基于主成分分析的煤粉流动性实验研究

Experimental Study of the Flowability of Pulverized Coal Based on an Analysis of the Principal Components

本研究以不同粒径的煤粉为研究对象,通过采用休止角测定仪和Jenike剪切实验装置对休止角、压缩率、粘聚力和内摩擦角等表征煤粉流动性的一些参数进行了测量。煤粉粒径与其流动性之间的关系采用主成分分析方法评价,并与Jenike流动函数法进行比较。结果表明:用Jenike流动函数法表征煤粉流动性时,流动函数随着煤粉粒径的增大从6.22增大到12.65,流动性变好;采用主成分分析的方法对煤粉的流动性进行表征时,随着煤粉粒径的增大,煤样的主成分得分从1.83降低到-1.34,煤粉的流动性增强,该结果与Jenike流动函数法表征煤粉流动性的实验结果是一致的。

With pulverized coal in various particle diameters serving as the object of study,such parameters as the repose angle,compression rate,adhesion force and inner friction angle etc. to represent the flowability of pulverized coal were measured by using a repose angel metering device and a Jenike shear test device. The relationship between the particle diameter of pulverized coal and its flowability was evaluated by employing the principal component analytic method and compared with that obtained by adopting the Jenike flow function method. It has been found that when the Jenike flow function method is used to represent the flowability of pulverized coal,the value calculated by using the flow function will increase from 6. 22 to 12. 65 with an increase of the particle diameter of pulverized coal,thus the flowability will become better. When the principal component analytic method is used to represent the flowablity of pulverized coal,the score obtained by using the principal components of the coal sample will decrease from 1. 83to- 1. 34,therefore,the flowability of pulverized coal will improve. These results are identical to the test ones whenJenike flow function method is used to represent the flowability of pulverized coal.