Abnormal Opening and Fault Handling of Feed Water Pump Steam Turbine Control Valve of 630MW Unit
This paper introduces the equipment characteristics of NK63/71 feed water pump steam turbine control valve of 630MW unit,takes the No.4 unit of the CHN Energy Ninghai Power Plant as an example to analyze the abnormal opening of low-pressure control valve,the fluctuation of valve position and the resulting hazards in the operation of the 4B feed water pump steam turbine.The dismantling inspection of the equipment shows that the anti-rotating pin dropping of the control valve spindle is the cause of abnormal opening of control valve,and can be solved by repairing the valve core component and reinforcing the anti-rotation pin treatment,which eliminates the potential safety hazards in the operation of feed water pump steam turbine.
low-pressure control valveabnormal openinganti-rotation pinreinforce