Toto Ltd.

Takeshi Ogawa

Norio Tanaka

Tatsuhiro Kosugi

This disclosure is directed to a method for controlling the preheating zone of a tunnel kiln which includes firing and cooling zones. The method comprises forcedly blowing air from the entire ceiling portion of the preheating zone in the downward direction to diffuse hot combustion gas present in the upper portion and to reducing a difference in temperature between the upper and lower portions of the preheating zone. Air may be blown into the preheating zone at a flow rate determined from the quantity of the combustion gas within the preheating zone.

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Kitakyushu, Japan

Takeshi Ogawa