| 摘要 |
PURPOSE:To uniformize the temp. distribution in a furnace at the time of not only calcination but cooling as well so that the calcined article which is free from unequal calcination and cooling is obtd. by changing the ejection position and discharge position of a combustion gas at the time of the calcination and the cooling and periodically changing the ejection speed thereof. CONSTITUTION:The article to be calcined is imposed on a carriage 2 and is fed into the calcination zone in a furnace body 1 of the tunnel furnace. The high-temp. combustion gas is ejected from plural burners 5, 6 provided to face each other on both sides in the lower part of said furnace body while the ejection speed is periodically change in such a manner that the collision positions of the gas in the furnace move in the transverse direction of the furnace to form the good circulating flow in the same direction as buoyancy. The gas is discharged from a discharge hole 3 with a damper 4 on the ceiling. The combustion gas is then ejected similarly from the plural burners provided in the opposite positions on both sides in the upper part of the cooling zone to form the good downward circulating flow. This gas is discharged from discharge pipes 9, 10 on both sides in the lower part. The calcined article which is free from the unequal cooling is thus obtd. |
