为充分回收矿藏热采过程中尾端的低温蒸汽余热,根据热力学第一、第二定律,在单独抽汽回热、单独乏汽回热系统的基础上,提出一种新型抽汽-乏汽联合回热系统,并建立以低温蒸汽为热源的抽汽-乏汽联合回热理论模型。通过编制计算程序分别对带抽汽回热的ORC循环、乏汽回热ORC循环以及联合回热ORC循环的热力学性能进行了分析,并与无回热ORC循环的性能进行了比较。结果表明:3种回热循环的热效率、净输出功以及火用效率均随蒸发压力升高而升高,其中联合回热循环的热力性能最高,分别能达到11.37%、7 593 kW及51.9%,比相同工况下的无回热ORC循环分别增高百分比为19.6%、12.5%及15.1%;对于单位功耗火用损,各循环则表现为随蒸发压力的升高而逐渐递减,且有联合回热循环的单位功耗火用损<抽汽回热<乏汽回热<无回热ORC循环,在蒸发温度为105℃时,对应单位功耗火用损分别为0.91、0.95、1.06及1.22;同时,在相同抽汽压力下,联合回热循环的抽气系数α小于单独抽汽回热循环,工质质量流量基本相同,联合回热循环具有更好的热力性能。 In order to fully recover the residual heat of low temperature steam in the tail end of the thermal recovery process of mineral deposits, a new type of combined extraction-steam removal system based on the first and second laws of thermodynamics is proposed based on the separate extraction and recuperation, Thermal system, and establish a theoretical model of combined heat recovery of steam-steam with low-temperature steam as heat source. The thermodynamic performance of the ORC cycle with extraction and recuperation, the ORC cycle without steam recovery and the ORC cycle combined with regenerative heating were analyzed separately by compiling the calculation program and compared with the performance of the ORC cycle without regenerative cycle. The results show that the thermal efficiency, net output power and exergy efficiency of the three kinds of regenerative cycles both increase with the increase of evaporation pressure. The thermal performance of the combined regenerative cycle is the highest, reaching 11.37%, 7,593 kW and 51.9% respectively, , Respectively, which were 19.6%, 12.5% ​​and 15.1% higher than that of the non-recuperative ORC cycle under the same conditions respectively. For the unit power dissipation loss, each cycle showed a gradual decrease with increasing evaporation pressure, Unit thermal dissipation loss of combined heat recovery cycle