炼焦煤调湿流化床料层流化特性实验研究

Study on fluidization for coal moisture control in fluidized bed

为研究流化床煤调湿流化机理,优化工艺参数,改进和开发流化床煤调湿装置,采用有机玻璃制成流化床冷态实验台对颗粒料层流化特性进行研究,对生产实际用煤的4种不同粒径范围的颗粒分别用3种初始料层高度进行分组实验研究。给出不同实验条件下的流化速度、床层高度、颗粒平均粒径、压降等参数的流化特性曲线,得出各条件下的临界流化速度,并分析影响临界流化速度的主要因素及其相互关系。通过线性回归得到临界流化速度与颗粒平均粒径平方根呈线性关系的预测公式,并根据量纲分析法给出应用条件更广的准数方程。研究结果表明:由线性回归所得预测公式与系数显著性好,有较高的可靠性;得到临界流化速度与阿基米德准数0.25次方呈线性关系的预测公式,这可对设计和操作煤调湿装置提供较可靠的参考依据。

To study the fluidization principle of fluidized bed for coal moisture control, improve and develop the fluidized bed equipment, the experimental equipment was established. The coal particles fluidization in a fluidized bed with different sizes and different bed heights were experimentally studied. Fluidization curves of the fluidizing velocity and the average particle diameter and the resistance to pressure on the bed and the bed height of the impact were obtained. The critical fluidizing velocity was given. The relationship between the critical fluidizing velocity and particle diameter was obtained. The results show that the predicted critical fluidizing velocity is in good agreement with the measured result. Critical fluidizing velocity has relationship of square root of particle diameter. The relationship between the critical fluidizing velocity and the archimedes is established. It is useful for the design and operation of the coal moisture control equipment.