Bartlett-Snow Rotary Dryers
From Bartlett-Snow Thermal Processing
The Benchmark for Quality Thermal Process Equipment. Bartlett-Snow rotary dryers are offered in two basic designs, directly and indirectly heated. These designs are readily adaptable to a wide variety of processing applications and are offered as stand-alone units or as part of complete thermal processing systems.
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Bartlett-Snow Directly Heated Rotary Dryers
Bartlett-Snow Directly Heated Rotary Dryers
Rotary Dryer SystemThe direct heat dryer design consists principally of an inclined rotating cylinder with internal flighting. This type of design brings process material into direct contact with the drying medium, either in a cocurrent or countercurrent flow configuration. The drying medium may be products of combustion tempered with air, heated clean air or special gases. Direct heat rotary dryers are most appropriate when product characteristics reflecting particle size range, specific gravity, and shape permit reasonable drying air velocities through the cylinder, as well as for applications involving product temperatures upwards to 500ºC.
The wet material is fed into one end of the rotating cylinder where longitudinal parallel lifting fights pick up the material and cascade it in thin even sheets so that it will dry most advantageously. Usually as the material dries, its angle of repose changes. To accommodate this change, the lifting flight sections differ in size and shape, thus assuring optimum heat transfer at all points within the dryer.
Bartlett-Snow rotary dryers are provided with automatic temperature, pressure and electrical controls, with burner systems capable of firing natural gas, propane and/or oil.
Bartlett-Snow direct heat rotary dryers are available in sizes ranging from 6' to 156' in diameter and lengths from 3' to 100'.
Bartlett-Snow Indirectly Heated Rotary Dryers
Bartlett-Snow Indirectly Heated Rotary Dryers
The indirect heat rotary dryer design provides for heating under oxidizing, reducing, or inert atmospheric conditions. The rotary dryer design consists principally of a rotating cylinder that is enclosed in a furnace along its active length. With heat transfer indirect and through the cylinder wall, the gas velocities within an indirect dryer are low as compared to a direct heat dryer, and correspondingly, the off-gas system is smaller and more economical.
Applications that are appropriate for indirect heat rotary dryers involve a wide variety of fine powders, granular materials, pellets and extrudates that require product temperatures to 500ºC, bed temperature profiling and special atmospheres. Should the process require inert, reducing or special atmospheric considerations the dryer can be provided with gas-tight seals.
In order to get maximum utilization of radiation heat transfer, the interior of the dryer cylinder is fitted with agitating flights or special internals to gently handle and promote even heat transfer to the process material.
Bartlett-Snow indirect heat rotary dryers are provided with automatic temperature, pressure and electrical controls with furnaces featuring multiple gas, oil or dual fuel burners, or electrical heating elements arranged in zones.
Bartlett-Snow indirect heated rotary dryers are available in sizes ranging from 6' to 120' in diameter with lengths from 10' to over 100'.
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