The charging doors of open-hearth (OH) and two-bath furnaces are usually lined with chromite-magnesite refractory brick and dried with an open flame. This results in uneven propagation of the temperature front throughout the volume of the lining, which in turn causes the brick to crack and leads to disintegration of the lining as a whole. The bricks fall onto the arch behind the skewback, which impedes heat removal and leads to bum-through of local sections of the arch and rapid destruction of the door lining. The liquid period of the heat is lengthened, refractory consumption increases, and furnace productivity drops. A unit has been proposed for lining and drying the charging doors of OH furnaces. The unit has the following main parts: a stationary guniting machine; a turntable; a repair station; pipes to deliver wet steam from an evaporative cooling system.
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