Effect of mixing ratio on flow characteristics of binary particles in a fluidized bed

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology Pub Date : 2025-05-18 DOI:10.1016/j.powtec.2025.121132

Qiuqin Gou , Dongmei Song , Haokun Wu , Shiqi Wen , Guoding Chen

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引用次数: 0

Abstract

Understanding the flow characteristics of binary non-spherical particles in a gas-solid spouted bed is important to improve the process design of the equipment. In this paper, the effect of the volume fraction share of spherocylindrical particles versus spherical particles in a binary particle system on the particle fluidization mechanism inside a spouted bed is analyzed by CFD-DEM method. Particle forces, velocities, collisions, mixing, and concentration distribution characteristics were investigated through qualitative and quantitative perspectives, respectively. The results show that with the increase of the volume fraction of spherocylindrical particles in the binary particle system, the drag force of different types of particles increases and the average velocity decreases, which helps to improve the mixing rate of different types of particles, and the rotational velocity of spherocylindrical particles increases and the rotational velocity of spherocylindrical particles decreases, which accelerates the collision frequency of the particles tends to be in a stable state. Increasing the superficial gas velocity helps to increase particle drag force, mixing properties, and rotational velocity. However, the average velocity of the particles does not necessarily increase (e.g., Vol = 25 % and Vol = 50 %). In addition, the spherocylindrical particles contact force is significantly larger than the fluid-particle interaction force, and the values of the forces are, in descending order, particle contact force, pressure gradient force, drag force, virtual mass force, and lift force. Compared with the low bed layer, the particles in the high bed layer are more significantly affected by the gas flow perturbation and the flow is more active.

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混合比对流化床二元颗粒流动特性的影响

了解二元非球形颗粒在气固喷淋床中的流动特性，对改进设备的工艺设计具有重要意义。本文采用CFD-DEM方法分析了二元颗粒体系中球-圆柱颗粒与球形颗粒的体积分数份额对喷淋床内颗粒流化机理的影响。分别从定性和定量的角度研究了颗粒力、速度、碰撞、混合和浓度分布特征。结果表明：随着双颗粒体系中球柱状颗粒体积分数的增加，不同类型颗粒的阻力增大，平均速度减小，有利于提高不同类型颗粒的混合速率；球柱状颗粒的转速增大，球柱状颗粒的转速减小；这使得粒子的碰撞频率趋于稳定。增加表面气体速度有助于增加颗粒阻力、混合性能和旋转速度。然而，粒子的平均速度不一定会增加（例如，Vol = 25%和Vol = 50%）。此外，球柱颗粒接触力明显大于流体-颗粒相互作用力，作用力大小由大到小依次为颗粒接触力、压力梯度力、阻力力、虚质量力和升力。与低床层相比，高床层颗粒受气流扰动的影响更为显著，流动更为活跃。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Powder Technology 工程技术-工程：化工

CiteScore

9.90

自引率

15.40%

发文量

1047

审稿时长

46 days

期刊介绍： Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests: Formation and synthesis of particles by precipitation and other methods. Modification of particles by agglomeration, coating, comminution and attrition. Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces). Packing, failure, flow and permeability of assemblies of particles. Particle-particle interactions and suspension rheology. Handling and processing operations such as slurry flow, fluidization, pneumatic conveying. Interactions between particles and their environment, including delivery of particulate products to the body. Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters. For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.