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analysis of coal mill fineness

For complete combustioncoalshould havefinenessof 75% through 200 mesh and 99.5% through 50 mesh.Primary air +coalmixture flowing through eachcoalpipes should have minimum velocity of 18 m/sec, Temp. around 80 degrees C , and air/coalratio of 1.8 -2. 1 .1Reduction incoalretention time incoal millfor fine grinding. 2.Increase in

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