低温发电有机朗肯循环系统性能实验研究

Experimental Investigation on Performance of Organic Rankine Cycle Power System Driven by Low-Temperature Heat Sources

基于进口温度为90℃的热水型低温热源,以HFC245fa为工质,以单位热水质量流量对应的发电功率(比电功)最大化为目标函数,开展了以小型辐流式汽轮机为膨胀部件的低温发电有机朗肯循环实验系统性能优化研究。结果表明:在热源进口温度为90℃、冷凝温度为30℃的工况下,采用渐缩喷管时,蒸发压力为0.596 MPa(蒸发温度为69.16℃)时比电功达到最大值1.28 kJ/kg;采用缩放喷管时,蒸发压力为0.698 MPa(蒸发温度为75.16℃)时比电功达到最大值0.87 kJ/kg。

The performance of a small organic Rankine cycle power system with a radial turbine as its expander and HFC245fa as the working fluid were experimentally investigated based on low-temperature hot-water type heat sources. Results indicate that at a fixed source inlet temperature of 90℃ and condensing temperature of 30℃, when a converging nozzle is adopt in the radial turbine, the optimum evaporation pressure and the corresponding maximum PPM （power output per unit mass of heat source water） is 0.596 MPa and 1.28 kJ/kg respectively; while the optimum evaporation pressure and the maximum PPM are 0.698 MPa and 0.87 kJ/kg respectively when a converging-diverging nozzle is used.