| 摘要 |
PURPOSE:To effectively prevent a heat transfer pipe from being demaged due to the thermal deformation of a tube bundle support structure by forming a large tapered portion extending outwardly at least one of outer end edges of a tube hole of a tube bundle support plate located at a position farthest from the tube plate, and setting the length of the parallel portion of the tube hole shorter than the length of the prallel part of the tube hole of another tube bundle support plate. CONSTITUTION:Chamfering 30a of a minute radius is carried out at one of outer end edges on one side of a tube hole 30 of a tube bundle support plate 25a located at a position farthest from a tube plate, in a manner similar to another tube bundle support plate. The length of the parallel portion 30c of the tube hole 30 is made shorter than that of another tube bundle support plate. Although the tube bundle support plate is inclined by the difference in the temperatures between the lower part of the tube bundle and the upper part thereof, the inclination is not hindered by a heat transfer tube 17 until the tube bundle support plate is considerably largely inclined by the tapered portion 30b. In this manner, the suppression of the thermal expansion of the heat transfer tube by the final tube bundle support plate is prevented. |
