High-purity nonlinear control system and method for internal thermal coupling rectifying tower

An internal thermal coupling and non-linear control technology, applied in the direction of distillation adjustment/control, comprehensive factory control, electrical program control, etc., can solve problems such as poor control effect and poor ability to suppress interference

Inactive Publication Date: 2012-03-07
ZHEJIANG UNIV
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  • Application Information

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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 high-purity nonlinear control system with good interference suppression ability and good control effect for the internal thermal coupling rectification tower System and method

Method used

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  • High-purity nonlinear control system and method for internal thermal coupling rectifying tower
  • High-purity nonlinear control system and method for internal thermal coupling rectifying tower
  • High-purity nonlinear control system and method for internal thermal coupling rectifying tower

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Embodiment 1

[0060] refer to figure 1 , figure 2 , a high-purity non-linear control system 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 includes a storage device 4, a control station 5 and The upper computer 6, the field smart instrument 2 is connected with the storage device 4, the control station 5 and the upper computer 6 successively through the field bus and the data interface 3; The temperature and pressure data of the 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, and the host computer includes a control variable value for calculating and outputting the internal thermally coupled rectification tower A high-purity nonlinear controller, the high-purity nonlinear controller includes a component inference modu...

Embodiment 2

[0084] refer to figure 1 with figure 2 , a high-purity nonlinear control method of an internal thermally coupled rectification tower, the control method comprising the following steps:

[0085] 1) Determine the sampling period T, and compare the T value, the relative volatility α, the stripping section pressure P s , Antonie constants a, b, c are stored in the historical database;

[0086] 2) Set the control law parameter K 1 , K 2 , K 3 , K 4 and the set value Y of the vapor phase light component concentration at the top of the tower 1 * , The set value of the liquid phase light component concentration at the bottom of the column X n * ;

[0087] 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:

[0088] X ...

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Abstract

The invention provides a high-purity nonlinear control system for an internal thermal coupling rectifying tower, which comprises an on-site intelligent instrument directly connected with the internal thermal coupling rectifying tower and a DCS system, wherein the DCS system comprises a storage device, a control station and an upper computer; the on-site intelligent instrument is connected with the storage device, the control station and the upper computer; and the upper computer comprises a high-purity nonlinear controller used for computing and outputting an internal thermal coupling rectifying tower control variant, which comprises a component deduction module, a reference track computing module and a high-purity nonlinear control law resolution module. The invention also provides a high-purity nonlinear control method for the internal thermal coupling rectifying tower. The control system and the control method, which are provided by the invention, can well process the strong nonlinear characteristics of the a high-purity thermal coupling energy-saving rectifying tower and have high-efficiency online operation speed and an excellent servo tracking control effect and an excellentinterference inhibition effect.

Description

technical field [0001] The invention relates to the problem of design of a rectification tower energy-saving control system and method, and in particular proposes a high-purity 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 sav...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D3/14B01D3/42G05B19/418
CPCY02P90/02
Inventor 刘兴高周叶翔
Owner ZHEJIANG UNIV
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