How to Classified Fuels?

Classification of Fuels:
There are many different ways to classify fuels.

On the Basis of their uses fuels can be classified as:
1) Renewable fuels:
Like renewable resources, renewable fuels can be used over a long period of time as they never get depleted. For example fuels obtained from animal waste as well as agricultural wastes.
2) Non-renewable fuels:
Similar to non renewable resources, these fuels are available in limited quantities and hence should be used wisely. They can get exhausted if not used judiciously. Fuels such as CNG, petrol and coal are some examples of these fuels.

On the basis of physical states, fuels are classified as:
1) Solid fuels:
They are bulky and need large storage space. On combustion, they leave behind ash or residue. For examples wood and coal.
2) Liquid fuels:
These exist in liquid state at room temperature. On combustion they do not leave behind any residue. For example, kerosene, petrol and diesel.
3) Gaseous fuels:
These exist naturally in gaseous form at room temperature. For example CNG and hydrogen.

On the basis of the source, they are classified as:
1) Primary fuels:
These fuels occur in the same form as they occur in nature. Some examples are fuels from animal and agricultural wastes, wood, coal etc. Secondary fuels: These fuels are obtained from natural fuels by various physical and chemical processes. Examples include water gas and producer gas from coke, coal gas from coal etc.
2) Secondary fuels:
These fuels are obtained from natural fuels by various physical and chemical processes. Examples include water gas and producer gas from coke, coal gas from coal etc.

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