Gas-solid fluidized bed separation is a highly efficient and clean technique for coal separation, and can effectively remove ash and sulfur contained gangue minerals from coal. However, the fine coal plugging distributor often leads to uneven fluidization and affects the separation effect. In this paper, different plugging ways were designed to study their effects on the fluidization characteristics and particle mixing. It was found that when the plugging phenomenon occurs, the minimum fluidization velocity of the fluidized bed gradually decreases as the plugging area enlarges. The difference between the top and the bottom of the bed minimum fluidization velocity increases accordingly, and a “stagnation phenomenon” occurs in the bed. The standard deviation of pressure fluctuations at the top of the bed is smaller than that at the bottom of the bed, which is the opposite of normal conditions. As the area of the plugging increases, the dead zone on the side wall of the fluidized bed significantly increases. The size of the dead zone is rapid reducing at the initial stage. It was noticed that the stratification of the low-density products is particularly affected by plugging, whereas the stratification of high-density products is not obviously influenced by certain conditions.

气固流化床分离是一种高效，清洁的煤分离技术，可以有效去除煤中的灰分和含硫的脉石矿物。然而，细煤塞分配器经常导致不均匀的流化并影响分离效果。在本文中，设计了不同的堵塞方式来研究其对流化特性和颗粒混合的影响。发现当发生堵塞现象时，随着堵塞面积的增大，流化床的最小流化速度逐渐降低。床的顶部和底部之间的差最小流化速度相应地增加，并且在床中发生“停滞现象”。床顶部压力波动的标准偏差小于床底部压力波动的标准偏差，这与正常情况相反。随着堵塞面积的增加，流化床侧壁上的死区显着增加。死区的大小在初始阶段迅速减小。注意到低密度产物的分层特别受堵塞的影响，而高密度产物的分层不受某些条件的明显影响。