Coal Fineness Target

Pulverize coal fineness 200 mesh should be more than 70% from a weight. The measurement could be done by taken coal fineness sample at pulverize outlet pipe.

1 kg of coal fineness sample at least 70% on 200 mesh (0.75Kg). It conditions of pulverize call in good performance.

Pulverize theory can be found on http://idpowerstation.blogspot.com/2009/09/pulverizer.html


Many factors could be influence to get coal fineness 200 mesh 70% like primary air flow, classifier speed, temperature etc. Picture below show that hydraulic roll wheel pressure very match correlation of coal mesh target.

High primary air flow may reduce coal fineness, contributing to increase unburned combustibles, flame instability and can lead hazardous situations.

With lower set of PA Flow has clear correlation trend line between coal fineness and hydraulic roll wheel pressure. Pulverize choke can earlier detected on fuel flow cross limit by air flow alarm.