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Characterization of dynamic behavior in the liquid spray zone of a bottom-spouted spouted fluidized bed
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DOI：10.1016/j.cjche.2026.01.025.png)
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Abstract
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The dynamic behavior and particle shape effects in the liquid spray zone were investigated through temperature standard deviation, liquid–solid contact efficiency, and electrical conductivity signals. Results indicate that temperature standard deviation increases with proximity to the nozzle. Elevated atomization gas velocity (UL) reduces droplet diameter and improves their dispersion, which leads to a more uniform temperature distribution and a resulting decrease in standard deviation. The temperature standard deviation is decreased and then increased with the increasing of fluidized gas velocity (Uf). Non-spherical particles had a higher temperature standard deviation than spherical particles. This resulted from particle agglomeration, where lower sphericity led to stronger fluctuations. The liquid–solid contact efficiency is enhanced with the increasing of spouted gas velocity (Us), UL, and Uf all. As the liquid spouted rate (QL) increased, the liquid–solid contact efficiency, determined by particle capture of droplets, first rose and then declined. Non-spherical particles exhibit higher liquid–solid contact efficiency than that of spherical particles due to longer residence times, and larger contact areas with droplets. Droplet fluctuations are intense near the nozzle, resulting in high electrical conductivity signal intensity. Increased Us enhances airflow effects, causing frequent voltage signal fluctuations. Flake-like particles accumulate more droplets due to agglomeration, enabling droplets to reach higher bed positions. These studies provide promising research directions for the development of adsorbent pelletization in CO2 capture.
Keywords:
temperature standard deviation
liquid–solid contact efficiency
particle shape effects
electrical conductivity signals
CO2 capture
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