Experimental measurements on chemical reaction and thermal conductivity of the H₂/CO₂/CO/CH₄/H₂O system using the short-hot-wire method at 664–915 K and 9.2–22.2 MPa

The gas mixtures produced in hydrogen energy system mainly include H₂, CO₂, CH₄, CO and H₂O. Thus far, the complicated reaction pathways and heat transfer ability of the H₂/CO₂/CO/CH₄/H₂O system at high temperatures and high pressures remain unknown. In this paper, a system based on the short-hot-wire method with double vessels is applied to monitor the chemical reaction process and the thermal conductivity of the H₂/CO₂/CO/CH₄/H₂O system at 664.5–914.5 K and 9.2–22.2 MPa. The expanded relative uncertainty (k = 2) for the thermal conductivity is estimated as 4.6%. The measurement results pave the way for the exploration on the gas leakage and the permeability of hydrogen through container wall at high temperatures, which is of great significance for hydrogen production, storage, and application.