关键词: 模型, 动态建模, 聚合, 三阶段模型, 牌号切换过程

Abstract: Grade transition processes are critical for saving energy in polymerization, however, the traditional models do not pay much attention to the transitional process due to insufficiency of quality data. Therefore, based on the previous work of the three-stage decomposition modeling method, the overall process is further dealt with. In the polypropylene process, there are stable production processes for a single grade and grade transitional processes between two different grades. As these two kinds of processes have different dynamic characteristics, it is reasonable to divide data into different sub-domains according to different dynamic processes and develop sub-models in every domain. In this paper, construct ensemble of models based on different dynamic processes and a discriminant model to detect the beginning and completion of the transition were proposed. Finally, the proposed model was applied to industrial plant data and its higher prediction performance was verified, compared with a single model.

Key words: model, dynamic modeling, polymerization, three-stage model, grade transitional process