RECOVERY METHOD FOR SEPARATING CARBON DIOXIDE FROM WASTE COMBUSTION GAS

摘要

PURPOSE:To provide a recovery method for separating carbon dioxide as liquefied one from waste combustion gas contg. moisture and carbon dioxide with a simple system and low power. CONSTITUTION:A method where carbon dioxide is liquefied to separate and recover it from waste combustion gas contg. moisture and carbon dioxide consists of a process where the waste combustion gas is dehumidified by a PSA dehumidifier 21 to make it into dry gas, a process where the dry gas is given volume reducing and concentration by a carbon dioxide concentrator 23 to make it into gas of high carbon dioxide concentration and a process where the gas of high carbon dioxide concentration is given condensation liquefaction by a carbon dioxide liquefying device 31 to get liquefied carbon dioxide. And inert gas discharged from the carbon dioxide liquefying device 31 is returned to a column existing in the regeneration process of the dehumidifier 21 and further the desorbed waste gas from the dehumidifier 21 is rid of moisture by a moisture condenser 39 and returned as dry gas to the inlet of the dehumidifier 21.