Hydrogen substitution of natural-gas in premixed burners and implications for blow-off and flashback limits

Aniello, A.; Poinsot, Thiérry; Selle, Laurent; Schuller, Thierry

doi:10.1016/j.ijhydene.2022.07.066

Cited by 31 publications

(11 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…where ṁh , ṁp , ρ u , N p , σ and A h are respectively the mass flow rate through a single hole, the mass flow rate through a patch (i.e. two holes and two slits) [5], the density of the preheated gases at T u , the total number of patches, the ratio of a hole surface over a patch surface, and the surface area at the outlet of a single hole.…”

Section: Burner Descriptionmentioning

confidence: 99%

“…Because of the heat exchange between the fresh gas and the hot metallic walls, the temperature of the combustible mixture T u flowing through the burner holes is higher than the inlet gas temperature T in = 300 K injected in the plenum. This temperature is here deduced by using the technique presented in [5,54]. The burner is first ignited at the targeted stable operating condition.…”

Section: Burner and Gas Temperature Measurementsmentioning

confidence: 99%

“…Hydrogen can later be either converted back to electricity through fuel cells or burnt directly. However, its strong reactivity makes the conversion of conventional burners to hydrogen challenging (see for example [5,6,7,8]), highlighting the need for innovative solutions [9,10].…”

Section: Introductionmentioning

confidence: 99%

“…This distance was found to be directly linked to the flame thickness [17,18]. For technologies powered by laminar flames stabilized on a perforated burner, hydrogen substitution results in higher wall temperatures, and therefore higher reactant gas temperatures [5,19]. This higher reactivity leads to a higher propensity to flashback inside the burner [14,20,21] which raises important safety issues.…”

Section: Introductionmentioning

confidence: 99%

“…In a recent study on the impact of hydrogen addition on flashback limits, the importance of the thermal state of the burner has also been stressed out [5].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Autoignition-induced flashback in hydrogen-enriched laminar premixed burners

Pers

Aniello

Morisseau³

et al. 2023

International Journal of Hydrogen Energy

Self Cite

View full text Add to dashboard Cite

Section: Burner Descriptionmentioning

confidence: 99%

Section: Burner and Gas Temperature Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…In a recent study on the impact of hydrogen addition on flashback limits, the importance of the thermal state of the burner has also been stressed out [5].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Autoignition-induced flashback in hydrogen-enriched laminar premixed burners

Pers

Aniello

Morisseau³

et al. 2023

International Journal of Hydrogen Energy

Self Cite

View full text Add to dashboard Cite

Spatiotemporal Surface Temperature Measurements Resolving Flame-Wall Interactions of Lean H2-Air and CH4-Air Flames Using Phosphor Thermometry

Ojo,

Padhiary,

Peterson

2024

Flow Turbulence Combust

View full text Add to dashboard Cite

Spatiotemporal wall temperature (Twall) distributions resulting from flame-wall interactions of lean H2-air and CH4-air flames are measured using phosphor thermometry. Such measurements are important to understand transient heat transfer and wall heat flux associated with various flame features. This is particularly true for hydrogen, which can exhibit a range of unique flame features associated with combustion instabilities. Experiments are performed within a two-wall passage, in an optically accessible chamber. The phosphor ScVO4:Bi3+ is used to measure Twall in a 22 × 22 mm2 region with 180 µm/pixel resolution and repetition rate of 1 kHz. Chemiluminescence imaging is combined with phosphor thermometry to correlate the spatiotemporal dynamics of the flame with the heat signatures imposed on the wall. Measurements are performed for lean H2-air flames with equivalence ratio Φ = 0.56 and compared to CH4-air flames with Φ = 1. Twall signatures for H2-air Φ = 0.56 exhibit alternating high and low-temperature vertical streaks associated with finger-like flame structures, while CH4-air flames exhibit larger scale wrinkling with identifiable crest/cusp regions that exhibit higher/lower wall temperatures, respectively. The underlying differences in flame morphology and Twall distributions observed between the CH4-air and lean H2-air mixtures are attributed to the differences in their Lewis number (CH4-air Φ = 1: Le = 0.94; H2-air Φ = 0.56: Le = 0.39). Findings are presented at two different passage spacings to study the increased wall heat loss with larger surface-area-to-volume ratios. Additional experiments are conducted for H2-air mixtures with Φ = 0.45, where flame propagation was slower and was more suitable to resolve the wall heat signatures associated with thermodiffusive instabilities. These unstable flame features impose similar wall heat fluxes as flames with 2–3 times greater flame power. In this study, these flame instabilities occur within a small space/time domain, but demonstrate the capability to impose appreciable heat fluxes on surfaces.

show abstract