低碳化学与化工2025，Vol.50Issue(9)：48-56,9.DOI:10.12434/j.issn.2097-2547.20240382
基于分子交换流的气体分离系统热力学分析
Thermodynamic analysis of gas separation system based on molecular exchange flow
摘要
Abstract
To improve the energy utilization efficiency of gas separation processes,a waste heat-driven gas separation system is proposed.This system consists of multiple molecular exchange flow separators arranged in series and connected using Knudsen pumps.Ideal efficiency and thermal energy utilization efficiency were introduced as evaluation indicators for the thermodynamic analysis of the system.The effects of waste heat temperature,target component(the component with the smaller molecular weight in the mixture)concentration(molar fraction)in the product gas and molecular weight ratio of the mixed gas components on the system's performance were investigated.The results show that within the temperature range of 330 K to 360 K,higher thermal chamber temperatures result in higher ideal efficiencies but lower thermal energy utilization efficiencies.At 360 K,the ideal efficiency(0.428)reaches its maximum,which is 2.1%higher than that at 330 K(0.419),while the thermal energy utilization efficiency(0.307)is at its minimum,26.2%lower than that at 330 K(0.416).Within the concentration range of 0.7 to 0.9,higher concentrations of the target component result in higher ideal efficiencies and thermal energy utilization efficiencies.At a concentration of 0.9,the ideal efficiency(0.428)is the highest,33.8%higher than that at a concentration of 0.7(0.320),while the thermal energy utilization efficiency(0.307)is also the highest,40.2%higher than that at a concentration of 0.7(0.219).As the molecular weight ratio of the mixed gas components decreases(He-Ar(10),He-Ne(5),and Ne-Ar(2)),both ideal efficiency and thermal energy utilization efficiency decrease.At a molecular weight ratio of 2,the ideal efficiency(0.098)is the lowest,81.0%lower than that at a ratio of 10(0.518),while the thermal energy utilization efficiency(0.061)is also the lowest,82.0%lower than that at a ratio of 10(0.340).关键词
气体分离/分子交换流/效率/低品位热能/能耗/热力学分析Key words
gas separation/molecular exchange flow/efficiency/low-grade thermal energy/energy consumption/thermodynamic analysis分类
化学化工引用本文复制引用
欧镱雯,曾成,覃睿,卢苇..基于分子交换流的气体分离系统热力学分析[J].低碳化学与化工,2025,50(9):48-56,9.基金项目
国家自然科学基金(52066002) （52066002）
广西自然科学基金(2019GXNSFAA185024). （2019GXNSFAA185024）
