Effects of ammonia energy fraction on combustion stability and emissions characteristics of naturally aspired industrial dual-fuel diesel engine

Abstract

• Combustion characteristics and emissions of a NH 3 -diesel in IC dual fuel internal combustion engine. • Analysis of the heat release and in-cylinder pressure for different energy fractions of NH 3 . • Increase in the share of NH 3 in the burned fuels resulted in a decrease in GHG. • Increase in the share of NH 3 in the combustible mixture decreased soot emissions. • Analysis of the influence of ammonia fraction on combustion stability. In the era of reducing the combustion of fossil fuels and caring for the natural environment, the search for new environmentally friendly fuels is underway. Limiting GHG emissions is possible by phasing out carbon-based fuels. Ammonia is a very promising zero-carbon fuel and serves as a good carrier for hydrogen. However, due to its high auto-ignition temperature, it requires the use of additional fuel with higher reactivity to initiate ignition. In this study, ammonia was used as a substitute for diesel fuel to power an industrial compression-ignition engine. The results obtained indicated that NH 3 does not cause a significant increase in cylinder pressure and improves combustion efficiency. An increase in peak heat release rate was observed. Increasing the proportion of NH 3 up to 23% slightly shortened the ignition delay time and then prolonged it for higher NH 3 proportions. The combustion duration increased with the increasing proportion of ammonia. It was found that with the increase in NH 3 proportion, the variability of the 50% heat release angle (CA50) and the arbitrary end of combustion (CA90) increased, while it did not affect the repeatability of the start of combustion (CA10). It has a favorable effect on specific energy consumption and engine efficiency. The inclusion of ammonia has a very beneficial effect on soot emissions.

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