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thermal efficiency of gas turbines from 5% to 7% above the current highest efficiency gas turbines such as ABB GT24/26 (at full load: 40.5%). To demonstrate the innovative claim of the UHEGT-concept, a study is conducted comparing three conceptually different power generation gas turbine engines: a conventional gas turbine (single shaft, single combustion chamber), a gas turbine with sequential combustion (GT24/26), and a UHEGT [8]. The evolution of the gas turbine process that represents the efficiency improvement is shown in Figure 9. In this study, the working fluid is an ideal reacting mixture of methane and air. The compression and each expansion processes is specified with polytropic efficiencies of 90% and 88%, respectively. The energy exchange at each section is calculated based on the static enthalpy difference between inlet and exit. The total net power is computed by adding turbine powers of all stages and subtracting the total compressor power and the power due to the bearing losses. The thermal efficiency is the ratio of the total net power to the fuel energy. Figure 9a shows a conventional single combustion process in which thermal efficiency is around 32-36% (based on the different turbine inlet temperatures). Substantial efficiency improvement was achieved by introducing a single reheat turbine stage as shown in Figure 9b. By utilizing a higher compression ratio in GT24/26 and a two-stage combustion process, the efficiency of the machine was considerably improved without any significant increase in TIT. The cross-hatched area refers to the baseline process and the simple-hatched area translates to the net work increase. This will lead to 13PDF Image | DEVELOPMENT OF AN ULTRA-HIGH EFFICIENCY GAS TURBINE ENGINE (UHEGT
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