Analysis of the Reasons for Insufficient Output of an Ultra-supercritical Unit

2019 5th International Conference on Energy Materials and Environment Engineering

能源学;生态环境科学

Lu, Jin^1^2 ; L.G., Chen ; W., Chen ; Z., Liu ; B., Yan ; Z.-H., Wan

State Grid JiangXi Electric Power Research Institute, Nanchang, Jiangxi Province

330096, China^1

Nanchang Kechen Power Test Research Co., Ltd., Nanchang, Jiangxi Province

330096, China^2

关键词: Condensing steam turbine;    Flow area;    High-pressure cylinders;    Historical data;    Nameplate capacity;    Supercritical steam turbines;    Supercritical units;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/295/4/042092/pdf
DOI  :  10.1088/1755-1315/295/4/042092

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

An ultra-supercritical steam turbine unit is N660-25/600/600 type intermediate reheat, single-shaft, three-cylinder four-row steam and double-pressure condensing steam turbine manufactured by Dongfang Steam Turbine Co., Ltd. Through relevant certification, the nameplate capacity of the unit was expanded to 700MW. Since the winter of this year, the unit has had insufficient output. According to the historical data of the site, the reasons for the insufficient output of the unit were analyzed. The diagnosis conclusion is that the reduction of the flow area of the high-pressure cylinder is the main reason for the limited output of the unit.