US 12,372,003 B2
Steam turbine plant and method for improving same
Yoshikazu Sakanaka, Tokyo (JP)
Assigned to MITSUBISHI HEAVY INDUSTRIES, LTD., Tokyo (JP)
Appl. No. 18/841,073
Filed by MITSUBISHI HEAVY INDUSTRIES, LTD., Tokyo (JP)
PCT Filed Jan. 25, 2023, PCT No. PCT/JP2023/002163
§ 371(c)(1), (2) Date Aug. 23, 2024,
PCT Pub. No. WO2023/176155, PCT Pub. Date Sep. 21, 2023.
Claims priority of application No. 2022-042175 (JP), filed on Mar. 17, 2022.
Prior Publication US 2025/0179927 A1, Jun. 5, 2025
Int. Cl. F01D 11/04 (2006.01); F01D 11/06 (2006.01); F01K 9/00 (2006.01)
CPC F01D 11/06 (2013.01) [F01D 11/04 (2013.01); F01K 9/00 (2013.01); F05D 2240/63 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A steam turbine plant, comprising:
a steam turbine configured to be driven by steam supplied from a steam generation source;
a condenser configured to condense steam discharged from the steam turbine and convert the steam into water; and
a gas extraction system including a gas extractor configured to extract noncondensable gas in the condenser and connected to the condenser, wherein
the steam turbine includes
a turbine rotor that includes a first shaft portion and a second shaft portion on one side in an axial direction and the other side in the axial direction, respectively and is rotationally driven by the steam supplied from the steam generation source,
a casing that accommodates the turbine rotor with the first shaft portion and the second shaft portion penetrating, and
a first gland seal provided in a first gap between the first shaft portion and the casing and a second gland seal provided in a second gap between the second shaft portion and the casing,
only a first discharge system for discharging a gas flowing into the first gland seal is connected to the first gland seal,
only a second discharge system for discharging a gas flowing into the second gland seal is connected to the second gland seal,
the first discharge system is connected to the gas extraction system so as to guide the gas flowing into the first gland seal to the gas extractor without passing through the condenser,
the second discharge system is connected to the gas extraction system so as to guide the gas flowing into the second gland seal to the gas extractor without passing through the condenser,
wherein the gas extractor has a capacity equal to or greater than a predetermined threshold value,
the threshold value is determined based on a total amount of steam to be condensed required for the condenser, and
the threshold value is defined by an equation below:
Y=0.75×10(2.881+(1.401×10−6)X)  [Math. 1]
where X represents total amount of steam to be condensed required for the condenser, Y represents the threshold value of the capacity of the gas extractor, and units of X and Y are lb/hr.