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

A technology of internal thermal coupling and nonlinear model, applied in the field of control system of advanced distillation process, can solve complex dynamic characteristics and other problems

Inactive Publication Date: 2012-02-22
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 effect, the present invention provides an internal thermal coupling that can adapt to the dynamic characteristics of the internal thermal coupling rectification column, strong nonlinearity and strong coupling between the loops after the introduction of thermal coupling, and provide good control effect Nonlinear Model Predictive Control System and Method for Distillation Column

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

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Embodiment 1

[0073] refer to Figure 1 ~ Figure 3 , a nonlinear model predictive control system for an internal heat-coupled rectification tower, including an on-site intelligent instrument 2 directly connected to an internal heat-coupled rectification tower 1, a database for storing historical data and a host computer 6, the intelligent instrument 2, The database and the host computer 6 are connected in sequence. The upper computer 6 includes a nonlinear model predictive controller, and the nonlinear model predictive controller includes: a composition inference module 10, which is used to infer the composition according to the temperature and pressure data obtained by detection, and its formula is (1 ),(2):

[0074] Y 1 = α α - 1 - 10 ( a - b...

Embodiment 2

[0141] refer to Figure 1 ~ Figure 3 , a nonlinear model predictive control method for an internal heat-coupled distillation column, which is implemented in the following steps:

[0142] The first part, system initialization

[0143] 1) In the nonlinear model predictive controller 6, set the two-component setting value Y of the internal thermally coupled rectification column 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, number of trays n, number of feed trays f, Antony constants a, b, c, latent heat of vaporization λ, feed flow rate F, Feed component z f , the liquid holdup of the tray; by using the mechanism equation to write the nonlinear differential equation model, the following approximate process model description can be obtained:

[0145] x · ( t ) = ...

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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 computerare 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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Patent Type & Authority Patents(China)
IPC IPC(8): G05B19/418
CPCY02P90/02
Inventor 刘兴高王成裕
Owner ZHEJIANG UNIV
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