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Description
Adsorption-based CO₂ capture requires not only highly selective adsorbents, but also an efficient gas–solid contacting configuration that ensures sufficient gas residence time, effective adsorbent utilization, stable particle circulation, and enhanced heat transfer. In this work, CO₂ adsorption was investigated in a draft-tube spout-fluid bed with a hydraulic barrier. This configuration was designed to provide spatial separation between the adsorption zone and particle transport. A CO₂-containing stream was introduced into the annulus as the aeration gas, while a separate air stream was introduced at the bottom of the hydraulic barrier as the spouting gas. In the annulus, particles move downward as a moving packed bed, while the draft tube provides upward particle transport and circulation. The hydraulic barrier suppressed aeration gas bypass into the draft tube and confined adsorption to the annulus. Previous hydrodynamic investigations of this system enabled the selection of suitable geometric and operating conditions characterized by stable particle circulation, low minimum spouting gas flow rate, reduced pressure drop, and favourable gas distribution1. In this study, the influence of inlet CO₂ concentration and gas flow rates on the breakthrough behaviour was first investigated using zeolites 13X and 5A as adsorbents. Adsorption experiments were then performed under selected optimal hydrodynamic conditions. Outlet CO₂ concentration and bed temperature were measured to determine breakthrough and saturation times, temperature response, and adsorption capacity. The results show that the investigated system can be considered a hybrid gas-solid contactor, combining the favourable contact characteristics of a moving packed bed with the process flexibility of circulating particle systems. Therefore, it represents a promising platform for CO₂ capture and future adsorption-regeneration integration.
Keywords: spout-fluid bed, CO2 adsorption, breakthrough curves, zeolites.
References:
(1) Šućurović, K.; Jaćimovski, D.; Brzić, D; Đuriš, M.; Arsenijević, Z.; Kaluđerović Radoičić, T.; Bošković Vragolović, N. Pressure drop and fluid flow distribution in a modified spout-fluid bed with a draft tube and hydraulic barrier. Chemical Engineering Communications 2026, 1-18. https://doi.org/10.1080/00986445.2026.2654151