Particle agglomeration and control of gas-solid fluidized bed reactor with liquid bridge and solid bridge coupling actions
Particle agglomeration and control of gas-solid fluidized bed reactor with liquid bridge and solid bridge coupling actions
复制标题
液桥、固桥耦合作用的气固流化床反应器颗粒团聚与控制
DOI：
10.1016/j.cej.2017.07.117
复制
发表时间：
2017-12-15
影响因子：
15.1
通讯作者：
Yang, Yongrong
中科院分区：
文献类型：
--
作者：
Zhou, Yefeng;Shi, Qiang;Yang, Yongrong
具有液桥和固桥耦合作用的流化床反应器在工业上有着广泛的应用，因此研究这种流化条件下的颗粒团聚具有重要意义。本文提出了一种将电磁感应加热系统与流化床相结合的实验装置，以模拟工业聚合流化床反应器中颗粒反应放热和传热的真实的条件。研究了在不同流化气温、气速和加热功率条件下，液体含量对石蜡/石墨复合颗粒团聚行为的影响。通过对液桥和固桥耦合作用下颗粒的力平衡分析，将相对固桥力作为表征固桥力等力对团聚作用的关键参数。结果表明，由于流化过程中不同的主导团聚机理（液体蒸发和液桥），当相对固桥力在不同范围内变化时，团聚质量随液体量的增加呈现出单调增加、非单调变化和单调减少3种不同的变化趋势。研究结果表明，提出的基于相对固桥力的颗粒团聚判据可用于指导液桥固桥耦合作用下颗粒团聚的调控。(C)2017爱思唯尔B. V.保留所有权利。
Fluidized beds reactors with liquid bridge and solid bridge coupling actions have been widely used in industry and thus studies of particle agglomerations under such fluidization conditions are of great significance. This work proposed an experimental apparatus combining electro-magnetic induction heating system with fluidized bed to simulate the real conditions for particle reaction heat release and heat transfer in industrial polymerization fluidized bed reactors. The effects of liquid content on agglomeration behavior of wax/graphite composite particles under different fluidization gas temperatures, gas velocities and heating powers have been studied. Through a force balance analysis of particles with liquid bridge and solid bridge coupling actions, relative solid bridge force was taken as a key parameter to demonstrate the effects of solid bridge force and other forces on agglomerations. Results showed that as the relative solid bridge force varied in different ranges, the agglomeration mass presented three different variation trends with liquid increases, namely monotonic increasing, non-monotonic changing and monotonic decreasing, due to different dominating agglomerating mechanisms (liquid evaporation and liquid bridge) during fluidization. According to the results of this study, the proposed criterion based on relative solid bridge force can be used to guide the regulation and control of particle agglomerations in fluidization with liquid bridge and solid bridge coupling actions. (C) 2017 Elsevier B.V. All rights reserved.