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Non-liner control system of space-division king-tower and method

A non-linear control and control method technology, applied in the field of control system and method design of the main air separation tower, can solve the problem that the linear control scheme is difficult to obtain the control effect and the like

Inactive Publication Date: 2010-11-10
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the complex dynamic characteristics of the existing air separation main tower, the strong nonlinearity and the strong coupling between the loops, the traditional methods such as PID and other linear control schemes are difficult to obtain better control effects. The invention provides a nonlinear control system and method of the air separation main tower that can adapt to the dynamic characteristics of the air separation main tower, strong nonlinearity and coupling between loops, and provide good control effects

Method used

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  • Non-liner control system of space-division king-tower and method
  • Non-liner control system of space-division king-tower and method
  • Non-liner control system of space-division king-tower and method

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Experimental program
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Effect test

Embodiment 1

[0047] refer to Figure 1 ~ Figure 3 , a non-linear control system of the air separation main tower, including an on-site intelligent instrument 2 directly connected with the air separation main tower 1, a database for storing historical data, and a host computer 6, and the intelligent instrument 2, the database, and the host computer 6 in sequence connected. The upper computer 6 is a nonlinear controller, and the nonlinear controller includes:

[0048] The composition deduction module 10 is used to deduce the composition according to the detected temperature and pressure data, and the formulas are (1), (2):

[0049] Y 1 = α α - 1 - 10 ( a - b T 1 + ...

Embodiment 2

[0099] refer to Figure 1 ~ Figure 3 , a nonlinear control method for the air separation main tower, which is realized according to the following steps:

[0100] The first part, system initialization

[0101] 1) Set the two-component set value Y of the upper tower product of the air separation main tower in the nonlinear controller 6 1set , X nset , and the system sampling period.

[0102] 2) Set the process state parameters of the nonlinear model predictive control module; by using the mechanism equation to write the nonlinear differential equation model, the following approximate process model description can be obtained:

[0103] x&(t)=f(x(t), z(t), u(t), p) (3)

[0104] 0=g(x(t), z(t), u(t), p) (4)

[0105] Contains two kinds of equations, differential equations f, and algebraic equations g, the parameter vector is defined as p, where x&(t) is the first derivative of the differential variable, x is the differential variable, z is the algebraic variable, and u is the c...

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Abstract

The invention discloses a non-liner control system of a space division main tower and a method, comprising an on-site intelligent instrument, a database and an upper computer, wherein the on-site intelligent instrument is directly connected with the space-division king-tower, the database is used for storing historical data, and the on-site intelligent instrument, the database and the upper computer are successively connected; the upper computer comprises a non-liner controller which utilizes non-liner dynamic optimized on-line operation to obtain an output value of a control variable at present; the non-liner controller comprises a component deduction module and a non-liner model prediction control module. In addition, the invention provides a non-liner control method of the space-division king-tower. Compared with the control system, such as traditional PID and the like, the invention not only realizes the stable operation of two-end components and has better dynamic control effect.

Description

technical field [0001] The invention relates to the field of control system and method design of an air separation main tower, in particular, to a nonlinear control system and a method for an air separation main tower. Background technique [0002] The air separation plant is a device used to separate the components in the air to obtain high-purity industrial gases such as oxygen, nitrogen, and argon. It is a supporting unit operation of many industries related to the lifeline of the national economy, such as chemical industry, metallurgy, electronics, energy, aerospace, food and beverage, etc. An important indicator of the level of development. Air separation operation is a complex process involving low temperature, multi-equipment, long process, complex operation and high safety production requirements. In production, the purity of oxygen, nitrogen, and argon products is often required to be as high as 99%, which belongs to the problem of high-purity rectification contro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/418G05B13/04
CPCY02P90/02
Inventor 刘兴高王成裕
Owner ZHEJIANG UNIV
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