Predictive control system of nonlinear model of internal thermal coupled rectifying tower and method thereof

A nonlinear model, internal thermal coupling technology, used in the field of control systems for advanced rectification processes, which can solve problems such as complex dynamic characteristics

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 complex dynamic characteristics, strong nonlinearity and strong coupling between loops after the introduction of internal coupling in the existing internal thermally coupled rectification column, it is difficult to obtain better results from traditional control schemes such as PID and other linear control schemes. Insufficient control effec

Method used

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  • Predictive control system of nonlinear model of internal thermal coupled rectifying tower and method thereof
  • Predictive control system of nonlinear model of internal thermal coupled rectifying tower and method thereof
  • Predictive control system of nonlinear model of internal thermal coupled rectifying tower and method thereof

Examples

Experimental program
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Example Embodiment

[0072] Example 1

[0073] Reference Figure 1 ~ Figure 3 , A non-linear model predictive control system for an internal thermally coupled rectification column, including an on-site intelligent instrument directly connected to the internal thermally coupled rectification column 1, a database and an upper computer for storing historical data 6, an intelligent instrument 2, The database and the upper computer 6 are connected in sequence. The host computer 6 includes a non-linear model predictive controller, and the non-linear model predictive controller includes: a component inference module 10 for inferring components based on the detected temperature and pressure data, and the formula is (1 ),(2):

[0074] Y 1 = α α - 1 - 10 ( a - b T 1 + c ) ( α - 1 ) P r - - - ( 1 )

[0075] Xn = P s α 10 ( a - T n + c b ) ( α - 1 ) - 1 α...

Example Embodiment

[0140] Example 2

[0141] Reference Figure 1 ~ Figure 3 , A non-linear model predictive control method of internal thermally coupled rectification tower, implemented according to the following steps:

[0142] The first part, system initialization

[0143] 1) Set the two-component set value Y of the internal thermally coupled distillation column in the nonlinear model predictive controller 6. 1set , X nset , And the system sampling period;

[0144] 2) Set the process state parameters of the nonlinear model predictive control module. Heat transfer rate UA, the number of trays n, the number of feed trays f, the Antonian constant a, b, c, the latent heat of vaporization λ, the feed flow rate F, Feed component z f , The liquid holding capacity of the tray; by using the mechanism equation to compile the nonlinear differential equation model, the following approximate process model description can be obtained:

[0145] (3)

[0146] 0=g(x(t), y(t), u(t), p) (4)

[0147] among them, Is the ...

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Abstract

The invention provides a predictive control system of a nonlinear model of an internal thermal coupled rectifying tower, which comprises a spot intelligent instrument which is directly connected with the internal thermal coupled rectifying tower, a database which is used for storing historical data and an upper computer, wherein the spot intelligent instrument, the database and the upper computer are sequentially connected with each other; the upper computer comprises a nonlinear model predictive controller which obtains the output value of the current control variable with nonlinear dynamic optimization on-line operation; and the nonlinear model predictive controller comprises a component deducing module and a nonlinear model predictive controlling model. Compared with traditional control systems such as a PID and the like, the predictive control system not only realizes the stable operation of two-end components, but also has a better dynamic control effect.

Description

technical field [0001] The present invention relates to the field of control system and method design of advanced rectification process, in particular, relates to a nonlinear model predictive control system and method of internal thermally coupled rectification tower. Background technique [0002] Distillation is the most widely used separation method in chemical production. It utilizes the gas-liquid two-phase mass transfer and heat transfer to achieve the purpose of separation. At the same time, it is also the unit process with the largest energy consumption in the chemical industry. The energy consumption of the separation process accounts for about 40% of the entire chemical industry, and 95% of it is consumed by the distillation process. Energy saving is an important factor in chemical and petrochemical processes. High energy consumption, economic conditions, and market fluctuations are forcing every business to reduce its operating costs to a minimum. [0003] The in...

Claims

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Application Information

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IPC IPC(8): G05B19/418
CPCY02P90/02
Inventor 刘兴高王成裕
Owner ZHEJIANG UNIV
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