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System for high purity control in high-efficiency energy-saving rectifying process and method thereof

A high-efficiency, energy-saving, distillation process technology, applied in the field of distillation control, can solve the problems of unsatisfactory control quality and poor control effect.

Inactive Publication Date: 2011-08-31
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 control effect and unsatisfactory control quality in the current high-efficiency rectification process, the present invention provides a high-purity control system and method for high-efficiency energy-saving rectification process with good control effect and ideal control quality

Method used

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  • System for high purity control in high-efficiency energy-saving rectifying process and method thereof
  • System for high purity control in high-efficiency energy-saving rectifying process and method thereof
  • System for high purity control in high-efficiency energy-saving rectifying process and method thereof

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Experimental program
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Effect test

Embodiment 1

[0058] refer to figure 1 , figure 2 , a high-purity control system for a high-efficiency energy-saving distillation process, including an on-site intelligent instrument 2 and a DCS system directly connected to a high-efficiency energy-saving distillation column 1, the DCS system includes a storage device 4, a control station 5 and a host computer 6, Wherein the field intelligent instrument 2 is connected with the data interface 3, and the data interface 3 is connected with the field bus, and the field bus is connected with the storage device 4, the control station 5 and the host computer 6; A high-purity controller for controlling variable values ​​of high-efficiency and energy-saving rectification towers, the high-purity controller includes a component inference module 9, a model parameter adaptive correction and fitting module 10, and a high-purity control law solution module 11 for high-efficiency and energy-saving rectification processes ;

[0059] The component inferen...

Embodiment 2

[0081] refer to figure 1 and figure 2 , a high-purity control method for a high-efficiency energy-saving rectification process, the control method includes the following steps:

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

[0083] 2) Set the control law parameter K 1 , K 2 , K3 , K 4 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 *

[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, the calculation formula is (1) (2):

[0085] X i ( k ) = ...

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Abstract

The invention relates to a system for the high purity control in a high-efficiency energy-saving rectifying process. The system comprises a field intelligent instrument and a DCS system which are connected with a high-efficiency energy-saving rectifying tower, wherein the DCS system comprises a storage device, a control station and an upper computer, the upper computer includes a high purity controller used for calculating and outputting the control variable values of the high-efficiency energy-saving rectifying tower. The high purity controller comprises a component inferring module, a modelparameter self-adaptation correcting and fitting module and a high purity control law solving module in the high-efficiency energy-saving rectifying process, wherein the component inferring module isused for acquiring temperature and pressure data from the intelligent instrument and calculating the component concentration of each tower plate of the high-efficiency energy-saving rectifying tower,the model parameter self-adaptation correcting and fitting module is used for on-line fitting model functions by using component concentration data calculated by the component inferring module in a historical database, and the high purity control law solving module in the high-efficiency energy-saving rectifying process is used for achieving the ideal change value of the current control variable based on the current component concentration data, the model functions and current operation variable values. The invention also provides a high purity control method. The invention has the advantagesof good control effect and ideal control quality.

Description

technical field [0001] The invention relates to the field of rectification control, and in particular proposes a high-purity control system and method for an efficient and energy-saving rectification process. 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 experimental studies have proved t...

Claims

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Application Information

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