Prediction of the Thermal Conductivity of H2/CO2/CO/CH4/H2O Mixtures at High Temperatures and High Pressures Based on the Extended Corresponding States Principle

An improved extended corresponding states principle for predicting the thermal conductivity of H2/CO2/CO/CH4/H2O mixture is presented. The model uses hydrogen as a reference fluid and employs shape factors and a density-modified parameter. Calculations for the thermal conductivity require only critical constants, molecular weight, the ideal gas heat capacity, the dilute gas viscosity, and mole fraction for each mixture component as input. The model was tested for pure fluids, binary hydrogen-containing mixtures, a binary non-hydrogen-containing mixture, and quinary mixtures at temperature up to 915 K. The average absolute deviation between experiments and predictions is less than 4.52 %. The present model is suitable for prediction at temperatures lower than 1000 K and pressures lower than 20 MPa with an uncertainty of 6.12 % (k = 2), which is necessary for the implementation of hydrogen generation systems and has potential to be applied to more species and mixtures.