Effects of ammonia addition on the performance and emissions for a spark-ignition marine natural gas engine

Wei, Wenwen; Li, Gesheng; Zhang, Zunhua; Long, Yanxiang; Zhang, Hanyuyang; Huang, Yong; Zhou, Mengni; Wei, Yang

doi:10.1016/j.energy.2023.127092

Cited by 25 publications

(2 citation statements)

References 43 publications

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“…Compared with the pure NG engine, increasing X NH3 decreased the peak pressure (P max ) and HRR while increasing the best thermal efficiency (BTE) by 1%. NO x emissions, originating from NH 3 at 873 K, initially increased with increasing X NH3 but then decreased [39]. The schematic diagram of the ammonia and natural gas mixed-combustion test process as shown in Figure 5.…”

Section: Combustion and Emission Of Nh3/ch4 Si Enginesmentioning

confidence: 99%

Application of NH3 Fuel in Power Equipment and Its Impact on NOx Emissions

Hu,

Liu,

et al. 2024

Energies

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Due to high greenhouse gas emissions, countries worldwide are stepping up their emission reduction efforts, and the global demand for new, carbon-free fuels is growing. Ammonia (NH3) fuels are popular due to their high production volume, high energy efficiency, ease of storage and transportation, and increased application in power equipment. However, their physical characteristics (e.g., unstable combustion, slow flame speed, and difficult ignition) limit their use in power equipment. Based on the structural properties of the power equipment, NH3 fuel application and emissions characteristics were analyzed in detail. Combustion of NH3 fuels and reduction measures for NOx emissions (spark plug ignition, compression ignition, and gas turbines) were analyzed from various aspects of operating conditions (e.g., mixed fuel, fuel-to-exhaust ratio, and equivalence ratio), structure and strategy (e.g., number of spark plugs, compression ratio (CR), fuel injection, and ignition mode), and auxiliary combustion techniques (e.g., preheating, humidification, exhaust gas recirculation, and secondary air supply). The performance of various NH3 fuel cell (FC) types was analyzed, with a focus on the maximum power achievable for different electrolyte systems. Additionally, the application and NOx emissions of indirect NH3 FCs were evaluated under flame and catalytic combustion conditions. The system efficiency of providing heat sources by burning pure NH3, anode tail gas, and NH3 decomposition gas was also compared. Based on a comprehensive literature review, the key factors influencing the performance and emissions of NH3-powered equipment were identified. The challenges and limitations of NH3-powered equipment were summarized, and potential strategies for improving efficiency and reducing emissions were proposed. These findings provide valuable insights for the future development and application of NH3 FCs.

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Section: Combustion and Emission Of Nh3/ch4 Si Enginesmentioning

confidence: 99%

Application of NH3 Fuel in Power Equipment and Its Impact on NOx Emissions

Hu,

Liu,

et al. 2024

Energies

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“…The use of exhaust gas recirculation or the addition of other, more reactive fuels as combustion aids, that is, the dual fuel combustion mode [26], can improve ammonia combustion, thereby improving fuel efficiency and reducing emissions. Wei et al [27] studied the optimization direction and emission reduction potential of an ammonia-natural gas engine. The results show that, with the increase of NH 3 , the peak value of in-cylinder pressure and the heat release rate decrease, the NO x emission first increases and then decreases, and the CO 2 emission decreases.…”

Section: Introductionmentioning

confidence: 99%

Effects of Methanol–Ammonia Blending Ratio on Performance and Emission Characteristics of a Compression Ignition Engine

Huang,

Lyu,

Luo

et al. 2023

JMSE

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Sustainable ammonia is one of the leading candidates in the search for alternative clean fuels for marine applications. This paper aims to build a simulation model of a six-cylinder, four-stroke diesel engine to investigate the effects of increasing the ammonia proportion in methanol–ammonia fuel blends on engine performance and emissions. In the present study, the conditions of different speeds and different proportions of ammonia in fuel blends are investigated. The results show that the average effective pressure, brake power, and brake torque increase by about 5% with an increased ammonia substitution ratio. In terms of economic performance, the changes under medium and low speed conditions are not obvious. However, the change in high speed conditions is significant. The brake specific fuel consumption (BSFC) is reduced by 6.6%, and the brake thermal efficiency (BTE) is increased by 4%. It is found that the performance of the engine is best at medium speed. The best performance is achieved with higher efficiency and lower emissions. The present results can provide guidance for the optimization of ammonia–methanol blends and their applications in engines.

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