三偏心快关阀的液压系统设计与动态特性仿真

大型三偏心蝶阀作为紧急切断系统逐步推广应用到燃气发电机组进气保安系统中,其液压控制系统的动态响应特性及可靠性对电站安全运行至关重要。针对三偏心蝶阀作为紧急切断阀系统的功能要求,设计出满足紧急切断要求的液压控制方案。建立液压控制系统的仿真模型,对开阀及关阀过程进行系统的动态特性仿真,并对研制的紧急切断阀系统的动态响应进行了试验,全开过程中执行机构活塞实测最大位移比仿真结果大0.2mm,快关阀全开和紧急关闭实测最长时间都比仿真结果多0.01s。证明在设计过程中采用仿真技术能够准确地预测设计的三偏心蝶阀系统的动态响应特性和优化设计方案。

Design of a Hydraulic System for a Three-eccentricity Quick Closing Valve and Simulation of its Dynamic Characteristics

As an equipment item in the emergency trip system,a large-sized three-eccentricity butterfly valve has gradually found its use in the steam turbine security system of thermal and nuclear power plants.The dynamic response characteristics and reliability of its hydraulic control system are vital to the safe operation of a power plant.In the light of the functional need of the three-eccentricity butterfly valve as an equipment item in the emergency shutoff valve system,a hydraulic control version meeting the requirement of an emergency trip has been designed.A simulation model of the hydraulic control system has been set up.The simulation of systematic dynamic characteristics during the valve opening and closing process was conducted and the full-dynamic response of the developed emergency shutoff valve system tested.During the opening process of the valve,the maximal displacement of the actuator piston being measured was 0.2 mm greater than that of the simulation result and the longest time measured for the quick shutoff valve for both "full open" and emergency shutoff was without exception 0.01 s longer than that of the simulation result.The foregoing shows that the adoption of simulation technology during the design process can accurately forecast the dynamic response characteristics of the designed three-eccentricity butterfly valve system and also its optimized design versions.