Rotary hearth furnace that prevents the refractory material for falling under the effects of thermal expansion

摘要

A rotary hearth furnace of a general-purpose type, which has a simple hearth structure which does not cause any damage to the hearth due to expansion of refectory material even after long-term operation is disclosed. A radial thermal expansion tolerance X defined by a formula (2) is set between an outer peripheral or inner peripheral corner refractory material and the refractory material or between the refractory materials when the requirement represented by formula (1) is satisfied: X + A < "(A2 + B2) ··(1) wherein A represents the width of an outer peripheral corner refractory material (7); and B represents the height of a support metal material (11) of the corner refractory material (7). X = ([X0=] distance between the outer end part of the outer peripheral support metal material (11) and the inner end part of the inner peripheral support metal material (12) at the operation temperature) - ([X1=] sum of the length at room temperature in a radial direction of a plurality of refractory materials (6) and corner refractory materials (7,8)) ··(2)