Extending EMMS-based models to CFB boiler applications--颗粒学报PARTICUOLOGY

Lu, B., Zhang, N., Wang, W., & Li, J. (2012). Extending EMMS-based models to CFB boiler applications. Particuology, 10(6), 663–671. https://doi.org/10.1016/j.partic.2012.06.003

Extending EMMS-based models to CFB boiler applications

Bona Lu^*, Nan Zhang, Wei Wang, Jinghai Li

State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China

10.1016/j.partic.2012.06.003

Volume 10, Issue 6, December 2012, Pages 663-671

Received 28 July 2011, Revised 25 May 2012, Accepted 3 June 2012, Available online 17 August 2012.

E-mail: bnlu@home.ipe.ac.cn

Highlights

► This paper proposed a revised cluster model through re-defining the energy input, for predicting CFBB flows with low solids flux.

► For verification, the revised cluster model was used in EMMS-based drag model to simulate CFBB flows.

► The modified EMMS-based model can capture reasonably well the bubbling-like behavior in the bottom part of CFBB.

Abstract

Recently, EMMS-based models are being widely applied in simulations of high-throughput circulating fluidized beds (CFBs) with fine particles. Its use for low flux systems, such as CFB boiler (CFBB), still remains unexplored. In this work, it has been found that the original definition of cluster diameter in EMMS model is unsuitable for simulations of the CFB boiler with low solids flux. To remedy this, we propose a new model of cluster diameter. The EMMS-based drag model (EMMS/matrix model) with this revised cluster definition is validated through the computational fluid dynamics (CFD) simulation of a CFB boiler.

Graphical abstract

Keywords

EMMS; Cluster; Circulating fluidized bed; Boiler; CFD; Simulation

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