초록 ▼

A method of operating a combined gas and steam turbine cycle system including a steam turbine provided with steam from at least one heat recovery steam generator having a high pressure section and a low pressure section, wherein the steam turbine includes high pressure seals and low pressure seals,

A method of operating a combined gas and steam turbine cycle system including a steam turbine provided with steam from at least one heat recovery steam generator having a high pressure section and a low pressure section, wherein the steam turbine includes high pressure seals and low pressure seals, includes the steps of: a) when the steam turbine is operating at a load below a self-sealing load, supplying steam at a controlled, predetermined pressure to the high and low pressure seals from the high pressure section of the heat recovery steam generator; and b) after steam from the lower pressure section of the heat recovery stem generator exceeds the predetermined pressure, supplying the high and low pressure seals with steam from the lower pressure section of the heat recovery steam generator at a pressure higher than the predetermined pressure, and c) supplying steam from the high pressure section of the heat recovery steam generator whenever a turbine metal inlet temperature exceeds a predetermined reference temperature and turbine load is less than a predetermined reference load.

대표청구항 ▼

A method of operating a steam turbine at a load below a self-sealing load such that make-up steam must be supplied to a plurality of high and low pressure seals of the steam turbine, wherein the steam turbine includes a metal inlet, and wherein steam for the steam turbine is supplied from a heat rec

A method of operating a steam turbine at a load below a self-sealing load such that make-up steam must be supplied to a plurality of high and low pressure seals of the steam turbine, wherein the steam turbine includes a metal inlet, and wherein steam for the steam turbine is supplied from a heat recovery steam generator having high and low pressure sections via high and low pressure headers, respectively, the method comprising the steps of: a) supplying steam from the high or low pressure sections of the heat recovery steam generator to said plurality of high and low pressure seals of the steam turbine via a seal steam header; and b) controlling which of the high and low pressure sections of the heat recovery steam generator supplies said steam to said plurality of high and low pressure seals as a function of pressure in said low pressure header which is connected to the low pressure section of the heat recovery steam generator, percent turbine load, and temperature of said metal inlet of said turbine.