F - Mech Eng,Light,Heat,Weapons – 01 – D
Patent
F - Mech Eng,Light,Heat,Weapons
01
D
341/12
F01D 17/00 (2006.01) F01D 17/24 (2006.01) F01D 19/00 (2006.01) F01D 21/00 (2006.01) F01K 7/24 (2006.01)
Patent
CA 1169528
17TU-2882 CONTROL SYSTEM FOR BYPASS STEAM TURBINES ABSTRACT OF THE DISCLOSURE A control system for s 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 multiply- ing 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 boilder 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.
384841
Company General Electric
Eckersley Raymond A.
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