Patent ID: 6860735

Claim:
A rotary kiln comprising a cylindrical furnace body 10 disposed to incline at a small angle from the horizontal plane, a cylindrical contact heater 20 supported in said furnace body 10 along the longitudinal direction thereof, a rotation drive means 30 that drives said furnace body 10 and said contact heater 20 to rotate around the center axis thereof, a waste charging port 61 for charging the waste into the furnace body at the proximate end thereof, a discharging port 18 for discharging processed material that has moved from the charging port 61 at the distal end of said furnace body 10 , a combustion gas supply means 40 that supplies a combustion gas into said cylindrical contact heater 20 at the distal end, a combustion gas guiding means 50 that guides the combustion gas supplied from said combustion gas supply means 40 through said contact heater 20 from the distal end to the proximate end and then guides the combustion gas that has been released from the proximate end into the furnace body 10 through a space S between said contact heater 20 and said furnace body 10 from the proximate end to the distal end, thereby to discharge the gas from the furnace body 10 at the distal end thereof to the outside.