In this paper, the influence of absorber pressure, flash tank temperature, tail gas treatment capacity, K2CO3 solution concentration, activator concentration and other factors on CO2 content in the decarburized purified gas during the operation of tail gas decarburization unit of 4 million T / a coal to oil project of Shenhua Ningxia Coal Group Co., Ltd. is investigated, and the optimized operation conditions for reducing CO2 content in the purified gas are proposed.<br>
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