| 摘要 |
<p>PURPOSE:To efficiently collect fine particles and to prolong the life of filter by disposing a ceramic skeleton structural body or a ceramic fibrous formation body in the upstream side and a honeycomb type filter in the downstream side of an exhaust gas flow passage. CONSTITUTION:The ceramic skeleton structural body 4 or the ceramic fibrous formation body is disposed in the upstream side of the exhaust gas flow passage of an exhaust gas cleaning device 1, and, in the downstream side is disposed the honeycomb type filter 3 consisting of porous ceramic material provided with through-holes the end parts of which are sealed with plugs 3a, 3b. By this constitution, fine particles are collected by honeycomb type filter 3 as well as by the ceramic skeleton structural body 4 with the result that the collecting efficiency is improved. Moreover, the burnt fine practices which are generated by the regenerating combustion treatment of the honeycomb type filter, etc., are prevented from sticking and accumulating on the partition wall of the honeycomb type filter, so that the life of filter is elongated. When a pressure loss is increased, only the structural body 4 is necessary to be exchanged resulting in the advantage in cost.</p> |
