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首页> 外文期刊>International Journal of Heat and Mass Transfer >Model study of the effect of particles structure on the heat and mass transfer through the packed bed in ironmaking blast furnace
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Model study of the effect of particles structure on the heat and mass transfer through the packed bed in ironmaking blast furnace

机译：炼铁高炉中颗粒结构对填料床传热传质影响的模型研究

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摘要

Ironmaking technology is currently focused on the introduction of the decreased reducing agent operation of a blast furnace in order to decrease C02 emissions. Because the coke ratio is reduced in this operation, causing a huge pressure drop, it has become increasingly important to understand the in-furnace phenomena using the non-empirical method. In this study, the DEM-CFD simulation was carried out to analyze the heat and mass transfer between the gaseous phase and the particles in a packed bed. In particular, the effect of recently proposed helical structure of coke and ore layers was compared with the traditional layer-by-layer structure. This comparison shows that the helical structure is effective for the smooth gas flow in the packed bed. It was found that the increase of the gas flow rate in a large grain size coke layer, would not affect the total permeability of the packed bed. Since the helical structure decreases the amount of inflow of the gaseous phase to the ore bed, the reduction rate of this ore tends to decrease the thickness of the layered structure, but this effect is relatively small. The helical structure becomes more permeable, if a thicker layer is maintained even under the decreased coke ratio condition.
机译：炼铁技术目前集中在引入高炉还原剂减少的操作上，以减少二氧化碳的排放。由于在该操作中降低了焦炭比，从而导致巨大的压降，因此使用非经验方法来理解炉内现象变得越来越重要。在这项研究中，进行了DEM-CFD模拟以分析填充床中气相与颗粒之间的传热和传质。特别地，将最近提出的焦炭和矿石层的螺旋结构的效果与传统的逐层结构进行了比较。该比较表明，螺旋结构对于填充床中的平稳气流是有效的。已经发现，在大颗粒尺寸的焦炭层中气体流速的增加不会影响填充床的总渗透率。由于螺旋结构减少了气相流向矿石床的量，因此该矿石的还原率趋于减小层状结构的厚度，但是这种效果相对较小。如果即使在降低焦炭比的条件下仍保持较厚的层，则螺旋结构将变得更易于渗透。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2015年第12期|1176-1186|共11页
  • 作者

    Shungo Natsui; Hifumi Takai; Ryota Nashimoto; Tatsuya Kikuchi; Ryosuke O. Suzuki;

  • 作者单位

    Division of Materials Science and Engineering, Faculty of Engineering, Hokkaido University, Kita13-Nishi8, Kita-ku, Sapporo 060-8628, Japan;

    Division of Materials Science and Engineering, Faculty of Engineering, Hokkaido University, Kita13-Nishi8, Kita-ku, Sapporo 060-8628, Japan;

    Division of Materials Science and Engineering, Faculty of Engineering, Hokkaido University, Kita13-Nishi8, Kita-ku, Sapporo 060-8628, Japan;

    Division of Materials Science and Engineering, Faculty of Engineering, Hokkaido University, Kita13-Nishi8, Kita-ku, Sapporo 060-8628, Japan;

    Division of Materials Science and Engineering, Faculty of Engineering, Hokkaido University, Kita13-Nishi8, Kita-ku, Sapporo 060-8628, Japan;

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

    Ironmaking blast furnace; DEM-CFD simulation; Packed bed; Decreased coke ratio; Pressure drop; Reduction rate;

    机译：炼铁高炉;DEM-CFD仿真;床铺焦炭比降低;压力下降;减少率;

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