Owner manual

KM9106 Operators Manual
65
Calculated data: Tnet = Net Temperature
% CO
2
content in flue gas
% Dry Flue Gas losses
% Wet losses
% Unburned carbon loss
% Efficiency
%CO
2
= (20.9 - %O
2
m) x K2 / 20.9
Tnet = Flue Temperature - Inlet Temperature
Dry flue gas loss = 20.9 x K1n x (Tnet) / K2 x (20.9 - %O
2
m)
Wet loss = 9 x %H
2
+ %H
2
O / Qgr x [2488 + 2.1Tf - 4.2 Ti]
simplified = [(9 x %H
2
+ %H
2
O) / Qgr] x 2425 x [1 + 0.001 Tnet]
Wet loss = K3(1+0.001xTnet)
Where K3 = [(9 x %H
2
+ %H
2
O) / 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 losses + 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%
CO
2
% = [(20.9% - O
2
m%) x K2% / 20.9%]
Unburned fuel Loss = K4 x CO% / ( CO% + CO
2
% )
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.
Oxygen Reference CO(n) = CO x
(20.9 - O
2
r)
(20.9 - O
2
m)