Harper International has announced initial data on its 3 meter wide production scale oxidation oven for carbon fiber manufacturing, demonstrating outstanding performance for key metrics including air velocity uniformity and temperature uniformity. Data was acquired at temperatures up to 280 °C and air velocities up to 4 meters per second.
Microwave heating provides benefits over conventional heating because the material to be processed is the heating element, generating its own heat. Since most ceramic materials have low conductivity and in conventional processing the heat transfer occurs by conduction or inter-particle radiation, the processes are slow.
The use of tube internals in a rotary furnace can increase heat transfer surface area, improve radial mixing, improve gas-solid interactions, control gas flow direction, and even control material dwell time or velocity through the tube. All of these can result in a reduction of residence time required or increase unit capacity for a given volume of furnace but can also improve product quality and control of quality and uniformity.