论文部分内容阅读
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，可以作为设计加压流化床分布板的设计参数
The critical fluidization velocity of the fluidized bed was studied based on the cold mold pressurized fluidized bed test system with pressure of 0.1 ~ 2.0MPa at 400mm. The critical fluidization velocity was calculated by regression experiment Formula: Remf = [25.32 + 0.0434Ar] 1 / 2-25.3, generally with the pressure increase, the critical fluidization velocity decreases. At the same time, the dp = 562μm dilatant property of polyethylene powder was determined experimentally. By calculating the bed expansive equation (transcendental equation) of Qin light [1], the calculation formula of bed expansive height is simple and accurate. H = H0 + BHa0 + aABHa -10-BAa1-BaHa-10-aAB (a-1) Ha-20 In this experiment, the relative error between the experimental value and the calculated value is less than ± 6.3%. The bed expansion mainly increases with the increase of the gas velocity , While stress is not sensitive to it. In addition, we also measured the sharp hole coefficient of the distribution board, C’d = 0.686, which can be used as the design parameter of designing the pressurized fluidized bed distribution board