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Published on: November 3, 2023
Multiphase Simulation of Dust-Temperature Distribution with Physicochemical Characterization of Metal Dust in Dust
Ya Chen1, Yige Liu2, Zhongan Jiang2
1School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China.
None:
Aluminum-magnesium (Al-Mg) alloy dusts, characterized by high chemical reactivity, present significant risks of occupational pneumoconiosis and dust explosions in wheel manufacturing. This study integrates experimental characterization with multiphase numerical simulations to investigate the process-dependent physicochemical properties and dynamic behaviors of Al-Mg dusts generated from machining (MA), smelting (SM), heat treatment (HT), and shot blasting (SB). Analyses of true density, BET surface area, SEM-EDS, and laser diffraction reveal distinct process-specific characteristics: HT dust exhibits the highest specific surface area (5.31 m2/g) and pronounced adsorption capacity, SB dust contains 9.19 wt.% carcinogenic Cr and the maximum true density (6.88 g/cm3), MA dust is predominantly composed of Al (77.92 wt.%), while SM and HT dusts are primarily Al-Mg-Na oxides. Particle size analysis indicates that 82-91% of particles exceed 10 μm, with those below 200 μm being explosible. Multiphase simulations elucidate strong couplings among particle size distribution, morphology, and dynamic behavior: MA dust (D[4,3] = 126.54 μm) deposits inertially; fine SM dust (D50 = 10.28 μm) is retained in inlet vortices; flaky SB dust exhibits a 25% reduction in settling velocity; and elliptical HT dust contributes to a cooler upper zone (413-415 K). These findings provide critical insights for optimizing worker protection strategies, dust explosion prevention, and dust collector design.
