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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CFD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。
In the pilot-jet fluidized bed with an inner diameter of 182mm, sub-millimeter wide-sieved silicon particles were used as raw materials to study the jetting gas bypass characteristics. The effects of standing bed height, entrained zone height, Effect of Tube Diameter, Spouting Gas Velocity and Fluidizing Gas Velocity on Sparge Gas Bypass Fraction. The results show that the bypass fraction of jetting gas first keeps steady with the increase of jetting gas velocity and then decreases until it reaches a steady value. When the jetting air velocity is small, the bypass fraction increases with the height of the stationary bed, When the velocity is large enough, the change of static bed height has little effect on the fractional bypass fraction. In addition, the fraction of jet gas bypass increases with the increase of fluidized gas velocity and the inner diameter of the guide tube. However, with the height of the guide tube installed Increase and decrease. At the same time, the mathematical model of the gas-solid two-phase flow in the spout-fluidized bed of the guide tube was established by Fluent based on the double-Euler model based on particle dynamics theory. The CFD simulation was used to investigate the effect of the relevant parameters on the simulation results Impact. The results show that the pressure drop is in good agreement with the experimental data and the fluidized appearance is consistent with the experimental results. The established model has a certain accuracy and reliability, which can be an effective way to predict the experimental results.