Axial voidage profiles and identification of flow regimes in the riser of a circulating fluidized bed

Chemical Engineering Journal

Volumn 145, Issue 2, 2008, Pages 249-258

  Das, Mitali ^a   Bandyopadhyay, Amrita ^b   Meikap, B C ^a   Saha, R K ^a  

^a INDIAN INSTITUTE OF TECHNOLOGY   (India)

^b Durgapur Institute of Advanced Technology and Management   (India)

Author keywords

Acceleration length; Axial voidage; Choking velocity; Circulating fluidized bed; Fast fluidization

Indexed keywords

COAL; COLUMNS (STRUCTURAL); FLUID CATALYTIC CRACKING; FLUID DYNAMICS; FLUID MECHANICS; FLUIDIZATION; FLUIDIZED BED PROCESS; FLUIDIZED BEDS; IRON ORE TREATMENT; IRON ORES; ORE TREATMENT;

ACCELERATION LENGTH; AXIAL VOIDAGE; CHOKING VELOCITY; CIRCULATING FLUIDIZED BED; FAST FLUIDIZATION;

ORES;

EID: 53949117996     PISSN: 13858947     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.cej.2008.04.022     Document Type: Article

References (23)

1. Arastoopour H., and Gidaspow D. Analysis of IGT pneumatic conveying data and fast fluidization using a thermohydrodynamic model. Powder Technol. 22 1 (1979) 77-87
2. Das M., Meikap B.C., and Saha R.K. Dry beneficiation of iron ore and coal in a fast fluidized bed-a case study. Int. J. Chem. Sci. 5 4 (2007) 1691-1700
3. Hartge E.U., Luecke K., and Werther J. The role of mixing in the performance of CFB reactor. Chem. Eng. Sci 54 22 (1999) 5393-5407
4. Hongzhong L., Rouyu H., and Zhaolin W. Fluidizing ultrafine powders with CFB. Chem. Eng. Sci. 54 (1999) 5609-5615
5. Bi H.T., and Su P.C. Local phase holdups in gas-solid fluidization and transport. AIChE J. 9 (2001) 2025-2031
6. Li H., and Tong H. Multi-scale fluidization of ultrafine powders in a fast-bed-riser/conical-dipleg CFB loop. Chem. Eng. Sci. 59 8-9 (2004) 1897-1904
7. Santhosha E., Narsaiah T., and Rao V.V. Modelling of flow structure near the wall in circulating fluidized bed. Ind. Chem. Eng. 49 1 (2007) 38-44
8. Bai D., Jin y., and Yu Z. Flow regimes in CFB. Chem. Eng. Technol. 16 (1993) 307-313
9. Das M., Banerjee M., and Saha R.K. Segregation and mixing effects in the riser of a circulating fluidised bed. Powder Technol. 178 (2007) 179-186
10. Yerushalmi J., Cankurt N.T., and Geldart D. Flow regimes in vertical gas-solid contact systems. AIChE Symp. Ser. 176 (1978) 1-13
11. Takeuchi H., Hirama T., Chiba T., Biswas J., and Leung L.S. A quantitative definition and flow regime diagram for fast fluidization. Powder Technol. 47 (1986) 195-199
12. Bi H.T., and Grace J.R. Flow Regime diagrams for gas-solid fluidization and upward transport. Int. J. Multiphase Flow 21 6 (1995) 1229-1236
13. Llop M.F., Arnaldos J., and Casal J. Fluidization at vacuum conditions: a generalized equation for the prediction of minimum fluid velocity. Chem. Eng. Sci. 51 23 (1996) 5149-5157
14. Zijerveld R.C., Johnsson F., Marzocchella A., and Bleek V.D. Fluidisation regimes and transitions from fixed bed to dilute transport flow. Powder Technol. 95 (1998) 185-204
15. Namkung W., and Kim S. Flow regimes and axial pressure profiles in a CFB. Chem. Eng. J. 72 (1999) 245-252
16. Glass D.H., Rix S.J.L., and Yorquez-Ramirez M.I. PIV investigations of flow structures in the fluidized bed freeboard region. Powder Technol. 120 (2001) 2-11
17. Ge W., and Li J. Physical mapping of fluidization regimes-the EMMS approach. Chem. Eng. Sci. 57 18 (2002) 3993-4004
18. Monazam E.R., and Shadle L.J. A transient method for characterizing flow regimes in a circulating fluidized bed. Powder Technol. 139 (2004) 89-97
19. Kim S.W., Kirbas G., Bi H., Lim C.J., and Grace J. Flow behaviour and regime transition in a high density CFB riser. Chem. Eng. Sci. 59 (2004) 3955-3963
20. Yousfi Y., and Gau G. Aerodynamique de l'ecoulement vertical de suspensions concentrees gaz-solides-I. Regimes d'ecoulement et stabilite aerodynamique. Chem. Eng. Sci. 29 (1974) 1939-1956
21. Nakamura K., and Capes C.E. Vertical pneumatic conveying: a theoretical study of uniform and annular particle flow models. Can. J. Chem. Eng. 51 (1973) 31-38
22. Das M., Meikap B.C., and Saha R.K. Characteristics of axial and radial segregation of single and mixed particle system based on terminal settling velocity in the riser of a circulating fluidized bed. Chem. Eng. J. 145 (2008) 32-43
23. Yang W. A correlation for solid friction factor in vertical pneumatic conveying lines. AIChE J. 24 (1978) 548-552