导向管喷动流化床内宽筛分硅颗粒流化特性的实验及模拟

发布时间：2018-03-05 17:42

本文选题：导向管喷动流化床　切入点：宽粒度分布　出处：《化工进展》2017年07期 　论文类型：期刊论文

【摘要】：在内径为182mm的导向管喷动流化床中,以亚毫米级的宽筛分硅颗粒为物料,对喷动气旁路特性进行了实验研究,分别考察了静止床层高度、夹带区高度、导向管内径、喷动气速和流化气速对喷动气旁路分率的影响。结果表明喷动气的旁路分率随喷动气速的增加首先保持平稳,随后降低直至保持稳定值;当喷动气速较小时,旁路分率随静止床层高度的增加而增加,当喷动气速足够大时,静止床高的变化对旁路分率影响不大;此外,喷动气旁路分率随流化气速、导向管内径的增加而增大,但随着导向管安装高度的增加而减小。同时,采用基于颗粒动力学理论的双欧拉模型,通过Fluent建立了与冷态实验条件一致的导向管喷动流化床气固两相流的数理模型,经计算流体力学模拟考察了相关参数对模拟结果的影响。结果表明压降与实验值吻合,流态化外观也与实验结果一致。所建立的模型具有一定的准确性和可靠性,可以成为预测实验结果的有效途径。
[Abstract]:In a spouted fluidized bed with an internal diameter of 182 mm, the characteristics of spouted gas bypass were experimentally studied with submillimeter sieving silicon particles. The height of static bed, the height of entrainment zone, and the inner diameter of guide tube were investigated respectively. The results show that the bypass fraction of spouted gas is stable with the increase of the velocity of the spouted gas, and then decreases until the stable value is maintained, and when the velocity of the spouted gas is small, the bypass rate of the spouted gas remains stable. The results show that the bypass rate of the spouted gas is stable with the increase of the velocity of the spouted gas. The bypass rate increases with the increase of static bed height. When the spouted gas velocity is large enough, the variation of the static bed height has little effect on the bypass rate, in addition, with the increase of fluidized gas velocity and the inner diameter of the guide pipe, the bypass rate increases. However, with the increase of the installation height of the guide tube, the mathematical model of gas-solid two-phase flow in the spouted fluidized bed of the guide tube is established by using the dual-Euler model based on the particle dynamics theory and by Fluent, which is consistent with the cold experimental conditions. The influence of relevant parameters on the simulation results is investigated by computational fluid dynamics simulation. The results show that the pressure drop is in agreement with the experimental values and the fluidization appearance is in agreement with the experimental results. The established model is accurate and reliable. It can be an effective way to predict the experimental results.
【作者单位】：天津大学化工学院;
【基金】：国家自然科学基金项目(21676197)
【分类号】：TQ051.13;TQ127.2

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