双压力等级内外压缩空分变工况热力学与经济性分析

李嘉睿; 李瑞凡; 许宏宇; 许诚

doi:10.11949/0438-1157.20260506

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双压力等级内外压缩空分变工况热力学与经济性分析

热力学 | 更新时间：2026-06-18

- 双压力等级内外压缩空分变工况热力学与经济性分析
- Thermodynamic and economic analysis of dual-pressure internal and external compression air separation units under variable operating conditions
- 化工学报 2026年
- 作者机构：
  
  新能源电力系统全国重点实验室，华北电力大学，北京 102206
- 作者简介：
  
  李嘉睿（2002—），男，硕士研究生，120242202219@ncepu.edu.cn
  许诚（1987—），男，教授，xucheng@ncepu.edu.cn
- 基金信息：
  
  国家重点研发计划项目(2023YFB4102400);国家自然科学基金项目(52422601)
- DOI：10.11949/0438-1157.20260506
  中图分类号： TQ 116.11
- 收稿：2026-04-13，
  
  修回：2026-06-17，
  
  录用：2026-06-18，
- 稿件说明：
移动端阅览
李嘉睿, 李瑞凡, 许宏宇, 等. 双压力等级内外压缩空分变工况热力学与经济性分析[J/OL]. 化工学报, 2026.

LI Jiarui, LI Ruifan, XU Hongyu, et al. Thermodynamic and economic analysis of dual-pressure internal and external compression air separation units under variable operating conditions[J/OL]. CIESC Journal, 2026.
李嘉睿, 李瑞凡, 许宏宇, 等. 双压力等级内外压缩空分变工况热力学与经济性分析[J/OL]. 化工学报, 2026. DOI： 10.11949/0438-1157.20260506.

LI Jiarui, LI Ruifan, XU Hongyu, et al. Thermodynamic and economic analysis of dual-pressure internal and external compression air separation units under variable operating conditions[J/OL]. CIESC Journal, 2026. DOI： 10.11949/0438-1157.20260506.

摘要

为支撑可再生能源电力并网需求，煤基半闭式CO

循环发电系统需长时间偏离设计工况运行，作为系统主要能耗来源，空分的变工况性能对发电系统宽负荷高效运行至关重要。构建了可同时生产6.6 MPa与33.4 MPa氧气的空分系统变工况模型，提出滑压运行的变工况策略，探究了内、外压缩空分在不同工况下的热力学性能及技术经济性。结果表明，在100%~80%负荷运行范围内，相较于内压缩空分，外压缩空分的单位制氧能耗降低了6.70%~8.52%，初期投资成本高3.02%，产品平准化成本低5.54%。外压缩空分在运行成本和变工况效能方面更具优势，内压缩空分则在高压安全性与初期投资方面占优，在工程应用中应根据具体需求综合权衡后合理选型。

Abstract

In order to meet the grid integration requirement for renewable energy

coal-fueled semi-closed CO

cycle power generation system is required to operate under off-design conditions for extended periods. As the primary energy consumption component within the system

the off-design performance of air separation unit (ASU) is critical for the efficient operation of the power generation system over a wide load range. This paper proposes the off-design model for the ASU capable of simultaneously producing oxygen at two pressure levels: 6.6 MPa and 33.4 MPa. Based on sliding pressure control strategies

this study investigates the thermodynamic performance and techno-economic viability of two ASU configurations

internal compression (IC) and external compression (EC)

under variable operating conditions. The results indicate that within the load range of 100% to 80%

the EC model achieves a reduction in the specific energy consumption of 6.70% to 8.52%

has a 3.02% higher initial investment c

ost

and lowers the levelized cost of product by 5.54% compared to the IC model. The EC model has advantages in operating cost and off-design performance

while the IC model has better performance in terms of high-pressure safety and initial investment. Therefore

the appropriate model should be selected with careful consideration based on specific requirements in engineering applications.

关键词

Keywords

references

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