CN101441197A - Detection system and detection method of large-scale storage tank bottom corrosion - Google Patents
Detection system and detection method of large-scale storage tank bottom corrosion Download PDFInfo
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- CN101441197A CN101441197A CNA2008101540980A CN200810154098A CN101441197A CN 101441197 A CN101441197 A CN 101441197A CN A2008101540980 A CNA2008101540980 A CN A2008101540980A CN 200810154098 A CN200810154098 A CN 200810154098A CN 101441197 A CN101441197 A CN 101441197A
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Abstract
The invention discloses a large-sized storage-tank bottom corrosion detection system, characterized by comprising a plurality of acoustic emission signal acquisition devices and a primary clock for clock synchronization for the plurality of acoustic emission signal acquisition devices, wherein, each emission signal acquisition device has two acquisition channels, and is connected with an acoustic emission sensor. In addition, the invention also discloses a large-sized storage-tank bottom corrosion detection method by using the detection system. The invention has the advantages that each acoustic emission signal acquisition device is arranged beside the sensor to reduce the distance between the sensor and the instrument, and further to reduce the attenuation and the interference caused by transmission of signals on the cable; the sensor is arranged more easily; the noise from the external power source is lowered by using battery; and each instrument can be used independently and maintained conveniently.
Description
Technical field
The present invention relates to corrode pick-up unit, particularly relate to a kind of large-scale storage tank bottom corrosion detection system and detection method thereof based on acoustic emission.
Background technology
Along with the change of China's energy structure with to the continuous increase of energy demand, oil, the ratio of rock gas in China's energy demand strengthen year by year.Not only storage tank quantity surge, and oil tank design in recent years and construction also develop towards the direction that maximizes.At present, the volume of separate unit storage tank is generally all at 5～15 ten thousand steres in the base, and 10 ten thousand stere storage tanks have become the primary structure that China's oil chemical industry crude oil storage tank is built.Storage tank maximizes and has lot of advantages, but the large-scale storage tank volume is big, distribution is concentrated, and is used for storing inflammable, explosive, poisonous medium more, in case take place to leak or explosion accident, tend to cause catastrophic consequence and serious environmental to pollute, bring massive losses and harm to society.
The storage tank accident is mainly by bottom corrosion with leak and to cause, because the seriousness of its destruction, countries in the world all must be regularly detected the corrosion and the leakage situation of storage tank bottom with the substantive requirements of form of law.In China, according to the requirement of " dangerous material chemical safety management rules " issued by the State Council, must carry out periodic inspection, but the at present concrete time limit and inspection rule also there is not clear and definite requirement to the Hazardous Chemical Substances storage tank; SY/T 592 standard codes, newly-built storage tank detect the availability for the first time and are not more than 10 years, and later round of visits is 5～7 years.For ensureing storage tank safety, developed multiple detection method at present storage tank bottom has been detected, jar baselap sound wave thickness measurement technology, jar end eddy detection technology, Magnetic Flux Leakage Inspecting technology and acoustic emission detection.Wherein first three plants detection technique all needs clear earlier jar, and the staff enters into jar and detects then, cost height so not only, and all can cause harmful effect to staff's physical and mental health.And acoustic emission detection is a kind of online test method, can under situation about not stopping production, assess storage tank bottom, to prolong the sense cycle of " good jar ", the environmental pollution that reduces and avoid causing because of clear jar, make the user obtain direct and potential economic benefit, also can in time find and keep in repair " bad jar " simultaneously, avoid its accidents caused loss that causes.In the acoustic emission detection process, must use Acoustic radiating instrument, present employed Acoustic radiating instrument carries out basic detection principle that bottom corrosion detects as shown in Figure 1, a plurality of calibrate AE sensors 2 are uniformly distributed in the tank skin outside surface of storage tank 1, and the signal that calibrate AE sensor 2 received is transferred to Acoustic radiating instrument 4 by lead 3 again after prime amplifier (among the figure for sensor built-in before put) amplifies.The detection method of this Acoustic radiating instrument is a kind of concentrated acquisition method, promptly on an Acoustic radiating instrument a plurality of passages is arranged, and all calibrate AE sensors all are wired to each passage.
But this Acoustic radiating instrument has following deficiency for the acoustic emission detection of large-scale storage tank: 1, some conductor length need reach rice up to a hundred, and acoustic emission signal is a kind of feeble signal, and decay easily after long Distance Transmission reduces signal to noise ratio (S/N ratio); 2, the lead of growing distance strengthens signal disturbed possibility in transmission course; 3,, in layout and recovery sensor process, bring inconvenience for the staff who implements to detect because lead is very long, and its volume and quality are all very big.4, appliance requires adopts cable power supply, in large-scale oil depot, must carry out setting up of cable in strict accordance with regulation and can use, and has reduced the efficient of detecting operation, and needs to drop into certain man power and material.
Summary of the invention
In order to address the above problem, the object of the present invention is to provide short, the easy to use large-scale storage tank bottom corrosion detection system of a kind of signal transmission distance.
Another purpose that the present invention will solve is to provide a kind of large-scale storage tank bottom corrosion detection system that adopts powered battery, improves detection efficiency.
In addition, the present invention also provides a kind of detection method of using acoustic emission detection system of the present invention to carry out large-scale storage tank bottom corrosion.
The objective of the invention is to be achieved through the following technical solutions: a kind of large-scale storage tank bottom corrosion detection system, it is characterized in that: comprise a plurality of acoustic emission signal collectors and the master clock that is used for a plurality of acoustic emission signal collectors are carried out clock synchronization, each acoustic emission signal collector has two acquisition channels, connects a calibrate AE sensor respectively.
Described acoustic emission signal collector comprises the amplifier that connection calibrate AE sensor and the signal that calibrate AE sensor is received amplify; The bandpass filter that connects amplifier; The A/D converter that is connected with the output terminal of bandpass filter; Be used to control the fpga chip of A/D converter; The EEPROM that is connected with fpga chip; The buffer memory RAM and the high-speed memory that are connected, are used for storage signal with fpga chip; The communication interface that is used for being connected, the acoustic emission signal codan lamp that the temperature compensating crystal oscillator of clock is provided and lights when the storage data for described acoustic emission signal collector with master clock.Described communication interface is made up of clock synchronization trigger pulse passage and data communication interface.
Described master clock comprises main control chip, storer, temperature compensating crystal oscillator, the interface that is connected with PC, the communication interface and the power supply that are connected with the acoustic emission signal collector.Described power supply is a 8V lithium battery group, the capacity 〉=3Ah of lithium battery group.
In the described detection system, the resonance frequency of sensor is 30kHz, sensitivity 〉=-70dB; The passband frequency range of bandpass filter is 20k to 400kHz; Lead is 50 ohm of coaxial cables of length 1 to 2m.
The power supply of described acoustic emission signal collector is the 12v lithium battery, the capacity 〉=3Ah of lithium battery group.
A kind of method of carrying out the bottom corrosion detection with said detecting system may further comprise the steps:
1) with master clock all acoustic emission signal collectors is carried out clock synchronization and parameter setting;
2) by lead each acoustic emission signal collector is connected with 2 calibrate AE sensors respectively, calibrate AE sensor is fixed on the tank skin of large-scale storage tank with couplant and sensor fastener, the sensitive surface of calibrate AE sensor is close on the storage tank shell that has polished smooth, and two calibrate AE sensors that are connected with each acoustic emission signal collector are positioned on the same vertical line and vertical interval is 0.4～0.6m;
3) start the acoustic emission signal collector and begin acquired signal, the data that collect are stored into earlier among the buffer memory RAM, dump in the high-speed memory again;
4) detect finish after, the acoustic emission signal collector reclaimed and with the data transmission of storing in the high-speed memory in PC, in PC, carry out data and merge and handle.
The beneficial effect that the present invention has: 1, each acoustic emission signal collector is placed on the sensor next door, reduced sensor to the distance between the instrument, and then reduced signal and on cable, transmitted decay and the interference that is caused, and make the operation of placement sensor easier, reduced instrument cost; 2, adopt powered battery to reduce the noise that external power supply is introduced; 3, the design objective of acoustic emission signal collector is as the criterion to satisfy bottom corrosion detection needs, thereby has reduced cost; Adopt flash card as storer, reduced power consumption; 4, every instrument can independently use, and is easy to maintenance.
Description of drawings
Fig. 1 is that traditional acoustic emission storage tank bottom corrosion detects schematic diagram;
Fig. 2 is that large-scale storage tank bottom corrosion of the present invention detects schematic diagram;
Fig. 3 is the structured flowchart of acoustic emission signal collector in the large-scale storage tank bottom corrosion detection system of the present invention;
Fig. 4 is the circuit structure block diagram of master clock in the large-scale storage tank bottom corrosion detection system of the present invention.
Embodiment
Below in conjunction with accompanying drawing and instantiation large-scale storage tank bottom corrosion pick-up unit of the present invention is elaborated.
As shown in Figure 2, large-scale storage tank bottom corrosion detection system of the present invention comprises a plurality of acoustic emission signal collectors 5, and each acoustic emission signal collector 5 connects two leads 7 respectively, and these two leads respectively connect a calibrate AE sensor 6 respectively.In addition, though it is not shown in the figures, this detection system also comprises a master clock that is used for a plurality of acoustic emission signal collectors are carried out clock synchronization, master clock is responsible for needing the acoustic emission signal collector of work to carry out clock synchronization to all, and, reclaim the signal that each collector writes down for the acoustic emission signal collector is provided with acquisition parameter.Can carry out simultaneously also can carrying out synchronously the acoustic emission signal collector one by one synchronously to a plurality of acoustic emission signal collectors simultaneously with master clock with master clock.The 50 ohm of coaxial cables of lead 7 preferred employings that connect acoustic emission signal collector 3 and calibrate AE sensor 6.The resonance frequency of calibrate AE sensor 6 is preferably 30kHz, sensitivity should 〉=-70dB (reference units 1v/ μ Bar).
Fig. 3 is the structured flowchart of acoustic emission signal collector in the detection system of the present invention.As shown in the figure, acoustic emission signal collector 5 comprises: the amplifier 8 that connection sensor and the signal that sensor is received amplify; The bandpass filter 9 that connects amplifier 8; The A/D converter 10 that is connected with the output terminal of bandpass filter 9; Be used to control FPGA (field programmable gate array) chip 11 of A/D converter 10; The EEPROM (Erasable Programmable Read Only Memory EPROM) 12 that is connected with fpga chip 11; Be connected, be used for buffer memory RAM (random access memory) 17 and the high-speed memory 15 of storage signal with fpga chip 11; Be used for communication interface 13 that is connected with master clock and the temperature compensating crystal oscillator 14 that clock is provided for described acoustic emission signal collector.Described communication interface 13 comprises two parts, and a part triggers lead for clock synchronization, and another part is a data communication interface.The acoustic emission signal codan lamp of lighting when in addition, described acoustic emission signal collector also is included in the storage data 14.The power supply of acoustic emission signal collector preferably is adopted as 12V lithium battery group, and for satisfying the on-the-spot disposable needs that detect more than 2 hours, battery electric quantity needs more than 3Ah.
As shown in Figure 4, described master clock comprises main control chip, storer, temperature compensating crystal oscillator, the interface that is connected with PC, the communication interface and the power supply that are connected with the acoustic emission signal collector.Described power supply adopts battery, preferably uses 8V lithium battery group, and capacity needs more than 3Ah, can long-play and be not subjected to the restriction of place to use with the clock that guarantees master clock.Can adopt USB or Ethernet interface etc. with the interface of PC.For the timing tracking accuracy that guarantees master clock and Acoustic radiating instrument reaches 10 delicate, in the time of synchronously, master clock is wired to Acoustic radiating instrument, master clock is transferred to Acoustic radiating instrument with the value after 1 second future of its present clock value by data communication interface earlier, treat just to send synchronization pulse by clock synchronization triggering lead immediately after the master clock clock arrives this value, Acoustic radiating instrument just begins to start its clock internal after receiving this signal.
The principle of work of acoustic emission signal collector is: after acoustic emission signal is received by sensor 6, be transferred in the instrument through lead 8, at first being exaggerated device 8 amplifies, enlargement factor can be by being provided with adjustment, to adapt to different working environments, generally be made as three kinds of 10 times (20dB), 100 times (40dB), 1000 times (60dB), amplifier 8 output terminals are connected to bandpass filter 9, this wave filter is selected the Butterworth mode filter for use, and passband frequency range is 20k to 400kHz.Wave filter 10 output terminals connect A/D converter 11, and A/D converter 11 basic parameters comprise: 16 precision bipolaritys, and reference voltage ± 10V, high sampling rate is 2MS/S, A/D converter is by fpga chip 12 controls.Fpga chip 12 is by the control to A/D converter, with data read in the buffer memory of inside, afterwards by judging that whether signal is greater than threshold value, whether decision receives useful signal, then inquire about present clock if receive useful signal, begin signal is stored into earlier among the buffer memory RAM 17, dump to again in the high-speed memory 15.Preferred buffer memory RAM need reach the memory space of 128kbit, and storer 15 can be selected technical grade CF card for use, and read or write speed need reach more than the 10MB/S.In the time of the storage data, light acoustic emission signal codan lamp 16, be lower than threshold value continuously until signal and stop storage after a period of time, pilot lamp 16 goes out.Fpga chip 12 is connected with an EEPROM 12, the program and the collection that are used to store FPGA are provided with parameter, gather parameter is set comprises sampling rate, threshold value, maximum duration, once clash into signal record length, peak value qualification time, bump qualification time, bump blocking time etc.The parameter-definition algorithm can be consulted pertinent literature.For realizing that data reclaim and clock synchronization, have communication interface 13 between Acoustic radiating instrument and the master clock.This communication interface comprises two parts, a part triggers lead for clock synchronization, and another part is a data communication interface, and data communication interface can be taked various ways, for guaranteeing big data quantity transmission reliably at a high speed, preferably adopt as high speed data transmission interfaces such as Ethernet interface, USB interface.
Below large-scale storage tank bottom corrosion detection method of the present invention is described.
Before beginning to collection in worksite, at first need all acoustic emission signal collectors of participating in detection to be carried out clock synchronization with master clock, accurate to guarantee the measured signal time difference of each instrument, and then guarantee that bearing accuracy to signal source, the clock accuracy of acoustic emission signal collector need reach 10 delicate.During work, the staff can give an order to master clock by PC, comprises master clock clock value, the setting of Acoustic radiating instrument acquisition parameter, the Acoustic radiating instrument that is connected on the master clock is carried out clock synchronization etc.In testing process, acoustic emission signal collector 5 is placed on the ground at storage tank edge, connect calibrate AE sensor 6 by 1 to 2m long 50 ohm of coaxial cables 8, calibrate AE sensor 6 is affixed on the tank skin of storage tank by couplant, two calibrate AE sensors that are connected with each acoustic emission signal collector should be positioned on the same vertical line and vertical interval is 0.4～0.6m, and preferred vertical interval is 0.5m.The start-up operation of gathering can go out by the collection of the startup on acoustic emission signal collector button to finish, and the collection start-up operation of employed a plurality of acoustic emission signal collectors need not to finish simultaneously, the data of front a period of time can be removed during data processing.After detection finishes, instrument reclaimed and with data transmission in PC, utilize known method in PC, to carry out data and merge and handle.
Claims (10)
1. large-scale storage tank bottom corrosion detection system, it is characterized in that: comprise a plurality of acoustic emission signal collectors and the master clock that is used for a plurality of acoustic emission signal collectors are carried out clock synchronization, each acoustic emission signal collector has two acquisition channels, connects a calibrate AE sensor respectively.
2. detection system according to claim 1 is characterized in that: described acoustic emission signal collector comprises the amplifier that connection calibrate AE sensor and the signal that calibrate AE sensor is received amplify; The bandpass filter that connects amplifier; The A/D converter that is connected with the output terminal of bandpass filter; Be used to control the fpga chip of A/D converter; The EEPROM that is connected with fpga chip; The buffer memory RAM and the high-speed memory that are connected, are used for storage signal with fpga chip; The communication interface that is used for being connected, the acoustic emission signal codan lamp that the temperature compensating crystal oscillator of clock is provided and lights when the storage data for described acoustic emission signal collector with master clock.
3. detection system according to claim 2 is characterized in that: described communication interface is made up of clock synchronization trigger pulse passage and data communication interface.
4. detection system according to claim 1 is characterized in that: described master clock comprises main control chip, storer, temperature compensating crystal oscillator, the interface that is connected with PC, the communication interface and the power supply that are connected with the acoustic emission signal collector.
5. detection system according to claim 4 is characterized in that: described power supply is a 8V lithium battery group, the capacity 〉=3Ah of lithium battery group.
6. according to each described detection system in the claim 1～7, it is characterized in that: the resonance frequency of described sensor is 30kHz, sensitivity 〉=-70dB.
7. according to each described detection system in the claim 1～7, it is characterized in that: the passband frequency range of described bandpass filter is 20k to 400kHz.
8. according to each described detection system in the claim 1～7, it is characterized in that: described lead is 50 ohm of coaxial cables of length 1 to 2m.
9. according to each described detection system in the claim 1～7, it is characterized in that the power supply of described acoustic emission signal collector is a 12v lithium battery group, the capacity 〉=3Ah of lithium battery group.
10. one kind is carried out the method that bottom corrosion detects with the described detection system of claim 1, may further comprise the steps:
1) with master clock all acoustic emission signal collectors is carried out clock synchronization and parameter setting;
2) by lead each acoustic emission signal collector is connected with 2 calibrate AE sensors respectively, calibrate AE sensor is fixed on the tank skin of large-scale storage tank with couplant and sensor fastener, the sensitive surface of calibrate AE sensor is close on the storage tank shell that has polished smooth, and two calibrate AE sensors that are connected with each acoustic emission signal collector are positioned on the same vertical line and vertical interval is 0.4～0.6m;
3) start the acoustic emission signal collector and begin acquired signal, the data that collect are stored into earlier among the buffer memory RAM, dump in the high-speed memory again;
4) detect finish after, the acoustic emission signal collector reclaimed and with the data transmission of storing in the high-speed memory in PC, in PC, carry out data and merge and handle.
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| CN2008101540980A CN101441197B (en) | 2008-12-15 | 2008-12-15 | Detection system and detection method of large-scale storage tank bottom corrosion |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102565195A (en) * | 2012-01-10 | 2012-07-11 | 税爱社 | Connection-free type acoustic emission detector |
| CN102735757A (en) * | 2012-06-21 | 2012-10-17 | 中国人民解放军后勤工程学院 | Synchronous method of independent channel offline explosion-proof sound emission instrument, and device thereof |
| CN103440042A (en) * | 2013-08-23 | 2013-12-11 | 天津大学 | Virtual keyboard based on sound localization technology |
| CN104133000A (en) * | 2014-07-02 | 2014-11-05 | 上海大学 | Material corrosion detection apparatus and method |
| CN105606706A (en) * | 2016-01-15 | 2016-05-25 | 西南石油大学 | Retractable automatic-spin defect detecting and positioning device for storage tank walls |
| CN104132999B (en) * | 2014-07-31 | 2017-01-04 | 中国人民解放军后勤工程学院 | The cylindrical fluid reservoir base plate sound localization method of ripple is arrived based on early stage |
| CN109060957A (en) * | 2018-07-11 | 2018-12-21 | 重庆大学 | In conjunction with the acoustically-driven storage tank bottom plate defect inspection method of storage tank storage medium |
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2008
- 2008-12-15 CN CN2008101540980A patent/CN101441197B/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102565195A (en) * | 2012-01-10 | 2012-07-11 | 税爱社 | Connection-free type acoustic emission detector |
| CN102565195B (en) * | 2012-01-10 | 2013-12-18 | 税爱社 | Connection-free type acoustic emission detector |
| CN102735757A (en) * | 2012-06-21 | 2012-10-17 | 中国人民解放军后勤工程学院 | Synchronous method of independent channel offline explosion-proof sound emission instrument, and device thereof |
| CN102735757B (en) * | 2012-06-21 | 2017-04-19 | 中国人民解放军后勤工程学院 | Synchronous method of independent channel offline explosion-proof sound emission instrument, and device thereof |
| CN103440042A (en) * | 2013-08-23 | 2013-12-11 | 天津大学 | Virtual keyboard based on sound localization technology |
| CN103440042B (en) * | 2013-08-23 | 2016-05-11 | 天津大学 | A kind of dummy keyboard based on acoustic fix ranging technology |
| CN104133000A (en) * | 2014-07-02 | 2014-11-05 | 上海大学 | Material corrosion detection apparatus and method |
| CN104133000B (en) * | 2014-07-02 | 2017-10-24 | 上海大学 | A kind of material corrosion detection means and method |
| CN104132999B (en) * | 2014-07-31 | 2017-01-04 | 中国人民解放军后勤工程学院 | The cylindrical fluid reservoir base plate sound localization method of ripple is arrived based on early stage |
| CN105606706A (en) * | 2016-01-15 | 2016-05-25 | 西南石油大学 | Retractable automatic-spin defect detecting and positioning device for storage tank walls |
| CN109060957A (en) * | 2018-07-11 | 2018-12-21 | 重庆大学 | In conjunction with the acoustically-driven storage tank bottom plate defect inspection method of storage tank storage medium |
| CN109060957B (en) * | 2018-07-11 | 2020-10-09 | 重庆大学 | Acoustic excitation storage tank bottom plate defect detection method combined with storage tank storage medium |
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Assignee: Hebei Jingye Chemical Co., Ltd. Assignor: Tianjin University Contract record no.: 2012110000053 Denomination of invention: Detection system and detection method of large-scale storage tank bottom corrosion Granted publication date: 20110629 License type: Exclusive License Open date: 20090527 Record date: 20120319 |
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