Date of Publication:2022-10-06

Journal:爆炸与冲击

Affiliation of Author(s):化工学院

Volume:38

Issue:1

Page Number:92-97

ISSN No.:1001-1455

Abstract:A modified 20 L standard spherical dust explosion vessel was used to systematically study the explosion characteristics of the methane/lycopodium hybrid mixtures.The explosion pressure (pex),the explosion pressure rise rate (dp/dt)ex and the explosive deflagration index (Kst) of the single-phase methane,the single-phase lycopodium dust,and the methane/lycopodium hybrid mixtures were measured under the same initial conditions.The results showed that methane could obviously enhance the explosion pressure pex of low-concentration lycopodium dust but reduce the pexof highconcentration lycopodium dust.It was proved that methane had no significant effects on the maximum explosion pressure pmax of lycopodium dust.But it could significantly increase the maximum explosion pressure rise rate (dp/dt) By evaluating the Kst,it was found that the explosive deflagration index of the methane/lycopodium hybrid mixtures was higher than that of single-phase lycopodium dust.However,the explosive deflagration indices of both methane/lycopodium hybrid mixtures and singlephase lycopodium dusts were lower than that of single-phase methane.Therefore,the coexistence of combustible gas and combustible dust in industrial production process should be avoided to reduce the risk of dust explosions.

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