising:
a honeycomb structure comprising an inlet end, an outlet end, and a plurality of parallel channels disposed and configured to flow fluid from the inlet end to the outlet end, the channels being defined by a plurality of porous walls; at least one filtration region and at least one bypass region, wherein the filtration region comprises a channel plugged at the outlet end, and the bypass region comprises an unplugged channel; and an N/S ratio of the filter material is less than or equal to about 0.5, wherein N is a pressure drop difference of the filter material in a full wall-flow filter induced by deep bed soot and S is a pressure drop change of the filter material in a full wall-flow filter from 0 grams per liter (g/L) to about 5 g/L for a conditioned curve induced by cake bed soot.