A novel method for optimally integrating the flow sheet of an azeotropic distillation system was proposed based on the logical relationship of Petri Nets structure. Firstly, according to the concepts of Petri Nets, the unit operation topology modules were established, i.e., the modules of distillation, decantation and mixing modules;Then the superstructure of the azeotropic distillation system which embed all the feasible flow sheets was built up to generate Petri Nets correlation matrix, and thereby the corresponding state equation was constructed. An objective function was set up with the consideration of minimizing the number of operation units, then optimal feasible flow sheets of azeotrope separation were derived by solving 0-1 integer linear programming. Finally, by comparing the results in ease study with the ones in literatures, the advantage of proposed method were illustrated as follows: the superstructure is complete, the mathematic model is precise, and the solving algorithm is efficient.%基于Petri Nets结构逻辑关系提出共沸精馏系统最优路径集成方法.首先,根据Petri Nets概念拓扑操作单元模块,即精馏、分相与混合模块;然后,建立共沸精馏系统可行操作路径超级结构,从而形成Petri Nets关联矩阵并构造状态方程,考虑最小操作数建立目标函数,进而通过求解0-1整数线性规划,得到分离共沸物最优操作路径;最终,通过实例计算结果与文献的对比,阐述了方法具有超级结构完备,数学模型精确,求解算法高效的优势.
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