Change in Steam Generators Main and Auxiliary Energy Flow Streams During the Load Increase of LNG Carrier Steam Propulsion System

Mrzljak, Vedran; Prpić-Oršić, Jasna; Senčić, Tomislav

doi:10.31217/p.32.1.15

Cited by 15 publications

(17 citation statements)

References 19 publications

(21 reference statements)

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“…At high turbine load all the steam subtractions are opened and in such operation regime all steam propulsion plant components get a heating steam from the main turbine. Auxiliary systems also get a steam from the main turbine, which means that auxiliary steam flow from steam generators in this operation regime is almost equal to zero [13].…”

Section: Measurement Results Of Analyzed Marine Main Propulsion Steammentioning

confidence: 99%

“…Both steam generators have combined burners which can burn only one fuel (HFO or gas), or a combination of that two fuels [12]. Both steam generators produce a main steam flow stream (steam of the highest allowed temperature and pressure) which is led to main and auxiliary steam turbines and simultaneously auxiliary steam flow stream (steam with decreased temperature in comparison to the main steam stream) for additional heating purposes and for its usage in auxiliary ship systems [13]. One important steam plant component which uses auxiliary steam flow stream is Air Heater (AH), which is used for increasing air temperature before its entrance in steam generators.…”

Section: Description and Operating Characteristics Of Marine Steam Prmentioning

confidence: 99%

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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: Measurement Results Of Analyzed Marine Main Propulsion Steammentioning

confidence: 99%

Section: Description and Operating Characteristics Of Marine Steam Prmentioning

confidence: 99%

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

Mrzljak

Poljak

2019

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“…The energy power of a fluid flow stream can be defined by knowing the fluid stream mass flow rate as well as the fluid stream pressure and temperature (necessary for calculation of fluid stream specific enthalpy). Therefore, the energy power of a fluid flow stream is [60]:…”

Section: General Equations For Energy and Exergy Analysesmentioning

confidence: 99%

Energy and Exergy Analyses of Forced Draft Fan for Marine Steam Propulsion System during Load Change

Mrzljak

Blecich

Anđelić

et al. 2019

JMSE

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A forced draft fan, used for the supply of combustion air into the steam generator of the conventional liquefied natural gas (LNG) carrier was analyzed from the aspect of energy and exergy. The power delivered from the induction motor to the fan was calculated using the manufacturer’s data. The most significant impact on the fan energy power losses is from the air temperature difference between the fan outlet and inlet. The fan energy power losses are inversely proportional to the fan energy efficiency, and the values are between 19.9% and 63.4%, for the entire range of observed steam system loads. The fan exergy destruction depends primarily on the driving power and on the air mass flow rate. At higher loads, an important influence on the fan exergy destruction is from the air pressure at the fan outlet. The exergy efficiency change of the analyzed fan, for the range of observed steam system loads, is directly proportional to the rate of change in the air mass flow, whereas the obtained values of exergy efficiency are between 5.10% and 53.93%. The impact of ambient temperature on the fan exergy destruction and exergy efficiency exhibits is different than in most other steam system components. A change in ambient temperature of 10 °C causes a change in the exergy efficiency of the forced draft fan less than 0.5% in the entire range of observed steam loads.

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“…The first law of thermodynamics defines energy analysis [28]. Energy analysis of any system or control volume is related to the conservation of energy [29]. Mass and energy balance equations for a control volume in steady state can be expressed according to [30] and [31] by equations:…”

Section: Energy and Exergy Analysis Of Any Control Volumementioning

confidence: 99%

Energy and Exergy Analysis of the Condensate Pump During Internal Leakage from the Marine Steam Propulsion System

2018

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A B S T R A C TAn energy and exergy analysis of the condensate pump from the marine steam propulsion system during the condensate leakage between pump stages is presented in this paper. Measurements from the steam propulsion system during exploitation were necessary for collecting all the data for the condensate pump analysis. Due to condensate leakage inside the pump casing, the producer specified condensate pressures at the pump outlet could not be obtained during the exploitation. Low condensate pressure at the pump inlet and condensate temperature slightly above the atmospheric significantly influences the pump exergy analysis. Increase in pump load resulted in an increase of pump energy and exergy losses and efficiencies. In the observed load range during the leakage, pump energy losses are between 19.88 kW and 24.78 kW, while pump energy efficiencies are between 11.12 % and 41.54 %. Pump exergy losses are slightly higher, while exergy efficiencies are slightly lower when compared to energy losses and efficiencies. During normal operation, without leakage, the pump energy efficiencies are from 5 % to 20 % higher in comparison with pump operation when the leakage occurs.

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Change in Steam Generators Main and Auxiliary Energy Flow Streams During the Load Increase of LNG Carrier Steam Propulsion System

Cited by 15 publications

References 19 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

Energy and Exergy Analyses of Forced Draft Fan for Marine Steam Propulsion System during Load Change

Energy and Exergy Analysis of the Condensate Pump During Internal Leakage from the Marine Steam Propulsion System

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