| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a system for maintaining a thrust level within an acceptable range of values by controlling net thrust of a steam turbine and for avoiding a damage on a thrust bearing. <P>SOLUTION: The system controls net thrust of a steam turbine system having a stepped rotating shaft. A first leak off line fluidly couples a second stage of a turbine section having different pressure from that of a first stage to a step area immediately adjacent to a stepped portion; and a connection line fluidly couples the first leak off line to the second leak off line. The lines include control valves on which a controller controls the net thrust by regulating thrust pressure on the stepped portion using steam from the first and the second stages of the turbine section. The controller can also prevent damage to an active retractable seal by using the control valves. <P>COPYRIGHT: (C)2012,JPO&INPIT |
