Patent ID: 9170052
Filing Date: 2015-10-27
Classification: C21C,F27D

Abstract:
1. A lower vessel of an RH degasser where a bottom portion having two circulating flow tubes is lined with a plurality of bottom part refractories, and an inner surface of a side wall is lined with a plurality of side-wall refectories, wherein: the plurality of bottom part refractories include center part refractories which are arranged at a center part sandwiched between two circulating flow tubes, arrangement refractories which are contiguously arranged with the center part refractories, and are arranged along an intersecting direction which intersects a line which passes the center part and connects two circulating flow tubes in a horizontal cross-sectional view of the bottom part, connection refractories which are arranged at positions where at least a portion of each of the connection refractories overlaps with a vertically downward projection view of the side-wall refractories, and other bottom part refractories which are arranged at other bottom portion positions, of the connection refractories, at least the connection refractories which are arranged contiguously with the arrangement refractories are formed of two or more force transmission refractories per row, which are arranged toward the arrangement refractories from the side-wall refractories, and the force transmission refractories are configured such that, to convert a load in the vertical direction from the side wall refractories into a force in the lateral direction, opposedly facing surfaces of the force transmission refractories at least at a position between the neighboring force transmission refractories in a row are inclined such that upper portions of the opposedly facing surfaces are positioned more inside of the bottom portion than lower portions of the opposedly facing surfaces are positioned.