The asphalt production process begins when the stockpiled aggregates in the cold feeders are metered and conveyed to a dryer drum where they are heated to a specific temperature. The control objectives are to obtain a dry product at an optimum temperature for the next process and fumes (combustion gases) at the possible lowest temperature, on one hand not to damage the bag filter and on the other to minimize energy consumption, thus increasing the efficiency of the drying process.

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