Table 2 Evaluation of coal spontaneous combustion tendency grade when coal sample oxygen absorption Vd > 18%.

From: Research on the effect of water-cooling steel pipe on preventing spontaneous combustion of coal pile and its thermal migration behavior

Grade of spontaneous combustion tendency

Spontaneous combustion tendency

Oxygen absorption of coal Vd (cm3/g dry coal)

I

Easy spontaneous combustion

Vd > 0.7

II

Self-ignite

0.4 < Vd ≤ 0.7

III

Not easy to spontaneous combustion

Vd ≤ 0.4

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