辽宁石油化工大学学报 ›› 2025, Vol. 45 ›› Issue (5): 73-80.DOI: 10.12422/j.issn.1672-6952.2025.05.009

• 石油与天然气工程 • 上一篇    下一篇

基于LNG冷能的双闪蒸联合循环系统热经济分析

张忠睿1(), 姜媛媛1, 曹英举2, 陈旭阳1, 王长顺3, 姜文全1()   

  1. 1.辽宁石油化工大学 机械工程学院,辽宁 抚顺 113001
    2.大连船舶重工集团装备制造有限公司,辽宁 大连 116083
    3.辽宁石油化工大学 石油天然气工程学院,辽宁 抚顺 113001
  • 收稿日期:2025-01-10 修回日期:2025-03-22 出版日期:2025-10-25 发布日期:2025-10-20
  • 通讯作者: 姜文全
  • 作者简介:张忠睿(2000⁃),男,硕士研究生,从事LNG冷能综合利用方面的研究;E⁃mail:Zzr20000612@126.com
  • 基金资助:
    辽宁省教育厅基本科研项目(LJKMZ20220725)

Thermo⁃Economic Analysis of Dual⁃Flash Combined Cycle System Using LNG Cold Energy

Zhongrui ZHANG1(), Yuanyuan JIANG1, Yingju CAO2, Xuyang CHEN1, Changshun WANG3, Wenquan JIANG1()   

  1. 1.School of Mechanical Engineering,Liaoning Petrochemical University,Fushun Liaoning 113001,China
    2.Dalin Shipbuilding Induetry Equipment Manufacturing Co. ,Ltd. ,Dalian Liaoning 116083,China
    3.College of Petroleum Engineering,Liaoning Petrochemical University,Fushun Liaoning 113001,China
  • Received:2025-01-10 Revised:2025-03-22 Published:2025-10-25 Online:2025-10-20
  • Contact: Wenquan JIANG

摘要:

针对以天然气为燃料的固体氧化物燃料电池余热回收与液化天然气冷能利用相结合以及烟气中CO2的捕集问题,提出了一种由双重再压缩布雷顿循环、CO2回热朗肯循环和双级闪蒸循环构成的新型冷热电联供系统;采用热力学仿真软件对该循环系统进行模拟,分析了混合工质中Xe质量分数、CO2回热朗肯循环膨胀机入口压力p23、闪蒸循环的泵出口压力p26和分流比x对系统热效率、?效率、净输出功和冷?回收率的影响。结果表明,提高p23有利于提升系统的热效率、?效率和净输出功;降低p26有利于提升系统的净输出功及热效率,提高Xe质量分数与分流比x可提升系统的循环净功、热效率与?效率;当Xe质量分数为0.3、p23为16 MPa、p26为13.5 MPa时,系统的热效率、?效率、净输出功分别为67.17%、58.13%、2 587.96 kW。

关键词: 固体氧化物燃料电池, 液化天然气, 余热回收, ?分析, 混合工质

Abstract:

A new type of combined cooling, heating and power (CCHP) system is proposed, consisting of a dual recompression Brayton cycle, a CO2 reheat Rankine cycle and a two?stage flash cycle, to achieve synergistic waste heat recovery from a natural gas?fueled solid oxide fuel cell, utilization of liquefied natural gas (LNG) cold energy, and capture of CO? from flue gas. The cycle system was simulated using thermodynamic simulation software to analyze the effects of the mass fraction of mixed workmass Xe, the inlet pressure p23 of the CO2 reheat Rankine cycle expander, the pump outlet pressure p26 of the flash cycle, and the shunt ratio x on the system's thermal efficiency, saprophytic efficiency, net work output, and cold water recovery rate. The results demonstrate that increasing p23 is favorable to improve the net output work, thermal efficiency and hydronic efficiency of the system; decreasing p26 is favorable to improve the net output work and thermal efficiency of the system, and increasing the Xe mass fraction and shunt ratio can improve the net circulating work, thermal efficiency and hydronic efficiency of the system. When the mass fraction of Xe is 0.3, p23 is 16 MPa and p26 is 13.5 MPa, the thermal efficiency, the net efficiency and the net output work of the system are 67.17%, 58.13% and 2 587.96 kW, respectively.

Key words: Solid oxide fuel cell, Liquefied natural gas, Waste heat recovery, Energy analysis, Mixed media

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引用本文

张忠睿, 姜媛媛, 曹英举, 陈旭阳, 王长顺, 姜文全. 基于LNG冷能的双闪蒸联合循环系统热经济分析[J]. 辽宁石油化工大学学报, 2025, 45(5): 73-80.

Zhongrui ZHANG, Yuanyuan JIANG, Yingju CAO, Xuyang CHEN, Changshun WANG, Wenquan JIANG. Thermo⁃Economic Analysis of Dual⁃Flash Combined Cycle System Using LNG Cold Energy[J]. Journal of Liaoning Petrochemical University, 2025, 45(5): 73-80.

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链接本文: https://journal.lnpu.edu.cn/CN/10.12422/j.issn.1672-6952.2025.05.009

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