EP3044428A1 - Method for testing an overspeed protection device of a single-shaft plant - Google Patents
Method for testing an overspeed protection device of a single-shaft plantInfo
- Publication number
- EP3044428A1 EP3044428A1 EP14771218.6A EP14771218A EP3044428A1 EP 3044428 A1 EP3044428 A1 EP 3044428A1 EP 14771218 A EP14771218 A EP 14771218A EP 3044428 A1 EP3044428 A1 EP 3044428A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- speed
- steam turbine
- overspeed protection
- turbine
- gas turbine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
- F01D21/02—Shutting-down responsive to overspeed
Definitions
- the invention relates to a method for testing an overspeed protection device of a single-shaft system.
- Energy is a gas turbine, a steam turbine and a generator arranged on a common strand.
- the electrical energy is fed into an electrical network and the strand rotates at a speed corresponding to the rated speed of the single-shaft system, such as 50 Hz or 60 Hz.
- the speed may increase to levels above the rated speed.
- a critical speed a synchronicity of the power generated by the generator with the grid is no longer present and / or the single-shaft system is mechanically and thermally excessively loaded, which results in a shortening of the life of the single-shaft system.
- an overspeed protection device prevents further increase in the speed of the train, the limit speed being conventionally selected to be between the rated speed and the critical speed.
- the overspeed protection device is checked by operating the single-shaft system in a test mode in which the limit speed is lowered from the limit speed during normal operation to thereby avoid excessive load on the single-shaft system during test operation.
- the object of the invention is to provide a method for testing an overspeed protection device of a single-shaft system, wherein the method does not lead to an excessive load on the single-shaft system.
- the steam turbine limit speed By achieving the steam turbine limit speed by increasing the mass flow of the fuel and / or steam and not by shedding an electrical load connected to the generator, the steam turbine limit speed can advantageously be approached slowly and a critical rotational speed of the single-shaft system can advantageously be avoided. As a result, excessive mechanical and thermal loading of the single-shaft system during testing of the overspeed protection device can be avoided, whereby the life of the single-shaft system is long.
- the excessive load can be avoided with the method according to the invention even if the same limit value speeds are used for the gas turbine limit speed and the steam turbine limit speed as in normal operation of the single-shaft system.
- the steam turbine is coupled by means of a coupling to the single-shaft system
- the clutch engages as soon as the steam turbine overhauls the gas turbine, and decouples when the speed of the steam turbine is lower than that of the gas turbine, wherein step b) is performed such that the steam turbine is accelerated faster than the gas turbine, whereby the clutch remains engaged.
- step b) is performed such that the steam turbine is accelerated faster than the gas turbine, whereby the clutch remains engaged.
- the gas turbine and the steam turbine rotate at the same speed, while the steam turbine accelerates to its steam turbine limit, whereby it is thus advantageously ensured that the speed of the gas turbine does not reach a critical speed.
- the method is preferably performed with the step of: d) interrupting the mass flow of the steam introduced into the steam turbine in the event that the first overspeed contactor is triggered. Interrupting the mass flow of steam will cause the clutch to disengage and thus rotate the steam turbine independently of the gas turbine and the generator.
- the method with the steps of: e) increasing the mass flow of the fuel to reach a gas turbine limit speed higher than the steam turbine limit speed, wherein the overspeed protection device is arranged to initiate a second overspeed protection as soon as possible the speed of the gas turbine reaches the gas turbine limit speed; f) Check if the second overspeed protection is triggered.
- the second overspeed protection check may be performed after the first overspeed protection has been tested and independently of this test.
- Figure 2 shows a temporal speed curve of the single-shaft system
- Figure 3 shows a temporal power curve of the single-shaft system.
- a single-shaft system 1 has a gas turbine 2, a steam turbine 3 and an electric generator 4.
- the gas turbine 2 and the steam turbine 4 serve to generate rotational energy, wherein the rotational energy is converted in the generator 4 into electrical energy.
- the generator 4 is arranged between the gas turbine 2 and the steam turbine 3.
- the gas turbine 2 has a gas turbine shaft 5 and the steam turbine 3 has a steam turbine shaft 6.
- FIG. 1 shows that the generator 4 and the gas turbine 2 are arranged together on the steam turbine shaft 5.
- a separate generator shaft is provided for the generator 4, which is coupled by means of a coupling to the gas turbine shaft 5.
- the steam turbine shaft 6 is connected to the gas turbine shaft 5 by means of a clutch 7.
- the clutch 7 is set so that it engages when the steam turbine 3 overhauls the gas turbine 2, which means that the speed of the steam turbine 3 is higher than the speed of the gas turbine 2. Once the clutch 7 is engaged, the gas turbine 2 and the steam turbine 3 rotate at the same speed.
- the clutch 7 is further arranged to disengage when the steam turbine 3 rotates slower than the gas turbine 2.
- the clutch 7 may be, for example, an SSS clutch.
- an electrical load 10 can be connected to an electrical connection 8 of the generator 4.
- the power consumption of the load 10 corresponds to an electrical load connected to the generator 4. If now the load connected to the generator 4 drops, without the mass flows of the steam introduced into the steam turbine 3 and / or the fuel introduced into the gas turbine 2 being lowered, this leads to an increase in the rotational speed of the single-shaft system 1
- Switch 9 ensures that when checking the overspeed protection device no electrical load is connected to the generator 4. In order to avoid an increase in the speed of the single-shaft system 1 to a critical value, the single-shaft system 1 has an overspeed protection device.
- the overspeed protection device is set up in such a way that a first overspeed protection is triggered as soon as the speed of the steam turbine 3 reaches a steam turbine limit speed 13 and a second overspeed protection is triggered as soon as the speed of the gas turbine 2 reaches a gas turbine limit speed 14.
- first overspeed protection for example, the mass flow of the fuel and / or the mass flow of the steam can be interrupted.
- second overspeed protection the mass flow of the fuel can also be interrupted.
- Figure 2 shows a temporal speed curve of the single-shaft system and Figure 3 shows the associated temporal performance curves of the gas turbine 2 and the steam turbine 3.
- the time characteristic of the power 19 of the steam turbine 3 is characterized by the fact that the power 19 continuously increases in the time range of 2 to 7 wE and then abruptly drops to zero due to the triggering of the first overspeed protection ,
- the associated time profile of the power of the gas turbine 2 is characterized by a continuous drop to the time of 7 wE to then continuously until the time point 11 wE, when the actual speed 16 reaches the gas turbine limit value speed 14, to increase continuously.
- the exemplary method for testing an overspeed protection device of a one-turbine system comprising a gas turbine 2, a generator 4 and a steam turbine 5, wherein the steam turbine 3 is coupled by means of a clutch 7 to the single-shaft system 1, the clutch 7 engages as soon as the steam turbine 3 the Gas turbine 2 overhauled, and disengages when the speed of the steam turbine 3 is smaller than that of the gas turbine 2, is carried out with the steps of: a) operating the single-shaft system 1 at its rated speed and wherein no electric load is connected to the generator 4; b) increasing the mass flow of the steam introduced into the steam turbine 3 and / or the fuel introduced into the gas turbine 2 such that the speed of the steam turbine 3 reaches a steam turbine limit speed, wherein the increasing is performed such that the steam turbine 3 accelerates faster than the gas turbine 2 whereby the clutch 7 remains engaged, the overspeed protection device being arranged such that a first overspeed protection is triggered as soon as the speed of the steam turbine 3 reaches the steam turbine limit speed; c) Check if
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP14771218.6A EP3044428B1 (en) | 2013-09-17 | 2014-09-08 | Method for testing an overspeed protection system of a single-shaft system |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP13184817.8A EP2848772A1 (en) | 2013-09-17 | 2013-09-17 | Method for testing an overspeed protection system of a single-shaft system |
PCT/EP2014/069071 WO2015039910A1 (en) | 2013-09-17 | 2014-09-08 | Method for testing an overspeed protection device of a single-shaft plant |
EP14771218.6A EP3044428B1 (en) | 2013-09-17 | 2014-09-08 | Method for testing an overspeed protection system of a single-shaft system |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3044428A1 true EP3044428A1 (en) | 2016-07-20 |
EP3044428B1 EP3044428B1 (en) | 2019-05-15 |
Family
ID=49182153
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13184817.8A Withdrawn EP2848772A1 (en) | 2013-09-17 | 2013-09-17 | Method for testing an overspeed protection system of a single-shaft system |
EP14771218.6A Not-in-force EP3044428B1 (en) | 2013-09-17 | 2014-09-08 | Method for testing an overspeed protection system of a single-shaft system |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13184817.8A Withdrawn EP2848772A1 (en) | 2013-09-17 | 2013-09-17 | Method for testing an overspeed protection system of a single-shaft system |
Country Status (3)
Country | Link |
---|---|
EP (2) | EP2848772A1 (en) |
KR (1) | KR101834099B1 (en) |
WO (1) | WO2015039910A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114382597B (en) * | 2021-11-10 | 2023-10-27 | 烟台杰瑞石油装备技术有限公司 | Gas turbine overspeed protection method, device, electronic equipment and readable storage medium |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5199256A (en) * | 1989-01-26 | 1993-04-06 | General Electric Company | Overspeed protection for a gas turbine/steam turbine combined cycle |
US5301499A (en) * | 1990-06-28 | 1994-04-12 | General Electric Company | Overspeed anticipation and control system for single shaft combined cycle gas and steam turbine unit |
JP3930462B2 (en) * | 2003-08-01 | 2007-06-13 | 株式会社日立製作所 | Single-shaft combined cycle power generation facility and operation method thereof |
US8365583B2 (en) * | 2010-03-23 | 2013-02-05 | General Electric Company | Method and system for testing an overspeed protection system of a powerplant machine |
US8756939B2 (en) * | 2010-03-23 | 2014-06-24 | General Electric Company | Method and system for testing an overspeed protection system of a powerplant machine |
FR2962165B1 (en) * | 2010-07-02 | 2014-05-02 | Turbomeca | DETECTION OF OVERSPEED OF FREE TURBINE BY MEASUREMENT ON COUPLER |
-
2013
- 2013-09-17 EP EP13184817.8A patent/EP2848772A1/en not_active Withdrawn
-
2014
- 2014-09-08 KR KR1020167006647A patent/KR101834099B1/en active IP Right Grant
- 2014-09-08 EP EP14771218.6A patent/EP3044428B1/en not_active Not-in-force
- 2014-09-08 WO PCT/EP2014/069071 patent/WO2015039910A1/en active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2015039910A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP3044428B1 (en) | 2019-05-15 |
EP2848772A1 (en) | 2015-03-18 |
KR101834099B1 (en) | 2018-03-02 |
WO2015039910A1 (en) | 2015-03-26 |
KR20160042449A (en) | 2016-04-19 |
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