摘要
对煤炭制样用旋转缩分机进行性能评价,即通过精密度核验和偏倚试验后可确保制样的精密度,并确认缩分后的留样能代表缩分前的试样特性。主要针对1种煤炭制样用旋转缩分机的性能评价方法进行探讨,从切割速度、切割子样数、开口尺寸等技术参数、缩分后试样质量均匀性、缩分精密度及缩分系统偏倚等方面评价旋转缩分机是否满足煤炭制样要求,缩分后的试样质量均匀性可通过计算缩分后各份试样质量的变异系数进行评价;缩分精密度、偏倚检验可分别核验缩分后留取单份样、2份样、4份样是否均符合国标要求,其中通过计算留样和弃样的加权平均值并将其作为参比值与留样进行比较,依据GB/T 19494.3且从离群值检验、试验对数检验、差值独立性检验、标准差计算及t检验等方面开展机械旋转缩分机的偏倚检验。试验结果表明,煤炭制样用旋转缩分机的技术参数、缩分后试样质量均匀性和精密度符合国标要求,偏倚在设定B值为0.15时可接受为无偏倚系统。
The performance evaluation of a rotary divider for coal sampling ensures the precision of sampling through precision verification and bias testing,and confirms that the retained sample after division can represent the characteristics of the sample before division.This article mainly discussed a performance evaluation method for a rotary divider for coal sampling,evaluating whether the rotary divider meets the requirements from the technical parameters such as cutting speed,number of cut subsamples,opening size,uniformity of sample quality after division,precision of division,and bias of the division system.The uniformity of sample quality after division was evaluated by calculating the coefficient of variation of the mass of each sample after division.The accuracy and bias of the reduction were verified by checking whether the single,two,and four samples retained after reduction met the requirements of the national standard.The bias was calculated by calculating the weighted average of the retained and discarded samples as a reference value and comparing it with the retained samples.According to GB/T 19494.3,the bias test of the mechanical rotary reduction machine was conducted from the aspects of outlier testing,logarithmic testing,difference independence testing,standard deviation calculation and t-test.The experimental results show that the technical parameters,sample quality uniformity,and accuracy of the mechanical rotary reduction machine after reduction could meet the requirements of the national standard.The bias is acceptable as a non-biased system when the B value was set to 0.15.
作者
初奎明
王建
沈玉双
吴碧海
CHU Kuiming;WANG Jian;SHEN Yushuang;WU Bihai(Zhejiang Yuehua Energy Test Corporation Ltd.,Ningbo 315211,China)
出处
《煤质技术》
2023年第6期80-86,共7页
Coal Quality Technology
基金
浙江省能源集团有限公司科技资助项目(ZNKJ-2018-064)。
关键词
旋转缩分机
性能评价
精密度核验
偏倚试验
T检验
标准差
变异系数
参比值
rotary reduction machine
performance evaluation
precision verification
bias test
t-test
standard deviation
coefficient of variation
reference value
