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Modeling of the molten blast furnace slag particle deposition on the wall including phase change and heat transfer

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  • Feng, YanHui
  • Gao, Jie
  • Feng, Daili
  • Zhang, XinXin

Abstract

The blast furnace slag with extremely high discharge temperature is a by-product in iron and steel production process. Dry granulation method based on rotary disk atomizer shows great advantages in recovering sensible heat of blast furnace slag. However, during flight process, molten particles may impact on the wall which would greatly affect the stability of the device and the overall heat transfer efficiency. Moreover, during the deformation process of molten slag with high temperature and complex components, its physical properties change dramatically. In the current study, combining the volume-of-fluid method and solidification/melting model to track the free interface and deal with the phase change respectively, a three-dimensional symmetrical model was constructed to simulate the thermal process of molten particle collision. The solidification temperature range and variable physical properties were taken into consideration. As the results, the temperature and velocity distributions, spread factor, solidification time were obtained. And the effects of diameter, initial temperature, impact velocity of particles and initial temperature of the wall on the process were discussed. It was represented that a single slag particle impacting on the wall underwent process of spreading, retracting, and stabilizing. Two dimensionless correlations were developed to predict deformation behavior of slag particle and the maximum value of wall shear stress. Furthermore, the sequential impact of two slag particles with the same diameter was investigated and splashing and remelting occurred.

Suggested Citation

  • Feng, YanHui & Gao, Jie & Feng, Daili & Zhang, XinXin, 2019. "Modeling of the molten blast furnace slag particle deposition on the wall including phase change and heat transfer," Applied Energy, Elsevier, vol. 248(C), pages 288-298.
    • Handle: RePEc:eee:appene:v:248:y:2019:i:c:p:288-298
    DOI: 10.1016/j.apenergy.2019.04.100
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    References listed on IDEAS

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    1. Zhang, Hui & Wang, Hong & Zhu, Xun & Qiu, Yong-Jun & Li, Kai & Chen, Rong & Liao, Qiang, 2013. "A review of waste heat recovery technologies towards molten slag in steel industry," Applied Energy, Elsevier, vol. 112(C), pages 956-966.
    2. Wang, Hong & Wu, Jun-Jun & Zhu, Xun & Liao, Qiang & Zhao, Liang, 2016. "Energy–environment–economy evaluations of commercial scale systems for blast furnace slag treatment: Dry slag granulation vs. water quenching," Applied Energy, Elsevier, vol. 171(C), pages 314-324.
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    Cited by:

    1. Wu, Junjun & Tan, Yu & Li, Peng & Wang, Hong & Zhu, Xun & Liao, Qiang, 2022. "Centrifugal-Granulation-Assisted thermal energy recovery towards low-carbon blast furnace slag treatment: State of the art and future challenges," Applied Energy, Elsevier, vol. 325(C).
    2. Zhang, Huining & Dong, Jianping & Wei, Chao & Cao, Caifang & Zhang, Zuotai, 2022. "Future trend of terminal energy conservation in steelmaking plant: Integration of molten slag heat recovery-combustible gas preparation from waste plastics and CO2 emission reduction," Energy, Elsevier, vol. 239(PE).
    3. Genevieve Soon & Hui Zhang & Adrian Wing-Keung Law & Chun Yang, 2023. "Computational Modelling on Gasification Processes of Municipal Solid Wastes Including Molten Slag," Waste, MDPI, vol. 1(2), pages 1-19, April.
    4. Tan, Yu & Wang, Hong & Zhu, Xun & Lv, Yi-Wen & Ding, Yu-Dong & Liao, Qiang, 2020. "Film fragmentation mode: The most suitable way for centrifugal granulation of large flow rate molten blast slag towards high-efficiency waste heat recovery for industrialization," Applied Energy, Elsevier, vol. 276(C).
    5. Li, Qiang & Wang, Qian & Zhang, Jiansheng & Wang, Weiliang & Liu, Jizhen, 2021. "Transition temperature and thermal conduction behavior of slag in gasification process," Energy, Elsevier, vol. 222(C).

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