Fluidized furnace construction for burning partly dehydrated sludge

Abstract

A fluidized bed-furnace for burning partly dehydrated sludge comprises a furnace housing having a bottom forming a surface for a fluidized bed. Side walls extend upwardly from the bottom and above the fluidized bed in defining combustion chamber above the bed. An inlet for sludge on one side of the housing extends into the side walls and a discharge for the sludge on the opposite side of the housing extends outwardly from the side walls. The bottom is made of a plurality of steps arranged at distinct elevations in descending order from the inlet to the outlet or discharge. Each step portion includes a grate having a wind box associated therewith through which heating gases and including combustion air is directed upwardly through nozzle elements which extend in openings of the grate. The entire bottom with all of the step portions are advantageously supported on a support structure which is suspended at the bottom of the furnace and it is advantageously removable from the bottom.

Dependencies are inferred from the claim text.