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法国索拉克公司敦刻尔克厂4号高炉,炉容为3650m~3,炉缸直径14m,有风口40个,铁口4个,于1987年11月投产。该高炉1990年7月综合燃料比445kg/t铁,其中冶金焦(>25mm)270kg/t铁,碎焦25kg/t铁;煤粉180kg/t铁(煤焦置换比0.83),创下了高炉喷吹煤粉量的世界纪录。取得这一成绩的主要条件是:①炉况稳定顺行。在1990年5～7月间,日产量介于8500～9000t,利用系数2.4t/(m~3·d)。尽管喷煤量增加,高炉透气性指数(按炉腹煤气量计算)依然保持在4000左右,透气性良好,炉料呈有规律下降;热量损失也比较稳定,并且与按照恒定边缘气流计算的目标相一致(这是按炉墙上仍残留有耐火内衬考虑的)。采取对炉缸渣铁排放和煤气分布的控制亦有利于高炉操作的稳定;②鼓风条件
France Sorak company Dunkirk Plant No. 4 blast furnace, furnace capacity of 3650m ~ 3, 14m diameter furnace hearth, a tuyere 40, four iron mouth, put into operation in November 1987. The blast furnace in July 1990 consolidated fuel ratio of 445kg / t iron, which metallurgical coke (> 25mm) 270kg / t iron, broken 25kg / t iron; coal 180kg / t iron (coal coke replacement ratio of 0.83), setting a blast furnace World record of the amount of pulverized coal injection. The main conditions for achieving this result are: ① Stable furnace conditions go smoothly. From May to July 1990, the daily output ranged from 8500 to 9000t and the utilization coefficient was 2.4t / (m ~ 3 · d). In spite of the increase of the amount of coal injected, the blast index (based on the amount of gas in the flare) remained at about 4000, the gas permeability was good, and the charge showed a regular decrease. The heat loss was also relatively stable, and compared with the target phase Consistent (this is by the fire wall lining still considered refractory lining). Take control of slag discharge and gas distribution in the hearth is also conducive to the stability of blast furnace operation; ② blast conditions