Design and optimization of integrated process of light hydrocarbon recovery and air separation driven by LNG cold energy

QU Le; LIU Yuanjie; PAN Jie; TANG Feiran; LI Ran

doi:10.12434/j.issn.2097-2547.20250083

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Design and optimization of integrated process of light hydrocarbon recovery and air separation driven by LNG cold energy

更新时间：2026-04-23

- Design and optimization of integrated process of light hydrocarbon recovery and air separation driven by LNG cold energy
- Vol. 51, Issue 4, Pages: 145-154(2026)
- 作者机构：
  
  1.西安石油大学石油工程学院，陕西西安 710065
  2.西安石油大学西安市致密油（页岩油）开发重点实验室，陕西西安 710065
  3.西安石油大学油气储运安全与节能陕西省高校工程研究中心重点实验室，陕西西安 710065
- 作者简介：
- 基金信息：
- DOI：10.12434/j.issn.2097-2547.20250083
  CLC： TQ028;TE832
- Received：04 March 2025，
  
  Revised：2025-04-24，
  
  Published：25 April 2026
- 稿件说明：
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屈乐,刘元杰,潘杰等.LNG冷能驱动的轻烃回收与空气分离集成工艺设计与优化[J].低碳化学与化工,2026,51(4):145-154.

QU Le,LIU Yuanjie,PAN Jie,et al.Design and optimization of integrated process of light hydrocarbon recovery and air separation driven by LNG cold energy[J].Low-Carbon Chemistry and Chemical Engineering,2026,51(4):145-154.
屈乐,刘元杰,潘杰等.LNG冷能驱动的轻烃回收与空气分离集成工艺设计与优化[J].低碳化学与化工,2026,51(4):145-154. DOI： 10.12434/j.issn.2097-2547.20250083.

QU Le,LIU Yuanjie,PAN Jie,et al.Design and optimization of integrated process of light hydrocarbon recovery and air separation driven by LNG cold energy[J].Low-Carbon Chemistry and Chemical Engineering,2026,51(4):145-154. DOI： 10.12434/j.issn.2097-2547.20250083.

摘要

为提升轻烃回收工艺中乙烷回收率、冷能利用率和㶲效率，并提升液化天然气（LNG）冷能综合利用效能，提出了一种基于LNG冷能驱动的轻烃回收与空气分离集成工艺。以乙烷回收率、系统功耗、冷能利用率、㶲效率和净现值为评价指标，研究了关键参数对系统性能的影响，并开展了多目标优化、㶲分析和经济性（净现值）综合评价。结果表明，脱甲烷塔入口压力和温度、蒸馏塔1入口温度，以及空气质量流量对系统性能具有显著影响；多目标优化后，工艺乙烷回收率为94.79%，系统功耗为4.27 × 10

kW，冷能利用率为88.20%，㶲效率为84.66%，净现值为294.8 × 10

CNY。设备㶲分析表明，压缩机、精馏塔和换热器的㶲损失合计占总损失的85%以上，是提升系统能效的关键环节。新工艺在冷能梯级利用、乙烷回收率和㶲效率方面表现出显著优势，兼具技术可行性与经济竞争力，可为LNG冷能耦合化工分离工艺提供新思路。

Abstract

To improve the ethane recovery rate

cold energy utilization rate and exergy efficiency in light hydrocarbon recovery processes

and to enhance the comprehensive utilization efficiency of LNG cold energy

an integrated process of light hydrocarbon recovery and air separation driven by LNG cold energy was proposed. Using ethane recovery rate

system power consumption

cold energy utilization rate

exergy efficiency and net present value as evaluation indicators

the effects of key parameters on system performance were investigated

along with multi-objective optimization

exergy analysis

and comprehensive economic (net present value) evaluation. The results show that the demethanizer inlet pressure and temperature

the inlet temperature of distillation column 1 and the air mass flow rate have significant impacts on system performance. After multi-objective optimization

the process achieves an ethane recovery rate of 94.79%

a system power consumption of 4.27 × 10

a cold energy utilization rate of 88.20%

an exergy efficiency of 84.66% and a net present value of 294.8 × 10

CNY. Exergy analysis of equipment indicates that the combined exergy losses of compressors

distillation columns and heat exchangers account for more than 85% of the total losses

representing key links for improving system ene

rgy efficiency. The proposed process demonstrates significant advantages in cold energy cascade utilization

ethane recovery and exergy efficiency

while exhibiting both technical feasibility and economic competitiveness

thus can provide a new approach for coupling LNG cold energy with chemical separation processes.

关键词

Keywords

references

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