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Numerical simulation of impact and solidification of melting dust on spherical bead surface and experimental validation

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Abstract

The impact and solidification processes of single melting tin dust at the micron scale on a spherical bead were numerically studied with hot flue gas flow. The geometrical evolution of dust impacting on hot bead and spreading without solidification involved initial spreading, retraction and oscillation, and stabilizing. The increased impact angle was found to reduce maximum spread area, weaken retraction and oscillation, and raise steady spread area. Dust impacting on cold bead completely solidified after liquid spreading and solidification without retraction and oscillation. Increased impact angle raised solidification sliding distance, whereas it reduced solidification spread area. Then, the effects of bead temperature, dust inlet velocity and size on the sliding and spreading of dust were studied, and the results indicated that increasing bead temperature, dust inlet velocity and size could raise solidification sliding distance and solidification spread area. With the dusts continually impacting on the bed, a dust layer forms at the front of bead, being different from that of solid dust, which becomes thick firstly, and then spreads from bead front to sides.

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Acknowledgements

The authors are grateful for the support of the National Key Research and Development Program of China (2016YFB061101).

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Authors and Affiliations

  1. School of Energy and Environment Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Chuan-ping Liu, Bin-jie Li, Li Wang, Shao-wu Yin & Li-ge Tong

  2. Beijing Engineering Research Centre of Energy Saving and Environmental Protection, Beijing, 100083, China

    Li Wang & Li-ge Tong

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  1. Chuan-ping Liu
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  2. Bin-jie Li
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  4. Shao-wu Yin
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Correspondence to Chuan-ping Liu.

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Liu, Cp., Li, Bj., Wang, L. et al. Numerical simulation of impact and solidification of melting dust on spherical bead surface and experimental validation. J. Iron Steel Res. Int. 26, 679–690 (2019). https://doi.org/10.1007/s42243-019-00292-0

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  • DOI: https://doi.org/10.1007/s42243-019-00292-0

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