摘要
针对某57 MW背压式汽轮机调门严密性试验后发生的动静碰磨事件,对汽轮机的结构和运行参数进行分析,建立汽轮机转子及缸体的轴向膨胀简化模型,并进行校核计算。结果表明:带负荷运行过程中座缸阀未正常开启,且调门严密性试验后负荷快速下降,高压缸负胀差超限,并造成第1—3级高压动静叶汽封间隙发生碰磨。调门严密性试验中,当该机组排汽背压为大气压时,最低转速不大于1 200 r/min,符合制造厂标准,严密性试验合格。
After regulating valves leaking test of a 57 MW back-pressure steam turbine,friction between rotating and static parts occurred. The paper analyzes the structure of steam turbine and the operational parameters and establishes a simplified model of axial expansion of rotor and cylinder and conducts verification calculation. The results show that the cylinder valve has not opened normally during on-load operation,and the load drops sharply after the regulating valves leaking test causes the expansion difference overlimit of the high-pressure cylinder,which leads to the friction between the steam seal clearances of rotating and static blades of stages 1,2 and 3. And when the back pressure of the exhaust amounts to atmospheric pressure,the minimum rotating speed will not be higher than 1 200 r/min,which complies with the factory standard and the tightness test is up to standard.
作者
章鹏
杨振华
滕千里
马振方
ZHANG Peng;YANG Zhenhua;TENG Qianli;MA Zhenfang(E Energy Technology Co.,Ltd.,Hangzhou 310012,China)
出处
《浙江电力》
2022年第3期106-110,共5页
Zhejiang Electric Power
关键词
背压式汽轮机
动静碰磨
严密性试验
胀差
back-pressure steam turbine
friction between rotating and static parts
tightness test
expansion difference
