Online monitoring system of alumina concentration in aluminum electrolytic cell

摘要

An online monitoring system of alumina concentration in aluminium electrolysis has been designed directing at the difficult concentration measurement of alumina. Firstly, a current-measuring instrument with anodic guide rod is developed to collect data about the temperature of anodic guide rod and isometric pressure drop. Then a set of upper-computer software based on COM technology is produced, which consists of OPC server and OPC client software. Eventually, preliminary analysis on the collected data is conducted, least-square support vector machine algorithm optimized by particle swarm is applied to take the training and prediction regarding alumina concentration. Thus achieving the online real-time display of alumina concentration, with mean absolute measuring error reaching 2.631%, which is instructive and meaningful to electrolytic aluminium production process.