Thermodynamic analysis of gas separation system based on molecular exchange flow

OU Yiwen; ZENG Cheng; QIN Rui; LU Wei

doi:10.12434/j.issn.2097-2547.20240382

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Thermodynamic analysis of gas separation system based on molecular exchange flow

更新时间：2025-09-26

- Thermodynamic analysis of gas separation system based on molecular exchange flow
- Vol. 50, Issue 9, Pages: 48-56(2025)
- 作者机构：
  
  1.广西大学机械工程学院，广西南宁 530004
  2.中国石化销售股份有限公司广西石油南宁分公司，广西南宁 530023
- 作者简介：
- 基金信息：
- DOI：10.12434/j.issn.2097-2547.20240382
  CLC： TQ028.8
- Received：09 September 2024，
  
  Revised：2024-11-11，
  
  Published：25 September 2025
- 稿件说明：
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欧镱雯,曾成,覃睿等.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(09):48-56.

OU Yiwen,ZENG Cheng,QIN Rui,et al.Thermodynamic analysis of gas separation system based on molecular exchange flow[J].Low-Carbon Chemistry and Chemical Engineering,2025,50(09):48-56.
欧镱雯,曾成,覃睿等.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(09):48-56. DOI： 10.12434/j.issn.2097-2547.20240382.

OU Yiwen,ZENG Cheng,QIN Rui,et al.Thermodynamic analysis of gas separation system based on molecular exchange flow[J].Low-Carbon Chemistry and Chemical Engineering,2025,50(09):48-56. DOI： 10.12434/j.issn.2097-2547.20240382.

摘要

为提高气体分离过程能量利用效率，提出了一种余热驱动的气体分离系统。该系统由多个分子交换流分离器级联排列组成，并采用努森泵进行连接。引入理想效率和热能利用效率作为评价指标，对系统进行了热力学分析，探讨了余热温度、产品气体目标组分（混合气体中分子质量较小的组分）浓度（物质的量分数），以及混合气体组分分子质量比对系统的影响。结果表明，在330~360 K范围内，热腔温度越高，理想效率越高，热能利用效率越低；360 K时理想效率最高（0.428），比330 K时（0.419）提高了2.1%；360 K时热能利用效率最低（0.307），比330 K时（0.416）降低了26.2%。在0.7~0.9浓度范围内，产品气体目标组分浓度越高，理想效率和热能利用效率均越高；浓度为0.9时理想效率最高（0.428），比浓度为0.7时（0.320）提高了33.8%；浓度为0.9时热能利用效率最高（0.307），比浓度为0.7时（0.219）提高了40.2%。混合气体组分分子质量比越小（He-Ar（10）、He-Ne（5）和Ne-Ar（2）），理想效率和热能利用效率均越低；分子质量比为2时理想效率最低（0.098），比分子质量比为10时（0.518）降低了81.0%；分子质量比为2时热能利用效率最低（0.061），比分子质量比为10时（0.340）降低了82.0%。

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

Keywords

references

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