The Use of Exhaust Gas Recirculation for Ensuring the Environmental Performance of Marine Diesel Engines

Madey

et al. 2022

JMSE

In this study, a method for ensuring reliable and safe operation of marine trunk diesel engines is considered. The research was carried out on 5L23/30 MAN-B&W diesel engines of a Bulk Carrier class vessel. The objective of the study was to determine the effect of the structural characteristics of the oil layer (wetting angle and thickness) on the operational parameters of a marine diesel engine (compression pressure, concentration of nitrogen oxides in exhaust gases and temperature of exhaust gases after the cylinder) and performance characteristics of the oil (base number, wear and contaminant elements). It has been established that an increase in the degree of the contact angles of wetting and in the thickness of the oil layer improves the heat and power and environmental performance of a diesel engine. At the same time, the decrease in compression pressure in the cylinder slows down, the temperature of gases after the cylinder decreases, and the emission of nitrogen oxides with exhaust gases decreases. Also, it was found that wear of diesel parts and oil oxidation are reduced. The study confirms the possibility of improving the reliable and safe operation of trunk-type diesel engines of maritime vessels by effective control of variables relating to the characteristics of engine oil.

Section: Resultsmentioning

confidence: 99%

Ensuring Reliable and Safe Operation of Trunk Diesel Engines of Marine Transport Vessels

Madey

et al. 2022

JMSE

“…During ultrasonic treatment in a fluid flow, there is a pulse increase and decrease in pressure in the local volumes of the fluid. This, as well as the provision of turbulent motion, leads to an increase in the homogeneity of the liquid and the prevention of sediment of heavy components that make up its composition [17,18].…”

Section: Research Of Existing Solutions To the Problemmentioning

confidence: 99%

“…These areas (S 0 6 , S 6 12 , S 12 18 , S 18 24 , S 24 30 , S 30 36 ) can be calculated as the areas of the corresponding trapezoids [4,23]. The values of the trapezoid areas (which characterize the density stratification of the drilling fluid along the depth TECHNOLOGY AUDIT AND PRODUCTION RESERVES -№ 5/2(61), 2021…”

Section: Tablementioning

confidence: 99%

Development of a method for maintaining the performance of drilling fluids during transportation by Platform Supply Vessel

Maryanov

2021

TAPR

The object of research is the process of transportation of drilling fluid used for lubrication and cooling of drilling equipment of offshore oil production platforms. The subject of the study is the stratification of the density of the drilling fluid along the height of the cargo tank in which it is transported. The technology of transportation of drilling fluid on the Platform Supply Vessel is considered. A problematic point in ensuring this process is that during the transportation of drilling fluids, due to the action of gravitational forces on organic and inorganic compounds in their volume, there is a latent change in their dispersion over the volume of the fluid. This leads to the stratification and stratification of the fluid density along the height, as well as to the formation of sediments at the bottom of the cargo tanks, in which the drilling fluid is transported. The study is aimed at developing a technology that maintains a constant value of the density of the drilling fluid along the depth of the tank in which it is transported. The studies were carried out in the vessel system for transporting drilling fluid of a specialized marine vessel of the Platform Supply Vessel type with a deadweight of 5850 tons. It is experimentally established that for a transportation time of 6–36 hours, the density stratification of the drilling fluid is 3.04–32.04 %. As a method that ensures the minimum stratification of the density of the drilling fluid during its transportation, it is proposed to use an additional X-shaped circulation of the drilling fluid in the volume of adjacent cargo tanks. Studies have confirmed that the density stratification over a time period of 6–36 hours decreases to a range of 2.30–9.01 %. The complex use of additional X-shaped circulation and simultaneous air supply to the bottom of the cargo tank provides a density stratification value of 0.73–2.93 %. The proposed technology was tested on a specialized seagoing vessel of the Platform Supply Vessel type with a deadweight of 5850 tons and can be used on offshore vessels that ensure the operation of offshore oil production platforms.

“…One of the options for reducing diesel engine fuel consumption and emissions is using a various upgrades and modifications which can also increase the efficiency of the whole system (diesel engine + upgrade) [18,19]. Such upgrades can be performed on the diesel engine [20] or can be installed as an additional component with some kind of connection to diesel engine [21].…”

Section: Introductionmentioning

confidence: 99%

Exergy Analysis of Supercritical CO2 System for Marine Diesel Engine Waste Heat Recovery Application

Mrzljak,

Jelić,

Poljak

et al. 2023

JMTS

In this research is performed an exergy analysis of supercritical CO2 system which uses various waste heat flows from marine diesel engine to produce additional mechanical power. The performed exergy analysis contains whole system as well as each system component individually. The observed system produces useful mechanical power equal to 2299.47 kW which is transferred to the main propulsion propeller shaft. Additionally produced mechanical power by using waste heat only will reduce marine diesel engine fuel consumption and exhaust gas emissions. Main cooler has the highest exergy destruction of all system components and simultaneously the lowest exergy efficiency in the observed system, equal to 32.10% only. One of the possibilities how main cooler exergy efficiency can be increased is by decreasing water mass flow rate through the main cooler and simultaneously by increasing water temperature at the main cooler outlet. Observed system has five heat exchangers which are involved in the CO2 heating process, and it is interesting that the last CO2 heater (exhaust gas waste heat exchanger) increases the CO2 temperature more than all previous four heat exchangers. Whole analyzed waste heat recovery supercritical CO2 system has exergy destruction equal to 2161.68 kW and exergy efficiency of 51.54%. In comparison to a similar CO2 system which uses waste heat from marine gas turbine, system analyzed in this paper has approximately 12% lower exergy efficiency due to much lower waste heat temperature levels (from marine diesel engine) in comparison to temperature levels which occur at the marine gas turbine exhaust.