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.
Specific wear rate consumption, gt checked during maintenance of mills.
Note Proximate and ultimate analysis are generally provided by coal supplier. However, Proximate analysis, Determination of calorific value, Ash analysis, Hardgrove analysis and Abrasion analysis are done as and when required in plant laboratory or by a third party agency.
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I1 Definition of degree of hydration of pure portland cement paste Degree of hydration is defined as the fraction of cement that has fully reacted with water relative to the total amount of cement in the sample. In the total cement content is not included the part of cement that was pre-hydrated when the cement paste was mixed.
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