Gas and Liquid Flow Characteristics in an Internal Circulation Airlift Reactor using a Single Nozzle -Effects of Flow Zone Sizes-

단일노즐을 사용한 내부순환 공기리프트 반응기에서 기체 및 액체의 유동특성 - 유동지역의 크기영향 -

  • Jang, Sea-Il (Department of Chemical Engineering, Myongji University) ;
  • Kim, Jong-Chul (Department of Chemical Engineering, Myongji University) ;
  • Jang, Young-Joon (Department of Chemical Engineering, Myongji University) ;
  • Son, Min-Il (Department of Chemical Engineering, Myongji University) ;
  • Kim, Tae-Ok (Department of Chemical Engineering, Myongji University)
  • 장서일 (명지대학교 공과대학 화학공학과) ;
  • 김종철 (명지대학교 공과대학 화학공학과) ;
  • 장영준 (명지대학교 공과대학 화학공학과) ;
  • 손민일 (명지대학교 공과대학 화학공학과) ;
  • 김태옥 (명지대학교 공과대학 화학공학과)
  • Received : 1995.05.18
  • Accepted : 1998.07.16
  • Published : 1998.11.10

Abstract

Gas and liquid flow characteristics were investigated in an internal circulation airlift reactor using a single nozzle for a gas distributor. In three reactors with different diameters of the downcomer and heights of the riser, the gas holdup in the individual flow zone and the impulseresponse curve of tracer for an air-water system were measured for various gas velocities and reactor heights. Experimental results showed that the flow behavior of bubbles in the riser was the slug flow due to strong coalescences of bubbles and that the bubble flow pattern in the downcomer was the transition bubble flow for the smaller diameter of the downcomer, however, it was the homogeneous bubble flow for the larger one. And mean gas holdups in the individual flow zone and the reactor were greatly increased with decreasing the diameter of the downcomer for the equal ratio of height of the top section to that of the riser. Also, the mixing time was much effected by the height of the top section of reactor and for the equal ratio of height of top section to that of the riser, it was increased with increasing the diameter of the downcomer and the height of the riser. Flow characteristics of liquid were mainly varied with the bubble flow pattern in the downcomer and the size of the top section of reactor. And circulation velocities of liquid in the riser were increased with increasing gas velocities and the size of the top section of reactor, and for the equal ratio of height of top section to that of the riser, they were increased with increasing the diameter of the downcomer and the height of the riser.

References

  1. Biotechnol. & Bioeng. v.55 P. Gikas;A. G. Livingston
  2. Biotechnol. & Bioeng. v.36 T. Keshavarz;R. Eglin;E. Walker;C. Bucke;G. Holt;A. T. Bull;M. D. Lilly
  3. Airlift Bioreactors M. Y. Chisti
  4. Chem. Eng. Sci. v.52 J. J. Heijnen;J. Hols;R. G. J. M. van der Lans;H. L. J. M. van Leeuwen;A. Mulder;R. Weltevrede
  5. Chem. Eng. Sci. v.47 M. H. Siegel;C. W. Robinson
  6. Can. J. Chem. Eng. v.71 W. R. Kessler;W. K. Popovic;C. W. Robinson
  7. Biotechnol. & Bioeng. v.23 J. L. Malfait;D. J. Wilcox;D. G. Mercer;L. D. Barker
  8. Biotechnol. & Bioeng. v.32 M. H. Siegel;J. C. Merchuk
  9. Chem. Eng. Sci. v.45 J. C. Merchuk;R. Yunger
  10. Can. J. Chem. Eng. v.69 M. H. Siegel;J. C. Merchuk
  11. AIChE J. v.32 M. H. Siegel;J. C. Merchuk;K. Schugerl
  12. 화학공학 v.31 한승완;최일곤;윤영웅;김상렬
  13. Chem. Eng. Sci. v.40 A. G. Jones
  14. Biotechnol. & Bioeng. v.32 M. Popovic;C. W. Robinson
  15. Biotechnol. & Bioeng. v.43 A. B. Russell;C. R. Thomas;M. D. Lilly
  16. Chem. Eng. Sci. v.41 J. C. Merchuk
  17. 공업화학 v.8 김종철;장서일;손민일;김태옥
  18. AIChE J. v.28 Y. T. Shah;B. G. Kelkar;S. P. Godbole
  19. Encyclopedia of Fluid Mechanics v.3 Flow Patterns in Bubble Columns K. Viswanathan;N. P. Cheremisinoff(ed.)
  20. Biotechnol. & Bioeng. v.27 R. A. Bello;C. W. Robinson;M. Moo-Young
  21. Biotechnol. & Bioeng. Symp. no.4 M. Chakravarty;S. Begum;H. D. Singh;M. S. Iyengar
  22. AIChE J. v.40 J. C. Merchuk
  23. Chem. Eng. J. v.38 M. Y. Chisti;M. Moo-Young
  24. Chem. Eng. Sci. v.38 P R. Fields;N. K. H. Slater
  25. Ind. Eng. Chem. Res. v.33 B. Obradovic;A. Dudukovic;G. Vunjak-Novakovic
  26. Can. J. Chem. Eng. v.62 R A. Bello;C. W. Robinson;M. Moo-Young
  27. Proceedings of the 34th Canadian Chemical Engineering Conference Estimation of Some Important Design Parameters for Non-Newtonian Liquids in Pneumatically Agitated Fermenters M. Popovic;C. W. Robinson
  28. MASc Thesis, University of Waterloo Hydrodynamic and Mass Transfer Characteristics of an Airlift Contactor D. H. El-Gabbani