Abstract Multi-effect distillation-thermal vapor compression (MED–TVC) systems have attracted increasing attention due to their relatively low steam consumption. In this work, comprehensive thermal and exergy analyses of MED and MED–TVC systems were implemented. Besides, a detailed energy utilization diagram (EUD) analysis was conducted to reveal the mechanism of the internal exergy loss. According to the EUD analysis, TVC could solve energy level mismatch and improve energy utilization. However, the system's exergy loss was greatly increased. With the introduction of TVC, the performance ratio (Pr) increased from 10.88 to 14.11, and the energy consumption (Q) decreased from 224.09 kJ/kg-Mp to 181.30 kJ/kg-Mp. In addition, a countercurrent grouping feed was adopted in the system. The influence of the suction position combined with different effect group division methods for the 13-effect MED–TVC system was also investigated. Five different effect group division methods were analyzed in terms of system efficiency, performance ratio, exergy destruction, and energy consumption. The results indicated that a more uniform distribution of effects among the effect groups was beneficial for improving the performance of the MED–TVC system. Furthermore, both the Pr and system exergy efficiency (y) improved with an increase in the suction effect number.

中文翻译：

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不同效果组划分的MED-TVC系统火用分析与优化

摘要 多效蒸馏-热蒸汽压缩 (MED-TVC) 系统因其相对较低的蒸汽消耗而受到越来越多的关注。在这项工作中，对 MED 和 MED-TVC 系统进行了全面的热分析和火用分析。此外，还进行了详细的能量利用图（EUD）分析，以揭示内部火用损失的机制。根据EUD分析，TVC可以解决能级错配，提高能源利用率。但是，系统的火用损失大大增加。随着TVC的引入，性能比（Pr）从10.88提高到14.11，能耗（Q）从224.09 kJ/kg-Mp降低到181.30 kJ/kg-Mp。此外，该系统采用逆流分组进料。对 13 效 MED-TVC 系统，还研究了吸入位置结合不同效组划分方法的影响。从系统效率、性能比、火用破坏和能耗方面分析了五种不同的效果组划分方法。结果表明，效果组之间更均匀的效果分布有利于提高 MED-TVC 系统的性能。此外，Pr 和系统火用效率 (y) 都随着吸入效应数的增加而提高。结果表明，效果组之间更均匀的效果分布有利于提高 MED-TVC 系统的性能。此外，Pr 和系统火用效率 (y) 都随着吸入效应数的增加而提高。结果表明，效果组之间更均匀的效果分布有利于提高 MED-TVC 系统的性能。此外，Pr 和系统火用效率 (y) 都随着吸入效应数的增加而提高。