Thermal+Energy - FUELS Fuel A fuel is defined as naturally...

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FUELS Fuel : A fuel is defined as naturally occurring or artificially manufactured combustible carbonaceous material which serves particularly as source of heat and light and also in few cases as a source of raw material. Classification of fuels Fuels are classified into a two types. 1) Based on their origin they are classified into a) Primary fuels b) Secondary fuels. a) Primary Fuels: There are naturally occurring fuels which serves as source of energy without any chemical processing. Ex: Wood, Coal, Crude oil, Natural gas, Peat, Lignite, Anthracite.. b) Secondary Fuels: - They are derived from primary fuels & serves as source of energy only after subjecting to chemical processing. Ex: Charcoal, Coke, produsergas, Petrol, Diesel etc., 2) Bases on their physical state fuel are classified into a) Solid b) Liquid c) Gaseous fuels. SOLID LIQUID GASEOUS Primary Fuels Wood, Coal, Crude oil Natural gas. Peat, Anthracite Petrol, Gasoline, LPG, Secondary Fuels Coke, Charcoal produsergas, Diesel Coal gas. Calorific Value. Calorific value is defined as the amount of heat liberated when a uknit mass of fuel lis burnt completely in the presence of air or oxygen Calorific value is of two types as follows:- 1) Higher calorific value. (HCV) or Gross calorific value. (GCV) 2) Lower calorific value. (LCV) or Net calorific value. (NCV)
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1) HCV: - It is the amount of heat liberated when a unit mass of fuels burnt completely in the presence of air or oxygen and the products of combustion are cooled to room temperature. Here it includes the heat liberated during combustion and the latent heat of steam. Hence its value is always higher than lower calorific value. 2) LCV: - It is amount of heat liberated when a unit mass of fuel is burnt completely in the presence of air or oxygen and the product of combustion are let off completely into air. It does not include the latent heat of steam. Therefore it is
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  • Fall '16
  • Coal, Methane, Gasoline, calorific value

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