低温热能有机物朗肯循环发电系统的最佳负载特性实验研究

针对低温热能的回收利用,搭建了采用涡旋膨胀机的有机物朗肯循环发电实验系统,以异丁烷为工质,研究了热源温度和负载对小型有机物朗肯循环发电系统性能的影响.结果表明:在不同的热源温度和工质流量条件下,都存在一个最佳负载电阻,使得系统具有最大的发电功率、比发电功率和发电效率;在设计发电系统时,应为涡旋膨胀机匹配合适的永磁发电机和负载电阻,以使系统发挥最优性能;当热源温度不超过120℃时,系统的最大发电功率为1.05kW,最高发电效率为4.51%,膨胀机的最大转速和膨胀比分别可达2 922r/min和3.03.

Experimental Study of Optimal Load Characteristics of Low Temperature Heat Organic Ranine Cycle Power Generation

The experimental study of the small organic Ranine cycle (ORC) power system performance under different heat resource temperature and different load resistance was conducted. The organic Rankine cycle power generation experimental system was built using scroll expander with the working fluid R600a utilizing low temperature heat. The results show that when the heat source temperature does not exceed 120 ℃, the experimental system has a maximum generating power of 1.05 kW and power generation efficiency of up to 4.51%, the scroll expander rotation speed and expansion ratio can reach 2 922 r/min and 3.03, respectively; There exists an optimum load resistance value which makes the power generation, unit power output and power generation efficiency ratio maximum under different heat temperatures and different working fluid mass flow rates. The scroll expander should match permanent magnet generator and the load when designing power systems so that the system can get the best performance.