General model connecting system of air separation tower and method thereof

A model control, air separation tower technology, applied in the direction of distillation adjustment/control, refrigeration and liquefaction, liquefaction, etc., can solve the problems of not being able to adapt to the dynamic characteristics of air separation operation, not getting good control effect, strong nonlinearity, etc.

Inactive Publication Date: 2009-07-08
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 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. A general model control system and method for an air separation tower that can obtain good control effects due to the dynamic characteristics of the separation operation, strong nonlinearity, and coupling between loops

Method used

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  • General model connecting system of air separation tower and method thereof
  • General model connecting system of air separation tower and method thereof
  • General model connecting system of air separation tower and method thereof

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Embodiment 1

[0055] refer to Figure 1 to Figure 4 , a general model control system for an air separation tower, including an on-site intelligent instrument 2 directly connected to an air separation tower 1, a data storage device for storing historical data, and a host computer 6, an intelligent instrument 2, a data storage device, and an upper computer 6 are connected in sequence, and the host computer 6 is a general model controller, and the general model controller includes a composition inference control part and a general model 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 ...

Embodiment 2

[0117] refer to Figure 1 to Figure 4 , a kind of control method realized with the general model control system of described air separation tower, described control method comprises the following steps:

[0118] (1) Determine the two-component set value Y of the air separation tower 1set 、X nset , and the sampling period T;

[0119] (2) After doing a step test around the set value, the historical data is obtained from the data storage device, obtained through the quadratic curve fitting module, and the nitrogen component Y in the nitrogen gas 1 The quadratic equation about the reflux R of the lower tower liquid nitrogen and liquid oxygen to the upper tower: Y 1 (k)=a 1 ×R(k) 2 , and the quadratic equation of the nitrogen component Xn in the product liquid oxygen with respect to the output flow L of the liquid oxygen product: X n (k)=a 2 ×L(k) 2 ;

[0120] (3) At each sampling time KT, the composition is inferred based on the temperature and pressure data obtained from...

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Abstract

A general model control system of an air separation tower, comprising an on-site intelligent instrument directly connected to the air separation tower, a data storage device and a host computer for storing historical data, and the intelligent instrument, the data storage device and the upper computer are connected in sequence, the described The upper computer is a general model controller, and the general model controller includes a component inference control part and a general model control part, and the composition inference control part includes a detection instrument module, an I / O component module and a component inference Module, the general model control part includes I / O component module, quadratic curve fitting module, general model control operation module and control output module. And a control method realized by the general model control system of the air separation tower is provided. The invention can adapt to the dynamic characteristics, strong nonlinearity and coupling between loops of air separation operation, and can obtain good 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 general model 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. Compl...

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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