Magnetic reduction of gas back-mixing in bubbling fluidized beds with Geldart-B magnetizable particles

IF 4.1 2区材料科学 Q2 ENGINEERING, CHEMICAL Particuology Pub Date : 2024-09-29 DOI:10.1016/j.partic.2024.09.016

Qiang Zhang, Yalong Cao, Wankun Liu, Hao Guan, Donghui Liu, Quanhong Zhu

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Abstract

This study investigated the performance of magnetic fields in reducing gas back-mixing in bubbling fluidized beds with Geldart-B magnetizable particles. The Peclet number (Pe) and axial dispersion coefficient (D_a,g) were determined using the one-dimensional dispersion model. A weak magnetic field reduced gas back-mixing to a certain extent, while a moderate field resulted in minimal decrease. The performance of a strong magnetic field varied significantly depending on the operation mode. Under the magnetization-FIRST operation mode, gas back-mixing was significantly reduced. The corresponding Pe and D_a,g were calculated as ∼76 and ∼3.6 × 10⁻⁴ m²/s, indicating that the gas flow approached the ideal plug-flow manner. However, when the magnetization-LAST operation mode was used, the strong magnetic field failed to mitigate gas back-mixing. Therefore, the performance of magnetic fields in reducing gas back-mixing depended not only on their intensity but also on their application sequence to the gas flow field.

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使用 Geldart-B 磁化颗粒在鼓泡流化床中用磁力减少气体回混

本研究探讨了磁场在减少带有 Geldart-B 可磁化颗粒的鼓泡流化床中气体返混的性能。使用一维分散模型确定了佩克莱特数（Pe）和轴向分散系数（Da,g）。弱磁场在一定程度上减少了气体回混，而中等磁场的减少幅度很小。强磁场的性能因操作模式的不同而有很大差异。在磁化-FIRST 运行模式下，气体反混现象明显减少。计算得出的相应 Pe 和 Da,g 分别为 ∼76 和 ∼3.6 × 10-4 m2/s，表明气体流动接近理想的塞流方式。然而，当采用磁化-LAST 运行模式时，强磁场未能缓解气体回混现象。因此，磁场在减少气体回混方面的性能不仅取决于磁场强度，还取决于磁场在气体流场中的应用顺序。

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来源期刊

Particuology 工程技术-材料科学：综合

CiteScore

6.70

自引率

2.90%

发文量

1730

审稿时长

32 days

期刊介绍： The word ‘particuology’ was coined to parallel the discipline for the science and technology of particles. Particuology is an interdisciplinary journal that publishes frontier research articles and critical reviews on the discovery, formulation and engineering of particulate materials, processes and systems. It especially welcomes contributions utilising advanced theoretical, modelling and measurement methods to enable the discovery and creation of new particulate materials, and the manufacturing of functional particulate-based products, such as sensors. Papers are handled by Thematic Editors who oversee contributions from specific subject fields. These fields are classified into: Particle Synthesis and Modification; Particle Characterization and Measurement; Granular Systems and Bulk Solids Technology; Fluidization and Particle-Fluid Systems; Aerosols; and Applications of Particle Technology. Key topics concerning the creation and processing of particulates include: -Modelling and simulation of particle formation, collective behaviour of particles and systems for particle production over a broad spectrum of length scales -Mining of experimental data for particle synthesis and surface properties to facilitate the creation of new materials and processes -Particle design and preparation including controlled response and sensing functionalities in formation, delivery systems and biological systems, etc. -Experimental and computational methods for visualization and analysis of particulate system. These topics are broadly relevant to the production of materials, pharmaceuticals and food, and to the conversion of energy resources to fuels and protection of the environment.