doi: 10.52899/24141437_2026_01_31
UDK: 620-9, 504-03

Optimal Operating Parameters of Ejectors for Marine Diesel Power Plants

Салова Т. Ю., Смирнов Д. В., Рыбников А. В., Красножон П. А.
Article language:
Citation Link: Salova TYu, Rybnikov AV, Krasnozhon PA, Smirnov DV. Optimal operating parameters of ejectors for marine diesel power plants. Transactions of the Saint Petersburg State Marine Technical University. 2026;5(1):31–39. DOI: 10.52899/24141437_2026_01_31 EDN: FQCVMK

Annotation

BACKGROUND: MARPOL 73/78 regulations require the prevention of maritime air pollution, including any marine diesel engines. When implementing means to increase the capacity of marine diesel power plants and to comply with international requirements, it is required to develop and implement devices designed to reduce harmful substance concentrations in the exhaust gases of diesel power plants of ships and vessels under various operating conditions. AIM: To create and improve the exhaust gas aftertreatment system for marine diesel power plants; to examine the operating parameters of the gas ejector at different ejection ratios, and to determine the ratio of the central hole area S2 to the annular hole area S1 of the ejector washer for a given diameter of the mixing chamber D3. METHODS: The most promising methods for reducing the emission toxicity include the exhaust gas NO aftertreatment system as part of the exhaust system of marine diesel power plants. The proposed gas ejector neutralizes toxic components of exhaust gases. RESULTS: The dimensions of the ejector are determined, as well as the optimal conditions for neutralization of nitrogen oxides of exhaust gases; an algorithm for calculating the operating parameters of the proposed gas ejector is constructed. Based on the calculation results, the values of the flow velocity of the gas ejector were selected to obtain optimal pressure values in it. CONCLUSION: The resulting models showed that the ejected gas should be caught at the mixing chamber outlet. The ejector cross-sectional area ratio ensures a sufficient turbulence. The ejector gas static pressure at the mixing chamber inlet is less than the total pressure of the ejected gas, which ensures exhaust gas recirculation and the supply of reducing gas (ammonia) to the mixing chamber. The study determined optimal operating parameters of the ejector. It was concluded that there is a need in additional GE field studies to refine the ratios of flow parameters that ensure the uttermost use of the ejector mixing chamber. Keywords: marine diesel power plants; harmful substances; exhaust gases; NOx; gas ejector.

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