고분자 입자를 사용하는 순환유동층에서의 유동 안정성 연구

김상현; 한귀영

HWAHAK KONGHAK, Vol.37, No.2, 191-197, April, 1999

Export Citation

고분자 입자를 사용하는 순환유동층에서의 유동 안정성 연구

Flow Stability of Circulating Fluidized Bed with Polymeric Particles

김상현, 한귀영

초록

고분자 입자를 사용하는 순환유동층에서 유동 안정성을 압력요동으로부터 살펴보았다. 실험에 사용된 순환유동층은 직경이 5cm, 높이는 250cm 였으며, 사용된 고분자는 크기가 0.5 mm인 PE와 0.1 mm PVC였으며, 유동 안정성을 향상시키기 위해 사용된 큰 입자는 0.7mm 모래와 2.0mm 유리알이었다. 순환유동층에서 측정된 압력요동 신호는 표준편차, 확률밀도함수로서 해석하였다. 큰 입자의 첨가 그리고 기체의 습도가 유동 흐름에 미치는 영향을 압력요동의 변화에서 살펴보았다. 실험결과 유동층 하부가 상부보다 압력요동이 심하였다. 또한 큰 입자의 첨가 그리고 습한 공기를 사용할 때, 압력요동이 작아졌으며, 이로써 유동 안정성이 향상됨을 알 수 있었다.

The flow stability of circulating fluidized bed with polymeric particles was investigated from the pressure drop fluctuation. The test facility was 5 cm I.D. x 250cm long and the PE and PVC were employed as the bed materials. The pressure drop fluctuations of the CFB was analysed in terms of standard deviation, probability density function. The effect of addition of coarse particle and relative humidity of fluidized gas on the flow stability was determined from change of pressure drop fluctuations. Axial profiles of pressure drop fluctuation were measured and results showed that at the lower part of the bed the pressure drop fluctuation was more severe. It also showed that the addition of coarse particles and humid fluidized gas prevented the particle agglomeration thus the narrower pressure drop fluctuation was observed.

Keywords:Circulating Fluidized Bed;Flow Stability;Pressure Fluctuation

[References]

Han GY, Choi JH, Chem. Ind. Technol., 13(1), 20 (1995)
Squires AM, in "Circulating Fluidized Bed Technology," edited by Basu, P., Pergamon Press, Toronto, 1 (1986)
Reh L, Chem. Eng. Prog., 67(2), 58 (1971)
Yerushalmi J, Cankurt NT, Powder Technol., 24, 187 (1979)
Wolny A, Opalinski I, J. Electrostatics, 14, 279 (1983)
Baster DF, Roberts AW, Powder Technol., 43, 11 (1985)
Li H, Legros R, Brereton CMH, Grace JR, Chaouki J, Powder Technol., 60, 121 (1990)
Bi H, Jiang P, Jean RH, Fan LS, Chem. Eng. Sci., 47, 3113 (1992)
Wolny A, Kazmierczak W, Chem. Eng. Sci., 44, 2607 (1989)
Jiang P, Zhang J, Fan LS, in "Circulating Fluidized Bed Technology V," edited by Kwauk, H. and Li J., Science Press, Beijing, 188 (1997)
Jiang PJ, Bi HT, Liang SC, Fan LS, AIChE J., 40(2), 193 (1994)
Krupp H, Adv. Colloid Interface Sci., 1, 111 (1967)
Molerus O, Powder Technol., 33, 81 (1987)
Smeltzer EE, Weaver ML, Klinzing GE, Ind. Eng. Chem. Process Des. Dev., 21, 390 (1982)
Chang H, Louge M, Powder Technol., 70, 259 (1992)
Bi J, Yang G, Kojima T, Trans. IChemE, 73, 162 (1995)

[Referenced By]

[1] Han GY, Choi JH, Chem. Ind. Technol., 13(1), 20 (1995)

[2] Squires AM, in "Circulating Fluidized Bed Technology," edited by Basu, P., Pergamon Press, Toronto, 1 (1986)

[3] Reh L, Chem. Eng. Prog., 67(2), 58 (1971)

[4] Yerushalmi J, Cankurt NT, Powder Technol., 24, 187 (1979)

[5] Wolny A, Opalinski I, J. Electrostatics, 14, 279 (1983)

[6] Baster DF, Roberts AW, Powder Technol., 43, 11 (1985)

[7] Li H, Legros R, Brereton CMH, Grace JR, Chaouki J, Powder Technol., 60, 121 (1990)

[8] Bi H, Jiang P, Jean RH, Fan LS, Chem. Eng. Sci., 47, 3113 (1992)

[9] Wolny A, Kazmierczak W, Chem. Eng. Sci., 44, 2607 (1989)

[10] Jiang P, Zhang J, Fan LS, in "Circulating Fluidized Bed Technology V," edited by Kwauk, H. and Li J., Science Press, Beijing, 188 (1997)

[11] Jiang PJ, Bi HT, Liang SC, Fan LS, AIChE J., 40(2), 193 (1994)

[12] Krupp H, Adv. Colloid Interface Sci., 1, 111 (1967)

[13] Molerus O, Powder Technol., 33, 81 (1987)

[14] Smeltzer EE, Weaver ML, Klinzing GE, Ind. Eng. Chem. Process Des. Dev., 21, 390 (1982)

[15] Chang H, Louge M, Powder Technol., 70, 259 (1992)

[16] Bi J, Yang G, Kojima T, Trans. IChemE, 73, 162 (1995)