Prediction of properties of hydrogen gas mixtures ased on known characteristics of natural gas
DOI:
https://doi.org/10.31471/1993-9868-2026-1(45)-13-27Keywords:
alternative energy sources, gas distribution networks, density, volumetric heat of combustion, Wobbe numberAbstract
One of the real ways to solve the problem of decarbonization is the use of gas-hydrogen mixtures as an alternative to natural gas in gas supply systems of settlements. The practical implementation of this technology requires solving a number of tasks related to ensuring the safety and reliability of transportation and distribution of energy carriers, adjusting the operating modes of existing gas distribution networks in order to supply the volumes of energy that were previously provided by natural gas. The operating parameters of pipelines directly depend on the properties of gas-hydrogen mixtures. The aim of the work is to obtain analytical dependencies that make it possible to predict the properties of a gas-hydrogen mixture with a certain molar concentration of hydrogen under standard conditions based on the relevant characteristics of the base natural gas. The composition of the components of the base natural gas must meet the regulatory requirements for supply to the gas transportation system of Ukraine. The study was conducted for two values of the standard temperature of volume measurement: 0 °C and 20 °C. Taking into account the requirements of regulatory documents, variants of the composition of the components of the base natural gas were formed and their properties were determined taking into account the real state. According to the results of multivariate calculations, the properties of gas-hydrogen mixtures were found for each variant of the base natural gas in the range of molar concentrations (0-100) % of hydrogen. Analytical dependences for predicting the density, relative density, higher and lower volumetric heat of combustion, higher and lower Wobbe number and kinematic viscosity of gas-hydrogen mixtures depending on the molar concentration of hydrogen and similar properties of the base natural gas were obtained using mathematical modeling methods. The proposed mathematical models can be used for operational gas-dynamic calculations of gas networks for the transportation of gas-hydrogen mixtures.
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