The graph below illustrates a typical relationship between flyash LOI and coal fineness on a tangentially fired boiler firing Eastern Bituminous coal. Change in flyash LOI is less dramatic on Western coals due to the coal's reactivity and ash content but this relationship still holds true.
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Higher fineness levels always promote more even distribution of fuel between a pulverizer's separate burner lines. Better distribution promotes better combustion, inherently lower NOx emissions and lower flyash or carbon content. The graph below illustrates actual test data on a pulverizer with varied fineness.
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