| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat transfer tube support structure capable of preventing deterioration of reliability and durability of a heat transfer tube. SOLUTION: In a steam generator (a heat exchanger) having a lower part drum (a vessel), the heat transfer tubes 13 provided in the lower part drum, and tube support plates 25 provided in the lower part drum and opened with heat transfer tube insertion holes 26 in a thickness direction, support parts 27 receiving the heat transfer tubes 13 are provided in axial middle parts of the heat transfer tube insertion holes 26 in an inner face of the heat transfer tube insertion holes 26, and an area between the support part 27 and each opening end of the heat transfer tube insertion holes 26 is an inclined plane 28 heading toward radial outer sides of the heat transfer tube insertion holes 26 as each approaches an opening end side. COPYRIGHT: (C)2008,JPO&INPIT |
