Turbine high pressure bypass temperature control system and method
AssigneeWestinghouse Electric Corp.
InventorsMorton H. Binstock, Thomas H. McCloskey, Leaman B. Podolsky
Life of this patent
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Abstract
A bypass system for a steam turbine wherein the temperature of the steam bypassed around the high pressure turbine is accurately controlled by measuring the inlet and outlet temperatures of the boiler reheater and generating an adaptive set point. The set point value is used to govern operation of a spray valve which admits cooling water to the bypass steam path.
Claims22
High pressure temperature control apparatus for a steam turbine system having a steam generator, a high pressure turbine, at least one lower pressure turbine, a reheater in the steam flow path between said high and lower pressure turbines, and a steam bypass path for bypassing said turbines comprising:
- (A) high pressure bypass valve means in said steam bypass path for controlling the introduction of steam into said bypass path;
- (B) means for controlling said high pressure bypass valve means in response to predetermined pressure conditions of said system;
- (C) means for measuring the temperature of the steam at the input and output of said reheater for providing respective cold and hot reheat temperature signals indicative thereof;
- and
- (D) means for regulating the temperature of the steam passed by said high pressure bypass valve means as a function of both said cold and hot reheat temperature signals.
High pressure temperature control apparatus for a steam turbine system having a steam generator, a high pressure turbine, at least one lower pressure turbine, a reheater in the steam flow path between said high and lower pressure turbines, and a steam bypass path for bypassing said turbines comprising:
- (A) high pressure bypass valve means in said steam bypass path for controlling the introduction of steam into said bypass path;
- (B) means for controlling said high pressure bypass valve means in response to predetermined pressure conditions of said system;
- (C) means for measuring the temperature of the steam at the input and output and said reheater for providing respective cold and hot reheat temperature signals indicative thereof;
- (D) a source of cooling fluid;
- (E) high pressure spray valve means for admitting said cooling fluid into said steam bypass path;
- and
- (F) control means responsive to both said cold and hot reheat temperatures for governing operation of said high pressure spray valve means.
A method of controlling the steam temperature in a steam turbine high pressure bypass system which includes a steam reheater, comprising the steps of:
- (A) obtaining measurements of the input and output temperatures of said reheater;
- and
- (B) regulating the bypass steam temperature as a function of both said temperatures.
Dependencies are inferred from the claim text.