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The growth of production capacity requires a constant increase in fuel consumption, which leads to an inevitable decrease in fossil fuels, whose reserves are limited. As a result, it is necessary to gradually switch to the use of secondary energy resources, in particular, the use of secondary gases generated as a result of production processes. This article discusses the use of natural gas conversion by adding it to a high-temperature converter gas stream in order to reduce its temperature to reduce the thermal load on the heating surface and further use as the main fuel in power units. Using the Ansys Fluent universal software package, a computational model of a natural fuel converter gas pipeline was developed, and the distribution contours of the composition and temperature of the fuel mixture formed by the chemical interaction of gases were obtained. The analysis of the obtained fuel mixture was carried out, and the efficiency of the obtained synthesis gas was compared with the initial fuel. It was shown that as a result of a chemical reaction, the resulting gas has an increase in thermal efficiency by 64 %. The results of this study demonstrate the possibility of further application of the resulting fuel mixture as the main fuel for technological processes.