| Oxy-fuel combustion technology is a new clean-combustion technology. The concentration of CO2 in flue gas reaches 90% approximately. So the characteristics of heat transfer of flue gas have changed to a large extent. Radiative properties of mixture gas with high carbon dioxide concentration are calculated and analyzed by using the weighted sum of grey gases model, Leckner method which based on the narrow spectrum model and the exponential wide band model. According to the features of flue gas in O2/CO2 combustion, appropriate formulas are chose to calculate interrelated physical datas of gas mixture. Combined with the characteristics of O2/CO2 combustion, diffrences between this technology and air-fired technology are put forward and analyzed. The general overall layout of the boiler at this atmosphere is accomplished. Based on a coal-fired boiler of 300 MW of Hengshui power station, boiler thermodynamic calculation is carried out using EWBM which is mature and easy to compute in relative terms and the computation method of convention heat transfer. Then suitabal configurations of heating surface are obtained.
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