The core working principle of a vertical disc dryer is indirect conduction heat transfer.
Structural core: There is a vertically installed hollow spindle inside the machine, with multiple hollow disks (or discs) connected in series on the spindle. These disks constitute the main heat transfer area.
Heating medium: Heat medium (such as steam, thermal oil, hot water) enters from one end of the main shaft, flows through the main shaft and all hollow disks, then transfers heat to the material flowing between the disks, and finally discharges from the other end of the main shaft.
Material process: Wet materials are continuously added from the feeding port at the top of the dryer and fall onto the top disc.
Mixing and conveying: With the rotation of the main shaft, the rake arm/blade installed on the disc or main shaft rotates accordingly. These blades have two functions:
Mixing: Continuously flip the material to evenly heat it, avoiding local overheating or crust formation.
Conveyor: Through special design, the material is gradually scraped off from the upper disc and pushed to the lower disc.
Drying process: As the material moves layer by layer from top to bottom, it comes into full contact with all high-temperature disk surfaces, and the moisture is rapidly evaporated. The water vapor generated by evaporation is carried away by the induced draft system at the top of the equipment.
Finished product discharge: The dried material finally reaches the bottom and is continuously and uniformly discharged through a discharge device (such as a star shaped discharge valve).