Solid fuel refers to various types of solid material that are used as fuel to produce energy and provide heating, usually released through combustion.
Types of solid fuel
Wood
Coal
Oil shale
Tanbark
Straw
Charcoal
Coke
Briquettes
Coal:
Coal is classified into three major types; anthracite, bituminous, and lignite.However, there is no clear demarcation between them. Coal is further classified as semi-anthracite, semi-bituminous, and sub-bituminous. Anthracite is the oldest coal from a geological perspective. It is a hard coal composed mainly of carbon with little volatile content and practically no moisture.
Wood:
The woods are very easily available and most commonly used solid fuel. The woods are used as fuel from ancient time after the discovery of the fire. The 39 Types of fuels and their Characteristics wood is used in almost every village, town and cities in India. The wood is used for industrial purposes.
Calorific Value of wood
| Kinds of Wood | Lowest Calorific Value (cal/kg) | Highest Calorific Value (cal/kg) |
| Oak | 4729 | 4750 |
| Birch | 4695 | 4831 |
| Elm | 4674 | 4833 |
| Alder | 4745 | 4839 |
| Pine | 4818 | 5310 |
| Fir | 4887 | 4900 |
| Lrch | 4775 | 4840 |
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Chemistry 