Design and optimization of CO2 capture and purification liquefaction system based on residual energy utilization
In order to capture and utilize the CO2 in natural gas and reduce the energy consumption in the process,the natural gas decarbonization process by alcoholamine method and the CO2 purification and liquefaction process were combined,a CO2 capture and purification liquefaction system based on residual energy utilization was proposed,and the flue gas heat of the gas turbine of the refrigeration unit compressor was used in the absorbent regeneration process.The system was simulated by HYSYS software,and the main influence parameters of the decarbonization process by alcoholamine method and the liquefaction process by CO2 purification were analyzed.The results show that the liquefaction rate of CO2 is 86.36%,the recovery rate is 99.5%,and the molar fraction of liquid CO2 is 99.86%.The comprehensive energy consumption of the module unit for decarbonization by alcoholamine process is 11.1414 MW,and the residual energy utilization is 266.2 kW,the comprehensive energy consumption of the module unit for purification of CO2 is 3.7524 MW.The energy consumption of the system is optimized by response surface methodology and genetic algorithm.After optimization the energy consumption of the CO2 removal module is 11.0293 MW,and the CO2 purification and liquefaction module is 2.84103 MW.The system can effectively improve the recovery rate and molar fraction of CO2,and realizing the maximum utilization of energy.
CO2 capturealcoholamine methodenergy consumptionsurplus energy utilizationparameter optimization
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