基于地热资源利用的联合发电系统性能分析与评价  

Performance analysis and evaluation of combined power generation system based on geothermal resources utilization

作　　者：曾祥瑞 ZENG Xiangrui(Daqing Oilfield Tianyu Engineering Design Co.,Ltd.)

机构地区：[1]大庆油田天宇工程设计有限责任公司

出　　处：《石油石化节能与计量》2025年第4期74-78,共5页Energy Conservation and Measurement in Petroleum & Petrochemical Industry

摘　　要：为提高地热资源的综合用能水平,减少油气场站对于传统能源的消耗量。在能量梯级利用的基础上,将地热水蕴含的热能和LNG蕴含的冷能相融合,构建基于地热资源利用的循环发电系统,并分析了不同参数变化对系统热效率和㶲效率的影响程度,分别以热效率最大和㶲效率最大为目标函数,对工艺实施优化过程。结果显示,浓度在90%以上时的氨水,系统性能优于70%和80%浓度的氨水;氨水蒸发压力越大、地热水蒸发压力越大、LNG气化压力越大、天然气供气压力越小、换热器夹点温差越大,系统热效率越高;基于㶲效率最大为目标函数的优化效果较好,优化前后的热效率从21.38%提升至24.41%,㶲效率从38.14%提升至45.07%,净输出功从2140 kW提升至2711 kW。研究结果可为中低温地热资源的综合利用提供实际参考。In order to improve the comprehensive energy consumption level of geothermal resources,the consumption of traditional energy in oil and gas stations has been reduced.On the basis of stepped energy utilization,the thermal energy contained in geothermal water and the cold energy contained in LNG are integrated to build a cyclic power generation system based on geothermal resource utilization.The impact of different parameter changes on thermal efficiency of the system and exergic efficiency is analyzed.The optimization process is implemented with the objective function of maximum thermal efficiency and maximum exergic efficiency.The results show that the performance of system is better than that of 70%and 80%when the concentration of ammonia is above 90%.The higher the evaporation pressure of ammonia water gets,the higher the evaporation pressure of geothermal water gets,the higher the gasification pressure of LNG gets,the lower the gas supply gets,and the larger the pinch point temperature difference of heat exchanger gets,the higher the thermal efficiency of system is.The optimization based on the maximum of the energy efficiency as an objective function is more effective.Before and after optimization,the thermal efficiency rises from 21.38%to 24.41%,the exergic efficiency rises from 38.14%to 45.07%,and the net output power rises from 2140 kW to 2711 kW.The research results can provide practical reference for the comprehensive utilization of middle and low temperature geothermal resources.

关 键 词：地热 LNG 发电 热效率 㶲效率 

分 类 号：TK123[动力工程及工程热物理—工程热物理]