Method for starting up a gas and steam turbine system

Abstract

A method for starting a gas and steam turbine system which includes a gas turbine system which includes at least one gas turbine, in addition to at least one steam turbine system which includes at least one steam turbine and at least one steam system is provided. Heat produced by the working fluid and which is released in the gas turbine is guided to the steam system in order to produce steam which drives the steam turbine. During starting, the gas turbine is started prior to the steam turbine and the steam turbine is started in the presence of the first steam in the system and is impinged upon by said steam.

1 . A method for starting up a gas and steam turbine system which has a gas turbine system comprising a gas turbine; a steam turbine system comprising a steam turbine and a steam system and in which the waste heat of a working medium expanding in the gas turbine is supplied to the steam system for the purpose of generating steam driving the steam turbine, the method comprising:
 supplying a waste heat of a working medium of the gas turbine to the steam system to produce steam for driving the steam turbine; and   starting up the steam turbine when the first steam is present in the steam system and is impinged upon by steam,   wherein the gas turbine system experiences a load increase at maximum load ramp during the entire startup operation   
     
     
         2 . The method as claimed in  claim 1 ,
 tuning the steam system during the startup operation in such a way that during the acceleration of the steam turbine the steam temperature increases at a low gradient.   
     
     
         3 . The method as claimed in  claim 1 ,
 tuning the steam system during the startup operation in such a way that the steam pressure increases continuously.   
     
     
         4 . The method as claimed in  claim 3 ,
 wherein the steam system comprises a steam diverter station, and   wherein the tuning includes opening a steam diverter station of the steam system only so wide that a minimum steam quantity required for accelerating and synchronizing the steam turbine is generated by a part of the waste heat of the working medium and an increase in pressure is produced in the steam system by the remainder of the waste heat of the working medium.   
     
     
         5 . The method as claimed in  claim 3 ,
 wherein no diverter station leading to a bypassing of the steam turbine is opened in the steam system.   
     
     
         6 . The method as claimed in  claim 1 ,
 wherein the load increase is maintained until the base load of the gas turbine system has been reached.   
     
     
         7 . The method as claimed in  claim 1 ,
 wherein the gas and steam turbine system is switched over into the gas and steam turbine operating mode during the increase in load.   
     
     
         8 . The method as claimed in  claim 3 ,
 tuning the steam system during the startup operation in such a way that the steam pressure increases continuously.   
     
     
         9 . The method as claimed in  claim 8 ,
 wherein the steam system comprises a steam diverter station, and   wherein the tuning includes opening a steam diverter station of the steam system only so wide that a minimum steam quantity required for accelerating and synchronizing the steam turbine is generated by a part of the waste heat of the working medium and an increase in pressure is produced in the steam system by the remainder of the waste heat of the working medium.   
     
     
         10 . The method as claimed in  claim 8 ,
 wherein no diverter station leading to a bypassing of the steam turbine is opened in the steam system.   
     
     
         11 . The method as claimed in  claim 2 ,
 wherein the load increase is maintained until the base load of the gas turbine system has been reached.   
     
     
         12 . The method as claimed in  claim 2 ,
 wherein the gas and steam turbine system is switched over into the gas and steam turbine operating mode during the increase in load.   
     
     
         13 . The method as claimed in  claim 3 ,
 wherein the load increase is maintained until the base load of the gas turbine system has been reached.   
     
     
         14 . The method as claimed in  claim 3 ,
 wherein the gas and steam turbine system is switched over into the gas and steam turbine operating mode during the increase in load.