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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。
According to different metallization rate of charge, the discrete material balance and heat balance system is used to describe the heat transfer and mass transfer of iron ore in reduction and melting in the blast furnace. The model divides the blast furnace into 12 layers in the vertical direction and 10 turns in the radial direction. The results show that as the metallization rate increases, the amount of heat and heat flux required for direct reduction decreases, resulting in lower heat transfer strength in the lower part of the blast furnace, which increases the height of the lower part of the blast furnace and decreases the height of the upper part of the blast furnace. Gas isotherms moving up, roof heat loss increased. At the same time, the reflow belt moves up and the interval expands, and the influence of the cloth on the operating parameters of the blast furnace is weakened. Due to the reduction of direct reduction, the effect of injecting natural gas on the coke ratio is reduced. When the burden metallization rate is greater than 20%, the use of metallized charge does not reduce the coke ratio.