Heat Transfer Model and Energy Dissipation Rate in Bubble Columns with Continuous Operation

연속조작 기포탑에서 열전달 모델 및 에너지 소멸 속도

  • Jang, Ji Hwa (School of Chemical Engineering, Chungnam National University) ;
  • Seo, Myung Jae (School of Chemical Engineering, Chungnam National University) ;
  • Lim, Dae Ho (School of Chemical Engineering, Chungnam National University) ;
  • Kang, Yong (School of Chemical Engineering, Chungnam National University) ;
  • Jung, Heon (Synfuel Research Group, KIER) ;
  • Lee, Ho Tae (Synfuel Research Group, KIER)
  • 장지화 (충남대학교 화학공학과) ;
  • 서명재 (충남대학교 화학공학과) ;
  • 임대호 (충남대학교 화학공학과) ;
  • 강용 (충남대학교 화학공학과) ;
  • 정헌 (한국에너지기술연구원 합성연료센터) ;
  • 이호태 (한국에너지기술연구원 합성연료센터)
  • Received : 2009.07.13
  • Accepted : 2009.08.21
  • Published : 2009.10.31

Abstract

Heat transfer model and energy dissipation rate were investigated to examine the heat transfer mechanism in bubble columns with continuous operation. The energy dissipation rate($E_D$) obtained from the unsteady state heat transfer model based on the surface renewal theory was significantly small, comparing with the hydrodynamic energy dissipation rate($P_v$) calculated from the overall hydrodynamic energy balance based on the behaviors and holdups of gas and liquid phases in the column. It was found from these results that the energy dissipation rate based on the surface renewal theory is independent of the hydrodynamic energy dissipation rate obtained from the overall hydrodynamic energy balance in the bubble column, in considering their mechanism. The different two energy dissipation rates were correlated in terms of operating variables within this experimental conditions, respectively.

Acknowledgement

Supported by : 한국에너지기술연구원

References

  1. Deckwer, W. D., Bubble Column Reactors, John Wiley & Sons, Chichester, England(1992)
  2. Fan, L. S., Gas-Liquid-Solid Fluidization Engineering, Butterworths, Boston(1989)
  3. Son, S. M., Kang, S. H., Lee, C. G., Jung, S. H., Kang, Y. and Kim, S. D., 'Characteristics of Bubble Flow Behavior in a Gas- Liquid Countercurrent Bubble Column Bioreactor,' Korean Chem. Eng. Res., 43, 272-277(2005)
  4. Kang, Y., Lee, K. I., Shin, I. S., Son, S. M., Kim, S. D. and Jung, H., 'Characteristics of Hydrodynamics, Heat and Mass Transfer in Three-phase Inverse Fluidized beds,' Korean Chem Eng. Res., 46, 451-464(2008)
  5. Deckwer, W. D., "On the Mechanism of Heat Transfer in Bubble Column Reactors," Chem. Eng. Sci., 35, 1341-1346(1980) https://doi.org/10.1016/0009-2509(80)85127-X
  6. Suh, I. S., Jin, G. T. and Kim, S. D., "Heat Transfer Coefficients in Three-Phase Fluidized Beds," Int. J. Multiphase Flow., 11, 255- 259(1985) https://doi.org/10.1016/0301-9322(85)90049-7
  7. Suh, I. S. and Deckwer, W. D., "Unified Correlation of Heat Transfer Coefficients in Three-Phase Fluidized Beds," Chem. Eng. Sci., 44, 1455-1458(1989) https://doi.org/10.1016/0009-2509(89)85019-5
  8. Lewis, D. A., Field, R. W., Xavier, A. M. and Edwards, D., 'Heat Transfer in Bubble Columns,' Trans. IChemE., 60, 40-47 (1982)
  9. Kang, Y. and Kim, S. D., 'On the Heat Transfer Mechanism in Three Phase Fluidized Beds,' KJChE., 5, 154-163(1988) https://doi.org/10.1007/BF02697670
  10. Cho, Y. J., Kim, S. J., Nam, S. J., Kang, Y. and Kim, S. D., "Heat Transfer and Bubble Properties in Three-Phase Circulating Fluidized Beds," Chem. Eng. Sci., 56, 6107-6115(2001) https://doi.org/10.1016/S0009-2509(01)00256-1
  11. Kang, Y., Fan, L. T. and Kim, S. D., "Immersed Heater-to-Bed Heat Transfer in Liquid-Solid Fluidized Beds," AIChE J., 37, 1101-1106(1991) https://doi.org/10.1002/aic.690370715
  12. Verma, A. K., "Heat Transfer Mechanism in Bubble Columns," Chem. Eng. J., 42, 205-208(1989) https://doi.org/10.1016/0300-9467(89)80088-7
  13. Ouyoung, P. K., Chisti, M. Y. and Moo-Young, M., 'Heat Transfer in Airlift Reactors,' Chem. Eng. Res. Des., 67, 451-456(1989)
  14. Kang, S. H., Son, S. M., Kim, U. Y., Kang, Y., Cho, Y. J. and Kang, H. K., 'Heat Transfer Resistances in Three-Phase Circulating Fluidized Beds,' J. Ind. End. Chem., 13, 33-39(2007)
  15. Son, S. M., Lee, K. I., Kang, S. H., Kang, Y. and Kim, S. D., “"Heat Transfer Coefficient in Viscous Three-Phase Inverse Fluidized Beds,”" AIChE J., 53, 3011-3016(2007) https://doi.org/10.1002/aic.11310
  16. Cho, Y. J., Woo, K. J., Kang, Y. and Kim, S. D., "Dynamic Characteristics of Heat Transfer Coefficient in Pressurized Bubble Columns with Viscous Liquid Medium," Chem. Eng. Processing., 41, 699-706(2002) https://doi.org/10.1016/S0255-2701(02)00002-8
  17. Kim, S. D., Kang, Y. and Kwon, H. K., "Heat Transfer Characteristics in Two-Phase and Three-Phase Slurry-Fluidized Beds," AIChE J., 32, 1397-1400(1986) https://doi.org/10.1002/aic.690320820