基于Petri网的原油处理生产作业计划油罐动态分配分析

石化炼油企业采用递阶方法进行调度,以使短期调度方法在生产运作中切实可行.在上层,企业根据市场需求产生一个目标炼油计划.在下层,企业得到一个详细调度以实现目标炼油计划.在这个过程中,如何动态分配油罐将起到至关重要的作用,同时也是生产运作中的难题.为了解决这个难题,建立Petri网模型描述原油处理生产过程的行为特征.基于该模型,分析了油罐分配对目标炼油计划可实现性的影响,鉴别出那些使系统进入不可行状态的操作,并对其进行调整.这样,通过避免这样的不可行操作而提出一种实现目标炼油计划的油罐动态分配方法.最后,用一个工业实例验证了提出的方法的应用.

Dynamic tank assignment analysis for short-term scheduling of crude oil operations by using Petri net model

To make a short-term scheduling method practical, it can be done in a hierarchical way. At the upper level, a target refining schedule is created according to market demands. Then, at the lower level, a detailed schedule is to realize the target refining schedule. To make the target refining schedule realized, the key is how to dynamically assign the tanks in the plant. To solve the realizability problem of target refining schedule, a Petri net model is developed to describe the behaviors of the system. Based on this model, how tank assignment affects the realizability of a target refining schedule is analyzed and operations that lead to an infeasible state are identified and adjusted. Thus, a dynamic tank assignment method is proposed to realize a target refining schedule by avoiding such operations. A practical industrial case problem is used to show the application of the proposed method.