Abstract
The article is devoted to estimating the intensifying efficiency of methane-air ignition by adding a small amount of hydrogen and/or ethylene. It presents features of the experimental determination of the ignition delay period for fuel-air mixtures using shock installation and methods of processing empirical data. The testing of the known ignition kinetic models for methane, hydrogen, and ethylene with air was carried out. The results of test calculations were compared with those previously published, as well as original experiments. The kinetic model was chosen to provide the minimum discrepancy between the calculated and experimental data. The regularities of the effect of hydrogen and ethylene additives on the ignition dynamics of the methane-air mixture for the range of initial pressures from 1 to 8 bar at temperatures from 900 to 1100 K were obtained with the use of non-stationary numerical modeling. Methane-air mixtures with the mass fraction of additives not exceeding 10% were studied. The quantitative indicators of possible reduction in the ignition delay period of methane-air mixtures were detected.
Highlights
Based on the comparison of the calculated and experimental data, it is shown that the most satisfactory coincidence of ignition delay period values for mixtures of methane + hydrogen + ethylene with air or oxygen at initial pressures P = 1–8 bar and temperatures T = 900–1100 K can be achieved in the case of using kinetic model NUIGMesh 1.1, which includes 493 components and 2716 reactions
It is shown that the values of the ignition delay period for the mixtures under consideration are in the range from 0.004 to 0.5 s
According to the data obtained, the ignition delay period of a fuel based on methane with additions of hydrogen and ethylene can be reduced by up to 3 times relative to the ignition delay period of pure methane in air
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. The practical use of methane and hydrogen mixtures as a fuel for internal combustion engines is considered in [22,23,24,25,26] and in [27,28,29] for power plants based on boiler and turbine devices In these works, it was shown that the addition of hydrogen (less than 10%) made it possible to reduce NOx emissions and improve the characteristics of power plants due to an increase in the flame spreading rate and homogenization of the mixture in the working zone due to high diffusion of hydrogen.
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