7. Pulverising Mill
Each of the six units at Drax has ten pulverising fuel mills, each capable of pulverising 36 tonnes of coal per hour. Inside the mills, ten giant hollow steel balls, each 1.4 tonnes in weight and approximately 730 millimetres in diameter, crush the coal into a fine powder.
Pauline says...
Crushing the coal into a fine powder makes it easier to burn it more completely. When the hollow mill balls are new their wall thickness is between 127 and 135 millimetres. In 42 to 58 thousand hours we wear them down to around 45 millimetres in thickness.
