Experimental study and kinetic modeling of NH3/CH4 co-oxidation in a jet-stirred reactor

Article Thermodynamics

On the Oxidation of Ammonia and Mutual Sensitization of the Oxidation of No and Ammonia: Experimental and Kinetic Modeling

Philippe Dagaut

Summary: This study found that nitric oxide can activate ammonia oxidation, and OH production is mainly responsible for ammonia oxidation under the current conditions.

COMBUSTION SCIENCE AND TECHNOLOGY (2022)

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Article Thermodynamics

Experimental and kinetic modeling study of the homogeneous chemistry of NH3 and NOx with CH4 at the diluted conditions

Zijian Sun et al.

Summary: The oxidation of NH3/NOx mixtures is affected by the NO/NO2 ratio, while the addition of CH4 significantly promotes the reactivity of the mixture and enhances the production of H2O. Additionally, CH4 also promotes the formation of carbonyl and nitrogenous species in the reaction process.

COMBUSTION AND FLAME (2022)

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Article Energy & Fuels

Ammonia and ammonia/hydrogen blends oxidation in a jet-stirred reactor: Experimental and numerical study

Ksenia N. Osipova et al.

Summary: The study focuses on experimental data of ammonia and ammonia/hydrogen blends oxidation, revealing that the addition of hydrogen lowers the onset temperature of ammonia oxidation by 250 K. A chemical kinetic model indicates that hydrogen presence increases concentrations of H, O, and OH radicals, forming at lower temperatures, while changes in equivalence ratio have minimal effect on the temperature range of ammonia conversion.

FUEL (2022)

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Article Energy & Fuels

Experimental study and mechanism analysis of the NOx emissions in the NH3 MILD combustion by a novel burner

Haiyang Shi et al.

Summary: NH3 MILD combustion can significantly reduce NOx emissions, and the impact of NH3 flow rate and equivalence ratio on NO emissions in NH3 MILD combustion were analyzed in detail.

FUEL (2022)

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Article Chemistry, Physical

Experimental and numerical study on premixed partially dissociated ammonia mixtures. Part I: Laminar burning velocity of NH3/H2/N2/air mixtures

Changwei Ji et al.

Summary: This study measured the laminar burning velocity at various equivalence ratios and dissociation degrees of ammonia using the constant pressure spherical flame method, and compared fifteen kinetic models with the experimental data to find the model with the best consistency.

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY (2022)

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Article Thermodynamics

An experimental and modeling study of ammonia oxidation in a jet stirred reactor

Ruoyue Tang et al.

Summary: This study investigates the oxidation of ammonia and proposes a chemical kinetic model for ammonia oxidation. The results show that ammonia oxidation is highly reactive under ultralean conditions, with lower temperatures and higher rates of oxidation. However, this reactivity diminishes rapidly with an increase in equivalence ratio, resulting in similar ammonia oxidation characteristics at equivalence ratios of 0.5 and 1.0. The study also analyzes the reaction pathways for different equivalence ratios and oxidation temperatures.

COMBUSTION AND FLAME (2022)

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Article Chemistry, Physical

Oxidizer effects on ammonia combustion using a generated non-premixed burner

Mustafa Ilbas et al.

Summary: In this study, the combustion of pure ammonia in a model combustor was investigated to explore ammonia-fueled applications. The effects of oxygen enrichment on flame characteristics, temperature profiles, and NO profiles during ammonia combustion were evaluated, and compared with the combustion of air-ammonia mixture. The results showed that the use of an oxidizer with 100% oxygen content provided better flame stability in pure ammonia combustion. The most stable flame for oxy-ammonia combustion was achieved with an excess oxygen coefficient of 1.0 or 1.2, and the lowest NO levels were observed under fuel-rich conditions. The air-ammonia combustion resulted in a significant decrease in temperature and NO emissions, but flame stabilities were unsatisfactory except under fuel-rich conditions. The oxy-enrichment condition is considered a promising method for pure ammonia combustion, provided that NO emissions can be optimized with NO reduction methods.

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY (2022)

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Article Thermodynamics

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

Krishna Prasad Shrestha et al.

Summary: This study experimentally investigated the laminar flame speeds of ammonia and ammonia-hydrogen blends under different temperature, pressure, and oxygen content conditions, and developed a new kinetic model for predicting the oxidation mechanisms, considering the formation and reduction of nitrogen oxides. The results showed that the laminar flame speed increases with increasing initial temperature, fuel hydrogen content, or oxidizer oxygen content, but decreases with increasing initial pressure. The proposed kinetic model predicts the same trends as experiments and highlights the importance of N2H2 formation under rich conditions.

PROCEEDINGS OF THE COMBUSTION INSTITUTE (2021)

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Article Thermodynamics

Ammonia-methane interaction in jet-stirred and flow reactors: An experimental and kinetic modeling study

Suphaporn Arunthanayothin et al.

Summary: Experimental and numerical studies investigated the influence of ammonia addition on methane oxidation, showing that NH3 promoted CH4 reactivity at temperatures below 1200K but had less impact at higher temperatures. A kinetic model helped explain the underlying causes of methane reactivity at low temperatures and the significant role of NOx. The reactivity at higher temperatures was mainly governed by H-abstractions on both fuels.

PROCEEDINGS OF THE COMBUSTION INSTITUTE (2021)

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Article Thermodynamics

Combustion chemistry of ammonia/hydrogen mixtures: Jet-stirred reactor measurements and comprehensive kinetic modeling

Xiaoyuan Zhang et al.

Summary: This study investigates the oxidation of ammonia/hydrogen mixtures at intermediate temperatures using experimental and modeling approaches. The results show that hydrogen blending enhances the oxidation reactivity of ammonia, leading to increased OH radical production and accelerated ammonia consumption. Non-monotonous trends in NOx formation are observed at 99% conversion of ammonia, influenced by the competition between dilution and chemical effects of hydrogen addition.

COMBUSTION AND FLAME (2021)

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Article Thermodynamics

Ignition delay times of NH3/DME blends at high pressure and low DME fraction: RCM experiments and simulations

Liming Dai et al.

Summary: The autoignition delay times of ammonia/dimethyl ether (NH3/DME) mixtures are significantly affected by the percentage of DME and pressure. The oxidation of DME occurs more rapidly than that of ammonia during the ignition process, leading to the initiation of ammonia oxidation and heat release that accelerates the overall oxidation process towards ignition.

COMBUSTION AND FLAME (2021)

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Article Chemistry, Physical

Stability limits and NO emissions of premixed swirl ammonia-air flames enriched with hydrogen or methane at elevated pressures

Abdulrahman A. Khateeb et al.

Summary: Increasing pressure widens the range of stable equivalence ratios for pure ammonia-air flames. There is a critical ammonia fraction above which the range of stable equivalence ratios suddenly widens, regardless of pressure. The critical ammonia fraction increases with pressure and is larger for ammonia-hydrogen than for ammonia-methane.

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY (2021)

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Article Thermodynamics

Experimental and kinetic study on the laminar burning velocities of NH3 mixing with CH3OH and C2H5OH in premixed flames

Zhihua Wang et al.

Summary: The laminar burning velocities of ammonia blended with methanol/air and ethanol/air flames were studied, a new kinetic mechanism was proposed and validated, and it was found that interactions between C- and N-containing species are insignificant for the laminar burning velocities of various ammonia blending mixtures.

COMBUSTION AND FLAME (2021)

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Article Energy & Fuels

Toward a More Comprehensive Understanding of the Kinetics of a Common Biomass-Derived Impurity: NH3 Oxidation by N2O in a Jet-Stirred Reactor

Rodger E. Cornell et al.

Summary: Ammonia has gained significant attention due to its importance in energy utilization and environmental impacts. Gaps in the understanding of ammonia kinetics, specifically in experimental data and submodels, have been identified. Experimental results suggest deficiencies in commonly used models for nitrogen kinetics.

ENERGY & FUELS (2021)

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Article Chemistry, Physical

Effects of O2 enrichment on NH3/air flame propagation and emissions

Hee Kyung Kim et al.

Summary: The use of ammonia as a carbon-free fuel under oxygen-enriched conditions is demonstrated in the study. It is shown that oxygen-enriched ammonia/air flames become thinner and propagate faster, with all oxygen-enriched flames being stable in terms of flamefront cellular instability. The presence of 35-40% oxygen in nonfuel mixtures is found to provide proper burning intensity for practical applications, although nitrogen oxides emissions are high and need to be substantially reduced in practical systems.

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY (2021)

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Article Chemistry, Physical

Laminar burning characteristics of ammonia/ hydrogen/air mixtures with laser ignition

Ning Wang et al.

Summary: This study investigates the laminar burning characteristics of premixed ammonia/hydrogen/air mixtures, aiming to explore effective ways to burn ammonia in engines. The experimental and simulation results show that the laminar burning velocity of ammonia mixtures increases at first, reaches a peak around an equivalence ratio of 1.1, and then decreases as the equivalence ratio increases from 0.7 to 1.4. The peak laminar burning velocities of the ammonia mixture are lower than 9 cm/s and are significantly lower than those of hydrocarbon fuels.

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY (2021)

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Article Energy & Fuels

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

Charles Lhuillier et al.

FUEL (2020)

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Article Thermodynamics

Experimental and modeling study of nitric oxide formation in premixed methanol plus air flames

Christian Brackmann et al.

COMBUSTION AND FLAME (2020)

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Article Energy & Fuels

Oxidation and pyrolysis of ammonia mixtures in model reactors

Maria Virginia Manna et al.

FUEL (2020)

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Article Thermodynamics

Experimental and numerical analysis of the autoignition behavior of NH3 and NH3/H2 mixtures at high pressure

Liming Dai et al.

COMBUSTION AND FLAME (2020)

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Article Thermodynamics

Autoignition studies of NH3/CH4 mixtures at high pressure

Liming Dai et al.

COMBUSTION AND FLAME (2020)

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Article Thermodynamics

Propagation and emissions of premixed methane-ammonia/air flames

J. W. Ku et al.

ENERGY (2020)

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Article Thermodynamics

Stability limits and exhaust NO performances of ammonia-methane-air swirl flames

Abdulrahman A. Khateeb et al.

EXPERIMENTAL THERMAL AND FLUID SCIENCE (2020)

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Article Energy & Fuels

Experiments and kinetic modeling of NO reburning by CH4 under high CO2 concentration in a jet-stirred reactor

Pengfei Li et al.

FUEL (2020)

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Article Energy & Fuels

Ammonia oxidation features in a Jet Stirred Flow Reactor. The role of NH2 chemistry.

Pino Sabia et al.

FUEL (2020)

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Article Thermodynamics

Experimental study and kinetic analysis of the laminar burning velocity of NH3/syngas/air, NH3/CO/air and NH3/H2/air premixed flames at elevated pressures

Shixing Wang et al.

COMBUSTION AND FLAME (2020)

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Article Chemistry, Multidisciplinary

An experimental, theoretical and kinetic-modeling study of the gas-phase oxidation of ammonia

Alessandro Stagni et al.

REACTION CHEMISTRY & ENGINEERING (2020)

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Article Thermodynamics

Experimental and numerical study, under LTC conditions, of ammonia ignition delay with and without hydrogen addition

Maxime Pochet et al.

PROCEEDINGS OF THE COMBUSTION INSTITUTE (2019)

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Article Thermodynamics

A shock tube and modeling study on the autoignition properties of ammonia at intermediate temperatures

B. Shu et al.

PROCEEDINGS OF THE COMBUSTION INSTITUTE (2019)

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Article Chemistry, Physical

Burning velocity and flame structure of CH4/NH3/air turbulent premixed flames at high pressure

Akinori Ichikawa et al.

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY (2019)

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Review Chemistry, Physical

Hydrogen storage and delivery: Review of the state of the art technologies and risk and reliability analysis

Ramin Moradi et al.

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY (2019)

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Article Thermodynamics

Measurement and modelling of the laminar burning velocity of methane-ammonia-air flames at high pressures using a reduced reaction mechanism

Ekenechukwu Chijioke Okafor et al.

COMBUSTION AND FLAME (2019)

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Article Thermodynamics

Auto-ignition kinetics of ammonia and ammonia/hydrogen mixtures at intermediate temperatures and high pressures

X. He et al.

COMBUSTION AND FLAME (2019)

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Article Thermodynamics

Experimental and kinetic modeling study of laminar burning velocities of NH3/air, NH3/H2/air, NH3/CO/air and NH3/CH4/air premixed flames

Xinlu Han et al.

COMBUSTION AND FLAME (2019)

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Article Energy & Fuels

Combustion of NH3/CH4/Air and NH3/H2/Air Mixtures in a Porous Burner: Experiments and Kinetic Modeling

Rodolfo C. Rocha et al.

ENERGY & FUELS (2019)

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Review Thermodynamics

Science and technology of ammonia combustion

Hideaki Kobayashi et al.

PROCEEDINGS OF THE COMBUSTION INSTITUTE (2019)

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Article Thermodynamics

Experimental and numerical study of the laminar burning velocity of CH4-NH3-air premixed flames

Ekenechukwu C. Okafor et al.

COMBUSTION AND FLAME (2018)

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Article Thermodynamics

Formation of NO and NH in NH3-doped CH4 + N-2 + O-2 flame: Experiments and modelling

Christian Brackmann et al.

COMBUSTION AND FLAME (2018)

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Article Chemistry, Physical

Chemical kinetic modeling of ammonia oxidation with improved reaction mechanism for ammonia/air and ammonia/hydrogen/air combustion

Junichiro Otomo et al.

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY (2018)

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Review Thermodynamics

Modeling nitrogen chemistry in combustion

Peter Glarborg et al.

PROGRESS IN ENERGY AND COMBUSTION SCIENCE (2018)

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Article Energy & Fuels

Modeling Combustion of Ammonia/Hydrogen Fuel Blends under Gas Turbine Conditions

Hua Xiao et al.

ENERGY & FUELS (2017)

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Article Energy & Fuels

Numerical study assessing various ammonia/methane reaction models for use under gas turbine conditions

Hua Xiao et al.

FUEL (2017)

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Article Chemistry, Physical

Porous medium based burner for efficient and clean combustion of ammonia-hydrogen-air systems

Hadi Nozari et al.

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY (2017)

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Article Thermodynamics

Kinetic modeling of ammonia/air weak flames in a micro flow reactor with a controlled temperature profile

Hisashi Nakamura et al.

COMBUSTION AND FLAME (2017)

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Article Energy & Fuels

Ammonia oxidation at high pressure and intermediate temperatures

Yu Song et al.

FUEL (2016)

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Article Thermodynamics

Experimental and modeling study on the high-temperature oxidation of Ammonia and related NOx chemistry

Olivier Mathieu et al.

COMBUSTION AND FLAME (2015)

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Article Energy & Fuels

Laminar burning velocity and Markstein length of ammonia/air premixed flames at various pressures

Akihiro Hayakawa et al.

FUEL (2015)

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Article Chemistry, Physical

Laminar burning velocity and Markstein length of ammonia/hydrogen/air premixed flames at elevated pressures

Akinori Ichikawa et al.

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY (2015)

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Article Energy & Fuels

Study on using hydrogen and ammonia as fuels: Combustion characteristics and NOx formation

Jun Li et al.

INTERNATIONAL JOURNAL OF ENERGY RESEARCH (2014)

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Article Engineering, Environmental

On the temperature dependence of flammability limits of gases

Shigeo Kondo et al.

JOURNAL OF HAZARDOUS MATERIALS (2011)

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Article Thermodynamics

Ammonia chemistry in oxy-fuel combustion of methane

Teresa Mendiara et al.

COMBUSTION AND FLAME (2009)

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Article Thermodynamics

An experimental and kinetic modeling study of premixed NH3/CH4/O2/Ar flames at low pressure

Zhenyu Tian et al.

COMBUSTION AND FLAME (2009)

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Article Thermodynamics

Flammability limits of NH3-H-2-N-2-air mixtures at elevated initial temperatures

G Ciccarelli et al.

COMBUSTION AND FLAME (2006)

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Experimental study and kinetic modeling of NH3/CH4 co-oxidation in a jet-stirred reactor

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