摘要：为了评价惰性介质对煤粉着火爆炸危险性的影响,保证安全生产,采用Godbert-Greenwald恒温炉装置研究分散压力,惰性介质NH₄H₂PO₄、KH₂PO₄、Ca(H₂PO₄)₂、CaCO₃粉体的含量及NH₄H₂PO₄、CaCO₃粉体的粒径对煤粉尘云最低着火温度的影响。结果表明:高分散压力对煤粉尘云的影响更显著,最佳分散压力为0.03 MPa,此时煤粉尘云的最低着火温度最低,为594℃;随着惰性介质含量的增大,煤粉尘云的最低着火温度升高,并且存在突变浓度,NH₄H₂PO₄、KH₂PO₄、Ca(H₂PO₄)₂粉体的突变浓度(质量分数)为28.6%,CaCO₃的为33.3%;惰性介质按对煤粉尘云最低着火温度的抑制效果由强到弱的顺序为NH₄H₂PO₄、Ca(H₂PO₄)₂、KH₂PO₄、CaCO_3；煤粉尘云的最低着火温度随惰性介质粒径的减小而升高,CaCO₃粉体粒径变化对抑制效果的影响大于NH₄H₂PO₄的。

关键词：煤粉；最低着火温度；惰性介质

Abstract： To evaluate the influence of inert mediums on explosion hazard of coal dust， and ensure safety in production， Godbert-Greenwald furnace apparatus was used to study the influence of diffusing pressure， content of inert mediums NH₄H₂PO₄， KH₂PO₄， Ca(H₂PO₄)₂ and CaCO₃ powders， as well as particle size of NH₄H₂PO₄ and CaCO₃ powders on minimum ignition temperature of coal dust cloud. The results show that the effect of high diffusing pressure is more significant， and the best diffusing pressure is 0.03 MPa. The minimum ignition temperature of coal dust cloud is the lowest， which is 594 ℃ at this diffusing pressure. The minimum ignition temperature of coal dust cloud increases with the increase of inert mediums content， and there are mutation concentrations. The mutation concentrations （mass fraction） of NH₄H₂PO₄， KH₂PO₄ and Ca(H₂PO₄)₂powders are all 28.6 % ， that of CaCO₃ is 33.3% . According to the inhibition effect of inert mediums to the minimum ignition temperature of coal dust cloud， the order from strong to weak of the inert mediums isNH₄H₂PO₄， Ca(H₂PO₄)₂， KH₂PO₄， and CaCO₃. The minimum ignition temperature of coal dust cloud increases with the decrease of the inert medium particle size. The influence of size change of CaCO₃ powders on inhibition effect is more obvious than that of NH₄H₂PO₄． 

Keywords: coal dust； minimum ignition temperature； inert medium