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首页> 外文学位 >A STUDY ON ADVANCED CONTROL FOR AN INDUSTRIAL SCALE DISTILLATION COLUMN: MODEL DEVELOPMENT AND CONTROL SIMULATIONS.
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A STUDY ON ADVANCED CONTROL FOR AN INDUSTRIAL SCALE DISTILLATION COLUMN: MODEL DEVELOPMENT AND CONTROL SIMULATIONS.

机译：工业规模蒸馏塔的高级控制研究：模型开发和控制仿真。

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摘要

This thesis describes the research that was performed to investigate the modelling and control of an industrial scale distillation column located at The Dow Chemical Company's Michigan Division. The overall objective of this thesis was to determine if advanced control would be beneficial to the column under study. This objective led to two major themes in the research: (1) develop a dynamic, multivariable model of the column, and (2) propose an alternate model based control scheme and test it through simulation.;Least squares parameter estimation of the identified model is based on real operating data. It was found that the concentration on the 57th tray exhibited inverse response to changing reflux flow. This was totally unexpected and has not been mentioned in the chemical engineering literature. Discussion of the Linde column model shows that other aspects of the model were very consistent with the experience of the operating personnel.;The alternate control strategy selected is a feedforward version of Internal Model Control, IMC. Two peculiarities of the column required extensions of existing theory on IMC, they are: (1) multirate sampling of the two product concentrations and (2) the inverse response already mentioned. The multirate sampling problem is addressed by a unique implementation of feedforward control. A reduced order controller design technique is developed to handle the non-minimum phase behavior.;The multivariable controller out performs the conventional controllers in load change simulations. Improved disturbance rejection was achieved in both product streams.;The model that is developed is a 2 input, 2 output matrix of discrete time transfer functions. A novel identification procedure is developed which greatly reduces the number of parameters necessary to describe the behavior of multivariable systems with multiple time delays and is based on a new "delayed polynomial matrix" representation of discrete systems. A computer algorithm for the delayed polynomial matrix method is described in a way that makes it suitable for interactive use. A simulated example demonstrates the ability of this new identification method to perform with up to 20% additive noise on the data.
机译：本文描述了为调查位于陶氏化学公司密歇根分部的工业规模蒸馏塔的建模和控制而进行的研究。本文的总体目标是确定先进的控制方法是否对研究中的色谱柱有利。该目标导致了研究的两个主要主题：（1）开发一种动态的多变量色谱柱模型；（2）提出一种基于模型的替代控制方案并通过仿真对其进行测试。;所识别模型的最小二乘参数估计基于真实的运行数据。发现第57个塔盘上的浓度对改变的回流流量表现出相反的响应。这是完全出乎意料的，化学工程文献中没有提及。对Linde列模型的讨论表明，该模型的其他方面与操作人员的经验非常一致。所选的替代控制策略是内部模型控制（IMC）的前馈版本。该列的两个特点需要对IMC的现有理论进行扩展，它们是：（1）两种产品浓度的多速率采样；（2）已经提到的逆响应。前馈控制的独特实现解决了多速率采样问题。开发了降阶控制器设计技术来处理非最小相位行为。多变量控制器在负载变化模拟中可以执行常规控制器。在两个产品流中均实现了改善的抗干扰能力。所开发的模型是离散时间传递函数的2输入2输出矩阵。开发了一种新颖的识别程序，该程序大大减少了描述具有多个时间延迟的多变量系统的行为所需的参数数量，并且该方法基于离散系统的新“延迟多项式矩阵”表示。描述了一种用于延迟多项式矩阵方法的计算机算法，使其适合交互式使用。一个模拟示例演示了这种新的识别方法能够对数据执行高达20％的附加噪声的性能。

著录项

  • 作者

    WASSICK, JOHN MARTIN.;

  • 作者单位

    Michigan State University.;

  • 授予单位 Michigan State University.;
  • 学科 Engineering Chemical.;Engineering Electronics and Electrical.
  • 学位 Ph.D.
  • 年度 1987
  • 页码 178 p.
  • 总页数 178
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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