Neural Net based Quality Modeling and Control Systems for Polymerization Processes

基于神经网络的聚合过程质量建模和控制系统

• 批准号: 05650392
• 负责人: HASHIMOTO Iori
• 金额: $ 1.09万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05650392/
• 关键词: Quality Modeling; Quality Control; On-line inference; Neural Net; Polymerization Reactor Control; quality modeling; MFR; High density Polyethylene Process; Midel predictive Control; Multilate control; Kalman Filter; SPC; quality surveillance s

In this study, an on-line inferential scheme is proposed in order to predict a polymer property, the Melt Index, form off-line, past measured values of this property and available on-line measured process variables. In the on-line inferential scheme, the L infinity wave-net, which is an artificial nenural network with basis functions drawn from the family of wavelets, is utilized by incorporating fundamentals of chemical engineering. The multistep predictor, formulated in a cascaded structure of identical one-step-ahead Wave-Net based predictors, is adaptively learning the functional relationship between the polymer property and process variables. The application of the scheme is illustrated using operating data for an industrial High Density Polyethylene Process. The results of the proposed scheme show that the inferential scheme built upon the Wave-Net can successfully predict the MI and prove its potential as an on-line monitoring scheme to maintain the polymer quality at the highest level.

在这项研究中，提出了一种在线推理方案，以预测聚合物的性能，熔体指数，离线形式，该性能的过去测量值以及可用的在线测量过程变量。在在线推理方案中，结合化学工程的基本原理，利用从小波族中提取基函数的人工神经网络l_∞波网。多步预测器是由基于波浪网的预测器组成的级联结构，可以自适应地学习聚合物性质与工艺变量之间的函数关系。以高密度聚乙烯工业生产的运行数据为例，说明了该方案的应用。结果表明，基于Wave-Net的推理方案可以成功地预测聚合物的MI，并证明了其作为在线监测方案的潜力，可以将聚合物的质量保持在最高水平。

项目成果

M.Ohshima: "Grade transition control for an impact co-polymer-ization process" Proc.of Int.Symp.on Advanced Chemical Process Control. 507-512 (1994)

M.Ohshima：“冲击共聚过程的等级转变控制”Proc.of Int.Symp.on Advanced Chemical Process Control。

橋本伊織: "プラントオペレーションとプロセス制御" 化学工学. 57. 315-319 (1993)

Iori Hashimoto：“工厂操作和过程控制”化学工程 57. 315-319 (1993)。

M.Kano: "Multirate coordinated control for chemical process" Proc.of the first Asian Control Conf.515-520 (1994)

M.Kano：“化学过程的多速率协调控制”Proc.of the first Asian Control Conf.515-520 (1994)

F.Watanabe: "Quality control system for on industrial high densitypolyethy lene process" American Institute of Chemical Engineering Advances in Process Control. 149(microfiche). (1993)

F.Watanabe：“工业高密度聚乙烯过程的质量控制系统”美国化学工程研究所过程控制进展。

F.WATANABE,M.OGAWA,M.OHSHIMA,I.HASHIMOTO: "Quality Control System for an Industrial High Density Polyethylene process" AtlhE.St.Lowis Meeting. SN-149. PN149-19 (1993)

F.WATANABE、M.OGAWA、M.OHSHIMA、I.HASHIMOTO：“工业高密度聚乙烯工艺的质量控制系统”AtlhE.St.Lowis 会议。