A FILTER ASSEMBLY FOR TREATMENT OF A GLAS FLOW, AND A PARTICULATE FILTER

摘要

The present invention relates to a filter assembly (1; 1') for treatment of a gas flow and comprising: a particulate filter (4; 4'') having an inlet end face (4a; 4a'; 4''), an outlet end face (4b; 4b'; 4b''), a peripheral wall (4c) and a honeycomb wall structure (10) at least partly of porous ceramic material defining a plurality of channels (9) extending from said inlet end face (4a; 4a';4'') to said outlet end face (4b; 4b';4b''), wherein said wall structure (10) is adapted for accumulating particulate matter during passage of said gas flow between said channels (9), an inlet (2) for feeding said gas flow to said inlet end face (4a; 4a'; 4a''), an outlet (8) for discharging said gas flow after passing through said particulate filter (4; 4''), and a housing (3; 3'') accommodating said particulate filter (4; 4'') and defining a passage (5; 5'') from said particulate filter (4) to said outlet (8). According to the invention, an ash collecting unit (7;7'') is arranged for accumulating ash particles (11) in said gas flow, said particulate filter (4;4'') being provided with means (10, 12) for guiding said gas flow towards said ash collecting unit (7; 7'') and for guiding said gas flow towards said passage (5; 5''). The invention also relates to a particulate filter (4; 4'') for such treatment of a gas flow. By means of the invention, an improved filter for purifying for example a diesel engine exhaust gas flow is obtained.