Module 1: Fuels characterization and energy balance
  Lecture 3: Exercises of analysis and calorific value
 

(4) A producer gas analyses 50% N2, 25% CO, 18% H2, 6% CO2 and 1% O2. Calculate net calorific power (Kcal/m3).

Solution

(5) The ultimate analysis of bituminous  coal (dry basis %) is : C 77, H 5.8, N 1.7, O 4.8, S 2.5 and ash 9. The moisture content is 5 %.The gross calorific power is 7650 Kcal/Kg on dry basis. Calculate .

  • Gross calorific value, moist basis
  • Net calorific value, dry basis
  • Net calorific value, moist basis
  • Gross calorific value, dry basis using Dulong formula.

Solution

Dry basis

Moist basis
C
77
73.2
H
5.8
5.5
N
1
0.95
O
4.8
4.55
S
2.4
2.30
A
9
8.50
M
-
5


                            

                             

                          

                      

 The reported value is 0.95 times smaller than calculated by Dulong formula.