Steam turbine plant

A steam turbine plant comprising:

• a high-medium pressure turbine having a high-pressure turbine section at a first end portion in an axial direction and a medium-pressure turbine section at a second end portion;
• a low-pressure turbine disposed coaxially with the high-medium pressure turbine;
• a condenser configured to cool steam used in the low-pressure turbine to condense the steam into condensate;
• a feed-water heater configured to heat the condensate with steam discharged from the high-pressure turbine section;
• a high-pressure moisture separating and heating device configured to remove moisture from steam discharged from the high-pressure turbine section, and to heat the steam discharged from the high-pressure turbine section using a part of steam to be sent to an inlet portion of the high-pressure turbine section;
• a low-pressure moisture separating and heating device configured to remove moisture of steam discharged from the medium-pressure turbine section, and to heat the steam discharged from the medium-pressure turbine section using a part of steam to be sent to an inlet portion of the high-pressure turbine section and using a part of steam to be sent to an inlet portion of the high-pressure moisture separating and heating device from an outlet portion of the high-pressure turbine section;
• and
• steam pipes configured to send steam discharged from the high-pressure turbine section, from the outlet portion of the high-pressure turbine section to the feed-water heater, the high-pressure moisture separating and heating device, and the low-pressure moisture separating and heating device.