| 摘要 |
PROBLEM TO BE SOLVED: To provide a pipe structure for preventing falling-off by the deterioration in a refractory, a port winding structure and a furnace. SOLUTION: This pipe structure is constructed horizontally or obliquely to the horizontal, and is composed of the refractory. The pipe structure is provided for constituting a cross section vertical to the shaft direction out of a combination of a straight line and/or a curve, and preventing falling-off of the refractory larger in curvature of the uppermost part in the cross section than curvature at a point in the right-angled direction to the uppermost part. Or the pipe structure is provided for constituting the cross section out of a curve having continuously changing curvature, and preventing falling-off of the refractory larger in the curvature of the uppermost part in the cross section than the curvature at the point in the right-angled direction to the uppermost part. COPYRIGHT: (C)2004,JPO
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