An ultrasonic sensor for corrosion monitoring of hydrogen-blended natural gas pipelines

Abstract

This invention discloses an ultrasonic sensor for corrosion monitoring of hydrogen-blended natural gas pipelines, belonging to the field of sensor technology. The ultrasonic sensor for corrosion monitoring of hydrogen-blended natural gas pipelines includes: a sensor housing, a longitudinal wave sensor, a transverse wave sensor, and a protective layer; the protective layer is disposed at the bottom of the sensor housing, and the longitudinal wave sensor and the transverse wave sensor are mounted on the side of the protective layer near the inner cavity of the sensor housing. This ultrasonic sensor can reduce the workload of detection, improve detection efficiency, and reduce detection difficulty.

Description

Technical Field

[0001] This utility model relates to the field of sensor technology, specifically to an ultrasonic sensor for monitoring corrosion in natural gas hydrogen-blended pipelines. Background Technology

[0002] Natural gas blending pipelines face safety risks such as hydrogen embrittlement and corrosion. The wall thickness, internal stress, and defects of these pipelines can be assessed using piezoelectric ultrasonic echo detection. Currently, piezoelectric ultrasonic testing technology is widely used in the non-destructive testing of natural gas blending pipelines due to its excellent echo signal and deep detection range. The principle of piezoelectric ultrasonic stress measurement is to use a piezoelectric transducer to excite and receive ultrasonic waves. Stress is then inverted through the acoustoelastic effect, where material stress alters the propagation speed of ultrasonic waves. Its core lies in the high-precision measurement of minute changes in the ultrasonic wave transit time or spectrum caused by stress, followed by rigorous temperature compensation and material calibration before converting these changes into stress values.

[0003] Existing longitudinal wave single-wave piezoelectric ultrasound uses a single piezoelectric ultrasonic probe for measurement. In practice, it is necessary to first measure the waveform and echo of a stress-free and corrosion-free reference block, set the reference, and then inspect the test object. For the inspection environment of natural gas hydrogen-blended pipelines, this method has obvious shortcomings in practical applications. First, due to the curved surface of the hydrogen pipeline, when the testing personnel use traditional manual pressing, the pressure will slip due to the lubrication effect of the coupling agent. The curved surface makes it more difficult for the testing personnel to grasp the pressing direction, which is not conducive to the accuracy of data collection.

[0004] Secondly, when using traditional longitudinal wave single-wave piezoelectric ultrasound for testing, reference data must be collected for objects with different morphologies, materials, and thicknesses, which increases the workload and difficulty of the testing personnel.

[0005] Third, in environments with significant diurnal temperature variations, temperature has a more pronounced impact on detection because the elastic modulus of solid materials changes with temperature (generally, the modulus decreases as temperature increases). Due to the speed of sound... elastic modulus and density Changes in temperature collectively cause changes in the speed of sound. For example, the typical temperature coefficient of sound for steel is approximately -0.04% to -0.06% per degree Celsius. This means that a 10°C change in temperature results in a 0.5% change in the speed of sound, and the resulting change in flight time completely masks the change caused by stress (the magnitude of the change in the speed of sound caused by stress is typically below 0.01%). Traditional single-wavelength sensors lack temperature detection capabilities, which impacts the comprehensive evaluation and analysis of the detection process. Utility Model Content

[0006] The purpose of this invention is to provide an ultrasonic sensor for monitoring corrosion in natural gas hydrogen-blended pipelines, thereby solving at least one of the aforementioned technical problems.

[0007] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: An ultrasonic sensor for corrosion monitoring of hydrogen-blended natural gas pipelines includes: a sensor housing, a longitudinal wave sensor, a transverse wave sensor, and a protective layer; the protective layer is disposed at the bottom of the sensor housing, and the longitudinal wave sensor and the transverse wave sensor are mounted on the side of the protective layer near the inner cavity of the sensor housing.

[0008] Furthermore, the inner cavity of the aforementioned sensor housing is provided with a backing layer by means of injection.

[0009] Furthermore, the aforementioned longitudinal wave sensor is embedded within the transverse wave sensor.

[0010] Furthermore, the ultrasonic sensor described above for monitoring corrosion in hydrogen-blended natural gas pipelines also includes a temperature sensor, which is mounted on the sensor housing and has its probe extending out of the bottom of the sensor housing.

[0011] Furthermore, the sensor housing is provided with a mounting cylinder in the middle, a vacuum push rod is slidably inserted into the top of the mounting cylinder, one end of the vacuum push rod is sealed to the mounting cylinder, a vacuum suction cup is provided at the bottom of the mounting cylinder, and the mounting cylinder is connected to a fixing component for fixing the vacuum push rod at different positions of the mounting cylinder.

[0012] Furthermore, the aforementioned mounting cylinder is integrally formed with the sensor housing.

[0013] Furthermore, the aforementioned fastener is slidably arranged along the radial direction of the mounting cylinder, and the vacuum push rod is provided with at least two limiting holes that cooperate with the fastener.

[0014] Furthermore, the aforementioned sensor housing is connected to a permanent magnet, which extends to a position near the bottom of the sensor housing.

[0015] Furthermore, the aforementioned permanent magnet is sleeved on the outside of the mounting cylinder and connected to the sensor housing, and a vacuum suction cup is embedded between the permanent magnet and the mounting cylinder.

[0016] Furthermore, the aforementioned sensor housing includes a housing and a cover plate that mates with the housing, the cover plate having through holes for wiring.

[0017] This utility model has the following beneficial effects: (1) The ultrasonic sensor of this utility model uses transverse and longitudinal dual-wave sensors for detection. Through mathematical transformation, a mathematical expression that is independent of both longitudinal and transverse wave reference sound velocities can be derived. It is not necessary to know the reference sound velocity of the material under zero stress, that is, it is not necessary to collect the reference signal of stress-free and corrosion-free reference samples, thereby reducing the workload of detection, improving detection efficiency, and reducing detection difficulty.

[0018] (2) The ultrasonic sensor of this utility model is fixed by a combination of vacuum suction cup adsorption and permanent magnet adsorption. This not only enhances the adsorption and fixation effect on the curved pipe surface, but also has a good adsorption and fixation effect in environments where the pipe has a thick coating (environment with poor magnetic adsorption effect), thereby expanding the applicable environment of the sensor.

[0019] (3) This utility model combines a temperature sensor with a horizontal and vertical dual-wave sensor, which is beneficial for testing personnel to make accurate assessments in environments with large temperature changes. Attached Figure Description

[0020] Figure 1 A schematic diagram of the structure of an ultrasonic sensor for corrosion monitoring of hydrogen-blended natural gas pipelines provided in an embodiment of this utility model; Figure 2 This is an exploded structural diagram of an ultrasonic sensor for monitoring corrosion in hydrogen-blended natural gas pipelines, provided in an embodiment of this utility model.

[0021] In the diagram: 10-Sensor housing; 11-Mounting cylinder; 12-Vacuum push rod; 13-Vacuum suction cup; 14-Fixing component; 15-Limiting hole; 16-Permanent magnet; 17-Housing; 18-Cover plate; 19-Through hole; 20-Longitudinal wave sensor; 30-Transverse wave sensor; 40-Protective layer; 50-Temperature sensor. Detailed Implementation

[0022] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0023] like Figure 1 and Figure 2As shown, this embodiment provides an ultrasonic sensor for corrosion monitoring of hydrogen-blended natural gas pipelines, including: a sensor housing 10, a longitudinal wave sensor 20, a transverse wave sensor 30, a protective layer 40, and a temperature sensor 50. This embodiment uses a dual-wave sensor (longitudinal wave sensor 20 and transverse wave sensor 30) for detection. Through mathematical transformation, a mathematical expression independent of both the longitudinal and transverse wave reference velocities can be derived. This eliminates the need to know the reference velocities of the material under zero stress, i.e., it eliminates the need to collect reference signals from stress-free and corrosion-resistant reference samples, thereby reducing the workload, improving detection efficiency, and lowering the detection difficulty. Furthermore, combining the temperature sensor 50 with the dual-wave sensor (longitudinal and transverse waves) facilitates accurate assessment by inspectors in environments with significant temperature variations.

[0024] The sensor housing 10 includes a housing 17 and a cover plate 18 connected to the side of the housing 17. The cover plate 18 can be fixedly connected to the housing 17 by a detachable connection method such as bolting, or by a non-detachable connection method such as welding. The inner cavity of the housing 17 is filled with a backing material to form a backing layer, which not only fixes the components but also eliminates the influence of echoes within the cavity. The longitudinal wave sensor 20 and the transverse wave sensor 30 are located on one side of the bottom of the housing 17, and the temperature sensor 50 is located on the other side of the bottom of the housing 17.

[0025] A protective layer 40 is provided at the bottom of the housing 17. The protective layer 40 is installed at the bottom of the housing 17. The transverse wave sensor 30 is annular, and the longitudinal wave sensor 20 is located inside the transverse wave sensor 30. Both the transverse wave sensor 30 and the longitudinal wave sensor 20 are connected to each other within the protective layer 40 and are located inside the housing 17. The temperature sensor 50 passes through the bottom of the housing 17, and the probe of the temperature sensor 50 extends out of the housing 17.

[0026] In this embodiment, the side wall of the cover plate 18 is provided with a through hole 19 for the routing of the temperature sensor 50, the longitudinal wave sensor 20 and the transverse wave sensor 30.

[0027] To secure the entire ultrasonic sensor, in this embodiment, a mounting cylinder 11 is vertically positioned in the middle of the housing 17. A vacuum push rod 12 slides into the top of the mounting cylinder 11, and a vacuum suction cup 13 is connected to the bottom of the mounting cylinder 11. One end of the vacuum push rod 12 is located inside the mounting cylinder 11 and is sealed to it, while the other end is located outside the mounting cylinder 11. By changing the position of the vacuum push rod 12 within the mounting cylinder 11, the vacuum suction cup 13 can be attracted to the pipe, thereby securing the entire ultrasonic sensor.

[0028] To limit the position of the vacuum push rod 12, the mounting cylinder 11 is connected to a fixing member 14 for fixing the vacuum push rod 12 at different positions on the mounting cylinder 11. The fixing member 14 is slidably arranged along the radial direction of the mounting cylinder 11. The vacuum push rod 12 is provided with at least two limiting holes 15 that cooperate with the fixing member 14. When the fixing member 14 cooperates with different limiting holes 15, the vacuum push rod 12 can be fixed at different positions, thereby realizing the adsorption and de-adsorption of the vacuum suction cup 13. When the vacuum push rod 12 is working, its sealing end will not go beyond the limiting hole 15, ensuring the sealing between the vacuum push rod 12 and the mounting cylinder 11.

[0029] Preferably, the mounting cylinder 11 is integrally formed with the sensor housing 10. More preferably, the bottom of the housing 17 is provided with a notch, from which the mounting cylinder 11 extends.

[0030] To improve the adsorption and fixation ability, in this embodiment, the housing 17 is connected to a permanent magnet 16, which extends to a position near the bottom of the housing 17. Through the dual adsorption of the permanent magnet 16 and the vacuum suction cup 13, not only can the adsorption and fixation effect on the curved pipe surface be enhanced, but it can also have a good adsorption and fixation effect in environments where the pipe has a thick coating (environment with poor magnetic adsorption effect), thereby expanding the applicable environment of the sensor.

[0031] Preferably, the permanent magnet 16 is sleeved on the outside of the mounting cylinder 11 and connected to the sensor housing 10, and the vacuum suction cup 13 is embedded between the permanent magnet 16 and the mounting cylinder 11. This arrangement can improve the adsorption effect of the dual composite adsorption fixation.

[0032] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An ultrasonic sensor for monitoring corrosion in natural gas hydrogen-blended pipelines, characterized in that, include: The sensor housing (10), longitudinal wave sensor (20), transverse wave sensor (30), and protective layer (40) are provided at the bottom of the sensor housing (10), and the longitudinal wave sensor (20) and transverse wave sensor (30) are installed on the side of the protective layer (40) near the inner cavity of the sensor housing (10).

2. The ultrasonic sensor for corrosion monitoring of hydrogen-blended natural gas pipelines according to claim 1, characterized in that, The inner cavity of the sensor housing (10) is provided with a backing layer by means of injection.

3. The ultrasonic sensor for corrosion monitoring of hydrogen-blended natural gas pipelines according to claim 1, characterized in that, The longitudinal wave sensor (20) is embedded in the transverse wave sensor (30).

4. The ultrasonic sensor for corrosion monitoring of hydrogen-blended natural gas pipelines according to claim 1, characterized in that, It also includes a temperature sensor (50) which is mounted on the sensor housing (10) and whose probe extends out of the bottom of the sensor housing (10).

5. The ultrasonic sensor for corrosion monitoring of hydrogen-blended natural gas pipelines according to any one of claims 1 to 4, characterized in that, The sensor housing (10) has a mounting cylinder (11) in the middle. A vacuum push rod (12) is slidably inserted into the top of the mounting cylinder (11). One end of the vacuum push rod (12) is sealed to the mounting cylinder (11). A vacuum suction cup (13) is provided at the bottom of the mounting cylinder (11). The mounting cylinder (11) is connected to a fixing member (14) for fixing the vacuum push rod (12) at different positions of the mounting cylinder (11).

6. The ultrasonic sensor for corrosion monitoring of hydrogen-blended natural gas pipelines according to claim 5, characterized in that, The mounting cylinder (11) is integrally formed with the sensor housing (10).

7. The ultrasonic sensor for corrosion monitoring of hydrogen-blended natural gas pipelines according to claim 5, characterized in that, The fixing member (14) is slidably disposed along the radial direction of the mounting cylinder (11), and the vacuum push rod (12) is provided with at least two limiting holes (15) that cooperate with the fixing member (14).

8. The ultrasonic sensor for corrosion monitoring of a hydrogen-blended natural gas pipeline of claim 7, wherein, The sensor housing (10) is connected to a permanent magnet (16) which extends to a position near the bottom of the sensor housing (10).

9. The ultrasonic sensor for corrosion monitoring of a hydrogen-blended natural gas pipeline of claim 8, wherein, The permanent magnet (16) is sleeved on the outside of the mounting cylinder (11) and connected to the sensor housing (10). The vacuum suction cup (13) is embedded between the permanent magnet (16) and the mounting cylinder (11).

10. The ultrasonic sensor for corrosion monitoring of a hydrogen blended natural gas pipeline of claim 8, wherein, The sensor housing (10) includes a housing (17) and a cover plate (18) that cooperates with the housing (17), the cover plate (18) having through holes (19) for wiring.

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