Patent ID: 6173680
Filing Date: 2001-01-16
Classification: F22B

Abstract:
A steam generator comprising:(a) an outer jacket of cylindrical overall shape arranged with its axis vertical;(b) a bundle of heat-exchange tubes;(c) a bundle wrapper o f cylindrical overall shape arranged coaxially in side the outer jacket;(d) an annular space delimited between the bundle wrapper and one of the outer jacket and a guide skirt coaxial with the outer jacket in which the feedwater for the steam generator can flow in the axial direction;(e) a feedwater supply device at an upper axial end of the annular space, said feedwater supply device comprising:(i) a manifold having a first jacket in an overall shape of the closed torus arranged along at least part of a circumference of the annular space and having an upper wall comprising a plurality of flow openings distributed in a circumferential direction of the manifold;(ii) at least one feeding pipe for feeding the manifold passing through the outer jacket; and(f) means for guiding the feedwater downwards towards the annular space comprising:(i) a second jacket arranged around at least part of said first jacket of the manifold delimiting with said first jacket of the manifold a water flow space in which the feedwater can flow;(ii) at least one guide wall extending said second jacket downwards; and(iii) a plurality of radially-oriented dividing walls dividing the waterflow space into a number of sections succeeding on another in a circumferential direction of said first jacket of the manifold.