炉料金属化率对高炉工艺和操作参数的影响  

Influence of preliminary metallization of metallic burden on blast furnace process and performance parameters

作　　者：I G Tovarovskiy Y M Gordon A E Merkulov 张友平(译) 徐万仁(校) 

机构地区：[1]乌克兰国家科学院钢铁研究所,乌克兰49050 [2]Hatch,加拿大L5K2R7 [3]不详

出　　处：《世界钢铁》2013年第5期1-7,共7页World Iron & Steel

摘　　要：针对不同金属化率的炉料,采用离散物料平衡和热平衡系统,描述了铁矿在高炉内还原和熔化过程中的传热和传质。该计算模型将高炉在垂直方向分为12层,沿半径方向分成10圈。结果表明,随着炉料金属化率的提高,直接还原所需的热量和热流比减少,导致高炉下部传热强度降低,这可使高炉下部高度增加而上部高度减小。煤气等温线上移,炉顶热损失增加。同时,软熔带上移,区间扩大,布料对高炉操作参数的影响减弱。由于直接还原度的降低,喷吹天然气对焦比的影响减小。当炉料金属化率大于20%时,金属化炉料的使用并不能降低焦比。The system of discrete material and thermal balances in the radial annular cross-sections for 12 vertical and 10 radial ring zones is used to describe the heat and mass transfer processes of iron ore reduction and melting in blast furnace with respect to the various degree of preliminary metallization of the metallic burden. It was found that with increase in preliminary metallization degree the heat demand on direct reduction and the ratio between material and gas flow heat capacities are reduced, which leads to the decrease in intensity of a heat transfer in the bottom segment of the furnace. As a result, the height of the bottom segment of blast furnace is increased, while the height of the upper segment is decreased. The gas isotherms move upwards, increasing heat losses through the furnace top. The cohesive zone also moves up and increases in size. The influence of material distribution at the furnace top on parameters of blast furnace operation becomes weaker. Because of the decrease in the extent of direct reduction, the effect of natural gas injection on coke rate is also reduced. As a result the reduction in coke rate associated with the preliminary metallization of the metallic burden could not be fully realized if the burden metallization degree is greater than 20%.

关 键 词：炉料 金属化率 高炉 物料平衡和热平衡 模型 环形区 柱状区 综合平衡 

分 类 号：TF538.63[冶金工程—钢铁冶金]