Study on explosion characteristics of ultrafine aluminum powder in a closed spherical space

doi:10.16265/j.cnki.issn1003-3033.2019.07.009

Abstract

Abstract: In order to understand the explosion hazard of ultrafine aluminum powder in a closed spherical space, its explosion characteristics under different test conditions were studied and the effects of dust concentration C_D, oxygen concentration C_O₂ and average particle size of dust d₅₀on explosion parameters (maximum explosion pressure P_max, maximum pressure rise rate (dP/dt)_max and explosion rate K_st) were analyzed by using a standard 20 L spherical explosive device. The results show that the minimum explosion concentration of ultrafine aluminum powder was in the range of 50-80 g/m³, for 100 nm aluminum powder, its P_max increases first and then decreases while (dP/dt)_max and K_st increase with the increase of C_D, and it will be strongly explosive when the C_D reaches 2 000 g/m³, in the oxygen-poor environment, with the decrease of C_O₂, the oxidation rate of ultrafine aluminum powder, the heat released and P_max and (dP/dt)_max will decrease, for aluminum powder with particle sizes of 800 nm, 2 μm and 10 μm, the powder's specific surface area will decrease, the diffusion of oxygen molecules will reduce, and P_max and (dP/dt)_max also will decrease with as the dust particle size of dust grows when the oxygen concentration maintains the same.

Key words: spherical explosive device, ultrafine aluminum powder, explosion characteristics, explosion index, oxygen concentration

CLC Number:

X932

QU Jiao, DENG Jun, WANG Qiuhong. Study on explosion characteristics of ultrafine aluminum powder in a closed spherical space[J]. China Safety Science Journal, 2019, 29(7): 51-57.

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