How to take Mill

Starting a Mill:

• Check if there is any Permissive red in colour, take action accordingly
• Give ON command to Mill
• Open the CAG
• Open the Feeder Outlet gate
• Open the HAG
• Now maintain air flow of 75 ton with temperature mill outlet around 70-80 deg by regulating HAD and CAD
• Give ON command to Feeder
• Now put CAD with temperature set point in Auto
• Put HAD in Auto and after maintain feed rate around 35-40 toh put Feeder in Auto too
• Before taking mill ensure opening of reject of mill at start
• Send operator to ensure their is no abnormal sound, Lube oil leakage or any PF leakage
• Observe Vibration and Mill bearing metal temperature if their is any abnormality , take immediate steps.

Stopping Mill:

• Take Feed rate in Manual mode
• Reduce feeding rate to 20 TPH and maintain outlet temperature by changing CAD set point
• If you want to empty Feeder, send Operator to close Feeder inlet chain gate and let Feeder and Mill running till the left over coal is milled and feed to furnace
• Then trip the Feeder, Let mill run till it is empty by ensuring mill motor current is equal to No load current
• After mill is empty, air to be cut by closing CAD and CAG
• Stop Mill
• Maintain the mill inlet temperature within 100 deg, by allowing cold air to flow in it