Coal drying technology is divided into drum drying and drum distillation units ---- two kinds of technology.Drum drying means adopting rotary drum dryer for drying to reduce the water moisture, its products are high heat value quality coal; Drum drying distillation technology refers to using rotary drum dryer and rotary distillation machine together, the dryer dehydration and heat of coal , dry distillation machine dry distillation of lignite removal volatile part and the internal moisture,the product is high heat value, low sulfur, low water moisture, low volatile of dry distillation upgrade coal .

    Coal, blue carbon drum dryer mainly by the heat source, belt feeding machine, rotary drum, belt discharging machine, induced draft fan, cyclone dust collector, bag filter, nitrogen or carbon dioxide gas oxygen concentration prosecution explosion-proof security system, power distribution and temperature, pressure, oxygen concentration, speed of interlocking spreading system.The equipment adopts the countercurrent (or downstream) drying technology, its working principle is as follows: wet material after entering drying drum points divided into the following workaround: one is the feeding area, the coal into the area with high temperature hot air quickly evaporate moisture, the material in large Angle of guide plate copy, to be imported into the next  workspace;2 it is to copy the plate area, the coal in this area is lifting by copy board and forming curtain material status, the coal temperature gradually increased to more than 150-250 ℃ (different types of coal with different temperature),at this time the material has good contact with hot air, the moisture in coal rapid evaporation and become water vapor, water vapor was siphoned off by induced draft fan,