The article considers ammonia as an alternative to modem fuels. A theoretical lay out of an engine running on ammonia is presented. The article compares ammonia with other alternative fuels, compares ammonia prices with diesel and heavy fuels, analyzes emissions of harmful substances at different stages of ammonia use -production, transportation and combustion on a ship. The novelty of this article is that ammonia is often not considered as an alternative to traditional fuels, competing with hy drogen and natural gas. However, it has a number of advantages, both environmental and technical and economic. The article also discusses 3 methods for converting marine engines to ammonia, 2 of which are applicable to ships already in operation. Comparison of prices for ammonia with other fuels has been made. The use of ammonia makes it possible to reduce the emission of harmful substances into the atmosphere, which is economically justified. The methods of switching to it and increasing the efficiency of the engine are considered. There are no C02 and SOx emissions and NOx is greatly reduced. Ammonia is cheaper than HFО and DO, as well as H2 and LNG. Transferring a marine engine to ammonia is possible by increasing the compression ratio, using forced ignition, and also using it in conjunction with the additives listed in the article.
CO2, SOx, NOx, efficiency, production, transportation and storage, corrosion, combustion, engine lay out
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