Abstract In this paper, the relationship between angle of repose, surface energy and bulk and shear properties of different particle size distribution lignite pulverized coal with different moisture content was experimentally investigated. The dry sample and wet sample were prepared under relative humidity 0% and 90%. The interactions between coal samples and polar or non-polar gaseous probes were investigated by the surface energy test with an inverse gas chromatography (IGC) technique. The compressibility test and shear test were taken by the FT4 Powder Rheometer. The changes in bulk and flow properties of different particle size distribution samples were collected as a function of water content. The results show that water content plays a significant role on the packing and flow behaviors and surface energy of the dry and wet different particle size lignite pulverized coal. The IGC tests results showed that for the relative humidity 90% samples, the water was the interior water, which played a role of improving the flowability. In the end, a model was proposed to study the relationship between angle of repose and surface energy and flowability. The model could easily predict the relationship between angle of repose with wet and dry particles. This research will provide a better understanding on how water content affects surface characteristic and the flow properties of lignite particles and will benefit to optimize the relevant unit operations.

中文翻译：

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加水对褐煤表面能、体积和流动特性的影响

摘要 本文通过实验研究了不同含水率的不同粒度分布褐煤粉的休止角、表面能与体积和剪切特性之间的关系。干样品和湿样品在相对湿度0%和90%下制备。煤样品与极性或非极性气体探针之间的相互作用通过表面能测试与逆气相色谱 (IGC) 技术进行了研究。压缩性试验和剪切试验采用 FT4 粉末流变仪进行。收集不同粒度分布样品的体积和流动特性的变化作为水含量的函数。结果表明，含水量对干湿不同粒径褐煤粉的堆积、流动行为和表面能有显着影响。IGC测试结果表明，对于相对湿度为90%的样品，水为内部水，起到了提高流动性的作用。最后，提出了一个模型来研究休止角与表面能和流动性之间的关系。该模型可以轻松预测休止角与干湿颗粒之间的关系。这项研究将更好地了解含水量如何影响褐煤颗粒的表面特性和流动特性，并将有利于优化相关单元操作。IGC测试结果表明，对于相对湿度为90%的样品，水为内部水，起到了提高流动性的作用。最后，提出了一个模型来研究休止角与表面能和流动性之间的关系。该模型可以轻松预测休止角与干湿颗粒之间的关系。这项研究将更好地了解含水量如何影响褐煤颗粒的表面特性和流动特性，并将有利于优化相关单元操作。IGC测试结果表明，对于相对湿度为90%的样品，水为内部水，起到了提高流动性的作用。最后，提出了一个模型来研究休止角与表面能和流动性之间的关系。该模型可以轻松预测休止角与干湿颗粒之间的关系。这项研究将更好地了解含水量如何影响褐煤颗粒的表面特性和流动特性，并将有利于优化相关单元操作。该模型可以轻松预测休止角与干湿颗粒之间的关系。这项研究将更好地了解含水量如何影响褐煤颗粒的表面特性和流动特性，并将有利于优化相关单元操作。该模型可以轻松预测休止角与干湿颗粒之间的关系。这项研究将更好地了解含水量如何影响褐煤颗粒的表面特性和流动特性，并将有利于优化相关单元操作。