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链箅机回转窑球团热废气循环工艺及数值模拟研究

何璐瑶 王鑫 胡兵 甘敏 朱亮 魏进超 代友训

何璐瑶, 王鑫, 胡兵, 甘敏, 朱亮, 魏进超, 代友训. 链箅机回转窑球团热废气循环工艺及数值模拟研究[J]. 钢铁钒钛, 2021, 42(4): 85-91. doi: 10.7513/j.issn.1004-7638.2021.04.015
引用本文: 何璐瑶, 王鑫, 胡兵, 甘敏, 朱亮, 魏进超, 代友训. 链箅机回转窑球团热废气循环工艺及数值模拟研究[J]. 钢铁钒钛, 2021, 42(4): 85-91. doi: 10.7513/j.issn.1004-7638.2021.04.015
He Luyao, Wang Xin, Hu Bing, Gan Min, Zhu Liang, Wei Jinchao, Dai Youxun. Recirculating process of pellet exhaust gas from grate-kiln and numerical simulation[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(4): 85-91. doi: 10.7513/j.issn.1004-7638.2021.04.015
Citation: He Luyao, Wang Xin, Hu Bing, Gan Min, Zhu Liang, Wei Jinchao, Dai Youxun. Recirculating process of pellet exhaust gas from grate-kiln and numerical simulation[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(4): 85-91. doi: 10.7513/j.issn.1004-7638.2021.04.015

链箅机回转窑球团热废气循环工艺及数值模拟研究

doi: 10.7513/j.issn.1004-7638.2021.04.015
基金项目: 湖南省自然科学基金(2019JJ51007)资助项目
详细信息
    作者简介:

    何璐瑶(1983−),硕士研究生,主要从事烧结球团领域专利情报分析工作,E-mail:heluyao@cie-cn.com

    通讯作者:

    王鑫(1996−),硕士研究生,主要从事冶金过程数值模拟的研究,E-mail:xingxiang@csu.edu.cn

  • 中图分类号: TF046,X756

Recirculating process of pellet exhaust gas from grate-kiln and numerical simulation

  • 摘要: 针对链箅机回转窑环冷机生产过程中废气外排量大、余热利用率低的问题,在原有废气循环的基础上,提出了一种将过渡预热段的热废气循环到环冷机二段的废气循环工艺,并对新模式下的球团冷却过程进行模拟仿真研究。基于计算流体力学理论基础,结合局部非热力学平衡理论和磁铁矿氧化反应模型,采用CFD软件建立了数值仿真模型,揭示了废气循环对球团冷却的影响规律。研究结果表明,采用新的烟气循环系统之后,冷却二段的废气温度从511 ℃提高到523 ℃,提高了热利用效率。采用该废气循环模式,可减少废气排放11.5%,循环回收热量占球团生产热量总支出的3.45%。为球团生产进一步节能减排提供了新的方向,对于球团清洁生产具有重要意义。
  • 图  1  链箅机-回转窑-环冷机过程示意

    Figure  1.  Process diagram of grate-kiln ring cooler

    图  2  环冷机台车几何模型

    Figure  2.  Geometric model of circular cooler car

    图  3  环冷机球团温度云图

    图中各颜色对应的温度见右侧温度标尺

    Figure  3.  Pellet temperature contour in circular cooling machine

    图  4  环冷二段和三段末台车高度方向上的温度云图

    Figure  4.  Temperature contour in the height direction of the second and third section in the circular cooling machine

    图  5  循环前后环冷机二段、三段末球团温度对比

    Figure  5.  Comparison of pellet temperatures of the second and third section in the circular cooling machinebefore and after the cycle

    表  1  TPH段风箱废气组成

    Table  1.   Composition of bellows waste gas in TPH section

    风箱号O2/%NO×106SO2×106CO2/%温度/℃
    6#19.251161320.7154
    7#19.8570650.5170
    8#17.222682951.7215
    下载: 导出CSV

    表  2  球团矿物性参数

    Table  2.   Pellet property parameters

    球团矿密度 /(kg·m−3)球团矿比表面积/(m2·m−3)球团半径/mm料床孔隙率/%料床导热系数/
    [J·(m·s·K)−1]
    2400303140.43.0
    下载: 导出CSV

    表  3  温度模拟值和实测值比较

    Table  3.   Comparison between the simulated and measured temperature values

    模拟值/℃实测值/℃误差/%
    一段烟罩中心930902+3.1
    二段烟罩中心517536−3.5
    三段烟罩中心303281+7.8
    下载: 导出CSV

    表  4  废气循环对环冷机不同位置断面平均温度的影响

    Table  4.   Influence of exhaust gas cycle on average temperature of different positions on circular cooler

    是否循环项目环冷一段环冷二段环冷三段
    初始结束平均初始结束平均初始结束平均
    未循环球团矿1238684961684334509334132233
    烟气1072656864656366511366129248
    废气循环球团矿1238684961684359522359144252
    烟气1072656864656389523389139264
    下载: 导出CSV
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出版历程
  • 收稿日期:  2020-12-11
  • 刊出日期:  2021-08-10

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