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三十年来,一直广泛采用下述公式来计算分级机的校正效率:E_c=(Ea-Rf)/(100-Rf)×100,式中,E_a 为实际效率,R_f 为进入粗粒产品的液体(一般为水)重量百分数。当采用上述公式时,在很多情况下,细粒级的 E_c 值为负值。本文在试验的基础上提出了更为适用的公式,其形式为:E_c=(Ea-Fz)/(100-Fz)×100,式中 F_z 为分级机粗粒产品中最细级别的百分含量。实践表明,新公式避免了 E_c 值为负的不合理现象,计算结果更为精确。
For thirty years, the following formula has been widely used to calculate the calibration efficiency of the classifier: E_c = (Ea-Rf) / (100-Rf) × 100, where E_a is the actual efficiency and R_f is the liquid entering the coarse product (Usually water) weight percentage. When using the above formula, in many cases the fine-grained E_c value is negative. Based on the experiment, a more suitable formula is proposed in the paper, which is in the form of E_c = (Ea-Fz) / (100-Fz) × 100, where F_z is the finest percentage content. Practice shows that the new formula avoids the unreasonable phenomenon that E_c is negative, and the calculation result is more accurate.