Investigating Agglomeration Behaviors in High Temperature Gas-Solid Fluidized Beds with Liquid Injection
Investigating Agglomeration Behaviors in High Temperature Gas-Solid Fluidized Beds with Liquid Injection
复制标题
研究液体喷射高温气固流化床中的团聚行为
DOI：
10.1021/acs.iecr.8b00311
复制
发表时间：
2018
影响因子：
4.2
通讯作者：
Yang Yongrong
中科院分区：
文献类型：
--
作者：
Shi Qiang;Li Shaoshuo;Tian Sihang;Huang Zhengliang;Yang Yao;Liao Zuwei;Sun Jingyuan;Wang Jingdai;Yang Yongrong
设计了一种模拟工业烯烃聚合流化床中颗粒放热过程的液体喷射感应加热流化床。通过对团聚体尺寸和质量的表征，研究了液体注入流量对团聚行为的影响。根据床层压降、轴向温度分布和微观可视化实验数据，提出了团聚机理。结果表明，随着液体注入流量的增加，团聚机理分别由固桥力、液桥力以及二者的协同作用控制。湿团聚体由液桥力引起的局部死区，为热点的发生和固体桥的生长提供了良好的环境，从而形成固体团聚体。此外，提高喷液位置和增大感应加热功率可以拓宽流化床反应器喷液流量的操作范围。
An induction heating fluidized bed with liquid injection was designed to mimic the exothermic process of particles in industrial olefin polymerization fluidized beds. The effects of liquid injection flow rate on agglomeration behaviors were investigated through the characterization of agglomerate size and mass. Agglomeration mechanisms were proposed based on the experimental data of bed pressure drop, axial temperature distribution, and microscale visualization. Results have revealed that, with the increase of liquid injection flow rate, the agglomeration mechanism was controlled by the solid bridge force, the liquid bridge force, and the cooperative action of them, respectively. Wet agglomerates caused by the liquid bridge force induced local dead zones and provided a good environment for the occurrence of a hot spot and growth of solid bridge, and thus the formation of solid agglomerates. Besides, elevating the liquid injection position and increasing the induction heating power can widen the operation range of the liquid injection flow rate for fluidized bed reactors.