Results of experimental measurement of solids mass flux profiles in a high density circulating fluidized bed riser over a wide operating condition are described.The existence of three solids flux radial profile regime...Results of experimental measurement of solids mass flux profiles in a high density circulating fluidized bed riser over a wide operating condition are described.The existence of three solids flux radial profile regimes:core-annular,parabolic and U-shaped is found.A model for all the three regimes is proposed and correlations of model parameters are obtained.Comparison of predicted solids flux profiles with experimental data is very promising.The correlations for the boundaries of the three regimes and the radius of core for core-annular regime are obtained.展开更多
对25.0%±0.3%高水分稻谷进行流化床干燥,研究在不同干燥温度、降水幅度与缓苏时间下对稻谷爆腰增率的影响,并通过扫描电镜观察稻谷在不同条件下谷粒显微结构的变化情况。结果表明:干燥温度、降水幅度和缓苏时间及干燥温度与缓苏时...对25.0%±0.3%高水分稻谷进行流化床干燥,研究在不同干燥温度、降水幅度与缓苏时间下对稻谷爆腰增率的影响,并通过扫描电镜观察稻谷在不同条件下谷粒显微结构的变化情况。结果表明:干燥温度、降水幅度和缓苏时间及干燥温度与缓苏时间的交互作用对稻谷干燥后的爆腰增率影响极显著(p<0.01),影响顺序为:干燥温度>缓苏时间>降水幅度。65℃干燥温度,3.0%降水幅度,3 h缓苏时间条件下,稻谷内部淀粉粒排列结构疏松,横断面细胞间的淀粉粒间间隙大,局部裂纹数量多。稻谷在干燥温度45℃、缓苏时间3 h、降水幅度1.5%的条件下,稻谷爆腰增率1.0%,干燥速率1.32 g H_2O·min^-1,可在保障稻谷加工品质的同时提高稻谷干燥速率。展开更多
文摘Results of experimental measurement of solids mass flux profiles in a high density circulating fluidized bed riser over a wide operating condition are described.The existence of three solids flux radial profile regimes:core-annular,parabolic and U-shaped is found.A model for all the three regimes is proposed and correlations of model parameters are obtained.Comparison of predicted solids flux profiles with experimental data is very promising.The correlations for the boundaries of the three regimes and the radius of core for core-annular regime are obtained.
文摘对25.0%±0.3%高水分稻谷进行流化床干燥,研究在不同干燥温度、降水幅度与缓苏时间下对稻谷爆腰增率的影响,并通过扫描电镜观察稻谷在不同条件下谷粒显微结构的变化情况。结果表明:干燥温度、降水幅度和缓苏时间及干燥温度与缓苏时间的交互作用对稻谷干燥后的爆腰增率影响极显著(p<0.01),影响顺序为:干燥温度>缓苏时间>降水幅度。65℃干燥温度,3.0%降水幅度,3 h缓苏时间条件下,稻谷内部淀粉粒排列结构疏松,横断面细胞间的淀粉粒间间隙大,局部裂纹数量多。稻谷在干燥温度45℃、缓苏时间3 h、降水幅度1.5%的条件下,稻谷爆腰增率1.0%,干燥速率1.32 g H_2O·min^-1,可在保障稻谷加工品质的同时提高稻谷干燥速率。