Advanced [gas] Turbine System - Conceptual Design [final

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32 ABB Power Generation Inc. July 15, 2000 • The environmental impact of the uprating is favorable with reductions in Nox 33 ABB Power Generation Inc. 6 July 15, 2000 Conclusions ABB has completed its technology based program. The results developed under WBS 8, concentrated on technology development and demonstration have been partially implemented in newer turbine designs. A significant improvement in heat rate and power output has been demonstrated. ABB will use the knowledge gained to further improve the efficiency of its Advanced Cycle System, which has been developed and introduced into the marked out side ABB’s ATS activities.

Some of the cracking observed was in the bond coat below the TBC, which was intact. This type of cracking has been observed on occasion in engines, which had operated in peaking mode and had accumulated many cycles, but there is generally insufficient information on the fracture mechanism of engine-run parts in these conditions. In the testpieces examined here some of the cracks appeared to be emanating from the “rough surface” of the bond coat (Figure 22). Finite Element Analysis A finite element (FE) analysis was performed as part of a “Small Business R&D Project sponsored by NASA by DCT Technologies, a consulting engineering company located in Cleveland, and Figure 23 shows a schematic representation of the FE model.

The cooling cycle involved passing high pressure air through the hollow testpiece until the set temperature was reached and for testpieces coated with TBC the furnace opened automatically on cooling to enable heat to flow from the coated surface. Typical hysteresis loops are shown in Figure 4. A schematic representation of a typical strain-temperature-time profile is shown in Figure 5. The plastic strain, which occurred at the maximum temperature, resulted in a tensile stress being developed during cooling and returning to zero strains at 400 C.

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