화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
HWAHAK KONGHAK, Vol.39, No.5, 579-589, October, 2001
Export Citation
기체유동층에서 슬러그 특성 - 1. 최소슬러깅속도와 슬러그 빈도
Slug Characteristics in Gas Fluidized Beds; 1. Minimum Slugging Velocity and Slug Frequency
류호정, 최정후1, †, 김상돈2, 손재익
  • 한국에너지기술연구원, 대전 305-343
  • 1건국대학교 화학공학과, 서울 143-701
  • 2한국과학기술원 화학공학과 및 에너지환경연구센터, 대전 305-701
Ho-Jung Ryu, Jeong-Hoo Choi1, †, Sang-Done Kim2, and Jae-Ek Son
  • Korea Institute of Energy Research, Daejeon 305-343, Korea
  • 1Department of Chemical Engineering, Konkuk University, Seoul 143-701, Korea
  • 2Department of Chemical Engineering and Energy & Environment Research Center, KAIST, Daejeon 305-701, Korea
E-mail:
초록
기체유동층에서 슬러그 특성에 미치는 유속, 측정높이, 최소유동화상태의 층높이, 층직경, 입자특성의 영향을 고찰하기 위해 2개의 유동층(유동층 A: 내경 0.055m, 높이 2.0m, 유동층 B: 내경 0.1m, 높이 2.5m)에서 층물질로 모래(평균입경 0.286 mm)와 FCC(A: 평균입경 0.082 mm, B: 0.091 mm)를 사용하여 유속, 측정높이, 최소유동화상태의 층높이, 층직경 및 입자특성의 변화에 따른 슬러그 특성을 측정하였다. 측정된 최소슬러깅속도는 측정높이가 증가함에 따라 감소하였으며 최소유동화상태의 층높이와 측직경이 증가함에 따라 증가하였다. 최소슬러깅속도에 대한 입자특성의 영향은 층직경에 따라 다르게 나타났다. 층직경이 작은 경우에는 모래입자의 최소슬러깅속도가 FCC에 비해 크게 나타났으나 층직경이 큰 경우에는 FCC의 최소슬러깅속도가 모래에 비해 크게 나타났다. 슬러그 빈도는 유속이 증가함에 따라 감소하였으나 유속이 증가함에 따라 감소 경향이 둔화되었으며 측정높이와 최소유동화상태의 층높이가 증가함에 따라 감소하였고 층직경이 증가함에 따라 증가하였다. 슬러그 빈도에 미치는 측정높이의 영향은 최소유동화상태의 층높이가 증가함에 따라 감소하였다. 주어진 과잉기체유속에서 FCC입자의 슬러그 빈도가 모래 입자에 비해 크게 나타났다.
In order to understand the slugging regime comprehensively, the characteristics of slugging have been studied experimentally in gas fluidized beds. The onset velocity of slugging and the properties of slug were measured in gas fluidized beds(bed A: 0.055 m i.d., 2.0 m height, bed B: 0.1 m i.d. and 2.5 m height) using sand(specific surface mean diameter: 0.286 mm) and FCC(FCC A, specific surface mean diameter: 0.082 mm, FCC B, specific surface mean diameter: 0.091 mm) as bed materials with variations of gas velocity, height from the distributor plate, bed height at minimum fluidization, column diameter and particle properties. The minimum slugging velocity decreased with increasing height from the distributor plate, however, increased with increasing bed height at minimum fluidization and column diameter. However, the effect of particle properties was found to be dependent on the column diameter. The minimum slugging velocity of sand was higher than that of FCC in the column of 0.055 m inside diameter, however, that of FCC higher than that of sand in the column of 0.10 m inside diameter. The slug frequency decreased with increasing gas velocity, height from the distributor plate and bed height at minimum fluidization, however, increased with column diameter. The effect of gas velocity on slug frequency diminished as gas velocity increased. The effect of height from the distributor plate on slug properties decreased as the bed height at minimum fluidization increased. The slug frequency of FCC was higher than that of sand at the same excess gas velocity.
Keywords:Gas-Solid Fluidization;Minimum Slugging Velocity;Slug Frequency
  1. Kunii D, Levenspiel O, "Fluidization Engineering," 2nd ed., Butterworth-Heinemann, Boston (1991)
  2. Noordergraaf IW, Van Dijk A, Van Den Bleek CM, Powder Technol., 52, 59 (1987) 
  3. Shichun C, Heling Z, Feichen J, in "Fluidization," Kwauk M. and Kunii D., eds., Elsevier, Amsterdam, 75 (1985)
  4. Ryu HJ, Choi JH, Yi CK, Shun DW, Son JE, Kim SD, HWAHAK KONGHAK, 37(3), 472 (1999)
  5. Choi JH, Son JE, Kim SD, Ind. Eng. Chem. Res., 37(6), 2559 (1998) 
  6. Geldart D, "Gas Fluidization Technology," John Wiley and Sons, Chichester (1986)
  7. Baeyens J, Geldart D, Chem. Eng. Sci., 29, 255 (1974) 
  8. Verloop J, Heertjes PM, Chem. Eng. Sci., 29, 1035 (1974) 
  9. De Luca L, Di Felice R, Foscolo PU, Powder Technol., 69, 171 (1992) 
  10. Lee SH, Master Thesis, Korea Advanced Institute of Science and Technology, Taejeon, Korea (1997)
  11. Nakamura K, Masaaki GHH, Katsuhiko H, Kag. Kog. Ronbunshu, 2(6), 577 (1976)
  12. Satija S, Fan LS, AIChE J., 31, 1554 (1985) 
  13. Dimattia DG, Amyotte PR, Hamdullahpur F, Can. J. Chem. Eng., 75(2), 452 (1997)
  14. Baker CGJ, Geldart D, Powder Technol., 19, 177 (1978) 
  15. Thiel WJ, Potter OE, Ind. Eng. Chem. Fundam., 16, 242 (1977) 
  16. Ryu HJ, Choi JH, Kim SD, Son JE, Shun DW, Yi CK, HWAHAK KONGHAK, 37(2), 178 (1999)
  17. Cranfield RR, Geldart D, Chem. Eng. Sci., 29, 935 (1974) 
  18. Ho TH, Yutani N, Fan LT, Walawender WP, Powder Technol., 35, 249 (1983) 
  19. Leva M, Weintraub M, Grummer M, Pollchik M, Storch HH, U.S. Bureau Mines Bull., 504 (1951)
  20. Stewart PSB, Davidson JF, Powder Technol., 1, 61 (1967) 
  21. Broadhurst TE, Becker HA, AIChE J., 21(2), 238 (1975) 
  22. Agarwal PK, 2nd Int. Symp. on Gas-Solid Flows, Atlanta, May 12-16, 1 (1986)
  23. Lee GS, Kim SD, Korean J. Chem. Eng., 6(1), 15 (1989)
  24. Fatah N, Flamant G, "Fluidization and Fluid Particle Systems," Casal J. and Arnaldos J., eds., Universitat Politecnica de Cataluya, Spain, 103 (1990)