中文摘要：

为充分回收矿藏热采尾端低温余热蒸汽,提高能源利用率,建立以低温蒸汽为热源的抽汽-乏汽联合回热有机朗肯循环（ORC）系统,选取6种不同临界温度的干湿工质,提出以工质潜热比σr评价蒸发器火用损及系统热力性能的标准,在热力学第一、第二定律基础上,通过编制程序分析不同蒸发温度T11、热源温度Tg下工质对系统的影响,确定最佳工况点,选择最佳工质。结果表明：随工质临界温度Tc增大,其潜热比σr较大,系统热力性能较高,且热源温度愈高,不同工质间热力性能差距愈大;对于蒸汽热源,工质在低于临界温度25K左右的热源下工作可获得最大热力性能;增加联合回热有助于提高系统热力性能,对于各工质有R236fa〉R123〉R152a,当Tg=413.15K时,若系统采用R236fa作为工质,系统较ORC系统净输出功高出1455kW。

英文摘要：

In order to make full use of the waste heat steam which produced in the process of mineral mining with steam injection, the combined regeneration organic Rankine cycle（ORC） system with low temperature steam was established and the standard for evaluating exergy loss of evaporator and thermodynamic performance was put forward. Based on the first and second thermodynamic law, Using the calculation program to analyze the thermodynamic performance under different work fluids with different evaporation and heat source temperature, then the best fluid and operating point can determine by it. The results show that with the critical temperature of the work fluid increasing, the proportion of latent heat is larger and the thermal performance is higher. At the same time, the gap between different fluids of thermal performance is greater when the temperature of heat source increases. As for the steam heat source, the fluid works at the heat source whose temperature bellows the critical temperature about 25 K can obtain the maximum performance. The combined regeneration system has better performance and reveals to R236fa〉R123〉R152a. If the system wses R236 fa as fluids, it can increase 1455 k W net work compared to ORC system under the heat source temperature of 413.15 K.