Abstract The gas-solid dynamic behaviors in FCC feed injection zone are investigated by analyzing the solids holdup fluctuation signals. Four different phases are found during the mixing between jet and particles, i.e., the cluster phase, the denser dispersed particulate phase, the diluter dispersed particulate phase and the gas phase (without particles). The clusters in the feed jets-solids mixing zone are identified by combining wavelet decomposition with sensitivity analysis method. The time fractions of different phases in the upward and downward feed injection schemes are calculated to show the effects of different types of injections. Results show that the time fractions of cluster phase and gas phase are quite high in the feed influence zone of upward injection scheme. While low cluster and gas time fractions as well as high dispersed particulate time fraction are obtained when the injections are downward.

中文翻译：

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FCC 进料注入区进料射流和催化剂颗粒的动力学行为

摘要 通过对含固率波动信号的分析，研究了FCC进料注入区的气固动力学行为。在射流与颗粒混合过程中发现四种不同的相，即簇相、较致密的分散颗粒相、较稀的分散颗粒相和气相（无颗粒）。结合小波分解和灵敏度分析方法识别进料射流-固体混合区中的簇。计算向上和向下进料注入方案中不同阶段的时间分数，以显示不同类型注入的影响。结果表明，在向上注入方案的进料影响区中，簇相和气相的时间分数相当高。