Regenerable particulate filter

摘要

An automotive exhaust gas particle filter has inlet and outlet pipes to a housing enclosing a ceramic filter incorporating a number of filter channels with porous walls and electrical heating elements. The ceramic filter is a two-part unit whose main components are separated by a highly porous ceramic disc. The porous disc close to the heating elements which regenerate the filter from time to time. The heating element is supported by a frame. The first part (7) of the ceramic filter is capable of withstanding higher temperatures than the second part (8). The first part (7) is made of silicon carbide while the second (8) is made of cordierite. The ceramic disc (9) is a highly porous ceramic foam, and is up to 40 mm thick. The number of pores is 10-100, preferably 30-60 pores per inch.