The influence of the gas-distributing grid diameter on the transition velocity and hydrodynamics of the bottom layer in circulating fluidized bed installations / Tuponogov V.G., Baskakov A.P. // Thermal Engineering (English translation of Teploenergetika). - 2013. - V. 60, l. 11. - P. 808-812.

ISSN:
00406015
Type:
Article
Abstract:
The dependences of dimensionless fluidization velocities separating bubble, transition, and fast fluidization regimes on the properties of dispersed material for particles belonging to groups B and D (according to D. Geldart's classification) are presented. Correspondence between the considered dependences and experimental data obtained by different researchers and their correlation with critical fluidization velocities and particle terminal velocities are shown. The hydrodynamic mechanisms governing the saturation of fluidized bed with bubbles on reaching the transition fluidization velocity in installations having different sizes are considered. Factors due to which a bottom bubble layer disappears in narrow installations and is retained on large-diameter grids in an intense channel forming mode are explained. Experimental data are presented from which it is seen that the bubble layer hydrodynamics depends on the gas-distributing grid diameter and that this diameter has an insignificant influence on the fluidization velocity during the transition from a bubble to fast fluidization regime. © 2013 Pleiades Publishing, Inc.
Author keywords:
bottom layer; bubbles; fluidization regimes; gas-distributing grid; transition velocities
Index keywords:
Bubbles (in fluids); Fluidized beds; Hydrodynamics; Velocity; Bottom layers; Circulating fluidized bed; Critical fluidization velocity; Fluidization regimes; Fluidization velocity; Gas-distributing gr
DOI:
10.1134/S0040601513110116
Смотреть в Scopus:
https://www.scopus.com/inward/record.uri?eid=2-s2.0-84886882821&doi=10.1134%2fS0040601513110116&partnerID=40&md5=44813e9ee28fec090b819f8d460f0596
Соавторы в МНС:
Другие поля
Поле Значение
Link https://www.scopus.com/inward/record.uri?eid=2-s2.0-84886882821&doi=10.1134%2fS0040601513110116&partnerID=40&md5=44813e9ee28fec090b819f8d460f0596
Affiliations Ural Federal University, ul. Mira 19, Yekaterinburg 620002, Russian Federation
Author Keywords bottom layer; bubbles; fluidization regimes; gas-distributing grid; transition velocities
References Batenin, V.M., Zeigarnik, Y.A., Maslennikov, V.M., About the strategy for development of the russian power engineering (after ten years) Therm. Eng., No. 4, p. 261; Ryabov, G.A., Folomeev, O.M., Substantiating the techniques for calculating the furnace circuit of circulating fluidized bed boilers (2011) Therm. Eng., No. 6, p. 456; Arnaldos, J., Casal, J., Prediction of transition velocities and hydrodynamical regimes in fluidized beds (1996) Powder Technology, 86, p. 285. , 10.1016/0032-5910(95)03054-9; Nakajima, M., Harada, M., Asai, M., Bubble fraction and voidage in an emulsion phase in the transition to a turbulent fluidized bed (1991) Proceedings of the 3rd Conference on CFB Technology, pp. 79-84. , Pergamon Press Oxford; Geldart, D., (1986) Gas Fluidization Technology, , (eds) J. Wiley & Sons Ltd. Chichester; Todes, O.M., Tsitovich, O.B., (1981) Granulated Fluidized Bed Apparatuses, , Khimiya Leningrad; Matsen, J.M., Scale-up of fluidized bed processes: Principle and practice (1996) Powder Technology, 88, p. 237. , 10.1016/S0032-5910(96)03126-9; Zavarov, A.S., Baskakov, A.P., Grachev, S.M., (1985) Chemicothermal Treatment in A Fluidized Bed, , Mashinostroenie Moscow; Chen, A., Bi, H.T., Pressure fluctuations and transition from bubbling to turbulent fluidization (2003) Powder Technology, 133, p. 237. , 10.1016/S0032-5910(03)00119-0; Lee, G.S., Kim, S.D., Bed expansion characteristics and transition velocity in turbulent fluidized bed (1990) Powder Technology, 62, p. 207. , 10.1016/0032-5910(90)80107-A; Johnsson, F., Zijerveld, R.C., Schouten, J.C., Characterization of regimes by time-series analysis of pressure fluctuations (2000) Int. J. Multiphase Flow, 26, p. 663. , 10.1016/S0301-9322(99)00028-2; Zhang, W., Johnsson, F., Leckner, B., Time-dependent behavior of particle flow in CFD boilers Proceedings of the Tenth Eng. Found. Conf. on Fluidization, Beijing, China, May 20-25, 2001, pp. 253-260
Publisher Maik Nauka-Interperiodica Publishing
CODEN THENA
Language of Original Document English
Abbreviated Source Title Therm Eng
Source Scopus