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

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

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Fuels and Combustion
A carbonaceous fuel (containing no H₂ or hydrocarbons) is burnt and the resulting flue gas contains 21% CO₂. It means that

21% excess oxygen has been used for combustion
No excess air has been used for combustion
21% excess air has been used for combustion
Complete combustion of fuel has taken place

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