High-Temperature Properties of CO2 Mixed with N2:—Comparison to CO2 Mixture with O2—

概要

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Concerning CO2 and its mixture with N2 at a concentration of 0.2, an enthalpy h, a specific heat CP, an electrical conductivity σ and a thermal conductivity κ at temperatures of 300-20,000K were obtained to find out effect of N2 addition on these high-temperature properties. For comparison, similar determination was also performed for CO2-O2 mixture. Admixing N2 and O2 with CO2 proved to result in significant variation in CP and κ in a temperature range from 5,000 to 10,000K. The temperature reduction factor was furthermore derived to find out the property as the arc-quenching gas. This evaluation led to the suggestion that adding N2 to CO2 achieves rapid decay in an interrupting arc temperature in a range from 7,000 to 11,000K, while admixing O2 with CO2 produces rapid diminishing effect on the interrupting arc temperature in a range from 5,000 to 9,000K. An attribution analysis successfully gave the fact that these effects on rapid decay in the temperature arise from variation in CP due to N2 and O2 additions, furthermore from the reactions 2N⇔N2 and C+O⇔ CO.