复合双分布器气－固流化床中气体混合行为的研究

Investigation on the Behavior of Gas Mixing in Gas-Solid Fluidized Bed with Composite Distribntor

采用稳态气体示踪方法考察了气－固流化床中，上、下分布器体系对床内气体混合的影响。试验结果表明，流化床层在双分布器作用下，气体混合特性能较好地遵守气体扩散定律，并可用拟均相二维扩散模型进行描述，其轴、径向气体扩散系数与末中气速成正比。此外，本文还对上分布器的喷嘴形式对气体混合的影响，稳态示踪气体浓度的波动行为等进行了考察。

Gas mixing in a gas-solid fluidized bed with one up and one down distributors bas beenstudied based on steadv-state tracer method.It is shown that radial tracer concentrationcan be more uniform for low flow rate in the downward distributor and for high fioW ratein the upward distributor.The gas mixing in the fluidized bed can be described by a plug-flow two-dimensionalpseudo-dispersion model.The radial and axial gas dispersion coefficients are found to belinearly increasing with gas floW rate. Correlations of both dispersion coefficients have beenobtained.