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Mathematical model of direct reduction in multilayer pellets made of metallurgical dust in a rotary hearth furnace

机译：旋转炉底炉中直接还原由冶金粉尘制成的多层球团的数学模型

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摘要

A mathematical model of direct reduction of metallurgical dust pellet layers has been established in a rotary hearth furnace. The effects of radiation shielding of the upper layer to lower layer and the heating effects of the hearth were considered in the model. The control equations of the model were discretized into algebraic equations based on the control volume integration method and numerically solved by the alternating direction implicit method. The effects of pellet arrangement, furnace temperature, and the height of the pellet layer were investigated by the model. The results show that staggered arrangement of metallurgical dust pellets can improve average temperature of pellet layer. Thus, the degree of metallization and zinc removal rate of the pellet layer are improved. With the increase of furnace temperature, degree of metallization increases rapidly. Compared with iron oxide reductions, furnace temperature has less effect on zinc removal rate. With the height of pellet bed increasing to four layers, both degree of metallization and zinc removal rate of the fourth layer are slightly higher than that of the third layer. After heating for 15 min, extending heating time has little influence on zinc removal rate of each layer.
机译：在回转炉膛炉中建立了直接还原冶金粉尘颗粒层的数学模型。在模型中考虑了上层到下层的辐射屏蔽效果以及炉膛的加热效果。基于控制体积积分方法，将模型的控制方程离散为代数方程，并通过交替方向隐式方法进行数值求解。通过该模型研究了颗粒排列，炉温和颗粒层高度的影响。结果表明，冶金粉尘颗粒的交错排列可以提高颗粒层的平均温度。因此，提高了颗粒层的金属化程度和锌去除率。随着炉温的升高，金属化程度迅速提高。与氧化铁还原相比，炉温对锌去除率的影响较小。随着粒料床高度增加到四层，第四层的金属化程度和锌去除率均略高于第三层。加热15分钟后，延长加热时间对各层的锌去除率几乎没有影响。

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  • 来源
    《Heat transfer》 |2017年第8期|1443-1459|共17页
  • 作者

    Ying Liu; Wen Zhang; Zhongmu Zhou; Yang Xu; Long Wang;

  • 作者单位

    Chongqing Academy of Metrology and Quality Inspection, Chongqing, 401123, China;

    Chongqing Academy of Metrology and Quality Inspection, Chongqing, 401123, China;

    Chongqing Academy of Metrology and Quality Inspection, Chongqing, 401123, China;

    Chongqing Academy of Metrology and Quality Inspection, Chongqing, 401123, China;

    Chongqing Academy of Metrology and Quality Inspection, Chongqing, 401123, China;

  • 收录信息 美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    direct reduction; mathematical model; multilayer bed; rotary hearth furnace;

    机译：直接还原数学模型;多层床旋转炉床炉;

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