高密度颗粒流化行为测量的磁性颗粒示踪方法  

Magnetic particle tracing method for measuring fluidization behavior of high-density particles

作　　者：蒋琳 张同旺 刘荣正[1] 邵友林[1] 刘兵[1] 刘马林[1] JIANG Lin;ZHANG Tongwang;LIU Rongzheng;SHAO Youin;LIU Bing;LIU Main(Institute of Nuclear and New Energy Technology,Tsinghua University,Beijing 100084,China;Sinopec Petrochemical Scientific Research Institute Co.,Beijing 100083,China)

机构地区：[1]清华大学核能与新能源技术研究院,北京100084 [2]中石化石油化工科学研究院有限公司,北京100083

出　　处：《化工学报》2024年第12期4453-4467,共15页CIESC Journal

基　　金：国家万人计划青年拔尖人才项目(20224723061);国家科技重大专项(ZX06901)。

摘　　要：提出采用磁性示踪颗粒和磁阻传感器构建颗粒示踪测量系统,系统研究了磁性颗粒示踪实验系统的组成、测量原理、误差分析及影响因素,并指出其优缺点和适用范围。研究发现在地球磁场和颗粒磁场耦合环境下,磁性颗粒和传感器系统依然具有较好的示踪效果。基于磁场感应定律建立颗粒空间位置搜索算法,可以获得颗粒运动轨迹,并获取单颗粒运行方向、运动速率、循环频率等流化参数。磁场测量受影响因素较多,未来还需要高磁性材料的研发以及测量器件敏感度的提高。通过对喷动流化床内环隙区高密度示踪颗粒运动循环时间的测量和分析,证明了测量方法的可靠性。该研究有助于后续包覆过程放大中流化床反应器的设计及优化,是高密度颗粒流化床包覆技术值得进行的研究方向。A particle tracing measurement system is proposed using magnetic tracer particles and magnetoresistance sensor.The composition,measurement principle,error analysis and influencing factors of the magnetic particle tracing experimental system are systematically studied,and its advantages,disadvantages and application range are summarized.It was found that magnetic particles and sensor systems still have good tracking effects,in the coupled environment of the earths magnetic field and particle magnetic field.Based on the magnetic field induction law,a particle spatial position search algorithm can be established to measure the particle motion trajectory and obtain the fluidization parameters such as the flow direction,movement rate,and circulation frequency of a single particle.However,the magnetic field measurement is affected by many factors,and the development of highly magnetic materials and the improvement of measurement sensor sensitivity are still needed in the future.By measuring and analyzing the circulating rate of the tracer particles in the annular zone in the spouted fluidized bed,the reliability of this method has been demonstrated.This study is helpful for the design and optimization of fluidized bed reactors in the subsequent preparation process,and is a worthy research direction for high-density particle fluidized bed coating technology.

关 键 词：流态化 两相流 高密度颗粒 测量 磁场强度 运动轨迹 

分 类 号：TQ021.1[化学工程]