Abstract
Gas turbines (GT) have come to play a significant role in distributed energy systems due to its multi-fuel capability, compact size and low environmental impact and reduced cost. Nevertheless, the low electrical efficiency, typically about 30% (LHV), is an important obstruction to the development of the GT plants. New strategies are designed for the GT plant, to increase the overall performance based on the operational modeling and optimization of GT power plants. The enhancing strategies effect on the GT power plant’s performance (with intercooler, two-shaft, reheat and regenerative) based on the real power plant of GT. An analysis based on thermodynamics has been carried out on the modifications of the cycle configurations’ enhancements. Then, the results showed the effect of the ambient and turbine inlet temperatures on the performance of the GT plants to select an optimum strategy for the GT. The performance model code to compare the strategies of the GT plants were developed utilizing the MATLAB software. The results show that, the best thermal efficiency occurs in the intercooler-regenerative-reheated GT strategy (IRHGT); it decreased from 51.5 to 48%, when the ambient temperature increased (from 273 to 327K). Furthermore, the thermal efficiency of the GT for the strategies without the regenerative increased (about 3.3%), while thermal efficiency for the strategies with regenerative increased (about 22%) with increased of the turbine inlet temperature. The lower thermal efficiency occurs in the IHGT strategy, while the higher thermal efficiency occurs in the IRHGT strategy. However, the power output variation is more significant at a higher value of the turbine inlet temperature. The simulation model gives a consistent result compared with Baiji GT plant. The extensive modeling performed in this study reveals that; the ambient temperature and turbine inlet temperature are strongly influenced on the performance of GT plant.
Highlights
The parameter influence in terms of ambient temperature and turbine inlet temperature on the performance of the Gas turbines (GT) cycle power plant for different performance enhancing strategies is presented
The effects of these parameters on the power output, specific fuel consumption and thermal efficiency are obtained by applying the energy-balance utilizing MATLAB software
The increase in the power consumption in the compressor with increased ambient temperatures leads to a decrease in the power output of the GT plant
Summary
Because of the high ambient temperatures, decrease in electricity generation is noticed and this causes the increase in fuel consumption [11]. The thermal efficiency of GT plant was continuously being developed for the previous 70 years by increasing the turbine inlet temperature. This increase was adopted by enhancing the technology of materials involved and different cooling methodologies of the blades [12]. The inductor of the performance of the GT cycle has been the fuel consumption, power output and thermal efficiency [17]. It has been observed that the optimum thermal efficiency and power output happens at low ambient temperature and high turbine inlet temperature
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