CN102721749A - Acoustic emission detection device and method for detecting bottom of storage tank in confined space - Google Patents
Acoustic emission detection device and method for detecting bottom of storage tank in confined space Download PDFInfo
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- CN102721749A CN102721749A CN2012102354406A CN201210235440A CN102721749A CN 102721749 A CN102721749 A CN 102721749A CN 2012102354406 A CN2012102354406 A CN 2012102354406A CN 201210235440 A CN201210235440 A CN 201210235440A CN 102721749 A CN102721749 A CN 102721749A
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Abstract
The invention discloses an acoustic emission detection device for detecting the bottom of a storage tank in a confined space. The acoustic emission detection device comprises a plurality of acoustic emission sensors uniformly arranged on the same circumference of the wall of the storage tank, explosion-proof cable devices connected with the acoustic emission sensors respectively, an acoustic emission host electrically connected with the explosion-proof cable devices, a computer electrically connected with the acoustic emission host, and a lead refill, wherein the computer is used for receiving signals of all the acoustic emission sensors, which are processed by the acoustic emission host and judging the situation that the acoustic emission sensors detect the bottom of the storage tank in the area; and the lead refill is broken on the wall of the storage tank and gives out a breakage signal to serve as an analog source capable of repeatedly sending elastic waves, so as to achieve calibration of the acoustic emission host, channel sensitivities of the explosion-proof devices and attenuation measurement and positioning. The acoustic emission detection device provided by the invention can achieve nondestructive detection on the bottom of the storage tank without influencing the normal operation of the storage tank, and has the advantages of high security, good economical efficiency and reliable detection result.
Description
Technical field
The invention belongs to technical field of nondestructive testing, be specifically related to the safety protecting method and the utensil of the jar end acoustic emission detection of a kind of storage tank in restricted clearance.
Background technology
Falling over each other in the deposit of global Oil Strategy resource, storage tank is used in a large number.Along with the increase of tenure of use, the oil tank leakage problems becomes increasingly conspicuous.The oil tank seepage not only makes oil plant run off and causes energy dissipation, also can bring dangerous generation such as fire, blast, pollution.Show according to data, find when storage tank detects that the tank bottom corrosion of storage tank is the most serious.Therefore the emphasis of storage tank corrosion detection, maintenance generally is placed on the base plate.What China's tradition jar end defects detection adopted is regular off-line Non-Destructive Testing.Testing process comprises operations such as shut-down, turned letter, cleaning, rust cleaning (even tearing insulation open) and detection, mainly adopts technology such as ultrasonic, magnetic and vacuum detecting, has deficiencies such as expense is high, grow detection time.Many oil depots are built in the 60 to 70's of last century mostly at the storage tank of labour; For improve the viability great majority be built in sealable jar indoor because the demand of supply guarantee task, most of oil tanks are in the oil storage running status for a long time; Long in the labour time; Much near or surpass design service life, a considerable amount of storage tank all exist the corrosion default problem of hidden danger such as corrosion-deformation in various degree, particularly tank bottom the most outstanding.And regularly open a jar pacing items that detects and be difficult to find oil storage safety and Environmental security that tank bottom perforation seepage is threatening oil depot constantly owing to usually not possessing.Thereby online measuring technique highlights its advantage day by day.
Compare with offline inspection, online detection does not need operations such as shut-down, turned letter, cleaning and rust cleaning, and has the advantage that detection time is short, expense is low.At present, the storage tank bottom plate on-line detection method mainly contains robot, supersonic guide-wave, jar outer leakage and the acoustic emission visited in the world.The robot detection technique is had relatively high expectations to the security of checkout equipment, controllability, sealing etc., needs the support of multiple new and high technology and high-level industrial foundation.The technical manual of the relevant oil tank detection method in countries in the world is not also advanced a jar clause that detects about the employing robot at present, the domestic report that uses robot to carry out the online detection of storage tank of not seeing as yet.And at present, the technological many places of detecting at the bottom of the using ultrasound guided wave carries out jar in the world are in the research exploratory stage, and it is higher to detecting surface requirements, can not matcoveredn, and the complete detection at the bottom of can't realizing jar, and testing result can't be distinguished External Defect and inherent vice.For large-scale storage tank,, thereby only be fit to the detection of small-sized storage tank bottom plate or large-scale storage tank bottom edge plate owing to the serious attenuation of base plate weld seam to guided wave.Oil tank is visited the technological technological jar subject matter of chamber storage tank detection that is used for of tracer method, resistance spy leakage method, ultrasonic leak detection method, mass balance leak detecting, ground soil sample analytic approach or the like jar outer spy leakage that mainly contains of leakage: jar chamber complex structure; Limited space; Drilling technique is complicated; And domestic no similar technical research basis does not have corresponding rule and standard yet.
Summary of the invention
To the problems referred to above, the purpose of this invention is to provide the acoustic emission detection system and the method for tank bottom in a kind of restricted clearance, the present invention is under the normal operation that does not influence storage tank; Storage tank is carried out Non-Destructive Testing; Have safe, good economy performance, testing result is reliable.
The technical scheme that realizes above-mentioned purpose is following:
The acoustic emission detection system of tank bottom in the restricted clearance; Comprise: be evenly arranged in a plurality of calibrate AE sensors on the same horizontal circumference of tank wall; Each sensor is responsible for detecting a zone on the storage tank, and these calibrate AE sensors convert the mechanical vibration of storage tank into electric signal; And
Each calibrate AE sensor all connects an anti-explosion cable device, and the anti-explosion cable device transmits the electric signal of calibrate AE sensor output; And
With the acoustic emission main frame that each anti-explosion cable device is electrically connected, the elastic wave of this acoustic emission main frame emission is propagated the surface that arrives storage tank through the anti-explosion cable device, causes the mechanical vibration that supply calibrate AE sensor to survey storage tank bottom; And
The computing machine that is electrically connected with the acoustic emission main frame, reception comes from the signal of each calibrate AE sensor of acoustic emission host process, judges that each calibrate AE sensor detects the situation of the tank bottom in this zone; And
Lead for retractable pencil fractures on storage tank, sends the signal that fractures as the dummy source that can repeat to send elastic wave, carries out the calibration of acoustic emission main frame, the calibration of anti-explosion cable device channel sensitivity, attenuation measurement and location calibration.
Said anti-explosion cable device comprises anti-explosion cable; This anti-explosion cable is made up of the first flame proof box, the second flame proof box, cable; Wherein be provided with the safety barrier circuit in the first flame proof box body; Be provided with prime amplifier in the second flame proof box, safety barrier circuit and prime amplifier are electrically connected, the output terminal stube cable line of prime amplifier.
Be provided with portable line between the first flame proof box and the second flame proof box.
Said anti-explosion cable device also comprises a reel; This reel is made up of hand-held rod, support, rolling wheel and flame proof box basket; One end of hand-held rod is supported on the support with being connected of support, rolling wheel rotationally, and the axial end of rolling wheel has been provided with crank, cable exit and press strip.
Said calibrate AE sensor is fixed on the storage tank wall through the magnetic deck.
The acoustic emission detection method of tank bottom in the restricted clearance may further comprise the steps:
The disconnected lead of said lead for retractable pencil is that lead for retractable pencil is become 25 ° to 35 ° the angle lead for retractable pencil that fractures with the storage tank shell surface, break lead five times of every bit, and its response amplitude value is got more than three times and is responded mean value.
In the step 1, the calibration of acoustic emission main frame is that whether each passage of inspection is normal before detection; The calibration of anti-explosion cable device channel sensitivity is before detecting beginning and after finishing; Each anti-explosion cable device passage is carried out the calibration of dummy source acoustic emission range value; Dummy source is in calibrate AE sensor 100mm, and the range value of each anti-explosion cable device channel response and the averaged amplitude value of all passages differ and require to be not more than 4dB.
In the step 1; Attenuation measurement is the high straight line of drawing from a certain calibrate AE sensor position along tank skin etc., on this line, carries out storage tank attenuation characteristic mensuration apart from sensor 0.5m, 1.0m, 2.0m, 3.0m, 4.0m, 6.0m, 9.0m, 12.0m, the disconnected lead in 15.0m place respectively.
In the step 1; Location calibration is by any position of calibrate AE sensor surveyed area array; The signal that the acoustic emission dummy source produces can be located array by this time difference at least and received, and obtains unique positioning result, can be received by this area sensor at least during zone location.
Adopted such scheme; The present invention adopts the acoustic emission online measuring technique to storage tank, through by a small amount of fixed sensor of certain arranged in arrays, receives the signal of tank skin " sound source "; Carry out data acquisition and Treatment Analysis through system host; Just can obtain the action message of sound source in testing process in the checked object, whether have leakage with a corrosion situation of judging storage tank and a jar end, thereby assessment is made in the overall integrity and the security of tank bottom.The present invention carries out Non-Destructive Testing to storage tank, have safe, the advantage of good economy performance.In addition, before detection, adopt the disconnected plumbous mode of lead for retractable pencil, carry out the calibration of acoustic emission main frame, the calibration of anti-explosion cable device channel sensitivity, attenuation measurement and location calibration, guaranteed the testing result reliability.
Description of drawings
Fig. 1 is the structural representation of the acoustic emission detection system of tank bottom in the restricted clearance of the present invention;
Fig. 2 is the structural representation of anti-explosion cable;
Fig. 3 is the structural representation of reel;
Fig. 4 is the side view of Fig. 3;
In the accompanying drawing, 1 is storage tank, and 2 is a jar chamber, and 3 is the anti-explosion cable device, and 3a is the second flame proof box, and 3b is the first flame proof box; 3c is a cable, and 3d is portable line, and 3e is a signal wire, and 4 is reel, and 4a is a hand-held rod; 4b is a support, and 4c is a rolling wheel, and 4e is a flame proof box basket, and 4f is a crank, and 4g is the cable exit; 4i is a press strip, and 4j is a plastic sheath, and 5 is emission sensor, and 6 are the acoustic emission main frame, and 7 is computing machine.
Embodiment
Referring to figs. 1 through Fig. 4, the acoustic emission detection system of tank bottom in the restricted clearance of the present invention, as can be seen from Figure 1, storage tank 1 is installed in jar chamber 2, and installation storage tank 1 back last space is narrow and small in jar chamber.Among the present invention, the acoustic emission detection system of tank bottom comprises: a plurality of emission sensor 5, anti-explosion cable device 3, acoustic emission main frame 6, computing machine 7 and lead for retractable pencil are elaborated in the face of each several part down:
A plurality of calibrate AE sensors 5 are evenly arranged on the same horizontal circumference of tank wall 1, and each sensor is responsible for detecting a zone on the storage tank, and these calibrate AE sensors convert the mechanical vibration of storage tank into electric signal; Said calibrate AE sensor is fixed on the storage tank wall through the magnetic deck.
Each calibrate AE sensor 5 all connects an anti-explosion cable device 3, and the anti-explosion cable device transmits the electric signal of calibrate AE sensor output.Said anti-explosion cable device comprises anti-explosion cable, and the explosion-proof form of anti-explosion cable is that flameproof and intrinsically safe is composite structured.This anti-explosion cable is made up of the first flame proof box 3b, the second flame proof box 3a cable, and the first flame proof box is identical with the second flame proof box structure, and all is made up of with lid the housing of cast aluminium material.Wherein be provided with the prime amplifier (not shown) in the first flame proof box 3b; The output terminal stube cable line 3c of prime amplifier; Be provided with safety barrier circuit (not shown) in the second flame proof box body, the input end of safety barrier circuit connects signal wire 3e, and the other end of signal wire 3e is used to connect calibrate AE sensor 5; What signal wire 3e adopted is the high temperature shielding line of M5 joint, and its length is 50～70cm.Safety barrier circuit and prime amplifier are electrically connected.For ease of extracting and operation, between the first flame proof box 3b and the second flame proof box 3a, be provided with portable line 3d, Bolt Connection is adopted at the two ends of portable line 3d, and it is firm to guarantee, and adopts bright-coloured color to differentiate mutually with the tie cable line.The anti-explosion cable device also comprises a reel 4, and when cable 3c was 80～100m, reel 4 diameters were preferably 25～27cm; When cable 3c was 100～120m, reel 4 diameters were preferably 27～30cm.Reel 4 is made up of hand-held rod 4a, support 4b, rolling wheel 4c and flame proof box basket 4e.The end of hand-held rod 4a and being connected of support 4b, hand-held rod 4a length 15-25 cm which is provided with the convenient extraction of hand shape profile.Rolling wheel 4c is supported on the support 4b rotationally, and the axial end of rolling wheel 4c is provided with crank 4f, cable exit 4g and press strip 4i.The bnc interface end of cable exit 4g place outgoing cable line, length is preferably 80～100cm.Two press strip 4i are fixed on the end face, are used for the cable of drawing is fixed, and two ends put plastic sheath 4j, prevent that cable from being damaged by press strip.Flame proof box basket 4e is welded on the support 4b, is rectangular box, is used to hold two flame proof boxes.
Each anti-explosion cable device is electrically connected to an acoustic emission main frame 6 jointly, and the elastic wave of these acoustic emission main frame 6 emissions is propagated the surface that arrives storage tank through the anti-explosion cable device, causes the mechanical vibration that supply calibrate AE sensor to survey storage tank bottom.Acoustic emission main frame 6 extends to work beyond the explosion hazard area through anti-explosion cable device 3, before acoustic emission detection begins, should carry out following preparation:
1) adopt double active/standby devices mode to check storage tank lightlng hole, jar chamber and gateway thereof, jar bottom, trench drain, chamber, manhole, oil inlet pipe and blow-off pipe and gate valve well place gas concentration, with affirmation Environmental security state, and the state that exceeds standard of reporting to the police.Boosting, in the pressurize testing process,, should adopt double active/standby devices mode to monitor the gas concentration at valve place because of personnel must carry out the controlled valve operation in jar chamber 2.In case transfinite, personnel withdraw to jar outdoor immediately, and the mode of taking to ventilate, stop operation reduces a jar indoor gas concentration.When summer, autumn, outdoor air forms convection current easily than jar room air heat, jar indoor easy formation condensate water, and be prone to be back to a jar chamber through lightlng hole at the oil gas that boosts, flow out from vacuum pressure valve in the step-down process, cause a jar chamber gas concentration to increase.Therefore when detecting, should reduce a lightlng hole and jar aperture of chamber door, reduce condensate water and backflow oil gas.
2), personal security operation: personnel should go into a jar safety work requirement dressing according to oil depot, not chemical fibre clothes and nail footwear, forbid to carry non-explosion-proof electronic products such as mobile phone, camera.Before each entering jar chamber 2 operations, should hold human body at jar chamber mouth and lead the static bar, eliminate the static electricity on human body.Personnel are arranged when the jar office operation, the lightlng hole place all should have the people to be responsible for and its contact, guarantees can in time take measures when fortuitous event takes place.
3), hardware installing/dismounting safe operation: comprise that cable launches to install with sensor.Because personnel are no any direction feeling in limited jar of chamber 2, in the counterclockwise 2m of turnover oil pipe-4m scope, confirm first calibrate AE sensor position, then determining remaining sensing station according to tank diameter.Place a reel 4 at each transducer arrangements place.The sensor signal lines 3e at joint protective cover place that outwards winding holds flame proof box handle 3d the flame proof box is proposed to put to calibrate AE sensor 5 layout places, rotates reel 4 cable is launched to be disposed to acoustic emission main frame place.In placement process, do not pull by force and hale cable, the extruding of avoiding colliding with.Then begin the installation site of planarizing sensor; We find to detect contrast through test of many times; Only need the tank skin surface sand flat it then with sand paper and clean, need not the tank skin surface coating be removed, can avoid the harmful effect that brings to tank skin after the coating like this.Before sensor and sensor signal lines 3e link or break off, all must never allow hot line job earlier with 10 shutdown of acoustic emission main frame.
4), electrostatic dissipation protection: the acoustic emission main frame must be connected to the electrostatic dissipation protection and can work.Electrostatic grounding can be utilized the own static electricity earthing device of adjacent storage tank or provide ground stud for oneself.When utilizing adjacent storage tank to have static electricity earthing device by oneself, should open the electrostatic grounding box earlier, the electrostatic grounding bolt disconnection with adjacent storage tank links with the acoustic emission main frame again.The measurement of Grounding Resistance value, when being not more than 10 Ω, the acoustic emission main frame just can be worked.After the outage of acoustic emission main frame, can break off main frame electrostatic grounding end, and the electrostatic grounding box is recovered to connect.
5), system component protection and auxiliary configuration thereof: calibrate AE sensor 5 and magnetic deck all need deposit with instrument cases in, instrument cases adopt the ballistic resistant material manufacturing.Shockproof sponge in the box needs lattice to become the space of sensor size, is convenient to sensor and puts into wherein, reaches not only can fix but also shockproof effect.For avoiding cable to receive sharp object and machinery scrapes damage, need around the corner, sharp object is other etc. located to wrap up cable with protective sleeve.
The acoustic emission detection method of tank bottom in the restricted clearance may further comprise the steps:
Testing result can adopt the time difference positioning analysis and the stage division of acoustic emission source; Also can adopt the zone location analysis and the stage division of acoustic emission source; As two kinds of stage divisions are adopted in the detection of same storage tank simultaneously, then same evaluation region should be got bigger rank.
1, the time difference positioning analysis and the classification of tank bottom acoustic emission source
Tank bottom delimited out square or circular evaluation zone with the length of diameter 10% not, carry out local the amplification and analyze and calculate the locating events that per hour occurs and count E evaluating all location groups that relatively concentrate position decided at the higher level but not officially announced, zone.Carry out classification according to following table:
| Source class is other | The locating events that per hour occurs in the evaluation zone is counted E | The etch state evaluation in evaluation zone |
| I | E ﹤ C | No local corrosion sign |
| II | C ﹤ E ﹤ 10C | There is slight local corrosion sign |
| III | 10C ﹤ E ﹤ 100C | There is obvious local corrosion sign |
| IV | 100C ﹤ E ﹤ 1000C | There is serious local corrosion sign |
| V | E ﹥ 1000C | There is serious local corrosion sign |
The C value needs through adopting identical detecting instrument and running parameter is set, and the storage tank of same size and service condition is carried out the test experience of some and opens a jar confirmatory experiment and obtain.
2, the zone location analysis and the classification of tank bottom acoustic emission source
Calculate the bump that each autonomous channel per hour occurs effective detection time and count H.According to following table acoustic emission source is carried out classification.
| Source class is other | The bump that each passage per hour occurs is counted H | The etch state evaluation in evaluation zone |
| Ⅰ | H﹤K | No local corrosion sign |
| Ⅱ | K﹤H﹤10K | There is slight local corrosion sign |
| Ⅲ | 10K﹤H﹤100K | There is obvious local corrosion sign |
| Ⅳ | 100K﹤H﹤1000K | There is serious local corrosion sign |
| Ⅴ | H﹥1000K | There is serious local corrosion sign |
K value in the table needs through adopting identical detecting instrument and running parameter is set, and the storage tank of same size and service condition is carried out the test experience of some and opens a jar confirmatory experiment and obtain.
3, formulate seized storage tank maintenance schedule, the sequencing of maintenance schedule according to storage tank bottom plate etch state grade.
| Base plate etch state grade | Corrosion condition | Maintenance/processing suggestion |
| Ⅰ | Unusual pettiness | Need not keep in repair |
| Ⅱ | On a small quantity | Need not consider maintenance in the recent period |
| Ⅲ | Medium | Consider maintenance |
| Ⅳ | Dynamically | Pay the utmost attention to maintenance |
| Ⅴ | Dynamically high | Override is considered maintenance |
With a 2000m
3Oil tank be example, the testing staff gets into and eliminates static before the operation area, job step such as Fig. 1～shown in Figure 2:
1), the testing staff should go into a jar safety work requirement dressing according to oil depot, not chemical fibre clothes and nail footwear.Respectively hold a gas concentration detector by two people, it is 560ppm that alarm threshold is set, and walks to the gas concentration of jar top, a chamber inspection lightlng hole, jar gateway, chamber, if overload alarm should take draft type to reduce gas concentration.
2), if no abnormal; Before entering jar chamber, should hold human body at jar chamber mouth and lead the static bar, eliminate the static electricity on human body; Then get into a jar chamber; Adopt double active/standby devices mode at the uniform velocity to move ahead counterclockwise along tank skin, the gas concentration of inspection trench drain, manhole, oil inlet pipe and blow-off pipe, gate valve Jing Chu determines whether to detect operation.
3), from storage tank nameplate or strong jar of data, learn that tank diameter is 19.2m, GB/T 18182 relevant regulations are confirmed 6 calibrate AE sensors are installed, and calculating the storage tank girth is 60.288m.
4), in the counterclockwise 2m of the oily short tube of turnover-4m scope; Select the installation site of 1# calibrate AE sensor; Open the tool box, go out 1# in the tank base marked with pencil, and will be apart from smooth zone and the wiped clean that goes out sensor size of the high tank skin of tank bottom 0.15m with sand paper.
5), pull out tape measure and advance counterclockwise along tank skin, respectively at 10.05m apart from the 1# position, 20.09m, 30.14m, 40.20m, the 50.24m place marks 2#～6# and smooth.
6), place an anti-explosion cable device respectively in 1#～6# position.The outward winding sensor signal lines at joint protective cover place, carrying stops carries line the flame proof box is proposed to put to the transducer arrangements point, rotates reel cable is disposed to acoustic emission main frame place.Should note being sure not to pull when cable is arranged, avoid stressed and artificial damage.For guaranteeing cable not by personnel activity, sharp object and mechanical damage, need around the corner, sharp object is other properly protects with protective sleeve.
7), open the tool box, vaseline is evenly spread upon on the receiving plane of sensor, be connected to signal wire interface on the M5 joint of sensor, guarantee to screw, utilize the magnetic deck that calibrate AE sensor is fixed on the tank skin.For making things convenient for the experimental check Instrument working state whether intact, note sensor number and cable numbering.
8), the electrostatic grounding box that connects adjacent oil depot storage tank to desire opens, and the electrostatic grounding of adjacent storage tank is broken off, the measurement of electrostatic stake resistance when being not more than 10 Ω, connects electrostatic grounding with the acoustic emission main frame, be that the acoustic emission main frame is supplied power.
9), from 1# position wherein along high straight lines of drawing such as tank skins, the lead for retractable pencil of the 0.3mm2H (or 0.5mmHB) that on this line, fractures apart from calibrate AE sensor 0.5m, 1.0m, 2.0m, 3.0m, 4.0m, 6.0m, 9.0m, 12.0m, 15.0m place respectively carries out storage tank attenuation characteristic mensuration; Disconnected plumbous method is that lead for retractable pencil becomes about 30 ° angle with the storage tank tank surface, and disconnected plumbous three times of every bit writes down three times amplitude and calculating mean value.
10), carry out school, calibrate AE sensor location and close: counterclockwise from the 1# position to the 6# position, at disconnected lead three times, in computing machine, calculate the velocity of sound apart from calibrate AE sensor 1cm place.
11) utilize the elastic wave of acoustic emission main frame emission to propagate the surface that arrives storage tank, cause the mechanical vibration that supply calibrate AE sensor to survey storage tank bottom through the anti-explosion cable device.Computing machine receives the signal of each calibrate AE sensor that comes from the acoustic emission host process, judges that each calibrate AE sensor detects the situation of the tank bottom in this zone.
12), personnel carry out sensor install, disconnected when plumbous, the lightlng hole place all should have the people to be responsible for and its contact, guarantees that fortuitous event takes place in time to take measures.
13), storage tank is loaded, each is boosted and packing stage carries out acoustic emission monitor(ing) and data acquisition according to the loading scheme of formulating in advance, the timing node of noting each stage with during the phenomenon found.Boost, in the pressure maintaining period, personnel must carry out the controlled valve operation in the jar chamber, adopt double active/standby devices mode to monitor the gas concentration at valve place.In case transfinite, personnel withdraw to jar outdoor immediately, and the mode of taking to ventilate, stop operation reduces a jar indoor gas concentration.
14), after the acoustic emission main frame outage, can break off main frame electrostatic grounding end, and the electrostatic grounding box is recovered to connect.Before personnel get into jar chamber, must eliminate the static electricity on human body once more, after an affirmation jar indoor gas concentration does not transfinite, can get into and remove receipts.
Claims (10)
1. the acoustic emission detection system of tank bottom in the restricted clearance; It is characterized in that; Comprise: be evenly arranged in a plurality of calibrate AE sensors on the same circumference of tank wall; Each sensor is responsible for detecting a zone on the storage tank, and these calibrate AE sensors convert the mechanical vibration of storage tank into electric signal; And
Each calibrate AE sensor all connects an anti-explosion cable device, and the anti-explosion cable device transmits the electric signal of calibrate AE sensor output; And
With the acoustic emission main frame that each anti-explosion cable device is electrically connected, the elastic wave of this acoustic emission main frame emission is propagated the surface that arrives storage tank through the anti-explosion cable device, causes the mechanical vibration that supply calibrate AE sensor to survey storage tank bottom; And
The computing machine that is electrically connected with the acoustic emission main frame, reception comes from the signal of each calibrate AE sensor of acoustic emission host process, judges that each calibrate AE sensor detects the situation of the tank bottom in this zone; And
Lead for retractable pencil fractures on storage tank, sends the signal that fractures as the dummy source that can repeat to send elastic wave, carries out the calibration of acoustic emission main frame, the calibration of anti-explosion cable device channel sensitivity, attenuation measurement and location calibration.
2. the acoustic emission detection system of tank bottom in the restricted clearance according to claim 1; It is characterized in that said anti-explosion cable device comprises anti-explosion cable, this anti-explosion cable is made up of the first flame proof box, the second flame proof box, cable; Wherein be provided with the safety barrier circuit in the first flame proof box body; Be provided with prime amplifier in the second flame proof box, safety barrier circuit and prime amplifier are electrically connected, the output terminal stube cable line of prime amplifier.
3. the acoustic emission detection system of tank bottom is characterized in that in the restricted clearance according to claim 2, is provided with portable line between the first flame proof box and the second flame proof box.
4. the acoustic emission detection system of tank bottom in the restricted clearance according to claim 2; It is characterized in that; Said anti-explosion cable device also comprises a reel, and this reel is made up of hand-held rod, support, rolling wheel and flame proof box basket, an end of hand-held rod and being connected of support; Rolling wheel is supported on the support rotationally, and the axial end of rolling wheel has been provided with crank, cable exit and press strip.
5. the acoustic emission detection system of tank bottom is characterized in that in the restricted clearance according to claim 1, and said calibrate AE sensor is fixed on the storage tank wall through the magnetic deck.
6. the acoustic emission detection method of tank bottom in the restricted clearance is characterized in that, may further comprise the steps:
Step 1; Lead for retractable pencil is disconnected plumbous; The signal that sends when lead for retractable pencil fractures is as the dummy source that can repeat to send elastic wave; Detect this dummy source signal and transfer to the acoustic emission main frame through calibrate AE sensor, to carry out the calibration of acoustic emission main frame, the calibration of anti-explosion cable device channel sensitivity, attenuation measurement and location calibration;
Step 2; Emission main frame emission elastic wave is propagated the surface that arrives storage tank through the anti-explosion cable device; Cause the mechanical vibration that supply calibrate AE sensor to survey storage tank bottom; After the mechanical vibration from the bottom of the storage tank that each calibrate AE sensor will receive convert electric signal into; Through being back to the acoustic emission main frame after the anti-explosion cable device processing and amplifying, be sent to computing machine behind the signal of each calibrate AE sensor that the acoustic emission main frame will be handled, detect the corrosion situation of the tank bottom in this zone by each calibrate AE sensor of computer judges.
7. according to the acoustic emission detection method of tank bottom in the said restricted clearance of claim 6; It is characterized in that; The disconnected lead of said lead for retractable pencil is that lead for retractable pencil is become 25 ° to 35 ° the angle lead for retractable pencil that fractures with the storage tank shell surface, break lead five times of every bit, and its response amplitude value is got more than three times and is responded mean value.
8. according to the acoustic emission detection method of tank bottom in the said restricted clearance of claim 6, it is characterized in that in the step 1, the calibration of acoustic emission main frame is that whether each passage of inspection is normal before detection; The calibration of anti-explosion cable device channel sensitivity is before detecting beginning and after finishing; Each anti-explosion cable device passage is carried out the calibration of dummy source acoustic emission range value; Dummy source is in calibrate AE sensor 100mm, and the range value of each anti-explosion cable device channel response and the averaged amplitude value of all passages differ and require to be not more than 4dB.
9. according to the acoustic emission detection method of tank bottom in the said restricted clearance of claim 6; It is characterized in that; In the step 1; Attenuation measurement is the high straight line of drawing from a certain calibrate AE sensor position along tank skin etc., on this line, carries out storage tank attenuation characteristic mensuration apart from sensor 0.5m, 1.0m, 2.0m, 3.0m, 4.0m, 6.0m, 9.0m, 12.0m, the disconnected lead in 15.0m place respectively.
10. according to the acoustic emission detection method of tank bottom in the said restricted clearance of claim 6; It is characterized in that; In the step 1, location calibration is by any position of calibrate AE sensor surveyed area array, and the signal that the acoustic emission dummy source produces can be received by this time difference location array at least; And obtain unique positioning result, can be received by this area sensor at least during zone location.
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| CN104897780A (en) * | 2015-05-25 | 2015-09-09 | 北京理工大学 | Method for positioning acoustic emission source by using acoustic emission signal energy |
| CN105092710A (en) * | 2014-05-14 | 2015-11-25 | 中国石油天然气股份有限公司 | On-line quantitative detection device and method for storage tank base plate corrosion |
| CN105203640A (en) * | 2015-09-18 | 2015-12-30 | 天津大学 | Embedded type acoustic emission sensing system |
| CN105319028A (en) * | 2014-07-24 | 2016-02-10 | 江苏神通阀门股份有限公司 | Valve leakage fault on-line diagnostic system |
| CN105842344A (en) * | 2016-03-28 | 2016-08-10 | 深圳市科兰德实业发展有限公司 | Bridge monitoring apparatus and bridge monitoring method |
| CN106199522A (en) * | 2016-08-30 | 2016-12-07 | 北京声华兴业科技有限公司 | The acoustic emission source locating method of a kind of cylinder storage tank and device thereof |
| CN106706760A (en) * | 2016-12-20 | 2017-05-24 | 北京工业大学 | Acoustic emission source positioning method of composite material plate of omnidirectional dual circular array |
| CN106770679A (en) * | 2017-01-25 | 2017-05-31 | 上海市特种设备监督检验技术研究院 | Fibre reinforced plastics pressure vessel detection method based on acoustic emission testing technology |
| CN106855494A (en) * | 2015-12-08 | 2017-06-16 | 中国石油化工股份有限公司 | A kind of storage tank bottom plate acoustic emission detection system |
| CN107238662A (en) * | 2017-08-11 | 2017-10-10 | 广东石油化工学院 | A kind of experimental provision and detection method for storage tank acoustic emission detection |
| CN109187741A (en) * | 2018-08-15 | 2019-01-11 | 重庆大学 | Large-scale storage tank bottom plate weld seam health status on-line monitoring method |
| CN109307707A (en) * | 2017-11-16 | 2019-02-05 | 中国石油化工股份有限公司 | The passive sound fusion detection method of storage tank bottom plate distributed wireless master |
| CN110044702A (en) * | 2019-05-05 | 2019-07-23 | 中国人民解放军陆军装甲兵学院 | Vacuum sound emission nondestructive detection system |
| CN110082194A (en) * | 2019-05-05 | 2019-08-02 | 中国人民解放军陆军装甲兵学院 | Coating material original position stretching observation method |
| CN110824018A (en) * | 2019-11-12 | 2020-02-21 | 宁波市劳动安全技术服务公司 | Risk assessment and safety detection evaluation method for atmospheric storage tank |
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| CN105092710A (en) * | 2014-05-14 | 2015-11-25 | 中国石油天然气股份有限公司 | On-line quantitative detection device and method for storage tank base plate corrosion |
| CN105319028A (en) * | 2014-07-24 | 2016-02-10 | 江苏神通阀门股份有限公司 | Valve leakage fault on-line diagnostic system |
| CN105319028B (en) * | 2014-07-24 | 2018-07-20 | 江苏神通阀门股份有限公司 | A kind of valve leak on-line fault diagnosis system |
| CN104833628B (en) * | 2015-04-29 | 2018-10-16 | 中国石油天然气股份有限公司 | A kind of tank floor inspection simulator and simulation storage tank |
| CN104833628A (en) * | 2015-04-29 | 2015-08-12 | 中国石油天然气股份有限公司 | Storage tank base plate detection analog device and analog storage tank |
| CN104897780A (en) * | 2015-05-25 | 2015-09-09 | 北京理工大学 | Method for positioning acoustic emission source by using acoustic emission signal energy |
| CN104897780B (en) * | 2015-05-25 | 2018-04-03 | 北京理工大学 | A kind of method positioned using Acoustic Emission Signal Energy to acoustic emission source |
| CN105203640A (en) * | 2015-09-18 | 2015-12-30 | 天津大学 | Embedded type acoustic emission sensing system |
| CN106855494A (en) * | 2015-12-08 | 2017-06-16 | 中国石油化工股份有限公司 | A kind of storage tank bottom plate acoustic emission detection system |
| CN105842344A (en) * | 2016-03-28 | 2016-08-10 | 深圳市科兰德实业发展有限公司 | Bridge monitoring apparatus and bridge monitoring method |
| CN106199522A (en) * | 2016-08-30 | 2016-12-07 | 北京声华兴业科技有限公司 | The acoustic emission source locating method of a kind of cylinder storage tank and device thereof |
| CN106706760A (en) * | 2016-12-20 | 2017-05-24 | 北京工业大学 | Acoustic emission source positioning method of composite material plate of omnidirectional dual circular array |
| CN106770679A (en) * | 2017-01-25 | 2017-05-31 | 上海市特种设备监督检验技术研究院 | Fibre reinforced plastics pressure vessel detection method based on acoustic emission testing technology |
| CN107238662A (en) * | 2017-08-11 | 2017-10-10 | 广东石油化工学院 | A kind of experimental provision and detection method for storage tank acoustic emission detection |
| CN109307707A (en) * | 2017-11-16 | 2019-02-05 | 中国石油化工股份有限公司 | The passive sound fusion detection method of storage tank bottom plate distributed wireless master |
| CN109187741A (en) * | 2018-08-15 | 2019-01-11 | 重庆大学 | Large-scale storage tank bottom plate weld seam health status on-line monitoring method |
| CN110044702A (en) * | 2019-05-05 | 2019-07-23 | 中国人民解放军陆军装甲兵学院 | Vacuum sound emission nondestructive detection system |
| CN110082194A (en) * | 2019-05-05 | 2019-08-02 | 中国人民解放军陆军装甲兵学院 | Coating material original position stretching observation method |
| CN110824018A (en) * | 2019-11-12 | 2020-02-21 | 宁波市劳动安全技术服务公司 | Risk assessment and safety detection evaluation method for atmospheric storage tank |
| CN110824018B (en) * | 2019-11-12 | 2022-05-27 | 宁波市劳动安全技术服务公司 | Risk assessment and safety detection evaluation method for atmospheric storage tank |
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