Energy storage system
US-2023383718-A1 · Nov 30, 2023 · US
Startup method of Francis turbine and Francis turbine
US11608809B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11608809-B2 |
| Application number | US-202117351364-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jun 18, 2021 |
| Priority date | Jun 19, 2020 |
| Publication date | Mar 21, 2023 |
| Grant date | Mar 21, 2023 |
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- Title
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Abstract
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A startup method of a Francis turbine according to an embodiment includes: a bypass-valve opening step of opening the bypass valve with the inlet valve closed; an inlet-valve opening step of opening the inlet valve after the bypass-valve opening step; and a first rotation-speed increasing step of increasing a rotation speed of the runner by opening the guide vane at an opening that is 50% or more of a maximum opening before a flow velocity of a swirling flow flowing around the runner reaches 90 m/sec.
First claim
Opening claim text (preview).
The invention claimed is: 1. A startup method of a Francis turbine comprising an inlet valve provided to an inlet pipe that guides water to a casing, a bypass valve provided to a bypass pipe that bypasses the inlet valve and guides water to the casing, and a guide vane capable of regulating a flow rate of water to be guided to a runner provided in the casing, the startup method comprising: a bypass-valve opening step of opening the bypass valve with the inlet valve closed; an inlet-valve opening step of opening the inlet valve after the bypass-valve opening step; and a first rotation-speed increasing step of increasing a rotation speed of the runner by opening the guide vane at an opening that is 50% or more of a maximum opening before a flow velocity of a swirling flow flowing around the runner reaches 90 m/sec. 2. The startup method of a Francis turbine according to claim 1 , wherein the first rotation-speed increasing step is performed after the inlet-valve opening step. 3. The startup method of a Francis turbine according to claim 1 , wherein the first rotation-speed increasing step is performed before the bypass-valve opening step. 4. The startup method of a Francis turbine according to claim 1 , wherein the first rotation-speed increasing step is performed between the bypass-valve opening step and the inlet-valve opening step. 5. A Francis turbine comprising: a casing; an inlet pipe that guides water to the casing; an inlet valve provided to the inlet pipe; a bypass pipe that bypasses the inlet valve and guides water to the casing; a bypass valve provided to the bypass pipe; a runner provided in the casing; a guide vane capable of regulating a flow rate of water to be guided to the runner; and a control unit, wherein the control unit controls the inlet valve, the bypass valve and the guide vane to perform: a bypass-valve opening step of opening the bypass valve with the inlet valve closed; an inlet-valve opening step of opening the inlet valve after the bypass-valve opening step; and a first rotation-speed increasing step of increasing a rotation speed of the runner by opening the guide vane at an opening that is 50% or more of a maximum opening before a flow velocity of a swirling flow flowing around the runner reaches 90 m/sec.
Assignees
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Classifications
in water turbines · CPC title
by speed, e.g. by measuring electric frequency or liquid flow · CPC title
- F03B11/004Primary
Valve arrangements (F03B3/10 takes precedence; adjustable wicket gates F03B3/183; valves in general F16K) · CPC title
- F03B15/005Primary
Starting, also of pump-turbines · CPC title
Starting · CPC title
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Frequently asked questions
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- What does patent US11608809B2 cover?
- A startup method of a Francis turbine according to an embodiment includes: a bypass-valve opening step of opening the bypass valve with the inlet valve closed; an inlet-valve opening step of opening the inlet valve after the bypass-valve opening step; and a first rotation-speed increasing step of increasing a rotation speed of the runner by opening the guide vane at an opening that is 50% or mo…
- Who is the assignee on this patent?
- Toshiba Kk, Toshiba Energy Systems & Solutions Corp
- What technology area does this patent fall under?
- Primary CPC classification F03B11/004. Mapped technology areas include Mechanical Engineering.
- When was this patent published?
- Publication date Tue Mar 21 2023 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).