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Thermal analysis and optimization of combined cooling, heating and power system using LNG cold energy
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Changshun WANG1, Xinyang SONG2, Fan YANG1, Yan QIAO1, Yang LI1, Yue GAO1, Pengfei LI1
Thermal Power Generation | 2024, 53(11) : 21 - 30
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Thermal Power Generation | 2024, 53(11): 21-30
• Special topic on low-carbon transformation of power system •
Thermal analysis and optimization of combined cooling, heating and power system using LNG cold energy
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Changshun WANG1, Xinyang SONG2, Fan YANG1, Yan QIAO1, Yang LI1, Yue GAO1, Pengfei LI1
Affiliations
  • 1.College of Petroleum Engineering, Liaoning Petrochemical University, Fushun 113001, China
  • 2.Chaoyang Hongshan Chemical Co., Ltd., Beijing 122300, China
Published: 2024-11-25 doi: 10.19666/j.rlfd.202403118
Outline
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In order to solve the problems of waste heat utilization, carbon capture and liquid natural gas (LNG) cold energy utilization of solid oxide batteries fueled by methane, a new type of combined cooling, heating and power system was established. The system includes the improved recompression supercritical mixed working fluid Brayton cycle, the transcritical CO2 heat recovery Rankine cycle and the secondary mixed working fluid organic Rankine cycle. The thermodynamic analysis, equipment exergy analysis, economic cost analysis of the circulation system, and the multi-objective optimization of the system by using the genetic algorithm in MATLAB. The results show that, increasing P1, T16 and the mass fraction of R14 in the second-stage Rankine cycle can improve the network, thermal efficiency, and exergy efficiency of the system, and reduce the average unit cost. P1 is the pressure at inlet the expander in the compressed supercritical mixed working fluid Brayton cycle, T16 is the inlet temperature of the expander in the transcritical CO2 regenerative Rankine cycle. Under the optimal working conditions, the thermal efficiency, exergy efficiency and average unit cost of the system are 64.70%, 47.85% and 24.20 dollars/GJ.

liquefied natural gas  /  combined cooling heating and power supply  /  mixed working medium  /  multi-objective optimization  /  economic analysis
Changshun WANG, Xinyang SONG, Fan YANG, Yan QIAO, Yang LI, Yue GAO, Pengfei LI. Thermal analysis and optimization of combined cooling, heating and power system using LNG cold energy[J]. Thermal Power Generation, 2024 , 53 (11) : 21 -30 . DOI: 10.19666/j.rlfd.202403118
Funding
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  • National Natural Science Foundation of China(52006094)
  • Liaoning Provincial Department of Education Fundamental Research Project(LJKMZ20220725)
Appendix
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Year 2024 volume 53 Issue 11
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111
47
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Article Info
doi: 10.19666/j.rlfd.202403118
  • Receive Date：2024-03-31
  • Online Date：2026-03-05
  • Published：2024-11-25
Article Data
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History
  • Received：2024-03-31
Funding
National Natural Science Foundation of China(52006094)
Liaoning Provincial Department of Education Fundamental Research Project(LJKMZ20220725)
Affiliations
    1.College of Petroleum Engineering, Liaoning Petrochemical University, Fushun 113001, China
    2.Chaoyang Hongshan Chemical Co., Ltd., Beijing 122300, China
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https://castjournals.cast.org.cn/joweb/rlfd/EN/10.19666/j.rlfd.202403118
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表12种不同金属材料的力学参数
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小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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