Performance and emission characteristics of additives-enhanced heavy fuel oil in large two-stroke marine diesel engine

Ryu, Younghyun; Lee, Youngseo; Nam, Jeong-Gil

doi:10.1016/j.fuel.2016.06.029

Cited by 48 publications

(22 citation statements)

References 17 publications

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“…Taking into account the entire world fleet, ship propulsion plants are today mainly based on diesel engines, regardless of its type and operation characteristics. Slow-speed two-stroke diesel engines are often used as main propulsion components [1], [2], while medium-speed or fast-speed four-stroke diesel engines in marine propulsion plants can be used in various combinations and variations [3].…”

Section: Introduction / Uvodmentioning

confidence: 99%

Energy Analysis of Main Propulsion Steam Turbine from Conventional LNG Carrier at Three Different Loads

Mrzljak

Poljak

2019

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This paper presents energy analysis of entire marine main propulsion steam turbine and both of its cylinders at three different loads. Marine steam propulsion plant in which main turbine operates is described in detail. Measured data from real exploitation at each required turbine operating point enables calculation of energy losses and efficiencies. Real developed power distribution between both turbine cylinders is not the same at all observed loads. Energy losses and efficiencies of main turbine cylinders and entire main steam turbine increases during the increase in turbine load. An increase in turbine load resulted with in a sharp increase in energy efficiency of HPC (High Pressure Cylinder) from 51.01 % to 74.13 %, while the increase in energy efficiency of LPC (Low Pressure Cylinder) is not as sharp (from 73.88 % to 78.50 %). The change in energy efficiency of the entire main steam turbine during the load increase (from 65.54 % to 79.45 %) is mostly influenced by a change in energy efficiency of HPC. Energy loss and real developed power ratio is reversely proportional to energy efficiencies and losses of both steam turbine cylinders and the entire turbine. Sažetak Ovaj članak prikazuje energijsku analizu čitave glavne propulzijske parne turbine i oba njezina kućišta pri trima različitim opterećenjima. Opisuje se podrobno, brodsko parno propulzijsko postrojenje u kojemu radi glavna turbina. Izmjereni podatci stvarne eksploatacije za svaku zahtijevanu radnu točka turbine omogućavaju izračun energijskih gubitaka i učinkovitosti. Stvaran raspored distribucije snage između oba kućišta turbine nije isti na svim promatranim opterećenjima. Energijski gubici i učinkovitosti turbinskih kućišta i cijele glavne turbine, povećavaju se za vrijeme porasta opterećenja turbine. Povećanje opterećenja turbine rezultira naglim rastom energijske učinkovitosti HPC (High Pressure Cylinder = kućište visokoga tlaka) od 51.01 % do 74.13 % dok povećanje energijske učinkovitosti LPC (Low Pressure Cylinder = kućište niskoga tlaka) nije tako naglo (od 73.88 % do 78.50 %). Promjena energijske učinkovitosti cijele glavne parne turbine, za vrijeme povećanja opterećenja (od 65.54 % do 79.45 %), najviše je pod utjecajem promjene energijske učinkovitosti HPC. Gubitak energije i stvarni omjer razvijene snage obrnuto je proporcionalan energijskim učinkovitostima i gubicima za oba kućišta i cijelu parnu turbinu. KEY WORDS main marine steam turbine marine propulsion plant energy analysis change in load conditions KLJUČNE RIJEČI glavna brodska parna turbina brodsko propulzijsko postrojenje energijska analiza promjena opterećenja

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Section: Introduction / Uvodmentioning

confidence: 99%

Energy Analysis of Main Propulsion Steam Turbine from Conventional LNG Carrier at Three Different Loads

Mrzljak

Poljak

2019

Naše more

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“…32 Two groups of injectors are symmetrically equipped on the cylinder head to accomplish the flexible injection strategies fueled with gas/diesel. 5,23,34,35 33 When switching to the diesel mode, a heavy fuel oil (HFO) amount that covers the full load is injected from the pilot injectors.…”

Section: Test Enginementioning

confidence: 99%

Effects of injection strategies on low‐speed marine engines using the dual fuel of high‐pressure direct‐injection natural gas and diesel

Liu

Wang

et al. 2019

Energy Science & Engineering

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Pilot‐ignited high‐pressure direct‐injection (HPDI) natural gas engines have drawn much attention since being proposed, as these engines can maintain high performance and lead to clean combustion compared with conventional diesel engines. This prospective concept is not only used in vehicle engines but also used in large‐scale marine engines. In this study, the effects of injection strategies of dual fuels on combustion characteristics and emissions were investigated using the computational fluid dynamics (CFD) code CONVERGE coupled with a reduced n‐heptane/methane mechanism. The results showed that the effects of absolute injection timing (AIT) on the combustion characteristics and emissions are similar to those of traditional diesel engines. As the AIT varies from advanced by 4°CA to retarded by 4°CA, the peak values of the in‐cylinder pressure and temperature decrease gradually. However, a conventional trade‐off between NOx and soot/CO/HC/ISFC emissions can also be observed as the AIT is retarded. In contrast, relative injection timing (RIT) has more complicated impacts on the combustion and emissions characteristics. The in‐cylinder temperature distribution and concentration stratification change as the gas jet initially interacts with the pilot flame. The effects of the gas injection timing on the combustion characteristics and indicated specific fuel consumption are also similar to those of the AIT, but the emissions are quite different. The pilot injection timing shows minimal influence on the main combustion process. Better performance can be obtained with partially premixed combustion with a slightly late injection timing compared with that of the original (ORG) base case.

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“…Today, by taking into account the entire world fleet, the dominant power producers for ship propulsion are marine slow speed two-stroke diesel engines [1]. Several authors have proposed improvement of such engines by using various additives in heavy fuel oil [2], by using alternative fuel mixtures with heavy fuel oil [3,4] or by using several water injection techniques [5]. Middle speed and fast speed fourstroke diesel engines are also used in marine propulsion plants, usually for the electricity generator drive or for other plant needs [6].…”

Section: Introductionmentioning

confidence: 99%

Energy Loss Analysis at the Gland Seals of a Marine Turbo-Generator Steam Turbine

Kocijel

Poljak

Mrzljak

et al. 2020

Teh. glas. (Online)

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The paper presents an analysis of marine Turbo-Generator Steam Turbine (TGST) energy losses at turbine gland seals. The analyzed TGST is one of two identical Turbo-Generator Steam Turbines mounted in the steam propulsion plant of a commercial LNG carrier. Research is based on the TGST measurement data obtained during exploitation at three different loads. The turbine front gland seal is the most important element which defines TGST operating parameters, energy losses and energy efficiencies. The front gland seal should have as many chambers as possible in order to minimize the leaked steam mass flow rate, which will result in a turbine energy losses' decrease and in an increase in energy efficiency. The steam mass flow rate leakage through the TGST rear gland seal has a low or negligible influence on turbine operating parameters, energy losses and energy efficiencies. The highest turbine energy efficiencies are noted at a high load -on which TGST operation is preferable.

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Performance and emission characteristics of additives-enhanced heavy fuel oil in large two-stroke marine diesel engine

Cited by 48 publications

References 17 publications

Energy Analysis of Main Propulsion Steam Turbine from Conventional LNG Carrier at Three Different Loads

Energy Analysis of Main Propulsion Steam Turbine from Conventional LNG Carrier at Three Different Loads

Effects of injection strategies on low‐speed marine engines using the dual fuel of high‐pressure direct‐injection natural gas and diesel

Energy Loss Analysis at the Gland Seals of a Marine Turbo-Generator Steam Turbine

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