Experimental investigations on laminar burning velocity variation of CH4+H2+air mixtures at elevated temperatures

Berwal, Pragya; Solagar, Saran; Kumar, Sudarshan

doi:10.1016/j.ijhydene.2022.03.155

Cited by 24 publications

(6 citation statements)

References 41 publications

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Section: Resultsmentioning

confidence: 79%

“…This can be explained by the lower density and higher diffusivity of hydrogen that allow a higher diffusion of diesel vapor as well. However, this feature can lead to slightly retarded ignition of the mixture but is later compensated by the higher velocity of H 2 oxidation [54,55], explaining the trends observed in Figure 12. To better understand the combustion development of the HRF and LRF fuels, the images in Figure 14 show the dispersion of diesel vapor in the cylinder for the two extreme test cases (100% CH4 and 100% H2): in the case with air/hydrogen mixture, the vapor amount occupies a greater volume with higher penetration.…”

Section: Resultsmentioning

confidence: 80%

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Numerical Analysis of Dual Fuel Combustion in a Medium Speed Marine Engine Supplied with Methane/Hydrogen Blends

Cameretti,

De Robbio,

Palomba

2023

Energies

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Compression ignition engines will still be predominant in the naval sector: their high efficiency, high torque, and heavy weight perfectly suit the demands and architecture of ships. Nevertheless, recent emission legislations impose limitations to the pollutant emissions levels in this sector as well. In addition to post-treatment systems, it is necessary to reduce some pollutant species, and, therefore, the study of combustion strategies and new fuels can represent valid paths for limiting environmental harmful emissions such as CO2. The use of methane in dual fuel mode has already been implemented on existent vessels, but the progressive decarbonization will lead to the utilization of carbon-neutral or carbon-free fuels such as, in the last case, hydrogen. Thanks to its high reactivity nature, it can be helpful in the reduction of exhaust CH4. On the contrary, together with the high temperatures achieved by its oxidation, hydrogen could cause uncontrolled ignition of the premixed charge and high emissions of NOx. As a matter of fact, a source of ignition is still necessary to have better control on the whole combustion development. To this end, an optimal and specific injection strategy can help to overcome all the before-mentioned issues. In this study, three-dimensional numerical simulations have been performed with the ANSYS Forte® software (version 19.2) in an 8.8 L dual fuel engine cylinder supplied with methane, hydrogen, or hydrogen–methane blends with reference to experimental tests from the literature. A new kinetic mechanism has been used for the description of diesel fuel surrogate oxidation with a set of reactions specifically addressed for the low temperatures together with the GRIMECH 3.0 for CH4 and H2. This kinetics scheme allowed for the adequate reproduction of the ignition timing for the various mixtures used. Preliminary calculations with a one-dimensional commercial code were performed to retrieve the initial conditions of CFD calculations in the cylinder. The used approach demonstrated to be quite a reliable tool to predict the performance of a marine engine working under dual fuel mode with hydrogen-based blends at medium load. As a result, the system modelling shows that using hydrogen as fuel in the engine can achieve the same performance as diesel/natural gas, but when hydrogen totally replaces methane, CO2 is decreased up to 54% at the expense of the increase of about 76% of NOx emissions.

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Section: Resultsmentioning

confidence: 79%

Section: Resultsmentioning

confidence: 80%

Numerical Analysis of Dual Fuel Combustion in a Medium Speed Marine Engine Supplied with Methane/Hydrogen Blends

Cameretti,

De Robbio,

Palomba

2023

Energies

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“…By comparing the predicted laminar flame velocities from each CRM, the model that best describes the combustion of CH 4 /H 2 can be identified. Figure 4 illustrates the flame velocity (S L ) obtained from experimental measurements [41][42][43][44][45][46][47][48][49][50][51] and numerical predictions at various pressures and preheating temperatures. Observing Figure 4a-c, it is evident that USC Mech 2.0 and San Diego exhibit similar flame velocity predictions across the entire range of equivalence ratios.…”

Section: Chemical Mechanism and Validationmentioning

confidence: 99%

“…Figure 4 illustrates the flame velocity ( S L ) obtained from experimental measurements [ 41–51 ] and numerical predictions at various pressures and preheating temperatures. Observing Figure 4a–c, it is evident that USC Mech 2.0 and San Diego exhibit similar flame velocity predictions across the entire range of equivalence ratios.…”

Section: Chemical Mechanism and Validationmentioning

confidence: 99%

Effects of Hydrogen Addition, Oxygen Level, and Strain Rate on Combustion Characteristics of CH₄/H₂ in Staged MILD Combustion

Zhang,

Liu,

Huang

et al. 2023

Energy Tech

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In this article, the effects of hydrogenation amount (0–80%), oxygen content (14–18%), and strain rate (10–1000 s−1) on the emission characteristics of NO and CO in moderate or intense low‐oxygen dilution (MILD) fractional combustion are studied under the actual working conditions of gas turbine (T = 723 K, P = 16.5 atm). The pathway of NO and CO production and the reaction with the greatest influence on their emissions are analyzed. In the findings, it is indicated that NO emissions are suppressed at lower hydrogen levels, while the addition of hydrogen leads to a decrease in CO emissions. Specifically, the key reaction for NO formation is H + NO + M = HNO + M, whereas CO emissions are primarily controlled by the direct reaction OH + CO = H + CO2. Furthermore, the reduction of oxygen levels effectively suppresses NO and CO emissions during MILD combustion. The variation in oxygen level exerts the greatest influence on the reaction rate of the NNH pathway. High concentrations of O2 are identified as the primary cause of elevated CO levels in MILD combustion. Finally, elevating the strain rate in MILD combustion demonstrates a mitigating effect on NO and CO emissions.

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“…When these two gases are separately incorporated into natural gas, the combustion properties of the mixed gas change monotonically, which limits the practical application space of the mixed gas. Various combustion parameters of natural gas are between ammonia and hydrogen, so considering adding ammonia and hydrogen to natural gas simultaneously can reduce emissions while ensuring its original fuel properties. − In addition, the deflagrate performance of a natural gas/ammonia/hydrogen mixture can also be adjusted to meet different needs.…”

Section: Introductionmentioning

confidence: 99%

Research on the Mechanism and Propagation Characteristics of Combustion and Explosion of Natural Gas/Ammonia/Hydrogen Mixed Gas Fuel

Liu,

Liu

et al. 2024

ACS Omega

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Experimental investigations on laminar burning velocity variation of CH4+H2+air mixtures at elevated temperatures

Cited by 24 publications

References 41 publications

Numerical Analysis of Dual Fuel Combustion in a Medium Speed Marine Engine Supplied with Methane/Hydrogen Blends

Numerical Analysis of Dual Fuel Combustion in a Medium Speed Marine Engine Supplied with Methane/Hydrogen Blends

Effects of Hydrogen Addition, Oxygen Level, and Strain Rate on Combustion Characteristics of CH₄/H₂ in Staged MILD Combustion

Research on the Mechanism and Propagation Characteristics of Combustion and Explosion of Natural Gas/Ammonia/Hydrogen Mixed Gas Fuel

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Experimental investigations on laminar burning velocity variation of CH4+H2+air mixtures at elevated temperatures

Cited by 24 publications

References 41 publications

Numerical Analysis of Dual Fuel Combustion in a Medium Speed Marine Engine Supplied with Methane/Hydrogen Blends

Numerical Analysis of Dual Fuel Combustion in a Medium Speed Marine Engine Supplied with Methane/Hydrogen Blends

Effects of Hydrogen Addition, Oxygen Level, and Strain Rate on Combustion Characteristics of CH4/H2 in Staged MILD Combustion

Research on the Mechanism and Propagation Characteristics of Combustion and Explosion of Natural Gas/Ammonia/Hydrogen Mixed Gas Fuel

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Effects of Hydrogen Addition, Oxygen Level, and Strain Rate on Combustion Characteristics of CH₄/H₂ in Staged MILD Combustion