Steam turbine plant and cooling method for same
AssigneeMitsubishi Heavy Industries, Ltd.
InventorsDaiki Fujimura, Susumu Sekine
Life of this patent
Estimating the term…
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
A steam turbine plant comprising:
- a first 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 first boiler;
- a steam turbine that is driven by the steam from the first boiler;
- a main steam line that guides the steam generated by the first 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 first 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, the low-temperature steam valve being operable to adjust a flow rate of the low-temperature steam flowing in the low-temperature steam line;
- and
- a control device configured to send an open instruction to the low-temperature steam valve after sending a close instruction to the fuel valve,
- wherein the low-temperature steam generation source has a second boiler that generates steam independently of the first boiler, and a temperature reducer that reduces a temperature of the steam from the second boiler to generate the low-temperature steam.
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, the low-temperature steam valve being operable to adjust a flow rate of the low-temperature steam flowing in the low-temperature steam line,
- a control device configured to send an open instruction to the low-temperature steam valve after sending a close instruction to the fuel valve, and
- a temperature detector that detects a temperature of a location where the steam from the boiler comes into contact with the steam turbine,
- wherein the control device is operable to send a close instruction to the low-temperature steam valve when the temperature detected by the temperature detector is equal to or less than a predetermined temperature.
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.