TUNNEL KILN FOR FIRING POROUS CERAMIC MATERIAL

摘要

Provided is a tunnel kiln for firing porous ceramic material that can fire porous ceramic material containing an organic binder without causing cracking, without the need for nitrogen gas, and in a shorter amount of time than conventional firing. The tunnel kiln for firing porous ceramic material is provided with a preheating zone (1), a firing zone (2), and a cooling zone (3), and the porous ceramic material is loaded onto a wheeled platform (7) and fired as it travels inside a furnace. A thermal storage regenerating type burner (10) is used as a heating means for the firing zone (2), and the low oxygen concentration exhaust gas exhausted from the thermal storage regenerating type burner (10) is returned via an exhaust gas return line (14) and forced into the preheating zone (1). A combustion device (17) that consumes the oxygen in the exhaust gas so as to reduce the oxygen concentration therein may be provided on the exhaust gas return line (14).