Method and apparatus for thermal stress controlled loading of st

Details Method and apparatus for thermal stress controlled loading of st Method and apparatus for thermal stress controlled loading of st

1980-04-30

1982-03-23

Ostrager, Allen M.

Power plants

Motive fluid energized by externally applied heat

Process of power production or system operation

60657, F01K 1302

Patent

active

043206255

ABSTRACT:
Improved method and apparatus for controlling thermal stress on component parts of a steam turbine while providing maximum loading and unloading rates during startup, shutdown, and other periods of load change. From monitored and derived quantities, a loading rate is calculated for each of a plurality of preselected turbine component parts and the lowest rate is selected for control. Simultaneously, and in concert with load change calculation and execution, the steam admission mode of the turbine is automatically directed to either the partial arc mode or the full arc mode as necessary to reduce stress as compared with a preselected and adaptive stress reference value.

REFERENCES:
patent: 3446224 (1969-05-01), Zwicky, Jr.
patent: 3561216 (1971-02-01), Moore, Jr.
patent: 3588265 (1971-06-01), Berry
patent: 3928972 (1975-12-01), Osborne
patent: 4046002 (1977-09-01), Murphy et al.
patent: 4120159 (1978-10-01), Matsumoto et al.
patent: 4121424 (1978-10-01), Sato et al.
patent: 4181840 (1980-01-01), Osborne

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