Thermodynamic Analysis of Different Configurations of Combined Cycle Power Plants

Ebaid, Munzer S. Y.; Al-Hamdan, Qusai Z.

doi:10.5539/mer.v5n2p89

Cited by 3 publications

(1 citation statement)

References 21 publications

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“…The CCP plant is based on the concept of generating power by utilizing the heat carried by the exhaust gases of gas turbines. Numerous investigations show that the pressure ratio [15][16][17], the turbine inlet temperature (TIT) [18][19][20], and the ambient temperature [21][22][23] are the dominating factors that increase/decrease the energy and exergy performance of CCP plants whereas the quest for efficiency improvement of the gas turbine is focused on three major areas: increasing the turbine inlet temperature, increasing turbo-machinery components efficiency, and basic cycle modifications [24][25][26]. Bazmi et al [27] theoretically examine power sector development and emphasize the major section of optimization and modeling of power plants for the future demand as a tool for the ecological energy field.…”

Section: Introductionmentioning

confidence: 99%

Archive of Mechanical Engineering

Khan,

Alzafiri

2022

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To meet the continuous demand for energy of industrial as well as commercial sectors, researchers focus on increasing the power generating capacity of gas turbine power plants. In this regard, the combined cycle is a better solution in terms of environmental aspects and power generation as compared to a simple gas turbine power plant. The present study is the thermodynamic investigation of five possible air bottoming combined cycles in which the topping cycle is a simple gas turbine cycle, regenerative gas turbine cycle, inter-cool gas turbine cycle, reheat gas turbine cycle, and intercool-reheat gas turbine cycle. The effect of pressure ratio of the topping cycle, the turbine inlet temperature of topping cycle, and ambient temperature on net power output, thermal efficiency, total exergy destruction, and exergetic efficiency of the combined cycle have been analyzed. The ratio of the net power output of the combined cycle to that of the topping cycle is maximal in the case when the topping cycle is a simple gas turbine cycle. The ratio of net power output and the total exergy destruction of the combined cycle to those of the topping cycle decrease with pressure ratio for all the combinations under study except for the case when the topping cycle is the regenerative gas turbine cycle. Nomenclaturew work net output, kW ṁ mass flow rate, kg/s h specific enthalpy, kJ/kg s specific entropy, kJ/(kg K

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Section: Introductionmentioning

confidence: 99%

Archive of Mechanical Engineering

Khan,

Alzafiri

2022

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The off-design modelling of a combined-cycle power plant

Naidu

2021

MATEC Web Conf.

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The objective of this project was to develop a model of a combined-cycle power plant in Flownex which can be solved in off-design conditions in order to compare it to plant data. The verification of this model will show that Flownex can be used to effectively and efficiently model a combined-cycle power plant. The process of development of the final Flownex model was achieved using various additional software. Initially, an analytical model was developed in Mathcad (software used for engineering calculations). Thereafter, a model was built in Virtual Plant, a thermodynamic modelling software for assessing plant performance. Finally, the Flownex model was designed. For the single, double, and triple pressure combined-cycle power plant systems, the analytical, Virtual Plant and Flownex models were compared. The results of all the models agreed closely with one another. The triple-pressure design and off-design Virtual Plant and Flownex models were also compared to plant data and it was concluded that Flownex was successful in modelling the design and offdesign conditions of a combined-cycle power plant.

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Gas turbine performance enhancement for naval ship propulsion using wave rotors

Fatsis

2021

Journal of Marine Engineering & Technology

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The propulsion demands of high speed naval vessels often rely on gas turbines fitted in small engine rooms, producing significant amounts of power achieving thus high performance requirements. Gas turbines can be used either to provide purely mechanical propulsion, or alternatively to generate electricity, which is subsequently used by electric drives to propel the ship. However, the thermal efficiencies of gas turbines are lower than those of Diesel engines of similar power, in addition to the fact that all gas turbines are less efficient as the ambient temperature rises, particularly for aero-derivative engines. In the context of improving the performance of existing marine gas turbines with minimum modifications to their baseline configuration, this article is proposing engine's performance enhancement by integrating a pressure wave supercharger (or wave rotor), while keeping the compressor, combustion chamber and turbine entry temperature of the baseline engine unchanged. Thermodynamic cycle analysis for two-shaft gas turbine engines configurations with and without heat exchanger to recuperate the waste heat from the exhaust gases, typical for marine propulsion is performed for the baseline engines, as well as for the topped with four-port wave rotor engines, at design point conditions and their performances are compared accordingly. Important benefits are obtained for four-port wave rotor-topped engines in comparison to the self-standing baseline engines for the whole range of engine's operation. It is found that the higher the turbine inlet temperature is, the more the benefit gain of the wave rotor topped engine is attained in terms of efficiency and specific power. It is also concluded that the integration of wave rotor particularly favours engines operating at low compressor pressure ratios and high turbine inlet temperatures. The effect of variation of the most important parameters on performance of the topped engine is investigated. It is concluded that wave rotor topping of marine gas turbines can lead to fuel savings and power increase.

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Thermodynamic Analysis of Different Configurations of Combined Cycle Power Plants

Cited by 3 publications

References 21 publications

Archive of Mechanical Engineering

Archive of Mechanical Engineering

The off-design modelling of a combined-cycle power plant

Gas turbine performance enhancement for naval ship propulsion using wave rotors

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