직경 0.1m, 높이 2.1m의 전기가열방식의 유동층에서 층물질로 모래를 사용하여 온도(24-600℃) 및 기체유속(0.5-2.0m/s)의 변화에 따른 전이영역에서 촉방향 고체체류량 분포의 감쇄상수를 측정하였다. 전이영역에서 고체체류량 분포의 감쇄상수는 유속이 증가함에 따라 감소하였고, 유속의 영향은 온도가 증가할수록 완만해지는 경향을 보였다. 일정유속에서 감쇄상수는 온도가 증가함에 따라 증가하였으며, 온도의 영향은 유속이 증가함에 따라 증가하였다. 본 연구의 결과와 타연구자들의 결과를 사용하여 감쇄상수에 대한 온도의 영향이 고려된 다음의 상관식을 제시하였다. adp=exp(-11.2+210dp/(Dt-dp))(dpρg(U-Umf)/μ)-0.492[ρpgdp/ρg(U-Umf)2]0.725((ρp-ρg)/ρg)0.731CD-1.47
Effects of temperature(24-600℃) and gas velocity(0.5-2.0m/s) on the decay constant of axial solid holdup profile of the splash region have been measured in a gas fluidized bed(0.1m-i.d., 2.1m height) equipped with an electric heater. Sand was used as a bed material. The decay constant of axial solid holdup profile in the splash region decreased with an increase of the gas velocity. As the temperature increased, the effect of the temperature on the decay constant increased as the gas velocity increased. Based on results of this study and previous studies, a correlation on the decay constant that considers the effect of temperature was proposed as follows : adp=exp(-11.2+210dp/(Dt-dp))(dpρg(U-Umf)/μ)-0.492[ρpgdp/ρg(U-Umf)2]0.725((ρp-ρg)/ρg)0.731CD-1.47
Arena U, Malandrino A, Marzocchella A, Massimilla L, "Circulating Fluidized Bed Technology III," edited by Basu, p., Horio, M. and Hasatami, M., Pergamon Press, Oxford, 137, 1990
Arena U, Cammarota A, Marzocchella A, Massimilla L, Proc. of the 12th Int. Conf. on Fluidized Bed Combustion, 899, 1993
Bai DR, Jin Y, Yu ZQ, Zhu JX, Powder Technol., 71, 51, 1992
Hartge EU, Li Y, Werther J, "Circulating Fluidized Bed Technology," edited by Basu, P., Pergamon Press, Toronto, Ont., 153, 1986
Horio M, Morishita K, Tachibana O, Murata M, "Circulating Fluidized Bed Technology II," edited by Basu, P. and Large, J.F., Pergamon Press, Oxford, 147, 1988
Kato K, Shibasaki H, Tamura K, Wang C, Takarada T, "Fluidization '87: Korea and Japan, Proc. 1st Korea-Japan Symp. on Fluidization," PangHan Pub. Co., Seoul, 229, 1987
Kato K, Takarada T, Tamura T, Nishino K, "Circulating Fluidized Bed Technology III," edited by Basu, P., Horio, M. and Hasatami, M., Pergamon Press, Oxford, 145, 1990
Li J, Tung Y, Kwauk M, "Circulating Fluidized Bed Technology II," edited by Basu, P. and Large, J.F., Pergamon Press, Oxford, 193, 1988