Powder feeder

A waste combustion system comprising a converter for combusting a waste to generate a converter gas;

• a fluidized bed combustor for combusting the converter gas to recover heat;
• and a powder feeder, said powder feeder comprising:
• a cylinder body connected to a gas blow pipe for fluidizing a powder at its bottom portion;
• a porous plate crossing the lower portion of said cylinder body above a gas blow hole;
• partitioning means for vertically dividing the interior of said cylinder body into a powder supply side and a delivery side and for communicating the supply and delivery sides with each other at its upper portion;
• a powder supply pipe connected to the lower portion of said cylinder body at the supply side to be inclined downward toward a connecting portion;
• and a powder delivery pipe connected to the lower portion of said cylinder body at the delivery side to be inclined downward in a delivery direction.