Patent DE-3249437-C2 (DE)
Title: Output control supercritical-pressure steam generator-turbine
Inventor: DOLAN JOHN EDWARD
IPC: F22B35/12
Filed: 1982-04-19
Granted: 1995-08-10
Abstract: The method for varying turbine output is applicable for use in an installation having a steam generator for generating steam, a feed water pump for maintaining pressure in the steam generator to a predetermined amount in excess of the critical pressure, a superheater, a pressure reducing division valve located between the steam generator and the superheater and a control valve associated with the turbine for regulating entry of steam to the turbine. - The operating steps include setting the turbine control valve to a predetermined position, maintaining the division valve in a fully open position and varying the rate of delivery of the feed water pump in order to vary steam pressure in the steam generator within a range. The high pressure point is at a predetermined amount in excess of the critical pressure and the low pressure point is slightly above the critical pressure. (Dwg.1/5) GBAB- GB2128257 B A method of varying turbine output above approximately 65% of turbine rated output in an installation including a steam generator, a feed water pump for producing pressure in said generator to a predetermined amount in excess of the critical pressure of steam, a superheater, a controllable division valve positioned between said superheater and said steam generator for regulating the pressure of steam delivered from said steam generator to said superheater, a turbine receiving steam from said superheater and a turbine control valve for regulating entry of steam to said turbine and including the step of maintaining said division valve in a fully open position at approximately 65% turbine rated output, wherein said method includes the additional steps of setting the turbine control valve to a predetermined open position, and of varying the rate of delivery of said feed water pump to vary steam pressure in said steam generator between said predetermined amount in excess of said critical pressure and an amount slightly above said critical pressure and an amount slightly above said critical pressure while at the same time maintaining said turbine control valve at said predetermined open position whereby the steam pressure at said turbine control valve is varied between said amount slightly above said critical pressure and said predetermined amount in excess of said critical pressure to vary the turbine output. - GB2128257 B A method of varying turbine output above approximately 65% of turbine rated output in an installation including a steam generator, a feed water pump for producing pressure in said generator to a predetermined amount in excess of the critical pressure of steam, a superheater, a controllable division valve positioned between said superheater and said steam generator for regulating the pressure of steam delivered from said steam generator to said superheater, a turbine receiving steam from said superheater and a turbine control valve for regulating entry of steam to said turbine and including the step of maintaining said division valve in a fully open position at approximately 65% turbine rated output, wherein said method includes the additional steps of setting the turbine control valve to a predetermined open position, and of varying the rate of delivery of said feed water pump to vary steam pressure in said steam generator between said predetermined amount in excess of said critical pressure and an amount slightly above said critical pressure and an amount slightly above said critical pressure while at the same time maintaining said turbine control valve at said predetermined open position whereby the steam pressure at said turbine control valve is varied between said amount slightly above said critical pressure and said predetermined amount in excess of said critical pressure to vary the turbine output.