Abstract
The paper presents the results of simulation tests of the dynamic characteristics of a three-product jig for coal separation and control systems for refuse discharge. The changes in the position of the stratified bed layers and the density of the separation layer in the product discharge zone as well as the static characteristics of the zone in two compartments of the jig were investigated. It was assumed that the main disturbance occurring in industrial systems are changes in the flow rate and the feed washability characteristics. The simulation model was verified in industrial tests in two coal preparation plants. An analysis of the effects of the control of the bottom product discharge system for nonlinear PI controllers and adaptive radiometric density meters with variable measurement time was carried out. The aim of control was to stabilize the density of the separation layer at the desired level. The parameters of the nonlinear PI controller depended on the direction of changes in the feed flow rate. The control effects were compared with linear control systems and meters with a constant measurement time commonly used in industry. Proposed system improves product quality and reduces product losses in waste compared to conventional systems.
Published Version
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