SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2024, Vol. 67 ›› Issue (3): 228-237.DOI: 10.1016/j.cjche.2023.11.010

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Visual experimental study of nanofluids application to promote CO2 absorption in a bubble column

Shangyuan Cheng, Guisheng Qi, Yuliang Li, Yixuan Yang   

  1. Shanxi Province Key Laboratory of Higee-Oriented Chemical Engineering, North University of China, Taiyuan 030051, China
  • 收稿日期:2023-08-06 修回日期:2023-11-21 出版日期:2024-03-28 发布日期:2024-06-01
  • 通讯作者: Shangyuan Cheng,E-mail address:zbdxcsy@nuc.edu.cn.
  • 基金资助:
    The authors wish to express their thanks to the financial support from National Natural Science Foundation of China (22108263), Shanxi Province Basic Research Program Project (20210302124060) and the 18th Graduate Student Technology Project of North University of China (20221824).

Visual experimental study of nanofluids application to promote CO2 absorption in a bubble column

Shangyuan Cheng, Guisheng Qi, Yuliang Li, Yixuan Yang   

  1. Shanxi Province Key Laboratory of Higee-Oriented Chemical Engineering, North University of China, Taiyuan 030051, China
  • Received:2023-08-06 Revised:2023-11-21 Online:2024-03-28 Published:2024-06-01
  • Contact: Shangyuan Cheng,E-mail address:zbdxcsy@nuc.edu.cn.
  • Supported by:
    The authors wish to express their thanks to the financial support from National Natural Science Foundation of China (22108263), Shanxi Province Basic Research Program Project (20210302124060) and the 18th Graduate Student Technology Project of North University of China (20221824).

摘要: The addition of dispersed-phase nanoparticles in the liquid phase can enhance the gas-liquid transfer process as the suspended nanoparticles affect the transfer process inside the fluid through microdisturbance or micro-convection effects. In this article, a high-speed digital camera was used to visualize the bubble behavior of CO2 in pure water and nanofluids to examine the effects of CO2 gas flow rate, nanoparticle solid content and type on the bubble behavior in the fluids. The CO2 absorption performance in three water-based nanofluids were compared in a bubbler. And the mass transfer characteristics during CO2 bubble absorption and the reasons for the enhanced gas-liquid mass transfer effect of nanoparticles were analyzed. The results showed that the presence of nanoparticles affected the formation process of bubbles in the fluid, shortened the bubble detachment time, reduced the detachment diameter, effectively increased the gas-liquid contact area, and improved the bubbles detachment frequency. The system with MCM-41 corresponded to a higher overall mass transfer coefficient. Uncalined MCM-41 contained surfactant that enhanced foaming behavior in water. This prevented the transfer of CO2 to some extent, and the CO2 absorption by uncalined MCM-41/H2O was 5.34% higher than that by pure water. Compared with SiO2 nanoparticles with the same particle size and the same composition, MCM-41 had a higher adsorption capacity and better hydrophilicity due to its larger specific surface area and rich porous structure, which was more favorable to accelerate the collision between nanoparticles and CO2 bubbles to cause micro-convection. Under the condition of≥0.1% (mass) solid content, the enhancement of CO2 absorption process by MCM-41 nanoparticles was more significant and improved by 16.9% compared with pure water.

关键词: Nanofluids, CO2 absorption, Mass transfer, MCM-41, Bubble column

Abstract: The addition of dispersed-phase nanoparticles in the liquid phase can enhance the gas-liquid transfer process as the suspended nanoparticles affect the transfer process inside the fluid through microdisturbance or micro-convection effects. In this article, a high-speed digital camera was used to visualize the bubble behavior of CO2 in pure water and nanofluids to examine the effects of CO2 gas flow rate, nanoparticle solid content and type on the bubble behavior in the fluids. The CO2 absorption performance in three water-based nanofluids were compared in a bubbler. And the mass transfer characteristics during CO2 bubble absorption and the reasons for the enhanced gas-liquid mass transfer effect of nanoparticles were analyzed. The results showed that the presence of nanoparticles affected the formation process of bubbles in the fluid, shortened the bubble detachment time, reduced the detachment diameter, effectively increased the gas-liquid contact area, and improved the bubbles detachment frequency. The system with MCM-41 corresponded to a higher overall mass transfer coefficient. Uncalined MCM-41 contained surfactant that enhanced foaming behavior in water. This prevented the transfer of CO2 to some extent, and the CO2 absorption by uncalined MCM-41/H2O was 5.34% higher than that by pure water. Compared with SiO2 nanoparticles with the same particle size and the same composition, MCM-41 had a higher adsorption capacity and better hydrophilicity due to its larger specific surface area and rich porous structure, which was more favorable to accelerate the collision between nanoparticles and CO2 bubbles to cause micro-convection. Under the condition of≥0.1% (mass) solid content, the enhancement of CO2 absorption process by MCM-41 nanoparticles was more significant and improved by 16.9% compared with pure water.

Key words: Nanofluids, CO2 absorption, Mass transfer, MCM-41, Bubble column