干法选煤气体分布器流化特性的研究

 研究了5 μm(A型)、10 μm(B型)两种孔径的气体分布器分别在不加滤布、一层滤布、二层滤布三种条件下的流化特性。结果表明，采用A型气体分布器时，产生的气泡小且多，在添加一层或两层滤布时床层波动相对比较平缓，在流化床内各点所测床层密度稳定；采用B型气体分布器时，流化床内局部有大气泡破裂，床层波动剧烈，仅在加两层滤布时，床层波动才渐趋于稳定。综合考虑流化效果及功耗，采用5μm孔径、一层滤布是进行实验室流化床特性试验的最佳条件。

Study on fluidized features of gas distributor applied to dry coal preparation

The fluidizing characteristics of two kinds of bore diameters Φ5μm(A)、Φ10μm(B) of gas distributors with none filter cloth, one filter cloth, and two filter cloths were researched. Experimental results show that using the kind of A gas distributor with the same number of filter cloths, the size of the bubbles produced is smaller and the bed density is well-distributed and stability with one filter cloth or two filter cloths, and that using the kind of B gas distributor, big bubbles burst and the bed rose and fell tempestuously and only with two filter cloths the bed waved gently. Considering fluidizing effect and power dissipation, the kind of A gas distributor with one filter cloth is the best condition of doing the fluidizing characteristics experiments.