关键词: 相对挥发度, 热耦合精馏, 能耗, 年均总费用

Abstract: To know more about the application scope of heat-integrated distillation technology and acquire optimal column schemes, based on four binary systems with increasing relative volatility, the conventional distillation column and four heat-integrated distillation column configurations (a vapor recompression distillation column, an ideal internally heat-integrated distillation column, a simplified internally heat-integrated distillation column, a pressure-swing thermal-coupled distillation column) were optimized for minimizing total annual cost in this work with Aspen Plus. The heat-integrated distillation columns would show lower energy consumption and better economic performance when separating mixtures with close relative volatility, among which the vapor recompression and pressure-swing thermal-coupled distillation columns were the most promising ones. The conventional distillation column was an appropriate choice for mixtures of which relative volatility was relatively large. In addition, as payback period decreased, the economic advantage of heat-integrated distillation columns would also drop compared to the conventional distillation column.

Key words: relative volatility, heat-integrated distillation, energy consumption, total annual cost