Pulverised Coal in Boiler

Pulverised Coal is coal which has been powdered to a fine size.  Coal is powdered or pulverised by passing into through a pulveriser.  A Pulveriser is a machine which consists of rollers which crush coal into a fine size. Today, almost all coal fired plants used Pulverised Coal. 

The Pulverised coal is mixed with hot air.  This air and coal mixture is fed to a burner in the furnace which ignites it.  Modern pulverisers can grind coal to a very fine size of the order of microns.  When the pulverised coal mixes with air, it flows almost like a fluid stream.  

Pulverised coal burns more efficiently as it has a higher surface area.  Sometimes, pulverised coal is mixed with other fuels such as biomass.