Removal of particulate material from a gas

Details Removal of particulate material from a gas Removal of particulate material from a gas

1987-02-27

1988-12-20

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

By means producing a chemical reaction of a component of the...

55466, 55523, 55DIG30, 60311, F01N 302

Patent

active

047917857

ABSTRACT:
Filtering apparatus for removing combustible particles from a gas, e.g. carbon and hydrocarbon particles from the exhaust gases of a diesel engine, comprises at least one filter element which is made of fibrous material and is electrically conductive. To remove trapped particles from the filter element and thereby regenerate the filter element, electrical power is supplied to the filter element to heat it to the point at which the carbon and hydrocarbon particles combust. One or a plurality of such filter elements may be provided in a housing in the exhaust gas system of a diesel engine with the filter elements exposed in parallel to exhaust gases. For regeneration, all filter elements may be simultaneously regenerated while exhaust gases are either exhausted direct to the air or through a similar filtering apparatus. Alternatively the filter elements may be regenerated sequentially so that at least some of the filter elements are always effective as filters. During regeneration exhaust gases are substantially excluded from a filter element undergoing regeneration and this may be effected by preventing flow of the exhaust gases to the filter element while it is being regenerated or by increasing the pressure downstream of the filter element to prevent exhaust flowing through the filter element. Each filter element is preferably annular and arranged so that exhaust gases flow through the wall in a radially inward direction.

REFERENCES:
patent: 4281512 (1981-08-01), Mills
patent: 4345431 (1982-08-01), Suzuki
patent: 4404795 (1983-09-01), Oishi
patent: 4485621 (1984-12-01), Wong
patent: 4535589 (1985-08-01), Yoshida
patent: 4558565 (1985-12-01), Kojima et al.

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