Steel production in EAF requires constant feed of carbon powder, lime or bio mass. Variations in powder quality, density, grain size or humidity cause changes in flow rate.
Velco GmbH /Germany developed and supplies since 50 years the dosing system EKS-K. It consists of a pressure vessel with an outlet with mechanical dosing system. A rotor is driven by an electric motor. The pockets of the rotor are filled with powder and discharged into the coneying line. This volumetric feed is constant with accuracy of 0,5%. Changes in feed rate are optained by changing motor speed and vessel pressure. Line clogging is prevented by analysing the pressure in the conveying line.
The Injection vessel can have up to 4 outlets having identical feed rate.