Patent ID: 9149765
Filing Date: 2015-10-06
Classification: B01D,C01B,F23J,Y02E,Y02P

Abstract:
1. A compressor-based impurity removal system for removing impurities in exhaust gas mainly composed of carbon dioxide from an oxyfuel combustor before the exhaust gas is supplied to a carbon dioxide liquefier, comprising a plurality of impurity separators comprising a plurality of compressors for compressing exhaust gas from the oxyfuel combustor stepwisely to a target pressure for supply of the exhaust gas to the carbon dioxide liquefier for liquefaction thereof, and aftercoolers for cooling the exhaust gas from the respective compressors, water condensed by the cooling being discharged as drain, an alkaline agent supply unit for supplying an alkaline agent to an upstream side of the aftercooler in a last one of the impurity separators, the drain containing the alkaline agent having removed the impurities in the exhaust gas being discharged from the aftercooler in the last impurity separator, and a circulation line for supplying the drain from the aftercooler in the last impurity separator to an upstream side of the aftercooler in a first one of the impurity separators.