Experimental studies of air-blast atomization on the CO2 capture with aqueous alkali solutions

doi:10.1016/j.cjche.2019.01.021

Abstract

Abstract: In this work, an air-blast atomizing column was used to study the CO₂ capture performance with aqueous MEA (mono-ethanol-amine) and NaOH solutions. The effects of gas flow rate, the liquid to gas ratio (L/G), the CO₂ concentration on the CO₂ removal efficiency (η) and the volumetric overall mass transfer coefficient (K_Ga_v) were investigated. The air-blast atomizing column was also compared with the pressure spray tower on the studies of the CO₂ capture performance. For the aqueous MEA and NaOH solutions, the experimental results show that the η decreases with increasing gas flow rate and CO₂ concentration while it increases with increasing L/G. The effects on K_Ga_v are more complicated than those for η. When the CO₂ concentration is low (3 vol%), K_Ga_v increases with increasing gas flow rate while decreases with increasing L/G. However, when the CO₂ concentration is high (9.5 vol%), as the gas flow rate and L/G increases, K_Ga_v increases first and then decreases. The aqueous MEA solution achieves higher η and K_Ga_v than the aqueous NaOH solution. The air-blast atomizing column shows a good performance on CO₂ capture.

Key words: Air-blast atomizer, CO₂ capture, Aqueous alkali solutions

摘要： In this work, an air-blast atomizing column was used to study the CO₂ capture performance with aqueous MEA (mono-ethanol-amine) and NaOH solutions. The effects of gas flow rate, the liquid to gas ratio (L/G), the CO₂ concentration on the CO₂ removal efficiency (η) and the volumetric overall mass transfer coefficient (K_Ga_v) were investigated. The air-blast atomizing column was also compared with the pressure spray tower on the studies of the CO₂ capture performance. For the aqueous MEA and NaOH solutions, the experimental results show that the η decreases with increasing gas flow rate and CO₂ concentration while it increases with increasing L/G. The effects on K_Ga_v are more complicated than those for η. When the CO₂ concentration is low (3 vol%), K_Ga_v increases with increasing gas flow rate while decreases with increasing L/G. However, when the CO₂ concentration is high (9.5 vol%), as the gas flow rate and L/G increases, K_Ga_v increases first and then decreases. The aqueous MEA solution achieves higher η and K_Ga_v than the aqueous NaOH solution. The air-blast atomizing column shows a good performance on CO₂ capture.

关键词: Air-blast atomizer, CO₂ capture, Aqueous alkali solutions

Zheng Li, Xiaoyan Ji, Zhuhong Yang, Xiaohua Lu. Experimental studies of air-blast atomization on the CO₂ capture with aqueous alkali solutions[J]. Chinese Journal of Chemical Engineering, 2019, 27(10): 2390-2396.

Zheng Li, Xiaoyan Ji, Zhuhong Yang, Xiaohua Lu. Experimental studies of air-blast atomization on the CO₂ capture with aqueous alkali solutions[J]. 中国化学工程学报, 2019, 27(10): 2390-2396.

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Experimental studies of air-blast atomization on the CO₂ capture with aqueous alkali solutions

Experimental studies of air-blast atomization on the CO₂ capture with aqueous alkali solutions

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