Study on effective parameter of the triple-pressure reheat combined cycle performance

Abstract

The thermodynamic analyses of the triple-pressure reheat combined cycle gas turbines with duct burner are presented and discussed in this paper. The overall performance of a combined cycle gas turbine power plant is influenced by the ambient temperature, compression ratio and turbine inlet temperature. These parameters affect the overall thermal efficiency, power output and the heat-rate. In this study a thermodynamic model was development on an existing actual combined cycle gas turbine (CCGT) (In this case study, an effort has been made to enhance the performance of the CCGT through a parametric study using a thermodynamic analysis. The effect of ambient temperature and operation parameter, including compression ratio and turbine inlet temperature, on the overall performance of CCGT are investigated. The code of the performance model for CCGT power plant was developed utilizing the THERMOFLEX software. The simulating results show that the total power output and overall efficiency of a CCGT decrease with increase the ambient temperature because increase the consumption power in the air compressor of a GT. The totals power of a CCGT decreases with increase the compression rate, while the overall efficiency of a CCGT increases with increase the compression ratio to 21, after that the overall efficiency will go down. Far there more the turbine inlet temperature increases the both total power and overall efficiency increase, so the turbine inlet temperature has a strong effect on the overall performance of CCGT power plant. Also the simulation model give a good result compared with MARAFIQ CCGT power plant. With these variables, the turbine inlet temperature causes the greatest overall performance variation

Statistical analysis and optimum performance of the gas turbine power plant

“…However these are not forever positively activated in the turbine, these parameters should be properly controlled so that performance of gas turbine can be maintained accordingly. An efficient and accurate study must be carried out so as to maintain the parameters along with the working and capacity of the plant [21][22][23]. As per the required ISO conditions affecting the performance of GT power plant, a proper strategy must be followed to achieve the maximum output.…”

“…Furthermore, during the design stage, the influence of the ambient temperature on the performance of the CCGT plant to be considered. The heating temperature of the fuel gas results in a higher thermal efficiency of the GT due to the reduced fuel consumption [23,26,27]. Thamir and Rahman [8] examined thermodynamic analysis of the GT system.…”

Combined cycle power plant performance evaluation using exergy and energy analysis

“…The exergy losses in combined cycle plant and the components responsible for main sources of performance deterioration are investigated by Facchini et al [28]. Ibrahim and Rahman [29] performed thermodynamic analysis of a triple pressure reheat combined cycle GT plant having a duct burner. Oyedepo and Kilanko [30] reported that by cooling the compressor intake air with an evaporative cooler the performance of the GT power plant improves.…”

Effects of cycle peak temperature ratio on the performance of combined cycle power plant

“…C is the specific heat of air and m  is the mechanical efficiency of the compressor and turbine [29,31,32 …”