摘要
【目的】以系统吨水净发电量为分析目标,研究不同地热源流体温度下系统性能参数的变化趋势。【方法】采用EES软件建立了1 MW地热有机朗肯循环模型,研究了R245fa、R1233zd(E)、R134a和R152a四种有机工质在90~150℃热源温度下系统热力学性能参数的变化规律。【结果】在相同热源温度下,随工质蒸发温度的升高,选用不同有机工质时系统的吨水净发电量先增大后减小,即存在最大值,其中以工质R134a的系统吨水净发电量最大,当热源温度为110℃时,吨水发电量为3.06 kW⋅h/t,在热源温度为90~150℃时,发电系统的最大吨水净发电量、工质蒸发温度、系统净效率和膨胀比均随着地热源温度的升高而增大,工质质量流量随着地热源温度的升高而减小。【结论】研究结果可为1 MW地热双循环发电系统热力学参数选择提供依据。
[Objectives]Taking the net power generation per ton of water in the system as the analysis objective,study the variation trend of system performance parameters under different fluid temperatures of geothermal sources.[Methods]A 1 MW geothermal organic Rankine cycle model is established using EES software.The optimization objective is to study the thermodynamic performance parameters of four organic working fluids,R245fa,R1233zd(E),R134a,and R152a,at a heat source temperature of 90-150℃.[Results]Under the same heat source temperature,as the evaporation temperature of the working fluid increases,the net power generation per ton of water increases first to a maximum and then decreases for the system using different organic working fluids.Among them,the net power generation per ton of water of the working fluid R134a is the highest.When the heat source temperature is 110℃,the net power generation per ton of water is 3.06 kW⋅h/t.When the heat source temperature is between 90~150℃,the maximum net power generation per ton of water,working fluid evaporation temperature,system net efficiency,and expansion ratio of the power generation system increase with the increase of the ground heat source temperature.However,the mass flow rate of the working fluid decreases with the increase of the ground heat source temperature.[Conclusions]The research results can provide a basis for the thermodynamic parameter selection of a 1 MW geothermal dual cycle power generation system.
作者
刘超
刘亮德
连天成
赵伟
杨绪飞
刘广林
LIU Chao;LIU Liangde;LIAN Tiancheng;ZHAO Wei;YANG Xufei;LIU Guanglin(North China Company,China Petroleum Engineering&Construction Co.,Ltd.,Renqiu 062552,Hebei Province,China;School of Mechanical Engineering,Beijing Institute of Petrochemical Technology,Daxing District,Beijing 102617,China;School of Energy,Power and Mechanical Engineering,North China Electric Power University,Changping District,Beijing 102206,China)
出处
《发电技术》
2025年第6期1223-1230,共8页
Power Generation Technology
基金
国家自然科学基金项目(51776064)。
关键词
新能源
双循环系统
地热发电
有机工质
系统优化
有机朗肯循环
new energy
dual circulation system
geothermal power generation
organic working fluid
system optimization
organic Rankine cycle
