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author = {Kual, B and Tyrewala, D and Curran, S and Prikhodko, V},
title = {NH3 Dual-Fuel Combustion Emissions in a 4-stroke Marine Diesel Engine},
year = {2025},
month = {may},
pages = {30},
publisher = {Oak Ridge National Laboratory},
keywords = {Ammonia, Engine Testing and Performance, Ocean-going Vessels},
}
RIS
TI - NH3 Dual-Fuel Combustion Emissions in a 4-stroke Marine Diesel Engine
AU - Kual, B
AU - Tyrewala, D
AU - Curran, S
AU - Prikhodko, V
AB - The presentation evaluates ammonia as a dual‑fuel for 4‑stroke marine diesel engines, highlighting its potential for deep greenhouse‑gas reductions through high ammonia substitution but also the significant challenges posed by its poor autoignition properties, slow flame speed, material compatibility issues, and toxic handling requirements. Experiments on a single‑cylinder Cummins ISB platform demonstrate that while high loads can achieve over 90% ammonia energy substitution with diesel‑like efficiency and large reductions in CO₂‑equivalent emissions, low‑load operation produces substantial N₂O, a potent greenhouse gas, alongside elevated engine‑out NOₓ and NH₃ that necessitate optimized aftertreatment. Results show that selective catalytic reduction (SCR) systems can reduce NOₓ and ammonia slip under certain conditions, though further tuning is needed to balance competing reactions and minimize N₂O formation. Additional findings include nonlinear soot reduction using bio‑pilot fuels, significant unburned fuel slip likely involving partial ammonia‑to‑hydrogen reforming, and notably reduced heat‑transfer losses, underscoring both the promise and technical hurdles of deploying ammonia dual‑fuel combustion in marine applications.
DA - 2025/05//
PY - 2025
SP - 30
PB - Oak Ridge National Laboratory
LA - English
KW - Ammonia
KW - Engine Testing and Performance
KW - Ocean-going Vessels
ER -
Abstract
The presentation evaluates ammonia as a dual‑fuel for 4‑stroke marine diesel engines, highlighting its potential for deep greenhouse‑gas reductions through high ammonia substitution but also the significant challenges posed by its poor autoignition properties, slow flame speed, material compatibility issues, and toxic handling requirements. Experiments on a single‑cylinder Cummins ISB platform demonstrate that while high loads can achieve over 90% ammonia energy substitution with diesel‑like efficiency and large reductions in CO₂‑equivalent emissions, low‑load operation produces substantial N₂O, a potent greenhouse gas, alongside elevated engine‑out NOₓ and NH₃ that necessitate optimized aftertreatment. Results show that selective catalytic reduction (SCR) systems can reduce NOₓ and ammonia slip under certain conditions, though further tuning is needed to balance competing reactions and minimize N₂O formation. Additional findings include nonlinear soot reduction using bio‑pilot fuels, significant unburned fuel slip likely involving partial ammonia‑to‑hydrogen reforming, and notably reduced heat‑transfer losses, underscoring both the promise and technical hurdles of deploying ammonia dual‑fuel combustion in marine applications.