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Spontaneous Combustion of Coal 351
Figure 21.3 Predicted versus experimental minimum self-heating temperatures (SHTs) of
bituminous coals.
160
140
120
Temperature (°C) 100
80
60 16°C/h 8°C/h 4°C/h 2°C/h
40
0 2 4 6 8 10 12 14 16 18
Time (hours)
QLD1 QLD2 QLD3 QLD4 QLD5 NSW1 NSW2
Figure 21.4 Temperature rise Vs oxidation time for Australian coals. [3]
In general, dT decreases with the rank of coal and has a corresponding higher value of
dt
SHT. E (K cal/mol) and A Kelvin also appear to increase with the rank of coal.
s
