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System and method for controlling air-separating tower dynamic matrix

A dynamic matrix control and dynamic matrix technology, applied in distillation regulation/control, refrigeration and liquefaction, liquefaction and other directions, can solve the problems of strong, inability to adapt to the dynamic characteristics of air separation operation, and inability to obtain good control effects.

Inactive Publication Date: 2009-08-26
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the shortcomings of the existing air separation tower control schemes that cannot adapt to the dynamic characteristics of the air separation operation, strong nonlinearity, and coupling between loops, and cannot obtain good control effects, the present invention provides a control scheme that can adapt to air separation. The dynamic characteristics of the separation operation, the strong nonlinearity, and the coupling between the loops, the dynamic matrix control system and method for controlling the air separation tower with good comprehensive effects

Method used

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  • System and method for controlling air-separating tower dynamic matrix
  • System and method for controlling air-separating tower dynamic matrix
  • System and method for controlling air-separating tower dynamic matrix

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Embodiment 1

[0080] refer to Figure 1 ~ Figure 4 , a dynamic matrix control system for an air separation tower, comprising an on-site smart instrument 2 directly connected to an air separation tower 1, a data storage device for storing historical data, and a host computer 6, the smart instrument 2, a data storage device, and a host computer 6 are connected in turn, and the host computer 6 is a dynamic matrix controller, and the dynamic matrix controller includes a composition inference control part and a dynamic matrix control part, and the composition inference control part includes: a detection instrument module 7, Including temperature detection element and pressure detection element, used to detect the temperature and pressure of the upper tower of the air separation tower; I / O element module 9, used for electrical signals, and data signals in the controller and between the controller and DCS Transmission, component deduction module 10, used to infer components according to the temper...

Embodiment 2

[0190] refer to Figure 1 ~ Figure 4 , a kind of control method realized with the dynamic matrix control system of described air separation tower, described control method comprises the following steps:

[0191] (1) Determine the two-component set value Y of the air separation tower 1set 、X nset , and the sampling period T;

[0192] (2) At each sampling time KT, the composition is inferred based on the temperature and pressure data obtained from the detection, and the formulas are (1), (2):

[0193] Y 1 = α α - 1 - 10 ( a - b T 1 + c ) ...

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Abstract

A dynamic matrix control system for an air separation tower, comprising an on-site smart instrument directly connected to the air separation tower, a data storage device for storing historical data, and a host computer, and the smart instrument, the data storage device, and the host computer are connected in sequence, and the The upper computer is a dynamic matrix controller, and the dynamic matrix controller includes a composition deduction control part and a dynamic matrix control part, and the composition deduction control part includes a detection instrument module, an I / O component module and a composition deduction Module, the dynamic matrix control part includes I / O element module, prediction model module, feedback correction module, rolling optimization module and control output module. And a control method realized by the dynamic matrix control system of the air separation tower is provided. The invention can adapt to the dynamic characteristics, strong nonlinearity and coupling between loops of the air separation operation, and has good comprehensive control effect.

Description

(1) Technical field [0001] The invention relates to the field of control system and method design of an air separation tower, in particular, to a dynamic matrix control system and method of an air separation tower. (2) Background technology [0002] The air separation plant is a device that separates the air and obtains 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. [0003] 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 control. Comp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25J3/04B01D3/42
Inventor 刘兴高
Owner ZHEJIANG UNIV
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