炼油企业生产计划与重点装置工艺条件集成优化

Integrating refinery unit operations with production planning optimization

传统的生产计划优化由于不考虑过程装置的操作优化,从而无法保证企业生产计划层与过程操作层的全局最优.为了在获得炼油企业最优生产计划的同时,确保计划优化中重点装置的操作条件可以实现,本文建立了集成装置工艺条件的炼油企业生产计划优化模型.该模型引入常减压装置侧线产品切割点温度、催化裂化装置转化率等过程工艺条件,基于物料质量平衡、产品质量指标约束等关系,进行厂级生产计划建模与求解,确定可达的装置操作条件.应用案例中重点通过与传统常减压装置侧线收率固定的生产计划方案比较,证明在满足可达的操作条件下,集成装置工艺条件操作范围的生产计划优化模型,可以实现更高的全厂利润与更优的装置收率分布,同时优化结果对炼厂实际生产更具有指导意义.

Traditional production planning models do not consider constraints on operating conditions of the process;therefore, the total optimality of the planning site and the process site cannot be guaranteed. To achieve the total optimal production plan for the refinery enterprise by considering the operating conditions for all major units, we build an optimal production plan model for a refinery enterprise with integrated operating conditions for all major units. This mathematical model considers the cut points of the crude oil distillation unit （CDU） and the conversion of the fluid catalytic cracker （FCC）, and is incorporated with the mass balance of material, product quality constraints and the major units models with operation conditions. It is used for the total optimization for the refinery production plan while simultaneously optimizing the operating conditions of major units. A production planning model with swing CDU fractions is obtained in a case study of a real refinery. The results shows that this production planning model integrated with process operation could obtain the optimal operating conditions at the same time achieving a higher refinery profit. Besides, this model provides better guidance for the practical production.