Comparative analysis and simulation of power cycle to recovery cold energy of LNG

CHEN Yu; JU Yonglin

doi:10.11949/j.issn.0438-1157.20150716

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Comparative analysis and simulation of power cycle to recovery cold energy of LNG

更新时间：2025-12-10

- Comparative analysis and simulation of power cycle to recovery cold energy of LNG
- CIESC Journal Issue S2, Pages: 387-391(2015)
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- DOI：10.11949/j.issn.0438-1157.20150716
  CLC： K01
- Online First：31 August 2015，
  
  Published：31 August 2015
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CHEN Yu, JU Yonglin. Comparative analysis and simulation of power cycle to recovery cold energy of LNG[J]. CIESC Journal, 2015, (S2): 387-391.
DOI：

CHEN Yu, JU Yonglin. Comparative analysis and simulation of power cycle to recovery cold energy of LNG[J]. CIESC Journal, 2015, (S2): 387-391. DOI： 10.11949/j.issn.0438-1157.20150716.

摘要

液化天然气(LNG)在再气化过程中具有巨大的冷能利用价值。目前回收LNG冷能的诸多方法中LNG冷能发电是最有可能大规模利用的方式

同时也是技术较为成熟的方法。在保证天然气入网压力及膨胀机最大承压的条件下

通过HYSYS流程模拟软件对以丙烷为工质的朗肯循环、天然气直接膨胀与朗肯循环相结合的联合循环进行流程模拟

并根据模拟得到的过程参数和输出功进行对比分析

总结了两种循环的特点和发电收益。如果以年蒸发量为150万吨、年工作小时为8000 h的LNG接收站作为分析的基础

并以工业用电价格0.55元·(kW·h)-1计算

联合法的年发电收益将比朗肯循环法多487万元

以此可以作为两种循环流程经济性分析的基础

为流程全面的经济性分析提供可靠的依据。

Abstract

Cold energy utilization of liquefied natural gas(LNG)has tremendous values.Cold energy power generation is the most likely way to be large-scale used among the methods used to reclaim and utilize LNG cold energy.Based on pressure condition required of the natural gas network and the maximum pressure expander could endure

simulation studies of Rankine cycle with Propane as working fluid and combined method are carried out through HYSYS.The combined method is composed of two stage of natural gas direct expansion and the Rankine cycle with Propane as working fluid.The process parameters and the output electric powers are determined.If the annual evaporation is 1.5 million tons

the annual working hours of 8000 hours as a basis for analysis of LNG terminals

and industrial electricity price 0.55 CNY·(kW·h)-1

the combined method of annual generation revenue will be 4.87 million more than Rankine cycle.The values can be used as the basis of economic analysis of two cycles

and also provide a reliable basis for a comprehensive economic analysis of the two processes.

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