二氧化碳捕集耦合工艺设计与优化OA北大核心CSTPCD

The energy consumption of high carbon natural gas increases with the increase of carbon content when it is decarburized by the alcohol amine process.In order to reduce the energy consumption of high carbon natural gas,a carbon dioxide(CO2)capture coupled process(referred to as"coupled process")was proposed,which coupled the alcohol amine process(N-methyldiethanolamine as the absorbent)with inter-stage cooling,liquid rich shingle desorption,acid gas recompression heat pump and steam-mechanical recompression technology(MVR)heat pump processes.The key parameters,such as inter-stage flow cooling temperature,lean liquid throttling pressure,acid gas recompression pressure and regenerator bottom reboiler temperature,were analyzed by Aspen Hysys software,and the key parameters were optimized by response surface analysis and genetic algorithm.The results show that the inter-stage flow cooling temperature,the lean liquid throttling pressure,the acid gas compression pressure and the regenerator bottom reboiler temperature is 58℃,0.0844 MPa,0.195 MPa and 92℃,respectively.Compared with the combined process(membrane separation+alcohol amine method),the energy consumption of the coupled process is significantly reduced,and the unit energy consumption of decarbonization(the energy required to remove 1 t CO2)decreases from 1.338 GJ/t to 1.110 GJ/t.Compared with before optimization,the CO2 content(volume fraction)in the purified gas of coupled process after optimization decreases from 2.533%to 2.326%,and unit energy consumption decreases from 1.110 GJ/t to 1.074 GJ/t.