“…Besides, the content of the combustible gas produced by pyrolysis of the large particle size and low volatile coal dust is correspondingly small during the explosion. Therefore, the addition of the same concentration of gas has a more significant effect on the concentration of the combustible gas in the system after the pyrolysis of large particle size and low volatile coal dust. , As a result, the lower explosion limit of the large particle size and low volatile coal dust decreased more.…”