SUPPORT PLATE FOR U-SHAPED HEAT TRANSFER TUBE OF STEAM GENERATOR OF NUCLEAR POWER PLANT AND STEAM GENERATOR THEREOF

摘要

A support plate for a U-shaped heat transfer tube of a steam generator of a nuclear power plant, comprising a plate body (10). The plate body (10) is opened thereon with a plurality of three-leaf plum blossom-shaped holes (12) that penetrate the plate body (10). A hole bridge (14) is formed between two adjacent three-leaf plum blossom-shaped holes (12). The three-leaf plum blossom-shaped holes (12) comprise boss edges (120), side edges (122) and top edges (124). After U-shaped heat transfer tubes (16) are inserted into the three-leaf plum blossom-shaped holes (12), the boss edges (120) support tube walls of the U-shaped heat transfer tubes (16). The side edges (122) and the top edges (124) of the three-leaf plum blossom-shaped holes (12) and the tube walls of the U-shaped heat transfer tubes (16) enclose heat exchange fluid passages (18) at outer sides of the U-shaped heat transfer tubes (16). A tube gallery area (19) is formed at a middle portion of the plate body (10), the tube gallery area (19) is opened with a through hole (190), and the three-leaf plum blossom-shaped holes (12) are disposed at two sides of the tube gallery area (19), wherein the included angle of connection lines of centers of the three-leaf plum blossom-shaped holes (12) and side edges (122) corresponding thereto is α, and 0 α≤ 13°. The support plate makes the U-shaped heat transfer tubes (16) more compactly arranged, and more U-shaped heat transfer tubes (16) may be arranged on the same area, such that the overall size and cost of the device may be reduced. The three-leaf plum blossom-shaped holes (12) have large heat exchange fluid flow areas, ensuring the structural continuity and strength at the weakest part of the hole bridges (14) of the support plate.