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Nonlinear control system and method for internal thermally coupled distillation column

An internal thermal coupling and non-linear control technology, applied in the direction of total factory control, total factory control, electrical program control, etc., 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 thermal coupling rectification tower control method, the present invention provides a non-linear Control system and method

Method used

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  • Nonlinear control system and method for internal thermally coupled distillation column
  • Nonlinear control system and method for internal thermally coupled distillation column
  • Nonlinear control system and method for internal thermally coupled distillation column

Examples

Experimental program
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Effect test

Embodiment 1

[0058] refer to figure 1 with figure 2 , a nonlinear control system and method for an internal thermally coupled rectification tower, the control system includes an on-site intelligent instrument 2 and a DCS system 13 directly connected to the internal thermally coupled rectification tower, and the DCS system 13 includes a storage device 4, a control Station 5 and host computer 6, described field smart instrument 2 is connected with storage device 4, control station 5 and host computer 6 through field bus and data interface 3 successively; Obtain 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, and the host computer includes an internal thermal coupling rectification column for calculating and outputting A nonlinear controller controlling variable values, said nonlinear controller comprising a component inference module 9, a r...

Embodiment 2

[0081] refer to figure 1 with figure 2 , a nonlinear control method of an internal thermally coupled rectification tower, the control method comprising the following steps:

[0082] 1) Determine the sampling period t, and compare the value of t, the relative volatility α, the pressure of the stripping section P s , Antonie constants a, b, c are stored in the historical database;

[0083] 2) Set the control law parameter K 1 , K 2 , K 3 , K 4 and the vapor phase light component concentration Y at the top of the column 1 * , the set value of the concentration of light components in the liquid phase at the bottom of the column X n * ;

[0084] 3) Obtain the pressure P of the rectification section at k sampling time 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:

[0085] X i ...

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Abstract

The invention discloses a nonlinear control system for an internal thermally coupled distillation column. The system comprises a filed 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 filed intelligent instrument is connected with the storage device, the control station, and the upper computer; the upper computer comprises a nonlinear controller which is used for calculating and outputting the control variable value of the internal thermally coupled distillation column; and the nonlinear controller comprises a component deduction module, a reference trajectory calculation module, and a nonlinear control law solving module. The invention also provides a 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 internal thermally coupled energy-saving 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 design problem of a rectification energy-saving control system and method, and in particular proposes a nonlinear control system and method for an internal heat-coupled rectification tower. Background technique [0002] The rectification process is a core process in the chemical process, and the rectification column is one of the key units. 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 e...

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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