| 摘要 |
PURPOSE: To obtain a high-efficiency filter for gaseous fluid by using a freeze- dried or lyophilized and then compressed porous filter element. CONSTITUTION: A freeze-dried or lyophilized and then compressed porous filter element, e.g. a filter element 1 consisting of a freezed, freeze-dried, compressed and dried porous solid material, is used. The filter consisting of the element 1 is arranged between the two perforated plates 5 and 6 between the inlet duct 2 and outlet duct 3 for a gaseous fluid to be filtered, and filtration is conducted. The material forming the filter element is exactly suitable to filter off the grains of the micron or submicron order carried by the gaseous fluid, namely suitable to filter off the grains having 0.01 to 5μm.
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