レースウェイ空間に吹き込まれた粉鉱石の飛翔還元機構と高速還元方法

概要

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The knowledge on the microscopic reduction behavior of fine iron ore in hot reducing gas flow is indispensable to accurate description of the extremely complex raceway combustion zone induced by PCI (Pulverized Coal Injection) and OI (fine iron Ore Injection) from blast furnace tuyeres. In the studies using the vertical flow reactor and the tube type reactor where fine materials were transported by the pressure difference in the gas chambers, and thereby a short residence time and a rapid heating rate of fine materials in the raceway combustion zone were simulated, the reduction degree of fine iron ore as well as the reduction morphology were investigated in detail under the conditions of the combined injection (PCI+OI) and the carbon coated ore injection. The experimental results revealed that the in-flight reduction degree of fine iron ore was significantly increased mainly by the improved efficiency of contact of fine ore particles with reducing agents. And the carbon coating of the fine ore surface achieved the most excellent condition for promoting the in-flight smelting reduction.
社団法人日本鉄鋼協会の論文
1993-10-01