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  1. Home
  3. Numerical Investigation Of The Effects Of Adding Different Gases On The Performance And Emissions Of An Ammonia-hydrogen Dual-fuel Engine.
  1. Home
  3. Numerical Investigation Of The Effects Of Adding Different Gases On The Performance And Emissions Of An Ammonia-hydrogen Dual-fuel Engine.

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Numerical investigation of the effects of adding different gases on the performance and emissions of an

Mahdi Aboujafari1

  • 1Faculty of Mechanical Engineering, Semnan University, Semnan, Iran.

Journal of Environmental Management
|August 11, 2024

View abstract on PubMed

Summary
This summary is machine-generated.

Adding nitrogen or argon to ammonia-hydrogen dual-fuel engines during combustion can reduce harmful emissions. This study numerically investigated the impact of various gas additions on engine performance and NOx levels.

Keywords:
AmmoniaCombustionDual-fuel engineEmissionsHydrogen

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Area of Science:

  • * Internal Combustion Engines
  • * Alternative Fuels
  • * Combustion Chemistry

Background:

  • * Ammonia is a promising alternative to fossil fuels, offering advantages over hydrogen in combustion systems.
  • * Ammonia-hydrogen dual-fuel engines require ignition promoters like hydrogen for stable combustion.
  • * High nitrogen oxide (NOx) emissions are a significant challenge for ammonia combustion.

Purpose of the Study:

  • * To numerically investigate the effects of adding different gases (argon, nitrogen, carbon dioxide, oxygen) on the performance and emissions of an ammonia-hydrogen dual-fuel engine.
  • * To evaluate the impact of gas addition timing relative to ammonia injection on combustion characteristics.
  • * To identify optimal gas additives for reducing NO and NO2 emissions without compromising engine performance.

Main Methods:

  • * Numerical simulation of a modified diesel engine operating on ammonia-hydrogen fuel.
  • * Implementation of a combustion mechanism in Cantera, coupled with a MATLAB code for solving governing equations.
  • * Parametric study involving injection of various gases at different crank angles relative to ammonia injection.

Main Results:

  • * Carbon dioxide addition negatively impacted peak in-cylinder pressure and NO/NO2 emissions.
  • * Oxygen addition showed adverse effects on emissions.
  • * Nitrogen and argon addition during ammonia injection (350-370 CAD) effectively reduced NO and NO2 emissions.
  • * These reductions were achieved with minimal adverse effects on peak in-cylinder pressure and temperature.

Conclusions:

  • * Nitrogen and argon are effective additives for mitigating NOx emissions in ammonia-hydrogen dual-fuel engines.
  • * The timing of gas injection is crucial for optimizing emission reduction strategies.
  • * Further research can leverage these findings to develop cleaner ammonia-based combustion technologies.