Abstract
The proper utilization of all the available forms of energy resources has become imminent to meet the power requirement and energy demand in both the developed and developing countries of the world. Even though the emphasis is given to the renewable resources in most parts of the world, but fossil fuels will still remain the main resources of energy as these can meet both normal and peak demands. Saudi Arab has number of power plant based on natural gas and fuel that are spread in all its regions. These power plants have aeroderivative gas turbine units supplied by General Electric Company as main power producing units. These units work on dual fuel systems. These units work as simple gas turbine units to meat peak demands and as part of combined cycle otherwise. The subject matter of this study is the performance of one of the units of a power plant situated near Riyadh city of Saudi Arab. This unit also works both as simple gas turbine unit and as a part of combined cycle power plant unit. A parametric based performance evaluation of the unit has been carried out to study both energetic and exergetic performance of the unit for both simple and combined cycle operation. Effect of compressor inlet temperature, turbine inlet temperature, pressure ratio of the compressor, the stage from which bleed off air have been taken and percentage of bleed off air from the compressor on the energetic and exergetic performance of the unit have been studied. The study reveals that all these parameters effect the performance of the unit in both modes of operation.
Highlights
Gas turbines plays a key role in power generation market
The variation demonstrates that both these efficiencies decrease with the increase in compressor inlet temperature and the decrease becomes steeper after the compressor inlet temperature of 200 °C
The exergetic efficiencies are lower than the energetic efficiencies for all compressor inlet temperatures and at all turbine inlet temperatures
Summary
Gas turbines plays a key role in power generation market. These produce clean, efficient, affordable, and fuel-flexible electric power. Gas turbine plants are used for production of electricity in most of the countries of the world because of their low capital cost, short synchronization time and grid stability Jabber, et al [1]. Working on the basis of Brayton cycle, conventional gas turbine cycle consists an axial compressor for pressurizing air followed by combustion chamber for combustion of the fuel in presence of air. The heated air is expanded in an axial turbine, where the energy transformation takes place from thermal energy of working fluid to mechanical energy of shaft rotation that is connected to generator to produce electrical power (Fig. 1)
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