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■■■■■■■■■■■■■■■■■■■ 川崎製鉄技報 KAWASAKI STEEL GIHO Vol.21 (1989) No.3 ■■■■■■■■■■■■■■■■■■■ |
| 上底吹き転炉製鋼法の最近の進歩 Resent Progress of Top and Bottom Blown Converters at Kawasaki Steel Corporation 岸本 康夫(Yasuo Kishimoto) 加藤 嘉英(Yoshiei Kato) 桜谷 敏和(Toshikazu Sakuraya) 藤井 徹也(Tetsuya Fujii) 山田 純夫(Sumio Yamada) 大宮 茂(Shigeru Omiya) |
| 要旨 : 当社における上底吹き転炉の最近の進歩について述べた。LD-KGCにおける底吹き不活性ガス量の増加およびK-BOPにおける混合ガス法により，攪拌力の強化を進めた。さらに底吹きガスが冶金特性向上に果たす役割を明らかにするべく，CO分圧と攪拌力を変化させて実験を行った。その結果。底吹きガスの攪拌力の効果がCO分圧希釈効果より大きいことを明らかにした。転炉の冶金反応を定量的に理解するために，攪拌が[C]と[O]の推移に及ぼす影響を考慮に入れて新しい反応モデルを展開した。実験結果に基づき，LD-KGCにおいてCOを，K-BOPにおいてCO2の適用を行った。また上底吹き転炉によるクロム鉱石の溶融還元に関する研究についても述べた。 |
| Synopsis : Kawasaki Steel has developed two types of top and bottom blown converters, namely K-BOP and LD-KGC. K-BOP blows part of the oxygen gas together with lime through bottom tuyeres. As for LD-KGC, an inert gas is injected through bottom tuyeres and the oxygen gas is blown through the top lance. Stirring force was intensified by increasing the flow rate of the bottom-blown inert gas in LD-KGC and by mixing the inert gas with bottom-blown oxygen at the final stage of the refining in K-BOP. The role of the bottom-blown gas for the improvement in metallurgical reaction was studied by changing the partial pressure of CO and stirring force. These studies have revealed that preferential decarburization is more affected by stirring force rather than partial pressure of CO in the bottom blown gas. In order to quantitatively understand the metallurgical reaction in a converter, a new reaction model was theoretically developed by considering the stirring effect on changes in carbon and oxygen concentrations. On the basis of the above results, the carbon monooxide gas to LD-KGC, and carbon dioxide gas to K-BOP have been used in practice. Studies on smelting reduction of chromium ore in K-BOP are also briefly described. |
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