Patent ID: 6698365
Filing Date: 2004-03-02
Classification: F23G,F23L

Abstract:
An apparatus for thermal treatment using superheated steam comprising:a first rotary kiln having a first nozzle pipe therein for spouting a first high temperature gas, a first charge portion of material to be treated on one side thereof and a first discharge portion of the material dehydrated with the first high temperature gas on other side thereof, the first high temperature gas comprising one or both of high temperature superheated steam and high temperature combustion exhaust gas; a second rotary kiln having a second nozzle pipe therein for spouting a second high temperature gas, a second charge portion of the material dehydrated by the first rotary kiln on one side thereof and a second discharge portion of the material carbonized with the second high temperature gas on other side thereof respectively, the second high temperature gas comprising mainly high temperature superheated steam with a temperature higher than a temperature of the first high temperature gas; and a mechanism for discharging treated material provided to the second discharge portion of the second rotary kiln for discharging the carbonized material outside after lowering a temperature of the material in an oxygen-free state so that spontaneous combustion of the carbonized material may not occur in an atmosphere, wherein the first rotary kiln is disposed above the second rotary kiln, the first discharge portion of the first rotary kiln has a chute for discharging the material form the first rotary kiln, a screw conveyor for feeding material which feeds the material discharged form the chute into the second rotary kiln is provided to the second charge portion of the secondary rotary kiln, and the first discharge portion and the second discharge portion are connected.