기체 유동층에서 입자 비산속도 상관식에 의한 수송속도의 예측 = Predicting the Transport Velocity by the Correlation on Particle Entrainment Rate in the Gas Fluidized-bed

국문 초록 (Abstract)

기체 유동층에서 입자비산속도에 관한 상관식을 사용하여 입자의 수송속도를 예측하는 모델을 제안하였다. Choi 등과 Li와 Kato의 상관식을 사용하여 emptying time 방법을 모사하였다. 기체속도의 단위에 의한 영향을 배제하기 위해서, 기체속도를 종말속도로 나눈 무차원 속도를 x-축의 값으로 사용하였다. y-축은 입자비산속도의 역수를 사용하였다. 기체속도를 증가시킬 때, y-값의 감소 기울기가 절대값으로 0.398 [$m^2s/kg$]를 나타내는 무차원 속도를 수송속도로 간주하였다. 모델의 예측값은 고온, 고압에서도 측정값과 비교적 잘 일치하였다.

다국어 초록 (Multilingual Abstract)

A model for predicting the transport velocity was proposed using the correlation of the particle entrainment rate in the gas fluidized bed. The emptying time method was simulated using correlations of Choi et al. and Li and Kato. In order to exclude the influence of the unit of the gas velocity, the dimensionless velocity obtained by dividing the gas velocity by the terminal velocity was used as the value of the x-axis. The inverse of the particle entrainment rate was used as the value of the y-axis. When increasing the gas velocity, the non-dimensional velocity, at which the decreasing slope of the y-value is 0.398 [$m^2s/kg$] in absolute value, was considered as the transport velocity. The transport velocity predicted by the model was in good agreement even at high temperature and high pressure.

참고문헌 (Reference)

1 Adanez, J., "Transport Velocities of Coal and Sand Particles" 77 (77): 61-68, 1993

2 Balasubramanian, N., "Transition Velocities in the Riser of a Circluating Fluidized Bed" 16 (16): 247-260, 2005

3 Lee, G. S., "The Vertical Pneumatic Transport of Cement Raw Meal" 20 (20): 207-216, 1982

4 Seo, M. W., "The Transition Velocities in a Dual Circulating Fluidized Bed Reactor with Variation of Temperatures" 264 : 583-591, 2014

5 Ishii, H., "The Flow Structures of a Circulating Fluidized Bed" 2 (2): 25-36, 1991

6 Hirama, T., "Regime Classification of Macroscopic Gas-Solid Flow in a Circulating Fluidized Bed Riser" 70 (70): 215-222, 1992

7 Horio, M., "On the Nature of Turbulent and Fast Fluidized Beds" 70 (70): 229-236, 1992

8 Ryu, H. -J., "Minimum Fluidization Velocity and Transition Velocity to Fast Fluidization of Oxygen Carrier Particle for Chemical-Looping Combustor" 41 (41): 624-631, 2003

9 Du, B., "Imaging the Choking Transition in Gas-Solid Risers Using Electrical Capacitance Tomography" 45 (45): 5384-5395, 2006

10 Chesonis, D. C., "Hydrodynamics and Mixing of Solids in a Recirculating Fluidized Bed" 29 (29): 1785-1792, 1990

11 Shin, B. C., "Hydrodynamics and Coal Combustion Characteristics of Circulating Fluidized Beds" 22 (22): 253-258, 1984

12 Han, G. Y., "Hydrodynamic Characteristics of a Circulating Fluidized Bed" 2 (2): 141-147, 1985

13 Smolders, K., "Gas Fluidized Beds Operating at High Velocities: a Critical Review of Occurring Regimes" 119 (119): 269-291, 2001

14 Yerushalmi, J., "Further Studies of the Regimes of Fluidization" 24 (24): 187-205, 1979

15 Li, Y., "Fluidization" Plenum Press 537-544, 1980

16 Namkung, W., "Flow Regimes and Axial Pressure Profiles in a Circulating Fluidized Bed" 72 (72): 245-252, 1999

17 Bi, H. T., "Flow Regime Diagrams for Gas-Solid Fluidization and Upward Transport" 21 (21): 1229-1236, 1995

18 Bi, H. T., "Existence of Turbulent Regime in Gas-Solid Fluidization" 38 (38): 297-301, 1992

19 Chehbouni, A., "Effets de Differents Parametres sur les Vitesses de Transition de la Fluidisation en Regime Turbulent" 73 (73): 41-50, 1995

20 Muhammad Shahzad Khurram, "Effects of angle on the transport velocity in an inclined fluidized-bed" Springer Nature 32 (32): 2542-2549, 2015

21 Bae, D. -H., "Effect of Temperature on Transition Velocity from Turbulent Fluidization to Fast Fluidization in a Gas Fluidized Bed" 39 (39): 456-464, 2001

22 JUNGHWAN KIM, "Effect of Pressure on Minimum Fluidization Velocity and Transition Velocity to Fast Fluidization of Oxygen Carrier for Chemical Looping Combustor" The Korean Hydrogen and New Energy Society 28 (28): 85-91, 2017

23 Ma, X. X., "Effect of Interparticle Adhesion Forces on Elutriation of Fine Powders from a Fluidized Bed of a Binary Particle Mixture" 95 (95): 93-101, 1998

24 Choi, J. H., "Correlation on the Particle Entrainment Rate in Gas Fluidized Beds" 38 (38): 2491-2496, 1999

25 Perales, J. F., "Circulating Fluidized Bed Technology III" Pergamon Press 73-78, 1991

26 Avidan, A. A., "Bed Expansion in High Velocity Fluidization" 32 (32): 223-232, 1982

27 Wen, C. Y., "A Generalized Method for Predicting the Minimum Fluidization Velocity" 12 (12): 610-612, 1966

28 Li, J., "A Correlation of Elutriation Rate Constant for Adhesion Particles (Group C Particles)" 118 (118): 209-218, 2001