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Systematic approach to determination of optimum gas-phase mass transfer rate for high-gravity carbonation process of steelmaking slags in a rotating packed bed

Author

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  • Pan, Shu-Yuan
  • Eleazar, Elisa G.
  • Chang, E-E
  • Lin, Yi-Pin
  • Kim, Hyunook
  • Chiang, Pen-Chi

Abstract

In order to reduce CO2 emissions and waste generation from the steelmaking industry, a high-gravity carbonation process via rotating packed bed (RPB) was developed using cold-rolling mill wastewater (CRW) and basic oxygen furnace slag (BOFS). Since mass transfer among phases is believed to be a key to effective carbonation for CO2 fixation, in this study, a mass transfer model for the high-gravity carbonation process was developed based on two-film theory. The mass transfer characteristics including overall gas-phase mass transfer coefficient (KGa) and height of a transfer unit (HTU) were determined accordingly. The results indicated that the mass transfer resistance of carbonation using BOFS/CRW in an RPB was mainly lay on the liquid side. In addition, the effect of key operating variables such as rotating speed, slurry flow rate, gas flow rate, and liquid-to-solid (L/S) ratio on mass transfer characteristics was evaluated. The developed model was validated with the experimental data, where the experimental KGa values lay within ±20% of the values estimated. Based on the obtained results, empirical models of KGa and HTU values were established. Furthermore, response surface methodology (RSM) was applied to optimize the high-gravity carbonation process from the viewpoint of mass transfer characteristics. The obtained RSM results were in fairly good agreement with the results of the developed model based on the two-film theory. Based on the theoretical models and statistical analyses, the optimum gas-phase mass transfer rate for high-gravity carbonation process of steelmaking slags in an RPB was graphically determined.

Suggested Citation

  • Pan, Shu-Yuan & Eleazar, Elisa G. & Chang, E-E & Lin, Yi-Pin & Kim, Hyunook & Chiang, Pen-Chi, 2015. "Systematic approach to determination of optimum gas-phase mass transfer rate for high-gravity carbonation process of steelmaking slags in a rotating packed bed," Applied Energy, Elsevier, vol. 148(C), pages 23-31.
    • Handle: RePEc:eee:appene:v:148:y:2015:i:c:p:23-31
    DOI: 10.1016/j.apenergy.2015.03.047
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    References listed on IDEAS

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    1. Pan, Shu-Yuan & Chiang, Pen-Chi & Chen, Yi-Hung & Tan, Chung-Sung & Chang, E.-E., 2014. "Kinetics of carbonation reaction of basic oxygen furnace slags in a rotating packed bed using the surface coverage model: Maximization of carbonation conversion," Applied Energy, Elsevier, vol. 113(C), pages 267-276.
    2. Zhao, Bingtao & Su, Yaxin & Tao, Wenwen, 2014. "Mass transfer performance of CO2 capture in rotating packed bed: Dimensionless modeling and intelligent prediction," Applied Energy, Elsevier, vol. 136(C), pages 132-142.
    3. Teir, Sebastian & Eloneva, Sanni & Fogelholm, Carl-Johan & Zevenhoven, Ron, 2009. "Fixation of carbon dioxide by producing hydromagnesite from serpentinite," Applied Energy, Elsevier, vol. 86(2), pages 214-218, February.
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    Cited by:

    1. Ming-Sheng Ko & Tong-Bou Chang & Cho-Yu Lee & Jhong-Wei Huang & Chin-Fong Lim, 2021. "Optimization of Cyclone-Type Rotary Kiln Reactor for Carbonation of BOF Slag," Sustainability, MDPI, vol. 13(20), pages 1-11, October.
    2. Pan, Shu-Yuan & Lorente Lafuente, Ana Maria & Chiang, Pen-Chi, 2016. "Engineering, environmental and economic performance evaluation of high-gravity carbonation process for carbon capture and utilization," Applied Energy, Elsevier, vol. 170(C), pages 269-277.
    3. Ren, Shan & Aldahri, Tahani & Liu, Weizao & Liang, Bin, 2021. "CO2 mineral sequestration by using blast furnace slag: From batch to continuous experiments," Energy, Elsevier, vol. 214(C).

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