摘要
为解决低油温状态下启动EH油泵时中压主汽门异常开启的问题,分析了中压主汽门油动机模块自动停机开关单向阀和卸荷阀、超速保护限制和自动停机开关模块补油节流孔、有压回油滤网、安全油管道、油系统、中压主汽门碟片等部件的工作状态,并进行了一系列的试验和判断。通过将左、右侧中压主汽门碟片弹簧开启力由0.85 MPa调整到1.9 MPa,彻底解决了中压主汽门异常开启问题。研究结果表明,选择合适的碟片弹簧开启力,可以消除EH油温低、油黏稠度大和调速系统背压偏高等情况对主汽门状态的影响。分析处理方案可以为同类型机组调速系统类似问题的处理提供参考。
The intermediate pressure main valves of a steam turbine opened abnormally when the EH oil pump was started at low temperature.To solve the problem,analysis was carried out respecting the working states of the automatic shutdown switch check valve and unloading valve of the intermediate pressure main valve oil motor module,the fill oil orifice of over speed protection limit and automatic shutdown switch module,oil filter with pressure return,safety oil pipeline,the oil system,disc of intermediate pressure main valve,etc.Accordingly,a series of tests and investigations were made.By adjusting the disc spring opening force of the left and right intermediate pressure main valves from 0.85 MPa to 1.9 MPa,the abnormal opening problem of the intermediate pressure main valves was thoroughly solved.The research results showed that to set the opening force of the disc spring properly could eliminate the influence of low EH oil temperature,large oil viscosity and high back pressure of speed control system on the main valve.The analysis and treatment scheme can provide reference for solving similar problems in speed control system of the same type of units.
作者
马忠南
静锴
孔晓明
谢孟坤
MA Zhongnan;JING Kai;KONG Xiaoming;XIE Mengkun(Huaneng(Dalian)Thermal Power Co.,Ltd.,Dalian 116031,China)
出处
《热力透平》
2024年第4期300-304,共5页
Thermal Turbine
关键词
主汽门
调速系统
异常开启
碟片弹簧力
main valve
speed control system
abnormal opening
disc spring force
