Abstract
A simple method for calculation of high-temperature equilibrium composition has been developed for the C-H-O system of the species H2, H2O, CO, CO2, CH4, O2, and solid C. The calculation process has been simplified by using the most fundamental equilibria for high-temperature reactions of gaseous species. This method is applied for cases of carbon activity equal to or less than 1 using the identical equilibria. We have also applied the method to two kinds of gases for a high-temperature gas-cooled reactor, which are an impure helium gas for the reactor coolant and a reducing gas for the utility system of the reactor. Characteristics of these gases are discussed from the viewpoint of corrosion and hydrogen permeation of the reactor materials.
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