液化天然气冷能与地热能耦合梯级利用系统分析OA
Analysis of the Cascade Utilization System of LNG Cold Energy and Geothermal Energy
为提升液化天然气(LNG)接收站冷能综合利用效率,以海南洋浦 LNG 接收站为研究对象,提出一种 LNG冷能与地热能耦合梯级利用系统,旨在实现不同品位能量的阶梯式转化与利用.系统将LNG气化过程划分为 4 个温度阶段,分别匹配相应工况的朗肯循环进行余热回收发电.同时,引入地热蒸汽作为高温热源驱动朗肯循环,并在放热后回注地热储层,实现地热资源的可持续开发.在发电基础上,系统耦合蒸馏法海水淡化单元,利用朗肯循环后的余热进行海水淡化,实现冷热电联供.采用 HYSYS 软件对系统开展流程模拟,设定 LNG 进口温度为-162℃、气化压力为 0.1 MPa,地热蒸汽温度为 115℃、压力为 0.1 MPa,冷却水温度为 25℃.在模拟基础上,对各朗肯循环子系统及整体系统进行㶲分析,评估能量利用效率与㶲损分布.结果表明:系统净输出电功率为25 372.1 kW,淡水产量为 2 781.5 kg/h,整体㶲效率为 47%.4 个温度阶段的朗肯循环发电量分别占总发电量的60.9%、23.2%、4.6%及 11.3%.损失分析显示,换热器为系统中主要的㶲损源,其㶲损失远高于压力设备,是能量损失最集中的环节.该系统通过朗肯循环实现地热与 LNG 冷能的高效耦合发电,不仅提升了能源综合利用效率,还有效缓解了 LNG冷能直接排放对海洋环境造成的低温污染问题.
To enhance the comprehensive utilization efficiency of cold energy at liquefied natural gas(LNG)re-ceiving terminals,this study focuses on the Hainan Yangpu LNG receiving station and a cascade utilization system that integrates LNG cold energy with geothermal energy was proposed.The system aimed to achieve stepwise con-version and utilization of energy at different quality levels.The LNG gasification process was divided into four tem-perature stages,each matched with a Rankine cycle operating under corresponding conditions to recover waste heat for power generation.Meanwhile,geothermal steam was introduced as a high-temperature heat source to drive the Rankine cycles,and after heat release,it was reinjected into the geothermal reservoir to ensure sustainable geother-mal resource development.In addition to power generation,the system integrated a distillation-based seawater de-salination unit,utilizing waste heat from the Rankine cycles for seawater desalination,thereby enabling combined cooling,heating,and power generation.Process simulation of the system was conducted using HYSYS software,with an LNG inlet temperature of-162℃,a gasification pressure of 0.1 MPa,a geothermal steam temperature of 115℃,a pressure of 0.1 MPa,and a cooling water temperature of 25℃.Based on the simulation,exergy analy-sis was performed for each Rankine cycle subsystem and the overall system to evaluate energy utilization efficiency and exergy loss distribution.The results indicated that the system achieved a net power output of 25 372.1 kW,a freshwater production rate of 2 781.5 kg/h,and an overall exergy efficiency of 47%.The power generation contri-butions of the four temperature-stage Rankine cycles accounted for 60.9%,23.2%,4.6%,and 11.3%of the total power output,respectively.Exergy loss analysis revealed that heat exchangers were the primary source of exergy loss in the system,with exergy losses significantly higher than those of pressure equipment,making them the most concentrated points of energy loss.By coupling geothermal energy with LNG cold energy through Rankine cycles for efficient power generation,the system not only improved overall energy utilization efficiency but also effectively mit-igated the low-temperature marine environmental pollution caused by the direct discharge of LNG cold energy.
屈会格;安春国;翟煤源;张井志
山东电力工程咨询院有限公司,山东 济南 250013山东电力工程咨询院有限公司,山东 济南 250013山东电力工程咨询院有限公司,山东 济南 250013山东大学 核科学与能源动力学院,山东 济南 250061
能源科技
LNG冷能地热能朗肯循环发电HYSYS㶲分析
LNG cold energygeothermal energyRankine cycle power generationHYSYSexergy analysis
《郑州大学学报（工学版）》 2026 (5)
50-57,8
山东省重点研发计划(2024TSGC0952)
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