Dataset of total emissivity for CO2, H2O, and H2O-CO2 mixtures; over a temperature range of 300-2900 K and a pressure-pathlength range of 0.01-50 atm.m

Abstract

This article describes a dataset of total (spectrally-integrated rather than wavelength-dependent) emissivity values pertaining to gaseous media containing carbon dioxide (CO₂) and/or water vapor (H₂O) with the sum of their partial pressures being near the atmospheric level. These conditions may be particularly relevant to flue gases resulting from oxy-fuel combustion. The emissivities here are computed using the EM2C implementations of the statistical narrow band (SNB), and they are made conveniently available as 10 separate plain text files having a unified layout. Each data file in the dataset corresponds to a specific chemical composition (from pure CO₂ to pure H₂O), with eight intermediate H₂O:CO₂ molar ratios being 1:20, 1:8, 1:4, 1:2, 1:1, 2:1, 5:1, and 20:1. In addition, pure CO₂ corresponds to the extreme lower-bound for the H₂O:CO₂ molar (as 0:1), and pure H₂O corresponds to the extreme upper-bound for the H₂O:CO₂ molar ratio (1:0 or infinity). For each chemical composition, the total emissivity values are provided for different pressure-pathlengths and different absolute gas temperatures as two independent variables. The pressure-pathlength range spans about three orders of magnitude, from 0.01 atm.m to 50 atm.m, with 90 nonuniformly-distributed pressure-pathlength values. The absolute gas temperature spans a wide range from 300 K (room temperature) to 2900 K (high-temperature flames) with a uniform step of 25 K separating 105 temperature values. For each data file, there are 90 × 105 (9450) emissivity values; and the entire dataset contains 94500 emissivity values.

Keywords: CO2; Emissivity; H2O; Oxy-fuel; Pressure-pathlength.

Fig. 1

A view of the top part of one of the data files (R=01.000_EM2C-SNB_totalEmissivities_90 × 105.dat).

Fig. 2

A view of an intermediate part of one of the data files (R=01.000_EM2C-SNB_totalEmissivities_90 × 105.dat).

Fig. 3

Sampled one-dimensional profiles of the total emissivity of R (H₂O:CO₂ molar ratio) = 50%:50% as a function of gas temperature, obtained by processing the data file (R=01.000_EM2C-SNB_totalEmissivities_90 × 105.dat).

Fig. 4

Sampled one-dimensional profiles of the total emissivity of R (H₂O:CO₂ molar ratio) = 50%:50% as a function of the pressure-pathlength, obtained by processing the data file (R=01.000_EM2C-SNB_totalEmissivities_90 × 105.dat).