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

Kocijel, Lino; Poljak, Igor; Mrzljak, Vedran; Car, Zlatan

doi:10.31803/tg-20191031094436

Cited by 12 publications

(10 citation statements)

References 35 publications

(36 reference statements)

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“…cumulative exergy output cumulative exergy input (5) In standard operation of any system or a control volume, mass flow rate leakage of any fluid stream usually did not occur [53]. So, in standard operation, the mass flow rate balance [54] can also be applied: (6) Presented overall exergy equations and balances will be a baseline for defining all exergy equations during the analysis of whole observed waste heat recovery CO 2 closed-cycle gas turbine system as well as for defining exergy analysis equations of each system component.…”

Section: Overall Equations and Balances Valid For Any System Or A Conmentioning

confidence: 99%

Exergy analysis of marine waste heat recovery CO2 closed-cycle gas turbine system

et al. 2020

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This paper presents an exergy analysis of marine waste heat recovery CO2 closed-cycle gas turbine system. Based on the operating parameters obtained in system exploitation, it is performed analysis of each system component individually, as well as analysis of the whole observed system. While observing all heat exchangers it is found that combustion gases-CO2 heat exchangers have the lowest exergy destructions and the highest exergy efficiencies (higher than 92%). The lowest exergy efficiency of all heat exchangers is detected in Cooler (51.84%). Observed system is composed of two gas turbines and two compressors. The analysis allows detection of dominant mechanical power producer and the dominant mechanical power consumer. It is also found that the turbines from the observed system have much higher exergy efficiencies in comparison to compressors (exergy efficiency of both turbines is higher than 94%, while exergy efficiency of both compressors did not exceed 87%). The whole observed waste heat recovery system has exergy destruction equal to 6270.73 kW, while the exergy efficiency of the whole system is equal to 64.12% at the selected ambient state. Useful mechanical power produced by the whole system and used for electrical generator drive equals 11204.80 kW. The obtained high exergy efficiency of the whole observed system proves its application on-board ships.

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Section: Overall Equations and Balances Valid For Any System Or A Conmentioning

confidence: 99%

Exergy analysis of marine waste heat recovery CO2 closed-cycle gas turbine system

et al. 2020

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“…In the analyses of some control volumes, as for example in [25,36,87], mass flow rate leakages can be taken into account, but mass flow rate balance must always be satisfied because any mass flow rate cannot rise or disappear by itself.…”

Section: Exmentioning

confidence: 99%

“…Steam turbine operation in various power plants strongly differs. They can dominantly operate by using wet or superheated steam [23,24], they can be composed of one or more turbine cylinders [25,26], turbine cylinders can be single flow or dual flow (while dual flow cylinders can be symmetrical or asymmetrical) [27], turbine cylinders can be connected to the same or to the various shafts [28,29], steam turbines are nowadays dominantly composed of many stages (however, still in exploitation can be found steam turbines with only one stage used for various auxiliary purposes) [30,31], turbine stages can be of impulse, reaction or Curtis type [32], temperature and pressure of steam delivered to any steam turbine can significantly vary [33,34]. Therefore, observations which pointed out that any steam turbine operates in a same manner is valid only in the most general and overall form.…”

Section: Introductionmentioning

confidence: 99%

The influence of various optimization algorithms on nuclear power plant steam turbine exergy efficiency and destruction

et al. 2021

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This paper presents an exergy analysis of the whole turbine, turbine cylinders and cylinder parts in four different operating regimes. Analyzed turbine operates in nuclear power plant while three of four operating regimes are obtained by using optimization algorithms – SA (Simplex Algorithm), GA (Genetic Algorithm) and IGSA (Improved Genetic-Simplex Algorithm). IGSA operating regime gives the highest developed mechanical power of the whole turbine equal to 1022.48 MW, followed by GA (1020.06 MW) and SA (1017.16 MW), while in Original operating regime whole turbine develop mechanical power equal to 996.29 MW. In addition, IGSA causes the highest increase in developed mechanical power of almost all cylinders and cylinder parts in comparison to the Original operating regime. All observed optimization algorithms increases the exergy destruction of the whole turbine in comparison to Original operating regime - the lowest increase causes IGSA, followed by GA and finally SA. The highest exergy efficiency of the whole turbine, equal to 85.92% is obtained by IGSA, followed by GA (85.89%) and SA (85.82%), while the lowest exergy efficiency is obtained in Original operating regime (85.70%). Analyzed turbine, which operates by using wet steam is low influenced by the ambient temperature change. IGSA, which shows dominant performance in exergy analysis parameters of the analyzed turbine, in certain situations is overpowered by GA. Therefore, in optimization of steam turbine performance, IGSA and GA can be recommended.

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“…Q in (kW) is energy heat transfer, while . E in (kW) is a total flow energy (of any fluid stream), which can be defined according to [68] as: .…”

Section: General Energy and Exergy Equations And Balancesmentioning

confidence: 99%

Comparison of Exergy and Various Energy Analysis Methods for a Main Marine Steam Turbine at Different Loads

Anđelić

Mrzljak

Lorencin

et al. 2020

JMTS

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This paper present energy and exergy analysis of the main marine steam turbine, which is used for the commercial LNG (Liquefied Natural Gas) carrier propulsion, at four different loads. Energy analysis is performed by using four different methods. The presented analysis allows distinguishing advantages and disadvantages of all observed energy analysis methods and its comparison to exergy analysis of the same steam turbine. Each analysis is based on the measurement results obtained in main turbine exploitation conditions. Main turbine is composed of two cylinders – High Pressure Cylinder (HPC) and Low Pressure Cylinder (LPC). At low turbine loads, the dominant power producer is HPC, while at middle and high loads the dominant power producer is LPC. Energy analysis Method 1 which is based on the same principles as exergy analysis, should be avoided if the majority of turbine losses are not known. Other observed energy analysis methods can be applied in the analysis of any steam turbine, with a note that increase in ideal (isentropic) steam expansion process divisions will result with an increase in energy losses and with a decrease in energy efficiency. Energy analysis Method 2 which consist of only one ideal (isentropic) steam expansion process, for the whole turbine and at all observed loads, results with the lowest energy losses (in the range between 639.98 kW and 6434.17 kW) as well as with the highest energy efficiency (in a range between 53.70% and 79.40%) in comparison to other applicable energy analysis methods. For the observed loads, whole main turbine exergy destruction is in range from 608.64 kW to 5922.86 kW, while the exergy efficiency range of the whole turbine is between 54.94% and 80.73%. Exergy analysis and all three applicable energy analysis methods show that increase in the main turbine load results with simultaneous increase in turbine losses and efficiencies (both energy and exergy).

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

Cited by 12 publications

References 35 publications

Exergy analysis of marine waste heat recovery CO2 closed-cycle gas turbine system

Exergy analysis of marine waste heat recovery CO2 closed-cycle gas turbine system

The influence of various optimization algorithms on nuclear power plant steam turbine exergy efficiency and destruction

Comparison of Exergy and Various Energy Analysis Methods for a Main Marine Steam Turbine at Different Loads

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