How chemical energy stored in coal can be harnessed
Coal is a great example of stored chemical energy.
The illustration below shows how chemical energy in coal is tapped to produce electricity
Coal stored in a reservoir is fed into a bunker (boiler). Here it is burned at extremely high temperatures.
Burning releases the chemical energy in the coal in the form of extreme heat (thermal energy).
The extreme heat produced by the burning coal is used to heat water in tanks to produce steam.
The steam is directed through special tubes connected to shafts. A shaft is like a machine with blades
that can turn like the blades of a fan.
The spinning shafts are connected to a generator which generates electricity from the process.