采用HFOs工质的地热ORC参数优化与热经济性评价

Parametric Optimization and Thermo-Economic Analyses of Geothermal ORCs Using HFOs as the Working Fluids

建立了地热有机朗肯循环(ORC)系统热力学和经济性模型,以最大净输出功率为目标,优化了典型氢氟烯烃(HFOs)工质R1224yd(Z)、R1233zd(E)、R1336mzz(Z)的蒸发和冷凝温度,分析了热经济性,并与传统工质R601、R601a、R245fa进行了比较。结果表明,最佳工况下,R1224yd(Z)与R245fa的蒸发和冷凝参数接近;地热水进口温度低于130℃时,R1336mzz(Z)净输出功率最大,相比R1233zd(E)提高1.47%~1.89%,但是,总换热器面积增幅超过17%;地热水进口温度高于130℃时,R245fa的净输出功率最大,发电成本比R1336mzz(Z)下降15.5%~16.8%。

A thermo-economic model was used to analyze the thermodynamic and economic characteristics of a geothermal ORC system.The evaporation and condensation temperatures of typical hydrofluoroolefins(HFOs)working fluids including R1224yd(Z),R1233zd(E)and R1336mzz(Z)were optimized to obtain the maximum net power.The thermo-economic characteristics were analyzed and compared with the traditional working fluids R601,R601a and R245fa.The results show that the evaporation and condensation parameters of R1224yd(Z)and R245fa are close under the optimal conditions.When the geothermal water inlet temperature is lower than 130°C,the net output power of R1336mzz(Z)is the maximum among the selected fluids,which is 1.47%∼1.89%more than that of R1233zd(E);but the heat exchanger area increases by more than 17%.When the geothermal water inlet temperature is higher than 130°C,the net output power of R245fa is the maximum,and the power generation cost is reduced by 15.5%∼16.8%compared with R1336mzz(Z).