Fuels and Combustion
Low temperature oxidation of coal is accelerated by the

Absence of porous or friable particles
All of these
Storage in large heaps
Storage in compressed piles

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Fuels and Combustion
Rate of low temperature oxidation of coal due to bad storage conditions

Is accelerated by storage in large heaps with small surface to volume ratio
Is more for low volatile coal compared to high volatile coal
Decreases with increase in surface area
Does not vary with increase in surface area

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