核电站高压注射气体隔离阀启动力矩的研究

发布时间：2018-01-17 14:42

本文关键词：核电站高压注射气体隔离阀启动力矩的研究　出处：《华东理工大学》2012年硕士论文　论文类型：学位论文

【摘要】：高压注射气体隔离阀是某类核电站核岛安全保护系统泄压管线的关键设备之一,其作用是在事故状态下及时准确得完成开启,实现管道泄压,对核电站的安全运行起着重要的保护作用。国内某核电站在更换了高压注射气体隔离阀的阀座等易损件后,出现了阀门不能在规定时间内开启的问题,经分析确定了更换的阀座备件导致了阀门的启动力矩过大,进而造成了阀门不能正常开启。据了解,此类阀门及阀座均由国外企业生产,我国核电企业对于此类阀门启动力矩分析方法及阀座对启动力矩影响情况并不明确。本文基于以上背景,以此类高压注射气体隔离阀为研究对象,对阀门的启动力矩和阀座对于启动力矩的影响情况进行了研究,主要研究工作和结果如下： (1)以现有的两类聚甲醛阀座为测试对象,试验测试阀座材料的压缩力学性能、压缩性能时间效应、摩擦性能及摩擦性能的时间效应,对比两类阀座材料性能的差别,并为数值模拟计算提供合适的材料性能参数。试验表明：两类阀座材料的力学性能存在一定差别,并且材料力学性能具有时间效应；两类阀座材料的摩擦性能基本一致,且摩擦性能也存在时间效应。 (2)利用ABAQUS有限元分析软件,模拟计算了阀门在不同密封状态下,球体与阀座之间的接触受力情况及阀门的启动力矩,计算了相关影响因素对启动力矩的影响,最终分析确定了一种启动力矩计算方法。结果表明：阀门的启动力矩随加载时间的延长而增大,其原因是阀座材料力学性能和摩擦性能的时间效应的双重作用；阀座材料性能因素和结构尺寸因素通过影响阀座与球体间的作用力,进而影响阀门的启动力矩；在出口侧阀座密封状态下,阀座结构尺寸因素对启动力矩影响较大,而材料性能因素影响程度有限；在入口侧阀座密封状态下,阀座材料性能因素和结构尺寸因素均对启动力矩有显著影响。 (3)设计开发了阀门模拟试验装置及启动力矩测试方法,通过试验的方式测试分析阀门的启动力矩、预紧位移-预紧力,并验证有限元数值模拟计算的可靠性。试验表明；在恒定载荷下,阀门的启动力矩具有时间效应,启动力矩随加载时间的延长而增大；试验结果与模拟计算的结果吻合度较高,证明了有限元计算的可靠性；本试验装置和试验方法可用于阀座备件的验收评定,具有较高的实用价值。
[Abstract]:High pressure injection gas isolating valve is one of the key equipment of the nuclear island safety protection system in a certain nuclear power plant. Its function is to complete the opening in time and accurately under the accident state to realize the pipeline pressure relief. It plays an important role in protecting the safe operation of the nuclear power station. After replacing the seat of the high-pressure injection gas isolating valve, the valve can not be opened in the specified time. It is determined by analysis that the replacement valve seat spare parts cause the valve to start the torque too big, then caused the valve not to open normally. According to the understanding, this kind of valve and the valve seat are produced by the foreign enterprise. The starting torque analysis method of this kind of valve and the influence of valve seat on the starting torque are not clear in the nuclear power enterprises of our country. Based on the above background, this paper takes this kind of high-pressure injection gas isolating valve as the research object. The effects of valve starting torque and valve seat on starting torque are studied. The main work and results are as follows: 1) taking the existing two kinds of polyformaldehyde valve seats as test objects, the compression mechanical properties, compression time effects, friction properties and time effects of friction properties of seat materials are tested. The difference between the two kinds of seat materials is compared, and suitable material performance parameters are provided for numerical simulation. The test shows that there are some differences in mechanical properties between the two kinds of seat materials. The mechanical properties of materials have time effect. The friction properties of the two types of seat materials are basically the same, and the friction performance also has time effect. 2) the contact force between the ball and the valve seat and the starting moment of the valve are simulated and calculated by using the ABAQUS finite element analysis software under different sealing conditions. The influence of relevant factors on the starting torque is calculated and a method for calculating the starting torque is finally analyzed. The results show that the starting torque of the valve increases with the extension of loading time. The reason is the double effect of time effect of mechanical properties and friction properties of seat materials. The valve seat material performance factor and the structure dimension factor influence the valve starting moment by influencing the force between the valve seat and the ball. Under the condition of outlet side seat seal, the influence of seat structure size on starting torque is greater, while material performance factor is limited. In the entrance side seat seal condition, the material performance factor and the structure dimension factor of the seat have significant influence on the starting moment. Design and development of the valve simulation test device and start torque test method, through the test method of testing and analysis of valve starting torque, pre-tightening displacement-pretightening force. The reliability of finite element numerical simulation is verified. Under constant load, the starting torque of the valve has a time effect, and the starting torque increases with the extension of loading time. The experimental results are in good agreement with the simulated results, which proves the reliability of the finite element method. This test device and test method can be used for the acceptance evaluation of seat spare parts, and have high practical value.
【学位授予单位】：华东理工大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH134

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