双旋涡分级器内的颗粒群运动  

Particle group motion in a double vortex classifier

作　　者：王志远 孙占朋 杨洹迪 张开轩 姚杨 岳苏佳 WANG Zhiyuan;SUN Zhanpeng;YANG Huandi;ZHANG Kaixuan;YAO Yang;YUE Sujia(School of Mechanical Engineering,Hebei University of Science and Technology,Shijiazhuang 050018,China;Hebei Additive Manufacturing Industry Research Institute,Shijiazhuang 050018,China)

机构地区：[1]河北科技大学机械工程学院,河北石家庄050018 [2]河北省增材制造产业技术研究院,河北石家庄050018

出　　处：《中国粉体技术》2025年第3期43-55,共13页China Powder Science and Technology

基　　金：国家自然科学基金项目,编号:51904088;中央引导地方科技发展资金项目,编号:236Z1101G。

摘　　要：【目的】分析不同工况下分级器内部颗粒群运动特性,探讨发展颗粒分级技术。【方法】采用红外热成像和可见光拍照技术,对双旋涡分级器进料区和近壁区的颗粒群运动进行实验观测研究,探究不同入口气速和颗粒级配下,分级器内颗粒群的运动形貌、运动速度及温度场分布等。【结果】颗粒群从进料管进入分级器后,不同粒径段的颗粒群运动差异较大,细颗粒群(粒径为5~10μm)更快地随气流旋转加速,入口气速为14m/s时,周向运动速率达到最大值2.9m/s,远大于粗颗粒群(粒径为20~45、>45~100μm)的周向运动速率;细颗粒群在进料区下游形成明显的大尺度颗粒团,由于接近切割粒径,部分粒径为20~45μm的颗粒在进料管环形空间的停留时间明显延长;不同粒径段颗粒均在分级器近壁区形成颗粒束,进风口下方颗粒束的水平夹角为26.5°~27°,随着颗粒粒径增大,颗粒束的数量有所增加,但运动稳定性变差;入口气速对颗粒群传热的影响复杂,随着入口气速增加,粗颗粒群的温度峰值逐渐增大,而细颗粒群的温度峰值明显下降;总体上颗粒群的升温速率为200~500℃/s,降温速率为150~400℃/s。【结论】双旋涡分级器内不同粒径段颗粒运动差异明显,且入口气速对颗粒群运动稳定性影响较大。Objective Vortex technology is widely used in industries such as petrochemicals,mineral processing,and environmental protec-tion.Gas-solid two-phase vortex flow is an important component of this technology,playing a crucial role in gas-solid separa-tion and particle classification.Particle movement directly affects equipment performance,and understanding particle motion within classifiers is key to its development.This study focuses on analyzing particle group motion characteristics inside the clas-sifier under different operating conditions to advance particle grading techniques.Methods Infrared thermal imaging and visible light imaging techniques were used to observe the movement of particle groups in both the feed and near-wall areas of a double vortex classifier.The study explored the movement morphology,velocity,and tem-perature field distribution of particle groups under different inlet velocities and particle size distributions.To verify the feasibility of using infrared thermal imaging to study particle motion,preliminary experiments were conducted to capture the movement of particles falling in an open space.Preliminary results showed that the infrared thermal imaging could effectively capture the par-ticle acceleration process,with an acceleration value of about 9.5 m/s2,consistent with gravitational acceleration.This demon-strated the viability of infrared thermal imaging for studying particle motion.The infrared radiation characteristics of objects enabled real-time,efficient,and non-contact imaging of high-temperature particle groups in the classifier,providing valuable experimental data for revealing the mechanisms underlying particle classification in complex environments.Results and Discussion Accelerated by vortex flow,the distribution range of particles increased rapidly in the circumferential direction.At the same time,the particles moved centrifugally and centripetally along the radial direction,generating a greater radial temperature gradient in the thermal images.The thermal imaging area sta

关 键 词：旋流场 双涡旋分级器 颗粒群运动 热成像 

分 类 号：TQ051.8[化学工程] TB44[一般工业技术]