Citation

Qu J, Deng J, Wang Q. China Saf. Sci. J. 2019; 29(7): 51-57.

Copyright

(Copyright © 2019, China Occupational Safety and Health Association, Publisher Gai Xue bao)

DOI

10.16265/j.cnki.issn1003-3033.2019.07.009

PMID

unavailable

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 CD, oxygen concentration CO2 and average particle size of dust d50 on explosion parameters (maximum explosion pressure Pmax, maximum pressure rise rate (dP/ dt)max and explosion rate Kst) 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 Pmax increases first and then decreases while (dP/ dt)max and Kst increase with the increase of CD, and it will be strongly explosive when the CD reaches 2 000 g/ m3, in the oxygen-poor environment, with the decrease of CO2, the oxidation rate of ultrafine aluminum powder, the heat released and Pmax 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 Pmax and (dP/ dt)max also will decrease with as the dust particle size of dust grows when the oxygen concentration maintains the same. © 2019 China Safety Science Journal. All rights reserved.

Language: zh