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난류유동층에서 고속유동층으로의 전이유속에 대한 온도의 영향
Effect of Temperature on Transition Velocity from Turbulent Fluidization to Fast Fluidization in a Gas Fluidized Bed
한국에너지기술연구원, 대전 305-343 1충북대학교 공업화학과, 전주 361-763
Korea Institute of Energy Research, Daejeon 305-343, Korea 1Dept. of Industrial Chemistry Engineering, Chungbuk National University, Chongju 361-763, Korea
HWAHAK KONGHAK, August 2001, 39(4), 456-464(9), NONE
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Abstract
난류유동층에서 고속유동층으로의 전이유속에 미치는 온도의 영향을 고찰하기 위해 층물질로 모래(평균입경:0.256 mm, 입자밀도: 2,617 kg/m(3))를 사용한 고온 순환유동층(내경 0.02 m, 높이 2.0 m)에서 emptying time method에 의해 고속유동층으로의 전이유속(U(tr))을 측정 및 고찰하였다. 측정된 고속유동층으로의 전이유속은 온도가 증가함에 따라 증가하였다. 본 실험의 측정값 및 문헌의 보고들과 기존 상관식을 비교하였으며 기존 상관식들 중 Chehboumi 등 [19]의 상관식이 측정값들과 가장 유사한 결과를 나타내었다.
Transition velocity from turbulent to fast fluidization has been measured by emptying time method in a high tem-perature circulating fluidized bed(0.02 m i.d. and 2.0 m high) of sand particle(specific surface mean diameter: 0.256 mm, particle density: 2,617 kg/m(3)) with variation of temperature(15-600 ℃). Measured transition velocity from turbulent to fast fluidization_x000D_
increased with increasing temperature. The previous correlations on transition velocity to fast fluidization compared with the meas-ured values. Among the previous correlations, correlation of Chehbouni et al.[19] shows relatively good results.
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Lewis WK, Gilliland ER, Bauer WC, Ind. Eng. Chem., 41, 1104 (1949)
Yerushalmi J, Turner DH, Squires AM, Ind. Eng. Chem. Proc. Des. Dev., 15, 47 (1976)
Avidan A, Yerushalmi J, Powder Technol., 32, 223 (1982)
Schnitzlein MG, Weinstein H, Chem. Eng. Sci., 46, 2605 (1988)
Yerushalmi J, Cankurt NT, Powder Technol., 24, 187 (1979)
Horio M, Nishimuro M, Ishii H, Proc. of the 3rd SCEJ Symp. on Circulating Fluidized Beds, 54 (1989)
Bi HT, Jiang PJ, Fan LS, AIChE Meeting, Paper no. 101d, Los Angeles (1991)
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Horio M, Ishii H, Nishimuro M, Powder Technol., 70, 229 (1992)
Adanez J, de Diego LF, Gayan P, Powder Technol., 77, 61 (1993)
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Chen B, Li Y, Wang F, Wang S, Kwauk M, Chem. Mater-lurgy, 4, 20 (1980)
Li Y, Kwauk M, "Fluidization," edited by Grace, JR and Matsen, JM, Plenum Press, New York, 537 (1980)
Kwauk M, Wang N, Li Y, Chen B, Shen Z, "Circulating Fluidized Bed Technology," edited by Basu, P., Pergamon Press, Toronto, 33 (1985)
Perales JF, Coll T, Llop MF, Puigjaner L, Arnaldos J, Cassal J, "Circulating Fluidized Bed Technology III," edited by Basu, P., Horio, M. and Hasatani, M., Pergamon Press, New York, 73 (1990)
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Namkung W, Kim SW, Kim SD, Chem. Eng. J., 72(3), 245 (1999)
Lee JS, Kim SD, HWAHAK KONGHAK, 20(3), 207 (1982)
Shin BC, Koh YB, Kim SD, HWAHAK KONGHAK, 22(5), 253 (1984)
Han GY, Lee GS, Kim SD, Korean J. Chem. Eng., 2(2), 141 (1985)
Delebarre A, Bitaud B, Regnier MC, Powder Technol., 91(3), 229 (1997)
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Bi HT, Fan LS, AIChE J., 38(2), 297 (1992)
Choi JH, Son JE, Kim SD, J. Chem. Eng. Jpn., 22, 597 (1989)
Son JE, Choi JH, Kim SD, "Fluidization VI," edited by Grace JR, Shemilt LW and Bergougnou MA Engineering Foundation, 113 (1989)
Merrick D, Highley J, AIChE Symp. Ser., 70, 366 (1974)
Lee JK, Hu CG, Shin YS, Chun HS, Can. J. Chem. Eng., 68, 824 (1990)
Park SS, Choi YT, Lee GS, Kim SD, "Circulating Fluidized Bed Technology," edited by Basu, P., Horio M and Hasatani M, Pergamon Press, Oxford, 497 (1990)
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Wen CY, Chen LH, Proc. 6th Int. Conf. on FBC, III, 1115 (1980)
Romanova TT, Deposited Doc., Viniti 5129-80 (1980)
Milne BJ, Berruti F, Behie LA, Theo JW, Proc. 4th Int. Conf. on CFB, 29 (1993)
Zhang X, Cao Y, Ren Y, Chen J, Hong Y, Proc. 8th Int. Conf. on FBC, I, 75 (1985)
George SE, Grace JR, Can. J. Chem. Eng., 59, 279 (1981)
Choi JH, Choi KB, Kim P, Shun DW, Kim SD, HWAHAK KONGHAK, 33(5), 580 (1995)
Ryu HJ, Choi JH, HWAHAK KONGHAK, 35(2), 173 (1997)
May WG, Russel FR, paper presented at the North Jersey section of the A.C.S.(Jan. 25, 1954) (1954)
Zenz FA, Weil NA, AIChE J., 4, 472 (1958)
Chan IH, Knowlton TM, "Fluidization," edited by Kunii, D. and Toei, R., Engineering Foundation, 283 (1984)
Knowlton TM, "Fluidization VII," edited by Potter, O.E. and Niclin, D.J., 27 (1992)
Knowlton TM, Findlay J, Sishtla C, Final Report, DOE/MC/22061-2883, DE90 009699 (1990)
Li J, Li Y, Kwauk M, "Circulating Fluidized Bed Technology II," edited by Basu P and Large JF, Pergamon Press, Toronto, 75 (1988)
