| 摘要 |
PCT No. PCT/SE92/00883 Sec. 371 Date Sep. 2, 1994 Sec. 102(e) Date Sep. 2, 1994 PCT Filed Dec. 18, 1992 PCT Pub. No. WO93/11857 PCT Pub. Date Jun. 24, 1993This invention relates to a method of purifying gases which are polluted by hydrocarbons and the like in an apparatus having two reactors. Each reactor contains a catalyst bed, a ceramic bed and a border layer located between the two beds. The polluted gas is forced to stream alternately through the first reactor and the second reactor (clock-wise streaming) and the second reactor and the first reactor, respectively (counter clock-wise streaming). The purification of said gas occurs when the hydrocarbons in the gas are oxidized to carbon dioxide and water in the catalyst beds. The temperature of the gas streaming through the upper portion of the reactors is measured. When the temperature exceeds a certain level, a portion of the gas is taken out from the apparatus during the passage over the border layer of the second reactor if said gas is streaming in a clock-wise direction, and a portion of said gas is taken out from the apparatus during the passage over the border layer of the first reactor if said gas is streaming in a counter clock-wise direction. |
