Energy analysis of Brayton combined cycles

Polyzakis, Apostolos; Koroneos, C.; Xydis, George; Malkogianni, A. K.

doi:10.1504/ijex.2008.020831

Cited by 5 publications

(5 citation statements)

References 14 publications

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“…Combined cycle integrates the Brayton and Rankine cycles (Polyzakis et al 2008) to achieve higher system efficiency, and consists of three major parts, which are gas turbine (GT), heat recovery steam generator (HRSG), and steam turbine (ST). The process diagram of an NGCC power plant is shown in Fig.…”

Section: Combined Cycle Systemmentioning

confidence: 99%

Potential assessment on gas turbine combined cycle with alternative gaseous fuel from coal gasification

Chyou

Chiu

Chen

2015

Clean Techn Environ Policy

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In the 21st century, fossil fuels will remain the mainstay of energy production, while natural gas combined cycle (NGCC) features environmental benignity and high efficiency. Hence, it is desirable to assess the potential of NGCC for power generation, in which gas turbine (GT) is operated with alternative gaseous fuel from coal gasification, since coal is the most abundant fossil fuel. Systemlevel analyses for NGCC plants, combining advanced GTs with various fuels, are performed in this study. The commercial chemical process simulator, Pro/II Ò V8.1.1, is implemented to build the simulation models. This work further performs various analyses as the basic and feasibility cases. The former is the benchmark case verified with the reference data of an operating NGCC power plant located in northern Taiwan. The latter introduces a feasibility study with advanced GTs and actual parameters in Taiwan. Alternative fuel, including synthetic natural gas (SNG) or a mixture of SNG and syngas, is fed to combined cycle for evaluating the overall performance. The results indicate that the system output or efficiency in either case is slightly (2-3 % points, LHV) lower than the counterpart in the benchmark one. In Taiwan, the natural gas price is much higher than that of coal, and results in higher idle capacity of NGCC. The advantage of adopting SNG to NGCC is that it could increase the capacity factor and subdue the environmental impact of the energy portfolio. The outcome of this study indicates a possible means to utilize coal more efficiently and reduce emissions.

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Section: Combined Cycle Systemmentioning

confidence: 99%

Potential assessment on gas turbine combined cycle with alternative gaseous fuel from coal gasification

Chyou

Chiu

Chen

2015

Clean Techn Environ Policy

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“…Gas turbine units have very good manoeuvrability. Starting and reaching the maximum load is possible in a very short period, no more than 30 minutes, therefore, use in half-peak mode is common when operating in a common power system [2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Study of the operation of a 110 MW combined-cycle power unit at minimum loads when operating on the wholesale electricity market

2020

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Currently, all generating equipment with a capacity of more than 25 MW operates in the wholesale electricity market. The operation of combined cycle gas turbines is complicated by the implementation of daily load schedules. A distinctive feature of the operation of combined-cycle units is the presence of a gas and steam turbine in the cycle. In this paper, the variable operating modes of a combined cycle plant are considered. The minimum effective load of a gas and steam turbine is determined. An example of the real operation of a steam turbine that is included in a combined cycle plant 110 MW power unit at an operating combined heat and power is shown. The optimal minimum load of a combined cycle gas turbine unit has been determined. As a result of the research, the values of high and low pressure steam flow rates, fuel gas consumption, steam and gas turbine power were obtained. Based on the research results, the optimal minimum load of a combined cycle gas turbine unit was found - 40 MW. This load allows the main and auxiliary equipment to work without compromising reliability.

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“…Αυτό έχει σαν αποτέλεσµα η τιµή του να µεταβάλλεται από το µηδέν στη χειρότερη περίπτωση (πλήρης απώλεια της εξέργειας) έως την µονάδα στην καλύτερη περίπτωση (καµιά καταστροφή της εξέργειας). Έτσι λοιπόν, ο εξεργειακός βαθµός απόδοσης ζ ορίζεται ως εξής [8]:…”

Section: έργο =F (αρχική κατάσταση διαδροµή διεργασίας τελική κατάσταση)unclassified

“…Της βιοµάζας κυµαίνεται από 25 -60% ανάλογα το ενεργειακό µείγµα (τη θερµογόνο δύναµη του καύσιµου υλικού, το βαθµό ξηρότητας, την οµογενοποίηση του µίγµατος, τις προσµίξεις κ.α.) [8], [82], [91] της γεωθερµικής ενέργειας θεωρήθηκε σταθερός κοντά στο 80% (άλλωστε στην Ελλάδα σε µία το πολύ δύο περιφέρειες της είναι δυνατόν να παραχθεί ηλεκτρική ενέργεια, οπότε ο βαθµός απόδοσης είναι πρακτικά σταθερός) [11], [92], [93]. Ο βαθµός απόδοσης ενεργειακής ηλεκτρικής µετατροπής αιολικής ενέργειας υπολογίστηκε 20% -38% [94], [95] ενώ ο βαθµός απόδοσης υδροηλεκτρικής ενέργειας υπολογίστηκε σε 35% -45%…”

Section: μαθηµατικό μοντέλο πολυκριτηριακής και εξεργειακής ανάλυσης -εφαρµογή ανά περιφέρειαunclassified

“…Κέντρο Ανανεώσιµων Πηγών Ενέργειας ( Πρόγραµµα: ALTENER ), «Εγχειρίδιο Ανανεώσιµων Πηγών Ενέργειας : Ενέργεια από Βιοµάζα»[7]. Πρόγραµµα ALTENER II -Οδηγός για τους επενδυτές, την τοπική και την νοµαρχιακή αυτοδιοίκηση, «Ανανεώσιµες Πηγές Ενέργειας στην Κρήτη»[8]. Σδρόλιας Θ., Βάµβουκα ∆., «Μελέτη για την ενεργειακή αξιοποίηση της βιοµάζας στην Κρήτη», Χανιά 1999[9].…”

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Εξεργειακή Και Πολυκριτηριακή Ανάλυση Στη Διαχείριση Στερεών Αποβλήτων Με Τη Χρήση Ανανεώσιμων Πηγών Ενέργειας

Ξύδης¹,

Xydis²

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Κεφάλαιο 1 ο ___________________________________________________________________________________________________ 9 αξιοποίησης αποβλήτων µε υφιστάµενα δίκτυα µεταφοράς ενέργειας. Παράλληλα εξετάστηκε µε πραγµατικά δεδοµένα και µε βάση εξεργοοικονοµικά κριτήρια, η εφαρµογή της ανάκτησης ενέργειας σε όλη την Επικράτεια για κάθε µια από τις 13 περιφέρειες.

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Energy analysis of Brayton combined cycles

Cited by 5 publications

References 14 publications

Potential assessment on gas turbine combined cycle with alternative gaseous fuel from coal gasification

Potential assessment on gas turbine combined cycle with alternative gaseous fuel from coal gasification

Study of the operation of a 110 MW combined-cycle power unit at minimum loads when operating on the wholesale electricity market

Εξεργειακή Και Πολυκριτηριακή Ανάλυση Στη Διαχείριση Στερεών Αποβλήτων Με Τη Χρήση Ανανεώσιμων Πηγών Ενέργειας

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