Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 08, 2024 - September 11, 2024
In recent years, the development of fuels that reduce CO2 emissions in the process from production to use has been promoted with the aim of achieving carbon neutrality. Hydrogen fuels in particular are attracting attention as a fuel that can reduce CO2 emissions to zero by utilizing renewable energy sources. However, while demand for hydrogen fuels is currently rising rapidly, the supply of hydrogen fuels has not been able to increase stably, and it is not yet clear whether the entire consumption can be covered by production from renewable energy sources alone. Therefore, it is hoped that mixing hydrogen with other fuels will reduce the initial requirement and lead to a stable supply in stages. Natural gas, which has an excellent stable supply, is a suitable fuel for mixing, but the combustion characteristics of hydrogen and natural gas in co-firing have not yet been sufficiently studied. This study focuses on the composition of the fuels and aims to clarify the combustion characteristics, especially the areas where thermal efficiency can be improved, for three factors: hydrogen mixing ratio, excess air ratio and power output. Experiments were carried out on a mixture of methane and hydrogen, the main components of natural gas, using a rapid compression and expansion machine. Analyses were carried out using pressure diagrams and heat generation rates taken under various conditions, and visualized images of the combustion process taken using a high-speed video camera.
