In coal grindings, the coals grinded in the roller and its segments are accelerated as the air coming from the primary air ducts passes through the nozzles and transfers the coal in the grinding area to the boiler. The tiny coal particle enough to be dragged by the air is transferred to the boiler whereas the heavy one is transferred to the grinding part. This cycle goes on according to the air quantity and particle size. However, it is not always easy to obtain the air-feul mixture and the required particle size.

By means of the special nozzle and guiding designs, the desired coal particle is transferred to the boiler by performing this cycle in grinding part with a stable air.

The followings are our goals:

• Increasing the grinding time of the coal and the staying time in the boiler
• A better grinding and primary air flow control and decreasing the coal rejects
• A better or finer coal particle size
• Enhancement of air-fuel ratio
• Decreasing of the free oxygen in the flame nucleus at high temperature
• Decreasing of the NOX value and the excess rich oxygen forming in the flame nucleus as a result of high velocity increase of the extreme primary air sent to the burners in the burner nozzles
• Decreasing of the vibration during grinding and knocking
• Deflector, preventing of coal leakage and the conservation of the coal in the grinding part with a particular rotating speed in order to carry the coal particles