盖碳保护敞焰加热直接还原工艺的研究  

INVESTIGATION ON COALCOVERED OPENFIRINGDIRECT REDUCTION PROCESS

作　　者：王尚槐[1] 张健[1] 冯俊小[1] 赵平[1] 姚夏漪 

机构地区：[1]北京科技大学

出　　处：《钢铁》1998年第5期13-16,共4页Iron and Steel

摘　　要：对盖碳保护下敞焰加热含碳球团堆积料层的直接还原方法（ＣＯＦ法）进行了研究。试验结果表明，在完全燃烧的强氧化气氛中，仅用１０～１５ｍｍ的碳粒层就可有效地防止或明显减缓炉气对炉料的氧化，使海绵铁的金属化率在较宽的工艺参数范围内稳定地达到９０％以上，甚至超过９５％。盖碳保护后，料层一般可达４～７层球厚，使单位炉底面积生产率可达６０ｋｇ／（ｍ２·ｈ），并且在炉型结构、燃烧方法、炉膛气氛和操作参数的选择方面都有较大的灵活性。A COF direct reduction process,in which carbonbearing pellet bed covered by a coal layer is openflame heated, has been investigated.It was found that even in strong oxidizing atmosphere,the reoxidation of reduced iron can be avoided or decreased obviously by a covering coal layer with only 10～15 mm in thickness,so that the metallization of DRI may exceed 95 % in a wide range of operation parameters.With a protecting coal layer,the thickness of pellet bed can be increased up to of 7 pellets and the specific output of DRI per unit bottom area reaches 60 kg/(m2·h).In comparison with Fastmet and Inmetco processes,COF direct reduction process is more flexible in furnace construction,combustion method,furnace atmosphere,and operation parameters because of the protection of pellet bed surface by a coal layer.

关 键 词：直接还原 内配碳球团 敝焰加热 盖碳保护 炼铁 

分 类 号：TF55[冶金工程—钢铁冶金]