scholarly journals Investigation of the characteristics of a marine diesel engine when running on fuel with a water additive

2021 ◽  
Vol 2131 (2) ◽  
pp. 022074
Author(s):  
S Andriushchenko ◽  
S Titov ◽  
G Yur
Keyword(s):  
Diesel Engines ◽  
Environmental Performance ◽  
High Speed ◽  
Gas Purification ◽  
Nitrogen Oxide Emissions ◽  
Engine Operation ◽  
Air Supply ◽  
Operation Process ◽  
Marine Diesel ◽  
Diesel Cylinder

Abstract Currently, environmental specifications of marine diesel engines become more stringent. There are two well-known and popular ways to improve engine environmental performance: the internal method is based on operation process improvement, as well as on the use of various fuel additives or air supply to the diesel cylinder. Another method is external (gas purification using catalysts and filters). The article considers one of these possible ways of reducing nitrogen oxides in marine diesel engines by using a water agent in fuel with various water phase dispersion degrees. The high-speed characteristics of the ship engine operation under various modes using “L” brand diesel fuel and emulsions are given. Studies have shown that when converting diesel from pure fuel to a microheterogenous emulsion (water inclusions’ diameter 5-10 microns), the concentration of NOx decreased by 1.4 times, fuel consumption increased by (4-5) g/(kWh), with an increase in the maximum combustion pressure by 0.7 MPa. The tests have confirmed the effectiveness of using a microheterogenous emulsion to reduce nitrogen oxide emissions.

scholarly journals Performance evaluation of common rail direct injection (CRDI) engine fuelled with Uppage Oil Methyl Ester (UOME)

2015 ◽  
Vol 4 (1) ◽  
pp. 1-10 ◽  
Author(s):  
D.N. Basavarajappa ◽  
N. R. Banapurmath ◽  
S.V. Khandal ◽  
G. Manavendra
Keyword(s):  
Diesel Engine ◽  
Methyl Ester ◽  
Diesel Engines ◽  
High Speed ◽  
Alternative Fuels ◽  
High Pressures ◽  
Fuel Injection ◽  
Injection Timing ◽  
Engine Operation ◽  
Performance And Emission

For economic and social development of any country energy is one of the most essential requirements. Continuously increasing price of crude petroleum fuels in the present days coupled with alarming emissions and stringent emission regulations has led to growing attention towards use of alternative fuels like vegetable oils, alcoholic and gaseous fuels for diesel engine applications. Use of such fuels can ease the burden on the economy by curtailing the fuel imports. Diesel engines are highly efficient and the main problems associated with them is their high smoke and NOx emissions.  Hence there is an urgent need to promote the use of alternative fuels in place of high speed diesel (HSD) as substitute. India has a large agriculture base that can be used as a feed stock to obtain newer fuel which is renewable and sustainable. Accordingly Uppage oil methyl ester (UOME) biodiesel was selected as an alternative fuel. Use of biodiesels in diesel engines fitted with mechanical fuel injection systems has limitation on the injector opening pressure (300 bar). CRDI system can overcome this drawback by injecting fuel at very high pressures (1500-2500 bar) and is most suitable for biodiesel fuels which are high viscous. This paper presents the performance and emission characteristics of a CRDI diesel engine fuelled with UOME biodiesel at different injection timings and injection pressures. From the experimental evidence it was revealed that UOME biodiesel yielded overall better performance with reduced emissions at retarded injection timing of -10° BTDC in CRDI mode of engine operation.

Research on Application of Waste Plastic Disposal of Marine Diesel Engines

2008 ◽  
Vol 45 (04) ◽  
pp. 191-193
Author(s):  
Wei Hai-jun ◽  
Wang Guo-you ◽  
Wang Xiao-rui
Keyword(s):  
Diesel Engines ◽  
Calorific Value ◽  
Diesel Oil ◽  
Fuel Oil ◽  
Advanced Technique ◽  
Engine Operation ◽  
Waste Plastic ◽  
Marine Diesel ◽  
Points Of View ◽  
Research On Application

The purpose of this paper is to study the applicability of thermal processed fuel oil (hereafter called waste plastic disposal, or WPD) of diesel engines using low-quality fuel oil. In the experiment, stability of engine operation and components of exhaust gas, such as NOx and COx, were inspected from basic and applicable points of view. This paper illustrates a new test and result of WPD oil applied to marine diesel engines. In recent years, efforts have to be made to develop an advanced technique for recycling waste plastics in order to use scrapped plastics as fuel for diesel engines. It is very important and necessary for us to cope with the increasing calorific value and to satisfy the growing need of environment protection. The experimental fuel oil is obtained by a mixing of diesel oil, WPD, and water.

A Study on the Numerical Prediction of Heat Release Rate and NOx Production in Medium-Speed Marine Diesel Engines

2003 ◽  
Author(s):  
Joo Youn Kim ◽  
Wook Hyeon Yoon ◽  
Ji Soo Ha
Keyword(s):  
Heat Release ◽  
Diesel Engines ◽  
High Speed ◽  
Digital Camera ◽  
Numerical Results ◽  
Spray Angle ◽  
Nox Formation ◽  
Time Resolved ◽  
Medium Speed ◽  
Marine Diesel

Prediction of the ROHR (rate of heat release) and NOx production in medium-speed marine diesel engines was investigated. The subject of this paper is qualitative and quantitative evaluation of the numerical results. FIRE code v8.1 was used to examine the behavior of spray and combustion phenomena in diesel engine. Wave breakup and Zeldovich models were adopted to describe the atomization characteristics and NOx formation. The spray visualization was performed experimentally in the constant-volume high-pressure chamber to clarify numerical results on the spray characteristics of the spray angle and penetration. Time-resolved spray behaviors were captured by high-speed digital camera. The simulation results were tested with the experimental data of the real engine. Finally, with adjustment of some model constants, reasonable agreements between experimental and simulated results on the ROHR and NOx were shown.

An Experimental Study on Fuel Economy Improvement of a Marine Diesel Engine Using a Sequential Turbocharging System

2018 ◽  
Author(s):  
Hechun Wang ◽  
Xiannan Li ◽  
Yinyan Wang ◽  
Hailin Li
Keyword(s):  
Diesel Engine ◽  
Fuel Economy ◽  
Diesel Engines ◽  
Engine Speed ◽  
Single Stage ◽  
Marine Diesel Engine ◽  
Nox Emissions ◽  
Engine Operation ◽  
Marine Diesel ◽  
High Torque

Marine diesel engines usually operate on a highly boosted intake pressure. The reciprocating feature of diesel engines and the continuous flow operation characteristics of the turbocharger (TC) make the matching between the turbocharger and diesel engine very challenging. Sequential turbocharging (STC) technology is recognized as an effective approach in improving the fuel economy and exhaust emissions especially at low speed and high torque when a single stage turbocharger is not able to boost the intake air to the pressure needed. The application of STC technology also extends engine operation toward a wider range than that using a single-stage turbocharger. This research experimentally investigated the potential of a STC system in improving the performance of a TBD234V12 model marine diesel engine originally designed to operate on a single-stage turbocharger. The STC system examined consisted of a small (S) turbocharger and a large (L) turbocharger which were installed in parallel. Such a system can operate on three boosting modes noted as 1TC-S, 1TC-L and 2TC. A rule-based control algorithm was developed to smoothly switch the STC operation mode using engine speed and load as references. The potential of the STC system in improving the performance of this engine was experimentally examined over a wide range of engine speed and load. When operated at the standard propeller propulsion cycle, the application of the STC system reduced the brake specific fuel consumption (BSFC) by 3.12% averagely. The average of the exhaust temperature before turbine was decreased by 50°C. The soot and oxides of nitrogen (NOx) emissions were reduced respectively. The examination of the engine performance over an entire engine speed and torque range demonstrated the super performance of the STC system in extending the engine operation toward the high torque at low speed (900 to 1200 RPM) while further improving the fuel economy as expected. The engine maximum torque at 900 rpm was increased from 1680Nm to 2361 Nm (40.5%). The average BSFC over entire working area was improved by 7.4%. The BSFC at low load and high torque was significantly decreased. The application of the STC system also decreased the average NOx emissions by 31.5% when examined on the propeller propulsion cycle.

Application of HFRT Methods to Diagnose the Technical Condition of High-Speed Marine Diesel Engines

2015 ◽  
Vol 236 ◽  
pp. 161-168
Author(s):  
Tomasz Lus
Keyword(s):  
Diesel Engines ◽  
High Speed ◽  
Internal Combustion Engines ◽  
Fuel Injection ◽  
Combustion Process ◽  
Technical Condition ◽  
Injection System ◽  
Engine Fuel ◽  
Naval Academy ◽  
Marine Diesel

The paper presents problems related to testing of the technical condition of high-speed marine diesel engines that are not equipped with indicated valves, as it is in the case of larger medium-and low-speed marine internal combustion engines. In this case, in assessment of technical condition of engine fuel injection system and valve gear system a vibration signals (in time / angle domain) analysis modified method called HFRT (High Frequency Resonance Technique) can be used. This method indirectly helps also to evaluate the fuel combustion process in the engine cylinders. The paper presents the theoretical basis of a modified HFRT method, physical implementation of the marine diesel engine system’s analyzer used for marine engines testing built at the Institute of Construction and Operation of Ships at Polish Naval Academy (PNA) in Gdynia. The paper also includes a description of the vibration signal processing methodology and examples of measurements made in the ships conditions for a few selected types of engines.

Electro-Assist Turbo for Marine Turbocharged Diesel Engines

2014 ◽  
Author(s):  
Keiichi Shiraishi ◽  
Venky Krishnan
Keyword(s):  
Permanent Magnet ◽  
Diesel Engines ◽  
High Speed ◽  
Critical Role ◽  
Engine Performance ◽  
Efficient Design ◽  
Permanent Magnet Motor ◽  
Marine Diesel ◽  
Design Integration ◽  
Discharge Pressure

Turbocharged diesel engines are widely used in the marine industry and have a significant impact on global CO2 and NOx emissions. Turbochargers are an integral component of any diesel engine and they play a critical role in their performance. Mitsubishi Heavy Industries (MHI) and Calnetix Technologies have developed a unique technology called the “Electro-Assist Turbo” (EAT). The EAT unit consists of a specially designed high speed permanent magnet motor directly mounted to the turbocharger rotating assembly. The high speed motor applies torque to the turbocharger rotor enabling it maintain or vary rotor speed at low engine exhaust flow rates in order to supply sufficient charge air to maximize engine performance. Turbocharged diesel engines suffer from inherent deficiencies at low engine speeds; there is not enough energy in the exhaust to produce an optimum and readily available level of boost for the engine intake air system at off-design points. This technology proves even more important as the majority of large marine vessels are now operating in a “slow steaming” part throttle mode. To date the majority of marine diesel engines use auxiliary air blowers (AAB) to supply additional air to the engine intake during off design point operation. These AABs are inefficient and not intended nor designed to be used in constant operation. The EAT unit can provide a higher discharge pressure at the same electrical power consumption as an AAB. This more efficient design with higher discharge pressure further improves fuel efficiency and eliminates the need to run an external piece of machinery during operation, thus lowering maintenance costs. This paper will provide an overview of the design, integration and initial testing of the 100kW Electro-Assist Turbo into a Mitsubishi Exhaust-gas Turbocharger (MET)-83 marine diesel turbocharger. In addition this paper will go over the custom designed aerodynamic motor housing structure that holds the non-rotating components without penalizing performance of the turbocharger, special software developed for the variable frequency drive system that enables the flexible operation of the high speed motor, and features of the high speed permanent magnet motor that allows for operation without any active cooling. Also, this paper will provide and discuss the initial test results of the EAT integrated into the MET-83 turbocharger along with engine testing results provided by MHI. Low cost designs will be discussed that enable turbochargers currently in operation to be retrofitted and the further improvements taking place to commercialize.

scholarly journals Выбор индекса производительности центробежного сепаратора для комбинированных маслоочистительных комплексов судовых тронковых дизелей

2020 ◽  
Vol 45 (4) ◽  
Author(s):  
Keyword(s):  
Diesel Engines ◽  
Performance Index ◽  
High Speed ◽  
Engine Oil ◽  
Lubricating Oil ◽  
Lubrication System ◽  
Centrifugal Separator ◽  
Resource Saving ◽  
Marine Diesel ◽  
Engine Wear

Показана перспективность комбинированной очистки моторного масла в судовых тронковых дизелях с использованием саморегенерирующихся фильтров и сепараторов. Этот метод очистки особенно эффективен для форсированных высокоавтоматизированных двигателей с низким угаром масла, работающих на высоковязких остаточных топливах. Обосновывается важность надежной защиты подшипников двигателя от абразивного изнашивания полнопоточным фильтрованием масла. Центробежный сепаратор, работающий по байпасной схеме, эффективно удаляет из системы смазки мелкодисперсную фазу нерастворимых загрязнений, что обеспечивает функционирование и повышает автономность саморегенерирующегося фильтра, а также замедляет старение смазочного масла. Доказывается необходимость подбора сепаратора по удельному индексу производительности, обеспечивающему ресурсосберегающее маслоиспользование в системе «дизель–топливо–масло– очистка». Новизна экспериментального моделирования эффективности этой системы состоит в оценке с помощью лабораторной моторной установки трибологических показателей отработавшего в судовом дизеле смазочного масла, отражающих взаимодействие звеньев рассматриваемой системы, и установлении их связи с изнашиванием двигателя. Эффективность системы идентифицирована по критерию изнашивания дизеля, что позволяет использовать ее расчетно-экспериментальную модель для определения параметров центробежного сепаратора – с тем, чтобы он удовлетворял требованиям рассматриваемых взаимодействующих звеньев. Модель трансформирована в выражение для расчета удельного, приходящегося на единицу мощности двигателя индекса производительности сепаратора, обеспечивающего минимальное изнашивание двигателя, бессменную работу смазочного масла и автономный срок службы саморегенерирующегося фильтра не менее 3 тыс. ч. Полученные рекомендации по подбору сепаратора в системе смазки двигателя с полной реализацией достоинств автоматизированной тонкой очистки моторного масла комбинированием фильтрования и центрифугирования применимы для судовых дизелей средней и повышенной частоты вращения мощностью до 20 тыс. кВт. Ключевые слова: ресурсосберегающее маслоиспользование, саморегенерирующийся фильтр, центробежный сепаратор, изнашивание дизеля, комбинированная очистка масла, смазочная система, индекс производительности сепаратора, оптимизация сепарирования масла The prospects of combined cleaning of engine oil in ship trunk diesel engines using self-regenerating filters and separators are shown. This cleaning method is especially effective for high-powered, highly automated engines with low oil waste, operating on high-viscosity residual fuels. The importance of reliable protection of engine bearings from abrasive wear by full-flow oil filtration is substantiated. The centrifugal separator, operating according to the bypass scheme, effectively removes the finely dispersed phase of insoluble contaminants from the lubrication system, which ensures the functioning and increases the autonomy of the self-regenerating filter, and also slows down the aging of the lubricating oil. The necessity of selecting a separator according to the specific performance index, which ensures resource-saving oil use in the “dieselfuel-oil-cleaning” system, is proved. The novelty of the experimental modeling of the efficiency of this system consists in evaluating the tribological indicators of the lubricating oil used in a marine diesel engine, reflecting the interaction of the links under consideration, on a laboratory motor unit, and establishing their connection with engine wear. The efficiency of the presented system is identified by the criterion of diesel wear, which makes it possible to use its computational and experimental model to determine the parameters of a centrifugal separator so that it meets the requirements of the considered interacting links. The model has been transformed into an expression for calculating the specific index of the separator performance per unit of engine power, which ensures minimum engine wear, permanent operation of the lubricating oil and an autonomous service life of a self-regenerating filter of at least 3 thousand hours. Full realization of the advantages of automated fine cleaning of engine oil by combining filtration and centrifugation, are applicable for marine diesel engines of medium and high speed with a capacity of up to 20 thousand kW. Keywords: resource-saving oil use, self-regenerating filter, centrifugal separator, diesel wear, combined oil purification, lubrication system, separator performance index, optimization of oil separation

scholarly journals SYSTEMS OF MONITORING MARINE DIESEL ENGINES IN OPERATION

2018 ◽  
pp. 87-92 ◽  
Author(s):  
Alexey Valerievich Soloviev
Keyword(s):  
Diesel Engines ◽  
High Speed ◽  
Monitoring Systems ◽  
Technical Diagnostics ◽  
Diagnostic Systems ◽  
Technical Parameters ◽  
Advantages And Disadvantages ◽  
Marine Engines ◽  
Marine Diesel ◽  
Processing Information

The article provides an overview of currently used diagnostic systems of medium- and high-speed marine diesel engines. The parameters controlled by diagnostic systems have been discussed. The advantages and disadvantages of the monitoring systems of marine diesel engines designed as a single software-hardware complex have been analyzed. As it has been stated, universal monitoring systems for engines of different models are not created. Specialized diagnostic systems are only installed in powerful engines which are used on sea-going ships, not on river vessels and mixed (river-sea) navigation vessels; such complexes have not been applied so far. According to the results of the analysis, there have been listed engine diagnostic parameters required for implementing algorithms of automatic diagnostics without disassembling. The paper presents a review of commercially available sensors for measuring parameters of engines in operation. It has been shown that currently the decision of tasks of technical diagnostics of marine engines and, therefore, other less complex mechanisms of a ship power plant on the river vessels is possible because of modern electronic control systems that allow continuous monitoring of technical parameters, i.e. collecting and processing information received from sensors of the controlled variables and processes.

scholarly journals DIAGNOSIS OF INJECTORS OF HIGH-SPEED MARINE DIESEL ENGINES

2017 ◽  
pp. 50-58
Author(s):  
Konstantin Olegovich Sergeev ◽  
Andrew Adol'fovich Pankratov
Keyword(s):  
Vibration Control ◽  
Diesel Engines ◽  
High Speed ◽  
Vibration Signal ◽  
Technical Condition ◽  
Center Frequency ◽  
High Speed Diesel ◽  
Marine Diesel

The method of determining the technical condition of the injector of high-speed diesel using the method of vibration control on the injector body is considered. Vibration signal is measured by the accelerometer and is filtered by 1/3 - octave filter with a center frequency of 63 kHz. The measurements were performed at idle, 20%, 33%, 66% and 100% of rated power, as well as on the nominal power with an artificially introduced defect of the injector - spring breakage. The temporal realization of the signal is used for diagnosis. The conclusions about the nature of the change in the temporal realization of vibration signal depending on the power state and the presence of faults have been made. The possibility of determining of the cyclic supply and cylinder output using the vibration signal was estimated. The direction of further research to improve the accuracy of diagnosis has been proposed.

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