Patent ID: 9669353
Date: 2017-06-06
CPC Classifications: B01D,C01B,F04B,F04D

Claim:
1. An apparatus for preventing corrosion of a compressor-based impurity separation mechanism wherein impurities in exhaust gas mainly composed of carbon dioxide from an oxyfuel combustor are removed, before supplying of the exhaust gas to a carbon dioxide liquefier, by the compressor-based impurity separation mechanism comprising a plurality of impurity separators having a plurality of compressors for stepwisely compressing carbon dioxide up to a target pressure for liquefaction thereof and aftercoolers for cooling the exhaust gas compressed by the respective compressors, water condensed by the cooling being discharged as drain, the apparatus comprising an alkalinity control agent supply unit which comprises a nozzle for spraying an alkalinity control agent upstream of a compressor in a first one of the impurity separators such that a detected pH value in the drain from the aftercooler in said first impurity separator is 5 or more to remove impurities containing at least sulfur oxides in the exhaust gas and a supply pump for supplying an alkalinity control agent stored in an supply tank to said nozzle through a filter.