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首页> 外文期刊>ISIJ international >Evaluation of Coke Mixed Charging Based on Packed Bed Structure and Gas Permeability Changes in Blast Furnace by DEM-CFD Model
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Evaluation of Coke Mixed Charging Based on Packed Bed Structure and Gas Permeability Changes in Blast Furnace by DEM-CFD Model

机译：基于填充床结构和高炉煤气渗透率变化的焦炭混合装料DEM-CFD模型评估

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摘要

Low reducing agent operation of the blast furnace has an important role in mitigating carbon dioxide emissions in the steel works. Low reducing agent operation results in a low coke rate in the blast furnace. In low coke rate operation, the permeability in the blast furnace is considered to change remarkably due to the increase in the ore-to-coke (0/C) ratio. Charging methods based On conventional layered charging should be improved to a new method such as coke mixed charging. In this study, a DEM-CFD model considering the softening behavior of ore particles in the cohesive zone was applied to evaluate the gas flow in low coke rate operation. First, the softening melting test was simulated by the overlapping of particles in DEM. The layer structure and void fraction distribution in the blast furnace were calculated for normal coke rate and low coke rate operation by DEM. Second, gas flow behavior was analyzed by the DEM-CFD model, focusing on the cohesive zone. From the results, it was estimated that the gas flow was influenced by the coke slit structure in the cohesive zone and the permeability of ore layers mixed with coke particles. Under the normal coke rate of 350 kg/t, coke mixed charging has little effect on permeability through the thin coke slit. However, in low coke rate operation, coke mixing can improve the permeability of the cohesive zone.
机译：高炉的低还原剂操作在减轻钢铁厂的二氧化碳排放方面具有重要作用。低还原剂操作会导致高炉中的焦炭率降低。在低焦炭运行中，由于矿石与焦炭（0 / C）比的增加，高炉的渗透性被认为发生了显着变化。基于常规分层装料的装料方法应改进为一种新方法，例如焦炭混合装料。在这项研究中，考虑了粘性区域中矿石颗粒的软化行为的DEM-CFD模型被用于评估低焦比运行中的气体流量。首先，通过DEM中颗粒的重叠来模拟软化熔融测试。通过DEM计算了正常焦化速率和低焦化速率下的高炉层结构和空隙率分布。其次，通过DEM-CFD模型分析了气体流动行为，重点是内聚区。从结果可以估计，气体流量受粘结区的焦缝结构和掺有焦炭颗粒的矿石层渗透性的影响。在正常焦炭量为350 kg / t的情况下，焦炭混合装料对通过细焦炭缝的渗透率影响很小。然而，在低焦炭速率操作中，焦炭混合可以改善粘结区的渗透性。

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  • 来源
    《ISIJ international》 |2012年第11期|p.1990-1999|共10页
  • 作者

    Shouhei MATSUHASHI; Hiroyuki KUROSAWA; Shungo NATSUI; Tatsuya KON; Shigeru UEDA; Ryo INOUE; Tatsuro ARIYAMA;

  • 作者单位

    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, 980-8577 Japan;

    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, 980-8577 Japan;

    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, 980-8577 Japan;

    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, 980-8577 Japan;

    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, 980-8577 Japan;

    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, 980-8577 Japan;

    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, 980-8577 Japan;

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

    ironmaking; blast furnace; mathematical model; cohesive zone; low coke rate; discrete ele-ment method; computational fluid dynamics;

    机译：炼铁高炉;数学模型;粘结区焦炭率低;离散元法计算流体动力学;

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