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Coal Fineness It is understood generally that the finer we grind the easy it is for burning However the fineness required will always be directed by where to fire and what type of coal it is and lastly the fineness will be dictated by the risk factor involved in finer grinding high volatile coals The recommended fineness for coal verses volatile matter percentage is depicted in graph beside.
As understood from the above graph the relationship between 90 micron and 200 micron residue is quite important as well So it is generally recommended to have 200 micron residue as low as possible because coarse particles delays ignition gives long flames in kiln coating amp ring issues CO formation at kiln inlet higher preheater exit temperatures EGT As a rule of thumb the residue on 90 micron sieve should not be less than half of the volatile content for safety purpose ie R90gt12 Volatile Content.
Coal Moisture The degree of drying and therefore the required mill outlet temperature from 65 80 0C will depend upon the type of coal ground Some residual moisture in fine coal is recommended Graph below to minimize the potential of spontaneous ignition of fine coal which will again vary for different coal types as below.
Lignite Coals 0 5 1 0 by mass Bituminous Coals 1 5 2 5 by mass Anthracite Coals amp Petcoke 0 5 1 0 by mass.
While considering the safe mill outlet temperature care should be taken to avoid the temperatures below dew point of mill outlet gases so that the condensation inside the bag filter and consequent material jamming problems can be avoided.
Important Note If you chose to use different types of coal having different rank simultaneously or use coal and Petcoke remember to grind them separately as per above guidelines and feed them from different fine coal bins in required proportion to kiln and pre calciner as required.
Coal Grinding Operation Objectives and KPIsHighly energy intensive unit operation of coal grinding is intended to provide a fine coal as a fuel for calcination and clinkerization Coal grinding operation is monitored for following parameters to ensure objectivity and economy of operation.
Product fineness Residues on 90 micron and 200 micron sieves Feed moisture and Product moisture Production rate tonneshourSpecific power consumption SPC kWhtonne.
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