| 摘要 |
<p>PURPOSE:To provide the improved durability of a filter and reduction in electric capacity which is necessary for reproducing the filter by providing protruding parts at the processed gas upstream surface of a perforated plate, making the area of the protruding parts at a particular ratio, and using a perforated plate which is provided with electric conductivity. CONSTITUTION:A perforated plate 1 which is provided with one opening parts 2 of more than one is disposed in serial at a filter. Protruding parts 4 are provided at the processed gas upstream surface of the perforated plate 1. Besides, protruding parts 4 are provided around the openings 2 in the processed gas upstream surface. The area of the protruding parts 4 is made 0.5-2.0% of the area of the perforated plate 1. The perforated plate 1 to be used has electric conductivity. The collecting mechanism of the filter uses the pressure drop which occurs while exhaust gas is flowing out. A part of exhaust gas is made to pass through the perforated plate 1 by the difference in pressure between the front and back of the perforated plate 1 to repeat processing a part of exhaust gas in the perforated plate 1 many times. It is thus possible to improve the durability of the filter and reduce electric cavity which is necessary for reproducing the filter.</p> |
