Fuel and Combustion Formulas

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Fuel and Combustion Formulas

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Fuel and Combustion
S. Description Symbol Formula Example
No.
1 Gross calorific value GCV 80.8 * C + 22.45 * S + 339.53 * H – 35.89 * O C 70.86
kcal/kg-fuel S 0.58
C Carbon content in fuel, wt% H 3.87
S Sulphur content in fuel, wt% O 6.08
H Hydrogen content in fuel, wt% GCV 6834
N Nitrogen content in fuel, wt% Target
2 Net calorific value NCV GCV – 52.53 * H – 6 * m GCV 6007
kcal/kg-fuel H 3.2
GCV Gross calorific value of fuel, kcal/kg-fuel m 1.3
H Hydrogen content in fuel, wt% NCV 5831
m Moisture content in fuel, wt% Target
3 Useful heat value UHV 8900 – 138 * ( Ash + m ) Ash 14.99
kcal/kg-fuel Ash Ash content in fuel, wt% m 1.93
m Moisture content in fuel, wt% UHV 6565
Target
4 Standard coal factor SCF ( 1 – m / 100 ) * NCV / 7000 m 1.93
m Moisture content in fuel, wt% NCV 6500
NCV Net calorific value of fuel, kcal/kg-fuel SCF 0.911
Target
5 Stoichiometric Combustion SCA Formula-1 NCV 6500
Air kg/s NCV * F F 11000
or 709 * 3600 SCA 28.01
Minimum Combustion NCV Net calorific value of fuel, kcal/kg-fuel Target
Air F Fuel rate in kiln, kg/hr
Formula-2 C 70.78
[ 0.11594 * C + 0.34783 * ( H – O / 8 ) + 0.04348 * S ] * F H 3.46
3600 O 5.12
C Weight% of Carbon in fuel S 0.71
H Weight% of Hydrogen in fuel F 11000
O Weight% of Oxygen in fuel SCA 28.17
S Weight% of Sulphur in fuel Target
F Fuel rate in kiln, kg/hr
Formula-3 m 1.9
10.478 * ( 100 – m ) * GCV * F GCV 6700
100 * 7000 * 3600 F 10500
m Weight% of Moisture in fuel SCA 28.70
GCV Gross calorific value of fuel, kcal/kg-fuel Target
F Fuel rate in kiln, kg/hr
6 Specific Stoichiometric SSCA Formula-1 NCV 6500
Combustion Air kg/kg-fuel NCV SSCA 9.17
or 709 Target
Specific Minimum NCV Net calorific value of fuel, kcal/kg-fuel
Combustion Air
Formula-2 C 70.78
0.11594 * C + 0.34783 * ( H – O / 8 ) + 0.04348 * S H 3.46
C Weight% of Carbon in fuel O 5.12
H Weight% of Hydrogen in fuel S 0.71
O Weight% of Oxygen in fuel SSCA 9.22
S Weight% of Sulphur in fuel Target
Formula-3 m 1.9
10.478 * ( 100 – m ) * GCV GCV 6700
100 * 7000 SSCA 9.84
m Weight% of Moisture in fuel Target
GCV Gross calorific value of fuel, kcal/kg-fuel
Formula-4 SCF 0.925
10.478 * SCF SSCA 9.69
SCF Standard coal factor, – Target
7 Theoretical Flame Temperature TFT 3.107 * NCV NCV 6500
deg.C SCA SSCA 9.28
NCV Net calorific value of fuel, kcal/kg-fuel TFT 2176
SSCA Specific stoichiometric combustion air, kg/kg-fuel Target
8 True CO2 in kiln exit gas TCO2 100 * ( CO2 + CO ) CO2 36.5
vol% 100 + ( 1.89 * CO ) – ( 4.78 * O2 ) CO 0.002
CO2 Kiln exit gas CO2, vol% O2 4.2
CO2 Kiln exit gas CO, vol% TCO2 45.7
O2 Kiln exit gas O2, vol% Target
9 Burner Tip Velocity BTV 4 * Ps 0.5 Ps 1800
m/s Ps Static pressure in duct, mmWG BTV 170
Target
10 %Primary Air %PA PA * 100 PA 2.05
% SCA SCA 27.24
PA Primary air, kg/s %PA 7.53
SCA Stoichiometric combustion air, kg/s Target
11 Flame Momentum FM %PA * BTV %PA 11.2
or %.m/s %PA %Primary air, % BTV 150
Relative Impulse BTV Burner tip velocity, m/s FM 1680
(Source : F.L. Smidth) Target 1000-2000

IF YOU WORK IN A CEMENT PLANT AND YOU NEED COURSES AND MANUALS LIKE THIS MANUAL AND BOOKS AND EXCEL SHEETS AND NOTES I SPENT 23 YEARS COLLECTING THEM YOU SHOULD CLICK HERE TO DOWNLOAD THEM NOW 

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