초록 ▼

This application is directed to a method and apparatus for improving the useful thermal yield of a saturated water flashed steam source over a wide range of steam turbine load. A flash tank pressure control in its simplest form maintains constant steam pressure with variable input water flow and inl

This application is directed to a method and apparatus for improving the useful thermal yield of a saturated water flashed steam source over a wide range of steam turbine load. A flash tank pressure control in its simplest form maintains constant steam pressure with variable input water flow and inlet water enthalpy. This permits optimizing a design point relationship between water temperature, water flow, flash tank steam pressure and turbine stage pressure. If turbine stage pressure is used as a reference to reduce the flash tank steam pressure for part load operation, then more steam is available from a given flow of saturated water, and the throttling loss through the pressure control valve can be minimized.

대표청구항 ▼

In a steam turbine power plant wherein at least a portion of the total steam flow through a steam turbine is obtained from a flash tank connected to a steam admission point, a control system for regulating the flow of steam from the flash tank in accordance with steam turbine admission pressure comp

In a steam turbine power plant wherein at least a portion of the total steam flow through a steam turbine is obtained from a flash tank connected to a steam admission point, a control system for regulating the flow of steam from the flash tank in accordance with steam turbine admission pressure comprising: means generating a pressure reference signal based on turbine admission pressure; means generating an actual pressure signal based on flash tank pressure; means generating a first valve position signal based on the difference between the reference signal and the actual pressure signal; means generating a second valve position signal based on the speed/load signal for the steam turbine; a bypass valve responsive to the first valve position signal; and, a steam admission valve responsive to said second valve position signal when the bypass valve is open and to said first valve position signal after the bypass valve is closed.