Operational Characteristic of Selected Marine Turbounits Powered by Steam from Auxiliary Oil-Fired Boilers

Behrendt, C.; Stoyanov, Rumen

doi:10.2478/ntpe-2018-0061

Cited by 12 publications

(10 citation statements)

References 3 publications

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“…At the end of steam expansion, one small part of the expanded steam is lost through the rear gland seal, while the rest of the expanded steam exits from TGST to the main marine steam condenser (TGST Outlet, Fig. 1) [14]. Steam gland seals operate in such a manner that they reduce steam pressure, while steam specific enthalpy (energy content) remains almost constant through the seal [15,16].…”

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

confidence: 99%

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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%

“…The energy efficiency of the analyzed TGST is calculated by using the Eq. (14), and the results are presented in Fig. 7 in regards to the steam mass flow rate lost through the front turbine gland seal.…”

Section: Figure 3 Steam Energy Power Input and Output Of Tgst At Thrementioning

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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show abstract

“…The analysis in this paper is performed on the basis of energy and energy flow streams, which are based on the first law of thermodynamics [34,35]. In comparison to other similar analysis [36][37][38] energy analysis did not take into consideration pressure and temperature of the ambient in which observed component or system operates [39][40][41].…”

Section: Equations and Simplifications Used In The Analysismentioning

confidence: 99%

The Leakage of Steam Mass Flow Rate through the Gland Seals – Influence on Turbine Produced Power

Mrzljak,

Kudláček,

Begić-Hajdarević

et al. 2020

JMTS

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In this paper is presented an analysis of gland seals operation and their influence on the performance of low power steam turbine with two cylinders and steam reheating, which can be used in marine applications. Performed analysis presents a comparison of steam turbine main operating parameters when gland seals operation is neglected (as usual in the most of the literature) and when steam mass flow rates leaked through all gland seals are taken into consideration. Steam mass flow rate leakage through all gland seals reduces produced power of the whole turbine and both of its cylinders. Operation of gland seal mounted at the inlet in the first cylinder of any steam turbine (cylinder which operates with the steam of the highest pressure) has the most notable influence on the reduction of the whole turbine produced power. Gland seal mounted at the outlet of the last turbine cylinder (cylinder which operates with the steam of the lowest pressure) did not have any influence on the reduction of steam turbine produced power. In any detail analysis of a steam turbine (especially the complex turbine with multiple cylinders), gland seals operation should be considered due to their notable influence on the turbine performance.

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“…The most common usage of steam turbines in marine applications is in the engine rooms of the LNG (Liquefi ed Natural Gas) carriers, which still has the steam propulsion system as a dominant one [6,7]. In such marine steam propulsion system all of the steam turbines (main turbine and auxiliary) are low-power turbines (main turbine maximum power usually did not exceed 30 MW, while auxiliary turbines maximum power usually did not exceed 5-6 MW) [8,9]. Auxiliary low-power steam turbines in such marine systems (turbo-generators for the electricity generator drive or steam turbines for water pumps drive) are simple steam turbines without steam extractions [10].…”

Section: Introduction / Uvodmentioning

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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Operational Characteristic of Selected Marine Turbounits Powered by Steam from Auxiliary Oil-Fired Boilers

Cited by 12 publications

References 3 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

The Leakage of Steam Mass Flow Rate through the Gland Seals – Influence on Turbine Produced Power

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

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