2025 Volume 71 Issue 4 Pages 177-182
In this study, dust explosion of coal or charcoal mixed with wood powder was evaluated using a 1.2 L Hartmann apparatus. For particles smaller than 53 µm, the minimum explosion concentration (MEC) of wood dust and coal was 40 g/m3, indicating a high risk of dust explosion. Charcoal did not explode above 1000 g/m3, it was considered to be caused by the carbon and volatile matter contents. For coal mixed with wood powder, the minimum ignition energy (MIE) of 25 wt% wood was the lowest. Coal was considered to act as a dispersant for wood powder, as the degree of cohesion in 25 wt% wood mixture was almost the same as that in coal. For charcoal mixed with wood, the both MEC and MIE values were decreased depending on the wood powder ratio.
