Abstract
Effective gas dispersion and liquid mixing are significant parameters in the design of an inert-particle spouted-bed reactor (IPSBR) system. Solid particles can be used to ensure good mixing and an efficient rate of mass and heat transfer between the gas and liquid. In this study, computational fluid dynamics (CFD) coupled with the discrete phase model (DPM) were developed to investigate the effect of the feed gas velocity (0.5–1.5 m/s), orifice diameter (0.001–0.005 m), gas head (0.15–0.35 m), particle diameter (0.009–0.0225 m), and mixing-particle-to-reactor-volume fraction (2.0–10.0 vol.%) on the solid mass concentration, average solid velocity, and average solid volume fraction in the upper, middle, and conical regions of the reactor. Statistical analysis was performed using a second-order response surface methodology (RSM) with central composite design (CCD) to obtain the optimal operating conditions. Selected parameters were optimized to maximize the responses in the middle and upper regions, and minimize them in the conical region. Such conditions produced a high interfacial area and fewer dead zones owing to good particle dispersion. The optimal process variables were feed gas velocity of 1.5 m/s, orifice diameter of 0.001 m, gas head of 0.2025 m, a particle diameter of 0.01 m, and a particle load of 0.02 kg. The minimum average air velocity and maximum air volume fraction were observed under the same operating conditions. This confirmed the novelty of the reactor, which could work at a high feed gas velocity while maintaining a high residence time and gas volume fraction.
Highlights
Spouted beds have several advantages and potential applications compared to moving beds
The results were observed at a constant orifice diameter of 0.003 m, gas head of 0.25 m, mixing particle diameter of 0.0135 m, and total mass of mixing particles of 0.06 kg
It is clear from the figures that the effect of a feed gas velocity of 1.5 m/s had a significant effect on the average solid velocity distribution in the middle region and reached a maximum value of
Summary
Spouted beds have several advantages and potential applications compared to moving beds They can handle granular particles with a wide size distribution range, provide an efficient mixing between the solid and gas phases and significant rates of heat and mass transfer [1,2,3,4,5,6,7,8]. El-Naas et al [10,11] developed and investigated a novel IPSBR to deal with both CO2 capture and reject brine management. Their results indicated that the CO2 capture efficiency reached up to 97.7% at a gas-to-liquid volume ratio of 123.
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