高温下流化床流体动力学的数值和实验研究

IF 0.8 Q3 ENGINEERING, MULTIDISCIPLINARY
F. Njuguna, Hiram Ndiritu, B. Gathitu, Meshack Hawi, J. Munyalo
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引用次数: 1

摘要

流化床气化器在高温下运行,高温下流体动力学参数的实验测量困难且耗时,使得计算流体动力学模拟对此类研究有用。在本研究中,使用开源计算流体动力学代码OpenFOAM,使用欧拉-欧拉方法研究了温度对三维流化床模型上流化床流体动力学的影响。粒度为500、335和233 m的硅砂在25和400°C之间的温度下用作床料。为了验证模拟模型,使用实验室规模的流化床装置在相同的温度范围和砂粒尺寸下进行了实验。结果表明,床料的温度对流化床流体力学有很大影响。最小流化速度随砂粒径的增大而增大,但随温度的升高而减小。另一方面,在最小流化点处的床孔隙率随着床材料的温度和粒度而略微增加。进一步的分析表明,在特定的表观速度下,膨胀床的高度随着温度的升高而增加,而气泡的大小随着空气流速和温度的增加而增加。将基于最小流化速度、床层孔隙率和最小流化点压降的数值模型结果与实验结果进行了比较。数值模型的流体动力学结果与实验结果吻合较好。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Numerical and Experimental Investigation of Fluidized Bed Hydrodynamics at Elevated Temperatures
Fluidized bed gasifiers operate at elevated temperatures, and experimental measurements for the hydrodynamic parameters at high temperatures are difficult and time consuming, making computational fluid dynamics simulation useful for such investigation. In this study, Opensource computational fluid dynamics code, OpenFOAM, was used to investigate temperature effect on the fluidized bed hydrodynamics on a 3D fluidized bed model using Eulerian-Eulerian approach. Silica sand of particle sizes of 500, 335 and 233 m was used as the bed materials under temperatures between 25 and 400 °C. To validate the simulation model, a laboratory scale fluidized bed unit was used to conduct experiments for the same range of temperature and sand particle sizes. The results revealed that the temperature of the bed materials greatly affect fluidized bed hydrodynamics. The minimum fluidization velocity increased with the sand particle diameter but decreased with the temperature. On the other hand, the bed porosity at the minimum fluidization point increased marginally with both the temperature and the particle size of the bed materials. Further analysis showed that the expanded bed height increased with the temperature for a specific superficial velocity while the bubbles grew in size with both the air flow rates and the temperature. The numerical model results were compared with the experimental results based on minimum fluidization velocity, bed porosity and pressure drop at the minimum fluidization point. The hydrodynamic results of the numerical model were in good agreement with the experimental results.
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来源期刊
CiteScore
1.80
自引率
14.30%
发文量
62
期刊介绍: "International Journal of Engineering Research in Africa" is a peer-reviewed journal which is devoted to the publication of original scientific articles on research and development of engineering systems carried out in Africa and worldwide. We publish stand-alone papers by individual authors. The articles should be related to theoretical research or be based on practical study. Articles which are not from Africa should have the potential of contributing to its progress and development.
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