Steam turbine with superheat retaining extraction

Details Steam turbine with superheat retaining extraction Steam turbine with superheat retaining extraction

1996-07-22

1997-10-14

Kwon, John T.

Rotary kinetic fluid motors or pumps

Including means for handling portion separated from working...

4151694, F01D 2500

Patent

active

056765215

ABSTRACT:
The improvement of this invention comprises a seal or other means for closing portions of the flow path between blade carriers for extraction steam as it leaves the main flow path of a steam turbine. The seal prevents the extraction of steam from most of the circumference of the turbine, allowing steam to be extracted only from a portion of the circumference. Hot tip leakage steam is thus retained in the turbine over those portions of the circumference where the seals close the extraction flow path wherein it is of substantial benefit in driving the turbine but is of little benefit when used for heating feedwater, with the colder steam being extracted in its place so that the total amount of steam extracted for heating feedwater is essentially unchanged.

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