Effects of hydrogen addition on soot formation and oxidation in laminar premixed C 2 H 2 /air flames

Park, Seul-Hyun; Lee, Ki-Man; Hwang, Cheol-Hong

doi:10.1016/j.ijhydene.2011.05.031

Cited by 76 publications

(26 citation statements)

References 23 publications

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“…The addition of non-or low-sooting tendency fuels in conventional hydrocarbons has long been regarded as a potential approach. Previous laboratory-scale studies demonstrated that the addition of hydrogen (H2) could inhibit soot formation in shock tubes [5][6][7][8], laminar premixed flames [9,10], coflow diffusion flames [11][12][13][14][15][16][17], as well as counterflow diffusion flames [18,19]. The suppression of soot emissions through the addition of H2 has also been reported under practical combustion conditions, such as in internal combustion engines [20][21][22] and turbulent non-premixed flames [23].…”

Section: Introductionmentioning

confidence: 95%

“…Helium (He), as an inert gas, has similar thermal and transport properties as H2 and consequently, the different soot-inhibiting effect between them is expected to be caused by the additional chemical effect of H2. Computationally, fictitious H2 (FH2) (defined to have the same physical properties with H2 but does not participate chemical reactions) has also been used for the isolation of the chemical effect of the addition of H2 [10,15].…”

Section: Introductionmentioning

confidence: 99%

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Chemical effects of hydrogen addition on soot formation in counterflow diffusion flames: Dependence on fuel type and oxidizer composition

Yan

Wang

et al. 2020

Combustion and Flame

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We experimentally studied and kinetically modeled the effects of hydrogen addition on soot formation in methane and ethylene counterflow diffusion flames (CDFs). To isolate the chemical effects of hydrogen in such flames, we also ran a set of experiments on flames of the same base fuels but with the addition of helium. Specifically, we measured the soot volume fractions of the flames using the planar laser-induced incandescence technique. We simulated detailed sooting structures by coupling the gas-phase chemistry with the polycyclic aromatic hydrocarbon (PAH)-based soot model, using a sectional method to resolve the soot particle dynamics. Our experimental and numerical results show that hydrogen chemically inhibits soot formation in ethylene CDFs. While in methane flames, it is interesting to observe that the difference in soot production between the hydrogen-and helium-doped cases became much smaller when the oxygen concentration in the oxidizer stream (XO) was reduced.This suggests that for methane CDFs the chemical soot-inhibiting effects of hydrogen was highly dependent on oxidizer composition (i.e., XO). Explanations are provided through detailed kinetic analysis concerning the effects of hydrogen addition on the growth of PAH, soot inception, and soot surface growth processes. Our results suggest that hydrogen's chemical role in soot formation not only depends on fuel type (ethylene or methane), it also may be sensitive to oxidizer composition.

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Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Chemical effects of hydrogen addition on soot formation in counterflow diffusion flames: Dependence on fuel type and oxidizer composition

Yan

Wang

et al. 2020

Combustion and Flame

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“…Hydrogen (H2) addition has been found to reduce particulates significantly both in open flame configurations [24,25,27] and combustion engines [32][33][34]. Previous studies exist which have used computational models to understand PAH growth mechanisms in hydrocarbon flames with H2 addition [26,35] . Guo et al [26] observed that H2 addition resulted in a reduction in PAHs through both dilution and chemical inhibition effects.…”

Section: Introductionmentioning

confidence: 99%

Study of polycyclic aromatic hydrocarbons (PAHs) in hydrogen-enriched methane diffusion flames

Ezenwajiaku

Talibi

Doan

et al. 2019

International Journal of Hydrogen Energy

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Polycyclic aromatic hydrocarbons (PAHs) are the carcinogenic components of soot. Detailed understanding of PAH formation characteristics is required for development of effective strategies to curtail PAH formation and reduce soot in combustion devices. This study presents an experimental methodology to analyse PAH formation characteristics of a non-premixed methane-air flame with and without hydrogen (H2) addition, using simultaneous planar laser induced fluorescence (PLIF) imaging of PAH and hydroxyl radical (OH). OH PLIF was used to represent peak temperature regions in the flame front. One-dimensional, opposed-jet laminar non-premixed flame simulations were also carried out for the same fuel mixture conditions. This work describes comparison of trends from both sets of studies. PAH fluorescence intensity values were observed to increase with increasing height above burner, however this rate of increase reduced with H2 addition. This observed rate of change in PAH fluorescence (that is, PAH growth characteristics) is indicative of the sooting potential of the fuel mixture. PAH fluorescence from experiments and PAH concentration from simulation show strong reduction with increase in H2 addition. The percentage reduction in PAH fluorescence signal with H2 addition closer to the burner tip was of a similar magnitude to that observed with flame simulations. The reduction in PAH with H2 addition could be attributed to the reduction in acetylene and propargyl concentrations, and reduced H-abstraction rates, which reduced the availability of active sites for PAH growth. The proposed experimental methodology for PAH measurements can be readily applied to any fuel mixtures.

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“…101,136,137 Syngas and H 2 -enriched fuels are regarded as the prominent alternative fuels for the future energy mix. [141][142][143][144][145] Moreover, the addition of even a small amount of H 2 to the fuel mixture can affect both the instantaneous and average characteristics of a turbulent premixed flame, 146 necessitating rigorous research on the combustion dynamics of such flames with varied fuel compositions. It has been reported that the addition of H 2 to hydrocarbons can reduce the soot formation and CO emissions drastically.…”

Section: Fuel-flexible Premixed Oxy-fuel Combustionmentioning

confidence: 99%

“…It has been reported that the addition of H 2 to hydrocarbons can reduce the soot formation and CO emissions drastically. [141][142][143][144][145] Moreover, the addition of even a small amount of H 2 to the fuel mixture can affect both the instantaneous and average characteristics of a turbulent premixed flame, 146 necessitating rigorous research on the combustion dynamics of such flames with varied fuel compositions.…”

Section: Fuel-flexible Premixed Oxy-fuel Combustionmentioning

confidence: 99%

Frontiers in combustion techniques and burner designs for emissions control and CO₂capture: A review

et al. 2019

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Summary The use of fossil fuel is expected to increase significantly by midcentury because of the large rise in the world energy demand despite the effective integration of renewable energies in the energy production sector. This increase, alongside with the development of stricter emission regulations, forced the manufacturers of combustion systems, especially gas turbines, to develop novel combustion techniques for the control of NOx and CO2 emissions, the latter being a greenhouse gas responsible for more than 60% to the global warming problem. The present review addresses different burner designs and combustion techniques for clean power production in gas turbines. Combustion and emission characteristics, flame instabilities, and solution techniques are presented, such as lean premixed air‐fuel (LPM) and premixed oxy‐fuel combustion techniques, and the combustor performance is compared for both cases. The fuel flexibility approach is also reviewed, as one of the combustion techniques for controlling emissions and reducing flame instabilities, focusing on the hydrogen‐enrichment and the integrated fuel‐flexible premixed oxy‐combustion approaches. State‐of‐the‐art burner designs for gas turbine combustion applications are reviewed in this study, including stagnation point reverse flow (SPRF) burner, dry low NOx (DLN) and dry low‐emission (DLE) burners, EnVironmental burners (including EV, AEV, and SEV burners), perforated plate (PP) burner, and micromixer (MM) burner. Special emphasis is made on the MM combustor technology, as one of the most recent advances in gas turbines for stable premixed flame operation with wide turndown and effective control of NOx emissions. Since the generation of pure oxygen is prerequisite to oxy‐combustion, oxygen‐separation membranes became of immense importance either for air separation for clean oxy‐combustion applications or for conversion/splitting of the effluent CO2 into useful chemical and energy products. The different carbon‐capture technologies, along with the most recent carbon‐utilization approaches towards CO2 emissions control, are also reviewed.

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Effects of hydrogen addition on soot formation and oxidation in laminar premixed C 2 H 2 /air flames

Cited by 76 publications

References 23 publications

Chemical effects of hydrogen addition on soot formation in counterflow diffusion flames: Dependence on fuel type and oxidizer composition

Chemical effects of hydrogen addition on soot formation in counterflow diffusion flames: Dependence on fuel type and oxidizer composition

Study of polycyclic aromatic hydrocarbons (PAHs) in hydrogen-enriched methane diffusion flames

Frontiers in combustion techniques and burner designs for emissions control and CO₂capture: A review

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Effects of hydrogen addition on soot formation and oxidation in laminar premixed C 2 H 2 /air flames

Cited by 76 publications

References 23 publications

Chemical effects of hydrogen addition on soot formation in counterflow diffusion flames: Dependence on fuel type and oxidizer composition

Chemical effects of hydrogen addition on soot formation in counterflow diffusion flames: Dependence on fuel type and oxidizer composition

Study of polycyclic aromatic hydrocarbons (PAHs) in hydrogen-enriched methane diffusion flames

Frontiers in combustion techniques and burner designs for emissions control and CO2capture: A review

Contact Info

Product

Resources

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Frontiers in combustion techniques and burner designs for emissions control and CO₂capture: A review