高炉への水素系還元材吹き込み(<特集>鉄鋼業における省エネ・炭酸ガス削減技術の取り組み)

概要

論文の詳細を見る
Global warming is a common subject in steel industry. To reduce the carbon dioxide emission at ironmaking process, mitigation of reducing agents(coke and injected coal are main material in Japan) is necessary. Furthermore , shift of reducing agents from carbon-rich material such as coke to hydrogen-rich material is effective means. Generally, hydrogen is added to a blast furnace by injection of hydrogen-rich gas such as Natural gas from tuyer. The replacement ratio of natural gas to coke is around 1.2 by weight bases and is higher than that of injected coal(around 0.9). While hydrogen-rich gas injection can reduce coke rate and reducing agent rate, following phenomena must be paid attention with large amount of the injection. Flame temperature falls with constant blast conditions by decomposition heat of hydrogen-rich gas. While hydrogen addition improves reduction behavior of burden materials, temperature of upper part of furnace falls by endothermic effect of hydrogen gas reduction. To control of inside temperature of a blast furnace in a suitable range, operational conditions such as oxygen enrichment of blast must be designed adequately.
一般社団法人日本エネルギー学会の論文
2010-01-20