低碳化学与化工2024，Vol.49Issue(2)：96-104,9.DOI:10.12434/j.issn.2097-2547.20230219
基于LNG冷能的膜-深冷分离碳捕集耦合系统工艺模拟与分析
Process simulation and analysis of membrane-cryogenic separation carbon capture coupling system based on LNG cool energy
摘要
Abstract
Developing an economical,efficient and energy-saving carbon capture process is one of the key research directions in carbon capture,utilization,and storage technology.A coupling system process for carbon capture based on liquefied natural gas(LNG)cold energy was proposed to address low-concentration(volume fraction less than 12%)CO2 flue gas.The process combines membrane separation and cryogenic separation,compensating for the shortcomings of using a single carbon capture technology.It also utilizes the cold energy inherent in LNG,which holds the potential for achieving lower energy consumption in CO2 capture.The process was simulated by Aspen Plus software,and sensitivity analysis was conducted on key parameters affecting system performance,such as liquefaction temperature,compression pressure,and permeate gas CO2 concentration.Experimental research was also carried out to validate the simulation results.The results indicate good consistency between simulation and experimental data,showing that the proposed process can provide liquid CO2 products that meet engineering or commercial application requirements.The carbon capture rate and product purity exhibit an inversely related trend with liquefaction temperature and compression pressure.In other words,as the liquefaction temperature decreases or the compression pressure increases,the carbon capture rate increases while product purity decreases.Under the premise of meeting the process's target requirements(carbon capture rate greater than or equal to 85%,product purity greater than or equal to 90%),the lowest energy consumption for carbon capture in the process is 2.183 MJ/kg(the energy required to capture 1 kg of CO2 is 2.183 MJ).This study provides a novel approach to separate and recover CO2 from low-concentration CO2 flue gas.关键词
碳捕集/膜分离/CO2液化/LNG冷能/耦合工艺Key words
carbon capture/membrane separation/CO2 liquefaction/LNG cooling energy/coupling system分类
化学化工引用本文复制引用
秦锋,陈海平,明红芳,张帆..基于LNG冷能的膜-深冷分离碳捕集耦合系统工艺模拟与分析[J].低碳化学与化工,2024,49(2):96-104,9.基金项目
中海石油气电集团有限责任公司科技项目(QDKY-2021-YFZX-08). （QDKY-2021-YFZX-08）
