FLOW REVERSAL IN EXHAUST SYSTEM INCLUDING FILTER

摘要

A process for treating an exhaust gas of a lean-bum reciprocating internal combustion engine comprising the steps of collecting particulate matter (PM) on a first filter (26) and combusting a carbon fraction thereof, periodically reversing the direction of gas flow through the first filter (20) thereby displacing uncombusted PM from the erstwhile upstream side thereof and collecting at least part of the displaced PM on a second filter (34).