Aspen Plus在无机盐工艺开发与设计中的应用——六水氯化镁生产过程的模拟

应用Aspen Plus软件,选择ELECNRTL物性方法和蒸发器、换热器模块对六水氯化镁生产的连续蒸发和冷却工艺进行了模拟和验证.讨论了蒸发器的气相分率以及冷却结晶的冷却终温对产品产率的影响.在综合考虑副反应、设备材质及公用工程等影响因素的基础上,以单位产品能耗最小为目标进行了优化.确定的合理操作参数为:蒸发器的压力70,kPa、气相分率0.4、换热器的冷却温度38℃.在此工艺条件下,产品产率为60.17%,单位产品总热负荷为990.75kJ/kg.通过流程模拟对不同的工艺条件进行分析获得物性数据及工艺参数,可节省设计时间和优化现有生产工艺,降低能耗.

Application of Aspen Plus in the Process Development and Design of Inorganic Salts： Process Simulation for Magnesium Chloride Hexahydrate

The process of continuous evaporation and cooling of magnesium chloride hexahydrate was simulated by using Aspen Plus software, ELECNRTL property method and the flash and heat exchanger module. The influence of the vapor fraction of the flash and the cooling temperature of cooling crystallization on the product yield was discussed. After considering the side effects, equipment materials and public work, the process was optimized aiming at minimum energy consumption per unit of product. The reasonable parameters of the process of magnesium chloride hexahydrate are that the pressure of the flash is 70 kPa, the vapor fraction of the flash is 0.4, and the cooling temperature of the heat exchanger is 38℃. Under these conditions, the product yield of magnesium chloride hexahydrate is 60.17% and the duty per unit of the product is 990.75 kJ/kg. The process simulation can save designing time, optimize existing production processes, reduce energy consumption and help analyze different process conditions.