No abstract

No abstract

Summary Pressurized oxy‐fuel combustion is expected to increase combustion efficiency and substantially reduce costs of carbon capture. The gas radiative property in pressurized oxy‐fuel combustion is significantly different from atmospheric oxy‐fuel combustion and the air‐fuel combustion. In this study, an extension and improvement to previous weighed sum of gray gases (WSGG) model have been provided for pressurized oxy‐fuel combustion, based on the latest implementation for the correlated k‐values. The model is valid for the pressure between 1 and 30 bar, temperature between 600 and 2500 K, and mole ratio of H2O to CO2 between 0.05 and 4.0. The new pressurized WSGG model is extensively validated using the line‐by‐line solution with HITEMP 2010 database, in terms of the gas emissivity and radiative source term. The average relative error of radiative source term is less than 8% in non‐isothermal inhomogeneous gas mixture at elevated pressures. The results of radiative heat flux on the wall show that the heat transfer efficiency in non‐isothermal condition is much lower than that in isothermal condition beyond the pressure path length of 10 bar·m, due to the self‐absorption of the gas mixture.

No abstract