To deeply knowledge of the flow behaviors of pulverized coal particles in dense gas–solid two-phase flow, a multi-scale analysis method based on electrostatic sensor array is applied for the multi-scale characterization of flow behaviors of dense gas–solid flow. The experimental results indicate that: for steady flow, with the increment of conveying pressure difference, the individual particles increase and the particle clusters decrease, the individual particle distribution is always inhomogeneous but the particle cluster distribution tends to be more homogeneous over the cross-section of pipe, while the average flow behavior of pulverized coal particles is always in the relatively static state. For unsteady flow, the average flow behavior of pulverized coal particles is dynamic, and the flow behaviors of the multi-scale flow structures over the cross-section of pipe are all significantly inhomogeneous. Moreover, the effect of particle size on flow behavior of pulverized coal is also investigated and validated.

为深入了解煤粉颗粒在浓密气固两相流中的流动行为，采用基于静电传感器阵列的多尺度分析方法对浓密气固两相流的流动行为进行多尺度表征。实验结果表明：对于稳流，随着输送压差的增加，单个颗粒增加，颗粒团减少，单个颗粒分布总是不均匀的，但颗粒团在横截面上的分布趋于均匀。而煤粉颗粒的平均流动行为始终处于相对静止的状态。对于非定常流动，煤粉颗粒的平均流动行为是动态的，管截面上的多尺度流动结构的流动行为均显着不均匀。此外，还研究并验证了粒度对煤粉流动行为的影响。