Hydrogen Enrichment Effect on Heat Flux from Plasma-Assisted Flames

Ignas Ambrazevičius, Rolandas Paulauskas, Justas Eimontas (), Nerijus Striūgas and Adolfas Jančauskas
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Ignas Ambrazevičius: Laboratory of Combustion Processes, Lithuanian Energy Institute, 44403 Kaunas, Lithuania
Rolandas Paulauskas: Laboratory of Combustion Processes, Lithuanian Energy Institute, 44403 Kaunas, Lithuania
Justas Eimontas: Laboratory of Combustion Processes, Lithuanian Energy Institute, 44403 Kaunas, Lithuania
Nerijus Striūgas: Laboratory of Combustion Processes, Lithuanian Energy Institute, 44403 Kaunas, Lithuania
Adolfas Jančauskas: Laboratory of Combustion Processes, Lithuanian Energy Institute, 44403 Kaunas, Lithuania

Energies, 2025, vol. 18, issue 22, 1-17

Abstract: The European industries are transitioning from natural gas usage to renewable gases to enhance climate neutrality and energy security—therefore, hydrogen and ammonia gases could be great alternatives to natural gas. Hydrogen can be produced via electrolysis powered by renewable energy or from natural gas with carbon capture. Moreover, ammonia, composed of hydrogen and nitrogen, could also act as an energy carrier and storage medium. This study investigates the combustion process and efficiency of the hydrogen-enriched NH 3 and CH 4 blends using nonthermal plasma assistance. The experiments were performed with a gas burner with a thermal power of 1.30 kW using fully premixed gas blends. The nonthermal plasma was created with a high-voltage and high-frequency generator at 120 kHz and 8.33 kV. Time-resolved chemiluminescence data for OH* and NH 2 * were captured using an ICCD camera, an MIR emission spectrometer and a thermal irradiance flux meter. The results indicated that nonthermal plasma enhances the flame stability and increases the infrared radiation intensity. The MIR spectroscopy showed an intensity increase of 13% for ammonia-hydrogen blends under plasma assistance and heat flux measurements showed a 15% increase for the 70% ammonia and 20% hydrogen mixture. These results demonstrate that plasma-assisted combustion can enhance the efficiency and stability of low-carbon fuel blends, facilitating their integration into current infrastructure while reducing greenhouse gas emissions.

Keywords: hydrogen; ammonia; plasma-assisted combustion; renewable gases; flame stability; combustion efficiency; infrared radiation; heat flux (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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