Diesel particulate filter, combustible contaminant, non-combustible contaminant, filter pressure drop, carrier liquid, filter regeneration, diesel engine, deep-bed filtration, cake filtration, inorganic material
Diesel particulate filter applications
Filter regeneration (burning off the accumulated soot) incurs a fuel economy penalty, and there is a need to reduce filter pressure drop and extend filter regeneration intervals.
This invention describes a novel method and apparatus for reducing filter pressure drop as material accumulates in the filter. This is accomplished by distributing a thin layer of porous material along the channel walls. The thin layer of porous material acts as a physical barrier preventing contaminant material from entering the filter pores, and preventing filter depth contamination. The formation of the porous layer is critical to minimize contaminants, particularly combustible and non-combustible contaminants, from entering the porous material when placed into actual use. With the porous layer in place, the contaminant material immediately forms a filter cake on top of the filter walls. The cake filtration process is characterized by a gradual increase in filter pressure drop as material accumulates on the filter walls.
U.S. Patent Application Number 12/756602, filed on April 8, 2010
Last revised:April 29, 2013
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