基于时间Petri网的循环物质流动态投入建模与仿真优化

针对循环经济园区生产企业普遍存在的物料冗余投入的问题,以时间Petri网建模与仿真技术为依托,对物质流单元模块建立了时间Petri网模型,实现了对物质流系统投入方案的优化.首先利用时间Petri网强大的符号表达优势,对物质流系统的时序性和环节间的依赖性进行了公式化表达;继而通过模型分析,用数学算法量化了在逆向循环流的约束下,单循环和多循环物质流系统的物料最优投入量和最佳投入时间点,并用时间Petri网对其进行了图形化表达;最后以青海省某盐湖企业为例,对氯化钾生产物质流进行建模分析,给出了物料投入最优时间戳,并定量计算了原料节约率.通过案例实证分析可以看出,利用时间Petri网模型对循环物质流系统建模优化后,可以大幅地提高物料利用效率,从微观层面为循环经济减量化的实施与推广提供了技术支撑.优化算法适用于大中小型循环经济企业,而对于面临"循环而不经济"问题的中小型企业更具有实施意义.

Modeling and simulate optimization for dynamic input of circular material flow based on timed-Petri net

Aiming at the problem of the redundancy investment of the material in the production enterprise of circular economy zone, the timed-Petri net model is established for the material flow element module based on the timed-Petri net and simulation technology. Firstly, the expression of the time sequence and the dependence of the material flow system are expressed; And then, using mathematical algorithms to quantify the material optimal investment amount and the optimal investment time of the cycle of material flow system through the analysis of the model; Finally, take a Saline Lake enterprise in Qinghai Province as an example, the using of the timed-Petri net model can improve the efficiency of the material utilization greatly through the empirical analysis of the case. The optimal algorithm is suitable for small and medium sized circular economy enterprise, but it is of significance for small and medium enterprises facing the problem of "cycle but diseconomy".