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为充分回收利用低温地热,利用第二类吸收式热泵升温原理,提出一种新型低温地热ORC-AHT联合循环发电热力系统。根据热力学第一、第二定律,建立热力学模型,编制计算程序并进行热力性能分析,结果表明:净输出功、热效率和火用效率随蒸发温度升高呈现先增加后减小的趋势,且随热源温度升高而增加。根据热力学模型设定条件,从T-Q图中可看出,与单级ORC系统相比,耦合系统可降低火用损失,提升联合系统热力性能。热源温度为373、383和393K时,耦合系统净输出功较单级ORC系统分别增加30.48%、21.9%和17.7%;热效率较单级ORC系统分别增加11.6%、7.25%和4.19%;火用效率较单级ORC系统分别增加45.45%、53.95%和60.05%。
In order to fully utilize the low-temperature geothermal energy, a new type of low-temperature geothermal ORC-AHT combined cycle thermal power generation system is proposed by using the second type of absorption heat pump heating principle. According to the first law and the second law of thermodynamics, the thermodynamic model was established, the calculation program was compiled and the thermodynamic performance was analyzed. The results showed that the net output power, the thermal efficiency and the exergy efficiency tended to increase at first and then decrease with the increase of evaporation temperature, Heat source temperature increases. According to the thermodynamic model setting conditions, it can be seen from the T-Q diagram that the coupling system can reduce the exergy loss and improve the thermal performance of the combined system compared with the single-stage ORC system. Compared with the single-stage ORC system, the net output power of the coupled system increased by 30.48%, 21.9% and 17.7% respectively when the heat source temperature was 373, 383 and 393K; the thermal efficiency increased by 11.6%, 7.25% and 4.19% Compared with single-stage ORC system, the efficiency increased by 45.45%, 53.95% and 60.05% respectively.