Numerical simulation of impact and solidification of melting dust on spherical bead surface and experimental validation
Chuan-ping Liu1, Bin-jie Li1, Li Wang1,2, Shao-wu Yin1, Li-ge Tong1,2
1 School of Energy and Environment Engineering, University of Science and Technology Beijing, Beijing 100083, China
2 Beijing Engineering Research Centre of Energy Saving and Environmental Protection, Beijing 100083, China
Numerical simulation of impact and solidification of melting dust on spherical bead surface and experimental validation
Chuan-ping Liu1, Bin-jie Li1, Li Wang1,2, Shao-wu Yin1, Li-ge Tong1,2
1 School of Energy and Environment Engineering, University of Science and Technology Beijing, Beijing 100083, China
2 Beijing Engineering Research Centre of Energy Saving and Environmental Protection, Beijing 100083, China
摘要 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.
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.
Chuan-ping Liu,Bin-jie Li,Li Wang, et al. Numerical simulation of impact and solidification of melting dust on spherical bead surface and experimental validation[J]. Journal of Iron and Steel Research International, 2019, 26(7): 679-690.
2019, Vol. 26 
