Governor valve positioning to overcome partial-arc admission...

Details Governor valve positioning to overcome partial-arc admission... Governor valve positioning to overcome partial-arc admission...

F - Mech Eng,Light,Heat,Weapons

01

K

F01K 17/00 (2006.01) F01D 17/18 (2006.01) F01K 7/16 (2006.01)

Patent

CA 2097968

57,146 ABSTRACT OF THE DISCLOSURE Method for improving the heat rate of a steam turbine operated in a partial-arc mode includes sequential closing of control valves to establish a first arc of admission at which pressure drop on a first control stage reaches a predetermined level. Steam pressure to the turbine may then be reduced in combination with valve closing to maintain first stage pressure at or below the predetermined level. In a further method, low power operation is achieved by maintaining a constant arc of admission while simultaneously moving all open valves toward a closed position.

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