Wet coal slime is fed into the drying drum via a loading system. As the drum rotates slowly and steadily, specialized internal lifting flights and a cleaning chain assembly go to work. Upon entering the equipment, the material is continuously lifted and scattered by the flights, breaking up clumps, while the cleaning mechanism scrapes away material adhering to the drum walls to prevent clogging.
A hot-blast stove generates a high-temperature airflow that travels either co-currently or counter-currently through the drum. This air makes full contact with the dispersed coal slime, rapidly removing both free internal moisture and surface moisture. The continuous rotation of the drum advances the material, allowing for repeated heat exchange with the hot air and a gradual reduction in moisture content.
Once dried to the required standard, the coal slime is discharged from the end of the unit, while the moist, hot exhaust gas is purified by dust-removal equipment before being released in compliance with emission standards. The entire process operates in a continuous cycle, utilizing the dual action of mechanical breakup and hot-air heat exchange to dehydrate and dry the high-moisture, sticky coal slime.
