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Hybrid control problems of coal flotation process |
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Hybrid control problems of coal flotation process Author: R. Kaula
In Poland, the most often used control systems of a coal flotation process are based on a doses stabilization system. An operation of this system is limited to the stabilization of reagent doses, based on measurements of concentration and feed flow intensity. In practice, the flotation process is running under conditions of different industrial disturbances. These are reasons that doses stabilization system, in many cases, doesn't stabilize the process qualitative parameters. This problem can be solved by the feedback control system. In order to practically use formulated control algorithms, it is necessary to determine dynamic models describing the input and output behaviour of the flotation process. High changes of mineral characteristics and plant properties can be a cause of significant changes of model parameters. It can makes that sensitivity limits of a conventional control system will stay overflow. In order to ensure a required control quality, there is necessary to tune control algorithm during algorithms realization. It can be realized by a hybrid control system. In the paper rules for a design of the hybrid control system have been presented. Basic assumptions of the hybrid control system have been given. A fuzzy logic for description of dynamic models of coal flotation process has been applied. The analytical examples of dynamic models parameters determining based on a knowledge base system have been presented. A numerical example a formation of the flotation process dynamic model has been shown.
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2011