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针对有机朗肯循环(Organic Rankine Cycle,ORC)中电动工质泵耗功占膨胀机输出功比例较大的问题.提出一种多级气动液压泵,该泵利用蒸发器内产生的蒸汽为动力,给ORC系统供液.以R245fa为工质,分析了气动液压泵与电动泵的ORC系统受蒸发温度的影响情况对比、不同级的气动液压泵的性能随蒸发温度的影响、ORC系统性能受泵效率的影响对比.结果表明,采用多级气动液压泵后,ORC系统的净输出功率等于膨胀机的输出功率;系统效率得到改善,且随着泵级数的增加而更为明显;泵效率随蒸发温度的升高而减小,但随泵级数的增加而提高.在蒸发温度为145℃、冷凝温度为35℃时,电动泵供液的ORC系统净输出功率为25.8 kW,系统效率为0.106,而采用4级气动液压泵的ORC系统净输出功率为33.2 kW,系统效率为0.12.,Considering that the working fluid pump consumes a large percentage of the energy generated by the expander in organic Rankine cycle (ORC),this paper proposes to use a multi-stage gas-liquid booster pump which uses the vapor generated in evaporator to pressurize the working fluid in ORC.The performance of ORC with the various evaporating temperatures are compared when multi-stage gas-liquid booster pump with different stages and electric driving pump are used.Also compared are the effects on the performance of multi-stage gas-liquid booster pump from evaporating temperature,and the influence on the system performance from the pump efficiency.The results show that the net power of ORC equals to the power generated by expander when the multi-stage gas-liquid booster pump is used.The thermal efficiency of the system is improved with the increase of pump stage.The pump efficiency decreases with the increase in evaporating temperature,while increases with the increases of pump stage.With evaporating temperature of 145 ℃ and condensation temperature of 35 ℃,the system’s net power and thermal efficiency are 25.8 kW and 0.106,respectively,when the electric driving pump is used,and they are improved to 33.2 kW and 0.120,respectively,when the four-stage gas-liquid booster pump is used.