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LNG Cold Energy Used in Exhaust Gas Reflux Rankine Cycle and CO2 Liquefaction Technology
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Wei-hong HE1, 2, Yin-di ZHANG1, 2, *, Ying-nan LI3, Xiao-hong HUANG1, 2, Zheng-qin SHENG1, 2
Science Technology and Engineering | 2025, 25(7) : 2760 - 2766
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Science Technology and Engineering | 2025, 25(7): 2760-2766
• Papers·Petroleum and Natural Gas Industry •
LNG Cold Energy Used in Exhaust Gas Reflux Rankine Cycle and CO2 Liquefaction Technology
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Wei-hong HE1, 2, Yin-di ZHANG1, 2, *, Ying-nan LI3, Xiao-hong HUANG1, 2, Zheng-qin SHENG1, 2
Affiliations
  • 1 College of Petroleum Engineering, Yangtze University, Wuhan 430100, China
  • 2 State Key Laboratory of Low-carbon Catalysis and Carbon Dioxide Utilization, Lanzhou 730000, China
  • 3 CNOOC Jiangsu Natural Gas Co., Ltd., Yancheng 224000, China
Published: 2025-03-08 doi: 10.12404/j.issn.1671-1815.2403435
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In order to effectively utilize LNG(liquefied natural gas) cold energy and liquefy CO2 in gas turbine exhaust gas, a new process of LNG cold energy to liquefy CO2 and CO2 power cycle was proposed. In this process, Reheat cycle and regenerative cycle were added on the basis of conventional Rankine cycle, and multi-flow strand heat exchanger was set up. Chemical process simulation software was used to simulate the process flow and sensitivity analysis of reflux temperature, interstage cooling temperature and maximum circulating temperature and pressure was carried out to obtain the best operating parameters. Exergy efficiency, specific work and CO2 liquefaction rate of the system were analyzed and calculated by exergy analysis. Exergy efficiency of exergy was 54.16%, specific work was 335.9 kJ/kg LNG, and CO2 liquefaction rate was 0.621 7 kg/kg LNG in a new process. The evaluation indexes of the new process were better than those of the existing process. As for the exergic efficiency, exergic efficiency of exergic was as the highest and the temperature of CO2 after liquefied was as the constraint condition, exergic efficiency of exergic was 54.28% and specific power was 337.5 kJ /kg LNG, so the system performance was further improved.

LNG cold energy utilization  /  liquefied CO2  /  exhaust gas reflux  /  rankine cycle  /  sensitivity analysis
Wei-hong HE, Yin-di ZHANG, Ying-nan LI, Xiao-hong HUANG, Zheng-qin SHENG. LNG Cold Energy Used in Exhaust Gas Reflux Rankine Cycle and CO2 Liquefaction Technology[J]. Science Technology and Engineering, 2025 , 25 (7) : 2760 -2766 . DOI: 10.12404/j.issn.1671-1815.2403435
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Year 2025 volume 25 Issue 7
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Article Info
doi: 10.12404/j.issn.1671-1815.2403435
  • Receive Date：2024-05-09
  • Online Date：2026-03-30
  • Published：2025-03-08
Article Data
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History
  • Received：2024-05-09
  • Revised：2024-07-09
Funding
Affiliations
    1 College of Petroleum Engineering, Yangtze University, Wuhan 430100, China
    2 State Key Laboratory of Low-carbon Catalysis and Carbon Dioxide Utilization, Lanzhou 730000, China
    3 CNOOC Jiangsu Natural Gas Co., Ltd., Yancheng 224000, China
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表12种不同金属材料的力学参数
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Number of
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Number of
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鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
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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