Imbalance in coal flow due to various length of pipe and various number of bends that creates unequal resistance in pipeline.

Imbalance in coal flow causes an associated deterioration in combustion efficiency leading to increased unburnt carbon in flash that leads to increased coal consumption.

The only parameters that effects coal distribution but cannot be controlled by Variable Orifice valves is coal quality (coal hardness, coal particle size and coal moisture).

These orifice valves can be manipulated for coal flow adjustment while mill is in operation.