Modeling Of Radiative Heat Transfer In Oxy-fuel Combustion With Non-gray Sooting Media

Thermal radiation plays an important role in thermal and combustion engineering,especially in high temperature systems where radiation dominated the energy transferprocess. So it is important to calculate radiation heat transfer in combustion systemefficiently and accurately. O2/CO2combustion technology is the most promisingLow-Carbon technology; it is now a hot research field all over the world. While thedifferences of gases composition between O2/CO2combustion and traditional air-firedtechnology should not be ignored when calculating the radiation heat transfer. This papertried to give better radiation property models suit for oxy-fuel combustion in order to get anefficient and accurate forecasting of the radiation heat transfer.This paper mainly taking two global models into consideration: WSGG model andSLW model. First described the principles of these two models, and then compared theperformance (calculation efficiency and precision) of the two models by using them inair-fired and oxy-fuel conditions. The methods of modifying the WSGG model and SLWmodel to be suitable for the oxy-fuel conditions are also given here. The WSGG model andSLW model both have good precision and computational efficiency, SLW model is moreaccurate than WSGG model while more time consuming.Finally, the paper focused on researching the contribution of soot in the radiationprocess. The methods of putting soot’s contribution into WSGG model and SLW model arediscussed: in the WSGG model soot is assumed as a gray gas; while in the SLW model sootis considered as another real gas.