scholarly journals Preliminary Numerical Study on Exhaust Emission Characteristics of Particulate Matters and Nitrogen Oxide in a Marine Engine for Marine Diesel Oil and Dimethyl Ether Fuel

2020 ◽  
Vol 8 (5) ◽  
pp. 316
Author(s):  
Jinkyu Park ◽  
Iksoo Choi ◽  
Jungmo Oh ◽  
Changhee Lee
Keyword(s):  
Nitrogen Oxide ◽  
Dimethyl Ether ◽  
Alternative Fuels ◽  
Numerical Study ◽  
Alternative Fuel ◽  
Diesel Oil ◽  
Injection System ◽  
Injection Timing ◽  
Marine Engine ◽  
Marine Diesel

As concerns regarding environmental pollution, energy security and future oil supply continue to grow, communities around the world are looking for non-petroleum-based alternative fuels along with advanced energy technologies (e.g., fuel cells) to increase energy use efficiency. Compared with the main alternative fuel candidates (e.g., methane, methanol, ethanol and Fischer–Tropsch fuels), dimethyl ether (DME) seems to have a significant potential to solve the aforementioned problems and can be used as a clean, high-efficiency compressed ignition fuel with reduced nitrogen oxide, sulphur oxide and particulate matter (PM) emissions. In this study, the results of experiments using a ship engine and numerical analysis were verified using AVL BOOST software. Based on these verifications, nitrogen oxide and PM reduction characteristics were numerically analysed by controlling the diameter and spraying time of the fuel nozzle, which is the fuel injection system of a marine engine. When DME fuel was used, nitrogen oxide and PM emissions were reduced by 40% and 90%, respectively, compared with marine diesel oil fuel. To prove the viability of DME as an alternative fuel, combustion and exhaust characteristics were analysed in accordance with injection timing and the variation of nozzle hole.

scholarly journals Effects of Various Fuels on Combustion and Emission Characteristics of a Four-Stroke Dual-Fuel Marine Engine

2021 ◽  
Vol 9 (10) ◽  
pp. 1072
Author(s):  
Van Chien Pham ◽  
Beom-Seok Rho ◽  
Jun-Soo Kim ◽  
Won-Ju Lee ◽  
Jae-Hyuk Choi
Keyword(s):  
Alternative Fuels ◽  
Numerical Study ◽  
Combustion Process ◽  
Simulation Software ◽  
Dual Fuel ◽  
Injection Timing ◽  
Emission Characteristics ◽  
Marine Engine ◽  
Adjustment Method ◽  
Simulation Results

A numerical study was carried out to investigate the effects of methane (CH4), ethane (C2H6), propane (C3H8), butane (C4H10), and dimethyl ether (DME) on the combustion and emission characteristics of a four-stroke gas-diesel dual-fuel (DF) marine engine at full load. Three-dimensional simulations of the combustion process and emission formation inside the engine cylinder in the diesel and DF modes were performed using the AVL FIRE R2018a simulation software to analyze the in-cylinder pressure, temperature, and emission characteristics. The simulation results agreed well with the measured values reported in the engine shop test technical data. The simulation results showed reductions in the in-cylinder peak pressure and temperatures, as well as the emission formations, in the DF modes in comparison to the diesel mode. The DF mode could significantly reduce nitric oxide (NO) emissions (up to 96.225%) of DME compared to the diesel mode. Meanwhile, C3H8 and CH4 fuels effectively reduced the soot (up to 82.78%) and carbon dioxide (CO2) emissions (by 21.33%), respectively, compared to the diesel mode. However, the results also showed longer ignition delay times of the combustion processes when the engine operated in the DF mode, particularly in the DME-diesel mode. The combustion and emission characteristics of the engine were also analyzed when varying the injection timing; the results showed that applying the injection timing adjustment method could further address NO emission problems but led to a decrease in the engine power. Therefore, it is necessary to consider the benefits and disadvantages of adopting the injection timing adjustment strategy to address certain engine emission problems. This study successfully analyzed the benefits of using various gas fuels as alternative fuels and the injection timing adjustment method in DF marine engines to meet the International Maritime Organization (IMO) emission regulations without the use of any emission after-treatment devices.

scholarly journals Numerical Study on Nitrogen Oxide and Black Carbon Reduction of Marine Diesel Engines Using Emulsified Marine Diesel Oil

2019 ◽  
Vol 11 (22) ◽  
pp. 6347 ◽  
Author(s):  
Iksoo Choi ◽  
Changhee Lee
Keyword(s):  
Particulate Matter ◽  
Nitrogen Oxides ◽  
Nitrogen Oxide ◽  
Black Carbon ◽  
Combustion Temperature ◽  
Numerical Study ◽  
Reduction Rate ◽  
Diesel Oil ◽  
Carbon Reduction ◽  
Marine Diesel

In this study, the exhaust gas characteristics of marine diesel oil (MDO) and emulsion fuels, which are currently used to reduce nitrogen oxides and particulate matters emitted from ship engines, were investigated through experimental and numerical analyses. The moisture included in the emulsion fuel primarily promotes the atomization of fuel due to microexplosion, and lowers the combustion temperature due to the latent heat of evaporation from the evaporation of moisture, thus reducing nitrogen oxides and particulate matter. In the case of emulsion fuel containing a water content of 16%, the combustion temperature was lowered, and the reduction rate of nitrogen oxide and black carbon was about 60% and 15%, respectively. The proposed method is a combustion control technology that can reduce particulate matter as well as nitrogen oxides by using emulsion fuel.

scholarly journals Nitrogen Oxides and Particulate Matter from Marine Diesel Oil (MDO), Emulsified MDO, and Dimethyl Ether Fuels in Auxiliary Marine Engines

2020 ◽  
Vol 8 (5) ◽  
pp. 322
Author(s):  
Jinkyu Park ◽  
Iksoo Choi ◽  
Jungmo Oh ◽  
Changhee Lee
Keyword(s):  
Particulate Matter ◽  
Nitrogen Oxides ◽  
Dimethyl Ether ◽  
Diesel Oil ◽  
Low Carbon ◽  
Emulsified Fuel ◽  
Marine Vehicles ◽  
Marine Engines ◽  
Marine Diesel ◽  
Chamber Temperature

Exhaust gases from ships and automobiles have a significant impact on people and the environment. As a result, diesel engines used in land and marine vehicles are gradually being restricted, and low-carbon engines are under development. This study considers marine diesel oil (MDO) that is used in ships to meet the emission regulations required by the International Maritime Organization. This investigation explores the method and application technology for the reduction of nitrogen oxides (NOx) and particulate matter using emulsified fuel and mass-produced dimethyl ether (DME) fuel, which are analyzed. When comparing emulsified fuel and DME fuel to MDO, which is a ship oil, NOx are reduced by 20–45% and the particulate matter is reduced by 60–97%. When emulsified fuel containing moisture is used, the combustion chamber temperature is lowered due to the optimal expansion by moisture contained in the fuel. The particulate matter is also reduced. When DME fuel is used, it reduces the particulate matter by more than 97% in comparison with the existing MDO fuel and the emulsified fuel. The conditions are believed to be suitable for combustion and they can be satisfied by supplying oxygen during post-combustion.

scholarly journals Model tests of a marine diesel engine powered by a fuel-alcohol mixture

2021 ◽  
Author(s):  
Marcin Zacharewicz ◽  
Tomasz Kniaziewicz
Keyword(s):  
Mathematical Model ◽  
Diesel Engine ◽  
Alternative Fuels ◽  
Fossil Fuels ◽  
Diesel Oil ◽  
Marine Diesel Engine ◽  
Engine Model ◽  
Marine Engines ◽  
Marine Diesel ◽  
The Mathematical Model

The paper presents the results of model and empirical tests conducted for a marine diesel engine fueled by a blend of n-butanol and diesel oil. The research were aimed at assessing the usefulness of the proprietary diesel engine model in conducting research on marine engines powered by alternative fuels to fossil fuels. The authors defined the measures of adequacy. On their basis, they assessed the adequacy of the mathematical model used. The analysis of the results of the conducted research showed that the developed mathematical model is sufficiently adequate. Therefore, both the mathematical model and the computer program based on it will be used in further work on supplying marine engines with mixtures of diesel oil and biocomponents.

scholarly journals Characteristics of modeling hydrodynamic processes of fuel supply in operation of marine diesel using water-fuel emulsion

2020 ◽  
Vol 2020 (2) ◽  
pp. 54-61
Author(s):  
Gennady Bentsianovich Gorelik ◽  
Oleg Nikolaevich Mozolev
Keyword(s):  
High Pressure ◽  
Steady State ◽  
Diesel Fuel ◽  
Alternative Fuels ◽  
Alternative Fuel ◽  
Telegraph Equation ◽  
Maximum Pressure ◽  
Fuel Supply ◽  
Marine Diesel

The article presents the results of mathematical modeling of the fuel supply process of a marine diesel working on diesel fuel and water-fuel emulsion with a water content of 30% as an alternative fuel. There have been found the specific features of fuel supply and the influence of the alternative fuel on the injection characteristics of standard fuel supply equipment during operation in nominal and partial modes. In evaluating the quality of fuel equipment operation on a water-fuel emulsion there were taken into account the following facts: changing of the fuel supply characteristics; changing injection parameters; type of fuel spraying in the initial and final phases of injection and reduction of fuel proportion supplied during the needle landing period; greater stability of successive injection cycles by increasing the active stroke of the plunger by 25-30%; features of injection processes due to thermal explosion effect. The telegraph equation for the unsteady fuel motion in a high pressure pipeline is obtained. The operation parameters of a marine diesel engine 6CHSPN2A 18/22 (DRA-300) are considered in nominal mode according to the screw characteristic for diesel fuel and water-fuel emulsion: plunger stroke of the high-pressure fuel pump; maximum pressure of the steady state in the connecting pipe; average integral pressure of the steady state in the nozzle, which determines the quality of spraying, the speed of landing of the sprayer needle on the saddle; amount of fuel supplied during the needle landing period; cyclic fuel supply; duration of the main injection; stability criterion of fuel supply processes in successive cycles, etc. It has been inferred that water-fuel emulsions can take a separate place in the list of alternative fuels, which will contribute to improving the quality of traditional fuels, productive burnout of hydrocarbon, nitrogen-hydrogen mixture, spirit mixtures, etc. due to the rational introducing additives into fuel, increasing the reliability indicators of cylinder-piston parts, etc.

Preliminary Study on Tribological Performance of Straw Based Bio-Fuel

2007 ◽  
Author(s):  
Yufu Xu ◽  
Qiongjie Wang ◽  
Xianguo Hu ◽  
Jinsi Chen
Keyword(s):  
Internal Combustion Engine ◽  
Alternative Fuels ◽  
Combustion Engine ◽  
Frictional Coefficient ◽  
Internal Combustion ◽  
Alternative Fuel ◽  
Diesel Oil ◽  
Chemical Compositions ◽  
Extreme Pressure ◽  
Ball Surface

More and more attention has been paid to alternative fuel in internal combustion engine. One of alternative fuels is to convert straw biomass to biomass fuel. Various methods and apparatuses used for converting straw biomass to bio-fuel were invented and developed. However, alternative fuel from biomass can not be used well in internal combustion engine. The reason is complicated and relative with the separation technology of bio-fuel and corrosion, wear, lubrication and combustion chemical reaction between bio-fuel and the surface of combustion room. It is necessary to study the tribological properties of bio-fuel in order to instead the current gasoline or diesel oil in internal combustion engine in the future. In the present study, the straw based bio-oil obtained by liquidizing process was chosen to evaluate its lubrication by MQ-800 fourball tribometer, in which extreme pressure and friction coefficient and wear resistance were measured respectively. The experimental results showed that the extreme pressure of the bio-fuel was up to 392 N, and the extreme pressure of diesel oil was 333 N. The frictional coefficient of bio-fuel varies between 0.08 and 0.11. The wear scar diameter increased with load slowly in 30min. SEM images indicate that lots of thin and dense belt-like ploughs were presented on the rubbed ball surface. The chemical compositions of the worn zone on the ball surface were analyzed by XPS, the thermal property and variation of chemical compositions of bio-fuel before and after friction and wear tests were studied by TGA and GC-MS, respectively. It was shown that the rubbing surface film was composed of FeS, FeSO4 and organic compounds with C-C, −COH and −COOH groups.

scholarly journals Performance of an agricultural engine using mineral diesel and ethanol fuels

2017 ◽  
Vol 47 (3) ◽  
Author(s):  
Marcelo Silveira de Farias ◽  
◽  
José Fernando Schlosser ◽  
Alexandre Russini ◽  
Ulisses Giacomini Frantz ◽  
...  
Keyword(s):  
Alternative Fuels ◽  
Fuel Injection ◽  
Engine Performance ◽  
Diesel Oil ◽  
Injection System ◽  
Performance Parameters ◽  
Global Demand ◽  
Speed Range ◽  
Environmental Requirements ◽  
Agricultural Use

ABSTRACT: The global demand for alternatives for mineral diesel oil is growing due to the need for satisfying sustainability and environmental requirements, forcing industries and research institutions to develop new alternative fuels. The objective of this study was to evaluate the performance parameters of an agricultural engine using two different fuels: mineral diesel oil and ethanol. The experiment was conducted on a dynamometric stand using two engines for agricultural use but with a modified fuel injection system, suitable for both diesel and ethanol, in the speed range 1200-2300rpm. The performance of the engines was analyzed considering the power take-off from the tractors for each fuel, as established in the standard NBR ISO 1585. The data obtained showed that at the working speed that provides 540rpm at the power take-off, the engine performance changed when powered by ethanol, with a reduction in the maximum power and increased specific fuel consumption.

A Review of Biodiesel Appication on Marine Engine

2013 ◽  
Vol 448-453 ◽  
pp. 1660-1664
Author(s):  
De Fu Zhang ◽  
Hui Chao Xiao ◽  
Xiao Chuan Zhang
Keyword(s):  
Supply Chain ◽  
Nitrogen Oxide ◽  
Experimental Research ◽  
Production Cost ◽  
Alternative Fuels ◽  
Internal Combustion ◽  
Nitrogen Oxide Emission ◽  
Marine Engine ◽  
Practical Applications ◽  
Feedstock Production

The classification and fuel properties were stated for the alternative fuels applied on the internal combustion (I.C.) engines. The studies concerning biodiesel as fuel operating on marine engine were presented in this paper. Major obstacles in biodiesel application such as biodiesel compatibility, feedstock, production cost, supply chain and nitrogen oxide emission from engines were investigated based on experimental research and practical applications onboard ship and the feasible strategy were explored.

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