不同余热对有机朗肯循环余热回收效果的影响

The influence of different waste heat on waste heat recovery performance based on organic Rankine cycle

针对以环戊烷和R245fa为工质的有机朗肯循环(organic Rankine cycle,ORC)系统进行研究。分析蒸发压力、过热度、过冷度、回热度(回热器液态工质进出口温差)、膨胀机效率和膨胀比等对ORC系统工作效率的影响,缸套水余热和中冷器余热对ORC系统功率提升的影响。研究发现:蒸发压力、膨胀机的效率和膨胀比对ORC系统工作效率的影响较大;通过合理配比2个ORC循环中烟气的热量,能显著增加系统的输出功率;中冷器布置在回热器上游时中冷器余热对系统工作效率的提高比中冷器布置在下游时更好。

For the organic Rankine cycle(ORC)system,cyclopentane and R245fa are selected to analyze the effects of evaporation pressure,overheating,overcooling,reheating(regeneration thermoelectric inlet and outlet temperature difference),expander efficiency and expansion ratio on the ORC system efficiency.Among them,the evaporation pressure,expander efficiency and the expansion ratio have a great influence.The effect of the waste heat of the liner water and the waste heat of the intercooler on the power boost of the Rankine cycle system is also studied.It is found that the proper heat output ratio of flue gas in the two ORC can significantly increase the output power of the system.Moreover,the waste heat of the intercooler is better in the upstream of the regenerator than that in the downstream.