| 摘要 |
PROBLEM TO BE SOLVED: To provide a hearth furnace structure capable of effectively preventing disturbance in rotation of a hearth furnace caused by contact of a side edge portion of a rotary hearth furnace with a side wall of the furnace with a simple structure in the rotary hearth furnace having a rock hearth furnace as an uppermost layer of the rotary hearth furnace. SOLUTION: In this rotary hearth furnace, a clearance portion 22 is formed at least between the rock hearth furnace 12 and a monolithic refractory layer 15 of the rotary hearth furnace 3, a length in the width direction of the clearance portion 22 is determined to be more than a length obtained by adding expansion quantity in accompany with composition change to thermal expansion quantity of a metal or iron oxide material layer in temperature rise, and less than a length obtained by adding a diameter of an agglomerated material charged into the rotary hearth furnace 3 to the length, and an expandable and contractible refractory substance is charged into the clearance portion 22. COPYRIGHT: (C)2008,JPO&INPIT
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