冷却水耗功对有机朗肯循环影响的热力学分析

doi:10.3901/JME.2018.18.180

机械工程学报 ›› 2018, Vol. 54 ›› Issue (18): 180-186.doi: 10.3901/JME.2018.18.180

• 可再生能源与工程热物理 • 上一篇下一篇

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冷却水耗功对有机朗肯循环影响的热力学分析

朱轶林¹, 李惟毅¹, 孙冠中²

1. 天津大学中低温热能高效利用教育部重点实验室天津 300350;
2. 中国电力科学研究院北京 100192

收稿日期:2017-05-12 修回日期:2017-11-10 出版日期:2018-09-20 发布日期:2018-09-20
通讯作者: 李惟毅(通信作者),男,1952年出生,教授,博士研究生导师。主要研究方向为低品位余热利用、传热传质、可再生能源利用与节能。E-mail:liwy@tju.edu.cn
作者简介:朱轶林,男,1989年出生,博士研究生。主要研究方向为中低温余热发电、能源与环境工程。E-mail:zhuyilin@tju.edu.cn
基金资助:
国家自然科学基金（51507093）和天津市科技计划（14ZCDGGX00788）资助项目。

Thermodynamic Analysis of an Organic Rankine Cycle with Cooling Water Power Consumption Considered

ZHU Yilin¹, LI Weiyi¹, SUN Guanzhong²

1. Key Laboratory of Efficient Utilization of Low and Medium Grade Energy of Ministry of Education, Tianjin University, Tianjin 300350;
2. China Electric Power Research Institute, Beijing 100192

Received:2017-05-12 Revised:2017-11-10 Online:2018-09-20 Published:2018-09-20

摘要/Abstract

摘要： 由于有机朗肯循环的热效率相对较低，冷凝过程放热量大，冷却水耗功对系统性能的影响较大。研究中考虑冷却水循环，定义水泵耗功比为冷却水耗功与循环功的比值，对有机朗肯循环的系统性能进行热力学分析，研究了冷却水耗功模型中重要参数的影响规律。研究结果表明：提高蒸发温度，水泵耗功比下降；提高冷凝温度，水泵耗功比增大。环境温度为20℃和冷却水初温为25℃时，冷凝器有最小的不可逆损失19.03 kW，系统有最小的不可逆损失为140.32 kW。冷却水温升对水泵耗功比的影响显著，冷却水温升减小，水泵耗功比非线性下降；提高水泵扬程，水泵耗功比线性增大。冷却水温升小于8 K或水泵扬程大于15 m，水泵耗功比大于5%，冷却水耗功对系统净输出功的影响不能忽略。

关键词: ?分析, 净输出功, 冷却水循环, 有机朗肯循环, 余热回收

Abstract: The thermal efficiency of organic Rankine cycle (ORC) is usually low because of the abundant rejection heat rate in the condensation process. Besides, the cooling water power consumption influences the system performance significantly. Considering the cooling water circulation, the ratio for cooling water power consumption is defined as the value of water pump power consumption per power output of the loop, and the effects of important factors have been investigated. The results show that the ratio for cooling water power consumption declines with increasing evaporation temperature, whereas it rises with increasing condensation temperature. With the ambient temperature of 20℃ and the initial temperature for cooling water of 25℃, the expander has the minimum irreversible loss of 19.03 kW and the system has the minimum irreversible loss of 140.32 kW. The influence of temperature rise for cooling water on the ratio for cooling water power consumption is significant. It has a nonlinear fall with decreasing the temperature rise of cooling water, and increases linearly with increasing water pump head. When the temperature rise for cooling water is less than 8 K or the water pump head is more than 15 m, the ratio for cooling water power consumption is larger than 5%, which manifests that the cooling water power consumption cannot be neglected for the ORC system.

Key words: circulating cooling water, exergy analysis, net power output, organic Rankine cycle (ORC), waste heat recovery

中图分类号:

TK123

朱轶林, 李惟毅, 孙冠中. 冷却水耗功对有机朗肯循环影响的热力学分析[J]. 机械工程学报, 2018, 54(18): 180-186.

ZHU Yilin, LI Weiyi, SUN Guanzhong. Thermodynamic Analysis of an Organic Rankine Cycle with Cooling Water Power Consumption Considered[J]. Journal of Mechanical Engineering, 2018, 54(18): 180-186.

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冷却水耗功对有机朗肯循环影响的热力学分析

Thermodynamic Analysis of an Organic Rankine Cycle with Cooling Water Power Consumption Considered

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