高温高压实验用特种阀门的热应力分析

Thermal stress analysis of a special valve used in high-temperature and high-pressure experiment

为了适应大型水流体-固体相互作用实验装置超高温(600℃)、超高压(100 MPa)的极端工作环境,保证阀门安全有效,以高温高压截止阀为研究对象,通过SolidWorks设计建立三维有限元模型,运用Ansys软件分析该阀门在实际工况下的温度和应力分布。选取4种材料对比分析热传导系数、热膨胀系数、弹性模量对温度和应力分布的影响。对阀门的密封结构和性能进行说明讨论。研究认为,选用镍基合金材料作为制作材料,阀门能够在高温环境下保持足够强度,并且满足实验装置的超高温、超高压工作环境的使用要求。在一定范围内,阀门温度和应力随热传导系数和热膨胀系数的降低以及弹性模量的增大而减小。

In order to adapt the extreme work environment for the experimental system of hydrothermal fluid and solid interaction at high-temperature(600℃)and high-pressure(100 MPa)and to ensure safe and effective of the valve,taking the HTHP cut-off valve as a researching subject,we have designed and established 3 D finite element model using the SolidWorks,and analyzed the temperature and stress distributions of this valve in actual working state using the Ansys software.4 kinds of materials were selected for comparative analyzing the influences of the thermal conductivity coefficient,thermal expansion coefficient,and elasticity modulus on the temperature and stress distributions of those materials.The sealing structure and performance of valves at operation condition have been discussed.The results show that valve made with the selected nickel-based alloy material can maintain the enough strength at high temperature to satisfy the demand of experimental device working in the ultrahigh temperature and ultrahigh pressure environment.In a certain range,the temperature and stress of the valve are decreased along with the decrease of thermal conductivity coefficient and thermal expansion coefficient but the increase of elasticity modulus.