Forward-reverse flow control system for a bypass steam turbine

Details Forward-reverse flow control system for a bypass steam turbine Forward-reverse flow control system for a bypass steam turbine

1980-09-29

1982-10-12

Ostrager, Allen M.

Power plants

Motive fluid energized by externally applied heat

Having condition responsive control

60646, 60657, 60652, F01K 1302

Patent

active

043532160

ABSTRACT:
A solution to the problem of excessive rotation loss heating in a bypass steam turbine has been provided by the introduction of a reverse flow of steam to the high-pressure section of the turbine during those operating periods in which such heating is of concern. The present invention is directed to a control system for automatically selecting either the forward or reverse steam flow regime as is most appropriate, depending on turbine and other related operating conditions. In a preferred embodiment, the control system includes means for selecting either a forward or reverse flow control signal to govern the steam admission control valves; means for controlling the reverse flow valve and having decisional logic for determining whether the reverse flow valve shall be open or closed; and means for controlling the ventilator valve and having decisional logic for determining whether the ventilator valve shall be open or closed.

REFERENCES:
patent: 4118935 (1978-10-01), Andersson
patent: 4132076 (1979-01-01), Weiss
patent: 4201924 (1980-05-01), Uram
patent: 4309873 (1982-01-01), Koran et al.
Vol. 35, Proceedings of the American Power Conference, "Bypass Stations for Better Coordination between Steam Generator Operation", Martin et al., May 1973.

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