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在一套准φ80mm×4090mm有机玻璃冷模试验装置中,以油页岩热解飞灰为试验物料,使用在线压力采集系统,测定了流化床轴向平均颗粒密度分布,根据稀相空间平均颗粒密度获得了输送分离高度(TDH)和气体饱和夹带量(εp∞),并与FCC催化剂颗粒的流化夹带特性进行了对比。试验结果表明,对于密度相近的两种物料,尽管油页岩热解飞灰的平均粒径小于FCC催化剂,但同一表观气速下流化床内各截面平均颗粒密度均低于FCC催化剂。表观气速较低时(u=0.22m/s),两种物料的TDH和气体饱和夹带量基本相等;随着气速的提高,FCC催化剂的TDH和气体饱和夹带量逐渐高于油页岩热解飞灰;当表观气速大于0.88m/s时,油页岩热解飞灰的TDH逐渐接近于FCC催化剂。对试验结果进行关联分析后,建立了油页岩热解飞灰TDH和气体饱和夹带量的经验模型,计算值与试验值吻合较好。
In a set of quasi-φ80mm × 4090mm plexiglass cold-model test device, using oil shale pyrolyzed fly ash as test material, the on-line pressure acquisition system was used to determine the axial average particle density distribution of the fluidized bed. Particle densities were obtained for both transport separation height (TDH) and gas saturation entrainment (εp∞) and were compared with the fluidized entrainment characteristics of FCC catalyst particles. The experimental results show that for both materials with similar density, the mean particle size of each section in the fluidized bed at the same apparent gas velocity is lower than that of the FCC catalyst, although the average particle size of the pyrolysis fly ash in the oil shale is smaller than that of the FCC catalyst. With lower apparent gas velocity (u = 0.22m / s), the TDH and gas saturation entrainment of the two materials were almost equal. With the increase of gas velocity, the TDH and gas saturation entrainment of FCC catalyst were gradually higher than that of oil Rock pyrolysis fly ash; when the apparent air velocity is greater than 0.88m / s, the TDH of pyrolysis fly ash of oil shale gradually approaching the FCC catalyst. After correlation analysis of the test results, an empirical model of TDH and saturated gas entrainment in pyrolysis fly ash of oil shale was set up. The calculated values agree well with the experimental values.