Numerical Investigation of the Impact of H 2 Enrichment on Lean Biogas/Air Flames: An Analytical Modelling Approach

Filipe M. Quintino and Edgar C. Fernandes
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Filipe M. Quintino: Center IN+, Instituto Superior Técnico, University of Lisbon, 1049-001 Lisbon, Portugal
Edgar C. Fernandes: Center IN+, Instituto Superior Técnico, University of Lisbon, 1049-001 Lisbon, Portugal

Energies, 2021, vol. 14, issue 2, 1-17

Abstract: The transition from natural gas to renewable gases such as biogas and hydrogen creates an interchangeability challenge. The laminar flame speed S L is a critical parameter in appliance design as it is a unique characteristic of the flame mixture. It is thus essential to evaluate the impact of renewable gases on S L . In this work, 1D simulations were conducted in Cantera with the USC-Mech 2.0 kinetic mechanism. The S L of three base biogas blends (BG100, BG90 and BG80) was computed for H 2 enrichment up to 50% in volume, equivalence ratio 0.8 ≤ ? ≤ 1.0 , p = 1 atm and T u = 298 K. It was found that the effect of H 2 enrichment is higher for base blends with higher CO 2 content as the thermal-diffusive and dilution effects of carbon dioxide are mitigated by hydrogen. The introduction of H 2 also increases the H radical pool, which is linked with the increase in S L . A new correlation to model the impact of H 2 enrichment, S L ( x H 2 ) = ζ ( ? ) / S L ′ ( x C O 2 ) x H 2 e x H 2 + S L ′ ( x C O 2 ) , is proposed, which exhibits good agreement with the literature data and simulations. This equation can be directly used to estimate S L without the need for a priori adaptations of fit parameters as the contributions of CO 2 and H 2 are isolated in independent variables.

Keywords: biogas; hydrogen; laminar flame speed; premixed combustion; correlation (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: 2021
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Citations: View citations in EconPapers (1)

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