Patent ID: 7922484
Filing Date: 2011-04-12
Classification: F27B,F27D

Abstract:
1. A rotary hearth furnace in which a rotary hearth being arranged between an outer circumference wall and an inner circumference wall includes an annular hearth frame, a hearth heat insulating material arranged on the hearth frame, a plurality of refractories arranged on the hearth heat insulating material, an outer circumference side corner refractory arranged to an outer circumference part of the rotary hearth through a first hearth curb casting, and an inner circumference side corner refractory arranged to an inner circumference part of the rotary hearth through a second hearth curb casting; wherein between the corner refractory of the outer circumference side or the inner circumference side and an outermost or innermost refractory, respectively, or between each of the plurality of refractories, a radius direction thermal expansion margin X defined by the following equation 2 is set, and if a width of the outer circumference side corner refractory is given as A and a height of the first hearth curb casting of the outer circumference side corner refractory is given as B, the following equation 1 is satisfied: