This paper analyzes the influence of different coal mass fraction in an air dense medium fluidized bed (ADMFB). The effect of the low density particles layer on heavy sedimentation increased with increasing material layer thickness. The thickness of the low density particles layer also affected the final settling time of the high density particles. Increasing the thickness of the low density particles layer by Δh provoked an increase in the settling of high density particles that was related to their diameter (Δh/D). The pressure gradient across the bed was lower than that observed for the control experiment, which had only the dense material, owing to a decrease in the pressure gradient in Zones 1 and 5 (at the top and bottom of the bed, respectively). Introducing different coal sizes resulted in different fluidization environments, particle accumulation layers, and changes to the surrounding zone. However, the influence of the coal particles on the local bed characteristics was related to its concentration. The feeding mass fraction of 6–13 mm size and 13–25 mm size coal should be limited to10% and 13%, respectively. The ranges of possible deviation were found to be 0.08–0.15 and 0.07–0.10 for the respective samples.

本文分析了空气密度中等的流化床（ADMFB）中不同煤质量分数的影响。随着材料层厚度的增加，低密度颗粒层对重度沉积的影响增加。低密度颗粒层的厚度也影响高密度颗粒的最终沉降时间。增加由Δ低密度颗粒层的厚度ħ挑起增加高密度颗粒沉淀这是与它们的直径（Δ ħ / d）。由于在区域1和5（分别在床的顶部和底部）的压力梯度减小，整个床的压力梯度低于仅具有致密材料的对照实验所观察到的压力梯度。引入不同尺寸的煤会导致不同的流化环境，颗粒堆积层以及周围区域的变化。但是，煤颗粒对局部床层特征的影响与其浓度有关。6-13毫米大小和13-25毫米大小的煤的进料质量分数应分别限制为10％和13％。发现各个样本的可能偏差范围为0.08–0.15和0.07–0.10。