Axial flow steam generator feedwater dispersion apparatus

A steam generator comprising:

• a primary side including:
• an inlet chamber for receiving a heated primary fluid;
• an outlet chamber for returning the primary fluid to a heating source;
• a tube sheet forming at least one wall of the inlet chamber and at least one wall of an outlet chamber;
• a plurality of heat exchange tubes respectively having first and second ends and an intermediate extent, with the first ends extending through the tube sheet and opening into the inlet chamber and the second ends extending through the tube sheet and opening into the outlet chamber with the intermediate extent passing through and in heat exchange relationship with a secondary side;
• the secondary side including;
• a generally cylindrical outer shell have a central axis;
• a generally cylindrical wrapper supported above at least a portion of the tube sheet, within, spaced from and coaxially positioned with respect to the shell and forming a downcomer region between at least part of the wrapper and the shell;
• a feedring positioned above the downcomer region for introducing feedwater into the downcomer region, the feedring having a water passage within the feedring, the water passage having a substantially constant diameter substantially around an entire interior length, except in a location of a standpipe wherein the diameter of a portion of a circumference of the water passage is enlarged;
• a plurality of the standpipes are spaced circumferentially along the feedring in a direction of feedwater flow, with the standpipes extending vertically from a lower portion of an interior of the feedring upward through the interior of the feedring and having a feedwater intake only in an upper portion of the feedring, substantially above a middle elevation, with substantially all of the feedwater entering the standpipes entering from the feedwater intakes in the upper portion of the feedring at substantially the same elevation within the feedring and a feedwater discharge at or below a bottom of the feedring, for distributing the feedwater into the downcomer region;
• and
• a spray nozzle suspended within the standpipe.