Abstract: Following the selection of internals for a 109mm diameter fluidized bed, four kinds of internals were evaluated for a 360mm diameter fluidized bed on the basis of the oxidation of o-xylene to phthalic anhydride. The yield of phthalic anhydride was chosen as the test index. The results obtained were essentially the same as those for the previous smaller bed, i.e.,the lower baffles were the best, the perforated plate slightly inferior, and the vertical tubes the least ideal. But, when vertical tubes were used in combination with horizontal plates, equivalent effects were noted with plate-type baffles having smaller spacings. Regression equations showed that fluidized beds equipped with vertical tubes were less sensitive to temperature and gas velocity, implying that the flow patterns were not the same as those for horizontal internals.

摘要： 在φ109mm流态化床里评选内部构件之后,在φ360mm流态化床里,通过邻二甲苯氧化制苯酐反应,以苯酐收率作为检验指标,对四种内部构件再次作了评选。获得的结果与以前是相同的,即斜片挡板效果最好,多孔板次之,垂直管束最不理想。但横向挡板与垂直管束联用时,效果与间隔小的横向挡板相当。回归方程指出,垂直管束构成的床层对温度和气速的敏感性较差,说明两者的气-固流动形态是不一样的。