Large Eddy Simulation of a 100 kWth swirling oxy-coal furnace

FUEL

卷:181

Article

Franchetti, B. M.¹  Marincola, F. Cavallo¹  Navarro-Martinez, S.¹  Kempf, A. M.^2,3 

[1] Univ London Imperial Coll Sci Technol & Med, Exhibit Rd, London SW7 2AZ, England

[2] Univ Duisburg Essen, Chair Fluid Dynam, D-47048 Duisburg, Germany

[3] Univ Duisburg Essen, CCSS, D-47048 Duisburg, Germany

关键词: Large Eddy Simulation;    Coal combustion;    Oxy-coal;    Turbulent combustion;   

DOI  :  10.1016/j.fuel.2016.05.015

来源: Elsevier

【 摘 要 】

Large Eddy Simulation (LES) has been applied to the swirling 100 kW(th) OXYCOAL-AC test facility of Aachen University. A set of models to represent devolatilisation, volatile combustion, char combustion and radiation for oxy-coal combustion in an LES framework has been implemented and tested. A qualitative analysis of the flow behaviour and the overall coal combustion processes occurring within the furnace was made. The LES results for the flow field were compared to axial and tangential mean velocity measurements, showing good agreement, particularly in the upstream regions of the flame. The LES results were also compared to oxygen concentrations (vol.) and gas temperature. Overall good agreement was observed in the upstream central regions of the flame, whilst downstream the LES overestimated the combustion rates. It was also found that the recirculation zones are sensitive to char combustion, not just to the rate of devolatilisation as one might expect. An interesting problem occured in the prediction of the velocity profiles, for which the measurements were taken based on coal-particles, so that the outer-most stream remained invisible in the experiments (but not the LES), due to being free from particles. The results show the potential of using LES for more complex oxy-coal combustion burners and opens the way for applications to industrial furnaces. (C) 2016 Elsevier Ltd. All rights reserved.

【 授权许可】

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