Title: Gas turbines increase power and efficiency of steam power plants
Abstract: The paper presents two concepts typical for repowering of steam plants: feedwater heater repowering and reheat steam repowering (or parallel repowering). Additional power mainly is due to the gas turbine. In both concepts the steam turbine contributes to the higher output. Additional fuel is necessary. But it is converted into useful energy with the efficiency of a GUD-plant. This makes repowering so interesting when the fuel costs as a part of the specific costs of electricity are examined. It depends on the repowering concept and on the part of the gas turbine output, which efficiency can be achieved. There are little differences between the concepts, if the part of the gas turbine is small. With a large gas turbine output reheat steam repowering has thermodynamic advantages. Changes of steam parameters have similar consequences in steam cycles without a gas turbine and in the concepts of repowering. At part load the efficiency of repowered plants are excellent. Depending on the power ratio of the gas turbine at the design point the part load efficiency may even increase. If an older power plant is repowered, one has to take into account the additional mass flow and the higher output of the steammore » turbine.« less
Publication Year: 1998
Publication Date: 1998-07-01
Language: en
Type: article
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Cited By Count: 1
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