Method and system for controlling high-purity rectification of rectifying tower based on generalized prediction control

A generalized predictive control and control system technology, which is applied in the field of high-purity distillation control system of rectification tower, can solve the problems of not getting good control effect, strong nonlinearity, and not being able to adapt to the dynamic characteristics of air separation operation, etc.

Inactive Publication Date: 2009-05-27
ZHEJIANG UNIV
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Problems solved by technology

[0004] In order to overcome the shortcomings of existing rectification column control schemes that cannot adapt to the dynamic characteristics of air separation operation, strong nonlinearity, and coupling between loops, and cannot obtain good control effects, the present invention provides a solution that can solve the problem of air separation The high-purity distillation control system and method of distillation tower based on generalized predictive control based on the dynamic characteristics of sub-operation, strong nonlinearity, and coupling problems between loops, and obtained good control effect

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  • Method and system for controlling high-purity rectification of rectifying tower based on generalized prediction control
  • Method and system for controlling high-purity rectification of rectifying tower based on generalized prediction control
  • Method and system for controlling high-purity rectification of rectifying tower based on generalized prediction control

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Embodiment 1

[0066] refer to figure 1 , figure 2 , image 3 , a high-purity rectification control system for a rectification column based on generalized predictive control, including an on-site intelligent instrument 2 directly connected to a rectification column 1, a data storage device for storing historical data and a host computer 6, an intelligent instrument 2, The data storage device and the upper computer 6 are connected in sequence, and the upper computer 6 is a general model controller, and the general model controller includes a composition inference control part and a general model control part, and the composition inference control part includes : detection instrument module 7, including temperature detection element and pressure detection element, used to detect the temperature and pressure of the upper tower of the rectification tower; I / O element module 9, used for electrical signals, and data signals in the controller and control The transmission between the device and t...

Embodiment 2

[0164] refer to figure 1 , figure 2 as well as image 3 , a kind of control method realized with the generalized predictive control system of described rectification column, described control method comprises the following steps:

[0165] (1) Determine the two-component setting value Y of the rectification column lset 、X nuset , and the sampling period T;

[0166] (2) At each sampling time KT, the composition is inferred based on the detected temperature and pressure data,

[0167] Its formula is (1), (2):

[0168] X D = α α - 1 - 10 ( a - b T 1 + c ) ...

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Abstract

The invention is concerned with a kind of high purity rectify control system of rectify tower based on generalized forecasting control. It relates to locale intelligent instrument connecting with distillation tower, data stored equipment for old data and upper computer. They connect with each other one by one and the upper computer is the generalized forecasting control. The said generalized forecasting control relates to component deduce and control part and generalized forecasting part, and the component deduce and control part relates to check instrument module, I / O component module and component deduce module, while the generalized forecasting part relates to I / O component module and forecasting model module, model self-revise module, rolling optimize module and control sending module. It also affords a kind of control method to generalized forecasting control system of distillation tower. This invention has good control effect to fit the dynamic character, strong nonlinear and the coupling character between loops of the distillation operation.

Description

(1) Technical field [0001] The invention relates to the field of advanced control of chemical distillation process, in particular to a high-purity distillation control system and method of a distillation column based on generalized predictive control. (2) Background technology [0002] The rectification process is a very typical and important unit process in the petrochemical production process, and its operation quality directly affects the product quality and production cost of the entire plant. Especially with the rapid development of economic globalization and technology, people have higher and higher requirements for the efficiency and precision of the distillation process. Therefore, the concept of high-purity distillation has attracted more and more attention at home and abroad, and its importance is beyond doubt. [0003] The difficulty of high-purity distillation process control mainly lies in its complex dynamic characteristics, nonlinearity, and coupling between ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D3/42
Inventor 刘兴高王成裕
Owner ZHEJIANG UNIV
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