Flame Structure at Elevated Pressure Values and Reduced Reaction Mechanisms for the Combustion of CH 4 /H 2 Mixtures

Ilya E. Gerasimov, Tatyana A. Bolshova, Ksenia N. Osipova, Artëm M. Dmitriev (), Denis A. Knyazkov () and Andrey G. Shmakov
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Ilya E. Gerasimov: Voevodsky Institute of Chemical Kinetics and Combustion SB RAS, Novosibirsk 630090, Russia
Tatyana A. Bolshova: Voevodsky Institute of Chemical Kinetics and Combustion SB RAS, Novosibirsk 630090, Russia
Ksenia N. Osipova: Voevodsky Institute of Chemical Kinetics and Combustion SB RAS, Novosibirsk 630090, Russia
Artëm M. Dmitriev: Voevodsky Institute of Chemical Kinetics and Combustion SB RAS, Novosibirsk 630090, Russia
Denis A. Knyazkov: Voevodsky Institute of Chemical Kinetics and Combustion SB RAS, Novosibirsk 630090, Russia
Andrey G. Shmakov: Voevodsky Institute of Chemical Kinetics and Combustion SB RAS, Novosibirsk 630090, Russia

Energies, 2023, vol. 16, issue 22, 1-30

Abstract: Understanding and controlling the combustion of clean and efficient fuel blends, like methane + hydrogen, is essential for optimizing energy production processes and minimizing environmental impacts. To extend the available experimental database on CH 4 + H 2 flame speciation, this paper reports novel measurement data on the chemical structure of laminar premixed burner-stabilized CH 4 /H 2 /O 2 /Ar flames. The experiments cover various equivalence ratios (φ = 0.8 and φ = 1.2), hydrogen content amounts in the CH 4 /H 2 blend (X H2 = 25%, 50% and 75%), and different pressures (1, 3 and 5 atm). The flame-sampling molecular-beam mass spectrometry (MBMS) technique was used to detect reactants, major products, and several combustion intermediates, including major flame radicals. Starting with the detailed model AramcoMech 2.0, two reduced kinetic mechanisms with different levels of detail for the combustion of CH 4 /H 2 blends are reported: RMech1 (30 species and 70 reactions) and RMech2 (21 species and 31 reactions). Validated against the literature data for laminar burning velocity and ignition delays, these mechanisms were demonstrated to reasonably predict the effect of pressure and hydrogen content in the mixture on the peak mole fractions of intermediates and adequately describe the new data for the structure of fuel-lean flames, which are relevant to gas turbine conditions.

Keywords: methane; hydrogen; hythane; flame structure; flame radicals; flame chemical speciation; molecular-beam mass spectrometry; kinetic mechanism; reduced mechanism; mechanism development (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: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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