Ammonia marine engine design for enhanced efficiency and reduced greenhouse gas emissions
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View abstract on PubMed
Summary
This summary is machine-generated.This study introduces in-cylinder reforming gas recirculation for ammonia engines, significantly boosting thermal efficiency and cutting emissions like unburned ammonia and N2O. This innovation addresses key challenges for cleaner maritime applications.
Area Of Science
- Internal combustion engines
- Alternative fuels
- Emission control technologies
Background
- Pilot-diesel-ignition ammonia engines face challenges with high unburned ammonia (NH3) and N2O emissions.
- Low thermal efficiency limits the practical application of ammonia combustion engines in the maritime sector.
Purpose Of The Study
- To introduce and evaluate a novel concept of in-cylinder reforming gas recirculation.
- To simultaneously enhance thermal efficiency and reduce harmful emissions in pilot-diesel-ignition ammonia engines.
Main Methods
- One cylinder operates rich of stoichiometric, decomposing excess ammonia into hydrogen.
- Exhaust gas from the reforming cylinder is recirculated to other cylinders.
- Combines benefits of hydrogen-enriched combustion and exhaust gas recirculation.
Main Results
- Indicated thermal efficiency increased by 15.8% at 3% diesel energetic ratio and 1000 rpm.
- Unburned NH3 reduced by 89.3% and N2O by 91.2% compared to traditional ammonia engines.
- Carbon footprint reduced by 97.0% and greenhouse gases by 94.0% compared to pure diesel.
Conclusions
- In-cylinder reforming gas recirculation is a viable strategy for improving ammonia engine performance.
- The method effectively tackles key emission and efficiency bottlenecks for ammonia combustion.
- Offers a promising pathway for cleaner and more efficient maritime propulsion.
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