Fly ash in flue gas not only crusts on the surface, stopping the dissolving of limestone, but also affects the dust dischargeindex, reducing the quality of gypsum.
烟气中的飞灰既在液相膜表面结壳，阻碍石灰石的溶解，又影响脱硫系统含尘量排放指标，降低石膏品质。
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This paper introduces the basic idea, formulae and cases of application of the index smoothing method. It discusses several problems of its application in the mine groundwater discharge forecast.