高炉内における装入物の降下と溶融の挙動に及ぼす炉体内壁面形状の影響

概要

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The influence of the inner wall profile on the descending and melting behaviors of burden were analyzed by using a three-dimensional semicircular warm model of the blast furnace under conditions set as similar as possible to the physical phenomena in the furnace. In the case of a profile with blocks installed on the belly where the horizontal stress acting to the wall is at its maximum, a sluggishly descending zone of a thickness 2〜5 times of the projecting length of the blocks is formed near the wall just above the blocks. The thickness of the sluggishly descending zone near the wall increases with increasing projecting length of the blocks on the wall and with decreasing installation interval of distance between the blocks and it decreases with increasing ore/coke near the wall. The height of the dead man decreases with the formation of the wall sluggishly descending zone due to the blocks on the wall and dead man temperature decreases. For decreasing the thickness of the sluggishly descending zone near the wall, the ore/coke near the wall should be preferably increased as far as the heat-flow ratio is permitted. Such a burden distribution is effective for high-rate pulverized coal injection operation in which the melting capacity near the wall is large.
社団法人日本鉄鋼協会の論文
1991-12-01