CN112798687B - Ultrasonic transmission in-situ detection method for creep crack on inner wall of hydrogen production furnace tube - Google Patents
Ultrasonic transmission in-situ detection method for creep crack on inner wall of hydrogen production furnace tube Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 107
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 38
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 34
- 239000001257 hydrogen Substances 0.000 title claims abstract description 34
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 34
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 13
- 230000005540 biological transmission Effects 0.000 title claims abstract description 11
- 230000007547 defect Effects 0.000 claims abstract description 9
- 238000009792 diffusion process Methods 0.000 claims abstract 2
- 230000005284 excitation Effects 0.000 claims description 21
- 230000009194 climbing Effects 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 8
- 239000000523 sample Substances 0.000 claims description 8
- 238000004364 calculation method Methods 0.000 claims description 7
- 238000012545 processing Methods 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 238000003384 imaging method Methods 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 238000004132 cross linking Methods 0.000 claims description 3
- 238000002592 echocardiography Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 239000007822 coupling agent Substances 0.000 claims description 2
- 238000007654 immersion Methods 0.000 claims 2
- 230000008901 benefit Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000009659 non-destructive testing Methods 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 101001055216 Homo sapiens Interleukin-9 Proteins 0.000 description 1
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 1
- 102100026871 Interleukin-9 Human genes 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000009750 centrifugal casting Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/07—Analysing solids by measuring propagation velocity or propagation time of acoustic waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/26—Arrangements for orientation or scanning by relative movement of the head and the sensor
- G01N29/265—Arrangements for orientation or scanning by relative movement of the head and the sensor by moving the sensor relative to a stationary material
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/10—Number of transducers
- G01N2291/104—Number of transducers two or more emitters, one receiver
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/10—Number of transducers
- G01N2291/105—Number of transducers two or more emitters, two or more receivers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
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Abstract
The invention discloses an ultrasonic transmission in-situ detection method for creep cracks on the inner wall of a hydrogen production furnace tube, which comprises the steps that two piezoelectric transducers are arranged into a group in a one-excitation-one-receiving mode according to a specific angle, three groups are circumferentially arranged and fixed at a certain position away from the outer wall of the hydrogen production furnace tube, and the full coverage of the inner wall of a pipeline in a detection area of the hydrogen production furnace tube is realized by utilizing sound beams in a diffusion angle of the piezoelectric transducers and rotation of a detection ring; the electronic scanning mode is adopted to excite the transmitting piezoelectric transducers in each group of detection structures simultaneously, so that ultrasonic waves are radiated into the couplant and enter the inner wall of the pipeline at a certain angle, echo signals are radiated out of the pipeline at a certain angle after passing through the detection area, the entering couplant is received by the receiving transducers, and creep cracks of the pipeline are quantified through recognition of characteristics of the echo signals. According to the invention, the hydrogen production furnace tube is detected in a three-group one-excitation one-receiving detection ring rotation mode, so that the in-situ detection of the surface defects of the fan spindle in a non-manual scanning mode is realized.
Description
Technical Field
The invention relates to an ultrasonic transmission in-situ detection method for creep cracks on the inner wall of a hydrogen production furnace tube, and belongs to the field of nondestructive detection.
Background
Hydrogen energy is becoming more and more interesting as a clean renewable energy source. With the large-scale application of the hydrogen production furnace in petrochemical oil refining enterprises, the running states of the hydrogen production furnace tube and parts thereof are directly related to the safety and benefits of national enterprises. The hydrogen production furnace is internally provided with a plurality of pipelines which are arranged side by side for whole furnace operation, the furnace tube is a main pressure-bearing member, and the situation of crack generation caused by long-time high-temperature and high-pressure environment and hydrogen oxide corrosion is unavoidable. Therefore, the safety detection of the structure is not only helpful for preventing the occurrence of safety accidents, but also can replace the problem pipeline in time to avoid unnecessary economic loss.
The hydrogen production furnace tube is in a production state of being fixed between two heating furnaces in a whole row and being at high temperature and high pressure throughout the year, the whole furnace is required to be stopped for 1-2 days for each detection, so that the enterprise benefit is greatly influenced, the starting and stopping of the heating furnaces seriously influence the growth of pipeline cracks, how to comprehensively detect pipelines in the furnace in a short time is a main problem facing the prior art, a detector can only climb up a scaffold in a furnace stopping state, and the fire facing surface and the backfire surface of the furnace tube are detected in a stepping manner by using a longitudinal wave probe or scanned by adopting a pipe climbing machine in a manner of dividing the pipeline into two times. So the in-situ detection of the HP40 pipeline furnace tube, especially the centrifugal casting, cannot be well implemented to date, and in order to ensure the safe use of the hydrogen production furnace, ensure the national production safety, minimize the potential safety hazard and greatly necessitate and urge the research to be close to a defect detection method with wide manual detection coverage range.
The hydrogen production furnace tube is mainly formed by centrifugally casting metal elements such as nickel, chromium and the like, has larger grain size and larger attenuation on the transmission of various energies compared with common tubes in the market, and the workpieces are designed into thick-wall pipelines for ensuring that the workpieces can be in a working state all the year round. To detect this, the ultrasonic transmission method is certainly the most suitable and effective detection method. The ultrasonic nondestructive testing technology has comprehensive advantages for determining parameters such as the size, the position, the orientation, the burial depth, the property and the like of the internal defect compared with other nondestructive testing methods, and is mainly characterized in that: strong penetrating power, high signal integrity and no harm to human body, parts and surrounding environment.
The research on the detection of petrochemical facilities is relatively more at home and abroad, but the research on hydrogen production furnace tubes is less, failure analysis is generally carried out after a failed pipeline is detached, a pipeline climbing robot is used for scanning a fire surface and a backfire surface of the pipeline under the condition of not moving the pipeline, and the detection method is nearly mature. Although the method is reasonable and feasible in design, the method cannot be directly and widely applied to in-situ detection of the hydrogen production furnace tube, and the main reason is as follows: although creep cracks are mostly generated on the reverse/backfire surface due to the influence of temperature difference, the actual failure analysis result shows that the cracks are still more likely to be generated at the reverse/backfire junction to cause creep failure, and the method is just the loophole of the current detection method. And the length of a single furnace tube is about 12m, so that the traditional detection method has low efficiency and low wide applicability.
Disclosure of Invention
The invention provides a furnace tube creep circumferential detection method based on ultrasonic transmission longitudinal waves, which adopts a longitudinal wave piezoelectric transducer, can realize the detection of the creep crack on the inner wall of a furnace tube through electronic scanning, avoids the complicated process of manual scanning in the conventional detection process, and is more beneficial to realizing the circumferential detection of the creep crack on the inner wall of the furnace tube compared with other in-situ detection methods of the furnace tube.
In order to achieve the purpose, the technical scheme adopted by the invention is that the ultrasonic transmission in-situ detection method for the creep crack of the inner wall of the hydrogen production furnace tube is adopted, and a detection device for realizing the detection method comprises a computer 1, ultrasonic excitation receiving equipment 2, a miniature water supply pump 3, a rotating motor 4, a detection ring 5, an excitation receiving transducer 6 and a furnace tube 7. The method specifically comprises the following steps of:
step one, determining the diameter D and the wall thickness T of a furnace tube to be detected, and determining the distance T between the acoustic path in the tube and the inner wall of the tube according to the material of the hydrogen production furnace tube and the size Q of a defect to be detected, wherein the refraction angle in the tube passes Calculation of the Acoustic wave Angle of incidence pass/>, according to the snell's lawCalculating, wherein: c L1 is the wave velocity of the coupling agent, and C L2 is the longitudinal wave velocity of the material of the hydrogen production furnace tube;
Step two, selecting a piezoelectric transducer with moderate center frequency F, diameter d and focusing distance F according to an ultrasonic detection principle, adjusting the clamping angle of a transducer of a sensing ring according to the sound wave incidence angle alpha obtained by calculation in the step one and the sound wave propagation path in a pipe, so that the transducer meets the incidence and receiving conditions obtained by calculation in the step one and is fixed, and setting the other two groups of detection structures to be the same;
step three, fixing three groups of transducers according to the method in the step two, wherein the zero point moment position is a detection group with the number of 1, and the detection groups are numbered 2 and 3 clockwise, leading-out wires of each piezoelectric transducer in the detection ring are respectively connected to corresponding channel interfaces of ultrasonic excitation receiving equipment, and the position setting and electrical crosslinking of the piezoelectric transducers are completed;
Step four, the water pump is started to regulate the flow, ultrasonic excitation receiving equipment is started after the coupling condition is judged to be reached, the wireless communication state of the computer and the equipment is detected, the ultrasonic excitation receiving equipment is controlled by the computer to transmit a detection instruction, three channels of piezoelectric transducers are excited simultaneously, three groups of echoes are collected to confirm whether waveforms are normal or not, and if the waveforms have problems, the positions of the transducers are finely adjusted in the step one and the step two;
Step five, after the operation of the sensing ring is correct, a command is sent again to test the operation state of the pipe climbing motor and the rotating motor, after each link of the system is confirmed, the pipe climbing machine is regulated to the bottom end of the pipeline to be tested, and a computer sends the command to start automatic detection of the whole pipe;
Step six, scanning the machine from bottom to top, continuously sending detection data to a computer through a wireless module for imaging and processing, stopping running a pipe climbing motor at the top end of a pipeline, driving a detection ring to rotate by a certain angle by a rotating motor, running the pipe climbing motor again, and running a detection system from top to bottom;
And step seven, running the machine to be climbed to the bottom end of the pipeline, and after the ultrasonic excitation receiving equipment finishes transmitting detection data, carrying out data arrangement on uplink echo signals and downlink echo signals of each numbered detection group on a computer to finish the detection of the hydrogen production furnace tube. The data arrangement mode sequentially arranges waveforms according to the scanning sequence of the system from bottom to top, so that three channels of downlink data of the system are required to be exchanged head to tail after the scanning is finished, and the uniform arrangement and processing of all-tube circumferential scanning data are realized.
And step eight, determining the corresponding position and the appearance height of the defect position, namely the group number, according to the piezoelectric transducer detection group number and the peak value reduction value of the problem echo.
Compared with the prior art, the invention has beneficial effects.
1. According to the method, the creep cracks on the inner wall of the hydrogen production furnace tube are detected in the circumferential direction by utilizing ultrasonic waves radiated by the three groups of piezoelectric transducers, the position of the detection ring is not required to be manually adjusted in the detection process, the in-situ detection of the inner wall Zhou Xiangquan of the furnace tube is realized, and the method has obvious advantages in the aspects of implementation convenience and detection efficiency.
2. According to the invention, an electronic scanning mode of a pipe climbing machine is utilized to replace a manual scanning mode, so that a detection person does not need to climb up a scaffold to perform manual stepping scanning detection operation on a problem area; aiming at the quality detection of the components, in particular to a long pipe and a large engineering requiring the whole pipe circumferential detection workload, the invention provides a new thought for solving the technical problem.
Drawings
FIG. 1 is a schematic diagram of an ultrasonic transmission in-situ detection system for creep cracks on the inner wall of a hydrogen production furnace tube used in the invention;
FIG. 2 is a schematic illustration of the structural dimensions of a furnace tube and a single set of transducer detection zones in an embodiment of the present invention;
FIG. 3 is a schematic illustration of the positional arrangement of three sets of piezoelectric transducers in a sense loop of the present invention;
FIG. 4 is a schematic diagram of a rotating electric drive detection ring of the present invention;
FIG. 5 is a schematic diagram of the positions and coverage areas of the uplink and downlink probes in an embodiment of the present invention;
Detailed Description
The invention is described in detail below with reference to the drawings and the detailed description.
For the hydrogen production furnace tube, whether safe production operation can be realized or not is close to or even exceeds the design service life, and the quality detection is very critical. Practice proves that the hydrogen production furnace tube is influenced by environment and corrosive gas in the long-term use process, the tube wall is easy to generate creep cracks growing from the inner wall to the outer wall, and the cracks directly influence the service life and production safety of the furnace tube.
The hydrogen production furnace tube adopted in the embodiment is the furnace tube 7 to be detected in FIG. 1, the furnace tube material is 45Ni35cr25nb, and the ultrasonic longitudinal wave sound velocity of the material is 5917m/s. The structural dimensions and detection area are shown in figure 2, and the detection surface is the area close to the inner wall of the tube.
The detection system adopted by the embodiment comprises a computer, an ultrasonic excitation receiving device, a miniature water pump and a pipe climbing machine comprising a detection ring, and the specific implementation steps are as follows:
Step one, in the embodiment, the material of the hydrogen production furnace tube 7 is 45Ni35cr25nb, the diameter D is 138mm, the wall thickness is 14.5mm, creep defects with Q less than or equal to 4mm are detected, the distance t between the sound wave path in the tube and the inner wall of the tube is 7.25mm, the sound wave refraction angle beta=63.49 degrees (63.5 degrees) and alpha=12.93 degrees (12.9 degrees) are obtained through calculation, wherein the wave speed of the couplant is 1480m/s and the longitudinal wave speed of the furnace tube is 5917m/s;
step two, selecting a piezoelectric transducer with a central frequency of 1MHz and a diameter phi of 20mm according to the general principle of ultrasonic detection by combining the attenuation capability of materials on sound waves, exciting a line focusing probe with a focusing distance F of 25mm for ensuring the concentration of sound beams, receiving a flat probe with the same parameters, determining the positions of two probes according to the incidence angle alpha and the propagation path of the sound waves in the pipe, combining the focusing distance of the probes, and manufacturing a special fixture for fixing, wherein the other two groups of detection structures are arranged in the same way, as shown in figure 3;
step three, after the probe is fixed, the position of the whole detection ring is regulated, a channel is regulated to be opposite to the fire surface of the single side of the furnace tube, the detection group is numbered 1, the other detection groups 2 and 3 are numbered clockwise, the outgoing line of each piezoelectric transducer in the detection ring is respectively connected to a channel interface corresponding to ultrasonic excitation receiving equipment, and the position setting and electrical crosslinking of the piezoelectric transducers are completed;
Step four, the water pump is started to regulate the flow, ultrasonic excitation receiving equipment is started after the coupling condition is judged to be reached, the wireless communication state of the computer and the equipment is detected, the ultrasonic excitation receiving equipment is controlled by the computer to transmit a detection instruction, three channels of piezoelectric transducers are excited simultaneously, three groups of echoes are collected to confirm whether waveforms are normal or not, and if the waveforms have problems, the positions of the transducers are finely adjusted in the step one and the step two;
Step five, after the sensor ring runs correctly, a command is sent again to test the ascending and descending distances of the pipe climbing motor, the rotating motor runs clockwise and anticlockwise by 60 degrees, after each link of the system is confirmed, the pipe climbing machine is regulated to the bottom end of a pipeline to be tested, and a computer sends the command to start automatic detection of the whole pipe;
Step six, scanning from bottom to top by a machine, continuously sending detection data to a computer through a wireless module for imaging and processing, stopping running a pipe climbing motor at the top end of a pipeline, driving a detection ring to rotate clockwise by 60 degrees by a rotating motor, and running the pipe climbing motor again as shown in fig. 4, wherein a detection system runs from top to bottom;
And step seven, running the machine to be climbed to the bottom end of the pipeline, and after the ultrasonic excitation receiving equipment finishes transmitting detection data, carrying out data arrangement on uplink echo signals and downlink echo signals of each numbered detection group on a computer to finish the detection of the hydrogen production furnace tube. The data arrangement mode sequentially arranges waveforms according to the scanning sequence of the system from bottom to top, so that downlink data of a system I, a system II and a system III are exchanged for the first time after the scanning is finished, the uniform arrangement and processing of all-pipe circumferential scanning data are realized, and the positions of uplink and downlink transducers of all channels and the whole detection process cover a pipeline area as shown in figure 5.
And step eight, determining the corresponding position and the appearance height of the defect position, namely the group number, according to the piezoelectric transducer detection group number and the peak value reduction value of the problem echo.
Claims (1)
1. An ultrasonic transmission in-situ detection method for creep cracks on the inner wall of a hydrogen production furnace tube is characterized by comprising the following steps of: two piezoelectric transducers are arranged into a group in a one-excitation-one-receiving mode according to a specific angle, three groups are circumferentially arranged and fixed at a position which is a certain distance from the outer wall of the hydrogen production furnace tube, and the full coverage of the inner wall of the pipeline in the hydrogen production furnace tube detection area is realized by utilizing the rotation of sound beams and detection rings in the diffusion angle of the piezoelectric transducers; exciting the transmitting piezoelectric transducers in each group of detection structures simultaneously in an electronic scanning mode to radiate ultrasonic waves into the couplant and enter the inner wall of the pipeline at a certain angle, and after the ultrasonic waves pass through the detection area, the echo signals radiate out of the pipeline at a certain angle and enter the couplant to be received by the receiving transducers, so that creep cracks of the pipeline are quantified through recognition of the characteristics of the echo signals;
The method comprises the following steps of firstly, determining the diameter D and the wall thickness T of a furnace tube to be detected, and determining the distance T between the path of sound waves in the tube and the inner wall of the tube according to the material of the hydrogen production furnace tube and the size Q of defects to be detected, wherein the refraction angle in the tube passes Calculation of the Acoustic wave Angle of incidence pass/>, according to the snell's lawCalculating, wherein: c L1 is the wave velocity of the coupling agent, and C L2 is the longitudinal wave velocity of the material of the hydrogen production furnace tube;
Step two, selecting a piezoelectric transducer with moderate center frequency F, diameter d and focusing distance F according to an ultrasonic detection principle, adjusting the clamping angle of a transducer of a sensing ring according to the sound wave incidence angle alpha obtained by calculation in the step one and the sound wave propagation path in a pipe, so that the transducer meets the incidence and receiving conditions obtained by calculation in the step one and is fixed, and setting the other two groups of detection structures to be the same;
Step three, fixing three groups of transducers according to the method in the step two, respectively connecting outgoing lines of each piezoelectric transducer in the detection ring to corresponding channel interfaces of ultrasonic excitation receiving equipment, and completing piezoelectric transducer position setting and electrical crosslinking;
Step four, the water pump is started to regulate the flow, ultrasonic excitation receiving equipment is started after the coupling condition is judged to be reached, the wireless communication state of the computer and the equipment is detected, the ultrasonic excitation receiving equipment is controlled by the computer to transmit a detection instruction, three channels of piezoelectric transducers are excited simultaneously, three groups of echoes are collected to confirm whether waveforms are normal or not, and if the waveforms have problems, the positions of the transducers are finely adjusted in the step one and the step two;
Step five, after the operation of the sensing ring is correct, a command is sent again to test the operation state of the pipe climbing motor and the rotating motor, after each link of the system is confirmed, the pipe climbing machine is regulated to the bottom end of the pipeline to be tested, and a computer sends the command to start automatic detection of the whole pipe;
Step six, scanning from bottom to top, continuously sending detection data to a computer through a wireless module for imaging and processing, stopping running a pipe climbing motor at the top end of a pipeline, driving a detection ring to rotate by a certain angle by a rotating motor, running the pipe climbing motor again, and running a detection system from top to bottom;
step seven, the machine to be climbed is operated to the bottom end of the pipeline, after the ultrasonic excitation receiving equipment finishes transmitting detection data, the ultrasonic excitation receiving equipment finishes detecting the hydrogen production furnace tube by carrying out data arrangement on uplink echo signals and downlink echo signals of each numbered detection group on a computer; the data arrangement mode sequentially arranges waveforms according to the scanning sequence of the system from bottom to top, so that three channels of downlink data of the system are required to be exchanged head to tail after the scanning is finished, and the uniform arrangement and processing of all-tube circumferential scanning data are realized;
step eight, determining the corresponding position and the appearance height of the defect position, namely the group number, according to the piezoelectric transducer detection group number and the peak value reduction value of the problem echo;
The system detection ring is provided with three groups of transducers, each group of water immersion line focusing excitation transducers and one water immersion leveling probe receiving transducer, and the number of the piezoelectric transducers is 6; the zero point time position is the detection group with the number 1 and the detection groups are numbered 2 and 3 clockwise;
The ultrasonic transmission in-situ detection process of creep cracks on the inner wall of the hydrogen production furnace tube comprises the following steps: the pipe climbing machine is connected with the detection ring and is driven by the motor to scan from bottom to top, detection data are continuously sent to the computer for imaging and processing through the wireless module, the pipe climbing motor at the top end of the pipeline stops running, the detection ring is driven by the rotating motor to rotate 60 degrees clockwise, the pipe climbing motor runs again, the detection system scans from top to bottom, the pipe bottom end is reached, and the data are distributed to the computer after being transmitted to finish the full circumferential scanning detection of the pipeline;
the detection device for realizing the detection method comprises a computer, ultrasonic excitation receiving equipment, a miniature water supply pump, a rotary motor, a detection ring, an excitation receiving transducer and a furnace tube; the computer is connected with the ultrasonic excitation receiving equipment through a wireless module, the ultrasonic excitation receiving equipment is connected with the rotating motor, the miniature water supply pump is connected with the detection ring, and the rotating motor is connected with the detection ring gear structure.
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| CN109709211A (en) * | 2017-10-26 | 2019-05-03 | 南京驰新科技有限责任公司 | The detection method of SECTION TUBE FOR HYDROGEN MANNU-FACTURING FURNACE boiler tube |
| CN108896663A (en) * | 2018-05-31 | 2018-11-27 | 北京理工大学 | Gas pipeline endosexine defect Air Coupling ultrasound non-contact detection system |
| CN110568066A (en) * | 2019-08-02 | 2019-12-13 | 江苏方建质量鉴定检测有限公司 | Phased array ultrasonic wave concrete reinforcement corrosion detection device |
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