New method for the investigation of particle mixing dynamic in a spout-fluid bed

Zhang, Yong; Wang, Zhong; Jin, Baosheng

doi:10.1016/j.powtec.2011.01.011

Cited by 21 publications

(7 citation statements)

References 39 publications

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“…However, the assumption in their work that the fuel particles and the inert sand particles share the same dispersion rate makes it less reasonable because these two types of particles are typically different in size and density. Actually, the physical properties such as size, density, and shape have been experimentally identified to remarkably affect the dispersion and mixing behaviors of particles in the fluidized beds. ,,,− To deal with the considerable size difference between the fuel particles and bed material particles, Farzaneh et al , further developed a novel multigrid Lagrangian technique to investigate the bigger fuel particle movement in a fluidized bed of finer bed particles under various operating conditions. They compared the preferential positions and dispersion coefficients of fuel particles obtained from simulations with those obtained from experiments, and also determined the ascending and descending velocity of fuel particles.…”

Section: Introductionmentioning

confidence: 99%

CFD–DEM Investigation of Fuel Dispersion Behaviors in a 3D Fluidized Bed

Lian

Wang

Liu

2021

Ind. Eng. Chem. Res.

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In this paper, dispersion behaviors of continuous-feeding fuel particles in a 3D fluidized bed were studied in detail using CFD–DEM simulations with a substantial difference in particle properties between the fuel and bed material, as well as the dynamic fuel-feeding process being reasonably considered. By quantitively evaluating the dispersion characteristics of fuel particles, the effects of key factors including the fluidization velocity, initial bed height, and the particle properties of fuel and bed materials on the dispersion behaviors of fuel particles were comprehensively examined with the motion and distribution of fuel particles being discussed in detail. The results indicated that crucially dominated by the bubble behaviors, the axial dispersion coefficient of fuel particles is 1–2 orders-of-magnitude larger than that in the radial direction in the fluidized bed. Increasing the fluidization velocity obviously promotes the dispersion and thus the uniformity distribution of the fuel particles. More intense axial dispersion of fuel particles appears with the higher initial bed height, under which conditions the axial distribution uniformity of fuel particles is efficiently improved. On the other hand, using the finer bed material enhances the fuel dispersion at the same fluidization velocity but instead weakens the dispersion at a similar fluidization number. Furthermore, the low-density fuel particles have a larger dispersion coefficient, which can be mainly explained by their preferential distribution behavior in the dense bed surface region.

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Section: Introductionmentioning

confidence: 99%

CFD–DEM Investigation of Fuel Dispersion Behaviors in a 3D Fluidized Bed

Lian

Wang

Liu

2021

Ind. Eng. Chem. Res.

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“…The chemical analysis of samples and subsequent comparison of quantities of substances in respective samples under consideration are other known methods [10,11]. Zhang et al (2011) [12] have suggested a new method of analysing indicators in the fluidised bed, that comes forward with integration of microwave warming with infrared thermovision. As a result of continual warming of indicators, they underwent continual monitoring in the fluidised bed.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Reliability of Mixing Process in Diverse Mixers

et al. 2020

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Homogeneity of fodder blends is one of the primary fodder blend quality criteria. Inadequate mixing of fodder ingredients may cause insufficient growth of livestock and unsuccessful medical treatment in the case of healing fodder. Majority of fodder producers make use of the information contained in the fodder blend technical dossier for the purpose of target mixing parameters. However, average mixing time, that is very often specified, does not reflect the specific nature of a given fodder blend. Apart from the fodder blend construction parameters, physical properties of raw materials used for production purposes, in particular disintegration degree, fodder blend discharge manner, filling degree have an impact upon the homogeneity of mixing. The research on the homogeneity of mixing in various fodder producers has proven the necessity to control this stage of production.

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“…It was found that the mixing rate in the vertical direction is higher than the lateral direction. Zhong et al 25 and Zhang et al 26 developed a new method to study the mixing behavior of dissimilar particles, in which specially made particles (d p = 2.8 mm) were continuously heated by microwave and captured using an infrared camera. It was found that the mixing process is accelerated by the increase in gas velocity and difference in density.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive Study on the Mixing Behavior of Small Dissimilar Particles in a Fluidized Bed

Huang

Dong

et al. 2020

Ind. Eng. Chem. Res.

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The treatment of dissimilar particles in a fluidized bed reactor is needed in many chemical industries, and detailed knowledge of mixing behavior of dissimilar particles is critical to design the reactor. Because dissimilar particles must be large enough to be differentiated in the bed frozen method, or to be clearly captured using an imaging system in the particle tracking method, former experimental research studies mainly concentrated on the mixing behavior of large particles (d p = 1.1−10 mm). For this problem, a novel research on particle mixing is carried out in this paper that emphasis is laid on the mixing behavior of small binary particles with the diameter being only 0.55 mm. The measurement problem is solved by developing a new measurement system of particle mixing based on the capacitance probe. Real-time mixing states at various positions of the fluidized bed from initially segregated to finally steady mixing are analyzed in detail and new phenomenon of small particle mixing is observed. The results show that the volumetric mixing ratio of jetsam particles decreases directly with fluidization time at the lower part of the fluidized bed, while significant fluctuations are found at the middle and upper part; final particle mixing is more uniform at the middle and upper part of fluidized bed than that at the lower part and near the wall; compared with coarse dissimilar particles, the mixing of small dissimilar particles is slower but more uniform in the end. Mixing behavior of small dissimilar particles is revealed by experiments for the first time. The findings may provide theoretical guidance for enhancing heat and mass transfer efficiency in fluidized bed reactors dealing with small particles and also enrich the fluidization theory.

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New method for the investigation of particle mixing dynamic in a spout-fluid bed

Cited by 21 publications

References 39 publications

CFD–DEM Investigation of Fuel Dispersion Behaviors in a 3D Fluidized Bed

CFD–DEM Investigation of Fuel Dispersion Behaviors in a 3D Fluidized Bed

Assessment of Reliability of Mixing Process in Diverse Mixers

Comprehensive Study on the Mixing Behavior of Small Dissimilar Particles in a Fluidized Bed

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