Article
Engineering, Chemical
Jiao Zhou, Weikang Hao, Quanhong Zhu
Summary: The intensification of mass transfer between fluidizing gas and Geldart-B nonmagnetizable particles was significantly enhanced by the magnetic field in the magnetic stabilization and transition flow regimes. This enhancement depended on both the intensity of the magnetic field (H) and the operation mode. Gas-solid contact performance in the magnetic stabilization flow regime was comparable to that in fixed beds.
Article
Engineering, Chemical
Suyang Pan, Jiliang Ma, Daoyin Liu, Xiaoping Chen, Cai Liang
Summary: This paper studies the liquid transport behaviors in a top-sprayed fluidized bed using bed conductance analysis, pressure fluctuation analysis, and bubble image processing. The results show that liquid initially gets trapped in agglomerates before converting to free liquid and spreading from the upper-middle bed to the bottom bed. The disintegrating pattern of agglomerates affects the increase and saturation of free liquid in the bed. The liquid transport process is accelerated by increasing superficial air velocity and particle diameter, while it slows down with increased liquid viscosity and surface tension.
Article
Engineering, Chemical
Quanhong Zhu, Libo Zhang, Weikang Hao
Summary: This study aimed to define and determine the minimum fluidization velocity in magnetized fluidized beds (MFB) based on physics principles, resolving controversies in the field. Different methods and requirements for determining U-mf were identified for MFB with different types of particles. Experimental results showed that U-mf remained invariant in both types of MFB.
Article
Food Science & Technology
Dong-Hyun Lim, Andres Letona, Minjeong Lee, Dayoung Lim, Nam-Soo Han, Donghwa Chung
Summary: The probiotic powder of poor flowability prepared by spray drying reconstituted skim milk fermented with Lactobacillus rhamnosus GG was granulated using fluidized-bed granulation. The addition of skim milk powder and moisture activation improved the performance of the granulation process, leading to increased yield and narrower particle size distribution. The granules showed a popcorn-type structure and contained viable LGG cells, exhibiting better flowability and dispersibility than the original spray-dried powder.
Article
Food Science & Technology
Donghyeon Lee, Gyeongeon Min, Wooseok Roh, Byoungseung Yoo
Summary: Agglomeration of fine gum powders using sugar binders can enhance their physical properties, resulting in larger particles and higher porosity. The combination of different gums and sugar solutions during agglomeration affects the flowability and structural properties of the powders.
Article
Materials Science, Multidisciplinary
Chuanfu Li, Yan Liu, Yuelong Wu, Xiaolong Li, Tingan Zhang
Summary: To reduce energy consumption and CO2 emissions, fluidized bed ironmaking technology with hydrogen as a reducing agent has been studied. In this research, numerical simulation was used to examine the impacts of reducing gas composition and agitation speed on the gas-solid fluidization quality in the fluidized bed with an inclined agitator. The results show that the iron ore powder exhibits better fluidization effect when the volume ratios of H-2 to CO and H-2 to N-2 are 1:1.
Article
Engineering, Environmental
Amine El Mansouri, Alain Guette, Nathalie Bertrand, Gerard L. Vignoles
Summary: SiC powders coated with pyrocarbon have potential for synthesis of ceramic-matrix composites. A study on non-porous and porous alumina powders as substrates has been conducted using low pressure Fluidized-Bed Chemical Vapor Deposition (FB-CVD) with propane as a precursor at 1000 degrees C. Optimized deposition yields up to 100% were achieved, even inside very small pores (7 nm) and on 200-nm diameter SiC powders. The microstructure and texture of the deposits were dependent on pore size due to a texture-induction effect by the substrate surface.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Chemical
Huibin Xu, Weiyu Wang, Wenqi Zhong, Chi Ma, Hao Zhang
Summary: The pressurized bubbling fluidized bed is advantageous for treating municipal solid waste due to its ability to effectively capture CO2 and enhance the combustion and gasification process. This study experimentally investigated the fluidization characteristics of Geldart-D particles at elevated pressure, including flow pattern, pressure drop, and minimum fluidization gas velocity. The results showed that the fluidization behavior of Geldart-D particles changed with increasing operating pressure, indicating a transition towards the behavior of Geldart-B particles. A new correlation for predicting the minimum fluidization velocity of Geldart-D particles at elevated pressure was proposed based on the experimental data.
ADVANCED POWDER TECHNOLOGY
(2022)
Article
Engineering, Chemical
Yongli Ma, Mingyan Liu, Chen Li, Xiuhong Zhou
Summary: Gas-liquid-solid circulating fluidized bed (GLSCFB) is an important reactor with critical radial hydrodynamics for industrial design and scale-up. A mesoscale method based on the energy-minimization multiscale principle is used to model the radial flow structures, which can reasonably predict the radial distributions of flow parameters and analyze the influence of operating conditions on radial hydrodynamics in GLSCFB.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Energy & Fuels
Robin Faust, Panida Aonsamang, Jelena Maric, Alyona Tormachen, Martin Seemann, Pavleta Knutsson
Summary: Thermal conversion of automotive shredder residue (ASR) using indirect fluidized bed gasification was conducted, with a focus on the interactions between the bed material and the ASR ash. Iron deposition onto olivine particles was observed, potentially increasing their oxygen-carrying ability. A significant portion of the particles in the bed originated from the ASR ash, containing Fe, Si, Zn, Ti, Cu, with some particles exhibiting a hollow morphology suggesting a melt state during formation.
Article
Engineering, Chemical
Taishi Ichise, Yuji Tatemoto
Summary: This study examines the drying characteristics of a spherical frozen material using a fluidized bed drying method. The heat and mass transfers during the drying process were calculated using one-dimensional differential equations. The results indicate that sublimation within the material governs the drying characteristics, and the dry region within the material exhibits resistance to heat transfer.
ADVANCED POWDER TECHNOLOGY
(2022)
Article
Engineering, Chemical
Runhui Zhang, Xiaoke Ku, Kun Luo, Jianzhong Lin
Summary: A comprehensive model has been developed to study the bubble dynamics and particle orientation in a binary fluidized bed, revealing the effects of particle aspect ratio and the addition of spherocylinders on mixing and bubble generation in the bed.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Engineering, Environmental
Chuanpeng Zhang, Renshuai Zhu, Yanpei Chen, Wei Wang, Tomohiko Furuhata
Summary: The configuration-dependent dynamics of non-spherical particles were experimentally investigated in a quasi-two-dimensional gas-solid fluidized bed. It was found that the vertical velocity profiles were sensitive to the aspect ratio at low gas velocity but not at high gas velocity. The velocity distribution, particularly the rotational velocity distribution, deviated from the Maxwellian distribution. The joint probability density distribution of vertical and rotational velocity was asymmetric. Two high-probability particle configurations, two particles in a parallel or vertical arrangement, were identified by calculating various functions. The cause of this order appearance was explained through entropy theory. The drag force of the particle configurations at different angles and Re was compared, demonstrating the necessity of considering configuration-dependent drag force for non-spherical particle fluidization.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Chemical
Bo Zhang, Mengyao Guo, Zongsheng Sun, Enkhsaruul Byambajav, You Zhou, Junwei Guo, Pengfei Zhao, Zhenxing Zhang, Xuan Wang, Guanghui Yan
Summary: The apparent viscosity of binary particles decreases with the increase in coal powder content, and also drops by half with increase in gas speed. Adjusting gas velocity and magnetite powder content can effectively reduce the apparent viscosity and improve separation efficiency. A modified model for predicting the apparent viscosity of binary particles showed good performance with an overall standard deviation of 13.00% from experimental results.
Article
Engineering, Chemical
Frederik Zafiryadis, Anker Degn Jensen, Weigang Lin, Elisabeth Akoh Hove, Morten Boberg Larsen, Hao Wu
Summary: This study utilizes the Eulerian-Lagrangian multiphase particle-in-cell method to simulate the injection of a gas-liquid spray into a gas-solid fluidized bed. The model accurately predicts the gas temperature distribution within the injection region, but discrepancies may arise due to the presence of wet particle agglomerates in the spray region.
CHEMICAL ENGINEERING SCIENCE
(2022)