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
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