CN108844963B - Online monitoring system and method for corrosion defects of bottom plate of large storage tank - Google Patents
Online monitoring system and method for corrosion defects of bottom plate of large storage tank Download PDFInfo
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- CN108844963B CN108844963B CN201810652709.8A CN201810652709A CN108844963B CN 108844963 B CN108844963 B CN 108844963B CN 201810652709 A CN201810652709 A CN 201810652709A CN 108844963 B CN108844963 B CN 108844963B
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- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
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Abstract
The invention provides a large-scale storage tank bottom plate corrosion defect on-line monitoring system and a method thereof, wherein the detection system comprises: the device comprises an excitation device, a sensing device and a processing device; the excitation device is arranged on the exposed part of the edge of the bottom plate of the storage tank or on the outer wall of the storage tank; the sensing device adopts a distributed optical fiber sensing system or an acoustic emission sensor; when the sensing device adopts a distributed optical fiber sensing system, sensing optical fibers of the distributed optical fiber sensing system are distributed on the inner wall of the storage tank bottom plate; when the sensing device adopts an acoustic emission sensor, the acoustic emission sensor is suspended in the middle of the inner cavity of the storage tank through a suspension cable; the signal output part of the sensing device is connected with the processing device; the beneficial technical effects of the invention are as follows: the technology can carry out on-line monitoring on the defects of the storage tank bottom plate, and has the advantages of simple monitoring operation, lower cost and higher detection and positioning accuracy.
Description
Technical Field
The invention relates to a storage tank bottom plate corrosion defect online monitoring technology, in particular to a large-scale storage tank bottom plate corrosion defect online monitoring system and method.
Background
With the rapid development of related industrial technologies such as petroleum storage tanks in China, the demand of plates required by structures such as storage tank bottom plates and tank walls is rapidly increased; however, metal plates such as iron plates and steel plates inevitably have defects such as corrosion and falling off during long-term production and use, and oil storage leakage is caused in severe cases.
The existing storage tank corrosion defect detection technology mainly comprises an artificial observation method, a vortex detection method, a magnetic leakage detection method, an acoustic emission method, a distributed optical fiber vibration measurement method and an ultrasonic guided wave detection method;
the manual observation method is low in detection precision, needs to consume a lot of manpower and material resources, is low in working efficiency, can only judge whether serious leakage occurs, cannot determine the position of a leakage point, and cannot realize online monitoring; the eddy current detection method and the magnetic flux leakage detection method cannot realize continuous monitoring, and the tank cleaning operation of the storage tank is required for each detection, so that the detection is very troublesome;
the ultrasonic guided wave detection method can detect corrosion defects of a small storage tank structure under the condition of no stop of production, but for a large storage tank, because the storage tank is large in size, a plurality of welding seams exist in the storage tank, and the types of the welding seams also have diversity, such as butt welding seams, lap welding seams, T-shaped fillet welding seams at edge plates and the like; the ultrasonic guided wave sensor array is usually arranged outside the tank body, and due to the fact that a plurality of welding seams exist, ultrasonic guided waves are scattered at a plurality of welding seams, the ultrasonic guided waves cannot penetrate into the storage tank bottom plate, meanwhile, the sensor array cannot receive defect information related to the storage tank bottom plate, and therefore defects on the storage tank bottom plate cannot be accurately identified and located; the acoustic emission method and the distributed optical fiber vibration measurement method belong to distributed measurement systems, sensors or sensing optical fibers can be arranged on the lower surface of a storage tank bottom plate, so that the health state of the storage tank bottom plate can be evaluated under the condition of no production stop, however, both the acoustic emission method and the distributed optical fiber vibration measurement method can only play a role under the condition that leakage occurs, and defects which are still in a development stage and do not form leakage, such as steel plate thinning, weld crack growth and the like, cannot be detected, so that the acoustic emission method and the distributed optical fiber vibration measurement method cannot be used for monitoring and early warning.
Disclosure of Invention
Aiming at the problems in the background art, the invention provides an online monitoring system for corrosion defects of a bottom plate of a large storage tank, which is innovative in that: the large-scale storage tank bottom plate corrosion defect on-line measuring system includes: the large-scale storage tank bottom plate corrosion defect on-line measuring system includes: the device comprises an excitation device, a sensing device and a processing device; the excitation device is arranged on the exposed part of the edge of the bottom plate of the storage tank or on the outer wall of the storage tank; the sensing device adopts a distributed optical fiber sensing system or an acoustic emission sensor; when the sensing device adopts a distributed optical fiber sensing system, sensing optical fibers of the distributed optical fiber sensing system are distributed on the inner wall of the storage tank bottom plate; when the sensing device adopts the acoustic emission sensor, the acoustic emission sensor is suspended in the middle of the inner cavity of the storage tank through a suspension cable (the electrical lead of the acoustic emission sensor can be arranged along the suspension cable, or the electrical lead of the acoustic emission sensor is directly used as the suspension cable); and the signal output part of the sensing device is connected with the processing device.
The principle of the invention is as follows: distributed optical fiber sensing systems and acoustic emission sensors are common sensing devices in the prior art; when the sensing device adopts the acoustic emission sensor, the acoustic emission sensor is arranged in the storage tank, so that the acoustic emission sensor can better receive scattering information from the bottom plate of the storage tank; when the sensing device adopts a distributed optical fiber sensing system, the excitation is actively applied through the excitation device, the storage tank bottom plate can be actively detected, and the problem that the existing distributed optical fiber vibration measurement method can only play a role under the leakage condition is solved; in specific application, the ultrasonic guided wave sensor array can be combined with the existing ultrasonic guided wave sensor array, the storage tank bottom plate is detected by the ultrasonic guided wave sensor array, and parts except the storage tank bottom plate are detected by the ultrasonic guided wave sensor array, so that the structural health state of the whole storage tank can be conveniently monitored on line, the hidden defect danger can be found in time, and the treatment can be carried out in time after the hidden defect danger occurs.
In specific application, a newly-built storage tank can be built, the monitoring system can be built at the same time, the in-service storage tank can be cleaned once (the subsequent monitoring process does not need to be cleaned again), and then the sensing device is arranged in the storage tank; after the monitoring system is arranged, the health detection of the storage tank structure can be completed in the subsequent operation process under the condition that the normal use of the storage tank is not influenced, the detection operation is convenient, and the cost is low.
Preferably, when the sensing device adopts an acoustic emission sensor, a plurality of acoustic emission sensors are suspended in the storage tank, the spacing distance between each acoustic emission sensor and the bottom plate of the storage tank is equal, and the acoustic emission sensors are distributed on the cross section of the storage tank in an array form; the array is a cross-shaped array, a circular array or a matrix.
Preferably, the excitation device is a plurality of excitation devices, and the excitation devices are distributed along the circumferential direction of the storage tank. A plurality of excitation devices are arranged, so that various signals at different excitation positions can be obtained, and the detection accuracy and comprehensiveness can be effectively improved.
Based on the system, the invention also provides an online monitoring method for the corrosion defects of the bottom plate of the large storage tank, and the related hardware is as described above; the specific monitoring method comprises the following steps:
1) after the exciting device, the sensing device and the processing device are installed, putting the storage tank into normal use;
2) and under the condition that the medium in the storage tank is in a static state, performing primary detection: controlling an excitation device to apply excitation to a storage tank to generate ultrasonic guided waves, synchronously acquiring detection signals by a sensing device, transmitting the detection signals to a processing device, and storing the detection signals as reference signals by the processing device;
3) in the follow-up operation process, control excitation device periodically and exert the excitation to the storage tank and produce the supersound guided wave to obtain corresponding monitoring signal through sensing device, then transmit monitoring signal to processing apparatus, processing apparatus subtracts monitoring signal and reference signal, then gets the envelope and judges whether there is the ripples package to appear on the envelope: if no wave packet appears, determining that no defect appears on the bottom plate of the storage tank; if the wave packet appears, the storage tank bottom plate is considered to have a defect, and then the position of the defect is positioned according to a flight time algorithm.
The signal processing means of the distributed optical fiber sensing system and the acoustic emission sensor, as well as the envelope extraction and the time-of-flight algorithm are all the prior art, and therefore detailed description of specific processing modes is omitted herein.
The beneficial technical effects of the invention are as follows: the technology can carry out on-line monitoring on the defects of the storage tank bottom plate, and has the advantages of simple monitoring operation, lower cost and higher detection and positioning accuracy.
Drawings
FIG. 1 is a schematic view of the detection principle of the present invention;
FIG. 2 is a schematic diagram of the layout position of an acoustic emission sensor;
FIG. 3 is a schematic diagram I (circular array) of the arrangement of the acoustic emission sensors;
FIG. 4 is a schematic diagram (cross-shaped array) of the arrangement mode of the acoustic emission sensors;
FIG. 5 is a schematic diagram III (matrix) of the arrangement mode of the acoustic emission sensors.
Detailed Description
The utility model provides a large-scale storage tank bottom plate corrosion defect on-line monitoring system which innovation lies in: the large-scale storage tank bottom plate corrosion defect on-line measuring system includes: the device comprises an excitation device, a sensing device and a processing device; the excitation device is arranged on the exposed part of the edge of the bottom plate of the storage tank or on the outer wall of the storage tank; the sensing device adopts a distributed optical fiber sensing system or an acoustic emission sensor; when the sensing device adopts a distributed optical fiber sensing system, sensing optical fibers of the distributed optical fiber sensing system are distributed on the inner wall of the storage tank bottom plate; when the sensing device adopts an acoustic emission sensor, the acoustic emission sensor is suspended in the middle of the inner cavity of the storage tank through a suspension cable; and the signal output part of the sensing device is connected with the processing device.
Furthermore, when the sensing device adopts the acoustic emission sensors, a plurality of acoustic emission sensors are suspended in the storage tank, the spacing distance between each acoustic emission sensor and the bottom plate of the storage tank is equal, and the acoustic emission sensors are distributed on the cross section of the storage tank in an array form; the array is a cross-shaped array, a circular array or a matrix.
Further, the excitation device is a plurality of excitation devices, and the excitation devices are distributed along the circumferential direction of the storage tank.
An online monitoring method for corrosion defects of a bottom plate of a large storage tank relates to hardware comprising: the device comprises an excitation device, a sensing device and a processing device; the excitation device is arranged on the exposed part of the edge of the bottom plate of the storage tank or on the outer wall of the storage tank; the sensing device adopts a distributed optical fiber sensing system or an acoustic emission sensor; when the sensing device adopts a distributed optical fiber sensing system, sensing optical fibers of the distributed optical fiber sensing system are distributed on the inner wall of the storage tank bottom plate; when the sensing device adopts an acoustic emission sensor, the acoustic emission sensor is suspended in the middle of the inner cavity of the storage tank through a suspension cable; the signal output part of the sensing device is connected with the processing device;
the innovation lies in that: the large-scale storage tank bottom plate corrosion defect on-line monitoring method comprises the following steps:
1) after the exciting device, the sensing device and the processing device are installed, putting the storage tank into normal use;
2) and under the condition that the medium in the storage tank is in a static state, performing primary detection: controlling an excitation device to apply excitation to a storage tank to generate ultrasonic guided waves, synchronously acquiring detection signals by a sensing device, transmitting the detection signals to a processing device, and storing the detection signals as reference signals by the processing device;
3) in the follow-up operation process, control excitation device periodically and exert the excitation to the storage tank and produce the supersound guided wave to obtain corresponding monitoring signal through sensing device, then transmit monitoring signal to processing apparatus, processing apparatus subtracts monitoring signal and reference signal, then gets the envelope (when adopting acoustic emission sensor, should also carry out filtering process before getting the envelope, in order to reduce the burr on the envelope) and judge whether there is the wave packet on the envelope to appear: if no wave packet appears, determining that no defect appears on the bottom plate of the storage tank; if the wave packet appears, the storage tank bottom plate is considered to have a defect, and then the position of the defect is positioned according to a flight time algorithm.
Furthermore, when the sensing device adopts the acoustic emission sensors, a plurality of acoustic emission sensors are suspended in the storage tank, the spacing distance between each acoustic emission sensor and the bottom plate of the storage tank is equal, and the acoustic emission sensors are distributed on the cross section of the storage tank in an array form; the array is a cross-shaped array, a circular array or a matrix.
Further, the number of the excitation devices is multiple, and the excitation devices are distributed along the circumferential direction of the storage tank; in a single detection period, a plurality of excitation devices sequentially apply excitation, and the sensing devices respectively acquire corresponding detection signals.
Claims (6)
1. The utility model provides a large-scale storage tank bottom plate corrosion defect on-line monitoring system which characterized in that: the large-scale storage tank bottom plate corrosion defect on-line measuring system includes: the device comprises an excitation device, a sensing device and a processing device; the excitation device is arranged on the exposed part of the edge of the bottom plate of the storage tank or on the outer wall of the storage tank; the sensing device adopts a distributed optical fiber sensing system or an acoustic emission sensor; when the sensing device adopts a distributed optical fiber sensing system, sensing optical fibers of the distributed optical fiber sensing system are distributed on the inner wall of the storage tank bottom plate; when the sensing device adopts an acoustic emission sensor, the acoustic emission sensor is suspended in the middle of the inner cavity of the storage tank through a suspension cable; and the signal output part of the sensing device is connected with the processing device.
2. The large-scale storage tank bottom plate corrosion defect on-line monitoring system of claim 1, characterized in that: when the sensing device adopts an acoustic emission sensor, a plurality of acoustic emission sensors are suspended in the storage tank, the spacing distance between each acoustic emission sensor and the bottom plate of the storage tank is equal, and the acoustic emission sensors are distributed on the cross section of the storage tank in an array form; the array is a cross-shaped array, a circular array or a matrix.
3. The large-scale storage tank bottom plate corrosion defect on-line monitoring system of claim 1 or 2, characterized in that: the excitation device is a plurality of excitation devices which are distributed along the circumferential direction of the storage tank.
4. An online monitoring method for corrosion defects of a bottom plate of a large storage tank relates to hardware comprising: the device comprises an excitation device, a sensing device and a processing device; the excitation device is arranged on the exposed part of the edge of the bottom plate of the storage tank or on the outer wall of the storage tank; the sensing device adopts a distributed optical fiber sensing system or an acoustic emission sensor; when the sensing device adopts a distributed optical fiber sensing system, sensing optical fibers of the distributed optical fiber sensing system are distributed on the inner wall of the storage tank bottom plate; when the sensing device adopts an acoustic emission sensor, the acoustic emission sensor is suspended in the middle of the inner cavity of the storage tank through a suspension cable; the signal output part of the sensing device is connected with the processing device;
the method is characterized in that: the large-scale storage tank bottom plate corrosion defect on-line monitoring method comprises the following steps:
1) after the exciting device, the sensing device and the processing device are installed, putting the storage tank into normal use;
2) and under the condition that the medium in the storage tank is in a static state, performing primary detection: controlling an excitation device to apply excitation to a storage tank to generate ultrasonic guided waves, synchronously acquiring detection signals by a sensing device, transmitting the detection signals to a processing device, and storing the detection signals as reference signals by the processing device;
3) in the follow-up operation process, control excitation device periodically and exert the excitation to the storage tank and produce the supersound guided wave to obtain corresponding monitoring signal through sensing device, then transmit monitoring signal to processing apparatus, processing apparatus subtracts monitoring signal and reference signal, then gets the envelope and judges whether there is the ripples package to appear on the envelope: if no wave packet appears, determining that no defect appears on the bottom plate of the storage tank; if the wave packet appears, the storage tank bottom plate is considered to have a defect, and then the position of the defect is positioned according to a flight time algorithm.
5. The large-scale storage tank bottom plate corrosion defect on-line monitoring method according to claim 4, characterized in that: when the sensing device adopts an acoustic emission sensor, a plurality of acoustic emission sensors are suspended in the storage tank, the spacing distance between each acoustic emission sensor and the bottom plate of the storage tank is equal, and the acoustic emission sensors are distributed on the cross section of the storage tank in an array form; the array is a cross-shaped array, a circular array or a matrix.
6. The on-line monitoring method for corrosion defects of the bottom plate of the large-scale storage tank according to claim 4 or 5, characterized in that: the number of the excitation devices is multiple, and the excitation devices are distributed along the circumferential direction of the storage tank; in a single detection period, a plurality of excitation devices sequentially apply excitation, and the sensing devices respectively acquire corresponding detection signals.
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| CN109596623B (en) * | 2018-12-21 | 2021-07-06 | 无锡先导智能装备股份有限公司 | Defect detection method and device |
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| CN110702787A (en) * | 2019-10-17 | 2020-01-17 | 常州大学 | Large-scale storage tank bottom plate corrosion immersion acoustic global detection method |
| CN110646513B (en) * | 2019-10-17 | 2021-11-12 | 重庆大学 | Structural body bottom plate health state detection method based on guided wave combined excitation |
| CN111257429B (en) * | 2020-03-24 | 2023-07-04 | 济南大学 | Cobweb-like sensor array layout method and application thereof in concrete health monitoring |
| CN112945282B (en) * | 2021-02-04 | 2022-04-05 | 中国特种设备检测研究院 | Large-scale crude oil storage tank large-angle weld defect optical fiber monitoring method and system |
| CN113063518B (en) * | 2021-03-24 | 2022-07-26 | 山东特种设备检验检测集团有限公司 | Atmospheric storage tank bottom plate corrosion monitoring method based on optical fiber sensing |
| CN114740087A (en) * | 2022-03-30 | 2022-07-12 | 浙江工业大学 | Acoustic emission anti-interference gas cylinder defect positioning method and anti-interference test box |
| CN114740082B (en) * | 2022-04-12 | 2024-10-18 | 中国特种设备检测研究院 | Method and system for determining online corrosion degree of storage tank bottom plate based on data fusion |
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