Citation

Liu Q, Liu Y, Du K, Zheng S, Zhu Z. China Saf. Sci. J. 2022; 32(2): 130-138.

Copyright

(Copyright © 2022, China Occupational Safety and Health Association, Publisher Gai Xue bao)

DOI

10.16265/j.cnki.issn1003-3033.2022.02.018

PMID

unavailable

Abstract

In order to investigate influence of mean particle sizes on the calculation of coal's physical property parameters, screening phenomenon and particle size distribution of coal particles at five fractions were studied. Then, with solution of coal gas diffusion coefficient as an example, effects of arithmetic mean and volume-weighted mean volume particle size on calculation results were analyzed. The results show that special separation phenomenon occurs during screening process of coal particles, and distribution of target fractions only accounts for 33. 37%--49. 32% of real size distribution. And arithmetic mean makes all sieved particle sizes within the target fraction, which causes a large error in calculating the diffusion coefficient. Compared it with the volume-weighted average volume size which considers characteristics of particle size distribution, the difference of diffusion coefficient between the two solutions is up to 43. 42%. © 2022, Editorial Department of China Safety Science Journal. All rights reserved.

Language: zh