关键词: 混合醇, 机械蒸汽再压缩, 热泵精馏, 热集成, 年总费用, 能耗

Abstract: The low grade steam is transformed into a high grade steam through the compression by mechanical vapor recompression(MVR) heat pump technology, and the high grade steam is cyclic utilized for heat source to reduce energy consumption. The heat integration technology is reasonable to match the heat exchange of cold and hot logistics to improve the effective energy utilization of logistics. In view of the high energy consumption and low mechanical efficiency of the distillation process, heat integrated separation technology based on the MVR heat-pump distillation was applied to separate the four mixed alcohol system in this research, and the MVR heat-pump distillation process with and without heat integration were proposed. Based on the minimum total annual cost(TAC) and energy consumption, simulations for the each kind of distillation process were performed by Aspen Plus software, and the optimal operating parameters and plant parameters were determined. The simulation results showed that the MVR heat-pump distillation can save energy by 50% and total annual cost by 61% respectively compared with the conventional order separation process. Both of the MVR heat-pump distillation with and without heat integration have the same excellent performance in energy saving and annual total cost saving, but the former can improve the thermodynamic efficiency by 9.5%.

Key words: mixed alcohol, mechanical vapor recompression(MVR), heat-pump distillation, heat integration, annual total cost, energy consumption