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The grinding elements coupled with proper alignment and compression are critical to coal pulverisation in the lower mill body (grinding zone) while the classification of the pulverised coal, discharge and recirculation, is critical in the upper mill body (classification zone).
Coal grinding operation is monitored for following parameters to ensure objectivity and economy of operation. Product fineness (Residues) on 90micron and 200micron sieves. Feed moisture, % and Product moisture, % Production rate, tonnes/hour Specific power consumption (SPC) kWh/tonne.
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Bituminous coal ignites easily and burns long with a relatively long flame. If improperly fired bituminous coal is characterized with excess smoke and soot. Anthracite coal is the last classification, the ultimate maturation. Anthracite coal is very hard and shiny.
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Also, the process shown in FIG. 3 may be arranged in a double way and in one process the coal rich in the vitrain and clarain components is subjected to a primary classification using a 7 mm mesh screen, for example, and the resultant overmesh fraction is subjected to soft grinding followed by a secondary classification using a 5 mm mesh screen and grinding.
Coal classification, any of various ways in which coal is grouped. Most classifications are based on the results of chemical analyses and physical tests, but some are more empirical in nature. Coal classifications are important because they provide valuable information to commercial users (, for power generation and coke manufacturing) and to researchers studying the origin of coal.
Types and classification of coal. As geological processes apply pressure to dead plant material, over time it is transformed into the following: Peat this is not yet coal. Lignite, or brown coal, the lowest rank of coal, used almost exclusively as fuel for electric power generation.
#0183;#32;1. Introduction. The classification performance of the air classifier in a vertical coal mill determines the size of pulverized coal particles. Thus, the classification performance will influence the ignition, burning, and burnout of the coal particle, and NO x formation in the furnace as well [,,, ].The first generation of the coal mill classifier used static guide vanes to produce a
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