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Self-adaptive nonlinear control system and method for internal thermally coupled distillation column
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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 control effect and poor interference suppression ability.
Inactive Publication Date: 2012-01-25
ZHEJIANG UNIV
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[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 self-adaptive non-adaptive control method for internal thermal coupling rectification tower with good interference suppression ability and good control effect. Linear Control System and Method
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Embodiment 1
[0066] refer to figure 1 , figure 2 , an adaptive nonlinear control system for an internal thermally coupled rectification tower, the control system includes an on-site intelligent instrument 2 and a DCS system directly connected to the internal thermally coupled rectification tower, and the DCS system includes a storage device 4 and a control station 5 and the upper computer 6, wherein the on-site intelligent instrument 2, the storage device 4, the control station 5 and the upper computer 6 are connected in turn through the field bus and the data interface 3; Coupling the temperature and pressure data of the 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.
[0067] The host computer includes an adaptive nonlinear controller for calculating and outputting the control variable value of the internal thermal coupling rectification column, and the adaptive nonlinear controller includes a component...
Embodiment 2
[0094] refer to figure 1 and figure 2 , an adaptive nonlinear control method of an internal thermally coupled rectification tower, the control method comprising the following steps:
[0095] 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;
[0096] 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 * ;
[0097] 3) Obtain the pressure P of the rectification section at k sampling time from the on-site 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:
[0098] ...
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Abstract
The invention relates to a 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 a 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 model parameter correction module and a self-adaptive nonlinear control law solving module. The invention also provides a 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 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 problem of a rectification energy-saving control system and method, and in particular proposes an adaptive 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. Altho...
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