基于在线Kriging模型的隔板塔优化方法

Optimal design for dividing wall column using online Kriging surrogate model-based optimization method

隔板塔是一种新型的精馏节能技术,但其优化设计属于混合整数非线性规划问题,优化求解困难。本文提出在线Kriging代理模型优化方法,将其应用于隔板塔年度总费用优化。与传统离线代理模型相比,本文方法采用少量的隔板塔严格模拟数据点,即可得到优化问题的最优解。计算表明,较传统离线代理模型,本文提出的在线代理模型显示了更高的准确性和有效性,可以克服传统离线代理模型优化耗时、计算量大的缺点。

Divided wall column(DWC)is a new energy-saving distillation technology.However,its optimal design is a mixed integer nonlinear programming(MINLP)problem,and it is difficult to optimize the solution.In this paper,an online Kriging surrogate model-based optimization method is proposed and applied to the total annual cost optimization of DWC.Through the proposed method,the optimal solution of the optimization problem can be obtained by a small number of rigorous simulation data points.The solution of an illustrating example shows that,compared with the traditional offline surrogate model-based optimization method,the proposed method is more advantageous in terms of accuracy and effectiveness,being able to overcome the shortcomings of the traditional offline surrogate based-model optimization,such as time-consuming and large amount of calculation.