煤炭转化2026，Vol.49Issue(3)：48-56,9.DOI:10.19726/j.cnki.ebcc.202603005
常温高压液化分离CO2-N2二元气体的实验研究
Experimental study on liquefaction separation of CO2-N2 binary gas at ambient temperature and high pressure
摘要
Abstract
Carbon emissions from coal mining and utilization are the main cause of greenhouse effect.In order to reduce CO2 emissions and achieve the goal of carbon neutrality,an integrated approach combining in-situ coal pyrolysis mining with CO2 capture,utilization,and storage(CCUS)technology has been proposed.To address the separation of CO ₂ from high-temperature and high-pressure products generated during in-situ coal pyrolysis,and to further optimize CCUS technology,it is necessary to conduct in-depth investigations into the properties of CO2.However,experimental studies on the properties of CO2 in multicomponent mixture systems under ambient-temperature and high-pressure conditions remain limited.To investigate the behavior of CO2 in multicomponent mixture systems under ambient-temperature and high-pressure conditions,CO2 liquefaction experiments and CO2 solubility experiments were conducted in the laboratory.The dissolution and liquefaction characteristics of CO2 in the CO2-N2 binary mixture system at 287.15 K were obtained under different pressures,with initial CO2 molar fraction of 30%,40%,50%,and 60%,respectively.The results show that,at 287.15 K and within the pressure range of 5 MPa to 9 MPa,before reaching the critical pressure of CO2,higher system pressure leads to enhanced CO2 liquefaction,and the higher the initial molar fraction of CO2 in the system,the better the liquefaction effect.For the gas mixture with an initial CO ₂ molar fraction of 60%at 7.25 MPa,the CO2 molar fraction can be reduced to 38.25%.When the pressure exceeds 7.38 MPa at 287.15 K,CO2 can transform from the liquid phase into the dense phase,and the solubility of CO2 will suddenly increase from 13.38%to 18.45%.关键词
液相CO2/密相CO2/二元混合气体/液化效果/溶解力Key words
liquid phase CO2/dense phase CO2/binary gas mixtures/liquefaction effect/solubility分类
化学化工引用本文复制引用
宋亦辰,刘龙昊,冯增朝,石建行..常温高压液化分离CO2-N2二元气体的实验研究[J].煤炭转化,2026,49(3):48-56,9.基金项目
国家自然科学基金项目(52474106) （52474106）
