System to control axial thrust loads for steam turbines

Details System to control axial thrust loads for steam turbines System to control axial thrust loads for steam turbines

2005-10-25

2005-10-25

Look, Edward K. (Department: 3745)

Rotary kinetic fluid motors or pumps

Method of operation

C415S028000, C415S104000

Reexamination Certificate

active

06957945

ABSTRACT:
Apparatus (10) controls net thrust in a steam turbine (T) in response to changes in the operating condition of the turbine. The turbine includes a thrust bearing (B) positioned between low and intermediate pressure sections (LP, IP) of the turbine and a high pressure section (HP) thereof. Sensors (14) for sense thrust loads on the thrust bearing. A number of control valve (CV1-CV4) are used to balance pressures occurring at locations within the high pressure section of the turbine. A controller (16) is responsive to the sensors sensing a change within the turbine indicative of a significant change in net thrust to energize one or more of the control valves and to adjust the pressure within the high pressure section of the turbine so to maintain net thrust within an acceptable range of thrust values.

REFERENCES:
patent: 3565543 (1971-02-01), Mrazek
patent: 4152092 (1979-05-01), Swearingen
patent: 4557664 (1985-12-01), Tuttle et al.
patent: 4917570 (1990-04-01), Pankowiecki et al.
patent: 6131910 (2000-10-01), Bagepalli et al.

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