Module 2: Combustion and heat utilization
  Lecture 10: Material balance in combustion
 


Amount and %composition of POC:

POC
Kg moles

Analysis of POC in % Wet basis

% analysis (dry basis)
Orsat analysis

CO2

6.33

17.67

18.31

18.49**

H20

1.25
3.49

-

-
N2

28.18

78.67

81.51

81.51
   SO2

0.0625
0.7
0.18
-
Total
35.82
100.00
100.00
100

** Orsat analysis does not report SO2 separately, therefore contains %SO2 as well

Note: Orsat analysis would have resulted into POC analysis as given in column 5 of the above table. Orsat analysis of the POC will report  CO2 and N2  only.  Orsat analysis is also on dry basis. This aspect must be understood while solving material balance problems on combustion

Now suppose 20% excess air is used