3. Air Requirement
• C + O2 CO2
(12) (32) (44)
• 2H2 + O2 2 H2O
(4) (32) (36)
• S + O2 SO2
(32) (32) (64)
4. Example
Determining air requirement for complete Combustion
Determine the air requirement expressed in kilogram per tonne of
waste for the complete oxidation of waste with formula
C(50)H(100)O(40)N
5. Determining combustion heat balance
• Determine heat available in exhaust gas from combustion of 100 tonnes/d of
solid waste with energy content of 10.500kJ/kg and following composition(% by
mass).
• Carbon- 28
• Hydrogen-5
• Oxygen-22
• Nitrogen-4
• Sulfer-1
• Water-20
• Inert-20
• Assume incinerator residue contain 5% carbon and temperature entering air and
residue from the grate are 25C and 425 C, respectively.
6. Type of losses
Reactor
• Unburned carbon
• Radiation
Latent heat
• Inherent moisture
• Moisture from bound water
• Moisture from oxidation of net hydrogen
Sensible heat
• In residue
• Stack gases
