颗粒聚团是流化床气相聚合反应器中典型的介尺度结构，其形成演化规律一直都是研究热点。本申请创新性地使用电磁感应加热具有核壳结构的聚乙烯/铁粉复合微球并控制发热速率，利用聚乙烯受热易粘结的特性，模拟流化床聚合反应的颗粒团聚结块过程，快速固化捕捉颗粒聚团。进而采用核磁、拉曼、扫描电镜等技术对颗粒聚团进行断层扫描和结构分析，根据切面形态、孔隙率和结晶度分布，获得颗粒聚团结构的全谱图。结合声发射技术在线检测颗粒聚团尺寸和“颗粒聚团温度”，研究颗粒聚团的形成演化规律和调控机制，期望建立颗粒聚团众体平衡模型，阐明流场和传递协同作用下的颗粒聚团调控机制，实现颗粒聚团的定向调控，有效指导流化床气相聚合反应器的放大设计和安全运行。

Particle agglomerations are typical meso-scale structures in gas phase fluidized bed polymerization reactors. Its formation and evolvement law is always regarded as a research hot spot. This project proposes to use novel experimental apparatus and methods, electromagnetic induction heating system and polyethylene/iron composite microsphere particles with a core-shell structure. Making use of the highly cohesive feature of PE particles at high temperatures to simulate the agglomeration process for fluidized bed polymerization, and controlling the heating rate, the particles will melt quickly and thus the agglomeration structure can be captured. Various measurement methods are used to analyze the agglomeration structures. For example, Nuclear Magnetic Resonance, Raman Spectrum and Scanning Electron Microscope techniques are used for tomoscan analysis of the cross-sectional morphology, distribution of the voidage and crystallinity, in order to obtain the full spectrum graphs of agglomerations. Moreover, acoustic emission technique is used to detect the particle agglomeration size and particle agglomeration temperature so as to study the formation and evolvement law, as well as the control mechanism. The project expects to establish particle agglomeration population balance model, clarify particle agglomeration regulation and control mechanism under synergistic actions between flow field and transport process. All these work will help to realize the directional regulation and control for the particle agglomerations and further give guidelines for scale-up design and operation security of gas phase fluidized bed polymerization reactors.