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Combustion
Efficiency and Excess Air
To
ensure complete combustion of the fuel used, combustion chambers are supplied
with excess air. Excess air increase the amount of oxygen and the probability
of combustion of all fuel.
when
fuel and oxygen in the air are in perfectly balance - the combustion is said to
be stoichiometric
The
combustion efficiency will increase with increased excess air, until the heat
loss in the excess air is larger than than the heat provided by more efficient
combustion
Typical
excess air to achieve highest efficiency for different fuels are
5
- 10% for natural gas
5
- 20% for fuel oil
15
- 60% for coal
Carbon
dioxide...
