流态化
之字形的
机械
计算流体力学
离散元法
纵横比(航空)
流化床
体积流量
材料科学
正交数组
生物量(生态学)
粒度
流量(数学)
粒子(生态学)
压力降
表面速度
田口方法
几何学
数学
工程类
复合材料
废物管理
计算机科学
物理
地质学
海洋学
操作系统
作者
Jie Su,Changjiang Zhou,Guanlin Ren,Zizheng Qiao,Yijie Chen
标识
DOI:10.1016/j.powtec.2022.118066
摘要
In order to improve the separation efficiency of clean biomass products and waste, a Z-shaped fluidized bed with multiple inclined channels is developed and applied in industrial production. Particle motion characteristics are studied using the computational fluid dynamics and discrete element method and verified by imaging experiments. The influences of operating parameters on the separation of mixture with different densities are investigated. A L9(34) orthogonal array is proposed to identify the main and secondary factors, and the optimal combination working condition is determined. Results demonstrate that the mixtures collide and separate many times in the inclined fluidization channels. The superficial velocity is the core for the separation efficiency, followed by the aspect ratio, and the conveying speed has a minimum effect. The Z-shaped fluidization system has an optimal performance when the superficial velocity is 6 m/s, the aspect ratio is 15/2.5 mm, the conveying speed is 2 m/s, and the mass flow rate is 0.156/0.033 kg/s. Compared with the average of the orthogonal table, the collection rate of clean products and impurities in the optimal combination increases by 70.4% and 10%, respectively. Moreover, particles are mainly perpendicular to the airflow with a zigzag movement pattern. The core-annulus structure and reflux of particles and gas are observed. The predictions on the biomass distribution agree well with experimental results, and the angle error is less than 14%. These findings will provide helpful guidance on biomass recovery utilization and other cleaner production.
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