Chegg unlock

https://www.chegg.com/homework-help/questions-and-answers/dry-coal-containing-75-c-5-h-8-o-rest-ash-burned-30-excess-air-assume-carbon-converted-co2-q65283045

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