石化企业物料平衡的多层次数据校正方法

Multiscale data rectification method with application to material balance in petrochemical enterprises

针对石化企业多层次物料平衡需求,提出了一种多层次数据校正方法和分层物料平衡策略。首先介绍了物料平衡的工程背景,从测量条件、数据转换和平衡流程等角度分析了企业物料平衡存在的问题和传统方法的不足。基于石化企业装置层、调度层、统计层的多层次物流管理模型,提出了多层次数据校正方法,并给出了统一的数学描述。该方法进一步引入层间约束关系作为某一层次的校正约束方程,增加了测量数据的冗余性。对于多层次数据校正的不一致性问题,提出以下策略:先进行工厂统计平衡,校正储罐收付量,再完成调度平衡,求出装置间的互供量,最后进行分装置平衡,完成全厂装置层物料平衡。该方法提高了数据校正结果的精度,降低了求解规模。仿真研究实例说明了方法的有效性。

In petrochemical enterprises,material balance results with different spatial and time scales are used for tasks of different levels.In this paper,a rectification method and a material balance strategy based on a multilevel material model are proposed for multiscale material data.First,the engineering background and analysis of traditional methods are reviewed.Then the multiscale method is formulated and rectification steps from yield accounting scale to scheduling scale and equipment scale are discussed.Additional constraints with data from other scales contribute to redundancy of measurements and consistence of data used for different tasks.Generally,measurements on higher levels are more accurate in plants.So material balance based on rectified data is carried out from high levels to lower levels.This method contributes to the accuracy of reconciliation results and reduces difficulty with solving large scale problem.A simulation example which proves the effectiveness of the method is presented.