METHOD OF GENERATING SEALING STEAM FOR A STEAM TURBINE, STEAM POWER PLANT HAVING A STEAM TURBINE AND METHOD OF STARTING UP A STEAM TURBINE.

摘要

A METHOD OF GENERATING STEAM FOR A STEAM TURBINE INCLUDES EXTRACTING A FIRST PARTIAL FLOW OF SATURATED STEAM FROM A STEAM DRUM. THE FIRST PARTIAL FLOW OF SATURATED STEAM IS THROTTLED AND THEN SUPERHEATED BY HEAT EXCHANGE WITH A SECOND PARTIAL FLOW OF THE SATURATED STEAM. A STEAM POWER PLANT INCLUDES A STEAM TURBINE HAVING A WATER/STEAM CYCLE IN WHICH A STEAM DRUM IS CONNECTED.A SEPARATE SEALING-STEAM LINE LEADS FROM SAID STEAM DRUM TO SAID STEAM TURBINE. A HEAT EXCHANGER IN SAID SEALING STEAM LINE HAS A PRIMARY SIDE AND A SECONDARY SIDE. THE PRIMARY SIDE IS CONNECTED TO SAID STEAM DRUM AND A THROTTLE MEMBER IS CONNECTED BETWEEN SAID SECONDARY SIDE AND SAID STEAM DRUM. A METHOD OF STARTING A STEAM TURBINE OF A STEAM POWER PLANT USES THE SEALING STEAM. THE STEAM SURBINE IS PUT AT AN ESPECIALLY LOW RISK OF CORROSION EVEN DURING RESTARTING AFTER SHUTDOWN.