EN华瀛液化天然气接收站冷能梯级利用工艺设计及能效优化
Research on cold energy cascade utilization process design and energy efficiency optimization for Huaying LNG receiving station
- 热力发电 2025年第11期 页码：49-57
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DOI：10.19666/j.rlfd.202502121
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纸质出版：2025
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黄华, 周万伟, 季炫宇, 等. 华瀛液化天然气接收站冷能梯级利用工艺设计及能效优化[J]. 热力发电, 2025,(11):49-57.
黄华, 周万伟, 季炫宇, et al. Research on cold energy cascade utilization process design and energy efficiency optimization for Huaying LNG receiving station[J]. Thermal Power Generation, 2025, (11): 49-57.
黄华, 周万伟, 季炫宇, 等. 华瀛液化天然气接收站冷能梯级利用工艺设计及能效优化[J]. 热力发电, 2025,(11):49-57. DOI： 10.19666/j.rlfd.202502121.
黄华, 周万伟, 季炫宇, et al. Research on cold energy cascade utilization process design and energy efficiency optimization for Huaying LNG receiving station[J]. Thermal Power Generation, 2025, (11): 49-57. DOI： 10.19666/j.rlfd.202502121.
摘要
基于广东华瀛液化天然气（LNG）接收站的设计运行条件和周边产业环境，首先设计了一套热机循环发电耦合浅冷冻库的LNG冷能梯级利用方案，并采用专业软件HYSYS建模求解流程中的关键参数，以提升能效和大规模消纳冷能为目标，对原有方案进一步优化改进。结果表明：在全年最低气化日LNG外输量为228 t/h的条件下，原方案采用一级热机循环与冻库结合，年发电量超过3 283×10~4 k W·h，并满足了7 500 m~3冻库的冷负荷需求；而优化设计后的新方案采用“两级热机循环-浅冷冻库”设计，通过提升热源温度，并改用质量分数40%乙烷和60%丙烷的混合工质，使热机循环系统的设计年发电量可提升至6 204×10~4 kW·h，单位质量LNG的净发电量从原先的17.54(kW·h)/t增加到33.02(kW·h)/t，还可节约约5 364.1万元/年电费。尽管多级的热机循环能够减少温差造成的不可逆损失，但考虑投入产出比及运行可靠性等因素，第二方案能与华瀛LNG接收站实际条件紧密结合，具有较好的工程可行性和经济性。上述2种冷能梯级利用设计方案各有优势，适用于接收站的不同发展阶段和LNG冷能利用的不同评价指标，为华瀛LNG接收站全面投产后的冷能利用提供了有益参考。
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