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在槽式直接产蒸汽(directsteam generation,DSG)太阳能热发电系统中,传统接收器的密封装置存在结构复杂、造价昂贵等问题。为解决这些问题,研制了新型法兰机械密封结构,详细介绍了该密封装置的结构。为分析此密封结构的可靠性,利用有限元分析软件ABAQUS的热-力耦合功能,对工作过程中法兰盖板的温度场和应力场进行了数值模拟。分析结果表明,最大的应力变化出现在法兰盖板中心的热影响区,对盖板表面裂纹有主要的影响,最大应力小于材料的许用应力235MPa。
In the slotted direct steam generation (DSG) solar thermal power generation system, the conventional receiver sealing device has the problems of complex structure and high cost. In order to solve these problems, a new flange mechanical seal structure has been developed and the structure of the seal has been introduced in detail. In order to analyze the reliability of this seal structure, the temperature and stress fields of the flange cover during the working process are numerically simulated by using the thermo-mechanical coupling function of the finite element analysis software ABAQUS. The analysis results show that the maximum stress change appears in the heat affected zone in the center of the flange cover, which has a major impact on the surface crack of the cover. The maximum stress is less than the allowable stress of the material 235MPa.