Design method of dynamic optimization control layer output constraints of dilute acetone rectification industry

Abstract

The invention discloses a design method of dynamic optimization control layer output constraints of a dilute acetone rectification industry. The method comprises the following steps: Step one, for a dilute acetone rectification industrial model predication control system with a double-layer structure, solving a gain model of a stable-state optimization layer of a model prediction controller; step two, finding out uncertain elements in a process gain matrix in the gain model; step three, according to the uncertain elements and system interference variables, solving an upper boundary of an output constraint reachable set and a lower boundary of the output constraint reachable set; and step four, according to the upper boundary of the output constraint reachable set and the lower boundary of the output constraint reachable set, obtaining the dynamic optimization control layer output constraints. The design method of the dynamic optimization control layer output constraints of the dilute acetone rectification industry, provided by the invention, is applied to a non-regular uncertain system, guarantees the solution feasibility of the dynamic optimization control layer model prediction controller and enables the benefits of enterprises to be maximized.

Description

technical field [0001] The invention relates to the field of industrial control, in particular to a design method for dynamically optimizing the output constraints of a control layer in the rectification industry of propylene glycol. Background technique [0002] Acetone is one of the important basic organic raw materials, mainly used in the manufacture of cellulose acetate films, plastics and paint solvents. In different applications, acetone is required to have different purity, sometimes it is required to be of high purity, even anhydrous acetone, but this is very difficult, because acetone is extremely volatile and soluble, so, I want to It is often very difficult to obtain high-purity acetone. [0003] In order to raise the low-purity acetone aqueous solution to high-purity, continuous distillation is generally used. The rectification operation in the chemical plant is carried out in a vertical circular rectification column, which is equipped with several layers of tr...

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Problems solved by technology

[0005] In the acetone distillation industry, combined with the production needs of enterprises, the use of double-layer structure model predictive control for production control can maximize the profit of enterprises. The control system of diacetone distillation industry is often non-square and uncertain. When encountering a non-square uncertain system, the output constraints of its dynamic optimization control layer are difficult to determine

At present, there have been extensive researches on the output constraint design of non-square deterministic systems in the world, but there are few studies on the output constraint design of such non-square uncertain systems in the distilling industry of diacetone

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