炼油企业生产计划与公用工程多周期集成优化研究

炼油企业通常由生产过程和公用工程两部分组成。将生产计划和公用工程集成优化，不仅获得了真正的全局最优解，而且克服了传统生产计划人为制定生产过程与公用工程之间中间物流（各压力等级的蒸汽、瓦斯等）价格的缺陷，避免了蒸汽减温、减压和放空，以及炼厂气放空的经济损失和环境破坏。笔者首先采用IDEFO方法建立了生产计划与公用工程的功能模型，描述了两者之间的相互关系，然后建立了生产计划与公用工程集成的多周期混合整数线性规划模型。模型描述了装置能耗不仅与加工量相关，而且与装置的生产方案相关，更真实地反映了生产过程与能量系统之间的定量关系。还对模型进行了全厂范围内各压力等级蒸汽和燃料的平衡。笔者将建立的全厂多周期优化模型应用于中国北方的某大型炼油厂。验证了模型的有效性。

MULTIPERIOD INTEGRATION OPTIMIZATION FOR PRODUCTION PLANNING AND UTILITY SYSTEM IN REFINERY INDUSTRIES

A novel approach to the integration of production planning and energy system was represented,by which not only a real global optimization was obtained,but also the defects in the price of the intermediates,such as steam with different pressures,gas,etc,between production and utility could be overcome.IDEF0 method was employed to construct the integrated activity model,which described the interrelationship of production planning and energy system in refinery.Optimal production planning activity submodel and energy system activity submodel were detailed respectively following the integration activity model.A plant-wide multi-period planning mathematic model was proposed and three improvements were identified.First,unit energy-consumed model was not only related to the throughput of unit,but also to the operation mode of process units,to reflect the relationship of production planning and energy system quantitatively.Second,the MILP(Mixed integer linear programming) planning model of utility systems was integrated in the total sites of the refinery to keep the balance between the steams and fuel.Finally,the proposed approach was used to a real industrial example to determine the optimal mass and energy flow,which showed the model to be available.