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为提高高炉炉内反应效率,新日铁研究了使用涂敷催化剂生产高强度、高反应性块焦的技术及其在高炉的使用技术。首先,通过在线试验证明焦炭涂敷 Ca后,提高了反应性,同时有助于降低高炉热平衡带温度。在此基础上,研究了添加含高 Ca 煤生产高反应性焦炭的方法,在实际焦炉上确认了它能生产出强度与以往一样的高反应性焦炭。尤其是,在北海制铁所室兰厂2号高炉上通过长时间连续使用添加高 Ca 煤生产的高反应性焦炭,证明了高炉全部使用高 Ca 高反应性焦炭后,降低了还原剂比。由此可以认为,使用涂敷催化剂的高反应性焦炭,是实现提高高炉炉内反应效率最有效的方法。
In order to improve the efficiency of blast furnace reaction, Nippon Steel has studied the use of coated catalyst to produce high strength, high reactivity block coke technology and its use in the blast furnace technology. First, it was demonstrated through online tests that coke coated Ca improved reactivity and helped reduce the blast furnace heat balance band temperature. On this basis, the method of adding high Ca coal to produce highly reactive coke was studied, and it was confirmed on actual coke oven that it can produce high reactivity coke with the same intensity as usual. In particular, the use of high-reactivity coke produced by continuous addition of high-Ca coal for a long time on the No. 2 blast furnace of the North Sea Institute’s Muroran Plant proved that the reducing agent ratio was lowered after all the high-Ca-reactive coke was used in the blast furnace. From this, it is considered that using a catalyst-coated high-reactivity coke is the most effective way to improve the reaction efficiency in a blast furnace.