Effect of fluidizing velocity on gas bypass and solid fraction in a dual fluidized bed gasifier and a cold model--颗粒学报PARTICUOLOGY

Lim, M. T., Saw, W.-L., & Pang, S. (2015). Effect of fluidizing velocity on gas bypass and solid fraction in a dual fluidized bed gasifier and a cold model. Particuology, 18, 58–65. https://doi.org/10.1016/j.partic.2014.05.007

Effect of fluidizing velocity on gas bypass and solid fraction in a dual fluidized bed gasifier and a cold model

Mook Tzeng Lim ^a, Woei-Lean Saw ^b, Shusheng Pang ^a *

a Department of Chemical and Process Engineering, University of Canterbury, Private Bag 4800, Christchurch, New Zealand
b Centre for Energy Technology, School of Chemical Engineering, University of Adelaide, Adelarde, Australia

10.1016/j.partic.2014.05.007

Volume 18, February 2015, Pages 58-65

Received 20 October 2013, Revised 30 April 2014, Accepted 21 May 2014, Available online 12 September 2014.

E-mail: shusheng.pang@canterbury.ac.nz

Highlights

• N₂ bypass through the chute between FFB and BFB in a dual fluidized bed gasifier was studied.

• The effect of fluidizing velocity on the hydrodynamics of the DFBG and DFCM was investigated.

• Correlations for height-averaged solid fraction in the bottom of FFB and BFB were developed.

• The correlations are useful for potential industry applications.

Abstract

Dual fluidized bed gasifiers (DFBG) are effective in producing nitrogen-free syngas from biomass. However, to improve the gasifier performance, pressure drops and solid fractions within the DFBG system need to be controlled. In this study, the effects of varying the fluidizing velocity in the fast fluidized bed (FFB) on the pressure drops and the solid fractions in the system were investigated in a 100 kW DFBG and in a dual fluidized bed cold model (DFCM). Based on the experimental results, empirical correlations were developed to predict the height-averaged solid fraction in the bottom section of the FFB. Accuracy and advantages of the correlations were analyzed. The correlation is useful for design and modeling of the DFBG systems where the height-averaged solid fraction is required to be determined.

Graphical abstract

Keywords

Cold model; Hydrodynamics; Steam gasification; Dual fluidized bed

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