Experimental Study on Ignition and Explosion of Carbon Material Dust

doi:10.12068/j.issn.1005-3026.2023.02.019

Abstract

Abstract: In order to clarify the dust explosion hazard of carbon materials， the explosiveness of 6 kinds of carbon dust materials was studied according to 3 standards. According to VDI 2263-1—1990， the low-carbon earthy graphite， the pigment carbon black and the conductive carbon black are explosive dust， low-carbon flake graphite， high-carbon flake graphite， and high-carbon earthy graphite are non-explosive dust. According to ASTM E 1226 and GB/T 16425—2018， all the 6 kinds of samples are explosive. The sensitivity characteristics of various samples were tested according to the existing test standards， the 6 types of powder dust clouds was not fired，but the dust layer of conducting charcoal black and pigment charcoal black fired at 450℃. By using the TG-DSC method ， it is found that high-carbon flake graphite， high-carbon earthy graphite and conductive carbon black experienced an oxidative exothermic reaction in the air atmosphere， with a starting temperature of 770， 680， 500℃ respectively. The explosiveness of graphite and carbon black depend on the ignition energy， and explosion will occur if it exceeds 10kJ. Although the fire sensitivity of graphite and carbon black dust is very low， there still exists fire risk.

Key words: carbon material; dust explosion hazard; explosibility; sensitivity characteristics; ignition energy

CLC Number:

X932

LI Gang， LIU Zong-yang， CHANG Wei-da， ZHANG Xiao-yu. Experimental Study on Ignition and Explosion of Carbon Material Dust[J]. Journal of Northeastern University(Natural Science), 2023, 44(2): 298-304.

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