Title: Experimental and numerical simulation of the deposition characteristics of NH₄Cl particles in 90° elbow

Authors: Xinyu Liu; Jianxun Quan; Xiaofei Liu; Haozhe Jin; Guofu Ou

Addresses: Key Laboratory of Fluid Transmission Technology of Zhejiang Province, Institute of Flow-Induced Corrosion, Zhejiang Sci-Tech University, Hangzhou, Zhejiang, 310018, China ' Shanghai Institute of Applied Mathematics and Mechanics, Shanghai Key Laboratory of Mechanics in Energy Engineering, School of Mechanics and Engineering Science, Shanghai University, Shanghai, 200072, China ' Institute of Flow-Induced Corrosion, Faculty of Mechanical Engineering and Automation, Zhejiang Sci-Tech University, Hangzhou, Zhejiang, 310018, China ' Institute of Flow-Induced Corrosion, Faculty of Mechanical Engineering and Automation, Zhejiang Sci-Tech University, Hangzhou, Zhejiang, 310018, China ' Institute of Flow-Induced Corrosion and Intelligent Prevention and Control, Changzhou University, Changzhou, Jiangsu, 213000, China

Abstract: The deposition of NH₄Cl particles in the equipment can cause potential safety hazards in petrochemical enterprises. In this study, a gas-solid-flow experimental equipment has been built to explore the characteristics of NH₄Cl deposition with different humidity and fluid velocity. The results show that: the gas flow rate, relative humidity (RH), and duration have little influence on the deposition position of NH₄Cl particles, but they affect the deposition amount of NH₄Cl particles greatly; due to the formation of liquid droplets and the influence of secondary flow in the elbow, the deposition increases rapidly in the range of 45°-75° and reaches 0.57 g at 67.5°. After evaluating the experiment, a computational fluid dynamics (CFDs) coupled with DEM method is employed to analyse the flow parameters of particles. Numerical results of particle deposition show a good agreement with the corresponding experimental data. [Received: February 25, 2022; Accepted: July 6, 2022]

Keywords: gas-solid flow; particles deposit; NH₄Cl; CFD-DEM coupling.

DOI: 10.1504/IJOGCT.2023.128051

International Journal of Oil, Gas and Coal Technology, 2023 Vol.32 No.2, pp.141 - 156

Received: 24 Feb 2022
Accepted: 06 Jul 2022
Published online: 04 Jan 2023 *

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