Corrosion monitoring device and method for sealing steel plate of underground gas storage

Abstract

The invention discloses an underground gas storage sealing steel plate corrosion monitoring device and method. The device comprises an ultrasonic probe and a processor; the underground gas storage comprises a tubular sealing steel plate, and the ultrasonic probe is mounted on the inner side wall of the sealing steel plate; the ultrasonic probe comprises a plurality of ultrasonic probe groups arranged at intervals in the axial direction of the sealing steel plate, each ultrasonic probe group comprises a plurality of ultrasonic probe units arranged at intervals in the circumferential direction of the sealing steel plate, and the processor is electrically connected with the ultrasonic probe units; the ultrasonic probe unit is configured to receive and transmit signals. Compared with the prior art, the corrosion of the sealing steel plate of the underground gas storage can be monitored in real time and for a long time, and the corrosion core area and the corrosion degree of the sealing steel plate can be determined, so that the corrosion area of the sealing steel plate of the gas storage cavern can be repaired and maintained in a targeted manner; therefore, the safety and stability of the gas storage cavern in the operation period are ensured, the detection is continuous, the cost is low, the intelligence is high, and the real-time performance of the detection result is good.

Description

Technical Field

[0001] The present invention relates to the technical field of corrosion detection, and in particular to a device and method for monitoring corrosion of a sealing steel plate of an underground gas storage reservoir. Background Art

[0002] Compressed air energy storage is a technology that uses compressed air as a medium to store energy and generate electricity. Currently, salt caverns and artificially excavated caverns are commonly used as gas storage containers. For the construction of new underground gas storage in artificially excavated caverns, air tightness and stability are key technical difficulties. At present, steel-lined concrete structural sealing systems are often used. However, the steel lining of the underground gas storage is located in a high-pressure and humid environment, and the corrosion problem of the steel lining cannot be ignored. At present, the commonly used anti-corrosion method for steel-lined concrete is to cover the surface with anti-corrosion coatings, and the steel plate generally has a corrosion margin of more than 1mm. At present, domestic standards require that the design service life of anti-corrosion coatings generally does not exceed 20 years. If monitoring and repainting are not carried out during the operation period, it is difficult to meet the service life of the gas storage. The corrosion margin of the sealed steel plate is invisible and uncontrollable during the operation period. Its corrosion detection is generally based on manual detection under maintenance conditions. At present, there is no precise and intelligent means to monitor it in real time.

[0003] At present, the conventional detection methods for steel plate corrosion detection include ultrasonic thickness measurement, resistance method, hanging piece weight loss method, etc., and new detection methods include FSM field fingerprint method, resistance probe method, etc. The ultrasonic thickness measurement method uses the characteristics of ultrasonic waves passing through materials and measuring echoes to detect the wall thickness and corrosion of materials. By measuring the time or amplitude change of sound wave propagation, the thickness or corrosion degree of the material can be determined; the resistance method monitors the corrosion rate by measuring the change in the resistance of the metal sample; the hanging piece weight loss method places the corrosion hanging piece inside the pipeline or equipment, takes out the hanging piece after a certain period of time for cleaning and precision weighing, and indirectly infers the corrosion of the inner wall of the pipeline or equipment by calculating the corrosion amount and rate of the corrosion hanging piece; the FSM field fingerprint method arranges an electrode matrix on the outside of the pipeline, sets a constant excitation current in the monitoring area, and analyzes the resistance change through the electrode matrix voltage distribution to reflect the degree of corrosion; the resistance probe method uses a resistance probe to measure the change in the resistance of the corroded metal during the corrosion process to obtain its corrosion amount and corrosion rate. The above existing detection methods are all manual detection under the pressure relief conditions of regular maintenance conditions, and there are problems such as discontinuous detection, high cost, low intelligence, and poor real-time detection results. Summary of the invention

[0004] The present application provides a device and method for monitoring the corrosion of sealing steel plates in underground gas storage reservoirs, so as to solve the problems of discontinuous detection, high cost, low intelligence and poor real-time detection results in the existing methods for monitoring the corrosion of sealing steel plates in underground gas storage reservoirs.

[0005] In order to achieve the above-mentioned purpose, this application adopts the following technical solution.

[0006] On the one hand, a corrosion monitoring device for a sealing steel plate of an underground gas storage reservoir is provided, comprising an ultrasonic probe and a processor; the underground gas storage reservoir comprises a tubular sealing steel plate, and the ultrasonic probe is installed on the inner wall of the sealing steel plate; the ultrasonic probe comprises a plurality of ultrasonic probe groups arranged axially at intervals along the sealing steel plate, each ultrasonic probe group comprises a plurality of ultrasonic probe units arranged circumferentially at intervals along the sealing steel plate, and the processor is electrically connected to each ultrasonic probe unit; the ultrasonic probe unit is configured to receive and send signals.

[0007] In some embodiments, in each of the ultrasonic probe groups, the ultrasonic probe units are evenly arranged.

[0008] In some embodiments, the intervals between two adjacent ultrasonic probe groups are the same, and the positions of the ultrasonic probe units in the two adjacent ultrasonic probe groups correspond one to one.

[0009] In another aspect, a method for monitoring corrosion of a sealing steel plate of an underground gas storage reservoir is provided, which is applied to the above-mentioned device for monitoring corrosion of a sealing steel plate of an underground gas storage reservoir; the method comprises:

[0010] S1. Each ultrasonic probe unit receives an ultrasonic signal sent from an adjacent ultrasonic probe unit to obtain a plurality of monitoring sound pressures;

[0011] S2. If all monitored sound pressures are equal to the standard sound pressure, it is judged that the sealing steel plate is not corroded;

[0012] If a monitoring sound pressure lower than the standard sound pressure is detected, it is determined that the sealing steel plate is corroded; wherein the standard sound pressure is the monitoring sound pressure obtained by each ultrasonic probe unit when the sealing steel plate is not corroded.

[0013] In some embodiments, when a monitoring sound pressure less than a standard sound pressure is detected, the corrosion location is determined to be near the ultrasonic probe unit that receives the monitoring sound pressure.

[0014] In some embodiments, step S1 includes: using the ultrasonic signal sent by the first ultrasonic probe unit and received by the second ultrasonic probe unit as monitoring sound pressure; wherein the first ultrasonic probe unit and the second ultrasonic probe unit are ultrasonic probe units in two adjacent ultrasonic probe groups, respectively, and the positions of the first ultrasonic probe unit and the second ultrasonic probe unit correspond to each other.

[0015] In some embodiments, when the sealing steel plate is corroded, the diameter d2 of the corrosion point is calculated by the following formula:

[0016]

[0017] Where c4 is the material scattering coefficient, F is the anisotropy coefficient, L is the distance between two adjacent ultrasonic probe groups, and p1 is x is the standard sound pressure, p2 x To monitor the sound pressure, α is the refraction angle and x is the distance from the detection point to the wave source.

[0018] In some embodiments, step S1 includes: using the ultrasonic signal sent by the first ultrasonic probe unit and received by the second ultrasonic probe unit as monitoring sound pressure; wherein the first ultrasonic probe unit and the second ultrasonic probe unit are two adjacent ultrasonic probe units in the same ultrasonic probe group.

[0019] In some embodiments, when the sealing steel plate is corroded, the diameter d2 of the corrosion point is calculated by the following formula:

[0020]

[0021] Where c4 is the material scattering coefficient, F is the anisotropy coefficient, γ is the angle between two adjacent ultrasonic probe units in the same ultrasonic probe group, D is the diameter of the sealing steel plate, and p1 is x is the standard sound pressure, p2 x To monitor the sound pressure, α is the refraction angle and x is the distance from the detection point to the wave source.

[0022] On the other hand, a computer device is provided, comprising a memory, a processor and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of the above method.

[0023] The present application has at least the following technical effects or advantages: the present application can realize real-time and long-term monitoring of the corrosion of the sealing steel plates of underground gas storage facilities, and can determine the core corrosion area and degree of corrosion of the sealing steel plates, so as to carry out targeted repair and maintenance of the corrosion areas of the sealing steel plates of the gas storage caverns, thereby ensuring the safety and stability of the gas storage caverns during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic cross-sectional view of a corrosion monitoring device for a sealing steel plate of an underground gas storage reservoir in one embodiment of the present application;

[0025] Figure 2 It is a longitudinal cross-sectional schematic diagram of a corrosion monitoring device for a sealing steel plate of an underground gas storage reservoir in one embodiment of the present application;

[0026] Figure 3 Schematic diagram of the propagation path of the signal emitted by the ultrasonic probe in one embodiment of the present application. DETAILED DESCRIPTION

[0027] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0028] Embodiment 1

[0029] See also Figure 1-Figure 3 , a device for monitoring corrosion of a sealing steel plate of an underground gas storage reservoir, comprising an ultrasonic probe and a processor 3. The underground gas storage reservoir comprises a tubular sealing steel plate 1, and the ultrasonic probe is mounted on the inner wall of the sealing steel plate. The ultrasonic probe comprises a plurality of ultrasonic probe groups uniformly arranged along the axial direction of the sealing steel plate, each ultrasonic probe group comprises a plurality of ultrasonic probe units 2 uniformly arranged along the circumferential direction of the sealing steel plate, and the processor is electrically connected to each ultrasonic probe unit 2. The ultrasonic probe unit 2 is configured to receive and send signals.

[0030] This embodiment shows three ultrasonic probe groups, namely Ai, Bi and Ci. In actual application, the number of ultrasonic probe groups can be greater than or equal to 2.

[0031] A monitoring area is set inside the sealing steel plate 1, and an ultrasonic probe is arranged inside the sealing steel plate 1. The received ultrasonic signal is transmitted to the processor via optical fiber, and the processor performs further data processing to form an underground gas storage sealing steel plate corrosion monitoring device.

[0032] The cross-sectional diagram of the underground gas storage sealing steel plate corrosion monitoring device is shown in Figure 1 The longitudinal section diagram is shown in Figure 2 As shown. The application environment of the monitoring device is the underground gas storage of the circular cross-section tunnel type compressed air energy storage power station. The cross-section diameter of the cavern of this type of underground gas storage is large, and the diameter D is generally 5m to 14m. The traditional sealing steel plate + concrete sealing method is adopted, and the outer side is in direct contact with the surrounding rock. The sealing steel plate is generally ordinary carbon steel or high-strength steel. The sealing steel plate adopts thin steel plate, and the minimum thickness is generally 12mm to 30mm. The inner and outer sides are covered with anti-corrosion coatings, and the coating thickness is generally 400μm to 1000μm. The ultrasonic probe is arranged in a ring shape on the inner side of the sealing steel plate, with a ring angle of γ, and is arranged in multiple rings. The longitudinal spacing is L. The angle and spacing are related to the intensity of the received sound wave, the incident angle, the characteristics of the material to be tested, etc., and should be determined by the ultrasonic receiving and transmitting test in the field test. The probe is pasted or adsorbed on the inner surface of the sealing steel plate, which should have a certain ability to withstand high pressure and high temperature. The ultrasonic probe also has the function of waveguide emission and reception.

[0033] Embodiment 2

[0034] A method for monitoring corrosion of a sealing steel plate of an underground gas storage reservoir is applied to the above-mentioned monitoring device for monitoring corrosion of a sealing steel plate of an underground gas storage reservoir; the method comprises:

[0035] S1. Each ultrasonic probe unit receives an ultrasonic signal sent from an adjacent ultrasonic probe unit to obtain a plurality of monitoring sound pressures.

[0036] S2. If all monitored sound pressures are equal to the standard sound pressure, it is judged that the sealing steel plate is not corroded;

[0037] If a monitoring sound pressure lower than the standard sound pressure is detected, it is judged that the sealing steel plate is corroded; wherein the standard sound pressure is the monitoring sound pressure obtained by each ultrasonic probe unit when the sealing steel plate is not corroded. Specifically, the sealing steel plate of the underground gas storage is not corroded at the initial stage of operation, and the monitoring sound pressure at this time is obtained as the standard sound pressure. After a period of operation, if the sealing steel plate is corroded, the obtained monitoring sound pressure will be lower than the standard sound pressure, at which time it can be judged that the sealing steel plate is corroded.

[0038] Further, when a monitoring sound pressure lower than a standard sound pressure is detected, the corrosion position is determined to be near the ultrasonic probe unit that receives the monitoring sound pressure.

[0039] Specifically, one of the monitoring methods is:

[0040] The ultrasonic signal sent by the first ultrasonic probe unit and received by the second ultrasonic probe unit is used as the monitoring sound pressure; wherein the first ultrasonic probe unit and the second ultrasonic probe unit are ultrasonic probe units in two adjacent ultrasonic probe groups, and the positions of the first ultrasonic probe unit and the second ultrasonic probe unit correspond to each other.

[0041] If corrosion is detected on the sealing steel plate, the diameter d2 of the corrosion point can be calculated by the following formula:

[0042]

[0043] Where c4 is the material scattering coefficient, F is the anisotropy coefficient, L is the distance between two adjacent ultrasonic probe groups, and p1 is x is the standard sound pressure, p2 x To monitor the sound pressure, α is the refraction angle and x is the distance from the detection point to the wave source.

[0044] Another way to monitor is:

[0045] The ultrasonic signal sent by the first ultrasonic probe unit and received by the second ultrasonic probe unit is used as the monitoring sound pressure; wherein the first ultrasonic probe unit and the second ultrasonic probe unit are two adjacent ultrasonic probe units in the same ultrasonic probe group.

[0046] If corrosion is detected on the sealing steel plate, the diameter d2 of the corrosion point can be calculated by the following formula:

[0047]

[0048] Where c4 is the material scattering coefficient, F is the anisotropy coefficient, γ is the angle between two adjacent ultrasonic probe units in the same ultrasonic probe group, D is the diameter of the sealing steel plate, and p1 is x is the standard sound pressure, p2 x To monitor the sound pressure, α is the refraction angle, and x is the distance from the detection point to the wave source. The above parameters are all known parameters.

[0049] Taking a domestic compressed air energy storage underground high-pressure gas storage as an example, the gas storage cavern sealing steel plate is made of Q345R steel. Ultrasonic probes arranged in a circular and radial direction are pasted on the corrosion monitoring part of the gas storage cavern sealing steel plate. Each ultrasonic probe has the function of sending and receiving signals. Each adjacent two ultrasonic probes (can be ultrasonic probe units corresponding to two positions in two adjacent ultrasonic probe groups, or two adjacent ultrasonic probe units in the same ultrasonic probe group) can form a pair of monitoring groups. Each group can operate independently. By setting the ultrasonic transmission and reception frequency, each monitoring group can realize cyclic monitoring. The sound wave intensity received by the ultrasonic probe is transmitted to the processor as raw data, and the data is stored in the database. The location and diameter of the corrosion point are confirmed after data analysis.

[0050] Among them, since the thickness of the sealing steel plate is generally small, the ultrasonic probe uses an oblique probe, the refraction angle is 63°, the K value is a minimum of 2.0, and the ultrasonic wave used meets the requirements of high frequency and short wavelength. The ultrasonic probe spacing L is 50cm, the circumferential angle is 10°, and the ultrasonic probe transmits the ultrasonic wave in the direction from the small probe number to the large probe number. At this time, only the adjacent large-number ultrasonic probe receives the ultrasonic information, using a pulse wave. The transmission time of a single probe is 15 minutes, and then it is circulated to the next monitoring group. Wireless data transmission is used between the ultrasonic probe and the processor, and then the data is transmitted to the server through a dedicated cable or optical fiber in the corridor or shaft. When the diameter of the corrosion point d2 ≥ 1mm, a steel plate corrosion warning is issued, and a warning is given on the warning platform. It is necessary to suspend the filling and deflation work of the gas storage cavern, and manually check the corrosion position of the sealing steel plate of the gas storage cavern after deflation.

[0051] The principle of the above monitoring method is as follows:

[0052] Ultrasonic waves can be divided into plane waves and non-plane waves according to the wavefront. The vibration direction parallel to the propagation direction of the ultrasonic plane wave is called longitudinal wave, and the orthogonal one is called transverse wave. The use of ultrasonic waves for steel plate corrosion monitoring mainly utilizes the plane wave characteristics of its propagation in the material. Since there is acoustic impedance when ultrasonic waves propagate in solid materials, and reflection and refraction will occur when encountering interfaces in the material, firstly, ultrasonic waves of fixed frequency are emitted at the sound wave emission point, and the sound wave energy curve after refraction, reflection and loss in the initial state of the steel plate without corrosion is collected at the sound wave receiving point. After multiple test calibrations, this is used as the standard state energy curve for judging the steel plate without corrosion; during the corrosion monitoring process, the energy curve obtained at the actual sound wave receiving point is collected as the original data.

[0053] When ultrasonic waves propagate in solid media, they will experience energy loss, which is called attenuation. This is mainly manifested in the reduction of the amplitude. There are three ways for ultrasonic waves to attenuate: diffusion attenuation, medium absorption attenuation, and scattering attenuation.

[0054] Diffusion attenuation

[0055] During the propagation of ultrasound, due to the diffusion of the sound beam, the amplitude energy of the ultrasound will become smaller and smaller as the propagation distance increases. This phenomenon is called diffusion attenuation. Diffusion attenuation is due to the distance that the ultrasound propagates in the medium and has nothing to do with the propagation medium. The sound wave weakens as the propagation distance increases.

[0056] Dielectric absorption attenuation

[0057] Attenuation caused by absorption: particles vibrate under the action of ultrasound. There is a restraining force between particles, which hinders the vibration of particles and causes the loss of sound energy. The lost sound energy is converted into heat energy. During the propagation of ultrasound, the sound energy is converted into heat energy due to the absorption of the medium. The phenomenon that the heat energy gradually increases while the sound energy decreases is called absorption attenuation.

[0058] Scattering attenuation

[0059] The main factor causing the scattering attenuation of sound waves is the non-uniformity of a large number of crystalline metals in solids. Under the action of the grain boundaries of polycrystalline materials, ultrasonic waves will be reflected, refracted and converted into waveforms. The scattering attenuation increases with the increase of ultrasonic frequency, and the attenuation caused by transverse waves is greater than that of longitudinal waves.

[0060] Attenuation equation and attenuation coefficient

[0061] There is no diffusion attenuation for plane waves, only medium attenuation (absorption attenuation and scattering attenuation). The sound pressure attenuation equation is:

[0062] p x =p0e -ax ;

[0063] Where: p0 is the initial sound pressure of the wave source, p x is the sound pressure at a distance x from the wave source; x is the distance from the detection point to the wave source; a is the medium attenuation coefficient, and e is the base of the natural logarithm. The larger the ultrasonic attenuation coefficient, the more serious the ultrasonic energy attenuation. Under the same propagation medium, the higher the ultrasonic frequency, the greater the energy loss.

[0064] During the propagation of ultrasonic longitudinal waves, there is internal friction among the particles in the medium, and the kinetic energy and potential energy are converted into heat energy, resulting in the loss of ultrasonic longitudinal wave energy.

[0065] The medium attenuation coefficient a is:

[0066] a=a a +a s ;

[0067] In the formula, a a is the absorption attenuation coefficient, a s is the scattering attenuation coefficient.

[0068] The expression of absorption attenuation coefficient is:

[0069] a a =c1f;

[0070] The expression of scattering attenuation coefficient is:

[0071]

[0072] In the formula, f is the ultrasonic frequency; d is the grain diameter of the medium; λ is the wavelength; F is the anisotropy coefficient; c1 is the material absorption coefficient; c2, c3, c4 are the material scattering coefficients. c1, c2, c3, c4 are all constants.

[0073] λ = c / f;

[0074] Where c is the wave speed.

[0075] The ultrasonic outgoing sound beam is incident on the steel plate at an angle. When the intact steel plate is not corroded, the sound beam is reflected multiple times in the workpiece and propagates along the "w" path, such as Figure 3 At this time, the ultrasonic receiving probe receives only the initial wave after absorption attenuation and scattering attenuation, and the sound pressure at the receiving point is p1 x When there is corrosion in the steel plate, the reflected wave generated by the sound beam at the corrosion point will be received by the receiving probe behind, including the initial wave and the defect wave after absorption attenuation and scattering attenuation. The sound pressure at the receiving point is p2 x For steel plate corrosion, the corrosion point can be understood as a special grain boundary. It can be seen that when the ultrasonic wave velocity is constant, the larger the grain diameter, the stronger the scattering attenuation, the larger the scattering attenuation coefficient, and p2 x The smaller the corrosion degree, when it reaches d≥λ, the receiving position p2x Combined with the scattering attenuation law, the corrosion point diameter d2 is inferred. When d2 is greater than a certain threshold, a steel plate corrosion warning is issued.

[0076] Since the grain diameter d0 of the container steel plate is generally 0.01mm~0.03mm, when the ultrasonic wavelength λ is greater than d0, a s The value is very small. In this algorithm, for non-corroded steel plates, the attenuation coefficient only considers the absorption attenuation a a At this time, the sound pressure at a distance x from the wave source after attenuation is p1 x The non-corroded steel plate is a container steel plate that has passed rust removal and flaw detection and is considered to be in the initial state; for the corroded steel plate, the corroded steel plate is considered to have a corrosion degree that reaches the minimum corrosion accuracy that can be monitored by this patent (corrosion point diameter d2 ≥ λ). The attenuation coefficient of the steel plate to be tested takes into account both the absorption attenuation of the steel plate and the scattering attenuation of the corrosion. At this time, the sound pressure at a distance x from the wave source after attenuation is p2 x When the corrosion level does not reach the minimum corrosion accuracy that can be monitored by this patent, p2 x =p1 x At this time, the steel plate to be tested is considered to be free of corrosion. x2 <p1 x When the corrosion point diameter d2 is determined, the following formula is used.

[0077]

[0078] a1=a a ;

[0079] a a =c1f;

[0080] a2=a a +a s ;

[0081] a s =c4F / d2;

[0082] For radial ultrasonic probe installation, that is, A i With B i between:

[0083] x = L / sinα;

[0084] For the installation of circumferential ultrasonic probe, that is, A i With A i+1 between:

[0085] x = γD / πsinα;

[0086] It can be concluded that:

[0087]

[0088] The calculation can be obtained:

[0089]

[0090] For the diameter d2 of the corrosion point between radial ultrasonic probes, that is, A i With B i between:

[0091]

[0092] For the diameter d2 of the corrosion point between the annular ultrasonic probes, that is, A i With A i+1 between:

[0093]

[0094] According to the duration of the ultrasonic sound source, it can be divided into pulse wave and continuous wave. The duration of the continuous wave is longer than that of the pulse wave. Considering the purpose of corrosion monitoring and the slowness of corrosion damage, there is no sudden damage to the overall structure of the sealing steel plate when the corrosion state just appears. Therefore, the use of pulse wave as the sound wave source has a negligible impact on the real-time monitoring. At the same time, since each ultrasonic sensor has both receiving and transmitting functions, and multiple ultrasonic sensors are arranged on the sealing steel plate, in order to avoid interference between the receiving and transmitting energy between sensors during operation, pulse waves are used and the frequency characteristics of the transmitted ultrasonic wave are controlled.

[0095] When a corrosion warning occurs, the visual interface will display the warning probe screen, where green represents the normal probe block and red represents the alarm probe block. For the alarm block, it is necessary to suspend the filling and deflation work of the gas storage chamber and conduct a manual inspection of the warning position after deflation.

[0096] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0097] Similarly, it should be understood that in order to streamline the present disclosure and aid in understanding one or more of the various inventive aspects, in the above description of exemplary embodiments of the present invention, various features of the present invention are sometimes grouped together into a single embodiment, figure, or description thereof. However, this disclosed method should not be interpreted as reflecting the intention that the claimed invention requires more features than those expressly recited in each claim. Rather, as reflected in the claims, inventive aspects lie in less than all of the features of the individual embodiments previously disclosed. Therefore, the claims that follow the detailed description are hereby expressly incorporated into the detailed description, with each claim itself serving as a separate embodiment of the present invention.

[0098] Those skilled in the art will appreciate that the modules or units or groups of the devices in the examples disclosed herein may be arranged in the device as described in the embodiment, or alternatively may be located in one or more devices different from the devices in the example. The modules in the foregoing examples may be combined into one module or may be divided into multiple submodules.

[0099] Those skilled in the art will appreciate that the modules in the devices in the embodiments may be adaptively changed and arranged in one or more devices different from the embodiments. The modules or units or groups in the embodiments may be combined into one module or unit or group, and in addition they may be divided into a plurality of submodules or subunits or subgroups. Except that at least some of such features and / or processes or units are mutually exclusive, all features disclosed in this specification (including the accompanying claims, abstracts and drawings) and all processes or units of any method or device disclosed in this manner may be combined in any combination. Unless otherwise expressly stated, each feature disclosed in this specification (including the accompanying claims, abstracts and drawings) may be replaced by an alternative feature providing the same, equivalent or similar purpose.

[0100] Furthermore, those skilled in the art will appreciate that although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features from different embodiments is meant to be within the scope of the present invention and to form different embodiments.

[0101] In addition, some of the embodiments are described herein as methods or combinations of method elements that can be implemented by a processor of a computer system or by other devices that perform the functions. Therefore, a processor with necessary instructions for implementing the method or method elements forms a device for implementing the method or method elements. In addition, the elements described herein of the device embodiments are examples of devices for implementing the functions performed by the elements for the purpose of implementing the invention.

[0102] The various techniques described herein may be implemented in combination with hardware or software, or a combination thereof. Thus, the method and apparatus of the present invention, or some aspects or portions of the method and apparatus of the present invention may be in the form of program codes (i.e., instructions) embedded in a tangible medium, such as a floppy disk, a CD-ROM, a hard disk drive, or any other machine-readable storage medium, wherein when the program is loaded into a machine such as a computer and executed by the machine, the machine becomes a device for practicing the present invention.

[0103] In the case where the program code is executed on a programmable computer, the computing device generally includes a processor, a storage medium readable by the processor (including volatile and non-volatile memory and / or storage elements), at least one input device, and at least one output device. The memory is configured to store the program code; the processor is configured to execute the method of the present invention according to the instructions in the program code stored in the memory.

[0104] By way of example and not limitation, computer readable media include computer storage media and communication media. Computer readable media include computer storage media and communication media. Computer storage media stores information such as computer readable instructions, data structures, program modules or other data. Communication media generally embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transmission mechanism, and includes any information delivery medium. Any combination of the above is also included within the scope of computer readable media.

[0105] As used herein, unless otherwise specified, the use of ordinal numbers "first," "second," "third," etc. to describe common objects merely indicates that different instances of similar objects are involved, and is not intended to imply that the objects so described must have a given order in time, space, order, or in any other manner.

[0106] Although the present invention has been described according to a limited number of embodiments, it will be apparent to those skilled in the art, with the benefit of the above description, that other embodiments may be envisioned within the scope of the invention thus described. In addition, it should be noted that the language used in this specification is selected primarily for readability and teaching purposes, rather than for explaining or defining the subject matter of the present invention. Therefore, many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the appended claims. The disclosure of the present invention is illustrative, not restrictive, with respect to the scope of the present invention, which is defined by the appended claims.

[0107] Finally, it should be noted that the present invention does not explain in detail the common knowledge recognized by technicians in this field. The above is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A corrosion monitoring device for sealing steel plates of underground gas storage, characterized in that: It comprises an ultrasonic probe and a processor; the underground gas storage comprises a tubular sealing steel plate, the ultrasonic probe is mounted on the inner side wall of the sealing steel plate; the ultrasonic probe comprises a plurality of ultrasonic probe groups arranged at intervals along the axial direction of the sealing steel plate, each ultrasonic probe group comprises a plurality of ultrasonic probe units arranged at intervals along the circumferential direction of the sealing steel plate, and the processor is electrically connected to each ultrasonic probe unit; The ultrasound probe unit is configured to receive and transmit signals.

2. The underground gas storage sealing steel plate corrosion monitoring device according to claim 1 is characterized in that: In each of the ultrasonic probe groups, the ultrasonic probe units are evenly arranged.

3. The underground gas storage sealing steel plate corrosion monitoring device according to claim 1 or 2, characterized in that: The intervals between two adjacent ultrasonic probe groups are the same, and the positions of the ultrasonic probe units in the two adjacent ultrasonic probe groups correspond one to one.

4. A method for monitoring corrosion of a sealing steel plate of an underground gas storage reservoir, applied to the device for monitoring corrosion of a sealing steel plate of an underground gas storage reservoir as claimed in any one of claims 1 to 3; characterized in that: The method includes: S1. Each ultrasonic probe unit receives an ultrasonic signal sent from an adjacent ultrasonic probe unit to obtain a plurality of monitoring sound pressures; S2. If all monitored sound pressures are equal to the standard sound pressure, it is judged that the sealing steel plate is not corroded; If a monitoring sound pressure lower than the standard sound pressure is detected, it is determined that the sealing steel plate is corroded; wherein the standard sound pressure is the monitoring sound pressure obtained by each ultrasonic probe unit when the sealing steel plate is not corroded.

5. The underground gas storage sealing steel plate corrosion monitoring method according to claim 4 is characterized in that: When a monitoring sound pressure lower than the standard sound pressure is detected, the corrosion position is determined to be near the ultrasonic probe unit that receives the monitoring sound pressure.

6. The underground gas storage sealing steel plate corrosion monitoring method according to claim 4 or 5, characterized in that: Step S1 includes: using the ultrasonic signal sent by the first ultrasonic probe unit and received by the second ultrasonic probe unit as monitoring sound pressure; wherein the first ultrasonic probe unit and the second ultrasonic probe unit are ultrasonic probe units in two adjacent ultrasonic probe groups, and the positions of the first ultrasonic probe unit and the second ultrasonic probe unit correspond to each other.

7. The underground gas storage sealing steel plate corrosion monitoring method according to claim 6 is characterized in that: When the sealing steel plate is corroded, the diameter d2 of the corrosion point is calculated by the following formula: Where c4 is the material scattering coefficient, F is the anisotropy coefficient, L is the distance between two adjacent ultrasonic probe groups, and p1 is x is the standard sound pressure, p2 x To monitor the sound pressure, α is the refraction angle and x is the distance from the detection point to the wave source.

8. The underground gas storage sealing steel plate corrosion monitoring method according to claim 4 or 5, characterized in that: Step S1 includes: using the ultrasonic signal sent by the first ultrasonic probe unit and received by the second ultrasonic probe unit as monitoring sound pressure; wherein the first ultrasonic probe unit and the second ultrasonic probe unit are two adjacent ultrasonic probe units in the same ultrasonic probe group.

9. The underground gas storage sealing steel plate corrosion monitoring method according to claim 8, characterized in that: When the sealing steel plate is corroded, the diameter d2 of the corrosion point is calculated by the following formula: Where c4 is the material scattering coefficient, F is the anisotropy coefficient, γ is the angle between two adjacent ultrasonic probe units in the same ultrasonic probe group, D is the diameter of the sealing steel plate, and p1 is x is the standard sound pressure, p2 x To monitor the sound pressure, a is the refraction angle and x is the distance from the detection point to the wave source.

10. A computer device comprising a memory, a processor and a computer program stored in the memory, characterized in that: The processor executes the computer program to implement the steps of the method according to any one of claims 4 to 9.

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