Combustion characteristics of primary reference fuels with hydrogen addition

Luo, Minye; Liu, Dong

doi:10.1016/j.ijhydene.2016.04.107

Cited by 26 publications

(2 citation statements)

References 45 publications

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“…To better compare the addition effects of hydrogen and ammonia on PAHs and soot formation, it is important to isolate these effects individually. − The gas-phase mechanism can have fictitious species added to it to separate the chemical and the dilution and thermal effects. − In an ethylene laminar diffusion flame, Li et al looked into the effects of ammonia and hydrogen addition on soot morphology and nanostructure. By keeping the equivalency and dilution ratios constant, they were able to separate the chemical impacts from the dilution and thermal effects, and they were able to maintain nearly constant maximum flame temperatures across all tested flames.…”

Section: Introductionmentioning

confidence: 99%

H₂/NH₃ Addition Effects on Flame Characteristics and Soot Formation in Ethylene Inverse Diffusion Flame

Zhang

Chu

et al. 2023

Energy Fuels

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Zero-carbon alternative fuels such as hydrogen and ammonia are gaining popularity. Blending these fuels with hydrocarbons is an intermediate approach to mitigate soot and carbon dioxide production. Recent studies have concentrated their attention to the effects of ammonia and hydrogen on the soot production of hydrocarbon fuels. It is still necessary to completely comprehend how this influence is dependent on the type of fuel and flame configuration. In this work, the effect of hydrogen and ammonia addition on soot production in ethylene laminar inverse diffusion flames (IDF) was numerically examined for the first time. The thermal, chemical, and combined effects of hydrogen and ammonia were assessed by fictitious species. The experimental results from the literature were used to validate the temperature and soot volume fraction profiles. Results indicated that the flame temperature and the production of radicals are promoted chemically by hydrogen addition but inhibited under the thermal effect of ammonia. The principal source of the reduction in OH-represented flame height, soot volume fraction, average diameter, and primary particle number density in the IDF is the thermal effect of additives, and hydrogen addition performs better than ammonia. The major and intermediate species, the aromatic hydrocarbons, and the soot formation or oxidation reaction rates are decreased mainly by the hydrogen and ammonia thermal effect while increased moderately by the chemical effect. Therein, the reduction in soot generation is mainly due to the polycyclic aromatic hydrocarbon condensation rate being slowed down by additives. The inhibition is attributed to the thermal effect of additions, and hydrogen behaves better than ammonia.

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Section: Introductionmentioning

confidence: 99%

H₂/NH₃ Addition Effects on Flame Characteristics and Soot Formation in Ethylene Inverse Diffusion Flame

Zhang

Chu

et al. 2023

Energy Fuels

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“…Natural gas and diesel are both complex mixtures composed of many different species, which makes it difficult to perform the kinetic studies for the real fuel mixtures. Consequently, surrogate fuel models are proposed to make it possible to study the chemical kinetics of the complex mixtures. − As the main component of natural gas, methane is always used as the representative of natural gas, , while n -heptane is considered as a single surrogate of diesel because of their similar cetane numbers and low temperature ignition behavior. − Thus, in the present study, the methane/ n -heptane mixture is selected as the surrogate model of natural gas–diesel dual-fuel to understand the kinetic coupling between natural gas and diesel at low and high temperature.…”

Section: Introductionmentioning

confidence: 99%

Kinetic Effects of n-Heptane Addition on Low and High Temperature Oxidation of Methane in a Jet-Stirred Reactor

et al. 2018

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The kinetic effects of n-heptane addition on low and high temperature oxidations of methane were experimentally investigated over a range of temperatures from 800 to 1200 K, at the equivalence ratio of 0.5 in an atmospheric jet-stirred reactor (JSR). The n-heptane content in the methane/n-heptane mixture was varied between 0 and 100%. The mole fractions of CH4, nC7H16, O2, CO, CO2, CH2O, and C2H4 were determined respectively in the present experiments, and the NUI mechanism was employed to perform the numerical studies under the same conditions by using the perfectly stirred reactor model. The results show that the onset temperature of the oxidation of methane decreases with the increase of the n-heptane content in methane/n-heptane mixture significantly, and that even a small amount of n-heptane can cause an obvious shift of high temperature oxidation of methane to lower temperature. According to the reaction path analysis, the initial kinetic enhancement reactions of n-heptane in the oxidation of methane are identified. It is shown that the kinetic enhancement of methane oxidation by n-heptane addition increases at low temperature. The sensitivity analysis of the mole fraction of methane indicate that the methane oxidation is mainly sensitive to those relevant reactions involving OH, HO2, and other radicals produced by n-heptane at low temperature, and especially at low n-heptane content through the radical pool enrichment. The present study indicates the potential of n-heptane-assisted methane combustion in diesel and marine engine applications.

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Coupled chemical effects of carbon dioxide and hydrogen additions on premixed lean dimethyl ether flames

Pan

Liu

2016

Sci. China Technol. Sci.

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Combustion characteristics of primary reference fuels with hydrogen addition

Cited by 26 publications

References 45 publications

H₂/NH₃ Addition Effects on Flame Characteristics and Soot Formation in Ethylene Inverse Diffusion Flame

H₂/NH₃ Addition Effects on Flame Characteristics and Soot Formation in Ethylene Inverse Diffusion Flame

Kinetic Effects of n-Heptane Addition on Low and High Temperature Oxidation of Methane in a Jet-Stirred Reactor

Coupled chemical effects of carbon dioxide and hydrogen additions on premixed lean dimethyl ether flames

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Combustion characteristics of primary reference fuels with hydrogen addition

Cited by 26 publications

References 45 publications

H2/NH3 Addition Effects on Flame Characteristics and Soot Formation in Ethylene Inverse Diffusion Flame

H2/NH3 Addition Effects on Flame Characteristics and Soot Formation in Ethylene Inverse Diffusion Flame

Kinetic Effects of n-Heptane Addition on Low and High Temperature Oxidation of Methane in a Jet-Stirred Reactor

Coupled chemical effects of carbon dioxide and hydrogen additions on premixed lean dimethyl ether flames

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H₂/NH₃ Addition Effects on Flame Characteristics and Soot Formation in Ethylene Inverse Diffusion Flame

H₂/NH₃ Addition Effects on Flame Characteristics and Soot Formation in Ethylene Inverse Diffusion Flame