Hydrogen leakage detection device for sealing pad of hydrogen-cooled generator

Abstract

The utility model discloses a hydrogen leakage detection device for a hydrogen-cooled generator sealing pad, and the device comprises a sealing pad installation seat which is fixed on a generator end cover; the sealing tile is in sealing connection with the generator shaft neck, and the sealing tile is embedded into the sealing tile mounting seat and is in close fit with the sealing tile mounting seat; a plurality of tile seat measuring points are arranged on the sealing tile mounting seat, and a plurality of tile measuring points are arranged on the sealing tile. According to the hydrogen leakage detection device, the detection points are directly arranged at the points, prone to leakage, of the sealing tile and the sealing tile installation base, hydrogen leakage is detected, historical data are compared, whether equipment breaks down or not is accurately judged, and a reliable basis is provided for operation decision making.

Description

Technical Field

[0001] This utility model relates to the field of hydrogen leakage detection technology for generators, and in particular to a hydrogen leakage detection device for sealing tiles of hydrogen-cooled generators. Background Technology

[0002] Currently, the main cooling methods for large-capacity generator sets worldwide are air cooling, hydrogen cooling, liquid cooling, and evaporative cooling. Among them, especially the large thermal power generator sets newly added in China in recent years, are basically all hydrogen-cooled. Hydrogen-cooled units have advantages such as small size, low material consumption, high heat exchange efficiency, and low loss, and are therefore widely used.

[0003] Although sealing oil is used to seal the hydrogen cooling system, hydrogen leakage is inevitable due to dynamic and static gaps and fluctuations in sealing oil pressure. The current leak detection method involves first using a hydrogen leak meter to determine the approximate leak area, and then using foam water to detect the specific leak point within the approximate leak area. This method is not only inefficient and time-consuming, but also prone to missing leaks inside the generator, especially those at the sealing tiles of hydrogen-cooled generator sets. These leaks cannot be detected directly or in advance and can only be indirectly judged by the pressure of the sealing oil and the pressure of the balance valve. Due to the insufficient accuracy of the pressure gauge and the indirect method of judging hydrogen leaks, by the time a drop in oil pressure is detected, the amount of hydrogen leaking from the sealing tile or sealing tile mounting base is already large. At this time, the unit lacks time for maintenance and repair, and an emergency shutdown is necessary. This not only wastes the working fluid, but also poses a great threat to production safety.

[0004] In view of this, the present application aims to develop a hydrogen leakage detection device for sealing tiles of hydrogen-cooled generators to solve the above-mentioned problems. Utility Model Content

[0005] The technical problem this application aims to solve is that the sealing tile of the hydrogen-cooled generator is installed inside the sealing tile mounting base, which in turn is installed inside the generator end cover. When the generator is rotating, it is impossible to directly measure the hydrogen leakage of the sealing tile and the sealing tile mounting base.

[0006] To address the aforementioned technical problems, this application provides a hydrogen leakage detection device for a sealing tile of a hydrogen-cooled generator, comprising: a sealing tile mounting base fixed to the generator end cover; a sealing tile sealingly connected to the generator journal, the sealing tile being embedded in the sealing tile mounting base and tightly fitted; wherein, the sealing tile mounting base is provided with several tile seat measuring points, and the sealing tile is provided with several tile measuring points, both the tile seat measuring points and the tile measuring points being connected to a metal pipe via a sealed joint, the metal pipe leading the gas out of the generator end cover through a conduit; the conduit connecting to a hydrogen concentration detection device; and the hydrogen concentration detection device connected to a control cabinet via a signal cable.

[0007] According to an embodiment of this application, the catheter is a flexible hose.

[0008] According to an embodiment of this application, the sealing tile mounting base is horizontally split, and several tile measuring points are located at the 9 o'clock, 12 o'clock and 3 o'clock positions of the sealing tile mounting base.

[0009] According to an embodiment of this application, the location of the test point can also be set at the two oil inlets at the lower part of the sealing tile mounting base.

[0010] According to an embodiment of this application, the sealing tile mounting base is circular, and the positions of several tile base measuring points are respectively located at the 12 o'clock, 3 o'clock, 5 o'clock, 7 o'clock and 9 o'clock directions of the sealing tile mounting base.

[0011] According to an embodiment of this application, the signal cable is installed inside a cable protection sleeve.

[0012] According to an embodiment of this application, the control cabinet includes a signal control unit, and a hydrogen concentration detection device is connected to the signal control unit and sends the detection result to the signal control unit.

[0013] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0014] 1. This application addresses hydrogen-cooled generator sets operating online. A suitable location is found near the sealing tile and its mounting base to set up a hydrogen leakage sampling point. The sampling point is led out of the generator end cover, and the hydrogen content is measured outside the generator. The measurement data is sent to the power plant control system for detection and comparison, allowing for proactive measures to be taken to avoid emergency shutdown of the unit.

[0015] 2. By adopting this utility model, the setting of these measuring points also facilitates the airtightness test of the generator set after maintenance, which can help determine the accurate location of the hydrogen leakage point of the generator set, detect hydrogen leakage in time, and effectively monitor the hydrogen leakage of the hydrogen-cooled generator set.

[0016] 3. This utility model sets hydrogen leakage monitoring points in the generator sealing tile and the sealing tile mounting base to detect hydrogen leakage. The use of this system greatly facilitates the on-site staff in judging the hydrogen leakage points inside the generator, enabling them to more accurately locate the leakage point, allowing the staff to take emergency measures in a timely manner, prevent accidents, and ensure production safety. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings of the embodiments will be briefly described below. Obviously, the drawings described below only relate to some embodiments of this application, and are not intended to limit this application.

[0018] Figure 1This is a schematic diagram of one embodiment of a hydrogen leakage detection device for a sealing tile of a hydrogen-cooled generator according to the present invention.

[0019] The annotations in the attached figures are explained as follows:

[0020] 1. Hydrogen concentration detection device; 2. Oil inlet; 10. Sealing tile mounting base; 11. First tile mounting point; 12. Second tile mounting point; 13. Third tile mounting point; 14. Fourth tile mounting point; 15. Fifth tile mounting point; 20. Sealing tile; 21. First tile mounting point; 22. Second tile mounting point; 23. Third tile mounting point; 30. Generator end cover. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the described embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this application pertains. The terms “first,” “second,” and similar terms used in the specification and claims of this patent application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an” or “a,” and similar terms, do not indicate a limitation of quantity, but rather indicate the presence of at least one.

[0023] like Figure 1 As shown, this utility model provides a hydrogen leakage detection device for a sealing tile 20 of a hydrogen-cooled generator, comprising: a sealing tile 20 mounting base 10, fixed on the generator end cover 30; and a sealing tile 20, sealingly connected to the generator journal, the sealing tile 20 being embedded in the sealing tile mounting base 10 and tightly fitted. Traditional generator sets cannot directly measure and judge hydrogen leakage from the sealing tile 20 and the sealing tile mounting base 10; they can only indirectly judge based on the overall hydrogen leakage of the unit and the sealing oil pressure, which is often unreliable. This application uses a method of directly setting measuring points at the easily leaking points of the sealing tile 20 and the sealing tile mounting base 10 to detect hydrogen leakage, and comparing historical data to accurately determine whether the equipment has malfunctioned, providing a reliable basis for operational decisions.

[0024] In this embodiment, the sealing tile mounting base 10 is provided with several tile base measuring points, and the sealing tile 20 is provided with several tile measuring points. Both the tile base measuring points and the tile measuring points are connected to a metal pipe by a sealing joint. The metal pipe leads the gas out of the generator end cover 30 through a conduit. The conduit is connected to the hydrogen concentration detection device 1.

[0025] Specifically, the sealing tile mounting base 10 is horizontally split, with several tile measuring points located at the 9 o'clock, 12 o'clock, and 3 o'clock positions on the sealing tile mounting base 10. The tile measuring points can also be located at the two oil inlets 2 at the lower part of the sealing tile mounting base 10.

[0026] Specifically, the sealing tile mounting base 10 is circular, and the positions of several tile base measuring points are located at the 12 o'clock, 3 o'clock, 5 o'clock, 7 o'clock and 9 o'clock directions of the sealing tile mounting base 10.

[0027] In this embodiment, the hydrogen concentration detection device 1 is connected to the control cabinet via a signal cable.

[0028] Specifically, the control cabinet includes a signal control unit, and the hydrogen concentration detection device 1 is connected to the signal control unit and sends the detection results to the signal control unit.

[0029] Specifically, the conduit is a flexible hose, which facilitates the layout and operation of the motor pipeline.

[0030] Specifically, the signal cable is installed inside a cable protection sleeve.

[0031] Example 1

[0032] Several typical locations were selected on the generator sealing tile 20 and the sealing tile mounting base 10 to install hydrogen leakage sampling points: First, the 9 o'clock, 12 o'clock, and 3 o'clock positions on the sealing tile 20. Second, since the sealing tile base is horizontally split, sampling points were also installed at the 9 o'clock, 12 o'clock, and 3 o'clock positions on the sealing tile mounting base 10. Considering that there are two oil inlets 2 at the bottom of the sealing tile mounting base 10 that are prone to hydrogen leakage, sampling points were also arranged at these two locations. The sampling points on the sealing tile base 10 are located at the 12 o'clock, 3 o'clock, 5 o'clock, 7 o'clock, and 9 o'clock positions.

[0033] The hydrogen content detection data from each measuring point are centrally sent to the power plant control cabinet for detection and judgment. The specific judgment method is as follows:

[0034] The arithmetic mean of the hydrogen gas measurements at the first measuring point 21, the second measuring point 22, and the third measuring point 23 is taken as the hydrogen leakage value of the sealing tile 20, which is used for comparative analysis with historical data. The measurement data at the three measuring points are also compared separately. If the hydrogen leakage at one measuring point is significantly larger than that at the other two measuring points, the measurement values ​​at the corresponding measuring points of the sealing tile 20 can be compared and analyzed; otherwise, it is judged as faulty data and discarded.

[0035] The arithmetic mean of the hydrogen gas measurements at the first bearing seat measuring point 11, the second bearing seat measuring point 12, and the third bearing seat measuring point 13 is taken as the hydrogen leakage value of the sealing tile 20, which is used for comparative analysis with historical data. The measurement data of the three measuring points are also compared separately. If the hydrogen leakage at one measuring point is significantly larger than that at the other two measuring points, the measurement value at the corresponding sealing tile 20 measuring point can be compared and analyzed; otherwise, it is judged as faulty data and discarded.

[0036] The fourth bearing seat measuring point 14 and the fifth bearing seat measuring point 15 correspond to the hydrogen leakage at the oil inlet 2 of the sealing bearing seat 10. If the sealing gasket of the sealing bearing seat 10 is damaged, the hydrogen leakage will surge. Therefore, the measured values ​​of these two points are analyzed and compared separately.

[0037] If the measured values ​​of sealing tile 20 or sealing tile mounting base 10 gradually increase, it indicates a hydrogen leak at that location. The specific leak point can be confirmed by referring to the change values ​​at the measuring points. Whether to shut down for maintenance depends on the total hydrogen leak of the entire generator set. If the total hydrogen supply to the generator set is small and greater than the measured values ​​of sealing tile 20 and sealing tile mounting base 10, then observation and operation can be considered. If the total hydrogen supply to the generator set is large, the hydrogen leak is close to the measured values ​​of sealing tile 20 and sealing tile mounting base 10, and no obvious hydrogen leak is found outside the generator set, then sealing tile 20 or sealing tile mounting base 10 has leaked, and immediate shutdown for maintenance is required.

[0038] The working principle of the hydrogen leakage detection device for the sealing tile 20 of a hydrogen-cooled generator according to this application is as follows: Since the sealing tile 20 is installed inside the generator end cover 30, it cannot be directly observed and measured. This application adopts a method of finding a suitable position near the sealing tile 20 and the sealing tile mounting base 10 to set up a hydrogen leakage sampling point; the sampling point is led out of the generator end cover 30, and the hydrogen content is measured outside the generator; the measurement data is sent to the power plant control system for detection and comparison; when the detection data is found to be higher than the historical data or to increase sharply, measures can be taken in advance according to the situation to avoid emergency shutdown of the unit.

[0039] In summary, the technical solution of this application has the following beneficial effects:

[0040] 1. This application addresses hydrogen-cooled generator sets operating online. A suitable location is found near the sealing tile and its mounting base to set up a hydrogen leakage sampling point. The sampling point is led out of the generator end cover, and the hydrogen content is measured outside the generator. The measurement data is sent to the power plant control system for detection and comparison, allowing for proactive measures to be taken to avoid emergency shutdown of the unit.

[0041] 2. By adopting this utility model, the setting of these measuring points also facilitates the airtightness test of the generator set after maintenance, which can help determine the accurate location of the hydrogen leakage point of the generator set, detect hydrogen leakage in time, and effectively monitor the hydrogen leakage of the hydrogen-cooled generator set.

[0042] 3. This utility model sets hydrogen leakage monitoring points in the generator sealing tile and the sealing tile mounting base to detect hydrogen leakage. The use of this system greatly facilitates the on-site staff in judging the hydrogen leakage points inside the generator, enabling them to more accurately locate the leakage point, allowing the staff to take emergency measures in a timely manner, prevent accidents, and ensure production safety.

[0043] The above are merely exemplary embodiments of this application and are not intended to limit the scope of protection of this application, which is determined by the appended claims.

Claims

1. A hydrogen leakage detection device for sealing tiles of hydrogen-cooled generators, characterized in that, include: The sealing tile mounting bracket is fixed to the generator end cover; A sealing tile is used to seal the generator journal, and the sealing tile is embedded in the sealing tile mounting base and fits tightly. The sealing tile mounting base is provided with several tile base measuring points, and the sealing tile is provided with several tile measuring points. Both the tile base measuring points and the tile measuring points are connected to a metal pipe by a sealing joint. The metal pipe leads the gas out of the generator end cover through a conduit. The conduit is connected to a hydrogen concentration detection device. The hydrogen concentration detection device is connected to the control cabinet via a signal cable.

2. The hydrogen leakage detection device for sealing tiles of a hydrogen-cooled generator according to claim 1, characterized in that, The catheter is a flexible tube.

3. The hydrogen leakage detection device for sealing tiles of a hydrogen-cooled generator according to claim 1, characterized in that, The sealing tile mounting base is horizontally split, and several of the tile measuring points are located at the 9 o'clock, 12 o'clock and 3 o'clock positions of the sealing tile mounting base.

4. A hydrogen leakage detection device for a sealing tile of a hydrogen-cooled generator according to claim 3, characterized in that, The measuring point of the sealing tile can also be set at the two oil inlets at the bottom of the sealing tile mounting base.

5. A hydrogen leakage detection device for a sealing tile of a hydrogen-cooled generator according to claim 1, characterized in that, The sealing tile mounting base is circular, and the positions of several measuring points on the tile base are respectively located at the 12 o'clock, 3 o'clock, 5 o'clock, 7 o'clock and 9 o'clock directions of the sealing tile mounting base.

6. A hydrogen leakage detection device for a sealing tile of a hydrogen-cooled generator according to claim 1, characterized in that, The signal cable is installed inside a cable protection sleeve.

7. A hydrogen leakage detection device for a sealing tile of a hydrogen-cooled generator according to claim 1, characterized in that, The control cabinet includes a signal control unit, and the hydrogen concentration detection device is connected to the signal control unit and sends the detection result to the signal control unit.

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