US 2021/0246809 A1Published application

Steam turbine plant and cooling method for same

AssigneeMitsubishi Power, Ltd.

InventorsDaiki FUJIMURA, Susumu SEKINE

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Abstract

A steam turbine plant is provided with: a boiler; a fuel valve; a low-temperature steam generation source; a steam turbine; a main steam line that guides steam generated in the boiler to the steam turbine; a main steam adjustment valve that is provided to the main steam line; a low-temperature steam line that guides low-temperature steam from the low-temperature generation source to a position closer to the steam turbine-side than the main steam adjustment valve in the main steam line; a low-temperature steam valve provided to the low-temperature steam line; and a control device. During a stopping process of the steam turbine plant, the control device sends a command to close the fuel valve, and then sends a command to open the low-temperature steam valve.

Claims18

Dependent claims

A steam turbine plant comprising:

a boiler that generates steam;
a fuel valve that adjusts a flow rate of a fuel for generating the steam;
a low-temperature steam generation source that generates low-temperature steam independently of the boiler;
a steam turbine that is driven by the steam from the boiler;
a main steam line that guides the steam generated by the boiler to a steam inlet of the steam turbine;
a main steam adjustment valve that is provided to the main steam line, and adjusts a flow rate of the steam flowing into the steam turbine from the boiler;
a low-temperature steam line that is connected to the low-temperature steam generation source, and guides the low-temperature steam from the low-temperature steam generation source to the main steam line at a position closer to the steam turbine than the main steam adjustment valve;
a low-temperature steam valve that is provided to the low-temperature steam line, and adjusts a flow rate of the low-temperature steam flowing in the low-temperature steam line;
and
a control device,
wherein the control device sends an open instruction to the low-temperature steam valve after sending a close instruction to the fuel valve.

8 more elements

A cooling method of a steam turbine plant including a boiler that generates steam, a steam turbine that is driven by the steam from the boiler, a main steam line that guides the steam generated by the boiler to a steam inlet of the steam turbine, and a main steam adjustment valve that is provided to the main steam line, and adjusts a flow rate of the steam flowing into the steam turbine from the boiler, the cooling method executing:

a fuel stopping step of stopping a supply of a fuel for generating steam in the boiler;
and
a low-temperature steam supply step of guiding low-temperature steam from a low-temperature steam generation source that generates low-temperature steam independently of the boiler, to the main steam line at a position closer to the steam turbine than the main steam adjustment valve, after the fuel stopping step.

Dependencies are inferred from the claim text.