Regenerating catalytic particulate filters and apparatus therefo

Details Regenerating catalytic particulate filters and apparatus therefo Regenerating catalytic particulate filters and apparatus therefo

1983-01-27

1985-04-09

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Methods

60285, 60311, F01N 302

Patent

active

045093270

ABSTRACT:
A method and apparatus for regenerating a catalyzed particulate filter in the exhaust stream of a combustion source (particularly a diesel engine) are provided that do not necessitate excessive heating of the exhaust stream flowing from the combustion source. During regeneration the intake air is supplied in a pulsed manner, preferably but not necessarily, to less than all of the cylinders of the engine so that the combined engine exhaust carries sufficient "fuel", primarily in the form of a carbon monoxide and a hydrocarbon fraction, that will be catalytically oxidized thereby generating an exotherm. Due to the liberation of heat during that carbon monoxide and hydrocarbon oxidation above the light-off temperature of the filter, the particulates stored by the filter will be ignited and burned cleaning and regenerating the filter.

REFERENCES:
patent: 4211075 (1980-07-01), Ludecke
patent: 4380149 (1983-04-01), Ludecke
patent: 4395875 (1983-08-01), Virk
patent: 4404796 (1983-09-01), Wade

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