Dynamic test on waste heat recovery system with organic Rankine cycle
来源期刊：中南大学学报(英文版)2014年第12期
论文作者：王志奇 刘力文 夏小霞 ZHOU Nai-jun(周乃君)
文章页码：4607 - 4612
Key words：organic Rankine cycle; waste heat recovery; dynamic performance
Abstract: Dynamic performance is important to the controlling and monitoring of the organic Rankine cycle(ORC) system so to avoid the occurrence of unwanted conditions. A small scale waste heat recovery system with organic Rankine cycle was constructed and the dynamic behavior was presented. In the dynamic test, the pump was stopped and then started. In addition, there was a step change of the flue gas volume flow rate and the converter frequency of multistage pump, respectively. The results indicate that the working fluid flow rate has the shortest response time, followed by the expander inlet pressure and the expander inlet temperature. The operation frequency of pump is a key parameter for the ORC system. Due to a step change of pump frequency (39.49-35.24 Hz), the expander efficiency and thermal efficiency drop by 16% and 21% within 2 min, respectively. Besides, the saturated mixture can lead to an increase of the expander rotation speed.
WANG Zhi-qi(王志奇)1, 2, LIU Li-wen(刘力文)1, XIA Xiao-xia(夏小霞)1, ZHOU Nai-jun(周乃君)2
(1. Institute of Mechanical Engineering, Xiang Tan University, Xiangtan 411105, China;
2. School of Energy Science and Engineering, Central South University, Changsha 410083, China)
Abstract:Dynamic performance is important to the controlling and monitoring of the organic Rankine cycle(ORC) system so to avoid the occurrence of unwanted conditions. A small scale waste heat recovery system with organic Rankine cycle was constructed and the dynamic behavior was presented. In the dynamic test, the pump was stopped and then started. In addition, there was a step change of the flue gas volume flow rate and the converter frequency of multistage pump, respectively. The results indicate that the working fluid flow rate has the shortest response time, followed by the expander inlet pressure and the expander inlet temperature. The operation frequency of pump is a key parameter for the ORC system. Due to a step change of pump frequency (39.49-35.24 Hz), the expander efficiency and thermal efficiency drop by 16% and 21% within 2 min, respectively. Besides, the saturated mixture can lead to an increase of the expander rotation speed.
Key words:organic Rankine cycle; waste heat recovery; dynamic performance
