The Effect of Hydrogen Peroxide on NH 3 /O 2 Counterflow Diffusion Flames

Wenkai Yang, Ashraf N. Al Khateeb and Dimitrios C. Kyritsis
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Wenkai Yang: Department of Mechanical Engineering, Khalifa University of Science and Technology, Abu Dhabi P.O. Box 127788, United Arab Emirates
Ashraf N. Al Khateeb: Department of Aerospace Engineering, Khalifa University of Science and Technology, Abu Dhabi P.O. Box 127788, United Arab Emirates
Dimitrios C. Kyritsis: Department of Mechanical Engineering, Khalifa University of Science and Technology, Abu Dhabi P.O. Box 127788, United Arab Emirates

Energies, 2022, vol. 15, issue 6, 1-17

Abstract: The impact of adding H 2 O 2 in the fuel stream on the structure of non-premixed opposed-flow NH 3 /O 2 flames was investigated numerically using a verified computational tool and validated mechanism. The results illustrate the dual role of the added H 2 O 2 within the fuel jet. A small amount of H 2 O 2 within the NH 3 stream acted as a fuel additive that enhanced the reaction rate via reducing the kinetic time scale. However, a novel flame structure appeared when the H 2 O 2 mole fraction within the fuel stream increased to χ H 2 O 2 > 16%. Unlike the pure NH 3 /O 2 flame, a premixed reaction zone was discerned on the fuel side, in which H 2 O 2 reacts with NH 3 and played the role of an oxidizer. Then, the remaining NH 3 that survived premixed combustion continues reacting with O 2 and forms a non-premixed flame. As a result of this structure, it was shown that the well-established conclusion of “near-equilibrium” non-premixed flame analysis in which the strain on the flame is determined by the momentum fluxes of the counter-flowing streams does not hold for the flames that were studied in this paper. It was also shown that when H 2 O 2 acted as an oxidizer, it produced substantial amounts of HO 2 , which allowed for low-temperature formation of NO 2 through the reaction of NO with HO 2 .

Keywords: ammonia; laminar flames; hydrogen peroxide; maritime transport (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: 2022
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