Abstract:

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.