Design and Analysis of CO2 Capture Process Based on Cryogenic Liquefaction Technology
Realizing CO2 emission reduction in industrial production is an arduous challenge and an important technological approach to combating global warming.CO2 capture technology has been developed to a certain extent and the low-temperature liquefaction method is feasible and economical.The paper selects three physical property methods to simulate and analyze the bubble dew point line of the mixture with the process simulation software Aspen Plus,which can simulate the whole process of CO2 separation by low-temperature liquefaction and chooses Peng Robinson equation as the method for this process using the CO2/N2 mixture with high concentration CO2 as well as comparing with the literature data.It analyzes the effects of liquefaction pressure and temperature on the liquefaction rate of mixture and the purity of CO2,determines the optimal liquefaction conditions at the condition of the liquefaction rate of CO2≥90%and purity≥99.5%,optimizes such parameters as cooling medium flow rate,condensation temperature difference,and evaporation temperature to reduce the energy consumption to the maximum extent.The simulation results showed that the liquefaction rate of CO2 can reach 91.80%,the purity of CO2 can reach 99.50%,and the lowest total energy consumption per unit of liquefaction can be 12.22 kW·h/kmol under these optimal conditions,which could provide the theoretical support and technical reference in the technological design and performance optimization of CO2 separation by low-temperature liquefaction.
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