Study of CH 4 –H 2 Gas Combustion in Air Enriched with Oxygen Through Ozone Injection

Lucian Mihaescu, Elena Pop (), Ionel Pisa, Dorel Stoica and Rodica Manuela Grigoriu
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Lucian Mihaescu: Faculty of Mechanical Engineering and Mechatronics, National University of Science and Technology POLITEHNICA Bucharest, 060042 Bucharest, Romania
Elena Pop: Faculty of Mechanical Engineering and Mechatronics, National University of Science and Technology POLITEHNICA Bucharest, 060042 Bucharest, Romania
Ionel Pisa: Faculty of Mechanical Engineering and Mechatronics, National University of Science and Technology POLITEHNICA Bucharest, 060042 Bucharest, Romania
Dorel Stoica: Faculty of Biotechnical Systems Engineering, National University of Science and Technology POLITEHNICA Bucharest, 060042 Bucharest, Romania
Rodica Manuela Grigoriu: Faculty of Power Engineering, National University of Science and Technology POLITEHNICA Bucharest, 060042 Bucharest, Romania

Energies, 2025, vol. 18, issue 19, 1-14

Abstract: This study investigates the combustion behavior of H 2 –CH 4 mixtures with oxygen-enriched air, achieved through injecting ozone (O 3 ) into the air intake of the burner fan. The motivation for this approach lies in the high reactivity of hydrogen compared to methane, with the aim of promoting a more favorable oxidizing environment for overall combustion. The research combines theoretical analysis with experimental validation using a diffusion-type burner operating at a fuel flow rate of 1.2 Nm 3 /h. For this flow rate, the ozone injection led to an equivalent O 2 concentration of approximately 21.7%. At this enrichment level, flame temperature was calculated to increase by 70–90 °C. The burner was specifically designed for the diffusion combustion of H 2 –CH 4 mixtures and features three fuel injection nozzles, each surrounded by five air inlets. Experiments employed premixed H 2 -CH 4 gas cylinders (Linde) with hydrogen concentrations of 20% and 30%, respectively. The results confirmed slight combustion intensification due to elevated oxygen concentration, with no issues related to flame stability or pulsations observed. Core flame temperature and flue gas emissions, including CO 2 , were measured. The results support the further development of this combustion technology by increasing the allowable oxygen concentration limit.

Keywords: combustion; gaseous fuel; pilot burner; ozone injection (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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