Bluff-body effect on thermal and NO  emission characteristics in a micro-planar combustor fueled with premixed ammonia-oxygen

Cai, Tao; Zhao, Dan; Jiaqiang, E

doi:10.1016/j.cep.2020.107979

Cited by 40 publications

(8 citation statements)

References 45 publications

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“…In the application of microcombustors, Cai et al 189 studied the effect of bluff body on NO x emissions in a microplanar combustor fueled with premixed ammonia−oxygen. It was reported that, with an optimized design of the bluff body, the NO x emission can be significantly reduced.…”

Section: Controlling No X Emission In Ammonia-fueled Combustion Devicesmentioning

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

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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.

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Section: Controlling No X Emission In Ammonia-fueled Combustion Devicesmentioning

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

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“…The second-order upwind scheme is selected to discretize each governing equation. The residual error of energy equation is 1×10 -6 , while the residual errors of the other equations are 1×10 -3 (Cai et al 2020). The inlet temperature is 575 K, and the inlet velocity is 10.28 m•s -1 , 6.12 m•s -1 and 4.93 m•s -1 , respectively.…”

Section: Simulated Boundary Conditionsmentioning

confidence: 99%

NO catalytic performance analysis of gasoline engine tapered variable cell density carrier catalytic converter

Zuo

Yang

Zhang

et al. 2021

Environ Sci Pollut Res

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Improving the flow field uniformity of catalytic converter can promote the catalytic conversion of NO to NO2. Firstly, the physical and mathematical models of improved catalytic converter are established, and its accuracy is verified by experiments. Then, the NO catalytic performance of standard and improved catalytic converters is compared, and the influences of structural parameters on its performance are investigated. The results showed that: (1) The gas uniformity, pressure drop and NO conversion rate of the improved catalytic converter are increased by 0.0643, 6.78% and 7.0% respectively. (2) As the cell density combination is 700 cpsi/600 cpsi, NO conversion rate reaches the highest, 73.7%, and the gas uniformity is 0.9821. (3) When the tapered height is 20 mm, NO conversion rate reaches the highest, 72.4%, the gas uniformity is 0.9744. (4) When the high cell density radius is 20 mm, NO conversion rate reaches the highest, 72.1%, the gas uniformity is 0.9783. (5) When the tapered end face radius is 20 mm, NO conversion rate reaches the highest, 72.0%, the gas uniformity is 0.9784. The results will provide a very important reference value for improving NO catalytic and reducing vehicle emission.

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“…[3] In addition, methane (the main component of NG) has a high octane number and is available for high compression ratio engines to improve thermal performance, but at the same time, this leads to increased NOx emissions. [4,5] NOx is harmful to human health and may further lead to the formation of secondary pollutants such as ozone and secondary particulate matter. [6] To solve this problem, exhaust gas recirculation (EGR) technology has been widely used to reduce NOx emissions by introducing a portion of the combustion exhaust gas into the cylinder and lowering the combustion temperature.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of the effect of CO₂/H₂O dilution on the laminar burning velocity of methane/air flames under elevated initial temperature and pressure

Yang

Wang

et al. 2022

Can J Chem Eng

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Diluents have an essential effect during combustion. Discovering the influence of CO2 and H2O as diluents on laminar burning velocity (LBV) is helpful for combustion control and optimization. In this study, CH4/air/CO2/H2O mixtures were investigated and validated using the FFCM‐Mech 1.0 over extensive boundary conditions. The chemical effects of the diluents CO2 and H2O were separated using a decoupling method. It was found that an increase in initial temperature promotes the chemical effects, while an increase in initial pressure does the opposite. In addition, the inhibiting effect of CO2 on LBV is stronger than that of H2O. Sensitivity, mole fraction, and rate of production (ROP) analyses were used to reveal that the sum of the chemical effects of adding CO2 and H2O separately was greater than the chemical effects of adding equal amounts of CO2 and H2O simultaneously. This paper not only investigates the effect of CO2 and H2O on the LBV under wide boundary conditions, but also offers a valuable guide for studying the operating conditions and intensity settings of exhaust gas recirculation (EGR) and theoretical guidance for further research on the combination of EGR and in‐cylinder water injection technology.

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Bluff-body effect on thermal and NO emission characteristics in a micro-planar combustor fueled with premixed ammonia-oxygen

Cited by 40 publications

References 45 publications

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

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

NO catalytic performance analysis of gasoline engine tapered variable cell density carrier catalytic converter

Numerical study of the effect of CO₂/H₂O dilution on the laminar burning velocity of methane/air flames under elevated initial temperature and pressure

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Bluff-body effect on thermal and NO emission characteristics in a micro-planar combustor fueled with premixed ammonia-oxygen

Cited by 40 publications

References 45 publications

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

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

NO catalytic performance analysis of gasoline engine tapered variable cell density carrier catalytic converter

Numerical study of the effect of CO2/H2O dilution on the laminar burning velocity of methane/air flames under elevated initial temperature and pressure

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Product

Resources

About

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

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

Numerical study of the effect of CO₂/H₂O dilution on the laminar burning velocity of methane/air flames under elevated initial temperature and pressure