Steam Turbine Plant

Abstract

A steam turbine plant of the present invention includes a heat source device that heats a low temperature fluid by a heat source medium to obtain a high temperature fluid, a steam generating device that generates steam by heat exchange with the high temperature fluid, a steam turbine that is driven by the steam, a heating flow path that is disposed on an outer surface of a casing of the steam turbine, a high temperature fluid supply passage that is branched from a flow path of the high temperature fluid in the steam generating device, is connected to the heating flow path, and supplies the high temperature fluid to the heating flow path, and a high temperature fluid flow rate regulating device that regulates a flow rate of the high temperature fluid flowing through the high temperature fluid supply passage.

What is claimed is: 
     
         1 . A steam turbine plant comprising:
 a heat source device that heats a low temperature fluid by a heat source medium to obtain a high temperature fluid;   a steam generating device that generates steam by heat exchange with the high temperature fluid obtained by the heat source device;   a steam turbine that is driven by the steam generated by the steam generating device;   a heating flow path that is disposed on an outer surface of a casing of the steam turbine or inside a member configuring the casing;   a high temperature fluid supply passage that is branched from a flow path of the high temperature fluid in the steam generating device, is connected to the heating flow path, and supplies the high temperature fluid to the heating flow path; and   a high temperature fluid flow rate regulating device that regulates a flow rate of the high temperature fluid flowing through the high temperature fluid supply passage.   
     
     
         2 . The steam turbine plant according to  claim 1 , further comprising:
 a heating control circuit that controls the high temperature fluid flow rate regulating device such that the flow rate of the high temperature fluid flowing through the high temperature fluid supply passage is increased, as differential thermal expansion between a rotor and the casing of the steam turbine is increased.   
     
     
         3 . The steam turbine plant according to  claim 1 ,
 wherein the heating flow path is disposed on the outer surface of the casing of the steam turbine or inside the member configuring the casing, and on a portion to be a relatively low temperature at a time of starting a plant,   the plant further comprising:   a cooling flow path that is disposed on the outer surface of the casing or inside the member configuring the casing, and on a portion to be a relatively high temperature at the time of starting the plant;   a low temperature fluid supply passage that supplies the low temperature fluid to the cooling flow path; and   a low temperature fluid flow rate regulating device that regulates a flow rate of the low temperature fluid flowing through the low temperature fluid supply passage.   
     
     
         4 . The steam turbine plant according to  claim 3 , further comprising:
 a cooling control circuit that controls the low temperature fluid flow rate regulating device so that the flow rate of the low temperature fluid flowing through the cooling flow path is increased, as temperature difference between a portion where the cooling flow path is disposed and a portion where the heating flow path is disposed is increased.