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Toward a better understanding of a Tri-Flo separator using prototyping, central composite design (CCD) and CFD simulation
International Journal of Coal Preparation and Utilization ( IF 2.1 ) Pub Date : 2020-02-06 , DOI: 10.1080/19392699.2020.1721483
Masoud Noori 1 , Reza Dehghan 1
Affiliation  

ABSTRACT

Recently, a two-stage dynamic dense medium separator, called Tri-Flo, has become more applicable for treating difficult-to-wash coals. In this study, a 70-mm diameter transparent Tri-Flo separator was manufactured using prototyping and the effects of geometrical and operating parameters were investigated. Central composite design (CCD) was used in the experimental phase. The effects of internal tubes diameter, the installation slope, and the internal flow rate on the Tri-Flo performance were analyzed. CFD simulation was also used for better understanding of the flow pattern and interpretation of the experimental results. The results indicated that the air core diameter in both stages of the separator increases with all three variables. It was also found that medium recovery to float product in rougher and cleaner stages increases with unit inclination and internal tubes diameter, while it decreases with medium flow rate. The decrease in the air core size with increasing the feed tube diameter was an outstanding finding in both experiments and simulations. On average, a 16% decrease in the air core diameter was obtained when the feed tube diameter was increased from 23 mm to 26 mm. The results of the CFD simulation showed that there is a meaningful compatibility between the experimental observations and mathematical simulations.



中文翻译:

使用原型设计、中央复合设计 (CCD) 和 CFD 模拟更好地了解 Tri-Flo 分离器

摘要

最近,称为 Tri-Flo 的两级动态重介质分离器已更适用于处理难洗煤。在这项研究中,使用原型制作了一个直径为 70 毫米的透明 Tri-Flo 分离器,并研究了几何参数和操作参数的影响。中心复合设计(CCD)用于实验阶段。分析了内管直径、安装斜度和内部流量对 Tri-Flo 性能的影响。CFD 模拟也用于更好地理解流动模式和解释实验结果。结果表明,分离器两级的空心直径随着所有三个变量的增加而增加。还发现在较粗和较清洁阶段中浮选产品的介质回收率随着单元倾斜度和内管直径的增加而增加,而随着介质流量的增加而降低。在实验和模拟中,随着进料管直径的增加,空气芯尺寸的减小是一个突出的发现。平均而言,当进料管直径从 23 毫米增加到 26 毫米时,空气芯直径减少了 16%。CFD模拟的结果表明,实验观察和数学模拟之间存在有意义的兼容性。当进料管直径从 23 毫米增加到 26 毫米时,空气芯直径减少了 16%。CFD模拟的结果表明,实验观察和数学模拟之间存在有意义的兼容性。当进料管直径从 23 毫米增加到 26 毫米时,空气芯直径减少了 16%。CFD模拟的结果表明,实验观察和数学模拟之间存在有意义的兼容性。

更新日期:2020-02-06
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