Loop-seal Operation of Iron Ore Particles in Pneumatic Conveying

Won Namkung; Minyoung Cho

Korean Journal of Chemical Engineering, Vol.19, No.6, 1066-1071, November, 2002

DOI10.1007/BF02707234 Export Citation

Loop-seal Operation of Iron Ore Particles in Pneumatic Conveying

Won Namkung^†, and Minyoung Cho

Smelting Reduction Research Team, Research Institute of Industrial Science & Technology (RIST), Pohang 790-330, Kyungbuk, Korea

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Loop-seal operation characteristics have been determined in pneumatic conveying (0.078 m ID×6.0 m high) with iron ore particles (680 μm and 4,500 kg/m(3)). Solids circulation rates through the loop-seal increase linearly with increasing vertical aeration rate at constant bottom aeration. When the aeration air is injected at the weir section and the lowest point of vertical section, stable higher solids circulation rates are obtained. The solids circulation rates are predicted by using pressure drop measured in fully developed region of riser. The calculated solids circulation rates are in good agreement with the measured values.

Keywords:Loop-Seal;Iron Ore Particles;Solid Circulation Rate

[References]

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Basu P, Luo Z, Boyd M, Cheng L, Cen K, "An Experimental Investigation into a Loop Seal in a Circulating Fluidized Bed," Circulating Fluidized Bed Technol. VI, Editor Werther, J., DECHEMA, Frankfurt, Germany, 805 (1999)
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Bi HT, Fan LS, AIChE Annual Meeting, Los Angeles, 17 (1991)
Cheng LM, Basu P, Powder Technol., 103(3), 203 (1999)
Geldart D, Jones P, Powder Technol., 67, 163 (1991)
Kim SW, "Solid Recycle Characteristics of Loop-Seals in a Circulating Fluidized Bed," M.S. Thesis, KAIST, Taejon, Korea (1997)
Kim SW, Kim SD, Powder Technol., 124(1-2), 76 (2002)
Kim SW, Namkung W, Kim SD, Korean J. Chem. Eng., 16(1), 82 (1999)
Kim SW, Namkung W, Kim SD, Chem. Eng. Technol., 24(8), 843 (2001)
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Klinzing GE, "Gas-Solid Transport," McGraw-Hill, New York, NY (1981)
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Leung LS, Wiles RJ, Ind. Eng. Chem. Process Des. Dev., 15, 552 (1976)
Lodes A, Mierka D, Powder Technol., 58, 163 (1989)
Merrow E, Chem. Eng. Process., May, 14 (1985)
Nakamura K, Capes CE, Can. J. Chem. Eng., 51, 39 (1973)
Namkung W, Kim SW, Kim SD, HWAHAK KONGHAK, 38(4), 523 (2000)
Won NK, Guy C, Legros R, Chem. Eng. Commun., 188, 47 (2001)
Ozawa M, Tobita S, Mii T, Tomoyasu Y, "Flow Pattern and Flow Behaviour of Solid Particles in L-valve," Circulaing Fluidized Bed Technol. III, Editors Basu, P., Horio, M. and Hasatani, M., Pergamon Press, New York, 615 (1991)
Plasynski SI, Klinzing GE, Mathur MP, Powder Technol., 79(2), 95 (1994)
Punwani DV, Modi MV, Tarman PB, "A Generalized Correlation for Estimating Choking Velocity in Vertical Solids Transport," Proc. Inst. Powder and Bulk Solids Handling and Processing Conference, Powder Advisory Center, Chicago (1976)
ReddyKarri SB, Knowlton TM, "Comparison of Group a and Group B Solids Flow in Underflow Standpipe," Fluidization VII, Editors Potter, O.E and Nicklin, D.J., Engineering Foundation, New York, 345 (1992)
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[Referenced By]

[1] Arena U, Langeli CB, Cammarota A, Powder Technol., 98(3), 231 (1998)

[2] Basu P, Luo Z, Boyd M, Cheng L, Cen K, "An Experimental Investigation into a Loop Seal in a Circulating Fluidized Bed," Circulating Fluidized Bed Technol. VI, Editor Werther, J., DECHEMA, Frankfurt, Germany, 805 (1999)

[3] Berruti F, Muir JR, Behie LA, Can. J. Chem. Eng., 66, 919 (1988)

[4] Bi HT, Fan LS, AIChE Annual Meeting, Los Angeles, 17 (1991)

[5] Cheng LM, Basu P, Powder Technol., 103(3), 203 (1999)

[6] Geldart D, Jones P, Powder Technol., 67, 163 (1991)

[7] Kim SW, "Solid Recycle Characteristics of Loop-Seals in a Circulating Fluidized Bed," M.S. Thesis, KAIST, Taejon, Korea (1997)

[8] Kim SW, Kim SD, Powder Technol., 124(1-2), 76 (2002)

[9] Kim SW, Namkung W, Kim SD, Korean J. Chem. Eng., 16(1), 82 (1999)

[10] Kim SW, Namkung W, Kim SD, Chem. Eng. Technol., 24(8), 843 (2001)

[11] Knowlton TM, "Gas Fluidization Technology," Editors Geldart, D., John Wiles & Sons, New York, 341 (1986)

[12] Knowlton TM, "Non Mechanical Solid Feed and Recycle Devices for Circulating Fluidized Bed," CFB Technol. II, Editors Basu, P. and Large, J.F., Pergamon Press, New York, 31 (1988)

[13] Knowlton TM, Bachovchin CM, "Fluidization Technology," Editors D.L. Keairns et al., Hemisphere Publishing Corporation, Washington, 2, 253 (1976)

[14] Konno H, Saito S, J. Chem. Eng. Jpn., 2, 211 (1969)

[15] Klinzing GE, "Gas-Solid Transport," McGraw-Hill, New York, NY (1981)

[16] Kunii D, Levenspiel O, "Fluidization Engineering," Butterworth-Heinemann (1991)

[17] Lech M, Powder Technol., 114(1-3), 55 (2001)

[18] Leung LS, Wiles RJ, Ind. Eng. Chem. Process Des. Dev., 15, 552 (1976)

[19] Lodes A, Mierka D, Powder Technol., 58, 163 (1989)

[20] Merrow E, Chem. Eng. Process., May, 14 (1985)

[21] Nakamura K, Capes CE, Can. J. Chem. Eng., 51, 39 (1973)

[22] Namkung W, Kim SW, Kim SD, HWAHAK KONGHAK, 38(4), 523 (2000)

[23] Won NK, Guy C, Legros R, Chem. Eng. Commun., 188, 47 (2001)

[24] Ozawa M, Tobita S, Mii T, Tomoyasu Y, "Flow Pattern and Flow Behaviour of Solid Particles in L-valve," Circulaing Fluidized Bed Technol. III, Editors Basu, P., Horio, M. and Hasatani, M., Pergamon Press, New York, 615 (1991)

[25] Plasynski SI, Klinzing GE, Mathur MP, Powder Technol., 79(2), 95 (1994)

[26] Punwani DV, Modi MV, Tarman PB, "A Generalized Correlation for Estimating Choking Velocity in Vertical Solids Transport," Proc. Inst. Powder and Bulk Solids Handling and Processing Conference, Powder Advisory Center, Chicago (1976)

[27] ReddyKarri SB, Knowlton TM, "Comparison of Group a and Group B Solids Flow in Underflow Standpipe," Fluidization VII, Editors Potter, O.E and Nicklin, D.J., Engineering Foundation, New York, 345 (1992)

[28] ReddyKarri SB, Knowlton TM, Litchfield J, "Increasing Solids Flow Rates Through a Hybrid Angled Standpipe Using a Bypass Line," Fluidization VIII, Editors Large, J.F. and Laguerie, Engineering Foundation, New York, 557 (1995)

[29] Rudolph V, Chong YO, Nicklin DJ, "Standpipe Modeling for Circulating Fluidized Beds," Circulating Fluidized Bed Technol. III, Editors Basu, P., Horio, M. and Hasatani, M., Pergamon Press, New York, 49 (1991)

[30] vanSwaaij WPM, , Burman C, vanBreugel JW, Chem. Eng. Sci., 25, 1818 (1970)

[31] Yang WC, Powder Technol., 35, 143 (1983)

[32] Yang WC, Knowlton TM, Powder Technol., 77, 49 (1993)