Precision mist injection strategy for enhanced hydrodynamic stability in oscillating bubbling fluidized beds

摘要

This study investigates precision mist injection into a cuboidal pseudo-2D fluidized bed on a robotic sea wave simulator to stabilize bubbling and homogenize hydrodynamics under 9° inclination and 0.1 Hz rolling motion. Digital image analysis and particle image velocimetry are used to evaluate the effects of mist injection on defluidization, void fraction, particle motion, and fluidization regime changes. Liquid injection effectively reduces bubble and slug sizes and controls particle velocities without causing defluidization/agglomeration. Symmetric injection is ineffective in inclined beds and does not significantly reduce slug size in rolling beds, but does reduce bubble size. Asymmetric injection consistently performs better, especially in rolling conditions, by reducing bubble size and velocity and reducing slugging. Double point injection proves to be the most reliable and significantly reduces bed maldistribution in rolling configurations. These results suggest potential offshore applications, where mist-induced surface changes reduce sensitivity to sea-like motion. • Precise liquid injection reduces bubble and slug size, and particle velocity. • Non-targeted mist injection is to be avoided for inclined beds. • Targeted injection outperforms non-targeted option for curbing slug control. • Successful reduction of slugs in rolling fluidized bed is achieved.