This work seeks to improve CO2 absorption efficiency in packed bed columns by substituting amine-based solvents with sodium hydroxide and implementing gas phase pulsation to enhance mass transfer coefficients. Experimental analysis and computational fluid dynamics modeling were employed to investigate the impact of pulsation on absorption efficiency under various conditions. Essential parameters comprised superficial liquid velocity (1.2–4.6 cm/s), pulsation frequency (0–10 Hz), amplitude (0–20 mm), and NaOH concentration (0.25 N to 2 N), while maintaining a constant superficial gas velocity of 120 cm/s and a solute gas concentration of 13 %. Three packing materials—glass spheres, ceramic Raschig rings, and ceramic Pall rings—were evaluated. The results demonstrated that ceramic Pall rings exhibited the greatest efficiency. Pulsation, namely at 9.06 Hz and 20 mm amplitude, enhanced the volumetric mass transfer coefficient by as much as 4.53 times for Pall rings. Increased column diameters (from 7.00 cm to 11.5 cm) enhanced performance. The findings show advancement of more efficient CO2 absorption (by switching from chemical absorption using amine based solvents to classical chemical absorption using aqueous NaOH solution) for industrial applications, aiding climate change mitigation initiatives.

中文翻译：

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填充床中 CO2 吸收的多方法研究：气相脉动的理论、实验和 CFD 观点


本研究旨在通过用氢氧化钠代替胺基溶剂并实施气相脉动来提高传质系数，从而提高填充床塔中的 CO2 吸收效率。采用实验分析和计算流体动力学建模来研究脉动对各种条件下吸收效率的影响。基本参数包括表面液体速度 （1.2-4.6 cm/s）、脉动频率 （0-10 Hz）、振幅 （0-20 mm） 和 NaOH 浓度（0.25 N 至 2 N），同时保持 120 cm/s 的恒定表面气体速度和 13% 的溶质气体浓度。评估了三种填料 — 玻璃球、陶瓷 Raschig 环和陶瓷 Pall 环。结果表明，陶瓷颇尔环表现出最高的效率。脉动，即 9.06 Hz 和 20 mm 振幅，使颇尔环的体积传质系数提高了 4.53 倍。增加色谱柱直径（从 7.00 cm 增加到 11.5 cm）增强了性能。研究结果表明，工业应用中更有效的 CO2 吸收（通过使用胺基溶剂的化学吸收转变为使用 NaOH 水溶液的经典化学吸收）取得了进展，有助于缓解气候变化的举措。