On explosion characteristics of premixed syngas/air mixtures with different hydrogen volume fractions and ignition positions

Yao, Zhifeng; Deng, Haoxin; Dong, Jianfei; Wen, Xiaoping; Zhang, Xinmin; Wang, Fahui; Chen, Guoyan

doi:10.1016/j.fuel.2020.119619

Cited by 30 publications

(14 citation statements)

References 42 publications

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“…With an increase of N 2 content, the ability of R36 and R43 to reduce free radicals was stronger than that of CO 2 . This may be due to the chemical effects of direct participation of N 2 in the reaction. − …”

Section: Resultsmentioning

confidence: 99%

Numerical Simulations of the Influence of Inert Gases (N₂/CO₂) on Combustion Characteristics of Laminar-Premixed Biosyngas Flame

Sun

Huang

et al. 2021

ACS Omega

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In this work, the influence of different N2/CO2 contents (up to 60% in fuel volume) on combustion features of laminar-premixed CO/CH4/H2 flame with various equivalence ratios (0.6–1.6) at standard conditions was numerically calculated using ANSYS CHEMKIN-PRO with the GRI-Mech 3.0 mechanism. The mole fraction profiles of the major species and the rate of production of dominant elementary reactions in the flames of CO/CH4/H2/N2/CO2/air were obtained. The effect of inert gas addition on the formation of NO X , H, O, and OH was analyzed, and the sensitivity coefficient of the active radical mole fraction was obtained. The results suggest that the addition of inert gas of the fuel mixture with various equivalence ratios reduces laminar burning velocity and adiabatic temperature, which have always had a good positive correlation and the maximum peak point shifted left. CO2 has obvious inhibitory effect on the formation of NO by reducing the amount of O radicals and obstructing the conduct of the reaction of NNH + O ⇔ NH + NO, but it promotes the formation of NO2 mainly through the reaction HO2 + NO ⇔ NO2 + OH. The reactions H + O2 + H2O ⇔ HO2 + H2O, H + O2 ⇔ O + OH, and OH + CO ⇔ H + CO2 are three very important reactions for the molar fractions of H, O, and OH that decrease significantly with an increase of inert gas concentration.

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Section: Resultsmentioning

confidence: 99%

Numerical Simulations of the Influence of Inert Gases (N₂/CO₂) on Combustion Characteristics of Laminar-Premixed Biosyngas Flame

Sun

Huang

et al. 2021

ACS Omega

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“…If ignition occurs at the same location, flame propagation velocity, overpressure growth rate, and maximum overpressure increase with the increase of hydrogen volume fraction in the syngas. Equivalence ratio is mainly affected flame instability and flame burning speed. , …”

Section: Flame Propagation Characteristics Of Hph–air Mixturesmentioning

confidence: 99%

Minireview on the Leakage Ignition and Flame Propagation Characteristics of Hydrogen: Advances and Perspectives

Wang

Zhao

et al. 2023

Energy Fuels

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Hydrogen energy is a clean and efficient type of green energy whose use has been widely promoted. However, because of its physical and chemical characteristics, hydrogen tends to cause fires and explosions under certain conditions, which restricts its widespread application. After briefly describing the danger of high-pressure hydrogen (HPH), this paper summarizes the ignition and flame propagation characteristics of HPH leakage diffusion and describes the influences of various factors, such as leakage location, initial leakage velocity, initial pressure, presence of vents, ignition location, pipe size, and presence of obstacles, on these characteristics. HPH is likely to ignite spontaneously at the moment of leakage, and this ignition involves complex dynamics. Finally, the gap in the current research on HPH is described, and suggestions are provided for future research to promote the safe and efficient use of hydrogen energy.

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“…Technology of biomass-derived syngas, low quality biomass energy can be converted into combustible gas with high calorific value, it has high potential in future energy development, reduced consumption of fossil fuels [1] .But, in the transportation process, the biomass-derived syngas often leakage [2,3] , because it contains more CO,H 2 ,CH 4 and other flammable gases, it is liable to explode when exposed to the open flame and becoming very dangerous [4,5] .Therefore, the burning characteristics of biomass-derived syngas are of great significance.…”

Section: Introductionmentioning

confidence: 99%

The content of hydrogen to the effect on the combustion characteristics of biomass-derived syngas

et al. 2022

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Biomass-derived syngas is prone to leakage during transportation. To safely use biomass-derived syngas, we need to study the combustion characteristics of material syngas the purpose of this paper is:at T = 303 k, P = 0.1 MPa, under the condition of the spherical expansion flame method, calculate the laminar burning velocity, and used the Chemkin module of ANSYS to simulate four mechanisms(GRI-3.0?FFCM-1?Li-2015?San Diego +NOX-2018) to compare, select more appropriate reaction mechanism through experimental data for related research. It was found that the chemical reaction mechanism of GRI-3.0 is more in line with the experimental results. It is found that the experimental results are in good agreement with the linear extrapolation method. When the H2concentration increases from 22% to 42%, the peak laminar burning velocity moves in the direction of the lean fuel side. When the H2concentration increases to42%, the laminar burning velocity is the fastest, reaching 0.78m/s.The effect of H2on thermal diffusivity is high. When H2concentration reaches 42%, its thermal diffusivity is much higher than other gas components. The adiabatic flame temperature of F1 (22% H2,45% CO, 9.6% CH4, 23.4% CO2)-air mixtures is the highest, approaching 2196K. The peak adiabatic flame temperature of F5(42% H2, 25% CO, 9.6% CH4, 23.4% CO2)-air mixtures is 2082K, which is comparatively low. Nonetheless, the H2concentration in F5-airmixturesis higher than that inF1-airmixtures, indicating that H2has less influence on adiabatic flame temperature than CO. The positive reactions to accelerate laminar burning velocity mainly include R99, R38 and R46. R52 and R35 can inhibit laminar burning velocity. There are many factors affecting laminar burning velocity, among which high reactive free radicals are the main factors, and the competition between chain branching reaction and chain termination reaction for high reactive free radicals also affects laminar burning velocity. With the increase of concentration of H2, participate in the reaction of the molar mass fraction of highly reactive free radicals and the laminar burning velocity.

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On explosion characteristics of premixed syngas/air mixtures with different hydrogen volume fractions and ignition positions

Cited by 30 publications

References 42 publications

Numerical Simulations of the Influence of Inert Gases (N₂/CO₂) on Combustion Characteristics of Laminar-Premixed Biosyngas Flame

Numerical Simulations of the Influence of Inert Gases (N₂/CO₂) on Combustion Characteristics of Laminar-Premixed Biosyngas Flame

Minireview on the Leakage Ignition and Flame Propagation Characteristics of Hydrogen: Advances and Perspectives

The content of hydrogen to the effect on the combustion characteristics of biomass-derived syngas

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On explosion characteristics of premixed syngas/air mixtures with different hydrogen volume fractions and ignition positions

Cited by 30 publications

References 42 publications

Numerical Simulations of the Influence of Inert Gases (N2/CO2) on Combustion Characteristics of Laminar-Premixed Biosyngas Flame

Numerical Simulations of the Influence of Inert Gases (N2/CO2) on Combustion Characteristics of Laminar-Premixed Biosyngas Flame

Minireview on the Leakage Ignition and Flame Propagation Characteristics of Hydrogen: Advances and Perspectives

The content of hydrogen to the effect on the combustion characteristics of biomass-derived syngas

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Product

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Numerical Simulations of the Influence of Inert Gases (N₂/CO₂) on Combustion Characteristics of Laminar-Premixed Biosyngas Flame

Numerical Simulations of the Influence of Inert Gases (N₂/CO₂) on Combustion Characteristics of Laminar-Premixed Biosyngas Flame