Page 43 - Handbook of Energy Engineering Calculations
P. 43
2. Compute the weight of air required for complete combustion
The weight of nitrogen associated with the required oxygen = (1.493)
(0.768/0.232) = 4.95 lb (2.228 kg). The weight of air required = 4.95 + 1.493
= 6.443 lb/lb (2.899 kg/kg) of wood burned, if the air is dry. But the air
contains 0.013 lb of moisture per lb (0.006 kg/kg) of air. Hence, the total
weight of the air = 6.443 + (0.013)(6.443) = 6.527 lb (2.937 kg).
3. Compute the weight of the products of combustion
Use the following relation:
4. Convert the flue-gas weight to volume
Use, as before, the following tabulation:
In this calculation the temperature correction factor 2.15 = (absolute flue-gas
temperature, °R)/(absolute atmospheric temperature, °R) = (600 + 460)/(32 +
