Abstract
In this paper, the model of low temperature fractionation CO2 capturing process is established with HYSYS to carry out the simulation of the process. According to the simulation results, it is concluded that as the CO2 content in the feed gas raises, the CO2 product purity increases and the cooling energy cost of the system decreases. As the CO2 product purity rises, the cooling energy cost increases more and more rapidly. According to the 91.0% CO2 content feed gas, the optimized fractionation pressure is 3.1MPa and the corresponding liquefaction temperature and condensing temperature is-20°C and-24°C respectively.
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