一种适用于质量交换网络优化的节点非结构模型

A node unstructured model for mass exchange network optimization

质量交换网络(MEN)作为过程集成系统的新兴分支方向,具有提高资源利用效率和降低环境污染的双重效益。目前典型的超结构模型在MEN优化中已经取得了很好的应用,但超结构固定排列方式限制了模型中换热器匹配的灵活性和求解域的扩大。基于此,提出了一种新的有分流节点非结构模型,以节点的形式量化传质单元的匹配方式,实现传质单元在流股上的自由匹配,从而增强了单元匹配的灵活性。同时考虑到实际工程中有分流情况的出现,以分组数和分支数表示传质单元的有分流形式,进一步扩大了模型的求解范围。最后,通过2个实际MEN算例分析计算,验证了有分流节点非结构模型的有效性。

As a new branch of process integration system,mass exchange network(MEN)has the dual benefits of improving resource utilization efficiency and reducing environmental pollution.At present,the typical superstructure model has been well applied in MEN optimization,but the fixed arrangement of superstructure limits the flexibility of heat exchanger matching and the expansion of solution domain in the model.A new unstructured model with shunting nodes was proposed.The matching mode of mass transfer unit was quantified in the form of nodes,the free matching of mass transfer unit on the stream strand was realized and the flexibility of unit matching was enhanced.At the same time,considering the appearance of diversion in practical engineering,the diversion form of mass transfer unit was expressed by the number of groups and branches,which further expanded the solution range of the model.Finally,through the analysis and calculation of two actual MEN examples,the effectiveness of the unstructured model with split nodes was verified.