Low Power
Steam Turbine Energy Efficiency and Losses During the Developed Power Variation

Mrzljak, Vedran

doi:10.31803/tg-20180201002943

Cited by 21 publications

(19 citation statements)

References 13 publications

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“…Investigations of turbogenerators [17] and similar low power steam turbines [18] during the change in developed power showed that this kind of steam turbines reaches its highest efficiencies at approximately 70 % -80 % of maximum load. Main feed water pump turbine usually consists of one Curtis stage [19] and is used for Main Feed water Pump (MFP) drive.…”

Section: Description and Operating Characteristics Of Marine Steam Prmentioning

confidence: 99%

“…3. -Main turbine real (polytropic) power: (18) -Main turbine ideal (isentropic) power: (19) -Main turbine energy loss: (20) -Main turbine energy efficiency: (21) -Main turbine energy power loss and real developed power ratio: (22) Steam specific enthalpies (h) and steam specific entropies (s) of the main propulsion turbine and both of its cylinders are calculated from measured steam temperatures and pressures at each operating point, Fig. 2, by using NIST REFPROP 9.0 software [41].…”

Section: Equations and Principles Of Marine Main Propulsion Steam Turmentioning

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: Description and Operating Characteristics Of Marine Steam Prmentioning

confidence: 99%

Section: Equations and Principles Of Marine Main Propulsion Steam Turmentioning

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 first law of thermodynamics defines the energy analysis of any control volume or system [28,29]. In a steady state, while disregarding potential and kinetic energy, for a standard control volume can be defined mass and energy balance equations, according to [30,31]:…”

Section: Equations For the Calculation Of Energy Loss Through Gland Smentioning

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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“…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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An 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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Low Power Steam Turbine Energy Efficiency and Losses During the Developed Power Variation

Cited by 21 publications

References 13 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 Loss Analysis at the Gland Seals of a Marine Turbo-Generator Steam Turbine

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

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