Content area
Full Text
Rotary calciners can provide efficient high-temperature processing and high heat transfer rates for bulk solids materials.
Used to heat materials that are fine and dusty, sensitive to oxidation, combustible, explosive, potentially contaminating or thermally sensitive, rotary calciners isolate the materials to be processed in a high-temperature chamber. The calciner's indirect-heat-source design ensures complete separation between the heat source and the product during processing. In applications from catalyst manufacturing, hydrocarbon processing and wood biomass torrefaction to chemical-making and precious metal recovery, as companies look for materials that have finer particle sizes and uniform quality, rotary calciners deliver the performance needed.
A rotary calciner consists of an alloy steel cylinder that rotates inside an electrically or gas-heated furnace. A material feeder continuously introduces the product inside the cylinder, which is turned by an external drive mechanism. As the cylinder rotates, the material moves into the heated furnace, within which the atmosphere inside is kept at a constantly controlled, predetermined condition. To close offthe ends of the cylinder, stationary housings are used. The upstream housing allows manufacturers to hook up product-feeding equipment, and the downstream housing provides a connection for off-gas cleaning equipment to collect and process vapor emitted from the product. After exiting the...