PARTICLE GROWTH IN A CONTINUOUSLY OPERATED FLUIDIZED BED GRANULATOR
PARTICLE GROWTH IN A CONTINUOUSLY OPERATED FLUIDIZED BED GRANULATOR
复制标题
连续操作流化床造粒机中的颗粒生长
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
E. Schlünder
中科院分区：
文献类型：
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作者：
J. Zank;M. Kind;E. Schlünder
与喷雾干燥等常用干燥工艺相比，流化床喷雾造粒具有多种优势。可以在单个处理步骤中产生具有窄粒度分布的自由流动的无尘粗颗粒。特别是对于大型生产装置，需要连续操作。不幸的是，人们仍然缺乏对颗粒形成和生长机制的了解，导致规划和操作此类连续造粒机遇到困难。因此，进行实验来研究工艺参数对连续操作的流化床造粒机中生长过程的影响。此外，还开发了一个模型，考虑了喷嘴射流和流化床之间的颗粒交换以及润湿和干燥过程。喷射器内部的过程类似于湿式洗涤器进行建模。这种建模方法预测生长速率随颗粒尺寸的增加而增加。该预测与实验结果非常吻合。
Fluidized bed spray granulation offers several advantages compared to commonly used drying processes as spray drying, e.g. free flowing dust free coarse particles with a narrow particle size distribution can be produced in a single processing step. Especially for large production units a continuous operation is desirable. Unfortunately, there is still a lack of understanding concerning the mechanisms of particle formation and growth leading to difficulties in planning and operating such continuous granulators. Hence, experiments were performed to investigate the influence of process parameters on the growth process in a continuously operated fluidized bed granulator. Furthermore, a model was developed taking into consideration the particle exchange between nozzle jet and fluidized bed as well as the wetting and drying processes. The processes inside the jet are modeled in analogy to a wet scrubber. This modeling approach predicts an increase of growth rate with particle size. The prediction is in good agreement with experimental findings.