,Comparative study of the explosion pressure characteristics of micro-and nano-sized coal dust and m

• 作 者: Bo Tan Huilin Liu Bin Xu Tian Wang
• 机 构: School of Emergency Management and Safety Engineering,China University of Mining and Technology(Beij
• 出 处: 国际煤炭科学技术学报（英文）
• 发表日期: 2020年1期
• 关键词: A pipe test apparatus Nano-sized Coal dust explosion Methane/coal dust explosion

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 tm,60 tm,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 Kst for coal dust was 13.97 MPa/(m.s),indicating weak explosibility.When 7％ methane was added to the air,the maximum deflagration index Kst 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.