Cyclone particulate filtration for lean burn engines

摘要

Provided is a particulate filtration apparatus for removing combustible and noncombustible particulate matter from a lean burn engine exhaust gas stream containing particulate matter. The apparatus comprises a cyclone body with a roughened surface on the inner walls designed to trap and agglomerate the combustible particulate matter. A catalyst, selected from a selective catalytic reduction catalyst, an ammonia oxidation catalyst, a hydrolysis catalyst, an oxidation catalyst, a three-way catalyst, and combinations thereof can be coated on the roughened surface. Also provided is a system and methods for treating an exhaust gas stream.

主权项

1. A particulate filtration apparatus for removing combustible and noncombustible particulate matter from a lean burn engine exhaust gas stream containing particulate matter, the apparatus comprising:
a cyclone body having an upper portion and a conical section contiguous with the upper portion; an inlet in the upper portion to place the exhaust gas containing particulate matter in flow communication with the upper portion of the cyclone body, the cyclone body having an inner wall providing a surface facing an interior of the cyclone body, wherein the surface of the inner wall is a roughened surface designed to trap and agglomerate the combustible particulate matter on the inner wall, and wherein the roughened surface extends from the upper portion of the cyclone body into the conical section; an outlet in flow communication with and downstream from the cyclone body; a particulate collector adjacent to the conical section of the cyclone body, wherein the combustible particulate matter is forced against the inner wall by centrifugal force and down to the particulate collector; and a particulate matter incinerator to combust the combustible particulate matter trapped on the roughened surface of the inner walls of the inlet or trapped in the particulate collector.