The Research Of Gravity Separation Performance Evaluation Indicators

In the process of gravity separation of coal, The ideal separation process is higher than that of separation density material into high density by100%, while below the separation density of the material into the low density by100%, But in the process of the actual separation due to various factors such as level of equipment performance and operation of workers of a combination of reasons, Separation process of gravity separation device does not reach the ideal separation process, So we need to assess the separation effect of gravity separation equipment, to judge the re-election equipment excellent performance。To evaluation separation effect of the stand, commonly used evaluation index likely deviation value of Ep, imperfect I value, In the process of practical application of these indicators has some shortcomings, Ep values and I value reflect the distribution density curve separation between delta25and delta75, can not reflect the density is greater than the delta75and density is less than the delta25from the area, Using existing indexes of Ep value and I all can not fully reflect the efficiency of the separation process。Before use Ep value as the evaluation index, the original, groom’s proposed error area was used as evaluation index, The so-called error area is the area under the separation density delta p left half and right half the area of the curve of the upper, The smaller the size of this two pieces of said separation effect is better, The original error area, there are many problems in such as evaluation indexes:1. Sometimes not intersecting axes not closed on both ends of the distribution curve, not its size;2. Use inconvenient, it is more tedious to calculate error area; Based on the above shortcomings using less; This paper is to solve above two problems, Make the calculation of error area, Observation error when an area the size of the original evaluation indicators whether have good consistency, At the same time the error area of Ep and possible deviation value, imperfect degrees I value, efficiency and mismatch content of the total number of relations.