Deepak Kumar, Abhijit Kushari, Pramod Kumar, Hemant Mishra

Abstract:

This study examines the spray characteristics of a specially designed nozzle tailored for riser applications. Through rigorous experimental analysis, the research aims to pinpoint the optimal operational parameters for the nozzle's design. Extensive experimental evaluations are conducted to gauge the atomizing performance of a twin-fluid injector and its potential integration into contemporary FCC feed systems. The innovative twin-fluid injector incorporates an impactor bolt strategically positioned at varying distances ahead of the liquid jet to enhance mixing dynamics and atomization performance. Using water and compressed air as working fluids, droplet sizes, and velocities are precisely measured employing a phase Doppler particle analyzer. Results reveal a reduction in droplet size, as evidenced by a decrease in the Sauter Mean Diameter, attributed to the impactor bolt positioned 5 mm away from the center of the air injection orifice. Furthermore, the displacement of the spray axis, opposite the positioning of the impactor bolt, significantly influences droplet mean velocity. Droplet size diminishes with increasing mixing length, particularly in the core region, signifying improved atomization. Despite variations in slit size, both configurations exhibit a similar trend of decreasing droplet size with increasing mixing length, particularly evident in the core region, suggesting enhanced atomization. Thus, the effect of slit size on outcomes appears to be less significant compared to the impact of mixing length.

Keywords: Fluidized Catalytic Cracking, Impactor bolt, Atomization, Twin Fluid Injector, Slit Size, Mixing length.

Date Published: October 18, 2024
DOI: 10.11159/jffhmt.2024.036

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