GEA Barr-Rosin offers a diverse range of direct and indirect rotary dryers, all custom engineered to suit specific requirements.
The directly heated rotary dryer operates on the principle of lifting and showering the product through a hot gas stream moving either in parallel or counter-flow.
In the indirect dryer, which is more suited to fine and dusty materials, there is little or no contact between the product and the drying gases since they are heated from the outside, via a stationary jacket fitted with either multiple burners or other external heat source.
Noted for their flexibility and heavy construction, rotary dryers are less sensitive to wide fluctuations in throughput and product size.
For greater thermal efficiency and where inertisation is required, recycling of exhaust gases can be used. This can be implemented on all our airstream drying systems and retrofitted on customer's existing drying operations.
Sizes start from small units under 2 ft (0.6 m) but may exceed 14 ft (4.2 m) in diameter and 100 ft (30 m) length, with evaporative capacities up to 30-40 tonnes per hour.
Rotary dryers are suitable for a wide variety of products, ranging from granular, powdered and crystalline materials, through to filter cakes and sludges for the food, chemical and mineral industries.
Rotary dryer for phosphate rock
Rotary coolers are either of the counter-flow cascade type, for coarse and granular materials or are indirectly water cooled for fine and dusty products.
Rotary calciners may be of the direct-fired refractory lined or unlined type, or indirectly heated in the same way as the dryers.