Optimizing coal flotation control based on an on-stream analyzer

摘要

The recent research advance about the coal slurry ash content online measurement makes itpossible to automatically and effectively control the coal flotation. The basic method and principle toonline analyze the coal slurry ash content is firstly introduced, and then the structure of the on-streamash content analyzer is designed. The multi-stream measurement system based on the on-streamanalyzer is presented. The process control of coal flotation has been designed by taking advantage ofthe multi-stream measurement system, the densimeter, the flowmeter and other sensors to measurethe process parameters. The optimum control algorithm combines the feed forward control with thefeed-back control. The feed forward system calculates the tonnage of coal in the feed entering theflotation system, and controls the reagent additions to the flotation feed according to the reagentconsumption per ton of coal. And the feed-back system amends the reagent additions further with thefuzzy logic control strategy. The mutual control mode can increase the clean coal recovery and keepthe minimum reagent consumption ensuring the ash content of the concentrate within the requiredspecification.