作　　者： ; ;

机构地区： 浙江大学化学工程与生物工程学系

出　　处： 《化学反应工程与工艺》 1997年第3期283-289,共7页

摘　　要： 在建立４００ｍｍ压力为０．１～２．０ＭＰａ的冷模加压流化床试验装置基础上，对流化床的临界流化速度进行了研究，通过回归实验值得到了临界流化速度的计算式：Ｒｅｍｆ＝［２５．３２＋０．０４３４Ａｒ］１／２－２５．３，一般随压力的提高，临界流化速度减小。同时实验测定了ｄｐ＝５６２μｍ聚乙烯粉料的膨胀特性，通过对秦霁光［１］的床层膨胀计算式（超越方程）的简化得到比较简单而准确模拟实验的床层膨胀高度计算式Ｈ＝Ｈ０＋ＢＨａ０＋ａＡＢＨａ－１０－ＢＡａ１－ＢａＨａ－１０－ａＡＢ（ａ－１）Ｈａ－２０在本实验情况下，实验值与计算值的相对误差小于±６．３％，床层膨胀主要随气速的提高而增高，而压力对此不敏感。此外还测定了分布板的锐孔系数，Ｃ′ｄ＝０．６８６。 Based on  400mm cold model of pressurized fluidized bed, the minimum fluidization velocity is investigatd at pressure 0.1～2.0 MPa and regression, a formula of calculating U mf is attained as follows: Re mf =[25.3 2+0.0434Ar] 1/2 -25.3. The results show a clear decrease in the minimum fluidization velocity with increasing pressure. Also, the bed expansion measurements are carried out by using HDPE powders (diam 562 μm) at pressure 0.1～2.0MPa. A simplified correlation derived from Qin Jiguang′s equation for calculating bed expansion is obtained as follows: H=H 0+BH a 0+aABH a-1 0-BA a1-BaH a-1 0-aAB(a-1)H a-2 0 The experimental results are in good agreament with the simplified correlation and show a clear increase in bed expansion with fluidiziation velocity and little influence of pressure on bed expansion. Additionally, the orifice coefficient of distributor is measured. C′ d is about 0.686.

关 键 词： 加压流态化 流化速度 气相法 计算 聚烯烃

领　　域： [理学] [理学]