Filter for EGR system heated by an enclosing catalyst

A device for purifying exhaust gases from a combustion engine (1),comprising

• an arrangement (30) for recirculating exhaust gases from the engine to an air intake (2) thereof,
• an exhaust gas purification arrangement (31) adapted to convert constituents in the exhaust gases to less environmentally hazardous substances and a filter arrangement (32) adapted to liberate the exhaust gases from particulate constituents,
• the filter arrangement (32) comprising at least one filter (33) arranged to receive from at least one converter unit (34) of the exhaust gas purification arrangement (31) a heat addition to promote regeneration of the filter by combustion of particulate constituents deposited therein,
• the filter (33) and the converter unit (34) being arranged in at least partly overlapping heat transferring relation as viewed transversely to the direction of exhaust gas flow,
• characterized in that the filter (33) is arranged in a first flow path (37) adapted to recirculate exhaust gases to the air intake (2) of the engine,
• the converter unit (34) is arranged in a second flow path (39), in which exhaust gases flow from the engine (1) to an exhaust gas outlet (9) communicating with the surroundings,
• a mouth (40′) of the first flow path (37′) is located downstream of the converter unit (34′) present in the second flow path (39′),
• said first flow path (37′) containing said filter (33′) comprises a mouth (40′) opening in a direction facing away from incoming exhaust gas flow (36),
• with said first flow path (37′) situated concentrically within said second flow path (39′) comprising said converter unit (34′) which is concentrically situated about said filter (33′), and
• said first flow path (37′) communicates with said recirculating arrangement (30) through a bent pipe (38′) directed obliquely out through a casing (35) containing said exhaust gas purification arrangement (31),
• such that exhaust gases (36) flowing from said combustion engine (1) entirely flow through said converter unit (34′) situated in said second flow path (39′), with a portion of said exiting exhaust gas reversing direction (42) and flowing back into said first flow path (37′) and through said filter (33′).

A device for purifying exhaust gases from a combustion engine (1), comprising

• an arrangement (30) for recirculating exhaust gases from the engine to an air intake (2) thereof,
• an exhaust gas purification arrangement (31) adapted to convert constituents in the exhaust gases to less environmentally hazardous substances and a filter arrangement (32) adapted to liberate the exhaust gases from particulate constituents,
• the filter arrangement comprising at least one filter (33) arranged to receive from at least one converter unit (34) of the exhaust gas purification arrangement (31) a heat addition to promote regeneration of the filter by combustion of particulate constituents deposited therein,
• the filter (33) and the converter unit (34) being arranged in overlapping heat transferring relation as viewed transversely to the direction of exhaust gas flow,
• characterized in that the filter (33) is arranged in a first flow path (37) adapted to recirculate exhaust gases to the air intake (2) of the engine,
• the converter unit (34) is arranged in a second flow path (39), in which exhaust gases flow from the engine (1) to an exhaust gas outlet (9) communicating with the surroundings, and
• said filter (33) in said first flow path (37) back to the engine and said converter unit (34) in said second exhaust flow path (39) are arranged in complete superimposed overlapping relationship adjacent one another in said transverse direction to exhaust gas flow,
• with said filter (33) and converter unit (34) remaining in continuous heat transfer relation as said exhaust gases simultaneously flow through both said first and second flow paths (37, 39).