换热器压降对ORC发电系统的影响

在考虑换热器压降及散热损失的情况下建立中低温地热驱动的有机朗肯循环(ORC)发电系统模型并通过500 kW示范工程进行验证。模型选取5种有机工质,研究换热器压降在不同热源温度、蒸发温度和冷凝温度下对系统性能的影响。研究结果表明随着热源温度以及蒸发温度的升高,压降对系统净发电量以及净发电效率的影响逐渐降低,但随着冷凝温度的升高,压降对系统净发电量的影响逐渐升高。其中,采用R227ea的系统受换热器压降影响最小,采用R123的系统受影响最大。

RESEARCH OF HEAT EXCHANGER PRESSURE LOSS ON ORC POWER GENERATION SYSTEMS

This paper presents a study of heat exchangers pressure and heat loss influencing on organic Rankine cycle(ORC)driven by medium and low temperature geothermal water. The model of the ORC system is established and verified by 500 kW ORC demonstration project located at Huabei Oilfield. Using five kinds of working fluids,the effect of the pressure loss on the performance of the ORC system under different heat source temperature,evaporation temperature and condensation temperature are studied. The results show that the effect of the pressure loss on the performance of the net power generation and net generation efficiency decreases with the increase of the heat source temperature and the evaporation temperature,the effect of the pressure loss on the performance of the net power generation increases with the increase of the condensation temperature. For using R227 ea as the working fluids,the effect of heat exchangers pressure loss on net power generation of the system has the smallest reduction,and for using R123 as the working fluids,the effect on net power generation of the system is greatest.