Method for reducing pressure drop through filters, and filter exhibiting reduced pressure drop
AssigneeMassachusetts Institute of Technology
InventorsAlexander Sappok, Victor Wong
Life of this patent
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Abstract
Methods for generating and applying coatings to filters with porous material in order to reduce large pressure drop increases as material accumulates in a filter, as well as the filter exhibiting reduced and/or more uniform pressure drop. The filter can be a diesel particulate trap for removing particulate matter such as soot from the exhaust of a diesel engine. Porous material such as ash is loaded on the surface of the substrate or filter walls, such as by coating, depositing, distributing or layering the porous material along the channel walls of the filter in an amount effective for minimizing or preventing depth filtration during use of the filter. Efficient filtration at acceptable flow rates is achieved.
Claims19
A method of generating and applying a porous coating to the walls of a filter, wherein said filter traps contaminant material, comprising:
- providing a filter downstream of a combustor;
- introducing hydrocarbons into said combustor;
- forcing the resulting combustion products into said downstream filter, and
- allowing said combustion products to accumulate on said walls of said filter in a predetermined amount.
A method of inhibiting, in a filter having a plurality of longitudinal passageways extending from an inlet end face to an outlet end face and defined by porous walls, depth filtration of particulate matter entrained in a fluid stream, said method comprising loading said porous walls with a porous material in an amount sufficient to cause said particulate matter to form a filter cake on the surfaces of said walls.
A method of generating and loading a filter with a porous material, said filter having a plurality of channels, defined by porous channel walls, comprising:
- combusting soot and allowing the products of that combustion to load onto said channel walls;
- combusting a composition comprising inorganic material and allowing said inorganic material to load onto said channel walls;
- and
- oxidizing the products of said soot combustion.
Dependencies are inferred from the claim text.