核电站辅助给水系统背压调节阀和呼吸阀优化改进设计及运用

Improvement and Application of Back Pressure Control Valve and Breathing Valve for Auxiliary Feedwater System in Nuclear Power Plant

[目的]核电站辅助给水系统(Auxiliary Feedwater System,ASG)储压罐运行中压力通过背压调节阀和呼吸阀的共同作用,稳定在设计压力范围内,如果储罐内压力异常,超压或负压变形,将影响系统正常工作,造成该系统安全功能失效,背压调节阀及呼吸阀性能非常重要。通过对现有问题分析,对背压调节阀和呼吸阀进行改型设计,确保储压罐中压力稳定。[方法]针对实际运行经验,对比目前背压调节阀和呼吸阀结构使用情况,从阀门结构、密封型式等就这两类阀门进行改进设计。[结果]改进后的设备在使用过程中性能稳定,未出现过高压报警等异常现象。[结论]改进后的背压调节阀和呼吸阀大量运用到实际项目中,为后续同类型阀门问题处理提供一定鉴定作用。

[Introduction]The operating pressure of the storage tank of the auxiliary feedwater system(ASG)in nuclear power plant is stabilized within the designed pressure range through the combined action of the back pressure control valve and the breathing valve.Abnormal pressure,overpressure or negative pressure deformation in the storage tank will affect the normal operation of the system and cause the failure of the safety function of the system.The performance of the back pressure control valve and breathing valve is very important.Based on the analysis of the existing problems,the back pressure control valve and breathing valve are improved to ensure the pressure stability of the pressure storage tank.[Method]According to the actual operation experience,the structure of the back pressure control valve and the breathing valve were compared,and the two kinds of valves were improved from the valve structure,sealing type,etc.[Results]The performance of the improved equipment was stable and no abnormal phenomena such as over-high pressure alarm occurred during use.[Conclusion]The improved back pressure control valve and breathing valve have been widely used in practical projects,providing certain identification for the subsequent treatment of similar valve problems.