Abstract
Thermodynamic analysis of a closed cycle, solar powered Brayton gas turbine power plant with Concentrating Receiver system has been studied. A Brayton cycle is simpler than a Rankine cycle and has an advantage where the water is scarce. With the normal Brayton cycle a Concentrating Receiver System has been analysed which has a dependence on field density and optical system. This study presents a method of optimization of design parameter, such as the receiver working temperature and the heliostats density. This method aims at maximizing the overall efficiency of the three major subsystem that constitute the entire plant, namely, the heliostat field and the tower, the receiver and the power block. The results of the optimization process are shown and analysed.
Highlights
The reduction of fossil-fuel based power production by using solar power technology is one important step in the international commitment of CO2 reduction
The computation approach described in this study considers each subsystem separately
As decreases or the maximum cycle temperature increases, the efficiency increases and there is an optimum compression pressure ratio for any value of which can be found by the equation (18)
Summary
The reduction of fossil-fuel based power production by using solar power technology is one important step in the international commitment of CO2 reduction. The direct way of producing electric power from solar energy, the photovoltaic technology (PV), is gradually extending its focus from purely decentralized small-scale systems towards large-area bulk power production but still the cost of this kind of power generation plants is very high. The other way of power generation is thermal conversion of solar energy into electricity by using either Rankine cycle or Brayton cycle. In the Rankine cycle, steam is generated at low temperatures may be around 540-600oC, by using the solar energy in the receiver, but the pressure must be high [2]. Gas can operated in the Brayton cycle at a higher temperature, say 800oC, while keeping the pressure lower. As the temperature attained is very high in Brayton cycle, the efficiency will be high [3]
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