Output power analyses for the thermodynamic cycles of thermal power plants

doi:10.1088/1674-1056/23/5/050513

中国物理B ›› 2014, Vol. 23 ›› Issue (5): 50513-050513.doi: 10.1088/1674-1056/23/5/050513

Output power analyses for the thermodynamic cycles of thermal power plants

孙晨, 程雪涛, 梁新刚

Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China

收稿日期:2013-07-31 修回日期:2013-11-03 出版日期:2014-05-15 发布日期:2014-05-15
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 51376101).

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

Received:2013-07-31 Revised:2013-11-03 Online:2014-05-15 Published:2014-05-15
Contact: Liang Xin-Gang E-mail:liangxg@tsinghua.edu.cn
About author:05.70.-a
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 51376101).

摘要/Abstract

摘要： 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.

关键词: thermal power plants, Rankine circle, exergy destruction, entransy loss

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.

Key words: thermal power plants, Rankine circle, exergy destruction, entransy loss

中图分类号: (Thermodynamics)

05.70.-a

孙晨, 程雪涛, 梁新刚. Output power analyses for the thermodynamic cycles of thermal power plants[J]. 中国物理B, 2014, 23(5): 50513-050513.

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[J]. Chin. Phys. B, 2014, 23(5): 50513-050513.

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Output power analyses for the thermodynamic cycles of thermal power plants

Output power analyses for the thermodynamic cycles of thermal power plants

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