Experimental study of turbulent explosions in hydrogen enriched syngas related fuels

Li, T.; Hampp, Fabian; Lindstedt, R.P.

doi:10.1016/j.psep.2018.03.032

Cited by 30 publications

(18 citation statements)

References 43 publications

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“…The burner consists of two identical nozzles with an inner diameter D = 30 mm, nozzle length of L = 50 mm and nozzle separation of one D. The burner is operated in a back-to-burnt (BTB) configuration to accommodate the wide range of mixture reactivities. The configuration entails considerable advantages in the current context: (i) cases can be compared on a basis of nearly identical flow conditions [29], (ii) all fuel gases are combusted (a safety requirement for H 2 and CO containing mixtures) [5] as global extinction is prevented, (iii) the transition from self-sustained flame propagation to thermally supported burning can be assessed [24]…”

Section: Experimental Configurationmentioning

confidence: 99%

“…Decarbonisation by means of hydrogen substitution is most effective if hydrogen is produced from renewable energy sources. However, the variability of syngas compositions can lead to fuel flexibility problems for manufacturers [4] and the increased hydrogen concentration to safety concerns [5]. The syngas mixture reactivity is strongly dependent upon hydrogen content with direct implications on flame propagation speeds, explosion over-pressures, auto-ignition and turbulence-chemistry interactions.…”

Section: Introductionmentioning

confidence: 99%

“…The latter can lead to differences in flame surface area [6] and combustion instabilities [1,4]. Li et al [5] measured flame speeds and over-pressures generated in an obstructed flame tube for a wide range of binary and ternary H 2 , CO and CH 4 mixtures, with methane showing a stronger inhibiting effect on the mixture reactivity. Scaling based on the amount of air required to fully oxidise the mixture correlated the fuel composition impact on explosion over-pressures [5] and turbulent flow fields [7].…”

Section: Introductionmentioning

confidence: 99%

“…Li et al [5] measured flame speeds and over-pressures generated in an obstructed flame tube for a wide range of binary and ternary H 2 , CO and CH 4 mixtures, with methane showing a stronger inhibiting effect on the mixture reactivity. Scaling based on the amount of air required to fully oxidise the mixture correlated the fuel composition impact on explosion over-pressures [5] and turbulent flow fields [7]. Simatos et al [8] investigated the effect of H 2 content in lean (Φ = 0.80) binary CH 4 and CO fuel blends on auto-ignition in turbulent shear layers and the stronger inhibiting effect of CH 4 prevailed.…”

Section: Introductionmentioning

confidence: 99%

“…The turbulent burning velocity (S T ) is a key parameter required, for example, to evaluate the strength of explosions [5] and the flashback propensity in gas turbine engines [9]. Investigations seeking to correlate S T to the turbulence intensity are quite common [10].…”

Section: Introductionmentioning

confidence: 99%

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The reactivity of hydrogen enriched turbulent flames

Hampp

Goh

Lindstedt

2020

Process Safety and Environmental Protection

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The use of hydrogen enriched fuel blends, e.g. syngas, offers great potential in the decarbonisation of gas turbine technologies by substitution and expansion of the lean operating limit. Studies assessing explosion risks or laminar flame properties of such fuels are common. However, there is a lack of experimental data that quantifies the impact of hydrogen addition on turbulent flame parameters including burning velocities and scalar fluxes. Such properties are here determined for aerodynamically stabilised flames in a back-to-burnt opposed jet configuration featuring fractal grid generated multi-scale turbulence (Re t = 314 ± 19) using binary H 2 / CH 4 and H 2 / CO fuel blends. The binary H 2 / CH 4 fuel blend is varied from α = X H2 /(X H2 + X F ) = 0.0, 0.2 and 0.4 -1.0, in steps on 0.1, and the binary H 2 / CO fuel blend from α = 0.3 -1.0 also in steps of 0.1. The equivalence ratio is adjusted between the mixture specific lower limit of local flame extinction and the upper limit of flashback. The flames are characterised using PIV measurements combined with a flame front detection algorithm. The study quantifies the impact of hydrogen enrichment on (i) turbulent burning velocity (S T ), (ii) turbulent transport and (iii) the rate of strain acting on flame fronts. Scaling relations (iv) that correlate S T with laminar flame properties are evaluated and (v) flow field data that permits validation of computational models is provided. It is shown that CH 4 results in a stronger inhibiting effect on the reaction chemistry of H 2 compared to CO, that turbulent transport and burning velocities are strongly correlated with the rate of compressive strain and that scaling relationships can provide reasonable agreement with experiments.

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Section: Experimental Configurationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%