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.
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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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