Spectral radiative energy and exergy analysis of oxy-fuel gaseous media in one-dimensional furnace cases

Abstract

In this study, the spectral radiation characteristics of gaseous media during oxy-fuel combustion are investigated using the heat transfer method from the perspective of energy quality and utilization. Based on the gas radiation model and radiation thermodynamic theory, the effects of different parameters on the spectral radiation proportion and total radiation flux are investigated in one-dimensional furnace cases, including the temperature, pressure, and molar ratio. Based on the results of radiative energy and exergy, a model was established to predict the spectral radiative exergy characteristics of gas flame in furnace. It is found that temperature is the dominant influencing factor. At a flame average temperature of 1600 K, the proportion of spectral radiation in the waveband of 0–2 μm accounts for 26.8%. The high-temperature and short-wavelength spectral radiation has a high exergy-to-energy ratio. Increases in the total pressure and molar ratio increase the total radiative energy, exergy, and short-wavelength radiation ratio, whereas the total pressure has less effect when the pressure is greater than 5 bar. The proposed model for predicting radiative exergy has an error of only about 1% within the flame temperature range. This study provides a reference for future research on the frequency-splitting cascade utilization and management of radiation energy in fuel combustion.