An Automatic Control System of Suspension Density in Dense Medium Cyclone Separation Process

Abstract

The invention mainly belongs to the field of dense medium cyclones of coal preparation plants and particularly relates to an automatic control system for the suspension density in a separation process of a dense medium cyclone. The control system comprises a controller and an actuator. The actuator comprises a water replenishing valve and a diverter valve which are mounted on the dense medium cyclone. The controller controls the opening of the valves of the actuator in real time for automatically controlling the suspension density in the separation process of the dense medium cyclone. The controller controls the opening of the diverter valve according to an LSSVM model, and the opening of the water replenishing valve is controlled through a PID control method, and the precision and stability of the dense-medium suspension density are guaranteed; and a diverter main valve, a diverter bypass butterfly valve and an anti-blocking butterfly valve are designed for a diverter, and the stability and reliability of the system are guaranteed.

Description

technical field [0001] The invention mainly belongs to the field of dense medium cyclones in coal preparation plants, and in particular relates to an automatic control system for suspension density in the separation process of dense medium cyclones in coal preparation plants. Background technique [0002] As an important separation equipment in the gravity separation process of coal preparation plants, dense medium cyclones are widely used due to their simple structure, high separation precision, and large processing capacity. They are mainly used to process raw coal with a particle size of 50-0.5mm. The density of the dense medium suspension has an important influence on the separation effect in the separation process of the dense medium cyclone, and controlling the density of the suspension is an important key link to obtain a good separation effect. The main operating variables in the process of suspension density control are water supply and split flow, and split flow is...

AI Technical Summary

Problems solved by technology

This kind of density control method generally exists in old-fashioned coal washing plants. The control method is backward, the control accuracy and sensitivity are poor, the hysteresis is strong, and the medium consumption is high; 2. The water supply pipeline is installed in front of the media pump, and the PID control water supply valve Opening, without shunt circuit

The control accuracy and sensitivity of this method are significantly improved. However, since there is no split flow circuit and the slime content in the dense medium suspension is not considered, the stability of the dense medium suspension is poor, thereby reducing the separation of the dense medium cyclone. 3. The water replenishment pipeline is installed in front of the combined pump, and the opening of the water replenishment valve is controlled by PID. and inhomogeneity, the content of slime and magnetic substances in the suspension is also constantly changing, and the fixed split flow is not conducive to the stability of the dense medium suspension, thus affecting the separation effect of the dense medium cyclone; 4. Installation of water replenishment valve In front of the joint pump, PID is used to control the opening of the replenishment valve, and the fuzzy control method is used to divide the flow

The control method has high accuracy and sensitivity, and the system design takes into account the density and stability of the dense medium suspension. However, most fuzzy control designs only consider the liquid level or slime content of the medium tank, and there are many factors affecting the diversion process. , and the design of the fuzzy control system is relatively complex, which reduces the stability and adaptability of the system

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