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以低焓地热能的深度利用为目标,用异戊烷、6种丁烷/己烷和5种异丁烷/己烷不同质量配比的二元非共沸混合物共12种物质作为亚临界ORC工质,利用窄点分析方法分析循环性能。研究表明,地热水进口温度在120~150℃时,混合工质异丁烷/己烷(0.65/0.35)的综合性能最佳,地热水出口温度最低,其输出净功率比纯工质异戊烷提高6.56~6.77倍;在150~170℃时,混合工质异丁烷/己烷(0.6/0.4)的综合性能最佳,地热水出口温度最低,其输出净功率比纯质异戊烷提高5.44~5.97倍;蒸发器和冷凝器是系统可用能损失主要部件,热源温度低时冷凝器中的可用能损失最大,但随着热源温度的升高,蒸发器的可用能损失所占比重将逐渐提高。
Aiming at the deep utilization of low enthalpy geothermal energy, 12 kinds of binary non-azeotropic mixtures with different mass ratios of isopentane, 6 kinds of butane / hexane and 5 kinds of isobutane / hexane were used as the subcritical ORC working fluid, the use of narrow point analysis method of analysis of cycle performance. The results show that when the inlet temperature of geothermal water is between 120 ℃ and 150 ℃, the isobutane / hexane (0.65 / 0.35) mixture has the best comprehensive performance and the lowest geothermal outlet temperature. The output net power is lower than that of the pure refrigerant Isopentane increased by 6.56 ~ 6.77 times. When the temperature was 150 ~ 170 ℃, the isobutane / hexane (0.6 / 0.4) mixture had the best comprehensive performance and the lowest outlet temperature of geothermal water. The output net power was higher than pure Isopentane increased 5.44 ~ 5.97 times; evaporator and condenser system is available to lose the main components, the heat source temperature is low when the condenser available energy loss maximum, but as the heat source temperature increases, the available energy loss of the evaporator The proportion will gradually increase.