Analysis of the residence time distribution in rotary kilns and the effect of particle sizes

IF 4.3 2区材料科学 Q2 ENGINEERING, CHEMICAL

Particuology Pub Date : 2025-05-29 DOI:10.1016/j.partic.2025.05.016

Haozhi Jie , Fabian Herz , Xiaoyan Liu

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引用次数: 0

Abstract

In this study, a mathematical model based on the segregation-induced ring-core structure was developed to predict the residence time and axial velocity of particles of different sizes within a rotary kiln. Validation experiments were conducted using a pilot-scale rotary kiln with bidisperse particle systems comprising particle sizes of 0.7 mm, 2 mm, and 4 mm. The entire process was recorded using video analysis, which enabled the tracking of tracer particle movement from the inlet to the outlet. Based on the recorded data, the average axial velocity for each particle size across different kiln regions was determined. At the outlet, the tracer particles were analyzed using statistical methods and diffusion theory, allowing for the calculation of the residence time distribution (RTD), mean residence time (MRT), variance, axial dispersion coefficient (D_z), and Peclet number (Pe). The experimentally obtained MRT exhibited strong agreement with the predictions of the mathematical ring-core structure model, confirming its accuracy and reliability. Additionally, the influence of particle size and mixing behavior was systematically evaluated by varying particle size ratios and mass concentrations.

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回转窑停留时间分布及粒度影响分析

本文建立了基于偏析诱导的环芯结构的数学模型，用于预测不同粒径颗粒在回转窑内的停留时间和轴向速度。验证实验在中试回转窑上进行，采用双分散颗粒系统，包括粒径为0.7 mm， 2mm和4mm。整个过程使用视频分析进行记录，从而可以跟踪示踪剂颗粒从入口到出口的运动。根据记录的数据，确定了不同窑区不同粒度的平均轴向速度。在出口处，利用统计方法和扩散理论对示踪粒子进行分析，计算停留时间分布（RTD）、平均停留时间（MRT）、方差、轴向弥散系数（Dz）和佩莱特数（Pe）。实验得到的磁电阻率与数学环核结构模型的预测结果吻合较好，证实了模型的准确性和可靠性。此外，通过不同的粒径比和质量浓度，系统地评估了粒径和混合行为的影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Particuology 工程技术-材料科学：综合

CiteScore

6.70

自引率

2.90%

发文量

1730

审稿时长

32 days

期刊介绍： The word ‘particuology’ was coined to parallel the discipline for the science and technology of particles. Particuology is an interdisciplinary journal that publishes frontier research articles and critical reviews on the discovery, formulation and engineering of particulate materials, processes and systems. It especially welcomes contributions utilising advanced theoretical, modelling and measurement methods to enable the discovery and creation of new particulate materials, and the manufacturing of functional particulate-based products, such as sensors. Papers are handled by Thematic Editors who oversee contributions from specific subject fields. These fields are classified into: Particle Synthesis and Modification; Particle Characterization and Measurement; Granular Systems and Bulk Solids Technology; Fluidization and Particle-Fluid Systems; Aerosols; and Applications of Particle Technology. Key topics concerning the creation and processing of particulates include: -Modelling and simulation of particle formation, collective behaviour of particles and systems for particle production over a broad spectrum of length scales -Mining of experimental data for particle synthesis and surface properties to facilitate the creation of new materials and processes -Particle design and preparation including controlled response and sensing functionalities in formation, delivery systems and biological systems, etc. -Experimental and computational methods for visualization and analysis of particulate system. These topics are broadly relevant to the production of materials, pharmaceuticals and food, and to the conversion of energy resources to fuels and protection of the environment.