Conversion formula for coal calorific value (coal calorific value)

Qgr. daf (MJ/kg)=31.45+1.09Hdaf

Anthracite and bituminous coal with Vdaf less than 24%:

Hdaf=Vdaf/(0.1462Vdaf+1.1124)

Bituminous coal:

Hdaf=2.888+0.392 (√ Vdaf) -0.0023Ad

Lignite:

Lignite: Hdaf=0.835Vdaf+1.206

In the formula:

Hdaf=Hard × {100/(100 Ma d Aad)} Dry ash free hydrogen content%

Vdaf=Vad × {100/(100 Ma d Aad)} Dry ash free base volatile matter yield%

Aad=(m1/m) × one hundred

Among them: m1- mass of residue, g;

M - mass of air dried coal sample, g;

Vad=(m1/m) × 100% volatile matter yield of air dried coal sample

Mad=(m1/m) × 100% moisture yield of air dried coal sample

Among them: m1-- Mass lost after coal sample drying, g;

M - mass of air dried coal sample, g;

Ad=Aad × 100/(100 Ma d) dry coal sample ash yield%;

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