Structural Flakeboards and Composites 



2933 



After-burning is an effective method but will nearly double the fuel cost unless 

 the gases can be introduced into an existing boiler. 



Heating alternatives. — Fuel costs for drying are high and increasing. The 

 gas-fired, oil-fired, or combination burners commonly used in dryer furnaces 



EXHAUST (CLEAN GAS) 



SECONDARY 

 GAS INLET 



STATIONARY 

 VANES 



SECONDARY 

 AIR 



PRIMARY GAS 

 DUST INLET 



STATIONARY 

 SPINNER 



SEPARATED DUST 

 IS DEPOSITED IN 

 / HOPPER 



CLEAN GAS 



SECONDARY GAS 



DUST 



Figure 24-15. — Dust collector for use behind the primary collector at outfeed end of 

 rotary-drum flake dryer. The dirty gas stream (A) enters collector chamber (B), past a 

 stationary turning vane (C), which imparts a rotary motion to the flow (D). Centrifugal 

 force directs the dust toward the outer wall of the collector where it is engaged by a 

 secondary gas stream (E) and directed spirally downward (F). Clean gas exhausts at 

 the top. (Drawing after Aerodyne Development Corporation.) 



