Experimental investigation on laminar burning velocities of ammonia/hydrogen/air mixtures at elevated temperatures

Lhuillier, Charles; Lamoureux, Nathalie; Contino, Francesco; Mounaïm‐Rousselle, Christine

doi:10.1016/j.fuel.2019.116653

Cited by 297 publications

(79 citation statements)

References 40 publications

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“…For low unstretched laminar burning velocity (<20 cm.s -1 ), radiative heat loss induced error can be of importance. Those effects were already addressed in [11]. In the present work, using the correlation of Yu et al [16], the worst case is obtained at 473 K, 3 bar where an underprediction of about 12% is calculated for neat ammonia corresponding to an absolute error of 1 cm/s.…”

Section: Experimental Set-up and Processingmentioning

confidence: 53%

“…The aim of the present work is thus twofold: 1) to extend laminar flame speed data already published in [11], in the case of NH3/H2 blend at higher pressure than atmospheric one, and also in the case of neat NH3 with enriched O2…”

Section: Introductionmentioning

confidence: 92%

“…The kinetic model used in this work follows our previous publication [4] and was revised to predict the new experimental data determined in this work and in our recent work [11] for the wide range of conditions. In this work, the reaction rate parameter of several reactions were updated based on the literature study.…”

Section: Kinetic Modelingmentioning

confidence: 99%

“…shows the new measured laminar flames speeds (symbols) compared against the model predictions using our previous work[4] and the model improvements from this work for NH3/H2/air at 473 K and 1[11] and 3 bar. Simulations were performed using a detailed multicomponent diffusion model to consider the strong thermo diffusion of the H and H2.…”

mentioning

confidence: 99%

“…All the simulations are performed with the LOGEresearch v1.10 [24] software suit. The model from this work is validated against 104 data sets of laminar flame speed measurements from different sources (32 data are from this work and 40 data (for NH3/H2) are from our recent work[11] and others are from published literature[2,5,7,10,[25][26][27][28][29][30][31][32]).…”

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confidence: 99%

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An experimental and modeling study of ammonia with enriched oxygen content and ammonia/hydrogen laminar flame speed at elevated pressure and temperature

Shrestha

Lhuillier

Barbosa

et al. 2021

Proceedings of the Combustion Institute

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340

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Laminar flame speeds of ammonia with oxygen-enriched air (oxygen content varying from 21-30 vol.%) and ammonia-hydrogen-air mixtures (fuel hydrogen content varying from 0-30 vol.%) at elevated pressure (1-10 bar) and temperature (298-473 K) were determined experimentally using a constant volume combustion chamber. Moreover, ammonia laminar flame speeds with helium as an inert were measured for the first time. Using these experimental data along with published ones, we have developed a newly compiled kinetic model for the prediction of the oxidation of ammonia and ammonia-hydrogen blends in freely propagating and burner stabilized premixed flames, as well as in shock tubes, rapid compression machines and a jet-stirred reactor. The reaction mechanism also considers the formation of nitrogen oxides, as well as the reduction of nitrogen oxides depending on the conditions of the surrounding gas phase. The experimental results from the present work and the literature are interpreted with the help of the kinetic model derived here. The experiments show that increasing the initial temperature, fuel hydrogen content, or oxidizer oxygen content causes the laminar flame speed to increase, while it decreases when increasing the initial pressure. The proposed kinetic model predicts the same trends than experiments and a good agreement is found with measurements for a wide range of conditions. The model suggests that under rich conditions the N2H2 formation path is favored compared to stoichiometric condition. The most important reactions under rich conditions are: NH2+NH=N2H2+H, NH2+NH2=N2H2+H2, N2H2+H=NNH+H2 and N2H2+M=NNH+H+M. These reactions were also found to be among the most sensitive reactions for predicting the laminar flame speed for all the cases investigated.

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Section: Experimental Set-up and Processingmentioning

confidence: 53%

Section: Introductionmentioning

confidence: 92%

Section: Kinetic Modelingmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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An experimental and modeling study of ammonia with enriched oxygen content and ammonia/hydrogen laminar flame speed at elevated pressure and temperature

Shrestha

Lhuillier

Barbosa

et al. 2021

Proceedings of the Combustion Institute

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340

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Effect of Intermediate Radicals on NO_x and De‐NO_x Characteristics of NH₃/H₂/Air Flames at High Pressure

et al. 2023

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The effect of NH, NH 2 , and HNO on NO x and De-NO x chemistry of a NH 3 /H 2 /air mixture at a pressure of 20 bar is investigated. Results suggest that the increase in pressure reduces NO x emissions and increases HO 2 radical production through the reaction H + O 2 (+M) HO 2 (+M). In contrast with OH and O radicals, the HO 2 radical is less reactive, which prevents NO formation. The fuelbound NO x emissions mainly depend on the reactions NH + OH NO + H, HNO(+M) NO + H(+M), HNO + OH NO + H 2 O, and HNO + O 2 NO + HO 2 , and thermal NO x depends on the reactions N + O 2 NO + N and N + OH NO + H. At a pressure of 20 bar, the N 2 O is further converted to NO 2 and N 2 through the reaction N 2 O + NO NO 2 + N 2 . The abundance of HO 2 radicals at high pressure also initiates the conversion of NO to NO 2 via the reaction NO + HO 2 NO 2 + H.

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Chemical kinetic analysis on influence of hydrogen enrichment on the combustion characteristics of ammonia air using newly proposed reaction model

Singh

Dash

Reddy

2021

Intl J of Energy Research

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Summary In recent years, ammonia has shown great potential for future green fuel. However, ammonia combustion is a challenging task due to its narrow flammability limit, low flame speed, and slow kinetics compared with conventional hydrocarbon fuels. The blending of ammonia with higher reactive fuel such as hydrogen seems a novel alternative to overcome these difficulties. So, a comprehensive study of NH3/H2/air combustion characteristics is necessary. In the literature, numerous ammonia reaction models can be found, but most of them failed to demonstrate good combustion characteristics with NH3/H2/air mixtures. A new NH3/H2/air reaction model is suggested or proposed in the present work by referring to the previously available literature. The newly proposed reaction model consists of 32 species and 259 reactions. Model validation for laminar flame speed and ignition delay time at different operating conditions are performed in this study using the newly proposed reaction mechanism. Also, an extensive chemical kinetic modeling for heat release rate, flame speed and OH sensitivity analysis, reaction pathway analysis, and NOx emission characteristics of NH3/H2/air mixture is studied. The results show that the proposed reaction model closely follows the experimental trends, and lesser inconsistency is observed than the other reaction models compared in this study. All referenced reaction models used in the present work for comparison shows large discrepancies with experimental results of NH3/H2/air combustion, especially more discrepancies are observed at higher hydrogen enrichment conditions. Hydrogen enrichment positively affects the heat release rate intensity and flame speed of NH3/air mixture. Through the addition of hydrogen, the burning velocity of ammonia can be increased up to the level of hydrocarbon fuels, and the combination of ammonia and hydrogen blend can be used as an effective industrial fuel.

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Experimental investigation on laminar burning velocities of ammonia/hydrogen/air mixtures at elevated temperatures

Cited by 297 publications

References 40 publications

An experimental and modeling study of ammonia with enriched oxygen content and ammonia/hydrogen laminar flame speed at elevated pressure and temperature

An experimental and modeling study of ammonia with enriched oxygen content and ammonia/hydrogen laminar flame speed at elevated pressure and temperature

Effect of Intermediate Radicals on NO_x and De‐NO_x Characteristics of NH₃/H₂/Air Flames at High Pressure

Chemical kinetic analysis on influence of hydrogen enrichment on the combustion characteristics of ammonia air using newly proposed reaction model

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Experimental investigation on laminar burning velocities of ammonia/hydrogen/air mixtures at elevated temperatures

Cited by 297 publications

References 40 publications

An experimental and modeling study of ammonia with enriched oxygen content and ammonia/hydrogen laminar flame speed at elevated pressure and temperature

An experimental and modeling study of ammonia with enriched oxygen content and ammonia/hydrogen laminar flame speed at elevated pressure and temperature

Effect of Intermediate Radicals on NOx and De‐NOx Characteristics of NH3/H2/Air Flames at High Pressure

Chemical kinetic analysis on influence of hydrogen enrichment on the combustion characteristics of ammonia air using newly proposed reaction model

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Effect of Intermediate Radicals on NO_x and De‐NO_x Characteristics of NH₃/H₂/Air Flames at High Pressure