Fuels Definition: Afuelis any material that can be made to react with other substances so that it releases chemical energy or nuclear energy as heat or to be used for work (OR) It is any artificial or naturally occurring substance which after burning (reacting with oxygen) releases a large amount of energy which can be used for domestic & industrial processes Classification of Fuels: •Based on the State of Aggregation 1. Solid Fuel–All the fuels that exist in a solid-state are known as solid fuels. Example:Peat, Coal, Wood, Coke, Charcoal. 2.Liquid Fuel–All the fuels that exist in the liquid state are known as liquid fuels. Example: Diesel, Crude oil, Petrol. 3.Gaseous Fuel–All the fuels that exist in the gaseous state are known as gaseous fuels. Example: Natural gas, Biogas, Water gas. •Fuel Classification on the basis of Occurrence 1.Natural or Primary Fuels: Primary or natural fuels are obtained naturally and can be extracted, filtered, cleaned, or graded without any energy expenditure. Such fuels are processed and collected before converting into heat or mechanical work.
