CFD-DEM study of the effect of ring baffles on system performance of a full-loop circulating fluidized bed

Wang, Shuai; Luo, Kun; Hu, Chenshu; Fan, Jianren

doi:10.1016/j.ces.2018.10.056

Cited by 45 publications

(7 citation statements)

References 62 publications

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“…It is worth noting that the axial silicon dispersion coefficient is 2 orders of magnitude larger than the radial silicon dispersion coefficient due to the HCl gas moving upward. This observation is consistent with previous experiments and simulation studies on the dissipation coefficient in spouted beds. − In addition, the consistency between the D x and D y curves implies that the radial movement of silicon particles in the cylindrical spouted bed exhibits good uniformity.…”

Section: Resultssupporting

confidence: 91%

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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Section: Resultssupporting

confidence: 91%

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 gas–solid governing equations are listed in Table . Specifically, the solid phase movement, including the translational and rotational components, is described by Newton’s second law in the soft-sphere model framework. − A simplified Hertz–Mindlin and Deresiewicz model − is used to calculate the normal force, while the tangential force is based on the Langston et al model . The rolling frictional force is also considered to increase the simulation accuracy .…”

Section: Methodsmentioning

confidence: 99%

Particle-Scale Study of the Effect of Operating Conditions on Spout Deflection Behavior in a Flat-Bottomed Spout-Fluidized Bed

Yue

Shen

2019

Ind. Eng. Chem. Res.

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Spout deflection is a common instability phenomenon in spout-fluidized beds. The hydrodynamics of spout deflection under several key operating variables, including static bed height (H 0), background velocity (U bg), and reactor column width (W), is investigated by means of the computational fluid dynamic-discrete element method (CFD-DEM) coupling approach. The results show that non-alternating spout deflection can be easily observed when the H 0 is larger than 236 mm or the W is less than 0.14 m in this study. For alternating spout deflection, first, there is an upper limit for its amplitude because of the self-locking phenomenon in the bottom corner. Large W promotes the regularity, while the effects of H 0 on regularity is neglectable. Thirdly, the main frequency of the alternating spout deflection reduces with increasing H 0 and increasing U bg and finally stabilizes at 1.7 Hz. This study sheds light on the design, optimization, and operation of spout-fluidized beds.

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“…As in the FCC process, internals should not create any swirl pattern that would concentrate particles near the wall through centrifugal forces . In FCC risers, ring baffles have been used to promote mixing between the solid-rich annulus and the gas-rich core, − increasing the gasoline yield . In fluid cokers, ring baffles can be used to hinder solid mixing between the reaction zone and the stripping zone, significantly reducing hydrocarbon carryunder to the stripper. ,, Equipping the baffles with downcomers that allow for downward solid flow and upward gas flow improves baffle performance…”

Section: Reactormentioning

confidence: 99%

Review of Research Related to Fluid Cokers

Briens

McMillan

2021

Energy Fuels

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Fluid coking is a thermal conversion process that uses a conventional two-vessel circulating fluidized bed to convert heavy hydrocarbon feeds to lighter products. The technology was developed in the 1950s and since then has been used commercially around the world to upgrade heavy oils from various sources. Research work has been summarized related to all aspects of the fluid coking process, including reaction fundamentals, bed hydrodynamics, liquid distribution and jet–bed interaction, mixing of solid particles and agglomerates, mixing of vapors, control of the particle size, cleaning of the vapor stream in the scrubber, cleaning of the cold coke in the stripper, process monitoring, coke transfer lines, and the burner. The fluid coking process involves complex interactions between fluidized bed hydrodynamics, liquid feed injection, and reaction kinetics, and research tools that can take into account all of these interacting variables are requited to test methods to optimize the process. Fluid cokers can process many different types of feeds, and future applications may include blending and co-processing a variety of feedstocks ranging from waste plastics, pyrolytic bio-oil, and off-spec vegetable oils with heavy oil. The findings from this summary are also relevant for other applications that inject liquid into fluidized beds, such as the fluid catalytic cracking process, olefin polymerization cooled by liquid injection, granulators, and coaters.

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CFD-DEM study of the effect of ring baffles on system performance of a full-loop circulating fluidized bed

Cited by 45 publications

References 62 publications

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

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

Particle-Scale Study of the Effect of Operating Conditions on Spout Deflection Behavior in a Flat-Bottomed Spout-Fluidized Bed

Review of Research Related to Fluid Cokers

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