Steam turbine valve steam leakage monitoring system

Abstract

The steam leakage monitoring system for the steam turbine valve is applied to the steam turbine valve, the steam turbine valve comprises a flange sealing face and a heat preservation shell wrapping the surface of the steam turbine valve, the system comprises at least one set of temperature measuring units, and each temperature measuring unit comprises a first temperature measuring part and a second temperature measuring part. The first temperature measuring part is arranged on the outer wall of the flange sealing face, the second temperature measuring part is arranged on the surface of the heat preservation shell, and when steam leaks, the temperature of the outer wall of the flange sealing face and the temperature of the outer surface of the heat preservation shell rise abnormally, and at the moment, the control unit receives measurement data of the temperature measuring unit and then sends out an alarm instruction. The alarm device receives an alarm instruction and sends a signal to give an alarm, so that in the initial stage of steam turbine valve leakage, problems can be found in time, leakage alarm is achieved, lagging does not exist, countermeasures are taken in the first time, real-time monitoring and unmanned inspection of a temperature field in a valve area can be achieved, and long-term safe and stable operation of a unit valve is guaranteed. And the safety of the working environment of the user is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of steam turbine fault detection, in particular to a steam turbine valve steam leakage monitoring system. Background Art

[0002] The medium-pressure steam inlet section of the steam turbine in a thermal power plant is equipped with an medium-pressure main steam valve, an medium-pressure regulating valve, etc., and the flange is fastened and sealed to the valve housing by bolts. However, the valve flange fastening bolts may cause damage or loosening of the flange sealing surface due to installation, disassembly, operation, material relaxation, etc., which may cause steam leakage and even serious consequences. For example, on the one hand, it will cause emergency and unplanned shutdown of the unit, resulting in power loss and affecting social production. On the other hand, it may also cause damage to equipment and even endanger personal safety in serious cases.

[0003] Currently, thermal power plants typically rely on routine inspections by maintenance personnel or monitoring methods to macroscopically monitor the operating status of steam valves. However, because the valve flange sealing surfaces are typically covered with insulation and a thin metal casing, especially in supercritical thermal power generators, where the internal operating temperature of the intermediate-pressure steam valves exceeds 600°C, while the outer surface temperature of the insulation casing is below 50°C, a steam leak manifests as a sudden increase in the outer wall temperature and the emission of white smoke from the valve flange sealing surface. Using these detection methods alone, the initial steam leak is small, and the insulation of the insulation casing hinders steam escape, making leaks from the valve flange sealing surface difficult to detect. Furthermore, the intervals between routine inspections by maintenance personnel can lead to undetected steam leaks. Alternatively, the initial temperature fluctuations on the outer insulation casing are minimal, making it difficult for manual or monitoring methods to identify the initial leak as a leak, resulting in a delay in detecting steam leaks. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a steam turbine valve steam leakage monitoring system, which solves the problem that the existing valve leakage cannot be detected in time and has a certain hysteresis.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A steam leakage monitoring system for a steam turbine valve is applied to a steam turbine valve. The steam turbine valve comprises a flange sealing surface and a heat-insulating shell wrapped around the surface of the steam turbine valve.

[0007] At least one set of temperature measuring units, the temperature measuring units comprising a first temperature measuring portion and a second temperature measuring portion, the first temperature measuring portion being provided on the outer wall of the flange sealing surface for real-time monitoring of the surface temperature of the flange sealing surface, and the second temperature measuring portion being provided on the surface of the thermal insulation shell for real-time monitoring of the outer surface temperature of the thermal insulation shell;

[0008] A control unit, configured to receive measurement data from the temperature measuring unit and issue an alarm instruction;

[0009] An alarm device, used to receive an alarm instruction and send out an alarm signal;

[0010] The control unit is communicatively connected with the temperature measuring unit and the alarm device.

[0011] Furthermore, the projections of the first temperature measuring portion and the second temperature measuring portion in each group of the temperature measuring units in the axial direction of the turbine valve overlap.

[0012] Furthermore, the temperature measuring unit and the control unit are connected in a manner of either a high-temperature wire connection or a wireless connection.

[0013] Furthermore, the temperature measuring unit is any one or a combination of thermocouple, thermal resistor and temperature sensor.

[0014] Furthermore, the temperature measuring unit is fixed by any one of metal belt binding, clamping, welding and bonding.

[0015] Furthermore, it also includes a visual detection unit, which includes a plurality of cameras and a monitoring area composed of the monitoring ranges of the plurality of cameras, and the turbine valve is arranged in the monitoring area.

[0016] Furthermore, several of the cameras are located above the steam turbine valve and are distributed at circumferential intervals to form a circular monitoring area.

[0017] Furthermore, the rotation angle of the plurality of cameras in the horizontal direction is 0 to 360 degrees, and the rotation angle in the vertical direction is -5 to 90 degrees.

[0018] Furthermore, the alarm device is an audible and visual alarm device.

[0019] Furthermore, it also includes a transmission line, which includes at least a switch, a network cable and a VGA cable. The transmission line is used to communicatively connect the control unit with the temperature measuring unit and the alarm device.

[0020] In summary, compared with the prior art, the present invention has at least the following beneficial effects:

[0021] The utility model is applied to a steam turbine valve, which includes a flange sealing surface and a heat-insulating shell wrapped around the surface of the steam turbine valve. The system includes at least one group of temperature measuring units, and the temperature measuring unit includes a first temperature measuring part and a second temperature measuring part. The first temperature measuring part is arranged on the outer wall of the flange sealing surface, and the second temperature measuring part is arranged on the surface of the heat-insulating shell. When steam leaks, the temperature of the outer wall of the flange sealing surface and the outer surface of the heat-insulating shell will rise abnormally. At this time, the control unit sends an alarm instruction after receiving the measurement data of the temperature measuring unit, and the alarm device receives the alarm instruction and sends a signal to alarm, so that in the early stage of the turbine valve leakage, that is, when the steam leakage amount is small, the problem can be discovered in time to make a leakage alarm without hysteresis, so that countermeasures can be taken at the first time to avoid further expansion of the leakage, effectively reducing economic losses, and realizing real-time monitoring of the temperature field in the valve area and unmanned inspection, ensuring the long-term safe and stable operation of the unit valve, and improving the safety of the user's working environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 This is a structural schematic diagram of a steam leakage monitoring system for a steam turbine valve provided in one embodiment of the present utility model.

[0024] Figure 2 This is a schematic cross-sectional view of the installation position of a temperature measuring unit provided in one embodiment of the present invention.

[0025] Figure 3 This is a structural diagram of a visual detection unit provided in one embodiment of the present invention.

[0026] Description of reference numerals:

[0027] 1. Temperature measuring unit; 11. First temperature measuring part; 12. Second temperature measuring part;

[0028] 2. Control unit;

[0029] 3. Alarm device;

[0030] 4. Visual inspection unit; 41. Camera;

[0031] 5. Steam turbine valve; 51. Flange sealing surface; 52. Insulation casing. DETAILED DESCRIPTION

[0032] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0033] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0035] As attached Figure 1 and attached Figure 2As shown, the embodiment of the present invention discloses a steam leakage monitoring system for a steam turbine valve, which is applied to a steam turbine valve 5. The steam turbine valve 5 includes a flange sealing surface 51 and a heat-insulating shell 52 wrapped around the surface of the steam turbine valve 5, and includes at least one set of temperature measuring units 1. The temperature measuring unit 1 includes a first temperature measuring part 11 and a second temperature measuring part 12. The first temperature measuring part 11 is arranged on the outer wall of the flange sealing surface 51 for real-time monitoring of the surface temperature of the flange sealing surface 51. The second temperature measuring part 12 is arranged on the surface of the heat-insulating shell 52 for real-time monitoring of the outer surface temperature of the heat-insulating shell 52. Furthermore, since the flange sealing surface 51 needs to be fixed to the steam turbine valve 5 by bolts, In the working condition of the turbine valve 5, the actual operating temperature of the bolt can reflect whether the bolt is within the normal operating temperature range. If the temperature of the bolt is too high or too low, its material properties will change, which will in turn affect the tightness and sealing of the connecting flange sealing surface 51. Therefore, the temperature measuring unit 1 of the bolt also has the ability to monitor the actual operating temperature of the bolt on the flange sealing surface 51 to provide a basis for the service safety assessment of the bolt material; the control unit 2 is used to receive the measurement data of the temperature measuring unit 1 and issue an alarm instruction; the alarm device 3 is used to receive the alarm instruction and send a signal to alarm; the control unit 2 is communicatively connected with the temperature measuring unit 1 and the alarm device 3.

[0036] Specifically, when steam leaks from the flange sealing surface 51, the internal operating temperature of the turbine valve 5 exceeds 600°C, and the temperature of the steam leaked from the flange sealing surface 51 is relatively high, causing the temperature of the flange sealing surface 51 to rise abnormally. The first temperature measuring unit 11 provided on the outside of the flange sealing surface 51 will detect the temperature change in real time to discover the steam leakage as soon as possible. When an abnormal temperature signal is detected, it is transmitted to the alarm device 3 through the control unit 2 to cause it to issue a first alarm instruction. Moreover, as the leakage continues, the leaked steam may gradually affect the temperature of the insulation shell 52, causing its temperature to change as well. The second temperature measuring unit 12 provided on the surface of the insulation shell 52 will transmit the abnormal temperature signal to the alarm device 3 through the control unit 2 to cause it to issue a second alarm instruction. The alarm device 3 receives the alarm instruction and sends a signal to alarm. The first alarm instruction and the second alarm instruction can be expressed by the alarm device 3 in different forms such as different color changes, tones and frequencies, which are not limited here. The staff judges the steam leakage situation according to the different alarm instruction prompts and makes different countermeasures and responses. The utility model can timely discover the problem and make a leakage alarm at the early stage of the leakage of the turbine valve 5, that is, when the steam leakage is small, without hysteresis, so that countermeasures can be taken at the first time to avoid further expansion of the leakage, reduce energy waste and damage to the turbine equipment, and effectively reduce economic losses. It can also realize real-time monitoring of the temperature field in the valve area and unmanned inspection, ensure the long-term safe and stable operation of the unit valve, and improve the safety of the user's working environment.

[0037] Furthermore, as attached Figure 2 As shown, the number of groups of temperature measuring units 1 is at least one, preferably evenly spaced, to provide more comprehensive temperature monitoring of the turbine valve 5. The specific selection depends on the user's actual usage and the application scenario of the temperature measuring unit 1, and is not limited here. Preferably, the temperature measuring unit 1 is set to 4 groups to facilitate accurate positioning of the leak point.

[0038] Furthermore, the alarm device 3 can be installed in an office area or a turbine operating area. Similarly, multiple alarm devices 3 can be installed, and they can receive alarm signals and issue alarms through a communication connection with the control unit 2. Those skilled in the art can select and adjust the location and number of the alarm devices 3 according to actual application conditions, and this is not limited here.

[0039] In certain embodiments of the present invention, in order to further more accurately compare the temperature changes of different parts of the same position of the steam turbine valve 5, it is helpful to more accurately determine the location and extent of steam leakage. Figure 2 As shown, the installation areas of the first temperature measuring part 11 and the second temperature measuring part 12 in each set of temperature measuring units 1 correspond to each other, that is, the axial projections of the vertical section of the turbine valve 5 coincide, which effectively improves the accuracy and reliability of the monitoring system.

[0040] In certain embodiments of the present invention, the connection method between the temperature measuring unit 1 and the control unit 2 is any one of a high-temperature wire connection and a wireless connection. Specifically, in situations where the signal transmission stability is required to be high and the environmental interference is small, it is preferred to use a high-temperature wire for communication connection to ensure stable data transmission and ensure the accuracy and reliability of monitoring; in monitoring scenarios where the installation space is limited and wiring is difficult, it is preferred to use a wireless connection to reduce the installation difficulty of the temperature measuring unit 1. Those skilled in the art can select the communication connection method between the temperature measuring unit 1 and the control unit 2 according to the actual installation scenario and actual conditions, and no limitation is made here. Preferably, the first temperature measuring part 11 is connected wirelessly to ensure that the structure of the thermal insulation shell 52 is not damaged, and the second temperature measuring part 12 is connected to the control unit 2 via a high-temperature wire.

[0041] In certain embodiments of the present invention, the temperature measuring unit 1 is any one or a combination of thermocouples, thermal resistors and temperature sensors to enhance the versatility of the system. Those skilled in the art can select the type of temperature measuring unit 1 according to actual conditions, and no limitation is made here.

[0042] In certain embodiments of the present invention, the temperature measuring unit 1 is fixed by any one of metal strapping, clamping, welding and bonding. Specifically, when the surface shape of the temperature measuring point at the flange sealing surface 51 of the turbine valve 5 is irregular or the temperature measuring point needs to be adjusted frequently, the preferred fixing method is metal strapping to facilitate installation and adjustment; when the turbine is large and mechanical vibration occurs during operation, the preferred fixing method is clamping to prevent the temperature measuring unit 1 from falling off or shifting; when the turbine valve 5 needs to be in a high-pressure environment or for long-term operation, the preferred fixing method is welding to maintain a stable measuring position; when the turbine valve 5 has special requirements for non-destructive installation, the preferred fixing method is bonding. It is worth noting that the adhesive needs to have high temperature resistance and corrosion resistance to adapt to the working environment of the turbine valve 5. Those skilled in the art can select the fixing method of the temperature measuring unit 1 according to actual usage conditions, and this is not limited here.

[0043] In certain embodiments of the present invention, as shown in the attached Figure 3 As shown, in order to more accurately monitor the steam leakage point, a visual detection unit 4 is further provided in the monitoring system. The visual detection unit 4 includes a plurality of cameras 41 and a monitoring area composed of the monitoring ranges of the plurality of cameras 41. The turbine valve 5 is arranged in the monitoring area.

[0044] Specifically, the visual inspection unit 4 can determine the specific location of the flange sealing surface 51 leak based on the captured thermal signal or light signal. In addition, when the flange sealing surface 51 leaks, white smoke will float out. After a period of leakage, the white smoke can float out through the thermal insulation shell 52. The image captured in real time by the camera 41 will show obvious white smoke floating out or abnormal airflow. When an abnormal situation appears in the image, it is transmitted to the alarm device 3 through the control unit 2 to cause it to issue a third alarm instruction. The third alarm instruction is displayed in a different form from the first alarm instruction and the second alarm instruction. When the third alarm instruction appears, it indicates that the steam leak has been going on for a period of time and the staff needs to take corresponding emergency maintenance measures based on this situation. It should be noted that the above-mentioned related image recognition technology is existing technology and will not be described in detail here. In the present utility model, the visual inspection unit 4 is combined with the temperature measurement unit 1 to achieve comprehensive monitoring of the flange sealing surface 51 of the turbine valve 5, further and more intuitively determine the location and extent of the flange sealing surface 51 leakage, or, when one of the detection means fails, the other detection means can continue to work unaffected, thereby improving the stability of the monitoring system. Preferably, the purchased camera 41 has optical imaging and infrared imaging functions to ensure that the steam turbine valve 5 can be monitored under any environmental conditions. It is worth noting that the model of the camera 41 is not limited.

[0045] In certain embodiments of the present invention, several cameras 41 are located above the turbine valve 5 and are distributed at circumferential intervals to form a circular monitoring area, so as to achieve all-round monitoring of the turbine valve 5 without blind spots, avoiding the occurrence of monitoring blind spots. The images taken from different angles by several cameras 41 can more quickly and accurately determine the specific location of the leakage point.

[0046] In certain embodiments of the present invention, due to varying installation locations and operating environments, and in order to adapt to various complex installation conditions, it is necessary to adjust the angle of the camera 41 to obtain the optimal monitoring area. Therefore, the cameras 41 are configured to rotate horizontally from 0° to 360° and vertically from -5° to 90°, ensuring flexible switching to the desired monitoring range. This allows for adaptability to turbine valves 5 of varying models and specifications, thereby enhancing the versatility of the monitoring system.

[0047] In some embodiments of the present invention, the alarm device 3 is an audible and visual alarm device. When receiving the alarm signal from the control unit 2, the audible and visual alarm device releases audible and visual alarm signals simultaneously.

[0048] In certain embodiments of the present invention, in order to ensure the stability and reliability of the communication connection between the control unit 2 and the temperature measuring unit 1 and the alarm device 3, the monitoring system also includes a transmission line, which includes at least a switch, a network cable and a VGA cable.

[0049] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and replacements made by technicians in this field on the basis of the present invention fall within the scope of protection required by the present invention.

Claims

1. A steam turbine valve steam leakage monitoring system, applied to a steam turbine valve, wherein the steam turbine valve comprises a flange sealing surface and a heat-insulating shell wrapped around the surface of the steam turbine valve, characterized in that: include At least one set of temperature measuring units, the temperature measuring units comprising a first temperature measuring portion and a second temperature measuring portion, the first temperature measuring portion being provided on the outer wall of the flange sealing surface for real-time monitoring of the surface temperature of the flange sealing surface, and the second temperature measuring portion being provided on the surface of the thermal insulation shell for real-time monitoring of the outer surface temperature of the thermal insulation shell; A control unit, configured to receive measurement data from the temperature measuring unit and issue an alarm instruction; An alarm device, used to receive an alarm instruction and send out an alarm signal; The control unit is communicatively connected with the temperature measuring unit and the alarm device.

2. The steam turbine valve steam leakage monitoring system according to claim 1, characterized in that: The projections of the first temperature measuring portion and the second temperature measuring portion in each group of the temperature measuring units in the axial direction of the steam turbine valve overlap.

3. The steam turbine valve steam leakage monitoring system according to claim 1, characterized in that: The temperature measuring unit and the control unit are connected in a manner of high-temperature wire connection or wireless connection.

4. The steam turbine valve steam leakage monitoring system according to claim 1, characterized in that: The temperature measuring unit is a thermocouple or a thermal resistor.

5. The steam turbine valve steam leakage monitoring system according to claim 1, characterized in that: The temperature measuring unit is fixed by any one of metal belt binding, clamping, welding and bonding.

6. The steam turbine valve steam leakage monitoring system according to claim 1, characterized in that: It also includes a visual detection unit, which includes several cameras and a monitoring area composed of the monitoring ranges of the several cameras, and the turbine valve is arranged in the monitoring area.

7. The steam turbine valve steam leakage monitoring system according to claim 6, characterized in that: Several cameras are located above the steam turbine valve and are distributed at circumferential intervals to form a circular monitoring area.

8. The steam turbine valve steam leakage monitoring system according to claim 7, characterized in that: The rotation angle of the plurality of cameras in the horizontal direction is 0 to 360 degrees, and the rotation angle in the vertical direction is -5 to 90 degrees.

9. The steam turbine valve steam leakage monitoring system according to claim 1, characterized in that: The alarm device is an audible and visual alarm device.

10. The steam turbine valve steam leakage monitoring system according to claim 1, characterized in that: It also includes a transmission line, which includes at least a switch, a network cable and a VGA cable. The transmission line is used to connect the control unit with the temperature measuring unit and the alarm device for communication.

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