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CFD–DEM simulation of fine particles in a spouted bed apparatus with a wurster tube

Particuology 2019年第1期17卷 114-125页

作者： Paul Breuninger Dominik Weis Isabell Behrendt Philipp Grohn Fabian Krull Sergiy Antonyuk Institute of Particle Process Engineering University of KaiserslauternGottlieb Daimler Str.. KaiserslauternGermany

In this work, a coupled computational fluid dynamics–discrete element method (CFD–DEM) approach was employed to evaluate the spouting behavior of fine, cohesive powders in a cylindrical spouted bed with a conical base and equipped with a wurster tube. The particle and gas dynamics inside the apparatus were simulated with 1.7 million spherical ZrO2 particles with a particle size of 100 μm. For an accurate prediction of the interactions of cohesive particles in the spouted bed, the adhesion forces according to JKR theory were included in the Hertz–Tsuji contact model. The surface energy of the particles was varied over a wide range to determine the effect of the adhesion on the spouting (the fountain shape and maximum height as well as the distribution of the concentrations and velocities of particles in different zones of the apparatus). A detailed analysis of the collision dynamics was conducted. The spouting behavior of a spouted bed with the same dimensions, particles, and processing parameters was recorded with a high-speed camera. The CFD–DEM simulations showed good agreement with the experimentally captured spouting behavior.

关键词： CFD–DEM Spouted bed wurster tube Cohesive powder

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wurster 流化床内颗粒流动特性实验研究

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工程热物理学报 2017年第3期38卷 548-552页

作者：车汉桥吴蒙叶佳敏王海刚中国科学院工程热物理研究所北京100190 中国科学院大学北京100049

为研究wurster流化床内颗粒流动规律,本文利用12-4-8组合电极电容层析成像(Electrical Capacitance Tomography,ECT)传感器对wurster流化床冷态实验和加湿实验过程进行监测,得到了ECT重构图像以及颗粒浓度时变曲线。首先,根据冷态实验... 详细信息

为研究wurster流化床内颗粒流动规律,本文利用12-4-8组合电极电容层析成像(Electrical Capacitance Tomography,ECT)传感器对wurster流化床冷态实验和加湿实验过程进行监测,得到了ECT重构图像以及颗粒浓度时变曲线。首先,根据冷态实验数据比较了不同操作条件下流化床内颗粒流态和浓度波动特性;在此基础上,通过加湿实验数据分析了包衣液流率对于颗粒流动的影响。本文研究表明,ECT传感器适用于wurster流化床过程关键参数在线测量和故障诊断,从而为反应过程的优化提供支持。

关键词： wurster 流化床电容层析成像颗粒浓度

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Particle electrification in an apparatus with a draft tube operating in a fast circulating dilute spout-fluid bed regime

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Particuology 2019年第1期17卷 146-153页

作者： Wojciech Ludwig Wroclaw University of Science and Technology Faculty of Chemistry. Department of Chemical EngineeringNorwida 4/650-373 WroclawPoland

The intensity of the electrostatic charge accumulated during the flow of Cellets^■ particles in a modified wurster apparatus is investigated in terms of the bed mass, and the initial moisture and velocity of the spouting gas. Particle electrification is proportional to the increase in the velocity of the spouting gas, which is connected with a higher velocity of the cores and the strength of their impact on the walls of the device. The presence of moisture in the bed facilitates electrification, but does not affect circulation, since moisture simultaneously lowers the bed resistance and reduces the relaxation time of particles, leading to rapid discharging if brought into contact with the conducting elements of the apparatus. Therefore, with regard to classic dry-powder coating, the velocity of the spouting gas should be minimized to ensure good circulation, with the particle moisture held at the maximum level admissible for a given product. The investigations show that a unique construction of the apparatus, which brings about an intense natural electrification of the cores, makes it suitable for the electrostatic dry-coating process by means of a high-voltage feeder with the controlled charging of coating powder in the spray nozzle.

关键词： Electrification Electrostatic charge Spout-fluid bed wurster apparatus

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