Fuel and Combustion Formulas

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Fuel and Combustion Formulas

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Fuel and Combustion
S.DescriptionSymbolFormulaExample
No.
1Gross calorific valueGCV80.8 * C + 22.45 * S + 339.53 * H – 35.89 * OC70.86
kcal/kg-fuelS0.58
CCarbon content in fuel, wt%H3.87
SSulphur content in fuel, wt%O6.08
HHydrogen content in fuel, wt%GCV6834
NNitrogen content in fuel, wt%Target
2Net calorific valueNCVGCV – 52.53 * H – 6 * mGCV6007
kcal/kg-fuelH3.2
GCVGross calorific value of fuel, kcal/kg-fuelm1.3
HHydrogen content in fuel, wt%NCV5831
mMoisture content in fuel, wt%Target
3Useful heat valueUHV8900 – 138 * ( Ash + m )Ash14.99
kcal/kg-fuelAshAsh content in fuel, wt%m1.93
mMoisture content in fuel, wt%UHV6565
Target
4Standard coal factorSCF( 1 – m / 100 ) * NCV / 7000m1.93
mMoisture content in fuel, wt%NCV6500
NCVNet calorific value of fuel, kcal/kg-fuelSCF0.911
Target
5Stoichiometric CombustionSCAFormula-1NCV6500
Airkg/sNCV * FF11000
or709 * 3600SCA28.01
Minimum CombustionNCVNet calorific value of fuel, kcal/kg-fuelTarget
AirFFuel rate in kiln, kg/hr
Formula-2C70.78
[ 0.11594 * C + 0.34783 * ( H – O / 8 ) + 0.04348 * S ] * FH3.46
3600O5.12
CWeight% of Carbon in fuelS0.71
HWeight% of Hydrogen in fuelF11000
OWeight% of Oxygen in fuelSCA28.17
SWeight% of Sulphur in fuelTarget
FFuel rate in kiln, kg/hr
Formula-3m1.9
10.478 * ( 100 – m ) * GCV * FGCV6700
100 * 7000 * 3600F10500
mWeight% of Moisture in fuelSCA28.70
GCVGross calorific value of fuel, kcal/kg-fuelTarget
FFuel rate in kiln, kg/hr
6Specific StoichiometricSSCAFormula-1NCV6500
Combustion Airkg/kg-fuelNCVSSCA9.17
or709Target
Specific MinimumNCVNet calorific value of fuel, kcal/kg-fuel
Combustion Air
Formula-2C70.78
0.11594 * C + 0.34783 * ( H – O / 8 ) + 0.04348 * SH3.46
CWeight% of Carbon in fuelO5.12
HWeight% of Hydrogen in fuelS0.71
OWeight% of Oxygen in fuelSSCA9.22
SWeight% of Sulphur in fuelTarget
Formula-3m1.9
10.478 * ( 100 – m ) * GCVGCV6700
100 * 7000SSCA9.84
mWeight% of Moisture in fuelTarget
GCVGross calorific value of fuel, kcal/kg-fuel
Formula-4SCF0.925
10.478 * SCFSSCA9.69
SCFStandard coal factor, –Target
7Theoretical Flame TemperatureTFT3.107 * NCVNCV6500
deg.CSCASSCA9.28
NCVNet calorific value of fuel, kcal/kg-fuelTFT2176
SSCASpecific stoichiometric combustion air, kg/kg-fuelTarget
8True CO2 in kiln exit gasTCO2100 * ( CO2 + CO )CO236.5
vol%100 + ( 1.89 * CO ) – ( 4.78 * O2 )CO0.002
CO2Kiln exit gas CO2, vol%O24.2
CO2Kiln exit gas CO, vol%TCO245.7
O2Kiln exit gas O2, vol%Target
9Burner Tip VelocityBTV4 * Ps 0.5Ps1800
m/sPsStatic pressure in duct, mmWGBTV170
Target
10%Primary Air%PAPA * 100PA2.05
%SCASCA27.24
PAPrimary air, kg/s%PA7.53
SCAStoichiometric combustion air, kg/sTarget
11Flame MomentumFM%PA * BTV%PA11.2
or%.m/s%PA%Primary air, %BTV150
Relative ImpulseBTVBurner tip velocity, m/sFM1680
(Source : F.L. Smidth)Target1000-2000

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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