摘要
本文以某厂工业醪塔(丙酮-丁醇)为对象,阐述了如何利用目前国内外先进的UNIFAC功能团法来建立精馏过程的静态数学模型,这种功能团法为缺乏实验数据的多元系统建模提供了可能性。针对醪塔模型变量多,非线性严重,不易收敛等情况,提出了一种改进的Newton-Raphson法,保证了算法的收敛性和快速性。根据工厂实际操作数据,对模型进行参数辩识和修正,结果表明模型与塔吻合良好。基于该模型,在IBM-4381机上建立了一个可用于工厂实际操作指导的仿真系统(DISSIMU-I)。并以节能节粮为目标函数,离线优化了操作条件,为工厂提高经济效益,提供了指导。最后,文章还提出了在线优化控制的初步设想。
In this paper, the steady-state mathematical model for an industrial prefractionator is devloped. The advanced UNIFAC group method has been used for calculating-vapor-liquid equilibrium in situation where no experimenta linformation is available. A new method to apply the Newton- Raphson technique to this multivariable and nonlinear model is approached, Model quasi-coincidence has been done by parameter identification. The results show thts model is fit for industrial practice. Based on this model, a simulation system (DISSIMU-I) has been established on IBM-4381, and the optimal operating points of this prefractionator are obtained off-line by setting up energy conservation as objective function. At last a on-line optimal control system is suggested.
关键词
醪塔
数学模型
精馏过程
数字仿真
Prefraetiortator
Distillation process
Mathematical model
Simulation
Newton-Raphson technique
Quasi-coincidence
Optimization
Energy conservation
