Online monitoring of coal particle size and flow,
The fineness of the coal powder, as well as the uniformity of the coal flow sent to each burner fed by the same mill, are crucial parameters to achieve an effective combustion . The finer the particles, the better the mixing between the fuel and the combustion air, which ensures a complete combustion (low Loss of Ignition, LOI), low CO emissions and a more effective control of NO X emissions  ,  ,  .Anthracite and Bituminous Coal - Thomas Feed Mill,As much as coal furnaces vary, so do the sizes and type of coal they require to operate efficiently. The coal yards at Thomas Mills and Windber Agway are stocked with the sizes of Anthracite and Bituminous coal you need to keep warm this winter.COAL MILLS FOR THERMAL STATIONS - blogspot,These balls reduce in size as the mills operate and so the highest size ball is normally used for recharging. In earlier days, most of the ball mills had a single inlet and outlet, but now designers use both ends to feed coal and also for taking out pulverized coal.