Advanced Thermodynamic Analysis and Evaluation of a Supercritical Power Plant

Ligang Wang, Yongping Yang, Tatiana Morosuk and George Tsatsaronis
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Ligang Wang: Institute for Advanced Energy System, North China Electric Power University, Beinong Road 2, Beijing 102206, China
Yongping Yang: Institute for Advanced Energy System, North China Electric Power University, Beinong Road 2, Beijing 102206, China
Tatiana Morosuk: Institut für Energietechnik, Technische Universität Berlin, Marchstr. 18, Berlin 10587, Germany
George Tsatsaronis: Institut für Energietechnik, Technische Universität Berlin, Marchstr. 18, Berlin 10587, Germany

Energies, 2012, vol. 5, issue 6, 1-14

Abstract: A conventional exergy analysis can highlight the main components having high thermodynamic inefficiencies, but cannot consider the interactions among components or the true potential for the improvement of each component. By splitting the exergy destruction into endogenous/exogenous and avoidable/unavoidable parts, the advanced exergy analysis is capable of providing additional information to conventional exergy analysis for improving the design and operation of energy conversion systems. This paper presents the application of both a conventional and an advanced exergy analysis to a supercritical coal-fired power plant. The results show that the ratio of exogenous exergy destruction differs quite a lot from component to component. In general, almost 90% of the total exergy destruction within turbines comes from their endogenous parts, while that of feedwater preheaters contributes more or less 70% to their total exergy destruction. Moreover, the boiler subsystem is proven to have a large amount of exergy destruction caused by the irreversibilities within the remaining components of the overall system. It is also found that the boiler subsystem still has the largest avoidable exergy destruction; however, the enhancement efforts should focus not only on its inherent irreversibilities but also on the inefficiencies within the remaining components. A large part of the avoidable exergy destruction within feedwater preheaters is exogenous; while that of the remaining components is mostly endogenous indicating that the improvements mainly depend on advances in design and operation of the component itself.

Keywords: supercritical power plant; advanced exergy analysis; improvement strategy (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2012
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (30)

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