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논문

게시판 상세페이지
Effect of Powder Condition on the Fire and Explosion Characteristics of Suspended and Deposited Dusts 2024.01.04
저자: Han, Ou-Sup

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Abstract
An experimental investigation was conducted on the influences of median size, dust concentration,
dust condition (cloud and layer) for the fire and explosion hazard assessment of dusts with the same
powder property. For this purpose, tests have been performed in accordance with 20 L explosion sphere,
thermogravi- metric analyze, combustion rate tester (UN method). We investigated the explosion
characteristics and flame propagation velocity (FPV) in dust cloud and the flame spread velocity(FSV) over
dust layer on 8 dust samples with different particle sizes of 4 types of dusts (Sugar, Mg, Al, Zr). An explosion
hazard increased with decreasing particle size in Mg and Al dust clouds, but sugar did not show the effect
of explosion hazard due to particle size change in dust clouds. The flame propagation velocity (FPV) of
suspended dusts increased significantly when the particle size decreased from micro to nano than the
variation of particle size in micro range. The flame spread velocity (FSV) over dust layer showed a tendency
to increase over the inclined dust layers (30° slope) rather than the horizontal dust layers (0° slope).
The flame spread rate (FSV) over dust layers increased on the inclined dust layer (30° slope) rather than
the horizontal dust layer (0° slope) and was higher upward flame than the downward flame in condition
of inclined dust layers(30° slope).
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