Effect of H2-injection on the thermodynamic and transportation properties of natural gas

Abstract Condensation of hydrocarbons due to temperature and pressure changes in the pipelines plays an important role in the transportation of natural gas. Injection of hydrogen might change this condensation behavior considerably. The influence of hydrogen on the thermodynamics upon injection, on the Joule–Thomson effect at the pressure reduction stations, on the energy density, on the Wobbe index, and on the pressure drop in the pipelines has been calculated. It has been shown that injection of 25% hydrogen may lead to a temperature drop of several degrees, the temperature drop at the pressure reduction stations reduces by 1 3 , and the pressure drop in the transport lines increases only slightly. Moreover, at 40 bar and 258 K the amount of liquid condensate is slightly less in the case of hydrogen if the same amount of energy is transported.