Thermoeconomic optimization of gas turbine cogeneration plants

Karaali, Rabi; Öztürk, Ilhan

doi:10.1016/j.energy.2014.12.004

Cited by 34 publications

(19 citation statements)

References 35 publications

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“…In the literature various methods are applied to the gas turbine cogeneration cycles to improve the efficiency. The most effective methods are optimization, reducing auxiliary power consumption, increasing gas turbine inlet air temperature, air preheating, fuel preheating, intercooling, increasing compressor inlet air pressure, hydrogen cooled generators, cooling of the inlet air of the compressor, humidification of the inlet air of the compressor, increasing air excess rates, advanced gas turbine cooling, steam injection, multiple pressure cycle with reheat and better HRSG design [1,2,7,8].…”

Section: The Results and Discussionmentioning

confidence: 99%

“…The thermodynamic model, energy and exergy analyses procedure is applied step by step as follows for the air preheated (CGAM) cycle. The functions of the temperature dependent specific enthalpies and, temperature-pressure dependent specific entropies can be found in literature [3,17].…”

Section: Thermodynamic Model Of the Cogeneration Systemsmentioning

confidence: 99%

“…The outlet temperature of the heat recovery steam generator is taken as 400 K to avoid corrosive sulfuric acid formation in the exhaust. The air compressor flow rate is 1 m  = 91,4 kg/s, the HRSG mass flow rate is s m  = 14 kg/s saturated steam at 2000 kPa, the power of gas turbine is 30 MW, and the flow rate of fuel (methane) is f m  = 1,64 kg/s [3,6]. The working fluid is assumed to be ideal gas (methane).…”

Section: Thermodynamic Model Of the Cogeneration Systemsmentioning

confidence: 99%

“…Cogeneration systems can work with high capacity and high efficiency nearly all year. Cogeneration systems save 30 % more energy than conventional energy systems [1,2,3]. These power systems produce also less emissions and less CO 2 .…”

Section: Introductionmentioning

confidence: 99%

“…In this study economic assessment will be ignored and only thermodynamic analyses of the cogeneration systems (not multi generation) will be considered and performed. However the thermo-economic optimization and economic assessment of these cycles can be found in the literature [17,18].…”

Section: Introductionmentioning

confidence: 99%

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Efficiency improvement of gas turbine cogeneration systems

Karaali

Öztürk

2017

Teh. vjesn.

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Original scientific paper In this study eight methods are evaluated for a gas turbine cogeneration cycle to improve the efficiency. These methods are increasing gas turbine inlet air temperature, cooling the inlet air of the compressor, air preheating, fuel preheating, increasing compressor inlet air pressure, increasing air excess rates, steam injection, and humidification of the inlet air of the compressor. These methods are studied in order to compare their effects on the performance of the systems. The effects of these methods on the exergetic efficiency depend on the kind of the cogeneration cycle. By combining recuperation, preheating fuel and steam injection methods high efficiency can be achieved. The combined methods give the best results under variable heat demands of the market. An appropriate combination of the efficiency improvement methods may increase the exergetic efficiency about 20 %. The results show that efficiency improvement methods must be applied together whenever it is possible. Keywords: cogeneration; efficiency; improvements Poboljšanje učinkovitosti kogeneracijskih sustava plinske turbineIzvorni znanstveni članak U radu se procjenjuje osam metoda za poboljšanje učinkovitosti kogeneracijskog ciklusa plinske turbine. Tim se metodama povećava temperatura ulaznog zraka plinske turbine, rashlađuje ulazni zrak kompresora, predgrijava zrak, predgrijava gorivo, povećava tlak ulaznog zraka kompresora, povećava brzina viška zraka, ubrizgava para i vlaži ulazni zrak kompresora. Te se metode istražuju kako bi se usporedilo njihovo djelovanje na performanse sustava. Učinci tih metoda na egzergetsku učinkovitost ovise o vrsti kogeneracijskog ciklusa. Kombiniranjem metoda rekuperacije, predgrijavanja goriva i ubrizgavanja pare može se postići visoka učinkovitost. Kombinirane metode daju najbolje rezultate kod različitih potreba tržišta za toplinom. Odgovarajućom kombinacijom metoda za poboljšanje učinkovitosti može se povećati egzergetska učinkovitost za oko 20 %. Rezultati pokazuju da se metode za poboljšanje učinkovitosti moraju primijeniti zajedno kada je god to moguće.

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Section: The Results and Discussionmentioning

confidence: 99%

Section: Thermodynamic Model Of the Cogeneration Systemsmentioning

confidence: 99%

Section: Thermodynamic Model Of the Cogeneration Systemsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Efficiency improvement of gas turbine cogeneration systems

Karaali

Öztürk

2017

Teh. vjesn.

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Thermodynamic and economic analysis of performance evaluation of all the thermal power plants: A review

Ahmadi

Nazari

Sadeghzadeh

et al. 2018

Energy Science & Engineering

104

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Surging in energy demand makes it necessary to improve performance of plant equipment and optimize operation of thermal power plants. Inasmuch as thermal power plants depend on fossil fuels, their optimization can be challenging due to the environmental issues which must be considered. Nowadays, the vast majority of power plants are designed based on energetic performance obtained from first law of thermodynamic. In some cases, energy balance of a system is not appropriate tool to diagnose malfunctions of the system. Exergy analysis is a powerful method for determining the losses existing in a system. Since exergy analysis can evaluate quality of the energy, it enables designers to make intricate thermodynamic systems operates more efficiently. These days, power plant optimization based on economic criteria is a critical problem because of their complex structure. In this study, a comprehensive analysis including energy, exergy, economic (3‐E) analyses, and their applications related to various thermal power plants are reviewed and scrutinized.

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