| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method for operating an apparatus for purifying a digestive gas designed to improve the recovery ratio of dissolved methane in absorbing water in a vacuum tank even when the amount of the absorbing water is increased by a rise in water temperature of the absorbing water and thereby easily maintain the methane concentration in purified gas constant. <P>SOLUTION: The method for operating the apparatus for purifying the digestive gas equipped with a digestive gas compressor for compressing the digestive gas fed from a digestive tank after removing mist and an absorption column for dissolving carbon dioxide, etc., in the digestive gas compressed with the digestive gas compressor in the absorbing water and removing the carbon dioxide, etc., is carried out as follows. The absorbing water taken out of the absorption column is fed and decompressed to diffuse a gas, which is returned to the digestive gas compressor. The absorbing water after diffusing the gas is drained to the outside of the system. In the method for operating the apparatus for purifying the digestive gas, the internal pressure of a pressure variable tank is decompressed to a lower pressure than the usual set pressure according to a temperature difference between the water temperature and the set temperature when the water temperature of the absorbing water exceeds the preset set temperature. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
