| abstract |
In the present invention, a simple device is used to remove impurities from a waste gas from an oxygen-combustion device, thereby reducing equipment costs. The present invention is a compressor impurity-removal system that compresses and removes impurities from a primarily-carbon-dioxide waste gas (2) from an oxygen-combustion device (1) before said waste gas (2) is supplied to a carbon-dioxide liquefaction device (3). Said compressor impurity-removal system is provided with a plurality of impurity-separation devices (6a, 6b, 6c) that have the following: a plurality of compressors (4a, 4b, 4c) that incrementally compress the waste gas (2) from the oxygen-combustion device (1) to a target pressure for liquefying carbon dioxide; and aftercoolers (5a, 5b, 5c) that cool the waste gas (2) compressed by the respective compressors (4a, 4b,4c) and extract, via drains, moisture that has condensed due to the cooling. The compressor impurity-removal system is also provided with an alkaline-agent supply device (12) that supplies an alkaline agent (10) upstream of at least the aftercooler (5a) in the first impurity-separation device (6a). The impurities in the waste gas (2) are thus extracted via a drain containing an alkaline agent (10). |