Pressure fluctuation analysis has been used to identify different flow regimes in spouted beds. Although this is a promising cost-effective tool for process control and design purposes, it has hardly been used in spouted beds operating with fine and irregular particles. Therefore, the aim of this paper is to apply pressure fluctuation analysis to spouted beds operating with fine and irregular particles, either without tube or equipped with draft tube. The minimum spouting velocities estimated by the spectral analysis in systems without tubes differ from those obtained based on the characteristic curves in the range from 10.60% (sand) to 3.50% (glass beads). Thus, the main novelty of this study lies in the application of pressure fluctuation and spectral analyses in spouted beds operating with fine and irregular particles by considering the influence of the internal devices. Therefore, the methodology proposed based on both hydrodynamic and spectral analyses is a feasible and promising alternative for delimiting the minimum spouting velocity and stable operating conditions in industrial processes, especially when the aim is process control and scaling up.

压力波动分析已用于确定喷动床中的不同流动方式。尽管这是用于过程控制和设计目的的一种有前途的成本效益工具，但它几乎没有用于带有细小和不规则颗粒的喷射床中。因此，本文的目的是将压力波动分析应用到不带管子或装有引流管的细小和不规则颗粒的喷动床上。在没有管的系统中，通过光谱分析估计的最小喷出速度与根据特性曲线获得的最小喷出速度在10.60％（砂）至3.50％（玻璃珠）之间。从而，这项研究的主要新颖之处在于考虑了内部设备的影响，压力波动和频谱分析在带有细颗粒和不规则颗粒的喷动床中的应用。因此，基于流体动力学和频谱分析的方法是确定工业过程中最小喷水速度和稳定运行条件的可行且有希望的替代方法，特别是在过程控制和规模扩大时。