Comparative study of the explosion pressure characteristics of micro- and nano-sized coal dust and methane–coal dust mixtures in a pipe

International Journal of Coal Science & Technology

Bo Tan¹  Huilin Liu¹  Tian Wang¹  Bin Xu¹ 

[1] School of Emergency Management and Safety Engineering, China University of Mining and Technology (Beijing);

关键词: A pipe test apparatus;    Nano-sized;    Coal dust explosion;    Methane/coal dust explosion;    Pressure characteristics;   

DOI  :  10.1007/s40789-019-00289-w

来源: DOAJ

【 摘 要 】

Abstract Coal dust explosion accidents often cause substantial property damage and casualties and frequently involve nano-sized coal dust. In order to study the impact of nano-sized coal on coal dust and methane–coal dust explosions, a pipe test apparatus was used to analyze the explosion pressure characteristics of five types of micro-nano particle dusts (800 nm, 1200 nm, 45 μm, 60 μm, and 75 μm) at five concentrations (100 g/m3, 250 g/m3, 500 g/m3, 750 g/m3, and 1000 g/m3). The explosion pressure characteristics were closely related to the coal dust particle size and concentration. The maximum explosion pressure, maximum rate of pressure rise, and deflagration index for nano-sized coal dust were larger than for its micro-sized counterpart, indicating that a nano-sized coal dust explosion is more dangerous. The highest deflagration index K st for coal dust was 13.97 MPa/(m·s), indicating weak explosibility. When 7% methane was added to the air, the maximum deflagration index K st for methane–coal dust was 42.62  MPa/(m·s), indicating very strong explosibility. This indicates that adding methane to the coal dust mixture substantially increased the hazard grade.

【 授权许可】

Unknown