关键词: 蒸馏, 数学模拟, 参数识别, 动态仿真, 优化设计

Abstract: In this study, in order to optimize the distillation of aqueous ethanol solution, the steady state and dynamic model are established for the whole distillation process of the packed tower based on material balance, phase balance, normalization of each component mole fraction and heat balance.The key parameters and energy consumption of each fractional distillation operation are calculated.At the same time, in order to verify the rationality of mathematical model and theoretical calculation, Aspen Plus and Aspen Dynamics are utilized to establish a complete distillation column model, and distillation of aqueous ethanol solution is taken as the example.Taking the concentration and recovery requirements as the constraints, the minimum energy consumption as the objective function, the sensitivity of reflux ratio, distillate flow, feed flow, feed temperature, tower heating power and some other input variables are analyzed.The theoretical calculation of parameters are corrected to determine the actual operation of the operating parameters, and we obtain the optimal operation sequence of distillation of aqueous ethanol solution.

Key words: distillation, mathematical modeling, parameter identification, dynamic simulation, optimal design