Fluidized bed combustion systems use a heated bed of sand-like material suspended (fluidized) within a rising column of air to burn many types and classes of fuel.  This technique results in a vast improvement in combustion efficiency of high moisture content fuels, and is adaptable to a variety of waste type fuels.  The scrubbing action of the bed material on the fuel particle enhances the combustion process by stripping away the carbon dioxide and char layers that normally form around the fuel particle.  This allows oxygen to reach the combustible material much more readily and increases the rate and efficiency of the combustion process