Article | Proceedings of The 60th SIMS Conference on Simulation and Modelling SIMS 2019, August 12-16, Västerås, Sweden | Effect of Superficial Gas Velocity on Bubbling Fluidized Bed Behaviour in a Biomass Gasifier Linköping University Electronic Press Conference Proceedings
Göm menyn

Title:
Effect of Superficial Gas Velocity on Bubbling Fluidized Bed Behaviour in a Biomass Gasifier
Author:
Cornelius Agu: Department of Process, Energy and Environmental Technology, University of South-EasternNorway, Porsgrunn, Norway Britt M.E. Moldestad: Department of Process, Energy and Environmental Technology, University of South-EasternNorway, Porsgrunn, Norway
DOI:
https://doi.org/10.3384/ecp20170158
Download:
Full text (pdf)
Year:
2019
Conference:
Proceedings of The 60th SIMS Conference on Simulation and Modelling SIMS 2019, August 12-16, Västerås, Sweden
Issue:
170
Article no.:
024
Pages:
158-163
No. of pages:
6
Publication type:
Abstract and Fulltext
Published:
2020-01-24
ISBN:
978-91-7929-897-5
Series:
Linköping Electronic Conference Proceedings
ISSN (print):
1650-3686
ISSN (online):
1650-3740
Publisher:
Linköping University Electronic Press, Linköpings universitet


Export in BibTex, RIS or text

This study investigates the behaviour of bubbling fluidized beds in biomass gasification processes based on the variation of superficial gas velocity at different temperatures and air flow rates. In the paper, the operating window is defined as the gas velocity between the minimum fluidization and slugging velocities, which are computed using the correlations in the literature. The analysis shows that the operating gas velocity depends on the amount of char accumulated in the bed. An increase in the char accumulation results in higher minimum fluidization and slugging velocities of the bed mixture. This therefore suggests that the gas velocity ratio required to achieve the desired operating fluidized bed regime is higher when the biomass accumulation is considered.

Keywords: biomass, gasification, air-fuel ratio, CPFD, bubbling fluidized bed

Proceedings of The 60th SIMS Conference on Simulation and Modelling SIMS 2019, August 12-16, Västerås, Sweden

Author:
Cornelius Agu, Britt M.E. Moldestad
Title:
Effect of Superficial Gas Velocity on Bubbling Fluidized Bed Behaviour in a Biomass Gasifier
DOI:
10.3384/ecp20170158
References:

C.E. Agu, C. Pfeifer, and B.M.E. Moldestad. Prediction of void fraction and minimum fluidization velocity of a binary mixture of particles: Bed material and fuel particles. Powder Technology, 349: 99 – 107, 2019(a).

C.E. Agu, C. Pfeifer, L.-A. Tokheim, and B.M.E. Moldestad. Behaviour of biomass particles in a bubbling fluidized bed: A comparison between wood pellets and wood chips. Chemical Engineering Journal, 363: 84 – 98, 2019(b).

C.E. Agu, C. Pfeifer, M. Eikeland, L.-A. Tokheim, and B.M.E. Moldestad. Models for predicting average bubble diameter and volumetric bubble flux in deep fluidized beds. Industrial & Engineering Chemistry Research, 57: 2658 – 2669, 2018.

C.E. Agu, C. Pfeifer, M. Eikeland, L.-A. Tokheim, and B.M.E Moldestad. Measurement and characterization of biomass mean residence time in an air-blown bubbling fluidized bed gasification reactor. Fuel, 253: 1414 – 1423, 2019(c).

M.J. Andrews and P.J. O’Rourke. The multiphase particle-in-cell (MP-PIC) method for dense particulate flows. International Journal of Multiphase Flow, 22: 379 – 402, 1996.

J. Baeyens and D. Geldart. An Investigation into slugging fluidized beds. Chemical Engineering Science, 29: 255 – 265, 1974.

J.S.M. Botterill, Y. Teoman, and K.R. Yuregir. The effect of operating temperature on the velocity of minimum fluidization, bed voidage and general behaviour. Powder Technology, 31: 101 – 110, 1982.

C. Chen, J. Werther, S. Heinrich, H.-Y. Qi, and E.-U. Hartge. CPFD simulation of circulating fluidized bed risers. Powder Technology, 235: 238 – 247, 2013.

S. Ergun. Fluid flow through packed column. Chemical Engineering Progress, 48: 89 – 94, 1952.

Y. Hatate, K. Ijichi, Y. Uemura, M. Migita, and D.F. King. Effect of bed temperature on bubble size and bubble rising velocity in a semi-cylindrical slugging fluidized bed. Journal of Chemical Engineering of Japan, 23: 765 – 767, 1990.

A.C. Kumoro, D.A. Nasution, A. Cifriadi, A. Purbasari, and A.F. Falaah. A new correlation for the prediction of minimum fluidization of sand and irregularly shape biomass mixtures in a bubbling fluidized bed. International Journal of Applied Engineering Research, 9(23): 21561 – 21573, 2014.

D. Kunii and O. Levenspiel. Fluidization Engineering, 2nd ed., Butterworth – Heinemann, Washington Street, USA, 1991.

N. Nemati, R. Zarghami, and N. Mostoufi. Investigation of hydrodynamics of high temperature fluidized beds by pressure fluctuations. Chemical Engineering & Technology, 39: 1527 – 1536, 2016.

T. Otake, S. Tone, M. Kawashima, and T. Shibata. Behaviour of rising bubbles in a gas fluidized bed at elevated temperature. Journal of Chemical Engineering of Japan, 8: 388 – 392, 1975.

R.R. Pattipati and C.Y. Wen. Minimum fluidization velocity at high temperature. Industrial & Engineering Chemistry Process Design and Development 20: 705 – 708, 1981.

S. Shaul, E. Rabinovich, and H. Kalman. Generalized flow regime diagram of fluidized beds based on the height to bed diameter ratio. Powder Technology 228: 264 – 271, 2012.

C. Si and Q. Guo. Fluidization characteristics of binary mixtures of biomass and quartz sand in an acoustic fluidized bed. Industrial & Engineering Chemistry Research 47: 9773 – 9782, 2008.

C.Y. Wen and Y.H. Yu. A generalized method for predicting the minimum fluidization velocity. AIChE Journal 12: 610 – 612, 1966.

Proceedings of The 60th SIMS Conference on Simulation and Modelling SIMS 2019, August 12-16, Västerås, Sweden

Author:
Cornelius Agu, Britt M.E. Moldestad
Title:
Effect of Superficial Gas Velocity on Bubbling Fluidized Bed Behaviour in a Biomass Gasifier
DOI:
https://doi.org10.3384/ecp20170158
Note: the following are taken directly from CrossRef
Citations:
No citations available at the moment


Responsible for this page: Peter Berkesand
Last updated: 2019-11-06