The air distributor is an important part of the gas–solid separation fluidized bed, which directly determines the air distribution across the bed base. In this study, numerical simulation and experimental analysis are used together to study the influence of a two-size-orifice distributor on the fluidization quality and separation performance of the fluidized bed. Results show that the bed is prone to channeling when the air distributor contains 6 mm orifices, and the values of fluidization parameters of the bed, i.e., pressure drop, voidage, and density stability, increase with decreasing orifice size. Owing to the redistribution of airflow caused by large orifices in the center, followed by the elimination of sidewall effects, the two-size-orifice distributor with 4 mm inner orifices and 2 mm outer orifices can improve the fluidization quality compared with other distributors and further promote the density segregation process of coal particles in the bed (ash separation degree S_ash = 21.62%). Finally, the coal particles are separated in a fluidized bed with the abovementioned two-size-orifice distributor. The yield of clean coal products is 54.83% with an ash content of 20.96%, while the yield of gangue is 45.17% with an ash content of 30.77%. Moreover, the possible error is as low as 0.10 g/cm³, indicating the good separation effect of the gas–solid separation fluidized bed with the two-size-orifice distributor.

空气分配器是气固分离流化床的重要组成部分，它直接确定整个床底座的空气分布。在这项研究中，数值模拟和实验分析一起用于研究两孔口分配器对流化质量和流化床分离性能的影响。结果表明，当空气分配器包含6  mm的孔口时，床层很容易窜动，并且床的流化参数值（即压降，空隙率和密度稳定性）随孔口尺寸的减小而增加。由于中央大孔口引起的气流的重新分配，然后消除了侧壁效应，因此采用了两个孔口的分配器， 内部孔口为4毫米，内部为2个 与其他分配器相比，mm的外孔可提高流化质量，并进一步促进床中煤颗粒的密度分离过程（灰分分离度S _ash  =  21.62％）。最后，用上述两孔分配器在流化床中分离煤颗粒。清洁煤产品的产率为54.83％，灰分为20.96％，而煤ue石的产率为45.17％，灰分为30.77％。此外，可能的误差低至0.10  g / cm ³，这表明带有双孔分配器的气固分离流化床的良好分离效果。