On-line monitoring method and device for corrosion change condition of bottom plate of storage tank

Abstract

The invention provides an online monitoring method and device for the corrosion change condition of a storage tank bottom plate. The method comprises the steps that a to-be-monitored point of the storage tank bottom plate is determined, and an ultrasonic guided wave sensor probe used for monitoring the corrosion change condition of the to-be-monitored point and the distance between the to-be-monitored point and the ultrasonic guided wave sensor probe are determined; detection curves of the ultrasonic guided wave sensor probe are obtained regularly, and for two adjacent detection curves, difference processing is carried out on the latter detection curve and the former detection curve to obtain a change curve; wherein the abscissa of the detection curve represents the distance between a point in the ultrasonic guided wave transmission path and the ultrasonic guided wave sensor probe, and the ordinate of the detection curve represents the signal amplitude; and determining the corrosion change rate of the to-be-monitored point according to the value of the change curve when the value of the abscissa is the distance and the value of the corresponding previous detection curve. According to the online monitoring method and device for the corrosion change condition of the storage tank bottom plate, online monitoring of the corrosion change condition of the storage tank bottom plate is achieved.

Description

Technical Field

[0001] This invention relates to the field of detection technology, and in particular to an online monitoring method and device for corrosion changes in the bottom plate of a storage tank. Background Technology

[0002] The bottom plate is the weakest point of the storage tank. Impurities such as water in the stored medium easily accumulate at the bottom, making this area most susceptible to corrosion and perforation. Statistical analysis of numerous testing cases has revealed that the edge plates of the bottom plate, due to their connection to the tank wall and relatively complex structure and stress distribution, are more prone to corrosion than the inner bottom plate. Furthermore, because they provide support for the tank wall, corrosion in this area poses a significant safety hazard.

[0003] Opening the tank for inspection requires shutting down production and cleaning, which is time-consuming and expensive. It is usually done periodically, which can lead to over-inspection or untimely inspection. Bottom plate leakage monitoring technology involves installing leak sensors, such as oil-sensing cables, on the foundation side of the tank bottom plate. This can only be installed during tank construction and cannot be used after the tank is put into operation.

[0004] Corrosion changes are an important aspect of monitoring corrosion on the bottom plate of storage tanks. The ability to monitor corrosion changes on the bottom plate of storage tanks without opening the tank or interrupting production through online detection is of great significance for ensuring safe production. Summary of the Invention

[0005] This invention provides a method and apparatus for online monitoring of corrosion changes in the bottom plate of a storage tank, thereby overcoming the shortcomings of existing technologies that cannot achieve online monitoring of corrosion changes in the bottom plate of a storage tank, and realizing online monitoring of corrosion changes in the bottom plate of a storage tank.

[0006] This invention provides an online monitoring method for corrosion changes in the bottom plate of a storage tank, comprising: determining a monitoring point on the bottom plate of the storage tank, determining an ultrasonic guided wave sensor probe for monitoring corrosion changes at the monitoring point, and determining the distance between the monitoring point and the ultrasonic guided wave sensor probe; periodically acquiring the detection curve of the ultrasonic guided wave sensor probe, and for two adjacent detection curves, subtracting the latter detection curve from the former detection curve to obtain a change curve; wherein, the horizontal axis of the detection curve represents the distance between a point in the ultrasonic guided wave transmission path and the ultrasonic guided wave sensor probe, and the vertical axis of the detection curve represents the signal amplitude; determining the corrosion change rate of the monitoring point based on the value of the change curve when the horizontal axis value is the distance and the corresponding value of the former detection curve.

[0007] According to the present invention, an online monitoring method for corrosion changes of the bottom plate of a storage tank is provided, the method further includes: determining the magnitude of corrosion change at the monitoring point based on the value of the change curve when the horizontal coordinate is the specified spacing.

[0008] According to the present invention, an online monitoring method for corrosion changes in the bottom plate of a storage tank includes determining the monitoring point of the bottom plate of the storage tank by: acquiring a detection curve using ultrasonic guided wave sensor probes distributed on the outer edge plate of the bottom plate of the storage tank; determining the echo distance of the echo generated by the bottom plate corrosion based on the detection curve; for each ultrasonic guided wave sensor probe, drawing a circle with the location of the ultrasonic guided wave sensor probe as the center and the echo distance determined based on the detection curve of the ultrasonic guided wave sensor probe as the radius; obtaining the intersection point of the circles drawn based on each ultrasonic guided wave sensor probe inside the storage tank, and taking the intersection point as the monitoring point.

[0009] According to the present invention, an online monitoring method for corrosion changes in the bottom plate of a storage tank includes determining an ultrasonic guided wave sensor probe for monitoring corrosion changes at the monitoring point, comprising: obtaining the distance between the monitoring point and each of the ultrasonic guided wave sensor probes, and determining the ultrasonic guided wave sensor probe with the smallest distance value as the ultrasonic guided wave sensor probe for monitoring corrosion changes at the monitoring point.

[0010] According to the present invention, an online monitoring method for corrosion changes of a storage tank bottom plate is provided, wherein each of the ultrasonic guided wave sensor probes is pre-embedded at multiple preset positions on the outer edge plate of the storage tank bottom plate.

[0011] According to the present invention, an online monitoring method for corrosion changes of the bottom plate of a storage tank is provided, wherein before the difference between the subsequent detection curve and the previous detection curve is calculated, the method further includes: removing interference signals by noise reduction processing of the detection curve.

[0012] This invention also provides an online monitoring device for corrosion changes in the bottom plate of a storage tank, comprising the following modules: a determination module, used to: determine the monitoring point on the bottom plate of the storage tank, determine the ultrasonic guided wave sensor probe used to monitor the corrosion changes at the monitoring point, and the distance between the monitoring point and the ultrasonic guided wave sensor probe; an acquisition module, used to: periodically acquire the detection curve of the ultrasonic guided wave sensor probe, and for two adjacent detection curves, subtract the latter detection curve from the former detection curve to obtain a change curve; wherein, the horizontal axis of the detection curve represents the distance between a point in the ultrasonic guided wave transmission path and the ultrasonic guided wave sensor probe, and the vertical axis of the detection curve represents the signal amplitude; and an analysis module, used to: determine the corrosion change rate of the monitoring point based on the value of the change curve when the horizontal axis value is the distance and the corresponding value of the former detection curve.

[0013] The present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the online monitoring method for corrosion changes of the tank bottom plate as described above.

[0014] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the online monitoring method for corrosion changes of the tank bottom plate as described above.

[0015] The present invention also provides a computer program product, including a computer program, which, when executed by a processor, implements the online monitoring method for corrosion changes of the tank bottom plate as described above.

[0016] The present invention provides a method and apparatus for online monitoring of corrosion changes in tank bottom plates. This method determines the monitoring points on the tank bottom plate, the ultrasonic guided wave sensor probe used to monitor corrosion changes at these points, and the distance between the monitoring points and the ultrasonic guided wave sensor probe. It periodically acquires the detection curves of the ultrasonic guided wave sensor probe. For two adjacent detection curves, the difference between the latter and the former is calculated to obtain a change curve. The horizontal axis of the detection curve represents the distance between a point in the ultrasonic guided wave transmission path and the ultrasonic guided wave sensor probe, while the vertical axis represents the signal amplitude. The corrosion rate at the monitoring point is determined based on the value of the change curve when the horizontal axis value is the distance and the corresponding value of the former detection curve, thus achieving online monitoring of corrosion changes in the tank bottom plate. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a flowchart illustrating the online monitoring method for corrosion changes in the bottom plate of a storage tank provided by the present invention.

[0019] Figure 2 This is a schematic diagram of the detection curve before two adjacent scanning processes in the online monitoring method for corrosion changes of the tank bottom plate provided by the present invention.

[0020] Figure 3 This is a schematic diagram of the detection curve after two consecutive scanning processes of the online monitoring method for corrosion changes of the tank bottom plate provided by the present invention.

[0021] Figure 4This is a schematic diagram of the change curve in the online monitoring of corrosion changes in the tank bottom plate provided by the present invention.

[0022] Figure 5 This is a schematic diagram of the filtered change curve in the online monitoring of corrosion changes in the tank bottom plate provided by the present invention.

[0023] Figure 6 This is a schematic diagram of the arrangement of ultrasonic guided wave sensor probes in the online monitoring method for corrosion changes of the tank bottom plate provided by the present invention.

[0024] Figure 7 This is a schematic diagram of the structure of the online monitoring device for corrosion changes in the bottom plate of the storage tank provided by the present invention.

[0025] Figure 8 This is a schematic diagram of the structure of the electronic device provided by the present invention. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention 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 invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0027] Figure 1 This is a flowchart illustrating the online monitoring method for corrosion changes in the bottom plate of a storage tank provided by the present invention. Figure 1 As shown, the method includes: Step S1: Determine the monitoring point on the bottom plate of the storage tank, determine the ultrasonic guided wave sensor probe used to monitor the corrosion changes of the monitoring point, and the distance between the monitoring point and the ultrasonic guided wave sensor probe.

[0028] The monitoring points are points on the bottom plate of the storage tank used for corrosion monitoring. These can be pre-set points, such as points on the bottom plate where corrosion has occurred, identified through prior testing. There can be multiple monitoring points. For each monitoring point, the ultrasonic guided wave sensor probe used to monitor corrosion changes at that point, and the distance between the monitoring point and the ultrasonic guided wave sensor probe, are determined. One ultrasonic guided wave sensor probe can be used to monitor the monitoring point. Multiple ultrasonic guided wave sensor probes can be deployed to monitor corrosion changes at multiple monitoring points.

[0029] Step S2: Periodically acquire the detection curve of the ultrasonic guided wave sensor probe. For two adjacent detection curves, subtract the latter detection curve from the former detection curve to obtain the change curve. The horizontal axis of the detection curve represents the distance between a point in the ultrasonic guided wave transmission path and the ultrasonic guided wave sensor probe, and the vertical axis of the detection curve represents the signal amplitude.

[0030] Regularly obtain the detection curves of the ultrasonic guided wave sensor probe. If the ultrasonic guided wave encounters corrosion points during transmission, an echo will be generated, which can be identified in the detection curve. Echoes caused by weld seams will also be generated during ultrasonic guided wave transmission, but the echo generated at the monitoring point is caused by corrosion of the base plate.

[0031] Figure 2 This is a schematic diagram of the detection curve before two adjacent scanning processes in the online monitoring method for corrosion changes of the tank bottom plate provided by the present invention.

[0032] Figure 3 This is a schematic diagram of the detection curve after two consecutive scanning processes of the online monitoring method for corrosion changes of the tank bottom plate provided by the present invention.

[0033] like Figure 2 , Figure 3 As shown, the horizontal axis of the detection curve represents the distance between a point in the ultrasonic guided wave transmission path and the ultrasonic guided wave sensor probe, while the vertical axis represents the signal amplitude, which can be expressed as a voltage value. In the detection curve, the location where the echo is generated has a distinct amplitude, which can be used to determine the echo distance, i.e., the distance between the point where the echo is generated and the ultrasonic guided wave sensor probe.

[0034] Figure 4 This is a schematic diagram of the variation curve in the online monitoring of corrosion changes in the tank bottom plate provided by this invention. The horizontal axis of the variation curve represents the distance between a point in the ultrasonic guided wave transmission path and the ultrasonic guided wave sensor probe, and the vertical axis represents the difference in amplitude between the subsequent detection curve and the previous detection curve. The variation curve can be used to identify the echo distance corresponding to a large change in amplitude.

[0035] Figure 5 This is a schematic diagram of the filtered change curve in the online monitoring of corrosion changes in the tank bottom plate provided by the present invention. Figure 5 The curve shown is the change curve after filtering out the echo signal caused by the weld.

[0036] Step S3: Determine the corrosion rate of the monitoring point based on the value of the change curve when the horizontal coordinate is the specified spacing and the value of the corresponding previous detection curve.

[0037] In two adjacent detection processes, the ordinate value, where the x-axis represents the distance between the monitored point and the ultrasonic guided wave sensor probe, represents the signal amplitude of the echo during the two detection processes. The ordinate value of the variation curve, where the x-axis represents the distance between the monitored point and the ultrasonic guided wave sensor probe, represents the change in the signal amplitude of the echo during the two detection processes. By quotienting the change in the signal amplitude of the echo during the two detection processes (represented by the ordinate value of the variation curve where the x-axis represents the distance between the monitored point and the ultrasonic guided wave sensor probe) with the amplitude at the same position on the detection curve obtained from the previous detection, the corrosion rate of the monitored point during the two adjacent detection processes can be obtained.

[0038] As regular inspections continue, for two adjacent inspection processes, the corrosion rate of the monitored point is determined by the value of the curve showing the change in the distance between the monitored point and the ultrasonic guided wave sensor probe on the horizontal axis, and the value of the corresponding previous inspection curve. This allows us to obtain information about the changes in the corrosion rate.

[0039] Therefore, by continuously and regularly collecting data, the corrosion monitoring effect of the tank bottom plate can be achieved. Since corrosion does not occur instantaneously, there is no need for real-time monitoring. The method of regularly collecting data can achieve the monitoring effect while reducing the waste of resources and optimizing efficiency.

[0040] The present invention provides an online monitoring method for corrosion changes in the bottom plate of a storage tank. This method determines the monitoring point on the tank bottom plate, the ultrasonic guided wave sensor probe used to monitor corrosion changes at that point, and the distance between the monitoring point and the ultrasonic guided wave sensor probe. It periodically acquires the detection curve of the ultrasonic guided wave sensor probe. For two adjacent detection curves, the difference between the latter and the former is calculated to obtain a change curve. The horizontal axis of the detection curve represents the distance between a point in the ultrasonic guided wave transmission path and the ultrasonic guided wave sensor probe, and the vertical axis represents the signal amplitude. The corrosion rate at the monitoring point is determined based on the value of the change curve when the horizontal axis value is the distance and the corresponding value of the former detection curve, thus achieving online monitoring of corrosion changes in the tank bottom plate.

[0041] According to the present invention, an online monitoring method for corrosion changes of the bottom plate of a storage tank is provided, the method further includes: determining the magnitude of corrosion change at the monitoring point based on the value of the change curve when the horizontal coordinate is the specified spacing.

[0042] The value of the curve where the horizontal axis represents the distance between the monitored point and the ultrasonic guided wave sensor probe is related to the change in corrosion depth, i.e., it reflects the magnitude of corrosion change. Depending on the analytical requirements, the magnitude of corrosion change at the monitored point can be determined based on the value of the curve where the horizontal axis represents the distance.

[0043] The online monitoring method for corrosion changes of tank bottom plates provided by this invention determines the magnitude of corrosion changes at the monitoring point by using the value of the change curve when the horizontal axis is the interval, thereby improving the comprehensiveness of online monitoring of corrosion changes of tank bottom plates.

[0044] According to the present invention, an online monitoring method for corrosion changes in the bottom plate of a storage tank includes determining the monitoring point of the bottom plate of the storage tank by: acquiring a detection curve using ultrasonic guided wave sensor probes distributed on the outer edge plate of the bottom plate of the storage tank; determining the echo distance of the echo generated by the bottom plate corrosion based on the detection curve; for each ultrasonic guided wave sensor probe, drawing a circle with the location of the ultrasonic guided wave sensor probe as the center and the echo distance determined based on the detection curve of the ultrasonic guided wave sensor probe as the radius; obtaining the intersection point of the circles drawn based on each ultrasonic guided wave sensor probe inside the storage tank, and taking the intersection point as the monitoring point.

[0045] When determining the monitoring points on the bottom plate of the storage tank, the monitoring points are determined by the detection curves obtained by multiple ultrasonic guided wave sensor probes arranged in a distributed manner.

[0046] Multiple ultrasonic guided wave sensor probes are distributed on the outer edge plate of the tank bottom plate, and the detection curves of each probe are acquired. The echo distance of the echo generated by the bottom plate corrosion in the detection curve of each probe is identified, that is, the distance between the point of bottom plate corrosion and the ultrasonic guided wave sensor probe. In a single detection curve, there may be multiple echo distances generated by bottom plate corrosion, meaning that multiple corrosion points produce echo signals.

[0047] For each ultrasonic guided wave sensor probe, a circle is drawn with the probe's location as the center and the echo distance determined based on the probe's detection curve as the radius. If the probe's detection curve identifies n echo distances caused by substrate corrosion, then the circles drawn with the probe's location as the center and the echo distance determined based on the probe's detection curve as the radius are n concentric circles.

[0048] The circle drawn by a single ultrasonic guided wave sensor probe cannot pinpoint the corrosion point. This embodiment uses circles drawn by multiple ultrasonic guided wave sensor probes to locate the corrosion point. The corrosion point is the intersection of the circles drawn by the multiple ultrasonic guided wave sensor probes. Online monitoring of the corrosion point is required. Since the corrosion of the bottom plate is caused by the medium stored in the tank, the corrosion point usually occurs inside the tank. Therefore, the intersection of the circles drawn by each ultrasonic guided wave sensor probe located inside the tank is obtained and used as the monitoring point.

[0049] The online monitoring method for corrosion changes in the bottom plate of a storage tank provided by this invention utilizes ultrasonic guided wave sensor probes distributed on the outer edge plate of the storage tank bottom plate to obtain detection curves. Based on the detection curves, the echo distance of the echo generated by the bottom plate corrosion is determined. For each ultrasonic guided wave sensor probe, a circle is drawn with the location of the ultrasonic guided wave sensor probe as the center and the echo distance determined based on the detection curve of the ultrasonic guided wave sensor probe as the radius. The intersection point of the circles drawn based on each ultrasonic guided wave sensor probe is obtained inside the storage tank, and the intersection point is used as the monitoring point, thus achieving accurate determination of the monitoring point.

[0050] According to the present invention, an online monitoring method for corrosion changes in the bottom plate of a storage tank includes determining an ultrasonic guided wave sensor probe for monitoring corrosion changes at the monitoring point, comprising: obtaining the distance between the monitoring point and each of the ultrasonic guided wave sensor probes, and determining the ultrasonic guided wave sensor probe with the smallest distance value as the ultrasonic guided wave sensor probe for monitoring corrosion changes at the monitoring point.

[0051] The closer the ultrasonic guided wave sensor probe is to the point to be monitored, the higher the signal strength and the less interference it receives. Therefore, when determining the ultrasonic guided wave sensor probe used to monitor corrosion changes at the point to be monitored, the distance between the point to be monitored and each ultrasonic guided wave sensor probe is obtained, and the ultrasonic guided wave sensor probe with the smallest distance value is selected as the ultrasonic guided wave sensor probe used to monitor corrosion changes at the point to be monitored.

[0052] The online monitoring method for corrosion changes in the bottom plate of a storage tank provided by this invention improves the accuracy of determining the ultrasonic guided wave sensor probe used to monitor corrosion changes at the monitoring point by obtaining the distance between the monitoring point and each ultrasonic guided wave sensor probe, and determining the ultrasonic guided wave sensor probe with the smallest distance value. This improves the accuracy of the online monitoring results for corrosion changes in the bottom plate of the storage tank.

[0053] According to the present invention, an online monitoring method for corrosion changes of a storage tank bottom plate is provided, wherein each of the ultrasonic guided wave sensor probes is pre-embedded at multiple preset positions on the outer edge plate of the storage tank bottom plate.

[0054] Figure 6 This is a schematic diagram showing the arrangement of the ultrasonic guided wave sensor probe in the online monitoring method for corrosion changes in the tank bottom plate provided by this invention. Figure 6As shown, each ultrasonic guided wave sensor probe is pre-embedded in multiple preset positions on the outer edge plate of the tank bottom plate. These preset positions can be defined as each individual outer edge plate or selected key monitoring areas. The ultrasonic guided wave sensor probes are pre-embedded in multiple preset positions on the outer edge plate of the tank bottom plate, with the probes close to the upper surface of the outer edge plate and covered with a waterproof and anti-corrosion coating. The connection ports between the probes and the machine are exposed.

[0055] The online monitoring method for corrosion changes in the tank bottom plate provided by this invention facilitates the execution of online monitoring by pre-embedding various ultrasonic guided wave sensor probes at multiple preset positions on the outer edge plate of the tank bottom plate.

[0056] According to the present invention, an online monitoring method for corrosion changes of the bottom plate of a storage tank is provided, wherein before the difference between the subsequent detection curve and the previous detection curve is calculated, the method further includes: removing interference signals by noise reduction processing of the detection curve.

[0057] The detection signal may also contain noise, which can affect subsequent analysis and processing. Therefore, before subtracting the previous detection curve from the subsequent one, noise reduction processing is performed to remove interference signals. This noise reduction can be performed before or after filtering.

[0058] The online monitoring method for corrosion changes in tank bottom plates provided by this invention further improves the accuracy of online monitoring of corrosion changes in tank bottom plates by removing interference signals through noise reduction processing of the detection curve.

[0059] The online monitoring device for corrosion changes of the tank bottom plate provided by the present invention is described below. The online monitoring device for corrosion changes of the tank bottom plate described below and the online monitoring method for corrosion changes of the tank bottom plate described above can be referred to in correspondence with each other.

[0060] Figure 7 This is a schematic diagram of the online monitoring device for corrosion changes in the bottom plate of a storage tank provided by the present invention. Figure 7As shown, the device includes a determining module 10, an acquiring module 20, and an analyzing module 30. The determining module 10 is used to: determine the monitoring point on the bottom plate of the storage tank, determine the ultrasonic guided wave sensor probe used to monitor the corrosion changes at the monitoring point, and determine the distance between the monitoring point and the ultrasonic guided wave sensor probe. The acquiring module 20 is used to: periodically acquire the detection curve of the ultrasonic guided wave sensor probe; for two adjacent detection curves, the difference between the latter and the former detection curve is calculated to obtain a change curve; wherein the horizontal axis of the detection curve represents the distance between a point in the ultrasonic guided wave transmission path and the ultrasonic guided wave sensor probe, and the vertical axis of the detection curve represents the signal amplitude. The analyzing module 30 is used to: determine the corrosion change rate of the monitoring point based on the value of the change curve when the horizontal axis value is the specified distance and the corresponding value of the former detection curve.

[0061] The present invention provides an online monitoring method for corrosion changes in the bottom plate of a storage tank. This method determines the monitoring point on the tank bottom plate, the ultrasonic guided wave sensor probe used to monitor corrosion changes at that point, and the distance between the monitoring point and the ultrasonic guided wave sensor probe. It periodically acquires the detection curve of the ultrasonic guided wave sensor probe. For two adjacent detection curves, the difference between the latter and the former is calculated to obtain a change curve. The horizontal axis of the detection curve represents the distance between a point in the ultrasonic guided wave transmission path and the ultrasonic guided wave sensor probe, and the vertical axis represents the signal amplitude. The corrosion rate at the monitoring point is determined based on the value of the change curve when the horizontal axis value is the distance and the corresponding value of the former detection curve, thus achieving online monitoring of corrosion changes in the tank bottom plate.

[0062] Figure 8 An example is a schematic diagram of the physical structure of an electronic device, such as... Figure 8As shown, the electronic device may include: a processor 710, a communication interface 720, a memory 730, and a communication bus 740, wherein the processor 710, the communication interface 720, and the memory 730 communicate with each other through the communication bus 740. The processor 710 can call logic instructions in the memory 730 to execute an online monitoring method for corrosion changes in the tank bottom plate. This method includes: determining a monitoring point on the tank bottom plate; determining an ultrasonic guided wave sensor probe for monitoring corrosion changes at the monitoring point; and determining the distance between the monitoring point and the ultrasonic guided wave sensor probe. The method also includes periodically acquiring detection curves from the ultrasonic guided wave sensor probe; for two adjacent detection curves, subtracting the latter from the former to obtain a change curve; wherein the horizontal axis of the detection curve represents the distance between a point in the ultrasonic guided wave transmission path and the ultrasonic guided wave sensor probe, and the vertical axis represents the signal amplitude; and determining the corrosion change rate of the monitoring point based on the value of the change curve when the horizontal axis value is the specified distance and the corresponding value of the former detection curve.

[0063] Furthermore, the logical instructions in the aforementioned memory 730 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, essentially, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0064] On the other hand, the present invention also provides a computer program product, which includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the online monitoring method for corrosion changes of the tank bottom plate provided by the above methods. The method includes: determining a monitoring point on the tank bottom plate, determining an ultrasonic guided wave sensor probe for monitoring corrosion changes at the monitoring point, and the distance between the monitoring point and the ultrasonic guided wave sensor probe; periodically acquiring the detection curve of the ultrasonic guided wave sensor probe, and for two adjacent detection curves, subtracting the latter detection curve from the former detection curve to obtain a change curve; wherein, the horizontal axis of the detection curve represents the distance between a point in the ultrasonic guided wave transmission path and the ultrasonic guided wave sensor probe, and the vertical axis of the detection curve represents the signal amplitude; and determining the corrosion change rate of the monitoring point based on the value of the change curve when the horizontal axis value is the distance and the corresponding value of the former detection curve.

[0065] In another aspect, the present invention also provides a non-transitory computer-readable storage medium storing a computer program thereon. When executed by a processor, the computer program implements an online monitoring method for corrosion changes in the bottom plate of a storage tank provided by the methods described above. This method includes: determining a monitoring point on the bottom plate of the storage tank; determining an ultrasonic guided wave sensor probe for monitoring corrosion changes at the monitoring point; and determining the distance between the monitoring point and the ultrasonic guided wave sensor probe. The method periodically acquires the detection curve of the ultrasonic guided wave sensor probe; for two adjacent detection curves, the difference between the latter and the former detection curve is calculated to obtain a change curve. The horizontal axis of the detection curve represents the distance between a point in the ultrasonic guided wave transmission path and the ultrasonic guided wave sensor probe, and the vertical axis of the detection curve represents the signal amplitude. The corrosion change rate of the monitoring point is determined based on the value of the change curve when the horizontal axis value is the distance and the corresponding value of the former detection curve.

[0066] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0067] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for online monitoring of corrosion changes in the bottom plate of a storage tank, characterized in that, include: The monitoring point on the bottom plate of the storage tank is determined, as are the ultrasonic guided wave sensor probes used to monitor the corrosion changes at the monitoring points and the distance between the monitoring points and the ultrasonic guided wave sensor probes. The detection curves of the ultrasonic guided wave sensor probe are periodically acquired. For two adjacent detection curves, the difference between the latter and the former is calculated to obtain a change curve. The horizontal axis of the detection curve represents the distance between a point in the ultrasonic guided wave transmission path and the ultrasonic guided wave sensor probe, and the vertical axis represents the signal amplitude. The corrosion rate of the monitored point is determined based on the value of the change curve when the horizontal axis value is the specified distance and the corresponding value of the former detection curve.

2. The online monitoring method for corrosion changes of the tank bottom plate according to claim 1, characterized in that, The method further includes: The magnitude of corrosion change at the monitored point is determined based on the value of the change curve when the horizontal coordinate is the specified spacing.

3. The online monitoring method for corrosion changes of the tank bottom plate according to claim 1, characterized in that, The determination of the monitoring points on the bottom plate of the storage tank includes: The detection curve is obtained by using ultrasonic guided wave sensor probes distributed on the outer edge plate of the bottom plate of the storage tank. The echo distance of the echo generated by the corrosion of the base plate is determined based on the detection curve. For each of the ultrasonic guided wave sensor probes, a circle is drawn with the location of the ultrasonic guided wave sensor probe as the center and the echo distance determined based on the detection curve of the ultrasonic guided wave sensor probe as the radius. Obtain the intersection point of the circles drawn based on each of the ultrasonic guided wave sensor probes located inside the storage tank, and use the intersection point as the monitoring point.

4. The online monitoring method for corrosion changes of the tank bottom plate according to claim 3, characterized in that, The ultrasonic guided wave sensor probe used to monitor corrosion changes at the monitored point includes: The distance between the point to be monitored and each of the ultrasonic guided wave sensor probes is obtained, and the ultrasonic guided wave sensor probe with the smallest distance value is determined to be the ultrasonic guided wave sensor probe used to monitor the corrosion changes of the point to be monitored.

5. The online monitoring method for corrosion changes of the tank bottom plate according to claim 3, characterized in that, Each of the ultrasonic guided wave sensor probes is pre-embedded in multiple preset positions on the outer edge plate of the tank bottom plate.

6. The online monitoring method for corrosion changes of the tank bottom plate according to claim 1, characterized in that, Before performing the difference calculation between the subsequent detection curve and the previous detection curve, the method further includes: The detection curve is processed to remove interference signals.

7. An online monitoring device for corrosion changes in the bottom plate of a storage tank, characterized in that, include: The determination module is used to: determine the monitoring point on the bottom plate of the storage tank, determine the ultrasonic guided wave sensor probe used to monitor the corrosion changes of the monitoring point, and the distance between the monitoring point and the ultrasonic guided wave sensor probe. The acquisition module is used to: periodically acquire the detection curve of the ultrasonic guided wave sensor probe; for two adjacent detection curves, the difference between the latter detection curve and the former detection curve is calculated to obtain the change curve; wherein, the horizontal axis of the detection curve represents the distance between a point in the ultrasonic guided wave transmission path and the ultrasonic guided wave sensor probe, and the vertical axis of the detection curve represents the signal amplitude. The analysis module is used to determine the corrosion rate of the monitoring point based on the value of the change curve when the horizontal axis value is the specified spacing and the value of the corresponding previous detection curve.

8. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the online monitoring method for corrosion changes of the tank bottom plate as described in any one of claims 1 to 6.

9. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the online monitoring method for corrosion changes of the tank bottom plate as described in any one of claims 1 to 6.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by the processor, it implements the online monitoring method for corrosion changes of the tank bottom plate as described in any one of claims 1 to 6.

Images