以R142b为工质的有机朗肯循环低温发电系统研究（英文）  

Experimental study of R142b in low-temperature energy conversion system based on Organic Rankine Cycle

作　　者：魏莉莉[1] 

机构地区：[1]宁波工程学院建筑与交通工程学院,宁波315016

出　　处：《低温工程》2016年第4期61-68,共8页Cryogenics

摘　　要：研究了以R142b为循环介质、采用螺杆式膨胀机的低温热能有机朗肯循环发电系统。在热源温度低于80℃的条件下,膨胀机最大能量转化效率为6%,系统总效率5.16%。在系统膨胀效率达97%的情况下,传输能耗导致机械效率仅有48%—65%,因此系统总效率较低,但最大效率为32%。提高蒸发压力、降低冷凝压力是提升能量转化效率的根本途径。实验研究表明,降低膨胀机入口蒸汽干度对膨胀效率略有促进,主要由于少量液体参与膨胀减少了膨胀环节的渗漏,提高了膨胀效率。实验表明该低温热能发电系统可行,但系统效率较低,有待进一步优化提高。Experimental investigation of a low-temperature energy-to-power conversion system was presented using R142b as the working fluid. Screw compressor worked in the reverse operation as the expander. The heat source in this experiment was lower than 80 ℃. The maximum energy conversion efficiency was 6% with the systematic efficiency up to 5.16%. Due to the high energy consumption in the transmission process,although the expansion efficiency was as high as 97% in maximum, the mechanical efficiency was only 48%-65% ,which lead to a low systematic efficiency. The maximum exergy efficiency was 32%. High- er evaporating pressure and lower condensing pressure raised the power output, which followed the theoreti- cal principle. Theoretically, the inlet of liquid had no advantage in the expansion. The qualitative experimental result shows that for R142b,inlet of liquid improves the expansion slightly. But this promotion comes mainly from the reduction of leakage, which means lower outlet temperature and pressure, larger enthalpy difference and higher expansion efficiency. The experiments prove the feasibility of this energy conversion concept. However, the systematic efficiency is still considerably low, and further optimization work is required.

关 键 词：有机朗肯循环 低温热源 能量转化发电 效率 

分 类 号：TB653[一般工业技术—制冷工程]