干法选煤气体分布器流化特性的研究
Coal Engineering(2011)
Abstract
研究了5μm(A型)、10μm(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。
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Key words
gas distributor,pressure drop,dry coal preparation,high density gas-solid fluidized bed,minute bubble
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