Date of Publication:2022-10-09

Journal:爆炸与冲击

Affiliation of Author(s):化工学院

Issue:6

Page Number:669-672

ISSN No.:1001-1455

Abstract:The aluminum powder of 2 μm particle size was taken as the medium and a series of dust explosion relief experiments were carried out by linking the steel relief pipes with 25 mm internal diameter to the top of the cylindrical steel vessel with 68 mm internal diameter and 305 mm height. The steel relief pipe length and the dust mass concentration were adjusted, respectively, to investigate the pressure characteristics in the vessel and the relief pipe and to explore principally the secondary explosion-induced condition in the explosion relief process. Experimental results demonstrate that secondary explosion may occur when the relief pipe length and dust mass concentration are no less than 1500 mm and 500 g/m3, respectively. The pressure waves induced by secondary explosion propagate toward both the vessel and the relief pipe end. The pressure waves propagating toward the vessel disturb the relief process and induce the residual unburnt combustible mixture in the vessel react. Hence, secondary pressure peak appears in the vessel.

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