Investigation on dilution effect on laminar burning velocity of syngas premixed flames

Li, Hong‐Meng; Li, Guo-Xiu; Sun, Zuo-Yu; Zhou, Zi-Hang; Li, Yuan; Yuan, Ye

doi:10.1016/j.energy.2016.06.015

Cited by 48 publications

(9 citation statements)

References 36 publications

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“…33,39−41 A weak dependence of initial pressure on the laminar burning velocity was observed for H 2 −N 2 O mixtures by Bane et al, 23 who investigated both experimentally and numerically the propagation of explosion in these mixtures and by Razus et al, 42 This could be the explanation for a weak dependency of the laminar burning velocity on initial pressure. Li et al 43,44 and Zhang et al 45 investigated the dilution effect on the laminar burning velocity of syngas premixed flames, and a similar behavior about the dilution effect of CO 2 and N 2 was observed. For a given dilution, the laminar burning velocity under CO 2 dilution was lower than that under N 2 dilution.…”

Section: Laminar Burning Velocitymentioning

confidence: 70%

Propagation Characteristics of Stoichiometric Inert-Diluted Methane–N₂O Flames

Giurcan

Mitu

Movileanu

et al. 2022

Ind. Eng. Chem. Res.

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In this study, the laminar burning velocities of stoichiometric methane− nitrous oxide mixtures diluted with 50 vol % single inert (inert: argon, helium, or carbon dioxide) were determined from pressure−time records obtained in a spherical vessel centrally ignited, using a correlation based on the cubic law of pressure rise. The present experimental burning velocities are compared with literature data on stoichiometric methane−nitrous oxide mixtures diluted with nitrogen and with the calculated laminar burning velocities obtained by numerical modeling of their premixed flames. The computation was performed with the COSILAB package using the GRI 3.0 mechanism. Both data sets were used for examining the influence of initial pressure (0.5−1.75 bar) of stoichiometric inert-diluted methane−nitrous oxide mixtures on laminar burning velocities, maximum flame temperatures, heat release rates, and peak concentrations of main reaction intermediates. The baric coefficients of laminar burning velocities and overall reaction orders of methane oxidation with nitrous oxide were determined.

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Section: Laminar Burning Velocitymentioning

confidence: 70%

Propagation Characteristics of Stoichiometric Inert-Diluted Methane–N₂O Flames

Giurcan

Mitu

Movileanu

et al. 2022

Ind. Eng. Chem. Res.

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“…The decrease in burning velocity is due to an increase in heat capacity of the mixture due to CO 2 addition and a simultaneous decrease in thermal diffusivity of the mixture. The inhibiting effect on CO oxidation is further responsible for the reduction in burning velocity of CO 2 ‐diluted mixtures . The experimentally measured burning velocities for stoichiometric mixtures at 70% dilution disagree significantly with the Davis mechanism predictions.…”

Section: Resultsmentioning

confidence: 70%

Demarcation of reaction effects on laminar burning velocities of diluted syngas–air mixtures at elevated temperatures

Varghese

Kolekar

Kumar

2018

Int J of Chemical Kinetics

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Laminar burning velocities of CO2/N2 (60%, 70%) diluted H2/CO/air mixtures were measured at elevated temperatures using the externally heated diverging channel method. The computed burning velocities using the two reaction mechanisms (Davis et al., Proc. Combust. Inst. 2005;30(1):1283–1292; FFCM‐1, http://nanoenergy.stanford.edu/ffcm1) are compared with the experimentally determined burning velocities. The accuracy of the chemical kinetic mechanisms at high dilution rates and elevated temperatures was investigated for various hydrogen fractions in the fuel composition. The burning velocity is observed to increase at high temperatures due to higher mixture enthalpy. The dilution effect on the variation of laminar burning velocity was stronger for the CO2 dilution case compared to N2 dilution. A comparison between the FFCM‐1 mechanism and experimental measurements shows an accurate depiction of the reaction chemistry regarding the prediction of laminar burning velocities. The role of third‐body reactions and direct inhibiting effect of N2 and CO2 molecules on burning velocity of diluted syngas–air mixtures is analyzed in detail. Detailed kinetic analysis revealed that the use of GRI 3.0 collision efficiency factors in the Davis mechanism helps in accurately predicting the burning velocities at elevated temperatures and high CO2 dilution rates. The thermal effect dominates the reduction in laminar burning velocity for N2 dilution case. The FFCM‐1 mechanism agrees well with the experiments for syngas flames diluted with N2 compared to the Davis mechanism. The addition of third‐body efficiency of N2 in the FFCM‐1 mechanism improved the predictions of laminar burning velocities for the N2 dilution case.

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“…The GRI 3.0 has been validated for the chemical modeling of methane combustion and Nchemistry in various fields. 31,[35][36][37][38] The flame structure changes depending on the presence of impurities in the fuel, hydrogen content, and operating pressure. For systematic analysis, the established calculated conditions are presented in Table 1.…”

Section: Methodsmentioning

confidence: 99%

Numerical study of hydrogen effects on pressurized methane‐oxy combustion in counter‐flow diffusion flame

Park

Kim

Lee

2021

Intl J of Energy Research

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Hydrogen, a renewable energy source, is attracting interest because it does not emit the greenhouse gases and air pollutants generated by the use of fossil fuels. This study aims to analyze the effects of a hydrogen blend on pressurized oxy-fuel combustion (POFC) to support hydrogen infrastructure and reduce greenhouse gas emissions. A counter-flow diffusion flame model was used to analyze the characteristics of POFC. Purified and unpurified natural gas and

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Investigation on dilution effect on laminar burning velocity of syngas premixed flames

Cited by 48 publications

References 36 publications

Propagation Characteristics of Stoichiometric Inert-Diluted Methane–N₂O Flames

Propagation Characteristics of Stoichiometric Inert-Diluted Methane–N₂O Flames

Demarcation of reaction effects on laminar burning velocities of diluted syngas–air mixtures at elevated temperatures

Numerical study of hydrogen effects on pressurized methane‐oxy combustion in counter‐flow diffusion flame

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Investigation on dilution effect on laminar burning velocity of syngas premixed flames

Cited by 48 publications

References 36 publications

Propagation Characteristics of Stoichiometric Inert-Diluted Methane–N2O Flames

Propagation Characteristics of Stoichiometric Inert-Diluted Methane–N2O Flames

Demarcation of reaction effects on laminar burning velocities of diluted syngas–air mixtures at elevated temperatures

Numerical study of hydrogen effects on pressurized methane‐oxy combustion in counter‐flow diffusion flame

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Propagation Characteristics of Stoichiometric Inert-Diluted Methane–N₂O Flames

Propagation Characteristics of Stoichiometric Inert-Diluted Methane–N₂O Flames