Heat treatment apparatus

A heat treatment apparatus comprising:

• a first screw conveyor;
• a second screw conveyor in parallel with the first screw conveyor;
• a first nozzle pipe which is disposed on a lateral side of the first screw conveyor and which ejects a high-temperature gas composed of superheated steam or a high-temperature combustion gas;
• and
• a second nozzle pipe which is disposed on a lateral side of the second screw conveyor and which ejects a high-temperature gas composed of superheated steam or a high-temperature combustion gas,
• wherein, in the case where a discharge side of a kiln is viewed from an input side of the kiln for a raw material to be treated, the first nozzle pipe is disposed on a left lateral side of the first screw conveyor in the case where the first screw conveyor rotates right, and the first nozzle pipe is disposed on a right lateral side of the first screw conveyor in the case where the first screw conveyor rotates left, and
• in the case where the discharge side of the kiln is viewed from the input side of the kiln for the raw material to be treated, the second nozzle pipe is disposed on the left lateral side of the second screw conveyor in the case where the second screw conveyor rotates right, and the second nozzle pipe is disposed on the right lateral side of the second screw conveyor in the case where the second screw conveyor rotates left,
• wherein, in the case where the discharge side of the kiln is viewed from the input side of the kiln for the raw material to be treated,
• the first screw conveyor rotates right,
• the second screw conveyor rotates left,
• the second screw conveyor is disposed on a right side of the first screw conveyor,
• the first nozzle pipe is disposed on the left lateral side of the first screw conveyor, and
• the second nozzle pipe is disposed on the right lateral side of the second screw conveyor, and
• wherein in the case where the discharge side of the kiln is viewed from the input side of the kiln for the raw material to be treated,
• the first nozzle pipe is disposed on an upper left side of the first screw conveyor,
• the second nozzle pipe is disposed on an upper right side of the second screw conveyor,
• the first nozzle pipe and the second nozzle pipe have a plurality of ejection sections, which are nozzles or holes for ejecting the high-temperature gas, and
• the plurality of ejection sections eject a high-temperature gas downward or laterally downward.