DO WE HAVE MORE KCAL/KG CLINKER IF WE TOOK THE BASE AS GCV OF COAL & LESS WITH NCV OF COAL ? IF YES , WHY ? ALSO IN CASE OF GCV THE COAL CONSUMPTION WILL REDUCE OR WILL REMAIN THE SAME ?
BLM
Dear sir here under iam giving the deffinition of the GCV & NCV, if you go through you can understand. K.Cal/kg clinker should be calculate always by considereing the NCV only.
GCV [Gross Calorific Value]
Amount of heat evolved by complete combustion of unit mass when the products of combustion are cooled down to the initial atmospheric temp. i.e. 15 deg.C
On burning a fuel, hydrogen present in it combines with oxygen and steam is formed. this steam carries certain heat besides the dry hot flue gases. On cooling the products of combustion steam is condensed to water at room temp. usually taken as 15 deg.C thus heat recovered from the flue gases and steam per unit mass is GCV.
NCV [Net Calorifc Value]
Amount of heat evolved by the complete combustion of unit mass when the products of combustion are cooled to 100 deg. C without condensation of steam.
When the heat obsorbed or carried away by the products of combustion is not recovered and the steam formed is not condensed. Then the amount of heat obtained per unit mass is known as NCV.
B.L.Murthy