Analysis of Efficiency of the Ship Propulsion System with Thermochemical Recuperation of Waste Heat

Cherednichenko, Oleksandr; Serbin, Serhiy

doi:10.1007/s11804-018-0012-x

Cited by 14 publications

(10 citation statements)

References 17 publications

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“…The method proposed in [12] provides an increase in the effective power of a diesel engine. At the same time, its implementation requires significant changes in the engine cooling system.…”

Section: Research Of Existing Solutions To the Problemmentioning

confidence: 99%

Analysis of mechanical energy losses in marine diesels

Sagin

Madey

Stoliaryk

2021

TAPR

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The object of research is marine diesel engine oils, which provide lubrication, cooling and separation of friction surfaces. The subject of the research is the process of ensuring minimum mechanical losses in marine diesel engines. A problematic point in ensuring the lubrication of the cylinder-piston group and motion bearings is the lack of analytical and experimental studies that establish the relationship between the structural characteristics of engine oils and mechanical losses arising in marine internal combustion engines. The degree of orientational ordering of molecules and the thickness of the boundary lubricating layer are considered as the structural characteristics of engine oils. The determination of these values was carried out using the optical method based on the anisotropy of the light absorption coefficient by the boundary lubricant layer and the isotropic volume of the liquid (engine oil). The assessment of the level of mechanical losses arising in marine diesel engines was carried out according to an indirect indicator – the overshoot of the rotational speed and the time to reach the steady state of operation in the event of a change in load. It has been experimentally established that for engine oils used in marine internal combustion engines, the thickness of the boundary layer can be 15–17.5 µm. Motor oils, which are characterized by a higher ordering of molecules and a thickness of the boundary lubricant layer, ensure the flow of transient dynamic processes with less overshoot and a shorter transient time. This ensures the level of minimal mechanical losses occurring in marine diesel engines. The technology for determining the structural characteristics of engine oils can be used for any type and grade of oil (mineral or synthetic; high or low viscosity; used in both circulating and cylinder lubrication systems). The method of indirect assessment of mechanical losses of marine diesel engines can be used for any types of internal combustion engines of ships of sea and river transport (low-, medium- and high-speed; as well as performing the functions of both main and auxiliary engines).

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“…The method proposed in [12] provides an increase in the effective power of a diesel engine. At the same time, its implementation requires significant changes in the engine cooling system.…”

Section: Research Of Existing Solutions To the Problemmentioning

confidence: 99%

Analysis of mechanical energy losses in marine diesels

Sagin

Madey

Stoliaryk

2021

TAPR

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“…Two 250 kW high-temperature SOFC systems working with methanol were integrated within the ship supplying electrical energy. Cherednichenko and Serbin (2018) and Cherednichenko et al (2019) analysed the capabilities of thermo-chemical technologies for the conversion of different hydrocarbons on ships. As reported by Sun et al (2010), the SOFC-GT system for the Large Medium Speed Roll-on/Rolloff sealift ship has significant potential in reducing nitrogen oxides emission and fuel consumption.…”

Section: Intoductionmentioning

confidence: 99%

Application analysis of a hybrid solid oxide fuel cell-gas turbine system for marine power plants

Serbin

Washchilenko

Cherednichenko

et al. 2021

Ships and Offshore Structures

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The results of theoretical studies of the possibilities of using hybrid solid oxide fuel cell-gas turbine (SOFC-GT) systems for marine power plants are presented. A 500 kW auxiliary marine power plant scheme using stacks of SOFCs in combination with a regenerative gas turbine operating with overexpansion based on our recent patent application is proposed. The results of mathematical modelling showed the opportunity to obtain a hybrid scheme efficiency of about 55% with the optimal values of the gas turbine compression ratio 2.0-2.2 and the exhauster compressor ratio 1.3-1.4. The application of the considered hybrid SOFC-GT system gives an increase in electrical efficiency by 19% in comparison with a cycle without a gas turbine. The aerodynamic structure of chemically reacting flows in a combustor is determined, as well as the features of the formation of toxic components during the combustion of SOFC off-gas with very low heating value.

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“…The available exhaust gas temperature of modern gas turbine engines ranges from 620 to 850 K. It makes possible the partial conversion of hydrocarbon fuels (natural gas, diesel fuel, butane, propane, ethane, etc.) as well as effective alcohol fuel (methanol and ethanol) conversion [18,19]. The study of the efficient methanol steam conversion is of particular interest.…”

Section: Steam Alcohol Conversionmentioning

confidence: 99%

“…Therefore, waste heat recovery systems are of great importance for the above engines. There are several heat recovery methods, which increase the fuel economy of power plants and reduce harmful emissions [17][18][19][20][21][22]: thermo-electric energy conversion; organic Rankin cycle; and thermochemical technologies. A promising pathway to recover waste heat is to apply thermo-chemical recuperation-endothermic alcohol steam reforming, using exhaust gas energy [23,24].…”

Section: Introductionmentioning

confidence: 99%

Local Green Power Supply Plants Based on Alcohol Regenerative Gas Turbines: Economic and Environmental Aspects

et al. 2020

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Growing economies need green and renewable energy. Their financial development can reduce energy consumption (through energy-efficient technologies) and replace fossil fuels with renewable ones. Gas turbine engines are widely used in transport and industry. To improve their economic attractiveness and to reduce harmful emissions, including greenhouse gases, alternative fuels and waste heat recovery technologies can be used. A promising direction is the use of alcohol and thermo-chemical recuperation. The purpose of this study is to estimate the economic efficiency and carbon dioxide emissions of an alcohol-fueled regenerative gas turbine engine with thermo-chemical recuperation. The carbon dioxide emissions have been determined using engine efficiency, fuel properties, as well as life cycle analysis. The engine efficiency was maximized by varying the water/alcohol ratio. To evaluate steam fuel reforming for a certain engine, a conversion performance factor has been suggested. At the optimal water/methanol ratio of 3.075 this technology can increase efficiency by 4% and reduce tank-to-wake emission by 80%. In the last 6 months of 2019, methanol prices were promising for power and cogeneration plants in remote locations. The policy recommendation is that local authorities should pay attention to alcohol fuel and advanced turbines to curb the adverse effects of burning petroleum fuel on economic growth and the environment.

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Analysis of Efficiency of the Ship Propulsion System with Thermochemical Recuperation of Waste Heat

Cited by 14 publications

References 17 publications

Analysis of mechanical energy losses in marine diesels

Analysis of mechanical energy losses in marine diesels

Application analysis of a hybrid solid oxide fuel cell-gas turbine system for marine power plants

Local Green Power Supply Plants Based on Alcohol Regenerative Gas Turbines: Economic and Environmental Aspects

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