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以某核电堆型核岛主蒸汽系统为研究对象,研究主蒸汽隔离阀快关引起的汽锤现象。采用PIPENET软件进行建模和计算,给出管系中不同管段的最大载荷及出现时间。结果表明关阀瞬间的载荷最大,并且主蒸汽隔离阀后的载荷比隔离阀前的载荷大,主要是因为隔离阀前设置了卸压装置。同时对卸压装置的开启和流量特性进行了模拟。此外,分析了卸压管线的变化以及主蒸汽管道增加支管的情况对汽锤的影响。以上研究结果可应用于系统设计和管道力学应力计算分析,优化管道的布置,对提高主蒸汽系统和电厂的安全性具有重要的意义。
Taking the main steam system of a nuclear power plant nuclear island as the research object, the hammering phenomenon caused by the quick closing of the main steam isolation valve was studied. The PIPENET software was used to model and calculate the maximum load and the appearance time of different pipe sections in the piping system. The results show that the valve load instantaneous maximum, and the main steam after the isolation valve load than the isolation valve load, mainly because of the isolation valve set pressure relief device. At the same time, the pressure relief device opening and flow characteristics were simulated. In addition, the impact of the pressure relief line changes and the main steam pipe to increase the branch pipe on the hammer. The above results can be applied to the system design and calculation of pipe mechanical stress. Optimizing the pipe layout is of great significance to improve the safety of main steam system and power plant.