HEARTH STRUCTURE OF ROTARY HEARTH FURNACE

Title:

HEARTH STRUCTURE OF ROTARY HEARTH FURNACE

Document Type and Number:

WIPO Patent Application WO/2007/113928

Kind Code:

A1

Abstract:

A hearth structure of rotary hearth furnace (1) capable of realizing safe and smooth operation is provided through as usual forming of a gap between refractories (13) and filling of various refractories or refractory raw materials in the gap, further finding of a novel structure designing technique ensuring a thermal expansion absorbing function by another method, and still further preventing of any contact between hearth structure and furnace side wall (3,4) attributed to thermal expansion of the refractories (13). The hearth structure of rotary hearth furnace (1) is one having two or more layers of refractories laid between side blocks (9,10) built on an inner circumferential end and outer circumferential end of hearth refractory constructed floor (7) of the rotary hearth furnace (1) and having powdery or block hearth material (16) laid on the upper surface of the refractories, characterized in that for at least refractory (14) laid on the uppermost layer, use is made of a refractory material having a compressive strength of 0.1 to 5 MPa at 800 to 1500°C.

Inventors:

SHIMA SHINJI (JP)
NAKAYAMA TOSHITAKA (JP)
SHIBATA TOMOAKI (JP)

Application Number:

PCT/JP2006/318792

Publication Date:

October 11, 2007

Filing Date:

September 15, 2006

Export Citation:

Click for automatic bibliography generation Help

Assignee:

NIPPON STEEL CORP (JP)
NIPPON STEEL ENG CO LTD (JP)
SHIMA SHINJI (JP)
NAKAYAMA TOSHITAKA (JP)
SHIBATA TOMOAKI (JP)

International Classes:

F27B9/16; F27B9/34

Foreign References:

JP2001254114A	2001-09-18
JP2001324274A	2001-11-22
JP2003185348A	2003-07-03
JP2002310564A	2002-10-23

Other References: