Patent ID: 7370694

Claim:
A condenser which houses a tube bundle formed by arranging a number of condenser tubes in a condenser shell isolated from an outside, and allows a circulating medium to flow through the condenser tubes to condense a steam turbine exhaust introduced into the condenser shell at an outer surface of the condenser tubes, wherein the tube bundle comprises an upper tube bundle and a lower tube bundle arranged below the upper tube bundle, and wherein the tube bundle is constructed so that the circulating medium flows in the condenser tubes in the upper tube bundle and in the condenser tubes in the lower tube bundle in inverse directions respectively as a two-path turning-back type structure, the condenser comprising: a noncondensing air ejection duct provided only in one tube bundle positioned at an upstream side in a flowing direction of the circulating medium, of the upper tube bundle and the lower tube bundle, and provided at an approximately center of a width direction in a vertical section of the tube bundle; and steam flow prevention plates of which upper and lower ends reach the upper tube bundle and the lower tube bundle provided at a portion in which the condenser tubes are not arranged between the upper tube bundle and the lower tube bundle, to be positioned at both right and left sides of the noncondensing air ejection duct, wherein said stream flow prevention plate is arranged at a position, when each width of the tube bundle at both right and left sides of said noncondensing air ejection duct is denoted by “L”, and when a distance from an outer side of the tube bundle to said steam flow prevention plate is denoted by “1”, in the vertical section to the longitudinal direction of said tube bundle, to be defined by 0.3≦1/L≦0.7.