To provide a biogas refining method which dispenses with the installation of a large-sized low pressure gas holder, can achieve the space saving and cost reduction of biogas refining equipment as a whole and can stably take a biogas out of an anaerobic fermentation tank.
In the biogas refining method, the biogas is generated by anaerobically fermenting organic waste in the anaerobic fermentation tank, the biogas from the anaerobic fermentation tank is raised in pressure by a gas compressor 402 to be sent to an absorbing column, the biogas is brought into contact with water in the absorbing column in a high pressure state, carbon dioxide and sulferous impurities contained in the biogas are dissolved in high pressure water to be separated from the biogas to obtain a refined gas with highly concentrated methane, the gas pressure in the anaerobic fermentation tank is measured at this time and the number of rotations of the gas compressor is controlled from the measuring result to be increased and decreased so that the gas pressure in the anaerobic fermentation tank becomes a predetermined almost constant set value.
COPYRIGHT: (C)2006,JPO&NCIPI
Kazuaki Muratani
Yuko Tanaka
Shuichi Kiyama
Hiroshi Miyamoto
Tadashi Koyama
Matsumoto Katsuo
Tomohiro Maruyama
Shiro Toyohisa
Shinko Environmental Solution Co., Ltd.
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