Research and Application of Operation Flexibility Improvement Technology for Coal-Fired Power Unit
[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.
dual carboncoal-fired power unitlow loaddeep peak regulationflexibility transformationtechnical routeinvestmentmaintenance suggestions