Abstract: A steam turbine system 1 includes a steam turbine 10 including a plurality of rotor blades 16; a first mixed steam supply pipe 21 that supplies the steam, which is supplied from a steam supply source 40 capable of supplying the steam with fluctuating pressure, to an upstream stage Sa within the casing 11; a second mixed steam supply pipe 22 that supplies the steam to the second stepped part Sb; an adjusting unit 25 that adjusts a flow rate of the steam supplied to the first stepped part Sa and the second stepped part Sb; and a control unit 30 that controls the adjusting unit 25 on the basis of a differential pressure between a pressure P0 of the steam supplied from the steam supply source 40 and a pressure in the first stepped part Sa.

Abstract: A steam turbine system includes: a steam turbine having a casing into which steam is fed from an outside of the casing and a rotating shaft that is provided within the casing so as to be rotatable around a central axis; a deaerator that is connected to the steam turbine and that deaerates leaked steam that has leaked from a gap between the casing and the rotating shaft to the outside of the casing; a vacuum pump that is connected to the deaerator and that lowers a pressure within the deaerator; and a shaft sealing device that is connected to the deaerator and that seals the gap between the casing and the rotating shaft. The shaft sealing device has a seal member having a seal body, a housing, a biasing member, and a negative-pressure introduction part.

Abstract: A steam turbine system 1 includes a steam turbine 10including a plurality of rotor blades 16; a first mixed steam supply pipe 21 that supplies the steam, which is supplied from a steam supply source 40 capable of supplying the steam with fluctuating pressure, to an upstream stage Sa within the casing 11; a second mixed steam supply pipe 22 that supplies the steam to the second stepped part Sb; an adjusting unit 25 that adjusts a flow rate of the steam supplied to the first stepped part Sa and the second stepped part Sb; and a control unit 30 that controls the adjusting unit 25 on the basis of a differential pressure between a pressure P0 of the steam supplied from the steam supply source 40 and a pressure in the first stepped part Sa.

Abstract: A valve device includes a main steam valve that is provided on a steam flow channel, a regulating valve that is provided on the steam flow channel to be connected to the main steam valve in series and that includes a first valve seat and a first valve body, an overload valve that is provided on a branch flow channel which connects a portion of the steam flow channel between the main steam valve and the regulating valve and a steam turbine to each other and that includes a second valve seat and a second valve body, and a driving unit that drives the first valve body and the second valve body as a common driving source of the first valve body and the second valve body such that the first valve body and the second valve body are interlocked with each other.

Abstract: A steam turbine system includes: a steam turbine having a casing into which steam is fed from an outside of the casing and a rotating shaft that is provided within the casing so as to be rotatable around a central axis; a deaerator that is connected to the steam turbine and that deaerates leaked steam that has leaked from a gap between the casing and the rotating shaft to the outside of the casing; a vacuum pump that is connected to the deaerator and that lowers a pressure within the deaerator; and a shaft sealing device that is connected to the deaerator and that seals the gap between the casing and the rotating shaft. The shaft sealing device has a seal member having a seal body, a housing, a biasing member, and a negative-pressure introduction part.

Abstract: A valve device includes a main steam valve that is provided on a steam flow channel, a regulating valve that is provided on the steam flow channel to be connected to the main steam valve in series and that includes a first valve seat and a first valve body, an overload valve that is provided on a branch flow channel which connects a portion of the steam flow channel between the main steam valve and the regulating valve and a steam turbine to each other and that includes a second valve seat and a second valve body, and a driving unit that drives the first valve body and the second valve body as a common driving source of the first valve body and the second valve body such that the first valve body and the second valve body are interlocked with each other.