摘要
某新建1000MW发电机组高压加热器系统采用常规单列布置,设置1号、2号、3号三台高压加热器,另设置一台调整抽汽专用的0号高压加热器。因三级抽汽过热度较高,额外设置一台外置蒸汽冷却器以降低其过热度,进而提高给水温度。机组投产以后,多次因3号高压加热器汽侧水位突升触发保护跳闸。经分析发现,当机组负荷升高时,蒸汽冷却器事故疏水管道水封功能失效,导致管道内积水快速涌入3号高压加热器,引发3号水位突升而触发水位保护动作。针对此情况提出改造措施,改造后蒸汽冷却器事故疏水管道水封功能恢复正常,未再发生类似高加解列事件,提高了3号高压加热器及蒸汽冷却器换热效率,也提高机组运行稳定性。
The high-pressure heater system of a newly constructed 1000MW unit adopts a single-row layout,with three conventional high-pressure heaters(Nos.1,2,and 3)and an additional No.0 high-pressure heater dedicated to adjusting steam extraction.Due to the high superheat of the third-stage steam extraction,an external steam cooler is installed to reduce the superheat and thereby increase the feedwater temperature.After the unit was commissioned,multiple protection trips were triggered due to sudden increases in the steam side water level of the No.3 high-pressure heater.Analysis revealed that when the unit load increased,the water seal function of the accident drain pipe of the steam cooler failed,causing accumulated water in the pipe to rapidly flow into the No.3 high-pressure heater,triggering the water level protection action due to the sudden increase in water level.In response to this situation,renovation measures were proposed.After the renovation,the water seal function of the accident drain pipe of the steam cooler was restored to normal,and no similar high-pressure heater tripping incidents occurred.The heat exchange efficiency of the No.3 high-pressure heater and steam cooleras well as the operational stability of the uniwereimproved.
作者
田向锋
陈豪
吴瑞康
TIAN Xiangfeng;CHEN Hao;WU Ruikang(Zhejiang Zheneng Yueqing Power Generation Co.,Ltd.,Wenzhou 325609,China;Electric Power Research Institute of State Grid Zhejiang Electric Power Co.,Ltd.,Hangzhou 310014,China)
出处
《能源工程》
2025年第4期108-115,共8页
Energy Engineering
关键词
1000MW
高加解列
外置蒸汽冷却器
水封
给水温度
1000MW
high-pressure heater disconnection
external steam cooler
water seal
feedwater temperature
