3D full-loop simulation and experimental verification of gas–solid flow hydrodynamics in a dense circulating fluidized bed--颗粒学报PARTICUOLOGY

Wang, X., Wu, X., Lei, F., Lei, J., & Xiao, Y. (2014). 3D full-loop simulation and experimental verification of gas–solid flow hydrodynamics in a dense circulating fluidized bed. Particuology, 16, 218–226. https://doi.org/10.1016/j.partic.2013.11.010

3D full-loop simulation and experimental verification of gas–solid flow hydrodynamics in a dense circulating fluidized bed

Xueyao Wang ^{a b *}, Xuezhi Wu ^{a b}, Fulin Lei ^{a b}, Jing Lei ^c, Yunhan Xiao ^{a b}

a Key Laboratory of Advanced Energy and Power, Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
b Research Center for Clean Energy and Power, Chinese Academy of Sciences, Lianyungang, Jiangsu 222069, China
c School of Energy & Power Engineering, North China Electric Power University, Changping District, Beijing 102206, China

10.1016/j.partic.2013.11.010

Volume 16, October 2014, Pages 218-226

Received 1 February 2013, Revised 19 November 2013, Accepted 29 November 2013, Available online 21 May 2014.

E-mail: Received 1 February 2013, Revised 19 November 2013, Accepted 29 November 2013, Available online 21 May 2014.

Highlights

• The two-fluid model, kinetic theory of granular flow and EMMS method were coupled.

• A 3D full-loop simulation for hydrodynamics of a cold bench-scale dense CFB was performed.

• Compared with Wen-Yu model, this method better predicted axial solids distribution in the riser.

Abstract

Because of their advantages of high efficiency and low cost, numerical research methods for large-scale circulating fluidized bed (CFB) apparatus are gaining ever more importance. This article presents a numerical study of gas–solid flow dynamics using the Eulerian granular multiphase model with a drag coefficient correction based on the energy-minimization multi-scale (EMMS) model. A three-dimensional, full-loop, time-dependent simulation of the hydrodynamics of a dense CFB apparatus is performed. The process parameters (e.g., operating and initial conditions) are provided in accordance with the real experiment to enhance the accuracy of the simulation. The axial profiles of the averaged solid volume fractions and the solids flux at the outlet of the cyclone are in reasonable agreement with experimental data, thereby verifying the applicability of the mathematical and physical models. As a result, the streamline in the riser and standpipe as well as the solids distribution contours at the cross sections is analyzed. Computational fluid dynamics (CFD) serves as a basis for CFB modeling to help resolve certain issues long in dispute but difficult to address experimentally. The results of this study provide the basis of a general approach to describing dynamic simulations of gas–solid flows.

Graphical abstract

Keywords

Gas–solid flow; Circulating fluidized bed; EMMS method; 3D full-loop simulation

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