细颗粒在锥形和平底料仓中的重力卸料特性

发布时间：2018-06-24 12:03

本文选题：细颗粒 + 重力卸料　；参考：《化工进展》2017年11期

【摘要】：对细颗粒在料仓内的重力卸料特性进行了实验研究,分别考察了颗粒粒径和料仓构型对卸料流率的影响,采用高速摄像仪对料仓出口处颗粒的卸料形态进行捕捉,并分析其周期性。结果表明,随着颗粒粒径的增大,颗粒卸料流率受逆向压力梯度和"空环效应"两种因素共同影响,先增大后基本保持恒定。另外,锥形和平底料仓中细颗粒的卸料形态,均随粒径增大由不稳定的间歇卸料向稳定的连续卸料过渡。在间歇卸料形态下,由于间歇卸料周期较长,锥形料仓的卸料流率要小于平底料仓;在连续卸料形态下,受料仓锥角影响,锥形料仓的卸料流率要大于平底料仓。最后,通过修正逆向压力梯度项,分别建立了适用于锥形和平底料仓的细颗粒重力卸料流率预测模型,卸料流率的预测值和实验值吻合很好。
[Abstract]:The gravimetric unloading characteristics of fine particles in the silo were experimentally studied. The effects of particle size and silo configuration on discharge flow rate were investigated, and the unloading morphology of particles at the outlet of the silo was captured by a high-speed camera. And its periodicity is analyzed. The results show that with the increase of particle size, the discharge rate of the particles is affected by the reverse pressure gradient and the "void ring effect", which increases at first and then remains constant. In addition, the unloading morphology of fine particles in both conical and flat bottom silo is changed from unstable intermittent unloading to stable continuous unloading with the increase of particle size. The discharge rate of the tapered silo is smaller than that of the silo under the condition of intermittent discharge, and the discharge rate of the taper silo is larger than that of the silo under the influence of the cone angle of the silo under the condition of continuous discharge. Finally, by modifying the reverse pressure gradient term, the prediction models of fine gravimetric discharge rate for conical and flat-bottomed bunkers are established, respectively. The predicted discharge flow rate is in good agreement with the experimental data.
【作者单位】：华东理工大学化学工程联合国家重点实验室;华东理工大学煤气化与能源化工教育部重点实验室;
【基金】：中央高校基本科研业务费探索研究基金(222201514017) 国家自然科学基金青年科学基金(21706073)项目
【分类号】：TQ021

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