Investigation of EGR With EGB (Exhaust Gas Bypass) on Low Speed Marine Diesel Engine Performance and Emission Characteristics

Wang, Zhanguang; Zhou, Song; Feng, Yongming

doi:10.1115/omae2017-62606

Cited by 4 publications

(3 citation statements)

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“…Exhaust gas recirculation (EGR) is a method to reduce the formation of NOx in marine diesel engines significantly. In the EGR system, after a cooling and cleaning process, part of the exhaust gas is recirculated to the scavenge air receiver [33]. In this way, part of the oxygen in the scavenge air is replaced by CO 2 from the combustion process.…”

Section: Treatment Solutionsmentioning

confidence: 99%

Technological Perspective for Reducing Emissions from Marine Engines

Hoang

Pham

2019

Int. J. Adv. Sci. Eng. Inf. Technol.

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Climate change and adverse impacts on the ocean environment have recently received much attention in the shipping and marine economic sectors. Preventing pollution of the marine environment from land sources through the river or atmospheric water is only possible by applying clean industrial technologies without waste and methods for rational use of natural resources. Main technical facilities to protect the sea environment from the current pollution are used to remove toxic substances from waste sources of ships. The International Maritime Organization increasingly tightens regulations on emissions with marine transport fleets, especially emissions of NOx and SOx. Therefore, many countries in the world continually improve and develop marine diesel engines in the direction of reducing emissions with different technologies. It is a tremendous necessary to enrich the technological knowledge to select new energy equipment in shipbuilding because they play a vital role in ensuring emission standards throughout the life of the ship. Indeed, technology development orientation in coastal countries' marine industry with the initial study results on the use of extraction optimization measures, alternative fuels, and output emission control solutions, it shows that we can implement some technologies to achieve NOx and SOx reduction according to IMO regulations. This paper summarizes the most important recent development technologies in the world in the field of marine engines. Also, the authors assessed the possibility of applying these new technologies to fleets of coastal countries to meet environmental requirements.

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Section: Treatment Solutionsmentioning

confidence: 99%

Technological Perspective for Reducing Emissions from Marine Engines

Hoang

Pham

2019

Int. J. Adv. Sci. Eng. Inf. Technol.

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“…In this latter publication, the modeling approach is tested for two different engines, the 4T50ME-X test engine and a 6S80ME-C9.2 engine installed in a container ship. In Wang et al, 23,24 the commercial software GT-Power is used to develop one-dimensional models of two-stroke engines with EGR. The effects of exhaust gas bypass (EGB) and cylinder bypass (CB) on EGR operation are investigated using the developed model.…”

Section: Related Researchmentioning

confidence: 99%

Control-oriented modeling of two-stroke diesel engines with exhaust gas recirculation for marine applications

Llamas

Eriksson

2018

Proceedings of the Institution of Mechanical Engineers, Part M:

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Large marine two-stroke diesel engines are widely used as propulsion systems for shipping worldwide and are facing stricter N O x emission limits. Exhaust gas recirculation (EGR) is introduced to these engines to reduce the produced combustion N O x to the allowed levels. Since the current number of engines built with EGR is low and engine testing is very expensive, a powerful alternative for developing EGR controllers for such engines is to use control-oriented simulation models. Unfortunately, the same reasons that motivate the use of simulation models also hinder the capacity to obtain sufficient measurement data at different operating points for developing the models. A Mean Value Engine Model (MVEM) of a large two-stroke diesel with EGR that can be simulated faster than real time is presented and validated. An analytic model for the cylinder pressure that captures the effects of changes in the fuel control inputs is also developed and validated with cylinder pressure measurements. A parameterization procedure that deals with the low number of measurement data available is proposed. After the parameterization, the model is shown to capture the stationary operation of the real engine well. The transient prediction capability of the model is also considered satisfactory which is important if the model is to be used for EGR controller development during transients. Furthermore, the experience gathered while developing the model about essential signals to be measured is summarized, which can be very helpful for future applications of the model. Finally, models for the ship propeller and resistance are also investigated, showing good agreement with the measured ship sailing signals during maneuvers. These models give a complete vessel model and make it possible to simulate various maneuvering scenarios, giving different loading profiles that can be used to investigate the performance of EGR and other controllers during transients.

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“…Moreover, in the same publication, several simplifications are done to the original MVEM to obtain a dynamically simplified model that is shown to capture the oxygen dynamics well. More recently, a one-dimensional model of a two-stroke EGR engine implemented in the commercial software GT-power was used to investigate EGR operation with exhaust gas bypass (EGB), and cylinder bypass (CB), see Wang et al [91,92]. Furthermore, a waste heat recovery system to extract energy from the hot EGR gas is modeled and optimized in Kyriakidis et al [93].…”

Section: The Exhaust Gas Recirculation Systemmentioning

confidence: 99%

Modeling and Control of EGR on Marine Two-Stroke Diesel Engines

Llamas¹

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The cover: The photo in the background shows several merchant ships arriving and leaving the Port of Barcelona. Several pictures were used to create the cover photo. All these images were taken by the author of the dissertation on board of a plane, seconds before landing at Barcelona Airport in May 2016. The author would like to thank Albert Escànez for doing an excellent job editing the images and designing the cover. Typeset with L A T E X 2εPrinted by LiU-Tryck, Linköping, Sweden 2018 i AbstractThe international marine shipping industry is responsible for the transport of around 90% of the total world trade. Low-speed two-stroke diesel engines usually propel the largest trading ships. This engine type choice is mainly motivated by its high fuel efficiency and the capacity to burn cheap low-quality fuels. To reduce the marine freight impact on the environment, the International Maritime Organization (IMO) has introduced stricter limits on the engine pollutant emissions. One of these new restrictions, named Tier III, sets the maximum NO x emissions permitted. New emission reduction technologies have to be developed to fulfill the Tier III limits on two-stroke engines since adjusting the engine combustion alone is not sufficient. There are several promising technologies to achieve the required NO x reductions, Exhaust Gas Recirculation (EGR) is one of them. For automotive applications, EGR is a mature technology, and many of the research findings can be used directly in marine applications. However, there are some differences in marine two-stroke engines, which require further development to apply and control EGR.The number of available engines for testing EGR controllers on ships and test beds is low due to the recent introduction of EGR. Hence, engine simulation models are a good alternative for developing controllers, and many different engine loading scenarios can be simulated without the high costs of running real engine tests. The primary focus of this thesis is the development and validation of models for two-stroke marine engines with EGR. The modeling follows a Mean Value Engine Model (MVEM) approach, which has a low computational complexity and permits faster than real-time simulations suitable for controller testing. A parameterization process that deals with the low measurement data availability, compared to the available data on automotive engines, is also investigated and described. As a result, the proposed model is parameterized to two different two-stroke engines showing a good agreement with the measurements in both stationary and dynamic conditions. Several engine components have been developed. One of these is a new analytic in-cylinder pressure model that captures the influence of the injection and exhaust valve timings without increasing the simulation time. A new compressor model that can extrapolate to low speeds and pressure ratios in a physically sound way is also described. This compressor model is a requirement to be able to simulate low engine loads. Moreover, a novel parameteriza...

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Investigation of EGR With EGB (Exhaust Gas Bypass) on Low Speed Marine Diesel Engine Performance and Emission Characteristics

Cited by 4 publications

References 0 publications

Technological Perspective for Reducing Emissions from Marine Engines

Technological Perspective for Reducing Emissions from Marine Engines

Control-oriented modeling of two-stroke diesel engines with exhaust gas recirculation for marine applications

Modeling and Control of EGR on Marine Two-Stroke Diesel Engines

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