微粉炭多量吹込み時の高炉下部における液および微粉の流動特性

概要

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Cold model experiments on the fine particles movement, fine particles accumulation and liquid flow in the lower part of blast furnace at the high rate injection of pulverized coal were carried out. From the experimental results of the cold model on the liquid flow, it was found that the accumulation of fine particles on the surface of deadman caused liquid flow channeling along the surface of deadman. Two-dimensional cold model on the two phase flow of gas and solid indicated that shell layer formation at the depth of raceway was conducive to accumulation of fine particles on the surface of deadman. By the one-dirnensional cold model experiment of the moving bed on the two phase flow of gas and solid it became clear that fine particles hold-up in packed bed decreased as the increase in bed descending velocity as well as decrease in fine particles feed rate or increase in superficial gas velocity. On the basis o above results, control methods of lower part permeability at higher injection rate of pulverized coal were discussed. Consequently, it was estimated that decrease in coke degradation in raceway and removal of shell layer were effective to ensure the gas flow through deadman.
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