大温差热敏性体系节能精馏工艺研究

Study on energy-saving distillation process for thermal sensitive system with large temperature difference

基于乙醛-水-巴豆醛-3-羟基丁醛大温差热敏体系的特点,采用合适的操作压力,控制精馏塔塔内温度,提出了多种节能精馏工艺。使用Aspen Plus流程模拟软件中的Radfrac模块模拟精馏塔,对该体系的常规精馏、带中间冷凝器的精馏以及带中间冷凝器的热集成精馏工艺进行模拟。以年总费用(TAC)和能耗为目标函数,对各种工艺参数进行优化。研究结果表明,与常规精馏工艺相比,带中间冷凝器的精馏工艺TAC节约了10. 35%,能耗相当;带中间冷凝器的热集成精馏工艺TAC节约了28. 78%,能耗节省24. 20%。带中间冷凝器的热集成精馏工艺是分离该体系的一条高效节能的路线。

Based on the large temperature difference thermal sensitive characteristics of acetaldehyde-watercrotonaldehyde-3-hydroxybutanal system,a suitable operating pressure is employed to control the temperature in the distillation column,and many kinds of energy-saving distillation processes are proposed.Radfrac module in Aspen Plus process simulation software is used to simulate the separation of the system in rectification columns respectively under conventional rectification process,rectification process with intermediate condensers,and heat integrated rectification process with intermediate condensers.The parameters of each process are optimized with total annual cost(TAC)and energy consumption as the objective functions.The results show that compared with the conventional rectification process,TAC of the rectification process with intermediate condenser is reduced by 10.35%,and the energy consumption is equivalent;TAC of the heat integrated rectification process with intermediate condenser is reduced by 28.78%,and the energy consumption is reduced by 24.20%.The heat integrated rectification process with intermediate condenser is an efficient and energy-saving route to separate the system.