| abstract |
Device for removing acidic and injurious gases such as a sulphur dioxide gas and a hydrogen sulfide gas or acid mist from the air comprising a plurality of absorption plates, spacing means positioned for maintaining the absorption plates apart to form a plurality of layers so as to pass air through the space between said layers. The absorption plates are hygroscopic and made of a material such as paper, asbestos paper, cloth or unwoven textile which is impregnated with an alkaline substance selected from the hydroxides and carbonates of alkali metals and alkaline earth metals such as potassium, sodium and calcium, and a hygroscopic wetting agent such as glycerine, ethylene glycol and propylene glycol so that the acidic and injurious gases or the acidic mist are neutralized by said alkaline substance. The device also comprises a plurality of such absorption plates and interposition plates. The interposition plates are interposed in the space between said absorption plates so as to guide two directional flows of air alternately into said space. As a further embodiment, the device comprises a plurality of said absorption plates and a heat-exchange element placed on the air-inlet side of said absorption plates. The heat-exchange element comprises a plurality of partition plates, and spacing means positioned for maintaining the partition plates apart, to form a plurality of layers so as to guide two directional flows of air alternately into the space between said layers. The interposition plates and the partition plates are made of the same material as used in the absorption plates. |