Hydrodynamic behaviors of an internally circulating fluidized bed with wide-size-distribution particles for preparing polysilicon granules

Li, Peilong; Yu, Xinyu; Liu, Fang; Wang, Tiefeng

doi:10.1016/j.powtec.2015.04.075

Cited by 16 publications

(5 citation statements)

References 21 publications

(26 reference statements)

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“…This will result in good mixing and will reduce the segregation of biomass particles to the bed surface, along with the reduction in the elutriation of fine carbon particles, ultimately improving the yield and quality of the product gas. Similarly, the fluidization of wide size distribution (WSD) particles in an ICFB was found to be better than the conventional fluidized bed along with a considerable minimization in the segregation of the WSD particles due to continuous solid recirculation (Li et al, 2015).…”

Section: Introductionmentioning

confidence: 98%

Eulerian-Eulerian Simulations of the Hydrodynamics of a Binary Mixture in an Internally Circulating Fluidized Bed

Hassan¹,

Lu²,

Liu³

et al. 2018

Braz. J. Chem. Eng.

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The process of solid circulation in an internally circulating fluidized bed (ICFB) having two or more chambers can be developed by applying unequal gas velocities in these chambers. Such a process is beneficial to several applications and provides the means for the energy transfer between the chambers in the ICFB. In this paper, a multi-fluid CFD model incorporating the kinetic theory of granular flow is used to simulate the hydrodynamic characteristics of a binary mixture of particles in an ICFB using ANSYS-Fluent software. The mixture is composed of two particles of different sizes but the same densities. The ICFB has two chambers named the reaction chamber (RC) and the heat exchange chamber (HEC), separated by a vertical central baffle. An increase in the RC gas velocity U R at constant HEC gas velocity U H results in an increase in the circulation rate of the binary mixture. The circulation rate of small particles GB s is found to be higher than that of the big particles GB b. Increasing the slot size causes a decrease in the pressure difference between the chambers and consequently decreasing the solid circulation rate in the ICFB. The mixture circulation rate also decreases when the mixture is richer in GB b particles than in GB s .

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Section: Introductionmentioning

confidence: 98%

Eulerian-Eulerian Simulations of the Hydrodynamics of a Binary Mixture in an Internally Circulating Fluidized Bed

Hassan¹,

Lu²,

Liu³

et al. 2018

Braz. J. Chem. Eng.

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“…Solar power, as a renewable energy source, has gained widespread attention due to its abundant supply and environmental sustainability . The polycrystalline silicon material plays a crucial role in the production of solar cells, converting solar energy into electricity with high efficiency. , Purification of solar-grade silicon into volatile liquids, such as trichlorosilane (TCS), is a common method crucial to the development of the solar industry. − Spouted bed reactors are commonly employed for the production of TCS due to the advantages of efficient gas–solid mixing, high heat and mass transfer efficiency, and effective temperature control. However, the complexity of the multiphase flow process and heat and mass transfer process in the reactor is intensified by the coupling of gas–solid flow and chemical reaction.…”

Section: Introductionmentioning

confidence: 99%

Simulation Study of Solar-Grade Silicon Hydrochlorination to Trichlorosilane in a Gas–Solid Spouted Bed via the MP-PIC Method

Liu,

Yang,

et al. 2023

Ind. Eng. Chem. Res.

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The production of silicon is crucial for advancing the solar industry. This study employs the multiphase particle-in-cell technique to investigate the mechanism of heat and mass transfer between gas and solid phases during the trichlorosilane production process. The studied reactor is subjected to multiphysics analysis in three-dimensional space. Moreover, the effects of various operating conditions on the gas–solid flow and trichlorosilane production are fully explored. The simulation results are compared against the experimental data to confirm the reliability of the model. The results show that the annular regions exhibit low concentrations of silicon particles and heat transfer coefficients, whereas the spout regions exhibit high concentrations. The internal circulation of the reactor results in a symmetrical distribution of the axial mass fluxes of gases and particles. The axial dispersion coefficient of the silicon particle in the reactor significantly exceeds the radial dispersion coefficient. Furthermore, the wall temperature exerts an obvious effect on the distribution of silicon particle temperature compared to the inlet HCl flow rate and particle size. The three operating conditions have limited influence on the axial distribution of the heat transfer coefficient of silicon particles. Compared to the wall temperature, the HCl flow rate and silicon particle size have a greater impact on the production of SiHCl3.

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“…With excellent optical, electrical, and thermal properties, high‐purity electronic grade polysilicon material has become the pillar of the modern information industry and the solar photovoltaic industry. However, the problems of production cost and product quality are obstacles in the production of solar photovoltaic cells and semiconductors . At present, the improved Siemens method accounts for ∼75 % of the total output in the world, and polysilicon produced by this method has a high purity.…”

Section: Introductionmentioning

confidence: 99%

Effect of bed geometry on operating pressure drop and minimum fluidizing velocity in a draft tube spout‐fluid bed

Zhang

Huang

et al. 2019

Can J Chem Eng

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Operating pressure drop and minimum fluidizing velocity were studied in a flat spout-fluid bed using sub-millimetre grade silicon particles. The influence of introducing a nonporous draft tube of different configurations as well as fluidizing gas on the two parameters was investigated. A comparison of fluidizing gas systems indicated that introduced gas restrained gas bypassing to lower the minimum fluidizing velocity; however, the operating pressure drop was higher than systems without the existence of fluidizing gas. Two new correlations that took into account the effects of bed geometry and fluidizing gas on the operating pressure drop and minimum fluidizing velocity were developed based on the experimental data, which were in agreement with the present experiments.

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Hydrodynamic behaviors of an internally circulating fluidized bed with wide-size-distribution particles for preparing polysilicon granules

Cited by 16 publications

References 21 publications

Eulerian-Eulerian Simulations of the Hydrodynamics of a Binary Mixture in an Internally Circulating Fluidized Bed

Eulerian-Eulerian Simulations of the Hydrodynamics of a Binary Mixture in an Internally Circulating Fluidized Bed

Simulation Study of Solar-Grade Silicon Hydrochlorination to Trichlorosilane in a Gas–Solid Spouted Bed via the MP-PIC Method

Effect of bed geometry on operating pressure drop and minimum fluidizing velocity in a draft tube spout‐fluid bed

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