Drying

The TorusDisc consists of a stationary horizontal vessel, equipped with a heating/cooling jacket, housing a tubular rotor with vertically mounted double-walled discs. As heating media (cooling media), hot water, steam, or thermal oil (industrial water, cooling water, or cooling media for cooling) acan be introduced to the jacket and rotor. The construction of the disc rotor for steam media is different from that of thermal oil. In case of steam media, the condensate is picked up by dipper pipes during the rotation of the discs and discharged continuously. In case of thermal oil heating, it enters one end of the rotor shaft, passes through each disc and goes out from the other end of the shaft. In either construction (steam/oil), the dryer is constructed in such a way each disc is evenly heated with uniform temperature distribution.

Feed material is charged at one end of the dryer, and then it is transported through the annular space between the discs and the vessel toward the discharge port. Conveying vanes are fixed to the outer rim of the discs to control conveyance. Stationary agitator plows are located between the discs to the better mix the powder, to convey the material to the next annular space, and to prevent material build-up on heat transfer surfaces. Thus, the material securely travels between the discs receiving heat, and short-circuiting above the discs is prevented. The functions of the vanes and the plows increase the heat transfer efficiency by agitating/mixing. The dried product is discharged by overflow from the weir placed at the end of the vessel. Adjusting the height of the outlet weir controls the residence time. By applying inert gas, such as N2, as a carrier gas, it is possible to dry volatile solvents, to prevent oxidation of the material or moisture absorption by the product.