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 getting good control effect, not being able to adapt to the dynamic characteristics of air separation operation, strong nonlinearity, etc.

Inactive Publication Date: 2007-08-15
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. 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

[0060] With reference to Fig. 1~Fig. 4, the general model control system of a kind of air separation tower, comprises the scene intelligent instrument 2 that is directly connected with air separation tower 1, is used to deposit the data storage device of historical data and upper computer 6, intelligent instrument 2, The data storage device and the upper computer 6 are connected in sequence, and the upper 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 : 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 control The transmission between the device and the DCS, the composition inference module...

Embodiment 2

[0127] With reference to Fig. 1~Fig. 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:

[0128] (1) Determine the two-component set value Y of the air separation tower 1set 、X nset , and the sampling period T;

[0129] (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 ;

[0130] (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 mode control system of space dividing tower comprises an on-site intelligent device connected with the space dividing tower, a data storage device for storing history data, and a superior machine, wherein the intelligent device, data storage device and superior are serially connected, the superior machine is general mode controller comprising a component controller and a general mode controller. The component controller comprises a checking module, an I / O module, and a component analyzing module. The general mode controller comprises an I / O module, a secondary curvature simulating module, a general mode controlling calculating module and a control output module. The invention also provides a relative control method. The invention can be applicable for the dynamic, non-liner and couple properties of space dividing operation, to obtain better 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 Applications(China)
IPC IPC(8): F25J3/04B01D3/42
Inventor 刘兴高
Owner ZHEJIANG UNIV
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