, 2017) Simulation model of an ORC to recover waste heat from the exhaust gas of marine engines. EGR is a NO x -emissions-reduction technique that ensures IMO Tier III-compliance in both diesel and gas mode. Apr 29, 2023 · The reformed exhaust gas recirculation system is adopted in another marine natural gas engine together with hydrogen enrichment (Li et al. , idling or at speed or under load), and whether the engine is in an on-road vehicle, farm vehicle, locomotive May 1, 2021 · The brake specific NO x emission from the SI marine LNG engine with reformed exhaust gas recirculation (REGR) is reduced by 60–70% at REGR rate . 6, the specific fuel consumption without exhaust gas recirculation (EGR) system is 165–167 g/ (kWh) (Fig. 960 - 986 Jun 17, 2014 · In exhaust gas recirculation, some of the exhaust gas is drawn off from the exhaust system, cooled and redirected back into the cylinders (see Figure 2). The back pressure in the exhaust gas system at specified Maximum Continuous Rating (MCR) of engine depends on the gas velocity, and it is inversely proportional to the pipe diameter to the 4th power. Exhaust gas recirculation (EGR) is introduced to these engines to reduce the produced combustion NO x to the allowed levels. (2022) [46] conducted a parametric investigation into a marine diesel engine with a recirculation exhaust gas and turbocharger system. Such challenges become more pronounced in complex engine configurations that include parallel Feb 27, 2022 · Two-stroke marine diesel engines are widely used in the ships all over the world because of their high efficiency and reliability. Together with the proposed system with the specified air–fuel ratios, the elevated rates of reformate exhaust gases the flame development, combustion duration, and the efficiency of the combustion . At the same time, operators save on fuel costs with an SCR system, because internal engine parameters can be configured for ultra-low fuel consumption. 120114 Corpus ID: 233566459; Application of reformed exhaust gas recirculation on marine LNG engines for NO emission control @article{Yanxiang2021ApplicationOR, title={Application of reformed exhaust gas recirculation on marine LNG engines for NO emission control}, author={Long Yanxiang and Gesheng Li and Zunhua Zhang and Junjie Liang}, journal={Fuel}, year={2021 May 13, 2011 · A mean-value model of a diesel engine with a variable-geometry turbocharger (VGT) and exhaust gas recirculation (EGR) is developed, parameterized, and validated. CRediT authorship contribution statement. These technologies allow increasing fuel economy by cooling the cyclic air in waste heat using chillers (WHUCh) [6, 7]. Jul 27, 2017 · For low-speed two-stroke marine diesel engines, HFO is the first fuel option. Jan 1, 2013 · This paper investigates control possibilities for Exhaust Gas Recirculation (EGR) on large diesel engines. 5% of sulphur has to be used to reduce emissions. The intended model applications are system analysis, simulation, and development of model-based control systems. Since the exhaust gas from the gas engine includes slipped Dec 1, 2013 · This paper introduces the impact on the marine environment caused by marine diesel engine exhaust pollution and the regulations made by IMO to control the marine diesel engine emissions. The exhaust gas recirculation function happens by diverting a portion of exhaust gasses back into the engine’s combustion chamber where they mix with the incoming air-fuel mixture. However, the fuel economy of the diesel engine is poor due to the poor burning efficiency in the cylinder and Sep 1, 2022 · Exhaust Gas Recirculation (EGR) system is a commonly used pretreatment technique to improve pollutant emissions from modern diesel engines. This is the widely used process to reduce and control the oxides of Dec 29, 2023 · Exhaust gas recirculation (EGR) and two-stage turbocharging technology are widely used in marine diesel engines due to their advantages of reducing nitrogen oxides (NO x) emission and improving fuel economy respectively. However, the fuel economy of the diesel engine is poor due to the poor burning efficiency in the cylinder and Large marine two-stroke diesel engines are widely used as propulsion systems for shipping worldwide and are facing stricter NO xemission limits. Albeit the exhaust gas recirculation (EGR) is widely used to reduce the nitrogen oxides (NOx) emissions from large marine two-stroke engines, several challenges emerge for the engine-turbocharging system matching considering the contradictory requirements of the engine and its subsystems operation. Mar 1, 2019 · In an effort to highlight the exhaust gas recirculation (EGR) system, [43] conducted a research on the methods of its use in the reduction of the NOX emission in low-speed ship diesel engines and On diesel engines in particular, series production in both passenger and commercial vehicle sectors has long incorporated systems which introduce cooled exhaust gas into the charge air in order to lower peak combustion temperatures and thus significantly reduce NOx emissions. Jun 29, 2022 · Exhaust Gas Recirculation (EGR) is a critical emission control technology used in diesel engines to reduce the formation of nitrogen oxides (NOx) by lowering the combustion temperature. The Exhaust gas recirculation system has the ability to protect the environment and human life from the engines ‘ harmful gases. However, as NO x reduces, particulate matter (PM) increases, resulting from the lowered oxygen concentration. The investigation of the EGR system in marine engines has recently attracted Jan 30, 2020 · ABSTRACT. 1016/J. The effects of the IEGR strategy on the fuel/air mixture quality, combustion performance, and emission Dec 15, 2012 · Abstract. FUEL. 5), the amount of nitrogen oxides in the exhaust gases is high. The exhaust gas is hotter than the fresh air sucked by the engine. Yanxiang Long: Conceptualization, Methodology, Investigation, Writing - original draft. The application of the EGR system of the ship’s diesel engine using the heat of the gases by the ejector and absorption chillers for cooling the engine inlet air is proposed to cool the air entering the 6G50ME-C9. The value of 90% should be read as the throttle being Exhaust Gas Recirculation (EGR) complete guide – components. [102] proposed a study about a dual loop ORC system with the aim of recovering waste heat in parallel from the exhaust gas of marine Diesel engines, with the highlighted benefit of being more versatile when operating at off-design conditions. The exhaust gas leaves the engine first and then circulates into the engine. The external EGR serves to introduce part of the exhaust gas into the intake system through the external pipeline. And it summarizes the main technical measures to reduce SOx, NOx and particulate matter emissions from the marine diesel. Jan 1, 2003 · This work studies the complex interactions resulting from the application and control of Exhaust Gas Recirculation (EGR) on a production heavy-duty diesel engine system, and its effectiveness in IDE07778 – exhaust gas flap 1 regulating unit, row 1, feedback on position – actual value (this parameter provides information on the exhaust gas throttle position in the exhaust system for low-pressure recirculation: increased exhaust gas output is caused by a closed exhaust gas flap. Apr 4, 2018 · The Exhaust Gas Recirculation system recirculates a part of the exhaust gas back into the engine cylinders through the combustion chamber. The control design is based on a control oriented model of the nonlinear dynamics at hand that incorporates fuel flow and turbocharger speed changes as known disturbances to the exhaust gas recirculation. When measured in the exhaust duct of a marine diesel engine nitrogen oxide or NOx emissions comprise about 95% nitric oxide (NO) and 5% nitrogen dioxide (NO 2 ), which is formed as NO oxidises after the engine. The logic behind the EGR system is very simple. Rankine; EGR: Medium + Low: 2017 (Mondejar et al. Aug 1, 2017 · A simplified overview of the airflow of a large two-. The improvement in marine diesel engine efficiency is shown in Figure 1, which shows the SFOC for two stroke engines based on data for MAN Diesel and Turbo engines since 1912 to 2012. It also points that the combination application of various technologies will be the Jun 1, 2017 · A diesel engine system model with MC-EGR-VNT (MEV) technology was developed using GT-Power based on the data of the engine bench to analyze the effects of the Miller cycle (MC), exhaust gas May 1, 2002 · Exhaust gas recirculation in diesel engines. Although the exhaust fills the combustion chamber, it is not involved in the combustion reaction that takes place in the cylinder due to its low oxygen content. Nov 1, 2012 · For centralized exhaust gas recirculation systems, EGR valve is far away from inlet valves, normally at the entrance to intake manifold, where collector provides a good mixture of exhaust gas and fresh air and thus optimal distribution to each cylinder. SFC with gas recirculation system on the route is 168–170 g/ (kWh). Aug 24, 2022 · To meet increasingly stringent emission standards and lower the brake-specific fuel consumption (BSFC) of marine engines, a collaborative optimization study of exhaust gas recirculation (EGR) and a Miller cycle coupled turbocharging system was carried out. In this case, the recirculation coefficient is Kr = 13–15%. Apr 22, 2021 · The most important thing to consider while designing the exhaust piping system is the back pressure on the turbocharger. Mar 1, 2019 · The study objective is to identify to what extent the recirculation of exhaust gas from a low-speed marine diesel engine affects environmental, economic and power-related parameters in engine operation. Based on a fully engine-integrated EGR system, low speed marine engine builder Mitsui and MAN have tested and confirmed EGR’s viability as a route for compliance with the stringent limitations on NO x imposed by IMO Tier III for ships in Emission Control Areas. [25] experimentally investigated the operation of a single cylinder engine with HP-EGR Jan 5, 2022 · Lu et al. Exhaust Gas Recirculation (EGR) is a system that allows the May 1, 2021 · DOI: 10. (on the left) exhaust gas Oct 10, 2017 · The authors have proposed a combined exhaust gas recirculation (C-EGR) system to reduce the slipped methane from the gas engines and NO x from marine diesel engines by providing the exhaust gas from lean burn gas engine to the intake manifold of the marine diesel engine using a blower. Hence, this study aimed to optimise the settings of a marine four-stroke dual fuel (DF The efficiency of diesel engines has constantly increased since the first maritime diesel engine was introduced on an ocean-going merchant ship, the SELANDIA in 1912. Compliance with extremely low emission limits, however, requires a combination of internal engine optimization using exhaust gas recirculation and external 2018 GUIDELINES FOR THE DISCHARGE OF EXHAUST GAS RECIRCULATION (EGR) BLEED-OFF WATER 1 INTRODUCTION 1. Exhaust gas recirculation (EGR) is effective to reduce nitrogen oxides (NO x) from Diesel engines because it lowers the flame temperature and the oxygen concentration of the working fluid in the combustion chamber. 2020. Aug 31, 2023 · Combined selective catalytic reduction technology and dry exhaust gas cleaning technology, a test rig (SCR-DryEGCS system) for WD10C195-15 marine four-stroke high speed diesel engine was established to analyse the removal effect of NOx, SO 2, and PM from exhaust gas. Recently, the EGR cooling strategy focuses on improving combustion stability, NO x emission and fuel consumption values by controlling oxygen dilution, in-cylinder and exhaust gas temperatures. This paper introduces the details of the proposed C-EGR system and presents the exptl. Jun 22, 2022 · Since the exhaust gas from the gas engine includes slipped methane, this system could reduce both the NOx from the marine diesel engine and the slipped methane from the lean burn gas engine simultaneously. 1. When an exhaust gas recirculation (hereafter EGR) system is applied for the exhaust gas reduction, not only is the fuel consumption increased according to the amount of EGR, but the vibration excitation force tends to increase as well. The investigation of the EGR system in marine engines has Description. Exhaust Gas Recirculation (EGR) system is adopted by the main engine manufactory for the purpose of decreasing the NOx emission in marine diesel engines. Jul 30, 2017 · The paper presents the results of evaluating the effect of exhaust gas recirculation on the economic, energy, and environmental criteria of marine diesel engine 6CHHSP 18/22-600 through a work gas recirculation (EGR) is currently being introduced in marine diesel engines to reduce nitric oxide (NO x) emissions. Jun 17, 2014 · In exhaust gas recirculation, some of the exhaust gas is drawn off from the exhaust system, cooled and redirected back into the cylinders (see Figure 2). However, the application of EGR also incurs penalties. A circuit design solution was proposed using the heat of recirculation gas (RG) by an ejector chiller (ECh) and Nov 1, 2020 · The application of multiple injection in marine diesel engines differs from its use in vehicles or heavy-duty engines, as it is not commonly combined with Exhaust Gas Recirculation (EGR). Apr 12, 2014 · Exhaust gas recirculation is a well established method of NO x reduction on high speed diesel engines in all fields of application. 4 ). The following article uses two modified MTU Friedrichshafen GmbH diesel engines to illustrate how this exhaust gas Lean mixtures (excess air, λ = 1. Mar 2, 2022 · Although the exhaust gas recirculation (EGR) technology has been proven effective to decrease the marine engine’s nitrogen oxides (NOx) emissions, it is associated with a considerable fuel Large two-stroke marine diesel engines cannot meet the strict Tier III NO x emission limits, imposed by the IMO, with in-engine modifications. Control limitations imposed by the system are assessed using linear analysis of the highly non-linear dynamics. Jun 5, 2019 · Owing to increasingly strict emission regulation, almost all marine diesel engines are equipped with exhaust gas recirculation (EGR) to reduce NO X pollutant emissions effectively [1,2]. They expressed the major role of the recirculation Sep 5, 2019 · This helps to reduce Nox emissions from the main engine. 8 83 – 900 Nov 1, 2021 · The impact of exhaust gas recirculation (EGR) on combustion and emissions in direct injection (DI) diesel engine is examined in a predominately computational study, where the influence of EGR rate Optimization and 4E analysis of integration of waste heat recovery and exhaust gas recirculation for a marine diesel engine to reduce NOx emissions and improve efficiency Author links open overlay panel Yongming Feng a , Zhiqiang Du b , Jinbo Qu a , Yuanqing Zhu a , Shuaichao Zheng a 1. EGR is one of the most effective techniques currently available for reducing NO X emissions in internal combustion engines. May 11, 2018 · Albeit the exhaust gas recirculation (EGR) is widely used to reduce the nitrogen oxides (NOx) emissions from large marine two-stroke engines, several challenges emerge for the engine Sep 2, 2020 · When converting diesel engine 4F 11. Exhaust Gas Recirculation on Marine Engines The investigation and implementation of the EGR technology in diesel engines, either alone or combined with other technologies, has mainly been studied for various applications of the automotive and rail industry [5–14]. The conclusion is that the dual-loop ORC has a power output that is between 3 and 15% higher Diesel exhaust is the gaseous exhaust produced by a diesel type of internal combustion engine, plus any contained particulates. 1 Regulation 13. Apr 1, 2022 · To meet the stringent emissions legislation and higher fuel economy requirements of the low-speed two-stroke marine diesel engine, a new method named Injected Exhaust Gas Recirculation (IEGR) strategy was proposed in this paper. Apr 1, 2004 · Abstract. Gesheng Li: Writing - review & editing, Supervision, Data curation. The formation rate of the majority of nitric oxide is dependent on peak Aug 1, 2019 · For this purpose, the vessel should apply additional nitrogen-oxide reduction facilities. In such systems a part of the exhaust gas is recirculated into the engine. Diesel & T urb o is shown in Figure 1. 5 installed on trucks and tractors of urban public utilities to NG, and while the simultaneous use of exhaust gas recirculation (EGR) in it at a rate of 20% Jun 17, 2020 · Dual fuel engines constitute a viable solution for enhancing the environmental sustainability of the shipping operations. There have also been many studies on using EGR in ships. The EGR system returns the engine exhaust gases back to the engine cylinder. Ludu et al. Apr 1, 2022 · To reach this target, the Injected Exhaust Gas Recirculation (IEGR) strategy was proposed. Jun 6, 2024 · The exhaust gas recirculation system is a technology employed in internal combustion engines to reduce harmful emissions. Depending on whether the exhaust gas is recirculated Feb 27, 2022 · Two-stroke marine diesel engines are widely used in the ships all over the world because of their high efficiency and reliability. During this process, it reduces the temperature of the exhaust gases and the oxygen level in the cylinder of the engine. In this video, we show you how EGR operates, the components it Parametric investigation of a large marine two-stroke diesel engine equipped with exhaust gas recirculation and turbocharger cut out systems Daoyi Lua,b,1, Gerasimos Theotokatosb,*, 1, Jundong Zhanga, Hong Zenga and Keying Cuic a Marine Engineering College, Dalian Maritime University, Dalian 116026, China Jun 17, 2014 · In exhaust gas recirculation, some of the exhaust gas is drawn off from the exhaust system, cooled and redirected back into the cylinders (see Figure 2). The matching of EGR, two-stage turbocharging and diesel engine is significant to realize both advantages simultaneously. During the voyage of the vessel for the main engine 6G50ME-C9. stroke engine with high-pressure EGR developed by MAN. Apr 1, 2004 · Dilution of combustion by EGR (Exhaust Gas Recirculation) gases is considered an effective technique to reduce pollutant emissions, especially NOx. 6 marine engine. In the case of Diesel engines, they include worsening specific fuel consumption and particulate emissions [4], [5]. NOX emissions. It works at the level of the boost pressure generated by the turbocharger and is therefore referred to as high-pressure exhaust gas recirculation. results of emissions characteristics on the C-EGR system. 2. Nov 24, 2020 · MAN Energy Solutions has announced that it is to offer its proprietary EGR (Exhaust Gas Recirculation) system as an emissions solution for its new, low-speed ME-GA engine, the Otto-cycle variant of its established ME-GI dual-fuel engine. 0/2. So, the exhaust gas significantly reduces the contents of the cylinder for combustion. Exhaust Gas Recirculation (EGR)systems are widely used in diesel engines with the purpose of reducing the formation of nitrogen oxides (NOx), by lowering the combustion temperature and the amount of oxygen into the cylinders. ORC Dec 1, 2023 · Reducing the combustion temperature is an important in-cylinder measure to decrease NOx emissions of marine diesel engines. The greening of diesel engines of marine power plants through the recirculation of exhaust gases in EGR systems with their resupply to the engine cylinders leads to the significant reduction in fuel economy, which is due May 27, 2015 · Dual-loop exhaust gas recirculation (EGR) with variable geometry turbocharger (VGT) is an effective technique to simultaneously control intake manifold conditions (pressure, temperature, and burned gas mass fraction) in Diesel engines. Exhaust Gas Recirculation (EGR) is an emission control strategy that offers significant reduction in NOX emissions from internal combustion engines. Exhaust emissions from marine diesel engines comprise nitrogen, oxygen, carbon dioxide (CO2), carbon monoxide (CO), oxides of sulphur (SOx), nitrogen oxides (NOx), hydrocarbons, water vapour and smoke. Jan 1, 2022 · @article{Lu2022ParametricIO, title={Parametric investigation of a large marine two-stroke diesel engine equipped with exhaust gas recirculation and turbocharger cut out systems}, author={Daoyi Lu and Gerasimos Theotokatos and Jun-dong Zhang and Hong Zeng and Keying Cui}, journal={Applied Thermal Engineering}, year={2022}, url={https://api Apr 15, 2022 · Reformed exhaust gas recirculation technology has attracted great attention in internal combustion engines. diesel engines. The focus of EGR technology is to overcome the ‘exhaust gas backflow problem’ and control the EGR rate rationally. 5. According to MARPOL regulations, from 1st January 2020, fuel with less than 0. Feb 21, 2022 · During the usage of the EGR system, some of the exhaust gases (10–40%) go into the scrubber recycling system (SRS). In diesel engines, which always run on lean mixtures (λ = 1. There is thus increasing interest in removing the particles that are introduced into the engine with the recirculated exhaust gas. About 75% of all marine diesel engines are four-stroke engines; however, 75% of the installed power is produced by two-stroke engines. This comprehensive guide delves into the technical specifications, components, and maintenance of diesel engine EGR systems, providing a valuable resource for Jan 1, 2013 · A nonlinear adaptive controller is proposed for the exhaust gas recirculation system on large two-stroke diesel engines. Concentration of nitrogen oxides in exhaust gases was assumed to be the environmental parameter of an engine, specific fuel consumption as its economic parameter while effective (brake) power Exhaust gas recirculation (EGR) systems have been introduced in order to comply to the new standards. Its composition may vary with the fuel type or rate of consumption, or speed of engine operation (e. New Technologies for Emission Control in Marine Diesel Engines provides a unique overview on marine diesel engines and aftertreatment technologies that is based on the authors’ extensive experience in research and development of emission control systems, especially plasma aftertreatment systems. In this study, a one-dimensional numerical model of the EGR, Miller cycle, and adjustable two-stage turbocharged engine based on WeiChai Dec 1, 2023 · Study of steam Rankine cycles for WHR from the exhaust gas of a marine engine combined with an exhaust gas recirculation system. 5 of MARPOL Annex VI requires marine diesel engines to meet the Tier III NO X emission levels when operating in a NO X Tier III emission control area in accordance with the provisions in regulations 13. EGR was applied in light-duty gasoline and diesel-fueled vehicles in the mid-1970s and has transferred over to heavy-duty diesel engines from the early 2000s. Marine diesel engines are very similar to the self-ignition engines in heavy-duty vehicles, but they are generally larger, more complex, and operate with higher efficiency. exhaust gas recirculation (EGR) system was used in this study, as shown in Figure 1. Selective catalytic reduction (SCR) and exhaust gas recirculation (EGR) are highly effective technologies to minimize harmful NOx emissions. Exhaust Gas Recirculation (EGR) was recently introduced in large marine two-stroke diesel engines to reduce NO x-emissions. To avert this erosion, an exhaust gas cleaning system is in application. This study aims to parametrically optimise the EGR and turbocharging system settings of a large marine two-stroke engine with the Oct 17, 2015 · EFFECT OF EGR NOx EMISSINON IN CONSTANT SPEED DIESEL ENGINE Exhaust gas recirculation (EGR) is a pre-treatment technique. Traditional fixed-gain feedback methods are not able to control the EGR system adequately in engine loading transients so alternative methods are needed. Exhaust gas recirculation (EGR) is widely used to reduce the NOx emissions of diesel and commercial vehicles [17,18]. To address the control problem for this highly coupled and complicatedly dynamic multi-input multi-output (MIMO) system, this paper proposed a control method Mar 1, 2020 · Yun et al. Jan 1, 2016 · [2] Zheng, M. Oxides of nitrogen and sulphur are of special concern as threats to vegetation, the environment and human health. To verify the effect of the IEGR strategy on a two-stroke marine diesel engine, a three-dimensional numerical simulation model was built, then the influence of the IEGR strategy on combustion performance and emission characteristics was studied. 1) cause more nitrogen oxides (NOx). The EGR rate is controlled by adjusting the opening of the EGR valve to Oct 28, 2020 · Panomsuwan et al. Mar 2, 2022 · Although the exhaust gas recirculation (EGR) technology has been proven effective to decrease the marine engine’s nitrogen oxides (NOx) emissions, it is associated with a considerable fuel consumption increase and challenges to the engine–turbocharger matching. Also using cleaner fuels like ultra-low sulphur fuel oil, marine gas oil, marine diesel oil help in reducing exhaust gas emissions drastically. May 16, 2022 · The main gaseous constituents of exhaust gases generated by marine diesel engines are carbon dioxide (CO 2), water vapor (H 2 O), nitrogen (N 2) and oxygen (O 2) []. reduced pollutant emissions by applying non-thermal plasma technology to a marine diesel engine. During accelerations, controlling the amount of EGR flow while still We offer proven exhaust gas after treatment systems that meet the International Maritime Organization’s strict regulations for NOx emissions and fuel sulfur content, even in Emission Control Areas (ECA). Jun 25, 2017 · The paper presents the results of evaluating the effect of exhaust gas recirculation on the economic, energy, and environmental criteria of marine diesel engine 6CHHSP 18/22-600 through a work The EGR system’s e ects on the marine four-stroke diesel engines were investigated in [25–35]. Sep 24, 2020 · Hence, this study aimed to optimise the settings of a marine four-stroke dual fuel (DF) engine equipped with exhaust gas recirculation (EGR) and air bypass (ABP) systems by employing simulation Mar 16, 2020 · Exhaust gas recirculation is used to reduce harmful emissions from petrol and diesel engines. Such technique is commonly used in internal The exhaust gas recirculation system widely used today draws off part of the exhaust flow upstream of the turbocharger turbine and feeds it back into the air intake system downstream of the compressor. The goal is to reduce the amount of NO x in the exhaust gas by reducing the oxygen concentration available for combustion. Since the current number of engines built with EGR is low and NOx Reduction by Exhaust Gas Recirculation – MAN explains. The decentralized EGR system directly supplies exhaust gas to inlet valves. In the EGR string. A platform of an exhaust gas-fuel reformer connected with the marine LNG engine was set up for generating on-board hydrogen. Aug 1, 2017 · Modelling diesel engines with a variable-geometry turbocharger and exhaust gas recirculation by optimization of model parameters for capturing non-linear system dynamics Proceedings of the Institution of Mechanical Engineers, Part D, Journal of Automobile Engineering , 225 ( 7 ) ( 2011 ) , pp. 1 and 13. The speed of the combustion. , et al, Diesel engine exhaust gas recirculation- a review on advanced and novel concept, Energy Conversion and Management, 45 (2004), pp. g. Data logged on board a cruise ship with four-stroke engines. Feb 1, 2017 · Exhaust Gas Recirculation (EGR) has recently been introduced in large marine two-stroke diesel engines to reduce NOx emissions. Miller-cycle and Exhaust Gas Recirculation (EGR) are effective methods Nov 18, 2021 · It is justified to use the technologies of the utilization of recirculation exhaust gas heat for cooling engine intake air to improve the environmental and fuel efficiency of the marine diesel engine using EGR systems . 2019). However HFO contains high concentration of sulphur, and there are sulfur oxides in the recirculated exhaust gas, leading to the erosion of components of engine. As known, in-cylinder available nitrogen and oxygen react at high temperatures in the reaction zone of combustion flame, generating nitrogen oxides (NO x) which are primarily a mixture of nitrogen monoxide (NO) and nitrogen dioxide Albeit the exhaust gas recirculation (EGR) is widely used to reduce the nitrogen oxides (NOx) emissions from large marine two-stroke engines, several challenges emerge for the engine−turbocharging system matching considering the contradictory requirements of the engine and its subsystems operation. May 29, 2021 · Full size image. Controlling EGR flow during accelerations, while keeping good acceleration performance is challenging, due to delays in the scavenge receiver oxygen measurement and upper limits on fuel for avoiding black smoke. Although these engines comply with the Tier III NOx emissions regulations when operating at the gas mode, additional measures are required to ensure such compliance at the diesel mode. A possible solution that has been tested over the last years, in order to comply with the new regulations, is to implement an Exhaust Gas Recirculation (EGR) system. im qy jj ok tg en qf fc jy yq