Steam turbine facility and combined cycle plant

A steam turbine facility comprising:

• a rotor shaft;
• a high-pressure turbine blade row and an intermediate-pressure turbine blade row disposed on the rotor shaft;
• a first low-pressure turbine blade row and a second low-pressure turbine blade row disposed on the rotor shaft on both sides of the intermediate-pressure turbine blade row, respectively;
• and
• a third low-pressure turbine blade row and a fourth low-pressure turbine blade row disposed on the rotor shaft on both sides of the high-pressure turbine blade row, respectively,
• wherein the steam turbine facility is configured such that steam having passed through the intermediate-pressure turbine blade row is divided to flow into the first low-pressure turbine blade row, the second low-pressure turbine blade row, the third low-pressure turbine blade row, and the fourth low-pressure turbine blade row,
• wherein the steam turbine facility further comprises:
• a first casing for accommodating the intermediate-pressure turbine blade row, the first low-pressure turbine blade row, and the second low-pressure turbine blade row;
• and
• a second casing for accommodating the high-pressure turbine blade row, the third low-pressure turbine blade row, and the fourth low-pressure turbine blade row.

A steam turbine facility, comprising

• a rotor shaft;
• a high-pressure turbine blade row and an intermediate-pressure turbine blade row disposed on the rotor shaft;
• a first low-pressure turbine blade row and a second low-pressure turbine blade row disposed on the rotor shaft on both sides of the intermediate-pressure turbine blade row, respectively;
• and
• a third low-pressure turbine blade row and a fourth low-pressure turbine blade row disposed on the rotor shaft on both sides of the high-pressure turbine blade row, respectively,
• wherein the steam turbine facility is configured such that steam having passed through the intermediate-pressure turbine blade row is divided to flow into the first low-pressure turbine blade row, the second low-pressure turbine blade row, the third low-pressure turbine blade row, and the fourth low-pressure turbine blade row,
• wherein the first low-pressure turbine blade row is disposed downstream of the intermediate-pressure turbine blade row in a steam flow direction in the intermediate-pressure turbine blade row, and
• wherein the steam turbine facility includes a branched channel for introducing a part of a steam flow from the intermediate-pressure turbine blade row toward the first low-pressure turbine blade row to the second low-pressure turbine blade row, the third low-pressure turbine blade row, and the fourth low-pressure turbine blade row.