Power generation facility

Abstract

A power generation facility in an embodiment includes: a boiler; a high-pressure turbine to which steam generated in the boiler is introduced; a low-pressure turbine provided downstream of the high-pressure turbine; and a condenser that condenses steam discharged from the low-pressure turbine. The power generation facility further includes: a feed pipe that leads feedwater in the condenser to the boiler; a heat storage and steam generation device that has a heat storage function that uses surplus energy generated in an own system to store heat, and a steam generation function that has part of feedwater led by the feed pipe introduced thereinto and turns the feedwater into steam by the stored heat; and a steam supply pipe that supplies steam generated in the heat storage and steam generation device to an own system.

1 . A power generation facility, comprising:
 a boiler that generates steam;   a first steam turbine into which steam generated in the boiler is introduced;   a second steam turbine provided downstream of the first steam turbine in a flow direction of steam flow;   a condenser that condenses steam discharged from the second steam turbine;   a feed pipe that leads condensed water condensed in the condenser to the boiler as feedwater;   a heat storage and steam generation device having a heat storage function that uses surplus energy generated in an own system to store heat, and a steam generation function that has part of feedwater led by the feed pipe introduced thereinto and turns the feedwater into steam by the stored heat; and   a steam supply pipe that supplies steam generated in the heat storage and steam generation device to an own system.   
     
     
         2 . The power generation facility according to  claim 1 , further comprising:
 a third steam turbine provided between the first steam turbine and the second steam turbine in the flow direction of the steam flow;   a reheat boiler that reheats steam discharged from the first steam turbine; and   a high-temperature reheat steam pipe that introduces reheated steam reheated in the reheat boiler into the third steam turbine.   
     
     
         3 . The power generation facility according to  claim 1 , wherein
 when increasing a steam generation amount in the boiler, steam is generated in the heat storage and steam generation device to be introduced into an own system.   
     
     
         4 . The power generation facility according to  claim 1 , wherein
 the surplus energy is energy of surplus steam generated in the boiler, and   the heat storage and steam generation device stores heat that the surplus steam has.   
     
     
         5 . The power generation facility according to  claim 2 , wherein
 the surplus energy is energy of surplus steam generated in the boiler or energy of surplus steam superheated in the reheat boiler, and   the heat storage and steam generation device stores heat that the surplus steam has.   
     
     
         6 . The power generation facility according to  claim 1 , wherein
 the surplus energy is surplus power generated in the power generation facility, and   the heat storage and steam generation device includes a thermoelectric converter that generates heat by electric power, and the heat storage and steam generation device uses the surplus power to store heat generated from the thermoelectric converter.   
     
     
         7 . The power generation facility according to  claim 5 , further comprising:
 a low-temperature reheat steam pipe that introduces steam discharged from the first steam turbine into the reheat boiler, wherein   when the surplus energy is energy of surplus steam generated in the boiler,   the surplus steam that has provided heat to the heat storage and steam generation device is introduced into the low-temperature reheat steam pipe.   
     
     
         8 . The power generation facility according to  claim 4 , further comprising:
 an extraction steam pipe provided at a predetermined turbine stage of the first steam turbine; and   a feedwater heater that is provided through the feed pipe and heats feedwater by extraction steam introduced from the extraction steam pipe, wherein   the surplus steam that has provided heat to the heat storage and steam generation device is introduced into the extraction steam pipe.   
     
     
         9 . The power generation facility according to  claim 5 , further comprising:
 a first extraction steam pipe provided at a predetermined turbine stage of the first steam turbine;   a first feedwater heater that is provided through the feed pipe and heats feedwater by extraction steam introduced from the first extraction steam pipe;   a second extraction steam pipe provided at a predetermined turbine stage of the third steam turbine; and   a second feedwater heater that is provided through the feed pipe and heats feedwater by extraction steam introduced from the second extraction steam pipe, wherein   the surplus steam that has provided heat to the heat storage and steam generation device is introduced into the first extraction steam pipe or the second extraction steam pipe.   
     
     
         10 . The power generation facility according to  claim 5 , wherein
 the surplus steam that has provided heat to the heat storage and steam generation device is introduced into the condenser.   
     
     
         11 . The power generation facility according to  claim 1 , wherein
 the own system to which steam is supplied by the steam supply pipe is the second steam turbine.   
     
     
         12 . The power generation facility according to  claim 1 , further comprising:
 an extraction steam pipe provided at a predetermined turbine stage of the second steam turbine; and   a feedwater heater that is provided through the feed pipe and heats feedwater by extraction steam introduced from the extraction steam pipe, wherein   the own system to which steam is supplied by the steam supply pipe is the extraction steam pipe.   
     
     
         13 . The power generation facility according to  claim 1 , further comprising:
 a feed pump drive turbine that drives a feed pump that pumps feedwater into the feed pipe; and   a steam supply pipe for a feed pump drive turbine, that supplies part of steam to be introduced into the second steam turbine to the feed pump drive turbine, wherein   the own system to which steam is supplied by the steam supply pipe is the feed pump drive turbine.   
     
     
         14 . The power generation facility according to  claim 1 , wherein
 the heat storage and steam generation device includes:   a container filled with a chemical heat storage material;   a heat exchange pipe arranged between the chemical heat storage materials inside the container;   a water supply pipe that supplies water or water vapor to the chemical heat storage material; and   a drain pipe that discharges water or water vapor generated by the chemical heat storage material,   when heat is stored in the heat storage and steam generation device,   surplus steam having the surplus energy is supplied to the heat exchange pipe, and   water or water vapor generated by the chemical heat storage material is discharged through the drain pipe, and   when steam is generated in the heat storage and steam generation device,   water or water vapor is supplied from the water supply pipe to the chemical heat storage material,   feedwater is supplied from the feed pipe to the heat exchange pipe, and   steam generated in the heat exchange pipe is supplied to the steam supply pipe.   
     
     
         15 . The power generation facility according to  claim 1 , wherein
 the heat storage and steam generation device includes:   a first container filled with a chemical heat storage material;   a heat exchange pipe arranged between the chemical heat storage materials inside the first container;   a water supply pipe that supplies water or water vapor to the chemical heat storage material;   a drain pipe that discharges water or water vapor generated by the chemical heat storage material;   a second container filled with a latent heat storage material or a sensible heat storage material; and   a connecting pipe connecting the heat exchange pipe and the second container,   when heat is stored in the heat storage and steam generation device,   surplus steam having the surplus energy is supplied to the heat exchange pipe,   the surplus steam is supplied from the heat exchange pipe into the second container through the connecting pipe, and   water or water vapor generated by the chemical heat storage material is discharged through the drain pipe, and   when steam is generated in the heat storage and steam generation device,   feedwater is supplied from the feed pipe into the second container,   water or water vapor is supplied from the water supply pipe to the chemical heat storage material,   the feedwater is supplied from the second container to the heat exchange pipe through the connecting pipe in the form of water or steam, and   steam generated in the heat exchange pipe is supplied to the steam supply pipe.   
     
     
         16 . The power generation facility according to  claim 1 , wherein
 the heat storage and steam generation device includes:   a container filled with a chemical heat storage material;   a heat exchange pipe arranged between the chemical heat storage materials inside the container;   a thermoelectric converter that is arranged between the chemical heat storage materials inside the container and uses surplus power, which is the surplus energy, to generate heat;   a water supply pipe that supplies water or water vapor to the chemical heat storage material; and   a drain pipe that discharges water or water vapor generated by the chemical heat storage material,   when heat is stored in the heat storage and steam generation device,   the surplus power is supplied to the thermoelectric converter, and   water or water vapor generated by the chemical heat storage material is discharged through the drain pipe, and   when steam is generated in the heat storage and steam generation device,   water or water vapor is supplied from the water supply pipe to the chemical heat storage material,   feedwater is supplied from the feed pipe to the heat exchange pipe, and   steam generated in the heat exchange pipe is supplied to the steam supply pipe.