Non-Gray Radiation Modeling in Oxy-Fuel Combustion Scenarios

摘要

Coal and natural gas combustion were simulated in lab-scale furnaces at air-burnand oxygen-enriched combustion conditions. This study confirms that at certain O_2/CO_2oxidizer compositions, the temperature and heat transfer characteristics found in aircombustion can be replicated. The gas radiative properties were estimated employing twoweighted-sum-of-grey-gases (WSGG) models in gray and non-gray calculations. Innatural gas combustion, the incident radiative flux profiles were distinctly different forthe gray and non-gray calculations. However, the differences among the WSGG modelsthemselves were quite small. In the oxy-coal furnace, the particle absorption coefficientdominated the gas absorption coefficient in the majority of the furnace. However, as theimportance of gas radiation increases along the length of the furnace, the differences dueto the gray and non-gray models become more pronounced.