Numerical study of the hydrodynamics of fluidized beds operated under sub-atmospheric pressure

Zarekar, Sayali; Bück, Andreas; Jacob, Michael; Tsotsas, Evangelos

doi:10.1016/j.cej.2019.04.159

Cited by 11 publications

(4 citation statements)

References 59 publications

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“…Together with the surface area, the density of catalyst particles strongly influences the surface velocity of the fluid. In this regard, dense particles, which consist of non-porous materials, will require a higher velocity than porous materials such as activated carbon [79,83]. Hence, there are advantages of using activated carbon as MnO 2 catalytic support over denser α-MnO 2 nanoparticles.…”

Section: Catalytic Materials and Surface Velocity Of Fluid In The Fbrmentioning

confidence: 99%

Removal of Aniline and Benzothiazole Wastewaters Using an Efficient MnO2/GAC Catalyst in a Photocatalytic Fluidised Bed Reactor

et al. 2021

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This work presents an efficient method for treating industrial wastewater containing aniline and benzothiazole, which are refractory to conventional treatments. A combination of heterogeneous photocatalysis operating in a fluidised bed reactor is studied in order to increase mass transfer and reduce reaction times. This process uses a manganese dioxide catalyst supported on granular activated carbon with environmentally friendly characteristics. The manganese dioxide composite is prepared by hydrothermal synthesis on carbon Hydrodarco® 3000 with different active phase ratios. The support, the metal oxide, and the composite are characterised by performing Brunauer, Emmett, and Teller analysis, transmission electron microscopy, X-ray diffraction analysis, X-ray fluorescence analysis, UV–Vis spectroscopy by diffuse reflectance, and Fourier transform infrared spectroscopy in order to evaluate the influence of the metal oxide on the activated carbon. A composite of MnO2/GAC (3.78% in phase α-MnO2) is obtained, with a 9.4% increase in the specific surface of the initial GAC and a 12.79 nm crystal size. The effect of pH and catalyst load is studied. At a pH of 9.0 and a dose of 0.9 g L−1, a high degradation of aniline and benzothiazole is obtained, with an 81.63% TOC mineralisation in 64.8 min.

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Section: Catalytic Materials and Surface Velocity Of Fluid In The Fbrmentioning

confidence: 99%

Removal of Aniline and Benzothiazole Wastewaters Using an Efficient MnO2/GAC Catalyst in a Photocatalytic Fluidised Bed Reactor

et al. 2021

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“…Therefore, it is widely used as a heat source and power source, and as a substitute for fossil fuels, it has made a significant contribution to global energy production . The conversion of biomass energy is a multiscale, multiphysical, and complex process, and the yield and performance of different biomass depend on the chemical composition of the molecules, physical parameters of the particles, and operating parameters of the reactor. − Since a fluidized bed has the advantages of high heat and mass transfer efficiency, wide fuel adaptability, high mixing characteristics, and there are many successful cases of biomass fluidized bed energy conversion at both the laboratory and industrial scales, it is widely used in various fields, such as biopreparation, chemical, oil exploitation, and biomass reaction. , However, the particle flow characteristics inside the bubbling fluidized bed are complex and widely used, so it has been a hot spot for research. , …”

Section: Introductionmentioning

confidence: 99%

“… 6 , 7 However, the particle flow characteristics inside the bubbling fluidized bed are complex and widely used, so it has been a hot spot for research. 8 , 9 …”

Section: Introductionmentioning

confidence: 99%

Effects of Particle Diameter and Inlet Flow Rate on Gas–Solid Flow Patterns of Fluidized Bed

et al. 2023

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The complex multiscale characteristics of particle flow are notoriously difficult to predict. In this study, the evolution process of bubbles and the variation of bed height were investigated by conducting high-speed photographic experiments to verify the reliability of numerical simulations. The gas–solid flow characteristics of bubbling fluidized beds with different particle diameters and inlet flow rates were systematically investigated by coupling computational fluid dynamics (CFD) and discrete element method (DEM). The results show that the fluidization in the fluidized bed will change from bubbling fluidization to turbulent fluidization and finally to slugging fluidization, and the conversion process is related to the particle diameter and inlet flow rate. The characteristic peak is positively correlated with the inlet flow rate, but the frequency corresponding to the characteristic peak is constant. The time required for the Lacey mixing index (LMI) to reach 0.75 decreases with increasing inlet flow rate; at the same diameter, the inlet flow rate is positively correlated with the peak of the average transient velocity; and as the diameter increases, the distribution of the average transient velocity curve changes from “M” to linear. The results of the study can provide theoretical guidance for particle flow characteristics in biomass fluidized beds.

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“…In paper [41], a dehumidification system with a circulating fluidized bed was designed to achieve high dehumidification performance and continuous operation by circulating desiccant particles without a motor. Researchers have already made the first attempts to describe the hydrodynamic behavior of fluidized beds operated under reduced pressure [42,43]. The first literature reports indicate the possibility of a significant improvement of heat transport conditions due to implementing of a fluidized layer in the adsorption bed [44,45].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of an Intensified Heat Transfer Adsorption Bed (IHTAB) Reactor Prototype

et al. 2021

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The first experience in the operation of intensified heat transfer adsorption bed reactor designed for low-pressure adsorption processes is presented in this paper. This work aims to assess the possibility of fluidizing the porous media bed induced by the pressure difference between the evaporator and the adsorption reactor. The conducted experimental research allowed indicating the type of silica gel recommended to use in fluidized beds of adsorption chiller. The fixed bed of silica gel was observed for the lower pressure differences, while fluidization appeared in the case of the pressure difference between the evaporator and the adsorption chamber higher than 1000 Pa. The most significant differences in the adsorption process between the fixed bed and the fluidized bed are revealed in the changes of sorbent temperatures. The silica gel bed was fluidized with water vapor generated in the evaporator.

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Numerical study of the hydrodynamics of fluidized beds operated under sub-atmospheric pressure

Cited by 11 publications

References 59 publications

Removal of Aniline and Benzothiazole Wastewaters Using an Efficient MnO2/GAC Catalyst in a Photocatalytic Fluidised Bed Reactor

Removal of Aniline and Benzothiazole Wastewaters Using an Efficient MnO2/GAC Catalyst in a Photocatalytic Fluidised Bed Reactor

Effects of Particle Diameter and Inlet Flow Rate on Gas–Solid Flow Patterns of Fluidized Bed

Experimental Investigation of an Intensified Heat Transfer Adsorption Bed (IHTAB) Reactor Prototype

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