STEAM GENERATOR WITH TUBE ALIGNING ORIFICE

摘要

A heat transfer system includes a plenum configured to provide a secondary side fluid such as feedwater to a plurality of heat transfer tubes from a primary side fluid, and a tube sheet coupled to the plurality of heat transfer tubes. An orifice plate is mounted within the plenum and located adjacent to the tube sheet, and one or more orifice devices are supported by the orifice plate and are configured for insertion into or sealing against the plurality of heat transfer tubes. The one or more orifice devices may include center flow orifices, and/or rectangular or helical shaped transition stepped annular flow orifices, and an insertion of a number of the transition steps into the plurality of heat transfer tubes may determine a corresponding pressure drop of the secondary side fluid in the heat transfer system.

主权项

1. A heat transfer system comprising:
a plenum configured to provide feedwater to a plurality of heat transfer tubes; a tube sheet configured to couple the plurality of heat transfer tubes to the plenum; an orifice plate mounted within the plenum and located adjacent to the tube sheet; and one or more orifice devices supported by the orifice plate and configured for insertion into the plurality of heat transfer tubes, wherein the one or more orifice devices comprise helical shaped transition steps, and wherein an insertion of the helical shaped transition steps into the plurality of heat transfer tubes determines a corresponding pressure drop of the feedwater in the heat transfer system.