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Dry coal

C - 75%

H - 5%

O - 8%

Ash - 12 %

Basis : 1 Kg coal

Coal analysis

Components wt% Kg M.W kmol
C 75 0.75 12 0.0625
H 5 0.05 1 0.05
O 8 0.08 16 0.005
Ash 12 0.12 - -
Total 100 1    

The reactions are

C + O_{2}\rightarrow CO_{2}

2H +-02 + H2O 2

30% excess air is used

O2 required = 0.0625 + 0.05(0.25) -(0.005/2) = 0.0725 kmol

O2 supplied = 0.0725 (1.3) = 0.09425 kmol

Air supplied = (0.09425/0.21) = 0.448809 kmol

Orsat analysis

Components kmol mol%
CO2 0.0625 14.24
O2 0.09425 -(0.0725) = 0.02175 4.956
N2 0.448809(0.79) = 0.354559 80.803
Total 0.438809 100

C)

For 1 Kg coal dry flue gas = 0.438809(1000) = 438.809 moles

For 100 moles of dry gas , coal supplied = 0.22788 Kg

D)

Refuse obtained for 438.809 moles dry flue gas = 0.12 Kg

For 100 moles dry flue gas

Refuse obtained = 0.027346 Kg

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