| US 7,601,189 B2 | ||
| Filtration method and a filter device for removing impurities from the air of a limited space and an apparatus for removing carbon dioxide from the air of an air-raid shelter | ||
| Markku Lampinen, Espoo (Finland); Tomi Anttila, Helsinki (Finland); and Keijo Rauhala, Turku (Finland) | ||
| Assigned to Oy Hydrocell Ltd., Jarvenpaa (Finland) | ||
| Appl. No. 10/555,993 PCT Filed May 13, 2004, PCT No. PCT/FI2004/000290 § 371(c)(1), (2), (4) Date Nov. 07, 2006, PCT Pub. No. WO2004/101113, PCT Pub. Date Nov. 25, 2004. |
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| Claims priority of application No. 20030717 (FI), filed on May 13, 2003; and application No. 20031207 (FI), filed on Aug. 28, 2003. | ||
| Prior Publication US 2007/0089605 A1, Apr. 26, 2007 | ||
| Int. Cl. B01D 53/02 (2006.01) | ||
| U.S. Cl. 55—385.3 [55/471; 96/130; 96/139; 96/143; 96/144; 96/108; 96/134; 96/135; 96/140; 96/141; 96/142; 422/122; 422/171; 422/173; 423/239.1; 423/244.09; 165/61; 454/158; 95/139; 95/148] | 24 Claims |
| 1. A filtering method for removing impurities from air (24) circulating within a limited space, such as a room, an air raid shelter or a vehicle, according to which filtering method
the air (24) to be filtered containing carbon dioxide and impurities generated within the limited space is passed through a filter (13), whereby at least a portion of the carbon dioxide and impurities in the air is trapped in the filter, and
after the filtering, the filter (13) is regenerated to remove the carbon dioxide and impurities trapped in the filter by passing a gaseous regenerating medium
through the filter,
characterized in that
the filter (13) is a carbon dioxide filter (13) for trapping and removing carbon dioxide and the air (24) to be filtered is passed through the carbon dioxide filter (13), so that at least a portion of the carbon dioxide in the air is trapped in the filter and removed from the air (24), and
after the filtering, the carbon dioxide filter (13) is regenerated by removing the carbon dioxide trapped in the filter by a technique whereby air (24) that, prior to being conducted to the filter, has been heated to a temperature of 50-200° C., is passed through the filter.
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