Power Generation Technology ›› 2024, Vol. 45 ›› Issue (6): 1074-1086.DOI: 10.12096/j.2096-4528.pgt.24170

• Power Generation and Environmental Protection • Previous Articles    

Research and Application of Operation Flexibility Improvement Technology for Coal-Fired Power Unit

Xinrong YAN1,2, Zhiyong HU2, Pengwei ZHANG2, Chenghang ZHENG1, Jun XIANG3, Guo’an TANG2, Jinliang LIU2, Jianxiong GUO2, Yibo HUANG2, Pengfeng YU2, Xiang GAO1   

  1. 1.College of Energy Engineering, Zhejiang University, Hangzhou 310007, Zhejiang Province, China
    2.Huadian Electric Power Research Institute Co. , Ltd. , Hangzhou 310030, Zhejiang Province, China
    3.State Key Laboratory of Coal Combustion (Huazhong University of Science and Technology), Wuhan 430074, Hubei Province, China
  • Received:2024-08-06 Revised:2024-09-26 Published:2024-12-31 Online:2024-12-30
  • Supported by:
    National Key R&D Program of China(2022YFB4100800)

Abstract:

Objectives Under the background of the “dual carbon” strategic goal, the demand for flexible regulation resources in the power system has significantly increased after the large-scale integration of new energy generation into the grid. At present, the coal-fired power is the main flexible resource on the power side with the ability to scale up peak shaving. Since 2016, the major domestic power generation companies have implemented a certain scale of flexibility transformation of coal-fired power units. Therefore, it is necessary to summarize and analyze the problems existing in the actual operation and maintenance of the unit after flexibility transformation. Methods The technical route, investment cost and actual operation of several coal-fired power units with flexible transformation in a company were statistically analyzed. Results After the flexibility improvement and transformation of the active coal-fired power generation unit, the minimum power generation output of the advanced unit can be reduced to 18%Pe (Pe is rated load) level, the load change rate with 20%Pe~30%Pe can reach 1.8%Pe/min, and an average unit capacity investment is 101 yuan/kW. In addition, under flexible operating conditions, the coal consumption of coal-fired power units after the transformation has significantly increased. Conclusions Suggestions are put forward for the operation, maintenance and further work of coal-fired power units under flexible operating conditions. The research results provide reference and inspiration for the flexibility improvement and transformation of existing coal-fired power units.

Key words: dual carbon, coal-fired power unit, low load, deep peak regulation, flexibility transformation, technical route, investment, maintenance suggestions

CLC Number: