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用于甲醇制烯烃（MTO）工艺的冷循环流化床的流体动力学：实验与计算研究

Hydrodynamics of a cold circulating fluidized bed for methanol-to-olefins (MTO) process: experimental and computational investigation.

作者信息

Babaei Mojtaba, Movahedirad Salman

机构信息

School of Chemical Engineering, Iran University of Science and Technology, Tehran, Iran.

出版信息

Sci Rep. 2023 Oct 26;13(1):18349. doi: 10.1038/s41598-023-45326-6.

DOI:10.1038/s41598-023-45326-6
PMID:37884569
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10603125/
Abstract

The present study aims to investigate the hydrodynamic behavior of gas-solid flow in a pseudo-two-dimensional cold circulation fluidized bed specifically designed to mimic a plane cut of an industrial methanol-to-olefins (MTO) bed. The solid velocity pattern was experimentally examined using the Particle Image Velocimetry with Digital Image Analysis (PIV-DIA) technique. The hydrodynamics of this pseudo-2D bed were studied using the twoPhaseEulerFoam solver in OpenFOAM, and the adjusted solver was validated through solid particle velocity and solid volume fraction comparisons, showing good agreement with experimental data. Additionally, the study explores different geometries, including symmetric and asymmetric baffles, to understand their impact on the mixing characteristics of the circulating fluidized bed for MTO. The findings highlight the significant role of asymmetric baffles in enhancing mixing behavior. Furthermore, the DIA technique was employed to study the effects of bubbles on gas-solid mixing, revealing that the low mixing region of the bed limited the diameter of bubbles.

摘要

本研究旨在研究一种专门设计用于模拟工业甲醇制烯烃（MTO）床层平面截面的准二维冷循环流化床内气固流动的流体动力学行为。使用带有数字图像分析的粒子图像测速技术（PIV-DIA）对固体速度模式进行了实验研究。使用OpenFOAM中的两相EulerFoam求解器研究了这种准二维床层的流体动力学，并通过固体颗粒速度和固体体积分数比较对调整后的求解器进行了验证，结果表明与实验数据吻合良好。此外，该研究还探索了不同的几何结构，包括对称和不对称折流板，以了解它们对MTO循环流化床混合特性的影响。研究结果突出了不对称折流板在增强混合行为方面的重要作用。此外，采用DIA技术研究气泡对气固混合的影响，结果表明床层的低混合区域限制了气泡直径。

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