What is a Cyclone Furnace ?

Cyclone furnaces are used in boilers to burn poor quality coal which are not suitable for normal pulverized coal combustion.  These coal particles require higher temperatures and more oxygen to burn. 

Cyclone furnaces, as the name suggests, are able to provide a cyclone of air which results in greater turbulence which results in better mixing of the coal and air.  The cyclone of air also causes greater exposure of the surface area to the flame. 

The particles are whirled about in the air flow which results in greater exposure of the surface of the coal particle to the atmosphere.