Control system for bypass steam turbines

Details Control system for bypass steam turbines Control system for bypass steam turbines

1980-09-05

1982-11-09

Ostrager, Allen M.

Power plants

Motive fluid energized by externally applied heat

Having condition responsive control

60663, 60667, 60679, F01K 1302

Patent

active

043578039

ABSTRACT:
A control system for a steam turbine operated with a steam bypass system. In the control system, bypass valve control is according to setpoints generated as a function of a combined flow reference (CFR) signal. The CFR signal is representative of boiler outlet flow under all turbine operating phases and is generated by multiplying the sum of the steam admission control valve flow demand and the high pressure bypass flow demand by boiler pressure. An actual load demand (ALD) signal indicative of the turbine demand for steam is produced from the product of the steam admission control valve flow demand and boiler pressure, and is used for intercept valve control. Excessive steam flow in the lower pressure bypass subsystem is prevented by providing an override for the normal control to prevent high heat impact to the condenser and latter stages of the turbine high pressure section.

REFERENCES:
patent: 3097488 (1963-07-01), Eggenberger et al.
patent: 3488961 (1970-01-01), Gerber
patent: 3699681 (1972-10-01), Frutschi
patent: 3919846 (1975-11-01), Lecocq
patent: 3928972 (1975-12-01), Osborne
patent: 4118935 (1975-10-01), Andersson
patent: 4132076 (1979-01-01), Weiss
patent: 4201924 (1980-05-01), Uram
Vol. 35, Proceedings of the American Power Conference, "Bypass Stations for Better Coordination Between Steam Turbine and Steam Generator Operation," P. Martin et al.

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