Abstract: To enhance the robustness of the scheduling in refinery with operational uncertainty,a novel rescheduling method based on a two-level simulation system is proposed in this paper.The lower level model with uncertainty in the tank farm is used to simulate the deviation from the original plan.And the heuristic rule is further applied to the upper level simulation model according to the disruptions from the lower level to get the conservative plan which satisfies both material and components constrains simultaneously.Subsequently,by fixing the value of binary decision variables and penalizing the simulated deviation in the MILP model,a sub-optimal solution is obtained with less computational effort.The effectiveness of the proposed rescheduling framework is illustrated through a tank farm operation case in real world refinery.

Key words: simulation, heuristic, rescheduling, optimization

摘要： 针对炼油厂操作过程中所存在的大量操作不确定性,提出了一种基于两层仿真系统的再调度方法保证了调度指令的稳定性。在下层模型中引入罐区操作的不确定干扰,并对初始优化方案进行仿真。上层仿真系统采用启发式寻优的方法,当下层干扰发生后得到保证组分和物料双重平衡的安全方案。基于此安全方案,通过固定混合整数线性优化模型中的二元变量并对方案的偏离进行惩罚从而缩小可行域快速得到局部优化解。以某炼厂罐区操作为例,验证了这一再调度策略的有效性。

关键词: 仿真, 启发式, 再调度, 优化