Apparatus for reducing windage loss of steam turbines

Abstract

An apparatus for reducing windage loss of steam turbines according to an embodiment of the present disclosure is to reduce or minimize damage to a blade caused by a rise in temperature at an outlet stage of a high-pressure turbine.

What is claimed is: 
     
         1 . An apparatus, comprising:
 a turbine unit including a high-pressure turbine, a medium-pressure turbine, and a low-pressure turbine;   a condenser that receives steam from the low-pressure turbine;   a tank in which steam generated at the time of operation of the turbine unit converts into condensed water and is stored;   a steam supplier that supplys additional steam to an inlet stage of the high-pressure turbine;   a sensor that senses the temperature at the outlet stage of the high-pressure turbine and internal pressure; and   a controller configured to control an amount of steam supplied by the steam supplier based on temperature or pressure data sensed by the sensor.   
     
     
         2 . The apparatus of  claim 1 , wherein the steam supplier includes
 an extension pipe that extends between a second-stage turbine and a third-stage turbine of the high-pressure turbine,   a steam generator that supplies steam to the extension pipe, and   a first control valve coupled to the extension pipe, an opening degree of the first control valve being controlled by the controller.   
     
     
         3 . The apparatus of  claim 2 , wherein the extension pipe is arranged to suppls steam at a side of a turbine blade of the high-pressure turbine and orthogonal to a shaft of the high-pressure turbine. 
     
     
         4 . The apparatus of  claim 2 , wherein an end formed of the extension pipe includes a nozzle. 
     
     
         5 . The apparatus of  claim 2 , wherein the extension pipe is arranged to supple steam in a rotation direction of the high-pressure turbine. 
     
     
         6 . The apparatus of  claim 2 , wherein the extension pipe includes
 a first extension pipe that extends toward a turbine blade in order to supply steam in a rotation direction of the high-pressure turbine, and   a second extension pipe positioned opposite to the first extension pipe to supply steam in the rotation direction of the turbine blade.   
     
     
         7 . The apparatus of  claim 1 , further comprising a return pipe through which the steam supplied to the inlet stage of the high-pressure turbine is drained, a first end of the return pipe being coupled to the outlet stage of the high-pressure turbine and a second end of the return pipe being coupled to the tank. 
     
     
         8 . The apparatus of  claim 7 , wherein the return pipe includes a second control valve that controls an amount of drained steam. 
     
     
         9 . The apparatus of  claim 2 , wherein the controller is configured to control pressure of the steam supplied by the steam supplier based on pressure data according to a pressure drop between the second-stage turbine and the third-stage turbine. 
     
     
         10 . The apparatus of  claim 2 , wherein the steam supplier includes a pressure controller configured to supply the additional steam to the high-pressure turbine at a pressure determined by the controller. 
     
     
         11 . The apparatus of  claim 1 , wherein the tank stores steam drained from the medium-pressure turbine. 
     
     
         12 . An apparatus, comprising:
 a turbine unit including a high-pressure turbine, a medium-pressure turbine, and a low-pressure turbine;   a condenser that receives steam from the low-pressure turbine;   a tank in which steam generated at the time of operation of the turbine unit convers into condensed water and is stored;   a steam supplier that supplies additional steam to an inlet stage and an outlet stage of the high-pressure turbine;   a sensor that senses the temperature at the outlet stage of the high-pressure turbine and internal pressure; and   a controller configured to control an amount of steam supplied by the steam supplier by receiving data on the temperature and the pressure sensed by the sensor.   
     
     
         13 . The apparatus of  claim 12 , wherein the steam supplier includes
 a first extension pipe that extends between a second-stage turbine and a third-stage turbine of the high-pressure turbine,   a second extension pipe that extends toward a last stage of the high-pressure turbine, and   a steam generator that supplies steam to the first and second extension pipes.   
     
     
         14 . The apparatus of  claim 13 , wherein the steam supplier includes at least one first control valve coupled to the first and second extension pipes, an opening degree of the first control valve being controlled by the controller. 
     
     
         15 . The apparatus of  claim 13 , wherein the controller causes steam to be simultaneously supplied by the first and second extension pipes or causes steam to be selectively supplied by the first extension pipe and the second extension pipes. 
     
     
         16 . The apparatus of  claim 13 , wherein the controller is configured to control a pressure of the steam supplied to the first extension pipe and a pressure of the steam supplied to the second extension pipe to be different from each other. 
     
     
         17 . The apparatus of  claim 13 , further comprising a return pipe through which the steam supplied to the inlet stage of the high-pressure turbine is drained, a first end of the return pipe being coupled to the outlet stage of the high-pressure turbine and a second end of the return pipe being coupled to the tank.