Conventional and advanced exergetic analyses applied to a combined cycle power plant
- 作者：Fontina Petrakopoulou ; f.petrakopoulou@iet.tu-berlin.de ; George Tsatsaronis tsatsaronis@iet.tu-berlin.de ; Tatiana Morosuk morozyuk@iet.tu-berlin.de ; Anna Carassai anna_carassai@hotmail.it
- 关键词：Thermodynamic inefficiencies ; Exergy destruction ; Conventional exergetic analysis ; Advanced exergetic analysis ; Combined cycle power plant
- 刊名：Energy
- 出版年：2012
- 期刊代码：11_03605442
- 类别：pw
- 出版时间：May, 2012
- 卷：41
- 期：1
- 页码：146-152
- 文件大小：196 K
摘要
Conventional exergy-based methods pinpoint components and processes with high irreversibilities. However, they lack certain insight. For a given advanced technological state, there is a minimum level of exergy destruction related to technological and/or economic constraints that is unavoidable. Furthermore, in any thermodynamic system, exergy destruction stems from both component interactions (exogenous) and component inefficiencies (endogenous). To overcome the limitations of the conventional analyses and to increase our knowledge about a plant, advanced exergy-based analyses have been developed.
In this paper, a combined cycle power plant is analyzed using both conventional and advanced exergetic analyses. Except for the expander of the gas turbine system and the high-pressure steam turbine, most of the exergy destruction in the plant components is unavoidable. This unavoidable part is constrained by internal technological limitations, i.e. each component鈥檚 endogenous exergy destruction. High levels of endogenous exergy destruction show that component interactions do not contribute significantly to the thermodynamic inefficiencies. In addition, these inefficiencies are unavoidable to a large extent. With the advanced analysis, new improvement strategies are revealed that could not otherwise be found.