Numerical Simulation of Coal Spontaneous Combustion around a Borehole Induced by Negative Pressure Gas Drainage

Figure 5

Coal temperature cloud maps around a gas borehole at suction pressures of (a) 18 kPa, (b) 23 kPa, (c) 30 kPa, and (d) 35 kPa.

(a)

(b)

(c)

(d)