地热能有机朗肯循环系统设计与动态仿真  

Design and dynamic simulation of a geothermal organic Rankine cycle system

作　　者：饶建业 李骥飞 郭智琳 苗政[2] RAO Jianye;LI Jifei;GUO Zhilin;MIAO Zheng(China Electric Power Planning&Engineering Institute,Beijing 100120,China;Beijing Key Laboratory of Multi-phase Flow and Heat Transfer of Low-grade Energy,North China Electric Power University,Beijing 102206,China)

机构地区：[1]电力规划总院有限公司,北京100120 [2]华北电力大学低品位能源多相流与传热北京市重点实验室,北京102206

出　　处：《热力发电》2024年第4期19-27,共9页Thermal Power Generation

基　　金：国家重点研发计划(2021YFB1507303)。

摘　　要：针对地热能利用,根据地热井口条件通过热力学计算和设备选型设计了对应的ORC机组,并对该机组动态特性进行了仿真;研究了热源温度和流量、冷却水温度以及工质流量4种参数变化对ORC机组关键运行参数和性能的影响规律。结果表明:机组输出性能对冷却水温度变化最为敏感,冷热源温度增大10℃,轴功分别减小16%和增大7%;热源温度和流量增大都会使过热度、蒸发压力和轴功显著升高,热效率略有下降,但其对机组冷端传热的影响有限,对热端传热的影响很小,过热度和蒸发压力几乎不变;相比冷热源参数的变化,工质流量变化时机组关键参数的波动最小,机组能很快恢复稳定。An organic Rankine cycle(ORC)unit is designed through thermodynamic analysis and equipment type selection under geothermal conditions.Then,this unit is simulated to study its dynamic operating characteristics and investigate the influences of four parameters,such as heat source temperature,mass flow rate,cooling water temperature and working fluid mass flow rate,on key operating parameters and performance of the ORC unit.The results show that,the output performance of the unit is primarily affected by the cooling water temperature.An increase of 10℃in the heat and cold source temperatures results in a decrease of 16%and an increase of 7%in the output power,respectively.The increased heat source temperature and mass flow rate will make the degree of superheat,evaporating pressure and shaft work increase significantly,and the system thermal efficiency decrease slightly.However,the effect of increasing heat source temperature and mass flow rate on the heat transfer of the cold side is limited,that on the hot side heat transfer is also neglectable,so the vapor superheat and evaporating pressure remains constant.Compared with the change of cold and heat source parameters,the change of working fluid mass flow rate has the lowest overshoot of parameters during dynamic operation of the unit,and the unit can reach the next steady state rapidly.

关 键 词：有机朗肯循环 地热源 动态仿真 系统输出功 热效率 

分 类 号：TM616[电气工程—电力系统及自动化]