首页|Simulation of the L-valve in the circulating fluidized bed with a coarse-grained discrete particle method

Simulation of the L-valve in the circulating fluidized bed with a coarse-grained discrete particle method

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Stable and controllable solid flow is essential in circulating fluidized bed(CFB)systems.The L-valve is a typical non-mechanical valve that can provide flexible solid feeding.The investigation of the solid cir-culation rate and the hydrodynamic characteristics of the L-valve is crucial to its design and operation.The gas-solid flow in the L-valve of a full-loop CFB is studied with the coarse-grained discrete particle method(EMMS-DPM).Good agreements on the solid circulation rate and the pressure drop through the L-valve are achieved between the simulated and experimental data.The solid circulation rate increases linearly with the aeration velocity until the stable particle circulation of the CFB is destroyed.The flow patterns in the horizontal section of L-valve are gas-solid slug flow above the stationary solid layer and the moving solid layer,respectively.The effects of L-valve geometric parameters on the solid flow characteristics are also investigated.The results indicate that reducing the diameter and length of the horizontal section of L-valve can improve the solid transport efficiency,especially at low aeration ve-locity.Besides,the solid conveying capacity and flow stability are improved when the sharp bend of L-valve is modified to be a gradual bend.

L-valveCirculating fluidized bedFull loopDiscrete particle methodGas-solid flow

Ruixiang Tang、Zheng Zou、Ji Xu、Junwu Wang、Qingshan Zhu、Hongzhong Li

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State Key Laboratory of Mesoscience and Engineering,Institute of Process Engineering,Chinese Academy of Sciences,P.O.Box 353,Beijing,100190,China

School of Chemical Engineering,University of Chinese Academy of Sciences,Beijing,100049,China

Innovation Academy for Green Manufacture,Chinese Academy of Sciences,Beijing,100190,China

National Natural Science Foundation of ChinaScience Fund for Creative Research Groups of the National Natural Science Foundation of ChinaNational Key Research and Development Program of ChinaState Key Laboratory of Multiphase Complex Systems

22278404219210052023YFC2908002MESO-23-A03

2024

10.1016/j.partic.2023.12.009

颗粒学报(英文版)
中国颗粒学会　中国科学院过程工程研究所

颗粒学报(英文版)

CSTPCD
影响因子：0.632
ISSN：1674-2001
年,卷(期)：2024.90(7)
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