A model for the spray zone in early-stage fluidized bed granulation
A model for the spray zone in early-stage fluidized bed granulation
复制标题
早期流化床造粒喷雾区模型
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
A. Hoffmann
中科院分区：
文献类型：
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作者：
S. Schaafsma;P. Vonk;N. Kossen;A. Hoffmann
对使用已知且均匀的液滴尺寸的顶喷流化床造粒工艺的喷雾区中颗粒的形成进行了实验和理论研究。实验结果表明球形颗粒的多峰尺寸分布。提出了一个模型来解释这一点，该模型基于核的形成，以及这些核中的一些与床的喷雾区域中的液滴或其他核的快速聚结。该模型基于伯努利过程，并预测 n 个液滴所贡献的颗粒的数量频率。模型预测通过颗粒尺寸分布的实验结果进行了验证，并且通过与团聚状示踪颗粒的 PEPT 跟踪进行比较，使模型预测和实验结果一致所需的喷雾区域中的核停留时间在物理上是合理的。
The formation of granules in the spray zone of a top-spray ∞uid-bed granulation process using a known and uniform drop size is studied experimentally and theoretically. Experimental results indicate a multimodal size distribution of spherically-shaped granules. A model is presented to explain this based on the formation of nuclei, and the rapid coalescence of some of these nuclei with droplets or other nuclei in the spray zone of the bed. The model is based on a Bernoulli process and predicts the number frequency of granules to which n droplets have contributed. The model predictions are validated with experimental results for granule size distribution, and the nucleus residence time in the spray zone required to bring model predictions and experimental results into line is shown to be physically plausible by comparing with PEPT tracking of an agglomerate-like tracer particle.