高Ca炭使用による高強度・高反応性コークス製造および高炉内反応効率向上技術(コークス製造技術への展開,<特集>劣質な石炭のコークス化機構解析とコークス強度評価)

概要

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A method to produce coke in 'lump' form with high strength and reactivity through the addition of a catalyst was investigated in order to improve blast furnace reaction efficiency. The addition of Ca compounds to coal before carbonization was found to considerably increase the reactivity of the coke at a low temperature range equivalent to the thermal reserve zone temperature of a blast furnace. Furthermore it was proved that strong, highly reactive 'lump' form coke could be produced by adding a Ca-rich non-caking coal and adjusting the coal blend composition. Based on this fundamental study, the Ca-rich coke was successfully produced in coke ovens on a commercial scale, both at Kimitsu and Muroran works. The use of the Ca-rich coke in the Muroran No.2 blast furnace was found to cause a decrease in the reducing agent rate by lO kg/t-p. This technology, producing coke of high reactivity and strength through catalyst addition, is promising as a means of improving the reaction efficiency of a blast furnace.
社団法人日本鉄鋼協会の論文
2006-03-01