Exhaust particulate filter

Details Exhaust particulate filter Exhaust particulate filter

1991-04-22

1992-12-15

Nozick, Bernard

Gas separation

With nonliquid cleaning means for separating media

With sequential cleaning of plural units

55466, 55523, 55487, 55DIG30, 60311, B01D 4600

Patent

active

051713373

ABSTRACT:
A filter unit (10) for removing particulates from exhaust gases for example from a diesel engine, includes several filter elements (24) arranged so the gas flows through them are in parallel and that no individual element carries more than a fifth of the total flow. Each element (24) comprises a tubular heating element (50) of high voidage electrically conducting material, with a secondary filter layer (52) adjacent to its upstream surface, and with means (53-63) to ensure the gas flow and particulate deposition are substantially uniform over the upstream surface. At intervals the heating elements (50) are electrically energized, in turn, to burn off deposited particulates. At any one time only a subset of the elements (24) is energized through which at that time no more than a fifth of the total gas flow passes. The unit (10) might have thirteen such elements (24), energized one at a time. Alternatively it might have fewer such elements (24) along with a valve to reduce the flow of gas through the element or elements which are at that time being energized.

REFERENCES:
patent: 4791785 (1988-12-01), Hudson et al.
patent: 4829766 (1989-05-01), Henkel

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