Design of automatic shunt control system in dense-medium separation process
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摘要: 针对重介分选过程分流阀手动控制存在精确性差、介质消耗量大等问题，设计了一套重介分选过程分流自动控制系统，建立了基于最小二乘支持向量机的分流阀开度预测模型。该系统利用传感器采集悬浮液密度、煤泥含量、合介桶液位和补水阀开度等参数，作为分流阀开度预测模型的输入变量，经模型计算得出相应的分流阀开度输出值并输送至PLC，PLC根据分流阀开度值控制分流阀动作, 从而实现分流量自动控制。实际应用表明，该系统可使重介悬浮液密度波动控制在±0.005 g/cm3，吨煤介耗降低了0.216 kg。Abstract: In view of problems of poor accuracy and high medium consumption of manual control of shunt in dense-medium separation process , an automatic shunt control system in dense-medium separation process was designed, and opening prediction model of the shunt valve based on the least squares support vector machines was established. The parameters including suspension density, coal slime content, qualified medium tank level and opening degree of water supply valve are collected by sensors, which are used as input variables of opening prediction model of the shunt valve. Output value of opening degree of the shunt valve is calculated by the model and then is sent to PLC, so as to control operation of the shunt valve and realize automatic shunt control. The application results show that the density fluctuation of suspension liquid can be controlled in the range of ±0.005 g/cm3, and the ton coal dense-medium consumption is reduced by 0.216 kg.
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