Large-eddy simulation and experimental study of a partially premixed hydrogen / air swirled burner: impact of the injection system - IFPEN - IFP Energies nouvelles Access content directly
Conference Papers Year : 2024

Large-eddy simulation and experimental study of a partially premixed hydrogen / air swirled burner: impact of the injection system

Abstract

Hydrogen-powered combustion devices (boilers, burners) and associated equipment (ignition and flame detection devices, gaskets, etc.) will have to comply with the same safety requirements, energy performance and pollutant emission thresholds as those set by regulations applicable to appliances fuelled by natural gas. Hydrogen combustion however suffers from flame stability and flashback issues, due to its large flame speed and low minimum ignition energy. This makes the use of hydrogen more challenging than natural gas. This study follows previous works dedicated to premixed H2/CH4/air combustion in swirled and/or bluff-body flows, where the main difficulty concerns flashback, which often limits the mass quantity of hydrogen substituted for methane. To control flashback, two solutions are considered. The first is to operate in a non-premixed flame regime, but this solution generates the largest NO emissions. Nevertheless, it guarantees the prevention of flashbacks. The second solution is to operate in a partially premixed regime. Here, the goal is to achieve optimal mixing between the fuel and air in a very short time and at the smallest distance. If this mixing condition is met, the combustion will produce minimal nitrogen monoxide (NOx) akin to fully premixed combustion, with the benefit of avoiding any flashback. The objective of this study is to assess the impact of the hydrogen-air mixture quality in a swirled bluff-body burner with modifiable injection geometry, on the topology of the stabilized flames as well as on pollutant formation. Comparisons of results from large-eddy simulations with measurements allow to validate the results, in terms of aerodynamic field, flame shape and position. Further analysis of the LES results show that the centripetal injection yields a more uniform air/hydrogen mixture. This also leads to a reduction in the maximum temperature, subsequently contributing to lower emissions of NOx.
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Dates and versions

hal-04571257 , version 1 (07-05-2024)

Identifiers

  • HAL Id : hal-04571257 , version 1

Cite

Karine Truffin, Paul-Georgian Luca, Tran Ngoc Duc Ho, Justin Bertsch, Giampaolo Maio, et al.. Large-eddy simulation and experimental study of a partially premixed hydrogen / air swirled burner: impact of the injection system. INFUB-14,European Conference on Industrial Furnaces and Boilers, Apr 2024, Algarve, Portugal. ⟨hal-04571257⟩
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