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Evaluation of gas radiation models in CFD modeling of oxy-combustion

M. A. Rajhi ; R. Ben-Mansour ; M. A. Habib ; M. A. Nemitallah ; Klas Andersson (Institutionen för energi och miljö, Energiteknik)
Energy Conversion and Management (0196-8904). Vol. 81 (2014), p. 83-97.
[Artikel, refereegranskad vetenskaplig]

Proper determination of the radiation energy is very important for proper predictions of the combustion characteristics inside combustion devices using CFD modeling. For this purpose, different gas radiation models were developed and applied in the present work. These radiation models vary in their accuracy and complexity according to the application. In this work, a CFD model for a typical industrial water tube boiler was developed, considering three different combustion environments. The combustion environments are air-fuel combustion (21% O-2 and 79% N-2), oxy-fuel combustion (21% O-2 and 79% CO2) and oxy-fuel combustion (27% O-2 and 73% CO2). Simple grey gas (SGG), exponential wide band model (EWBM), Leckner, Perry and weighted sum of grey gases (WSGG) radiation models were examined and their influences on the combustion characteristics were evaluated. Among those radiation models, the EWBM was found to provide close results to the experimental data for the present boiler combustion application. The oxy-fuel combustion characteristics were analyzed and compared with those of air-fuel combustion.

Nyckelord: Gas radiation models, Oxy-fuel combustion, Air combustion, Computational fluid dynamics (CFD)



Denna post skapades 2014-07-02.
CPL Pubid: 200073

 

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Institutioner (Chalmers)

Institutionen för energi och miljö, Energiteknik

Ämnesområden

Energiteknik

Chalmers infrastruktur