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II.2.2. Reheat Advantages in Gas Turbines Asea Brown Boveri (ABB)1 introduced a new generation of high efficiency gas turbines with two sequential combustion stages in the mid 90’s (GT24/GT26), shown in Figure 6. In addition to high efficiency, these gas turbine engines have shown superior flexibility in operation and low emission since their launch [20], [21]. Since the 80’s, the advantages of reheat process in gas turbines are discussed in multiple studies by ABB researchers [6], [9], [21], [22]. GT24/GT26 engines use an EV (EnVironmental) burner in the first combustion stage and an SEV (Sequential EnVironmental) burner in the second combustion stage. Combination of the two concepts of low emission EV-burner and sequential combustion in a single shaft engine, GT24/GT26, created a machine with high power density and small footprint. In these engines, a reheat combustor makes a more efficient use of the oxygen by burning twice in lean premix mode. High peak flame temperatures which lead to increase in NOx are avoided in a double stage combustion engine. In addition, the unburned fuel particles from the first combustion stage will be burned in the next combustor. The other reason for the low NOx-emission in a reheat engine, is that second stage combustion occurs at lower O2 and higher H2O levels compared to the first one [21]. This allows for the second combustor to operate at a high flame temperature and produce lower NOx compared to a single combustor at the same temperature. With regards to the engine flexibility, the reheat concept allows the combustors to work at a different temperature without a significant effect on the total 1 Now GE-Alstom 20PDF Image | DEVELOPMENT OF AN ULTRA-HIGH EFFICIENCY GAS TURBINE ENGINE (UHEGT
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