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

An internal thermal coupling, nonlinear control technology, applied in the direction of comprehensive factory control, comprehensive factory control, electrical program control, etc., can solve problems such as poor interference suppression ability and poor control effect.

Inactive Publication Date: 2010-11-17
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 disadvantages 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 self- Adaptive nonlinear control system and method

Method used

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

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Embodiment 1

[0074] refer to figure 1 , figure 2 , an internal heat-coupled rectification tower ultra-high-purity self-adaptive nonlinear control system, the control system includes field intelligent instruments 2 and a DCS system directly connected to the internal heat-coupled rectification tower, and the DCS system includes a storage device 4, a control Station 5 and host computer 6, wherein the on-site intelligent instrument is connected with the storage device 4, the control station 5 and the host computer 6 through the field bus and the data interface 3; the intelligent instrument is used to realize the function of the detection module 7, that is, to detect the internal The temperature and pressure data of the thermally coupled rectification tower, 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 the internal thermally coupled rectification tower control variable for calculating the output An ul...

Embodiment 2

[0105] refer to figure 1 with figure 2 , an ultra-high-purity self-adaptive nonlinear control method for an internal thermally coupled rectification column, the control method comprising the following steps:

[0106] 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;

[0107] 2) Set the control law parameter k j1 , k j2 and the set value of the concentration of light components in the liquid phase at the top and bottom of the tower X 1 * , X n * ;

[0108] 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 j , to calculate the concentration of light components in the liquid phase, and use formula (1) (2) to get:

[0109] X j = P r ×...

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Abstract

The invention relates to an ultra-pure self-adaptive nonlinear control system for an internal thermally coupled distillation column. The system comprises a field intelligent instrument and a distributed control system (DCS) which are directly connected with the internal thermally coupled distillation column, wherein the DCS 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; and the upper computer comprises an ultra-pure self-adaptive nonlinear controller which is used for calculating and outputting control variable values of the internal thermally coupled distillation column and comprises a component deduction module, a self-adaptive parameter correction module and an ultra-pure self-adaptive nonlinear control law solving module. The invention also provides an ultra-pure self-adaptive nonlinear control method for the internal thermally coupled distillation column. The control system and the method of the invention can well overcome the strong nonlinear characteristics of the ultra-pure internal thermally coupled distillation column, and have high on-line operational speed, and good servo tracking control effect and interference suppression effect.

Description

technical field [0001] The invention relates to the design of a rectification energy-saving control system and method, and in particular proposes an ultra-high-purity self-adaptive nonlinear control system and method for an internal thermally 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 pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/418
CPCY02P90/02
Inventor 刘兴高周叶翔
Owner ZHEJIANG UNIV
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