Experimental study on secondary explosion of aluminum powder in elbow pipeline and its suppression

doi:10.16265/j.cnki.issn1003-3033.2017.11.008

Abstract

Abstract: A laboratory system was used to test and study the key parameters of dust explosion and its suppression, as well as to analyze the effects of elbow pipeline on propagation and consequences of primary and secondary aluminum dust explosions. The secondary dust explosion of the aluminum powder was triggered by the shockwave from propane explosion. The explosion process and its suppression were then tested in the elbow tube accordingly. Results show that the pressure of the secondary dust explosion of aluminum powder blowed by shockwave was obviously higher than that of pure propane explosion, and the maximum pressure appears at the concentration of 500 g/m³. Both the propagation time and flame intensity are reduced significantly by adding anti-explosive agent, and ammonium dihydrogen phosphate is better than calcium carbonate in suppression effect.The explosion pressure decreases with the addition of ammonium dihydrogen phosphate and when the suppressant's mass fraction is 10%, the explosion is suppressed completely.

Key words: secondary dust explosion, aluminum powder, shockwave, explosion suppressant, maximum explosion pressure, elbow pipeline

CLC Number:

X932

LEI Weigang, BI Haipu, WANG Kaiquan. Experimental study on secondary explosion of aluminum powder in elbow pipeline and its suppression[J]. China Safety Science Journal, 2017, 27(11): 43-48.

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