Feed water heater

A feed water heater comprising:

• a cylindrical shell portion constituting a main body portion of a feed water heater;
• a water box operatively connected to the cylindrical shell portion and partitioned by a tubesheet;
• a heat exchanger tube bank arranged in the cylindrical shell portion and supported by support means therein;
• a drain cooling section, disposed in association with the heat exchanger tube bank, for carrying out a recovery of heat generated in the heat exchanger tube bank;
• a steam supply means provided for the cylindrical shell portion for supplying steam as a heating medium;
• a dilution condensing chamber provided for the heat exchanger tube bank and adapted to flow the steam excessively into the heat exchanger tube bank;
• and
• a non-condensable gas chamber provided for the heat exchanger tube bank for almost completely condensing the steam;
• wherein said support means is composed of a plurality of support plates supporting the heat exchanger tube bank, said dilution condensing chamber has a box-shaped structure utilizing the support plates and extending along a direction perpendicular to a location of said steam supply means formed as a steam inlet to an outer wall section of the cylindrical shell portion;
• further wherein said box-shaped dilution condensing chamber has a bottom portion which is closed by a blocking plate and is provided with louver means composed of flat plates which face the blocking plate with an inclination to the blocking plate.