关键词: 煤粉, 流动性, 粒径, Jenike法

Abstract: The flowability of Yangchangwan, Beisu, and Tianba coal powders with different particle sizes were investigated using five methods including Angle of repose, Hausner ratio, Carr flow index, Jenike theory and mass flow rate. The methods were compared and analyzed systematically. Experimental results showed that, the flowability of the coal powders could be improved obviously by increasing the particle size, especially for those smaller than 75μm approximately. Flowability of the three coal powders in similar sizes could be distinguished by Angle of repose, Hausner ratio and Carr flow index, and Beisu Coal behaved the poorest flowability. The methods had a good agreement in describing the trend of flowability. However, at preconsolidation stress of 40kPa, the ffc was beyond the traditional relationship between it and the flowability.

Key words: coal powders, flowability, particle size, Jenike method