变工况下有机朗肯循环发电特性的实验研究

Experimental Research on Power Generation by Organic Rankine Cycle under Variable-Condition Operation

有机朗肯循环是利用中低温热源的重要技术之一。基于R245fa为工质的低温热源驱动有机朗肯循环发电系统,通过改变电加热器功率来研究其在变工况下的发电特性。结果表明:热源热量变化12%时,系统最大净发电量为7.8 k W,发电效率为8.7%;系统最小净发电量为6.9 k W,发电效率为8.26%;系统重新达到稳定状态的时间为35~45 min,相同时间内,系统对热源温度降低的响应更迅速而对热源温度升高的响应速度较慢;在此热源的改变条件下系统仍能稳定运行。

Organic Rankine cycle(ORC)is one of the key technologies to utilize low and medium temperature heat sources.In this paper,the power generating characteristics of the ORC system under variable-condition operation is studied by changing the electric heating power according to an ORC power generation system driven by low-temperature heat source using R245fa as working fluid.The results show that when the changing range of the heat source power is less than 12%,the maximum net generation capacity is 7.8 kW and the power generation efficiency is 8.7%.The minimum net generation capacity is 6.9 kW and the power generation efficiency is 8.26%.The re-stable time of the system is 35~45 min,where the system responds more quickly to the decrease than to the increase of heat source at the same time.The system can operate stably under this fluctuating heat source condition.