steam generator refrigerant communication tube with u-shaped tubes of a horizontal heat exchange beam and methods of its manufacture

摘要

This invention relates to the electric power industry, and may be used in horizontal steam generators for nuclear power plants (npp) with a water-to-water energy reactor (vver). A U-shaped steam generator primary circuit refrigerant communication pipe with a horizontal heat exchange beam designed as a thick-wall welded vessel with a perforated central cylindrical portion designed to permit the installation affixing a bundle of U-shaped heat exchange tubes therein, where the tubes are grouped into benches and separated by vertical intertubular tunnels, a lower cylindrical part designed to allow welded connection to the connecting pipe steam generator vessel, and an upper cylindrical portion with a tapered adapter to the manhole flange connection with cap, where the outer diameter of dhead primary circuit communication pipe in the center is selected based on the following ratio :, · V + 100 = d = 2 · 2 · v2 · - 1 · + · - head v · + · - · + 100 where: sh is the spacing between heat exchange tubes in the horizontal heat exchange beam row, mm, 2 is the width of the heat exchange beam tunnel to the refrigerant communication pipe, mm, d is the diameter of the external heat exchange pipe, mm, n1 and n2 indicate the number of tubes in the horizontal row of the smaller and larger heat exchange tube banks, accordingly, mm, r¿ is the minimum bias radius of the 2/2 heat exchange beam tubes, mm. the holes for affixing the heat exchange tubes are staggered in the central cylindrical part of the communication tube so that the distance between edges of the adjacent holes is not less than 5.5 mm along the inner surface of the communication tube. The technical result of the invention involves guaranteeing the strength of the communication tube wall bridges between holes for affixing heat exchange tubes and the tightness of the heat exchange tube connections with the communication tube assuming that the outer surface of the Perforated communication tube is most effectively (completely) used for tubing.