原煤立式辊磨回路流场和颗粒运动特性的数值研究

IF 4.9 2区 工程技术 Q1 ENGINEERING, CHEMICAL Minerals Engineering Pub Date : 2024-09-21 DOI:10.1016/j.mineng.2024.108997
Hailiang Hu , Yiming Li , Yunlong Lu , Yunlong Li , Guiqiu Song , Xuejun Wang
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引用次数: 0

摘要

为了改善立式辊磨机(VRM)中颗粒的运动特性,提出了螺旋导叶的不同结构会影响 VRM 内部流场的假设。分析了 VRM 中流体速度和涡度的分布,研究了影响颗粒运动和分离性能的机理。研究以 MMLM2550(由中国江苏大环集团提供,磨削台直径为 2550 毫米)VRM 为研究对象,通过增加螺旋导向叶片对其结构进行了改进。结果表明,随着叶片宽度的增加,气流轨迹和涡度分布得到改善,有利于颗粒的输送。然而,改变叶片的厚度对 VRM 的内部物理场和颗粒运动特性影响不大。因此,我们忽略了叶片厚度对这些因素的影响。随着螺旋导向叶片转数的增加,螺旋导向叶片的方向与颗粒的运动轨迹保持一致,更有利于颗粒从 VRM 中排出。螺旋导向叶片的高度对流场和颗粒运动特性有很大影响。叶片高度越小,初级分离区的回流越大,颗粒的不规则循环运动越强,从而增加了颗粒的运动时间和运动距离。随着叶片数量的增加,流道内气流速度加快,颗粒随气流高速运动,同时运动时间有效缩短。该研究为改进 VRM 结构提供了有价值的指导,并为表征颗粒的运动特性和增强 VRM 的内部流场提供了参考。
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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Numerical Study of Flow Field and Particle Motion Characteristics on Raw Coal Vertical Roller Mill Circuits

In order to improve the motion characteristics of particles in vertical roller mills (VRMs), the assumption that different structures of helical guide blades affect the internal flow field of the VRMs was put forward. The distributions of fluid velocity and vorticity in VRMs were analyzed, and the mechanism affecting the motion of particles and the separation performance was studied. The study took the MMLM2550 (supplied by Jiangsu Dahuan Group, China; grinding table diameter of 2550 mm) VRM as the research object, whose structure was improved by adding helical guide blades. The results showed that, with the increase in the width of blade, the air flow trajectory and the distribution of vorticity improved, which was conducive to the transport of particles. However, changing the thickness of the blade had little effect on the internal physical field of the VRM and particle motion characteristics. Therefore, the influence of blade’s thickness on these factors was ignored. With the increase in the number of helical guide blade turns, the direction of the helical guide blade remained consistent with the trajectory of the movement of particles, making it more conducive to the discharge of particles from the VRM. The height of the helical guide blade had a great influence on the flow field and the particle motion characteristics. The smaller the blade height, the greater the reflux in the primary separation zone, and stronger the irregular circulatory motion of particles, thus increasing the movement time and the distance of particles. With the increase in the number of blades, the airflow speed increased in the flow channel, so that the particles moved with the airflow at high speed, while the movement time was effectively shortened. The study provides valuable guidance for the improvement of VRM structures, and serves as a reference for characterizing the motion of particles and enhancing the internal flow field in VRMs.

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来源期刊
Minerals Engineering
Minerals Engineering 工程技术-工程:化工
CiteScore
8.70
自引率
18.80%
发文量
519
审稿时长
81 days
期刊介绍: The purpose of the journal is to provide for the rapid publication of topical papers featuring the latest developments in the allied fields of mineral processing and extractive metallurgy. Its wide ranging coverage of research and practical (operating) topics includes physical separation methods, such as comminution, flotation concentration and dewatering, chemical methods such as bio-, hydro-, and electro-metallurgy, analytical techniques, process control, simulation and instrumentation, and mineralogical aspects of processing. Environmental issues, particularly those pertaining to sustainable development, will also be strongly covered.
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