发电技术 ›› 2025, Vol. 46 ›› Issue (4): 818-828.DOI: 10.12096/j.2096-4528.pgt.25092

• 发电及环境保护 • 上一篇    下一篇

核电厂低品位余热发电技术研究

赵雅卓1, 张文杰1, 廖颖慧2,3, 林晋磊2,3, 张荣勇1, 段远源2,3   

  1. 1.中国核电工程有限公司,北京市 海淀区 100037
    2.热科学与动力工程教育部重点实验室(清华大学),北京市 海淀区 100084
    3.二氧化碳资源利用与减排技术北京市重点实验室(清华大学),北京市 海淀区 100084
  • 收稿日期:2025-02-17 修回日期:2025-04-05 出版日期:2025-08-31 发布日期:2025-08-21
  • 作者简介:赵雅卓(1995),女,硕士,助理工程师,研究方向为核电水工设计与科研,zhaoyz@cnpe.cc
    张文杰(1988),女,硕士,高级工程师,研究方向为核电水工设计与科研,zhangwjc@cnpe.cc
    廖颖慧(2000),女,博士研究生,研究方向为中低温热能利用、热力系统优化等,Liao-yh23@mails.tsinghua.edu.cn
    林晋磊(2001),男,硕士研究生,研究方向为中低温热能利用、热力系统优化等,linjl24@mails.tsinghua.edu.cn
    张荣勇(1977),男,硕士,研究员级高级工程师,研究方向为核电水工设计与科研,zhangryc@cnpe.cc
    段远源(1971),男,博士,教授,研究方向为热力学、流体的热物理性质、中低温热能利用等,本文通信作者,yyduan@mail.tsinghua.edu.cn
  • 基金资助:
    国家自然科学基金项目(52106017);中国核电工程有限公司自主立项科研项目(KY23076)

Research on Power Generation Technologies for Low-Grade Waste Heat in Nuclear Power Plants

Yazhuo ZHAO1, Wenjie ZHANG1, Yinghui LIAO2,3, Jinlei LIN2,3, Rongyong ZHANG1, Yuanyuan DUAN2,3   

  1. 1.China Nuclear Power Engineering Co. , Ltd. , Haidian District, Beijing 100037, China
    2.Key Laboratory for Thermal Science and Power Engineering of Ministry of Education (Tsinghua University), Haidian District, Beijing 100084, China
    3.Beijing Key Laboratory for CO2 Utilization and Reduction Technology (Tsinghua University), Haidian District, Beijing 100084, China
  • Received:2025-02-17 Revised:2025-04-05 Published:2025-08-31 Online:2025-08-21
  • Supported by:
    National Natural Science Foundation of China(52106017);Independent Research Project of China Nuclear Power Engineering Co., Ltd(KY23076)

摘要:

目的 针对核电厂低品位余热直接排放造成的海洋热污染问题,亟需探索高效解决方案以降低排海热负荷。为此,对不同类型余热源特性及其发电潜力进行了系统评估,为核电厂余热利用提供热经济性数据依据。 方法 总结了核电厂中各类低品位余热的特点,并分析了余热的不同利用方式及其发展现状;介绍了3种适用于该余热的发电技术,并结合实际案例对比分析了不同发电技术的热经济性能及不同余热源的回收潜力。 结果 核电厂二回路凝结饱和水的能质系数最高,发电利用潜力最大。此外,有机朗肯循环(organic Rankine cycle,ORC)是热经济性能最佳的余热发电方案,其平准化度电成本最低,为0.037 6美元/(kW⋅h),相对于喷射式有机闪蒸循环和卡琳娜循环分别降低了84%和78%;ORC发电功率为462.2 kW,具有较好的可行性;在回收低压缸乏汽余热场景下,ORC的可减排热负荷为360.3 MW,环保效益显著。 结论 ORC等余热发电技术可大幅降低排海热负荷,为我国核电厂的低品位余热利用与降低排海热负荷提供重要参考。

关键词: 核电, 余热发电, 热污染防治, 低品位余热回收, 有机朗肯循环(ORC), 喷射式有机闪蒸循环(EOFC), 卡琳娜循环(KC), 热经济可行性分析

Abstract:

Objectives To address the issue of marine thermal pollution caused by the direct discharge of low-grade waste heat from nuclear power plants, it is imperative to explore efficient solutions to reduce thermal discharge loads. Therefore, by the characteristics of different types of waste heat sources and their potential of power generation are systematically evaluating to provide thermo-economic data basis for waste heat utilization in nuclear power plants. Methods The characteristics of different types of low-grade waste heat in nuclear power plants are summarized, and different utilization methods of waste heat and their current development status are analyzed. Three types of power generation technologies suitable for this waste heat are introduced, and their thermo-economic performance and the recovery potential of different waste heat sources are comparatively analyzed through actual case studies. Results The energy quality coefficient of the secondary loop condensate saturated water in nuclear power plants is the highest, showing the greatest potential for power generation utilization. Moreover, the organic Rankine cycle (ORC) demonstrates optimal thermo-economic performance as a waste heat power generation solution, achieving the lowest levelized cost of electricity at $0.037 6/(kW⋅h), which is 84% and 78% lower than that of the ejector organic flash cycle and the Kalina cycle, respectively. ORC achieves a generation capacity of 462.2 kW, demonstrating good feasibility. In the scenario of recovering waste heat from the low-pressure turbine exhaust, the ORC can reduce thermal discharge by 360.3 MW, showing significant environmental benefits. Conclusions Waste heat power generation technologies such as the ORC can significantly reduce thermal discharge loads into the sea, providing important references for low-grade waste heat utilization and thermal pollution reduction in China’s nuclear power plants.

Key words: nuclear power, waste heat power generation, thermal pollution prevention and control, low-grade waste heat recovery, organic Rankine cycle (ORC), ejector organic flash cycle (EOFC), Kalina cycle (KC), thermo-economic feasibility analysis

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