Utilizing exergy analysis in studying the performance of steam power plant at two different operation mode

ElHelw, Mohamed; Dahma, Kareem Saad Al; Attia, Abdelhamid

doi:10.1016/j.applthermaleng.2019.01.003

Cited by 54 publications

(28 citation statements)

References 16 publications

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“…2 [17]. The majority of marine steam power plant components are the same as in land-based steam power plants [18,19], but the operation of a marine steam plant must be much more dynamic. Along with the already mentioned two identical Turbo-Generator Steam Turbines, the marine steam system also consists of two identical steam generators [20] in front of which forced draft fans [21] and air heaters (air is heated with steam) [22] are mounted.…”

Section: Description Of the Analyzed Marine Tgst And The Steam Power mentioning

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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Section: Description Of the Analyzed Marine Tgst And The Steam Power mentioning

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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“…Specifi c exergies in each turbine operating point (presented in Table 1) are calculated for the base ambient state (the base ambient conditions) which is in this paper taken as proposed in [42]: -pressure: p 0 = 100 kPa = 1 bar, -temperature: T 0 = 298 K = 25 °C.…”

Section: Operating Parameters Of Low-power Steam Turbine With One Extmentioning

confidence: 99%

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

et al. 2020

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The paper presents thermodynamic (energy and exergy) analysis of low-power steam turbine with one extraction for marine applications. Analyzed steam turbine is divided in two parts-High Pressure (HP) part before steam extraction and Low Pressure (LP) part after steam extraction. Analysis shows that HP turbine part produces the majority of cumulative turbine power and consequentially has higher mechanical, energy and exergy losses when compared to LP turbine part. Regardless of heavier operating conditions, LP turbine part has higher effi ciencies and lower specifi c losses (in both energy and exergy analysis) when compared to HP turbine part. Whole analyzed turbine has energy and exergy effi ciencies equal to 62.84% and 65.58%, while energy and exergy turbine losses are 696.74 kW and 618.50 kW. Cumulative produced power at the turbine shaft outlet is equal to 1178.40 kW. Steam extraction which divides analyzed turbine on HP and LP part can deliver a notable amount of heat to any marine heat consumer, what represents a signifi cant advantage of observed turbine in comparison with similar low-power marine steam turbines which usually does not have steam extractions. Sažetak U radu je prikazana termodinamička (energijska i eksergijska) analiza parne turbine male snage s jednim oduzimanjem pare za primjenu u pomorstvu. Analizirana parna turbina podijeljena je u dva dijela-visokotlačni dio (HP) prije oduzimanja pare i niskotlačni dio (LP) nakon oduzimanja pare. Analiza pokazuje da visokotlačni dio proizvodi većinu snage turbine i posljedično ima veće mehaničke, energijske i eksergijske gubitke u usporedbi s niskotlačnim dijelom turbine. Bez obzira na teže radne uvjete, niskotlačni dio turbine ima veću učinkovitost i manje specifi čne gubitke (u energijskoj i eksergijskoj analizi) u usporedbi s visokotlačnim dijelom turbine. Cijela analizirana turbina ima energijsku i eksergijsku učinkovitost jednaku 62.84 % i 65.58 %, dok su gubici energije i eksergije turbine 696.74 kW i 618.50 kW. Kumulativna proizvedena snaga na izlazu turbinskog vratila jednaka je 1178.40 kW. Oduzimanjem pare kojim se analizirana turbina dijeli na visokotlačni i niskotlačni dio može se isporučiti značajna količina topline bilo kojem potrošaču topline u pomorskoj industriji, što predstavlja značajnu prednost promatrane turbine u usporedbi sa sličnim brodskim parnim turbinama male snage koje obično nemaju oduzimanje pare. KEY WORDS steam turbine low-power steam extraction marine applications thermodynamic analysis KLJUČNE RIJEČI parna turbina mala snaga oduzimanje pare primjena u pomorstvu termodinamička analiza

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“…The second law of thermodynamics, which is related to the change in fluid specific entropy, is a baseline for the exergy analysis of any system or a control volume [69,70]. General exergy balance equation, according to [71,72], is:…”

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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Utilizing exergy analysis in studying the performance of steam power plant at two different operation mode

Cited by 54 publications

References 16 publications

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

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

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

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

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