KANE905 Operators Manual
Page 45
Where
K3
= [(9 x H2 + H2O) / Qgr] x 2425
Net Efficiency %
= 100 - dry flue gas losses
= 100 - 20.9 x K1n x (Tnet) / K2 x (20.9 -
O
2
m)
Gross Efficiency %
= 100 - {dry flue gas wet losses}
= 100 – {[20.9 x K1g x (Tnet) / K2 x (20.9 - O
2
m)]+
[K3 x (1 + 0.001 x Tnett)]}
Excess Air
= [(20.9% / (20.9% - 0
2
m%)) – 1] x 100%
CO2%
= [(20.9 - O2m) x K2 / 20.9]
Unburned fuel Loss %
= K4 x CO / ( CO + CO2 )
Note: CO scaled in %
Where K4
= 70 for coke
= 65 for anthracite
= 63 for Bituminous coal
= 62 for coal tar fuel
= 48 for liquid petroleum fuel
= 32 for natural gas
The formula for K4 is based on the gross calorific value Qgr. To obtain
the loss based on net calorific value multiply by Qgr/Qnet. Since this loss
is usually small this conversion has been ignored. This loss is subtracted
from the efficiency.
Oxygen Reference
CO(n) = CO x
(20.9 - O
2
r)
(20.9 - O
2
m)
