Tube support plate of steam generator

Abstract

The present invention aims to decrease a pressure loss in a tube support plate 200 disposed in a steam generator, and ensure sufficient strength. The tube support plate 200 has many through-holes 100 formed therein for passage of heat transfer tubes 210 . The shape of the through-hole 100 is a hexagonal shape. Protrusions 100 a , 100 b , 100 c are formed in alternate sides 102, 104, 106 among the sides constituting the hexagonal shape. The arrangement of the through-holes 100 is a so-called honeycomb arrangement. Thus, the opening area of the through-hole 100 can be rendered large to decrease a pressure loss, and the strength of the tube support plate can be ensured.

1 . A tube support plate of a steam generator, which is disposed within the steam generator and has many through-holes formed therein for passage of heat transfer tubes, characterized in that
 a hole shape of the through-hole is a hexagonal shape, and every other side of sides forming the hexagonal shape has a protrusion formed therein, the protrusion protruding toward a center of the through-hole, and   an arrangement of the through-holes is such that many horizontal rows of the through-holes are arranged in parallel, each horizontal row including the through-holes arranged in a straight line with a constant pitch, and that positions of the through-holes arranged in each horizontal row of the through-holes are shifted by a half of the pitch from corresponding positions of the through-holes arranged in the adjacent horizontal row of the through-holes.   
     
     
         2 . The tube support plate of a steam generator according to  claim 1 , characterized in that end portions of the sides are curved.