1992-02-01

Study on Regeneration of Diesel Particle Trapper by Electrical Self-Heating Type Filter 920140

The cordierite filter has been widely studied because of it's inherent, high capacities in the collection efficiency and heat-resistance. During the regeneration process of a cordierite filter, failure of ignition or incomplete burning propagation occurs, and additionally melts or cracks develop sometimes.In this study, the problems stated above are considered from a new standpoint, and a regeneration method that does not strictly depend on accumulated soot quantity is discussed. A filter made of SiC (Silicon carbide) possesses the requisite electric resistance and it's possible to heat it uniformly by using electricity. Accumulated soot can be uniformly incinerated not by burning propagation but by simultaneous ignition and burning of all accumulated soot. Silicon carbide has a higher resistance to heat than cordierite. Therefore, a self-heating filter made of SiC makes it possible to regenerate the filter in a wider range of accumulated soot. Additionally, its temperature can be precisely controlled by an electrical system.The feasibility of a particle trapper system equipped with the electrical self-heating filter is examined. Additionally, the fundamental characteristics of heat conduction are analyzed by calculation and regeneration behaviors of the filter are observed experimentally. Tests are also carried out on filters with catalyzers. Test results conclude that this type of filter possesses a lot of merit as compared with traditional filters. It-s feasible that this filter has all the potential required as a particle trapper with a wide regeneration window.

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