Influence of NOx chemistry on the prediction of natural gas end-gas autoignition in CFD engine simulations

Bestel, Diego; Olsen, Daniel B.; Marchese, Anthony J.; Windom, Bret

doi:10.1016/j.proci.2022.07.225

Cited by 2 publications

(1 citation statement)

References 18 publications

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“…As computational fluid dynamics (CFD) continues to evolve, an increasing number of scientists have worked digital models to investigate the mechanisms and processes involved in the reduction and generation of NOx. − M. J. Kwon et al numerically investigate the details of NOx reduction in a mid/large-sized combustion system employing a new novel FIR burner, which thoroughly studies with emphasis on the effects of buoyancy and thermal radiation predicts the effects of buoyancy and thermal radiation. At present, there is a growing body of research focused on the creation of open-source computational models for combustion, which are leading to increasingly accurate predictions of flame behavior that more closely align with experimental observations.…”

Section: Challenges Research Gaps and Perspectivesmentioning

confidence: 99%

Review and Perspectives of Novel Flue-Gas Internal Recirculation Combustion Technology for Low Nitrogen Emission: Fundamentals, Performance, Method, and Applications for Conventional Fossil Fuels and Sustainable e-Fuels

Zhu

Wang

2023

Energy Fuels

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Novel flue-gas internal recirculation (FIR) is gaining increasing attention owing to its overwhelming stable combustion and nitrogen oxide (NOx) reduction advantages. This paper aims to reveal the nitrogen reduction mechanisms in the exciting new FIR methods and discuss the main FIR techniques in terms of combustion performance. In particular, the basic concept and the nitrogen reduction mechanism of FIR are first introduced. Besides, three main categories of FIRs are reviewed in accordance with the characteristics and operation status of different devices. The analysis of 16 FIR systems suggests that the recirculation space, effective recirculation rate, and combustion ignition limit must be considered during the design process, in order to balance NOx reduction and combustion efficiency. The integrated FIR and external FIR can achieve NOx emission reductions of at least 20% and 15.5%−20%, respectively. The embedded FIR exhibits more outstanding NOx emission reduction performance, with NOx reduction ratios of up to 26.09%−65%. In addition, the influence elements of FIR on combustion efficiency and nitrogen reduction are also discussed. In conclusion, strategies aimed at enhancing the combustion performance of novel FIR burners are thoroughly delineated, and the challenges that need to be addressed are succinctly highlighted in a forward-looking perspective. This review is expected to clarify the NOx reduction and combustion characteristics of current FIR techniques and suggest a development direction for FIR design.

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Section: Challenges Research Gaps and Perspectivesmentioning

confidence: 99%

Review and Perspectives of Novel Flue-Gas Internal Recirculation Combustion Technology for Low Nitrogen Emission: Fundamentals, Performance, Method, and Applications for Conventional Fossil Fuels and Sustainable e-Fuels

Zhu

Wang

2023

Energy Fuels

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Effects of charge motion on knock and thermal efficiency under high load condition of a heavy-duty natural gas engine

Wei,

Yue,

Ning

et al. 2024

Proceedings of the Institution of Mechanical Engineers, Part D:

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Nowadays, the carbon-neutral trend and the crude oil crisis have brought natural gas into increasing focus. However, heavy-duty engines fueled by natural gas have been plagued by thermal efficiency and knocking limitation problems. Well-structured charge motions can enhance thermal efficiency and concurrently mitigate knock, however, there is a lack of comprehensive work involving charge motions. In this paper, numerical simulation is employed to investigate the impact of charge motion on knock and thermal efficiency under high load conditions for a heavy-duty spark-ignition natural gas engine. The findings indicate that in the configuration with intense swirl, the diminished turbulent kinetic energy (TKE) at the combustion chamber’s base lessens the convective heat exchange between the fresh charge and the heated exhaust gases, resulting in a noticeable high-temperature zone and triggering hot spots. In configurations with inclined swirl and strong tumble motion, the extensive tumble motion near the spark plug region close to top dead center leads to an asymmetric flame front shape, determining the location of hotspots. The research also revealed that excessive tumbling motion and TKE can increase the likelihood of engine knock, while appropriate cylinder charge motion can improve the knock resistance of the engine to some extent, the maximum reduction in knocking intensity can reach 92.5%. The optimized combustion systems can significantly improve the initial combustion rate, shorten the ignition delay period, and advance the combustion center. With the combined effects of ignition timing and charge motion, the total indicated specific power per unit of fuel mass is increased in the optimized systems. Compared to the original combustion system, the indicated thermal efficiency within the knocking boundary can be improved by 1.11%.

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Influence of NOx chemistry on the prediction of natural gas end-gas autoignition in CFD engine simulations

Cited by 2 publications

References 18 publications

Review and Perspectives of Novel Flue-Gas Internal Recirculation Combustion Technology for Low Nitrogen Emission: Fundamentals, Performance, Method, and Applications for Conventional Fossil Fuels and Sustainable e-Fuels

Review and Perspectives of Novel Flue-Gas Internal Recirculation Combustion Technology for Low Nitrogen Emission: Fundamentals, Performance, Method, and Applications for Conventional Fossil Fuels and Sustainable e-Fuels

Effects of charge motion on knock and thermal efficiency under high load condition of a heavy-duty natural gas engine

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