郑州大学学报（工学版）2026，Vol.47Issue(5)：50-57,8.DOI:10.13705/j.issn.1671-6833.2026.05.004
液化天然气冷能与地热能耦合梯级利用系统分析
Analysis of the Cascade Utilization System of LNG Cold Energy and Geothermal Energy
摘要
Abstract
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.关键词
LNG冷能/地热能/朗肯循环发电/HYSYS/㶲分析Key words
LNG cold energy/geothermal energy/Rankine cycle power generation/HYSYS/exergy analysis分类
能源科技引用本文复制引用
屈会格,安春国,翟煤源,张井志..液化天然气冷能与地热能耦合梯级利用系统分析[J].郑州大学学报（工学版）,2026,47(5):50-57,8.基金项目
山东省重点研发计划(2024TSGC0952) （2024TSGC0952）
