Akademik Veri Yönetim Sistemi
International Journal of Hydrogen Energy, cilt.143, ss.780-790, 2025 (SCI-Expanded, Scopus)
Stable and low emission combustion studies of hydrocarbon fuels are of great importance. In this study, hydrogen enrichment of Propane gas, which is used in combustion systems today, and Colorless Distributed Combustion conditions were tested. A premixed burner with a low swirl ratio (0.4) was used. The thermal power was kept constant at 5 kW and the equivalence ratio was kept under lean (ϕ = 0.8) conditions. Hydrogen was added up to 30% at intervals of 10% by volume. For all fuel mixtures, the O2/N2+O2 ratio was reduced by adding N2 gas into the oxidizer air. In the study, acoustic enforcements were performed at different frequencies and dynamic pressure amplitudes at resonance frequencies were determined. In addition, flue gas emissions of all fuel mixtures were measured. The results of the study showed that combustion can be performed at lower O2 ratios with the increasing hydrogen. The addition of N2 as a diluent reduced the thermo-acoustic instability of the flame. As the dilution rate was increased, the flame approached the blowoff limit and extinguished under external acoustic enforcement. In all fuel mixtures, the flame temperature and luminous intensity decreased as the O2 ratio of the oxidizer air was reduced. While N2 dilution decreased NOX emissions due to the decreasing flame temperature, it caused an increase in CO emissions. In the fuel mixture with 30% H2 content, the CO emission in combustion with 21% O2 air was measured as 10 ppm, while the CO emission at the 17% O2 ratio increased to 3783 ppm.