Reliability Improvement and Control Logic Optimization of Energy Storage Hydraulic Control Butterfly Valve in Thermal Power Plants
Hydraulic control butterfly valve plays an important role in water-cooled thermal power generation units.As an important control device of the unit's circulating water system,once the butterfly valve loses control,it will cause low vacuum protection action of the unit and trip the unit.This paper addresses some issues with embedded pressure relays in hydraulic control butterfly valve oil station,such as the cumbersome online calibration process,the need to stop the standby circulation pump during calibration,difficulty in detecting drift in the fixed value,and the risk of butterfly valve refusal to act.By improving the sampling method of the pressure switch and based on this,a redundant control circuit for oil pump start stop is proposed to improve the reliability of hydraulic control butterfly valve equipment.A new logic judgment method for butterfly valve full close signal is designed to avoid the possibility of butterfly valve refusal to act caused by vibration.By improving the sampling method and optimizing the control logic,the stability of the hydraulic control butterfly valve has been enhanced,effectively ensuring the reliability of the circulating water system.
hydraulic control butterfly valvepressure relaycontrol circuitlogic optimization
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