Analysis of Low-Power Steam Turbine With One Extraction for Marine Applications

Medica-Viola, Vedran; Mrzljak, Vedran; Anđelić, Nikola; Jelić, Maro

doi:10.17818/nm/2020/2.1

Cited by 9 publications

(7 citation statements)

References 39 publications

(42 reference statements)

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“…4. For the specific exergies calculation must be defined the ambient base (dead) state for which the calculations are performed [29,30]. Ambient base (dead) state for the exergy analysis can be selected provisionally [31,32] and is related to the pressure and temperature of the ambient in which system or a control volume operates.…”

Section: Introductionmentioning

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: Introductionmentioning

confidence: 99%

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

et al. 2020

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“…In the energy and exergy analyses of any system or a component, a few overall equations and balances must always be satisfied [45,46]. The energy analysis is defined according to the first law of thermodynamics, which means that it is not dependable on the ambient conditions in which analyzed system or a component operates [47,48].…”

Section: General Equations and Balancesmentioning

confidence: 99%

Energy and Exergy Analysis of Waste Heat Recovery Closed-Cycle Gas Turbine System while Operating with Different Medium

Mrzljak

Kudláček

Šegota

et al. 2021

JMTS

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In this paper is performed energy and exergy analysis of waste heat recovery closed-cycle gas turbine system. Analyzed system can use waste heat from various main propulsors (gas turbines or internal combustion engines). Basically, the observed system operates by using CO2, what was the baseline for the analysis. It is investigated did the observed system, while retaining the same configuration, can operate with different operating mediums instead of CO2. Other observed operating mediums were Air and Helium. During the change in operating medium, pressures and temperatures in some system operating points cannot remain the same as in the process with CO2, but the intention was to perform only the necessary changes (to ensure proper operation of each system component). Obtained results show that the system, while retaining the same configuration, can operate by using different operating mediums. Energy analysis of the system shows that the whole configuration is composed to operate with CO2, because the whole system energy efficiency is much higher than in operation with Air or Helium. The energy efficiency of the whole system during operation with CO2 is 87.68%, with Air is 58.39% and operation with Helium gives energy efficiency of 49.25%. Exergy analysis of the observed system shows that the system has a good potential to operate with other mediums, because in any observed situation exergy efficiency of the whole system was higher than 50%. In this analysis the highest exergy efficiency of the whole system was obtained during operation with Air (57.76%). In the observed system, low-temperature regenerator and main turbo-compressor are detected as components which are highly influenced by the change of operating medium. Therefore, these two components should be a baseline for further improvements and system optimization.

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“…In Eq. 3 and throughout this paper, is exergy destruction (exergy loss) in (kW), while in (kW) is an exergy heat transfer at the temperature T, which can be defined by the equation [73,74]:…”

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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Analysis of Low-Power Steam Turbine With One Extraction for Marine Applications

Cited by 9 publications

References 39 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

Energy and Exergy Analysis of Waste Heat Recovery Closed-Cycle Gas Turbine System while Operating with Different Medium

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

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