Published January 7, 2025 | Version v1
Journal article Open

Euler-Lagrange Modeling of Gas-Solid Flow in a Circulating Fluidized Bed Riser: Evaluation and Comparative Analysis

Authors/Creators

  • 1. EDMO icon Universidade Federal de Pernambuco

Description

This study presents the development and evaluation of a Computational Fluid Dynamics (CFD) model utilizing the Euler-Lagrange approach to simulate gas-solid flow within a circulating fluidized bed (CFB) riser. The research aims to enhance the understanding of multiphase dynamics in such systems, addressing limitations of prior Euler-Euler models. Using ANSYS CFX, two types of simulations were performed: initial steady-state simulations were conducted to calibrate and evaluate the models' behavior, followed by transient simulations to investigate the system's time-dependent dynamics. All simulations were isothermal, modeling air as the continuous phase and Nylon-66 particles as the dispersed phase. Key findings indicate that flow movement is concentrated at the riser's inlet, forming a high-intensity jet, with particle velocities aligning with expected values (0.5–2.0 m/s). Pressure distributions exhibited typical patterns for upward two-phase flows, showing significant drops at the inclined solid inlet and stable conditions in the vertical section. While this modeling approach accurately captured turbulent effects in critical inlet regions, the study acknowledges limitations, including computational time constraints and the exclusion of heat transfer effects. This work significantly contributes to the literature by providing a detailed understanding of two-phase flow in risers and offering a robust, comparated Euler-Lagrange computational model that surmounts the inherent practical and informational limitations of purely experimental investigations, laying a solid foundation for future research and optimization in industrial applications like Fluid Catalytic Cracking (FCC) processes.

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Additional details

Funding

National Council for Scientific and Technological Development
465764/2014-2
National Council for Scientific and Technological Development
403842/2022-0
National Agency of Petroleum, Natural Gas and Biofuels
48610.201019/2019-38
Fundação de Amparo à Pesquisa do Estado de São Paulo
2024/10544-2
Fundação de Amparo à Pesquisa do Estado de São Paulo
2024/12259-3

Dates

Submitted
2025-01-07

References

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