Impact of Heat and Mass Transfer during the Transport of Nitrogen in Coal Porous Media on Coal Mine Fires

Table 3

Spontaneous combustion hazard zone of goaf.

	Air-leakage	Spontaneous combustion	Suffocation
Air inlet side of goaf	0~20 m	20 m~165 m	>165 m
Middle of goaf	0~35 m	35 m~135 m	>135 m
Air outlet side of goaf	0~12 m	12 m~145 m	>155 m