CN112648022A - Method for preventing turbo generator set from seriously overspeed - Google Patents
Method for preventing turbo generator set from seriously overspeed Download PDFInfo
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- CN112648022A CN112648022A CN202011410045.8A CN202011410045A CN112648022A CN 112648022 A CN112648022 A CN 112648022A CN 202011410045 A CN202011410045 A CN 202011410045A CN 112648022 A CN112648022 A CN 112648022A
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- steam
- steam turbine
- pressure
- turbine
- pressure cylinder
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- 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
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- 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
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- 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
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
- F01D17/12—Final actuators arranged in stator parts
- F01D17/14—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits
- F01D17/141—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path
- F01D17/145—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path by means of valves, e.g. for steam turbines
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- 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
- F01D21/003—Arrangements for testing or measuring
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- 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
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Turbines (AREA)
Abstract
The invention relates to a method for preventing a turbo generator set from seriously overspeed, which comprises the following steps: after the steam turbine is stopped, when the rotating speed is abnormally increased, the high-pressure cylinder vent valve and the drain valve directly connected with the steam cylinder are locked and opened, the pressure in the high-pressure cylinder is prevented from being rapidly reduced, the higher pressure in the high-pressure cylinder is maintained, the blast friction loss of a high-pressure rotor of the steam turbine is increased, and the resistance of the high-pressure rotor of the steam turbine is further increased; after the steam turbine is stopped, immediately opening a condenser vacuum destruction door, reducing the condenser vacuum, and reducing the steam work capacity in a steam turbine intermediate pressure cylinder and a low pressure cylinder; when the turbine is overspeed: opening the emergency relief valve for the superheated steam of the boiler, reducing the steam pressure entering the steam turbine, and reducing the steam quantity leaked to the steam turbine; the low pressure bypass valve and the high pressure bypass valve are opened immediately to reduce the steam pressure entering the steam turbine and reduce the steam amount leaked to the steam turbine. The invention can improve the operation safety of the unit and prevent major equipment damage accidents.
Description
Technical Field
The invention belongs to the technical field of power plant safety production, and particularly relates to a method for preventing a steam turbine generator unit from seriously overspeed.
Background
The phenomena of jamming of a high-medium pressure main throttle valve and a speed regulation throttle valve or jamming, non-tight closing and the like in the shutdown process sometimes exist in the running of the steam turbine generator unit. After the steam turbine generator unit is shut down, if the generator is disconnected from a power grid, the high-medium pressure main throttle valve and the speed regulation throttle valve of the steam turbine are blocked or not tightly closed, high-temperature and high-pressure steam enters the steam turbine to do work, the steam turbine generator unit is overspeed, and a shaft system is broken in serious cases, so that major equipment damage accidents are caused.
At present, the method for processing the accidents in the power plant is to find that the rotating speed of the steam turbine generator unit rises, immediately open the vacuum breaking door to reduce the vacuum of the condenser, but from the opening of the vacuum breaking door to the beginning of the reduction of the vacuum, the time is usually delayed by about 40 seconds, and the time is usually required for 5 minutes until the vacuum is completely reduced to zero, so that the effect of inhibiting the overspeed of the steam turbine generator unit is limited. In addition, after the turbo generator set is shut down, the high-pressure cylinder ventilation valve and the drain valve directly connected with the high-pressure cylinder are opened in an interlocking mode, after the valves are opened, steam remained in the high-pressure cylinder is sucked into the condenser, so that vacuum is formed in the high-pressure cylinder, the blast friction effect of the steam and a turbine rotor is weakened, the resistance to the rotor is reduced, and the overspeed of the turbine is accelerated. At present, no other method for effectively preventing the turbo generator set from seriously overspeed exists.
Disclosure of Invention
The invention aims to provide a method for preventing a turbo generator unit from seriously overspeed, which can quickly inhibit the speed rising rate when the turbo generator unit is overspeed, greatly reduce the risk of the turbo generator unit from seriously overspeed and improve the safety of the turbo generator unit.
The invention provides a method for preventing a turbo generator set from seriously overspeed, which comprises the following steps:
during the running down of the turbine, the resistance of the turbine rotor is increased:
after the steam turbine is stopped, when the rotating speed is abnormally increased, the high-pressure cylinder vent valve and the drain valve directly connected with the steam cylinder are locked and opened, the pressure in the high-pressure cylinder is prevented from being rapidly reduced, the higher pressure in the high-pressure cylinder is maintained, the blast friction loss of a high-pressure rotor of the steam turbine is increased, and the resistance of the high-pressure rotor of the steam turbine is further increased;
after the steam turbine is stopped, immediately opening a condenser vacuum destruction door, reducing the condenser vacuum, and reducing the steam work capacity in a steam turbine intermediate pressure cylinder and a low pressure cylinder;
when the turbine is over-speed, reducing the steam pressure entering the turbine:
opening the emergency relief valve for the superheated steam of the boiler, reducing the steam pressure entering the steam turbine, and reducing the steam quantity leaked to the steam turbine;
the low pressure bypass valve and the high pressure bypass valve are opened immediately to reduce the steam pressure entering the steam turbine and reduce the steam amount leaked to the steam turbine.
Further, the method further comprises:
adding interlocking logic:
when the rotating speed of the steam turbine is higher than 3100rpm, the following equipment is linked:
the boiler MFT is interlocked, the steam pressure entering the steam turbine is reduced, and the steam quantity leaked to the steam turbine is reduced;
the emergency exhaust valve of the boiler is opened in an interlocking manner, so that the steam pressure entering the steam turbine is reduced, and the steam quantity leaked to the steam turbine is reduced;
the vacuum breaking door is opened in an interlocking manner, and the vacuum of the steam turbine is reduced, so that the work quantity of leaked or residual steam in the intermediate pressure cylinder and the low pressure cylinder is reduced;
and the EH oil pump is locked and stopped, and the oil supply of the main throttle valve and the speed regulation throttle valve oil motor of the steam turbine is cut off, so that the main throttle valve and the speed regulation throttle valve are smoothly closed.
By means of the scheme, the method for preventing the turbo generator unit from being overspeed seriously is used for immediately braking the steam turbine rotor when the steam turbine is shut down by increasing the blast friction loss of the high-pressure rotor of the steam turbine when the turbo generator unit is overspeed, so that the risk of the turbo generator unit from being overspeed seriously is greatly reduced, and the method has a great effect on improving the safety of the turbo generator unit. In addition, through increasing the logic of the MFT of the interlocking boiler and the logic of the emergency discharge valve of the interlocking open boiler, the steam inlet pressure of the steam turbine can be timely reduced by interlocking open the vacuum destruction door of the condenser, the amount of steam leaking into the steam turbine is reduced, the work capacity of the steam is reduced, the rising speed of the rotating speed of the steam turbine is relieved, and the time lag caused by manual operation of operators is avoided.
The foregoing is a summary of the present invention, and in order to provide a clear understanding of the technical means of the present invention and to be implemented in accordance with the present specification, the following is a detailed description of the preferred embodiments of the present invention.
Drawings
Fig. 1 is a schematic diagram of the principle of the present invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Referring to fig. 1, the embodiment provides a method for preventing a turbo generator set from severely overspeed, and the specific scheme is as follows:
1. and in the process of the idle running of the turbine, increasing the resistance of the rotor of the turbine (optimizing the interlocking opening logic of the high-pressure cylinder vent valve of the turbine and the opening logic of the drain valve directly connected with the high-pressure cylinder).
After the steam turbine stops, when the rotating speed abnormally rises, the high-pressure cylinder vent valve and the drain valve directly connected with the steam cylinder are locked and opened, the pressure in the high-pressure cylinder is prevented from rapidly dropping, the higher pressure in the high-pressure cylinder is maintained, the blast friction loss of the high-pressure rotor of the steam turbine is increased, and the resistance of the high-pressure rotor of the steam turbine is further increased.
2. And after the steam turbine is stopped, the vacuum destruction door of the condenser is opened immediately, so that the vacuum of the condenser is reduced, and the work capacity of steam in the intermediate pressure cylinder and the low pressure cylinder of the steam turbine is reduced.
3. When the turbine is over-speed, the steam pressure entering the turbine is reduced.
(1) And opening the emergency relief valve for the superheated steam of the boiler, reducing the steam pressure entering the steam turbine and reducing the steam quantity leaked to the steam turbine.
(2) The low pressure bypass valve and the high pressure bypass valve are opened immediately to reduce the steam pressure entering the steam turbine and reduce the steam amount leaked to the steam turbine.
4. Adding interlocking logic:
when the rotating speed of the steam turbine is higher than 3100rpm, the following equipment is linked:
(1) the boiler MFT is interlocked.
(2) The boiler emergency discharge valve is opened in an interlocking manner.
(3) The interlock opens the vacuum break door.
(4) The EH oil pump is interlocked and stopped.
The interlocking opening logic of the high-pressure cylinder vent valve and the interlocking opening of the high-pressure cylinder body drain valve are changed from the original interlocking opening of the turbine tripping to the interlocking opening when the turbine tripping is carried out and the rotating speed is lower than 3000r/min, namely, the high-pressure cylinder vent valve is kept at the closing position when the turbine is overspeed, and the steam pressure in the high-pressure cylinder is prevented from being reduced.
And (4) increasing the logic of interlocking the boiler MFT when the rotating speed of the steam turbine is higher than 3100rpm, and locking the steam turbine when performing an overspeed test. When the steam turbine is overspeed, the steam pressure entering the steam turbine is reduced, and the steam quantity leaking to the steam turbine is reduced.
And when the rotating speed of the steam turbine is increased to be higher than 3100rpm, the logic of the emergency exhaust valve of the boiler is interlocked and opened, and the steam turbine is locked when an overspeed test is carried out. When the steam turbine is overspeed, the steam pressure entering the steam turbine is reduced, and the steam quantity leaking to the steam turbine is reduced.
And (4) increasing the logic of interlocking and opening the vacuum breaking door when the rotating speed of the steam turbine is higher than 3100rpm, and locking the steam turbine when the overspeed test is carried out. When the steam turbine is over-speed, the vacuum of the steam turbine is reduced, so that the work quantity of leaked or residual steam in the intermediate pressure cylinder and the low pressure cylinder is reduced.
And increasing the logic of interlocking and stopping the EH oil pump when the rotating speed of the steam turbine is higher than 3100rpm, and locking the steam turbine when performing an overspeed test. When the turbine is over-speed, the oil supply of the main throttle valve and the speed regulation throttle valve oil motor of the turbine can be reliably cut off, so that the main throttle valve and the speed regulation throttle valve can be smoothly closed.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, it should be noted that, for those skilled in the art, many modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (2)
1. A method of preventing severe overspeed in a turbo-generator set, comprising:
during the running down of the turbine, the resistance of the turbine rotor is increased:
after the steam turbine is stopped, when the rotating speed is abnormally increased, the high-pressure cylinder vent valve and the drain valve directly connected with the steam cylinder are locked and opened, the pressure in the high-pressure cylinder is prevented from being rapidly reduced, the higher pressure in the high-pressure cylinder is maintained, the blast friction loss of a high-pressure rotor of the steam turbine is increased, and the resistance of the high-pressure rotor of the steam turbine is further increased;
after the steam turbine is stopped, immediately opening a condenser vacuum destruction door, reducing the condenser vacuum, and reducing the steam work capacity in a steam turbine intermediate pressure cylinder and a low pressure cylinder;
when the turbine is over-speed, reducing the steam pressure entering the turbine:
opening the emergency relief valve for the superheated steam of the boiler, reducing the steam pressure entering the steam turbine, and reducing the steam quantity leaked to the steam turbine;
the low pressure bypass valve and the high pressure bypass valve are opened immediately to reduce the steam pressure entering the steam turbine and reduce the steam amount leaked to the steam turbine.
2. The method for preventing severe overspeed of a steam turbine generator set according to claim 1, further comprising:
adding interlocking logic:
when the rotating speed of the steam turbine is higher than 3100rpm, the following equipment is linked:
the boiler MFT is interlocked, the steam pressure entering the steam turbine is reduced, and the steam quantity leaked to the steam turbine is reduced;
the emergency exhaust valve of the boiler is opened in an interlocking manner, so that the steam pressure entering the steam turbine is reduced, and the steam quantity leaked to the steam turbine is reduced;
the vacuum breaking door is opened in an interlocking manner, and the vacuum of the steam turbine is reduced, so that the work quantity of leaked or residual steam in the intermediate pressure cylinder and the low pressure cylinder is reduced;
and the EH oil pump is locked and stopped, and the oil supply of the main throttle valve and the speed regulation throttle valve oil motor of the steam turbine is cut off, so that the main throttle valve and the speed regulation throttle valve are smoothly closed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011410045.8A CN112648022A (en) | 2020-12-06 | 2020-12-06 | Method for preventing turbo generator set from seriously overspeed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011410045.8A CN112648022A (en) | 2020-12-06 | 2020-12-06 | Method for preventing turbo generator set from seriously overspeed |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112648022A true CN112648022A (en) | 2021-04-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011410045.8A Pending CN112648022A (en) | 2020-12-06 | 2020-12-06 | Method for preventing turbo generator set from seriously overspeed |
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| CN (1) | CN112648022A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115126552A (en) * | 2022-07-26 | 2022-09-30 | 中国船舶重工集团公司第七0四研究所 | Through-flow valve block structure with safety valve arranged outside machine |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205977283U (en) * | 2016-05-10 | 2017-02-22 | 中国能源建设集团山西省电力勘测设计院有限公司 | Coal -fired power plant's steam turbine dashes changes start -up system |
-
2020
- 2020-12-06 CN CN202011410045.8A patent/CN112648022A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205977283U (en) * | 2016-05-10 | 2017-02-22 | 中国能源建设集团山西省电力勘测设计院有限公司 | Coal -fired power plant's steam turbine dashes changes start -up system |
Non-Patent Citations (3)
| Title |
|---|
| 史政林: "国产600MW超临界机组启动过程振动特性分析", 中国优秀硕士学位论文全文数据库, pages 3 * |
| 杜建桥等: "国产660MW超临界直接空冷机组甩负荷试验分析", 《河北电力技术》, pages 23 * |
| 边久海;张在江;: "浅析汽轮机旁路阀与内漏处理", 科技创新与应用, no. 26 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115126552A (en) * | 2022-07-26 | 2022-09-30 | 中国船舶重工集团公司第七0四研究所 | Through-flow valve block structure with safety valve arranged outside machine |
| CN115126552B (en) * | 2022-07-26 | 2024-06-04 | 中国船舶集团有限公司第七〇四研究所 | Flow valve group structure with safety valve arranged outside machine |
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