With the environmental pollution by exhaust products of combustion becoming more and more significant, ever-increasing environmental requirements are forcing engine manufacturers to strive to improve the efficiency of engines and to ensure their environmental safety. The article presents the scheme of the ship power plant with the closed gas-flop system. While implementing the closed system, diesel engine exhaust gases are cooled, water vapor is removed by condensation, filtered from solid particles and mixed with oxygen from the air. The resulting artificial gas mixture is then heated and sent to the diesel inlet. Oxygen from the atmospheric air is released by a molecular sieve. In order to increase the degree of working fluid thermal energy use, it is proposed to inject water into the exhaust gases at the end of the combustion process. The resulting water vapor will reduce the temperature in the cylinder and possibly increase the pressure. Expansion will occur to a lower temperature. At the same time, the temperature decrease in the cylinder should not worsen the expansion process parameters, as the introduction of an additional working fluid should result in the internal energy of the combustion products transforming into the potential energy of water vapor, which will increase the expansion process. The amount of water to be injected shall be such as to keep the steam in the cylinder at the end of the expansion process overheated, and the temperature at the end of the expansion process lower than that in the Trinkler cycle. As the average temperature of the cycle decreases, there are prerequisites to influence the cylinder adiabatically. The proposed measures will reduce the emission of nitrogen oxides and unburned hydrocarbons in the exhaust of marine, stationary and transport engines and improve their energy efficiency and environmental safety.

Keywords: a closed gas exhaust system, energy efficiency, environmental safety, emission of nitrogen oxides, thermodynamic cycle, working process, artificial gas mixture.

UDC 621.436.24

About authors:  

A.F. Dorokhov - DSc, professor, Federal State Educational Institution of Higher Professional Education "Astrakhan State Technical University", Astrakhan, e-mail: e-mail: dorokhovaf@rambler.ru

S.A. Kargin - Caspian Institute of Sea and River Transport, Branch of the Volga State University of Water Transport, Astrakhan, e-mail: serjxxx@inbox.ru

Pages: 96-105

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For citation: A.F. Dorokhov, S.A. Kargin. Marine diesels with closed gas exhaust and thermodynamic cycle analysis. Research Bulletin by Russian Maritime Register of Shipping. 2019, No. 54/55, pp. 96-105.