For calculation of GCV of fuel, we need to do an analysis of fuel and get the constituent of fuel on a weight basis. Based on the enthalpy of formation we can estimate the calorific value of the fuel. C+ O2 —- CO2 + 8137.5Kcal/kg of carbon. H2 + ½ O22—-H20 + 28905 Kcal/Kg of hydrogen. S +O2—SO2+ 2181 Kcal/kg of Sulphur.
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Therefore, the actual GCV received & fired in boiler (GCV ARB) is different than the equilibrated GCV (GCV EM) determined at the loading point. Hence, the GCV of coal may be considered after allowing an adjustment for total moisture as per the formula given as under: GCV ARB = [GCV EM X (100 - TM)] / (100 - EM) Where: GCV ARB
kcal/kg: Net CV = Gross CV - 50.6H - 5.85M - 0.191O. MJ/kg: Net CV = Gross CV - 0.212H - 0.0245M - 0.0008O. Btu/lb: Net CV = Gross CV - 91.2H - 10.5M - 0.34O. – where M is % Moisture, H is % Hydrogen, O is % Oxygen (from ultimate analysis*, also As Received). *Ultimate analysis determines the amount of carbon, hydrogen, oxygen, nitrogen ...
The TM usually does not have a big influence and therefore, the GCV arb has few questions associated with it. However, the GCV adb takes the Analysis Moisture into account which actually depends on the lab conditions (temperature, humidity, air pressure, etc.) which may differ substantially. Therefore, the GCV adb is not a very reliable result ...
PCV ADB = Gross Calorific Value at Equilibrated Condition 60% RH and 40° C), TM=Total moisture, M eq =Equilibrated Moisture at 60% RH and 40° C ii (b): Till CERC specifies any norm, a margin of 85-100 IkCal/kg in GCV for pit head station and a margin of 105-120 ~Cal/kg in GCV for non-pit head station may be allowed. In