Effects of OH concentration and temperature on NO emission characteristics of turbulent non-premixed CH4/NH3/air flames in a two-stage gas turbine like combustor at high pressure

Somarathne, Kapuruge Don Kunkuma Amila; Okafor, Ekenechukwu C.; Sugawara, Daiki; Hayakawa, Akihiro; Kobayashi, Haruo

doi:10.1016/j.proci.2020.06.276

Cited by 76 publications

(14 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The high NO concentration zone is related to the high heat release rate zone because the NO formation in ammonia/methane combustion was highly sensitive to temperature, which is consistent with the result in Figure 12 (NO was mainly distributed at c > 0.7). This phenomenon was also observed in the previous research performed by K. D. K. A. Somarathne et al [31].…”

Section: Co and No Emissionssupporting

confidence: 88%

“…When c < 0.75, OH was produced as an intermediate radical mainly through the following reaction: H + O 2 = OH + O. This reaction is highly sensitive to temperature [31], thereby increasing the OH concentration quickly with the progress variable. When 0.75 < c < 0.8, OH was consumed quickly with H 2 and CO.…”

Section: Figure 8 Computed Instantaneous 2d Distributions Of H 2 and Ohmentioning

confidence: 99%

See 1 more Smart Citation

Effects of ammonia addition on combustion characteristics in partially-premixed swirling ammonia/methane/air flame

et al. 2022

View full text Add to dashboard Cite

Ammonia (NH3) combustion has received intense research interest recently for its potential to reduce CO2 emission. This study aims to investigate the turbulent combustion characteristics in a bluff-body burner for CH4/NH3 mixtures with different ammonia blending ratios (15%, 30%, and 45% by mole fraction) through large eddy simulation and experiments. The simulations are conducted using OpenFOAM with a low Mach number solver and the partially stirred reactor combustion model with a detailed reaction mechanism. The flow field of one typical case is measured using the particle image velocimetry technique to verify the accuracy of the numerical results. The combustion characteristics are discussed. As the ammonia blending ratio increases, the flame height shortens, the flame color gradually changes from blue to orange, and the intermittent local quenching zone moves upstream, indicating that the combustion is becoming unstable. Meanwhile, the flow fields exhibit similar characteristics though the ammonia concentration varies greatly. The CO and NO emissions are also discussed. The CO emission decreases and the NO emission increases as the ammonia blending ratio increases.

show abstract

Section: Co and No Emissionssupporting

confidence: 88%

Section: Figure 8 Computed Instantaneous 2d Distributions Of H 2 and Ohmentioning

confidence: 99%

Effects of ammonia addition on combustion characteristics in partially-premixed swirling ammonia/methane/air flame

et al. 2022

View full text Add to dashboard Cite

show abstract

“…Owing to the promising features in mitigating NO x emission of ammonia combustion, numerous experimental and numerical studies have been performed on the staged combustion. ,,,,,− Different combustion geometries and patterns have been tested under varied pressures and temperatures, with the focus on tuning the overall equivalence ratio or the equivalence ratios in the primary or secondary flame zones through adjusting the primary and secondary air injections.…”

Section: Development Of No X Abatement Technologiesmentioning

confidence: 99%

NO_x Emission and Control in Ammonia Combustion: State-of-the-Art Review and Future Perspectives

Zhu,

Du,

et al. 2023

Energy Fuels

View full text Add to dashboard Cite

Global warming as a result of greenhouse gas emissions generated by anthropogenic activities (mainly the combustion of fossil fuels) has become an increasingly more severe challenge for all mankind. As a promising zero-carbon energy carrier toward the transition to a carbon-neutral society, ammonia has drawn broad attention from academia, industry, and government bodies. However, widespread applications of ammonia as a primary fuel in combustion devices require solutions for multiple technical challenges, among which the possibly very high nitrogen oxide (NO x ) emission in the flue gas is the most concerned one. In this regard, extensive research efforts have been devoted over recent years to a deep understanding of the NO x formation mechanisms, which, in turn, result in a number of NO x -inhibiting technologies successfully developed; these include staged combustion, ultra-lean combustion, moderate or intense low oxygen dilution combustion, plasma-assisted combustion, etc. In this review, a brief literature review has been performed on NO x emission from ammonia flames, with the emphasis put on discussions of advances in understanding chemical kinetics related to NO x formation and reduction, effective technologies for NO x abatement, and applications of these technologies in practical ammonia-fired combustion devices. This review can serve as a reference for future studies on NO x emission and control in ammonia flames and the promotion of ammonia as a zero-carbon fuel in practical applications.

show abstract

“…In the past few years, for the above reasons among others, mixtures of NH 3 with other fuels such as CH 4 have exhibited a strong interest to be accounted for in the transition from energy systems based on fossil fuels to others based on carbon-free fuels. A large number of experimental and modeling studies of the combustion of NH 3 /CH 4 mixtures at low pressure (from 0.4 to 5 bar) have been reported in the literature, using different experimental set-ups such as flow reactors, ,− different burners such as the Mckenna burner, a plate burner, a swirl burner, ,, an axisymmetric burner, a heat flux burner, different premixed laminar burners, − and a porous media burner, as well as combustors such as cylindrical combustor chambers, ,, turbines such as a micro gas turbine combustor, a swirl flame combustor, ,− and gas turbine systems, − as well as numerical studies. − …”

Section: Introductionmentioning

confidence: 99%

“…Among the previous studies, we can find flame studies, ,, emissions characteristics, flame propagations, flame structure, autoignition properties, ,, laminar burning velocity and flame speed, ,,, and numerical studies. ,,,,,,,− ,− ,,− ,− …”

Section: Introductionmentioning

confidence: 99%

Experimental and Modeling High-Pressure Study of Ammonia–Methane Oxidation in a Flow Reactor

García-Ruiz,

Salas,

Casanova

et al. 2024

Energy Fuels

View full text Add to dashboard Cite

The present work deals with an experimental and modeling analysis of the oxidation of ammonia−methane mixtures at high pressure (up to 40 bar) in the 550−1250 K temperature range using a quartz tubular reactor and argon as a diluent. The impact of temperature, pressure, oxygen stoichiometry, and CH 4 / NH 3 ratio has been analyzed on the concentrations of NH 3 , NO 2 , N 2 O, NO, N 2 , HCN, CH 4 , CO, and CO 2 obtained as main products of the ammonia−methane mixture oxidation. The main results obtained indicate that increasing either the pressure, CH 4 /NH 3 ratio, or stoichiometry results in a shift of NH 3 and CH 4 conversion to lower temperatures. The effect of pressure is particularly significant in the low range of pressures studied. The main products of ammonia oxidation are N 2 , NO, and N 2 O while NO 2 concentrations are below the detection limit for all of the conditions considered. The N 2 O formation is favored by increasing the CH 4 / NH 3 ratio and stoichiometry. The experimental results are simulated and interpreted in terms of an updated detailed chemical kinetic mechanism, which, in general, is able to describe well the conversion of both NH 3 and CH 4 under almost all of the studied conditions. Nevertheless, some discrepancies are found between the experimental results and model calculations.

show abstract

Effects of OH concentration and temperature on NO emission characteristics of turbulent non-premixed CH4/NH3/air flames in a two-stage gas turbine like combustor at high pressure

Cited by 76 publications

References 20 publications

Effects of ammonia addition on combustion characteristics in partially-premixed swirling ammonia/methane/air flame

Effects of ammonia addition on combustion characteristics in partially-premixed swirling ammonia/methane/air flame

NO_x Emission and Control in Ammonia Combustion: State-of-the-Art Review and Future Perspectives

Experimental and Modeling High-Pressure Study of Ammonia–Methane Oxidation in a Flow Reactor

Contact Info

Product

Resources

About

Effects of OH concentration and temperature on NO emission characteristics of turbulent non-premixed CH4/NH3/air flames in a two-stage gas turbine like combustor at high pressure

Cited by 76 publications

References 20 publications

Effects of ammonia addition on combustion characteristics in partially-premixed swirling ammonia/methane/air flame

Effects of ammonia addition on combustion characteristics in partially-premixed swirling ammonia/methane/air flame

NOx Emission and Control in Ammonia Combustion: State-of-the-Art Review and Future Perspectives

Experimental and Modeling High-Pressure Study of Ammonia–Methane Oxidation in a Flow Reactor

Contact Info

Product

Resources

About

NO_x Emission and Control in Ammonia Combustion: State-of-the-Art Review and Future Perspectives