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Chin. Phys. B, 2014, Vol. 23(5): 050513    DOI: 10.1088/1674-1056/23/5/050513
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Output power analyses for the thermodynamic cycles of thermal power plants

Sun Chen (孙晨), Cheng Xue-Tao (程雪涛), Liang Xin-Gang (梁新刚)
Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China
Abstract  Thermal power plant is one of the important thermodynamic devices, which is very common in all kinds of power generation systems. In this paper, we use a new concept, entransy loss, as well as exergy destruction, to analyze the single reheating Rankine cycle unit and the single stage steam extraction regenerative Rankine cycle unit in power plants. This is the first time that the concept of entransy loss is applied to the analysis of the power plant Rankine cycles with reheating and steam extraction regeneration. In order to obtain the maximum output power, the operating conditions under variant vapor mass flow rates are optimized numerically, as well as the combustion temperatures and the off-design flow rates of the flue gas. The relationship between the output power and the exergy destruction rate and that between the output power and the entransy loss rate are discussed. It is found that both the minimum exergy destruction rate and the maximum entransy loss rate lead to the maximum output power when the combustion temperature and heat capacity flow rate of the flue gas are prescribed. Unlike the minimum exergy destruction rate, the maximum entransy loss rate is related to the maximum output power when the highest temperature and heat capacity flow rate of the flue gas are not prescribed.
Keywords:  thermal power plants      Rankine circle      exergy destruction      entransy loss  
Received:  31 July 2013      Revised:  03 November 2013      Accepted manuscript online: 
PACS:  05.70.-a (Thermodynamics)  
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 51376101).
Corresponding Authors:  Liang Xin-Gang     E-mail:  liangxg@tsinghua.edu.cn
About author:  05.70.-a

Cite this article: 

Sun Chen (孙晨), Cheng Xue-Tao (程雪涛), Liang Xin-Gang (梁新刚) Output power analyses for the thermodynamic cycles of thermal power plants 2014 Chin. Phys. B 23 050513

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