What is the working principle of the drum dryer?

What is the working principle of the dryer? What is the scope of the drum dryer? What are the precautions for the drum dryer? What is the classification of the drum dryer? Next for everyone to explain:

The drum dryer is an indirect heating continuous drying machine. The material forms a uniform film on the heat transfer surface, which is dried with the drum rotating process, and is removed by the scraper at the discharge point to obtain a powder or sheet product. The specially designed cloth device makes the film uniform and thick, and is suitable for slurry and porridge-like viscous materials. The material stays at a high temperature for a short period of time and does not overheat. Compared with the direct drying of hot air, the drum dryer does not require a powder separation device, and the exhaust gas does not carry a large amount of heat, and the operation cost is low.

How the drum dryer works

The drum is a slightly inclined and rotatable cylinder. The wet material enters from the upper end and the dry material is collected from the lower end. Hot air enters from the feed or discharge end and exits from the other end. The cylinder is equipped with a forward copying board, so that the material is continuously picked up and sprinkled during the rotation of the cylinder to make it fully contact with the hot air flow to improve the drying efficiency and move the material forward. The heat source of the dry material is generally hot air, high temperature flue gas, water vapor and the like.

Drum dryer range:

Chemical, miners, metallurgical and other industries, such as ore, slag, coal, metal powder, clay, diatomaceous earth, kaolin. 2. Agriculture, feed, fertilizer industry, such as straw, pasture, leaves, fish meal, corn sauce, starch residue, distiller's grains, dregs, pomace, soy sauce residue, bagasse, peat, organic compound fertilizer, sludge, aquatic product waste , food factory waste, slaughterhouse waste, organic fertilizer, inorganic fertilizer, phosphorus fertilizer ammonium sulfate.