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为充分回收矿藏热采过程尾端低温蒸汽余热,提出一种适于蒸汽回收的新型闪蒸-双工质联合循环发电系统,以热力学第一、第二定律为基础,建立了该联合循环热力模型,采用R245fa为循环工质,编制计算程序对系统热效率、输出功率及火用效率进行了热力分析,并将其与单纯闪蒸、双工质朗肯循环进行性能对比。结果表明,在热源温度110℃、压力0.14 MPa情况下,净输出功随闪蒸压力、双工质循环蒸发压力的增大均呈先增大后减小的趋势,当闪蒸压力在0.048 33 MPa,低压级双工质循环蒸发压力为0.389 6 MPa时,系统整体及闪蒸-双工质阶段均存在最大功率,分别为6 249.2 kW、429.2 kW;热效率则随闪蒸压力增大先增大后减小,而随双工质压力的增大不断增大。其中双工质循环的热效率均低于联合循环,在多数情况下单纯闪蒸循环的热效率基本等于联合循环的热效率;火用效率变化规律与净输出功变化规律相同。
In order to fully recover the residual heat of the low temperature steam at the tail end of the thermal recovery process in mineral deposits, a new type of flash-duplex combined cycle power generation system suitable for steam recovery is proposed. Based on the first and second laws of thermodynamics, the combined cycle heat Model, using R245fa as circulating working fluid, the thermal analysis of thermal efficiency, output power and exergy efficiency of the system were made through calculation program, and the performance of the system was compared with that of pure Flash and Duplex Rankine cycle. The results show that with the heat source temperature of 110 ℃ and the pressure of 0.14 MPa, the net output power increases with the increase of flash pressure and double working cycle evaporation pressure first and then decreases. When the flash pressure is 0.048 33 MPa, the maximum power of the whole system and the flash-duplex phase exists at the pressure of 0.389 6 MPa for the low-pressure double-substance circulating cycle, respectively, which is 6 249.2 kW and 429.2 kW, respectively. The thermal efficiency increases first with increasing flash pressure After the big decrease, and with the double-working pressure increases. The thermal efficiency of the duplex cycle is lower than that of the combined cycle. In most cases, the thermal efficiency of the simple flash cycle is basically equal to the thermal efficiency of the combined cycle. The law of the exergy efficiency is the same as that of the net output work.