知搜-全球专利检索

  1. 登录
  2. 注册

搜索结果

13 条记录 (耗时 0.009 秒)

    Composite studs, pulp mill recovery boiler including composite studs and method for protecting boiler tubes
    11.
    发明授权
    Composite studs, pulp mill recovery boiler including composite studs and method for protecting boiler tubes 失效
    复合螺柱，纸浆回收锅炉，包括复合螺柱和保护锅炉管的方法

    公开(公告)号：US5107798A

    公开(公告)日：1992-04-28

    申请号：US682143

    申请日：1991-04-08

    申请人： Marcio Gerep

    发明人： Marcio Gerep

    IPC分类号： F22B37/10 ,  F28F1/12 ,  F28F19/06

    CPC分类号： F28F1/124 ,  F22B37/106 ,  F23M5/04 ,  F28F19/06

    摘要： Boiler tube studs of composite construction, particularly for protecting waterwall tubes in pulp mill recovery boilers. The studs include an inner solid cylindrical core of a material having thermal conductivity sufficient to provide proper heat transfer to the boiler tubes during operation, and an outer cylindrical sleeve of a material resistant to destructive conditions within a boiler during operation, such as chemical attack and abrasion. The sleeve surrounds the cylindrical surface of the core, but leaves an end surface of the core exposed. The core may be made of low carbon steel, and the sleeve of stainless steel. In order to avoid melting of the stainless steel sleeves when the studs are welded to the tubes, the cylindrical sleeves do not extend all the way to the attachment end such that axial gaps are defined where the sleeves do not cover the cylindrical surfaces of the cores. Compared to standard carbon steel studs, the composite studs have a much longer life before replacement is required, and yet they wear sufficiently for wear patterns to be observed as an indicator of boiler operating conditions. The composite studs maintain a cylindrical configuration as they wear, resulting in improved anchoring of a frozen smelt layer and thus protection of the boiler tubes compared to conventional studs. The composite studs are compatible with conventional studs, in the context of either studs replacement, or replacement of tubes or groups of tubes in panels, and methods of use are disclosed.

    摘要翻译： 锅炉管柱复合结构，特别用于保护纸浆回收锅炉中的水壁管。 螺栓包括具有足以在操作期间向锅炉管提供适当热传递的热导率的材料的内部实心圆柱形芯，以及在操作期间抵抗锅炉内的破坏性条件的材料的外圆柱形套筒，例如化学侵蚀和 磨损。 套筒围绕芯的圆柱形表面，但使芯的端面露出。 芯可以由低碳钢和不锈钢套筒制成。 为了避免当螺柱焊接到管上时不锈钢套管熔化，圆柱形套管不会一直延伸到附接端，使得轴向间隙被限定在套筒不覆盖芯的圆柱形表面的位置 。 与标准碳钢螺栓相比，复合螺柱在需要更换之前具有更长的使用寿命，但是它们充分磨损以作为锅炉运行条件的指标来观察磨损图案。 复合螺柱在磨损时保持圆柱形结构，从而改进了冻结熔融层的锚定，从而与常规螺柱相比保护了锅炉管。 复合螺柱在常规螺柱中是兼容的，在任何螺栓更换或更换管中的管或板组中，公开了使用方法。