Experimental assessment of the sudden-reversal of the oxygen dilution effect on soot production in coflow ethylene flames

Wang, Qianlong; Legros, Guillaume; Bonnety, Jérôme; Morin, Céline; Matynia, Alexis; Consalvi, Jean-Louis; Liu, Fengshan

doi:10.1016/j.combustflame.2017.05.001

Cited by 32 publications

(29 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This paper presents an extension of the soot-radiation analysis earlier published in Refs. We agree with the reviewer that this article is an extended discussion of our previous works [15,16]. That is the reason why the title is the same as the one of Ref.15.…”

Section: Answers To Reviewer #2supporting

confidence: 77%

See 1 more Smart Citation

Experimental assessment of the sudden-reversal of the oxygen dilution effect on soot production in coflow ethylene flames II: soot radiation and flame transition analysis

Wang

Consalvi

Morin

et al. 2020

Journal of Quantitative Spectroscopy and Radiative Transfer

Self Cite

View full text Add to dashboard Cite

HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

show abstract

Section: Answers To Reviewer #2supporting

confidence: 77%

“…In Ref. 16, the cross-section integrated soot volume peaks were plotted to the corresponding oxygen/nitrogen fraction, whereas the peaks of soot radiative loss R v (every profile in Fig. 4) were plotted to the corresponding oxygen/nitrogen fraction in the Fig.…”

Section: Answers To Reviewer #2mentioning

confidence: 99%

Experimental assessment of the sudden-reversal of the oxygen dilution effect on soot production in coflow ethylene flames II: soot radiation and flame transition analysis

Wang

Consalvi

Morin

et al. 2020

Journal of Quantitative Spectroscopy and Radiative Transfer

Self Cite

View full text Add to dashboard Cite

show abstract

“…Note that the effect of oxygen concentration on soot formation characteristics have also been widely investigated in coflow diffusion flames [52][53][54][55][56], indicating the importance of this topic. In particular, several investigations [57][58][59] have demonstrated the non-monotonic variation of soot production as increasing level of fuel stream partial premixing was applied.…”

Section: Introductionmentioning

confidence: 99%

Experimental and soot modeling studies of ethylene counterflow diffusion flames: Non-monotonic influence of the oxidizer composition on soot formation

Yan

Zhou

et al. 2018

Combustion and Flame

View full text Add to dashboard Cite

Chung SH (2018) Experimental and soot modeling studies of ethylene counterflow diffusion flames: Non-monotonic influence of the oxidizer composition on soot formation. Combustion and Flame 197: 304-318. Available: http:// dx. AbstractPrevious soot studies in counterflow diffusion flames revealed that the sooting limit curve in regions with large oxygen mole fractions (XO) exhibited marked bending behaviors that indicated a non-monotonic variation of sooting tendency with oxygen concentration. The underlying mechanisms of this bending behavior remained unclear. In this regard, the present study systematically investigated the effect of oxygen mole fraction in the oxidizer stream on the sooting characteristics of ethylene counterflow diffusion flames. We used the near-infrared light extinction technique to measure the soot volume fractions of two types of flames that significantly differed in sooting structures: soot formation oxidation (SFO) flames with a fixed fuel mole fraction (XF) of 0.28 and varying XO between 0.5 and 1.0 and soot formation (SF) flames with pure ethylene (XF = 1.0) in the fuel stream and varied XO from 0.250.3. We also conducted detailed soot modeling studies by combining the gas-phase chemistry with a sectional soot model that accounted for soot inception, soot mass growth, particle coagulation as well as soot oxidation. Our experimental and modeling results demonstrated the non-monotonic relationship between the soot volume fractions with XO in SFO flames. A detailed analysis of the evolutionary process of soot formation revealed that the suppression of soot inception and the enhancement of the soot oxidation process with increasing XO led to a reduction of soot volume fraction. On the contrary, the surface growth rates increased with XO, resulting in an increase in soot mass concentration. These competing effects led to the nonmonotonic variation of soot volume fractions with XO for SFO flames. On the other hand, in SF flames the inception and surface growth of soot both increased as XO increased, resulting in the observed monotonic relationship between soot volume fraction and XO. We also analyzed the soot zone structures and made comparisons between SFO and SF flames.

show abstract

“…Oxygen enrichment, which may be used to increase the peak-flame temperature, decrease flue gas losses, or reduce equipment size, is applied in some industrial applications (e.g., glass manufacturing and aluminum recycling) and in oxy-fuel combustion for carbon capture. Several studies have investigated oxygen-enriched combustion for co-flowing diffusion flames experimentally [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33], and many have noted a significant increase in soot formation when the oxygen content in the oxidizer was increased (due to higher temperatures and reaction rates). As for the impact of pressure on soot formation in laminar flames, the soot volume fraction appears to scale in proportion to the total pressure in terms of a power-law, i.e., ∝ P n .…”

Section: Introductionmentioning

confidence: 99%

Formation of Soot in Oxygen-Enriched Turbulent Propane Flames at the Technical Scale

et al. 2020

View full text Add to dashboard Cite

Soot is an important component for heat transfer in combustion processes. However, it is also a harmful pollutant for humans, and strict emissions legislation motivates research on how to control soot formation and release. The formation of soot is known to be triggered by high temperature and high pressure during combustion, and it is also strongly influenced by the local stoichiometry. The current study investigates how the formation of soot is affected by increasing the oxygen concentration in the oxidizer, since this affects both the temperature profile and partial pressures of reactants. The oxygen-to-fuel ratio is kept constant, i.e., the total flow rate of the oxidizer decreases with increasing oxygen concentration. Propane is combusted (80 kWth) while applying oxygen-enriched air, and in-flame measurements of the temperature and gas concentrations are performed and combined with available soot measurements. The results show that increasing the oxygen concentration in the oxidizer from 21% to 27% slightly increases soot formation, due to higher temperatures or the lower momentum of the oxidizer. At 30% oxygen, however, soot formation increases by orders of magnitude. Detailed reaction modeling is performed and the increase in soot formation is captured by the model. Both the soot inception rates and surface growth rates are significantly increased by the changes in combustion conditions, with the increase in soot inception being the most important. Under atmospheric conditions, there is a distinct threshold for soot formation at around 1200 °C for equivalence ratios >3. The increase in temperature, and the slower mixing that results from the lower momentum of the oxidizer, have the potential to push the combustion conditions over this threshold when the oxygen concentration is increased.

show abstract

Experimental assessment of the sudden-reversal of the oxygen dilution effect on soot production in coflow ethylene flames

Cited by 32 publications

References 35 publications

Experimental assessment of the sudden-reversal of the oxygen dilution effect on soot production in coflow ethylene flames II: soot radiation and flame transition analysis

Experimental assessment of the sudden-reversal of the oxygen dilution effect on soot production in coflow ethylene flames II: soot radiation and flame transition analysis

Experimental and soot modeling studies of ethylene counterflow diffusion flames: Non-monotonic influence of the oxidizer composition on soot formation

Formation of Soot in Oxygen-Enriched Turbulent Propane Flames at the Technical Scale

Contact Info

Product

Resources

About