为在福山2号高炉最大限度地降低成本,在高喷煤操作中进行了低风温操作试验。因低风温会使喷吹煤粉的燃烧性变差,为此,采取的措施是加强粉碎煤粉的粒度管理,同时充分利用现有设备提高富氧率。把风量比的下限定为1.40(风量比={(送风量+氧量[Nm~3/min])/炉内容积})。富氧率从基础5.2%增加到7.2%。在原燃料性能稳定的情况下进行了试验。从2001年9月起增加富氧率,15日以后,富氧率固定在7.2%。从 In order to minimize the cost at the Fukuyama No.2 blast furnace, a low-temperature operation test was carried out during the high-coal injection operation. Because of low air temperature will make pulverized coal combustion worse, for which reason, measures taken to strengthen the pulverized coal particle size management, while making full use of existing equipment to improve the oxygen enrichment rate. The lower limit of the air volume ratio is set to 1.40 (air volume ratio = {(air supply volume + oxygen amount [Nm ~ 3 / min]) / furnace volume}). The rate of oxygen enrichment increased from 5.2% to 7.2%. Experiments were conducted with stable raw fuel performance. From September 2001 increased oxygen enrichment rate, after 15 days, the oxygen enrichment rate fixed at 7.2%. From