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Ultra-pure nonlinear control system and method for internal thermally coupled distillation column

An internal thermal coupling and nonlinear control technology, applied in the field of ultra-high-purity nonlinear control systems, can solve problems such as poor control effect and poor ability to suppress interference

Inactive Publication Date: 2010-11-10
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the shortcomings of poor interference suppression ability and poor control effect of the existing internal thermally coupled rectification tower control system, the present invention provides an ultra-high-purity nonlinear Control system and method

Method used

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  • Ultra-pure nonlinear control system and method for internal thermally coupled distillation column
  • Ultra-pure nonlinear control system and method for internal thermally coupled distillation column
  • Ultra-pure nonlinear control system and method for internal thermally coupled distillation column

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Experimental program
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Effect test

Embodiment 1

[0057] refer to figure 1 and figure 2 , an ultra-high-purity nonlinear control system for an internal thermally coupled rectification tower, the control system includes field intelligent instruments 2 and a DSC system 13 directly connected to the internal thermally coupled rectification tower, the DCS system 13 includes a storage device 4, a control station 5 and host computer 6, wherein, field intelligent meter 2 is connected with storage device 4, control station 5 and host computer 6 successively through field bus and data interface 3; The temperature and pressure data of the internal thermal coupling rectification column, the data interface is used to realize the function of the I / O module 8, that is, the input and output of data; the host computer includes an internal thermal coupling rectification column control for calculation and output An ultra-high-purity nonlinear controller for variable values, the ultra-high-purity nonlinear controller includes a component deduc...

Embodiment 2

[0080] refer to figure 1 and figure 2 , an ultra-high-purity nonlinear control method of an internal thermally coupled rectification tower, the control method comprising the following steps:

[0081] 1) Determine the sampling period, and compare the relative volatility α, the pressure of the stripping section P s , Antonie constants a, b, c are stored in the historical database;

[0082] 2) Set the control law parameter K12 , K 11 , K 10 , K 22 , K 21 , K 20 and the set value Y of the concentration of the vapor phase product at the top of the tower 1 * , the set value of the concentration of light components in the bottom liquid phase X n * ;

[0083] 3) Obtain the pressure P of the rectification section from the smart instrument r Pressure in the stripping section P s , and each tray temperature T i , to calculate the concentration of light components in the liquid phase, and use formula (1) (2) to get:

[0084] X i = ...

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Abstract

The invention discloses an ultra-pure nonlinear control system for an internal thermally coupled distillation column. The system comprises a field intelligent instrument and a DCS system which are directly connected with the internal thermally coupled distillation column, wherein the DCS system comprises a storage device, a control station, and an upper computer; the field intelligent instrument is connected with the storage device, the control station, and the upper computer; the upper computer comprises an ultra-pure nonlinear controller which is used for calculating and outputting the control variable value of the internal thermally coupled distillation column; and the ultra-pure nonlinear controller comprises a component deduction module, a reference trajectory calculation module, and an ultra-pure nonlinear control law solving module. The invention also provides an ultra-pure nonlinear control method for the internal thermally coupled distillation column. The control system and the control method can well process the strong nonlinear characteristics of the ultra-pure internal thermally coupled distillation, and have efficient online operating rate and extremely good servo tracking control effect and interference suppression effect.

Description

technical field [0001] The invention relates to the problem of rectification energy-saving control system and method design, and in particular proposes an ultra-high-purity nonlinear control system and method with an internal heat-coupled rectification tower. Background technique [0002] Distillation column is a key operating unit in chemical process. For a long time, the rectification column has become the focus of research in the field of international distillation because of its high energy consumption and low energy efficiency. At present, there are two main solutions to the energy consumption problem in the rectification process: one is to design a new structure, which uses heat coupling to realize energy reuse to achieve energy saving purposes; the other is to design a high-efficiency distillation process control strategy to improve product quality and reduce waste So as to achieve the purpose of energy saving. Although many experimental studies have proved that the...

Claims

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Application Information

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IPC IPC(8): G05B19/418
CPCY02P90/02
Inventor 刘兴高周叶翔
Owner ZHEJIANG UNIV
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