CN220019470U - Pulse far-field eddy current detection probe for ultrahigh pressure tubular reactor - Google Patents
Pulse far-field eddy current detection probe for ultrahigh pressure tubular reactor Download PDFInfo
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- CN220019470U CN220019470U CN202321671977.7U CN202321671977U CN220019470U CN 220019470 U CN220019470 U CN 220019470U CN 202321671977 U CN202321671977 U CN 202321671977U CN 220019470 U CN220019470 U CN 220019470U
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- 229920003023 plastic Polymers 0.000 claims description 5
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- 238000007689 inspection Methods 0.000 claims 1
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- 238000005260 corrosion Methods 0.000 abstract description 9
- 238000005299 abrasion Methods 0.000 abstract description 5
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- 238000000034 method Methods 0.000 description 7
- 230000007547 defect Effects 0.000 description 3
- 230000005284 excitation Effects 0.000 description 3
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- 239000004831 Hot glue Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000009659 non-destructive testing Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000009193 crawling Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229920001684 low density polyethylene Polymers 0.000 description 1
- 239000004702 low-density polyethylene Substances 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
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- 238000004804 winding Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
The utility model discloses a pulse far-field eddy current detection probe for an ultrahigh-pressure tubular reactor, wherein one end of a probe shell is provided with a front end cover with a through hole in the center, the other end of the probe shell is provided with a rear end cover with a tubular joint in the center, the periphery of the probe shell is uniformly provided with three pairs of supports, and each support is connected with a driving wheel through a wheel arm; the magnetic core exciting coil and the receiving coil in the probe shell are connected through a connecting rod, the magnetic core exciting coil is connected with a signal exciting wire, the receiving coil is connected with a signal receiving wire, and the signal exciting wire and the signal receiving wire are both connected with a pulse far-field eddy current host. The utility model can rapidly and continuously pass through a plurality of 180-degree elbows and straight pipe sections with corrosion pit positions, the probe shell is prevented from directly contacting with the pipe wall, and the probability of abrasion of the probe body and damage to the built-in detection coil is reduced. Has the advantages of stable performance, small volume and weight, convenient carrying, and simple installation and operation.
Description
Technical Field
The utility model relates to an eddy-current nondestructive testing technology, which is suitable for self-reinforced ultra-high pressure tubular reactor internal testing, in particular to a pulse far-field eddy-current testing probe for an ultra-high pressure tubular reactor.
Background
The self-reinforced ultrahigh pressure tubular reactor is a key device in a large petrochemical low-density polyethylene production device, however, the self-reinforced ultrahigh pressure tubular reactor in most of the devices in China is put into use until now, and the nondestructive detection of the inner wall corrosion and cracks is rarely performed. The self-reinforced ultrahigh pressure tubular reactor is subjected to self-reinforced treatment before being put into production, and the elastic bearing capacity of the self-reinforced ultrahigh pressure tubular reactor is improved by improving the distribution of residual stress in the wall of the reactor. However, since the self-reinforced ultrahigh pressure tubular reactor is operated in a high-temperature and high-pressure environment for a long time, the self-reinforced residual stress is attenuated under the action of high-temperature and high-pressure waves, the attenuation of the residual stress can lead to the reduction of the stress superposition effect caused by the operation internal pressure, and the stress value of the inner wall surface of the reactor is increased; in addition, after long-term operation, residual stress attenuation can lead to the reduction of the residual life of the reactor, cracks appear on the inner wall, accidents such as leakage and explosion are caused, and huge economic loss and even casualties are caused. Therefore, the method has great significance for carrying out nondestructive testing on the inner wall of the self-reinforced ultrahigh pressure tubular reactor.
Pulse far-field eddy current testing belongs to one of eddy current testing techniques, and is different from common far-field eddy current testing. The pulse far-field eddy current detection adopts the square wave signal as an excitation source, so that the pulse far-field eddy current detection has stronger penetrating power on ferromagnetic material equipment, and the abundant frequency spectrum information of the square wave signal can acquire more defect information, so that the sensitivity of the pulse far-field eddy current detection is higher than that of a common far-field eddy current, and the defect can be distinguished to be positioned on the inner wall or the outer wall. Based on the method, the pulse far-field eddy current technology can be used as one of effective means for nondestructive detection scanning of the inner wall of the self-enhanced ultrahigh-pressure tubular reactor.
In the past, the inner wall vortex detection is carried out aiming at the self-reinforced ultrahigh pressure tubular reactor, the main adopted methods include multi-frequency vortex detection, far-field vortex detection and the like, and the adopted detection probes mainly adopt conventional internally-penetrating probes. The conventional internally penetrating probe generally consists of a protective shell and a detection coil, and a detector firstly places the probe in a reactor tube, and guides the probe to move in the reactor tube through a traction protective sleeve, so as to scan the internal structural integrity condition of the reactor. However, because the self-reinforced ultrahigh pressure tubular reactor consists of a plurality of sections of straight pipe sections and 180-degree elbows, the conventional internal-penetrating probe is often easy to block when passing through the 180-degree elbows or passing through the scour and corrosion pit parts, and the probe can be directly blocked at a certain part of the reactor and cannot be pulled out when serious; in addition, the conventional internally-penetrating probe has frequent abrasion to the probe body in the use process because the shell is directly contacted with the surface of the equipment, so that the built-in detection coil is not easy to protect.
Disclosure of Invention
Aiming at the problems existing in the prior art, the utility model provides a pulse far-field eddy current detection probe so as to realize rapid and continuous detection of a plurality of 180-degree elbows and straight pipe sections with corrosion pits in a self-reinforced ultrahigh-pressure pipe reactor, and reduce the probability of abrasion of a probe body and damage to a built-in detection coil.
In order to achieve the above purpose, the present utility model provides the following technical solutions: the pulse far-field eddy current detection probe for the ultrahigh pressure tubular reactor comprises a cylindrical probe shell, wherein one end of the probe shell is provided with a front end cover with a through hole in the center, the other end of the probe shell is provided with a rear end cover with a tubular joint in the center, and the tubular joint is provided with external threads and is connected with internal threads at one end of a traction protection sleeve; three pairs of supports are uniformly distributed on the periphery of the probe shell, each pair of supports consists of supports positioned at the front end and the rear end of the probe shell and are connected with a driving wheel through a wheel arm; the inner side of the front end cover in the probe shell is provided with a magnetic core exciting coil, the inner side of the rear end cover is provided with a receiving coil, the magnetic core exciting coil and the receiving coil are connected through a connecting rod, and one end of the connecting rod is fixedly connected with a central through hole of the front end cover through a nut; the magnetic core exciting coil is connected with a signal exciting line, the receiving coil is connected with a signal receiving line, and the signal exciting line and the signal receiving line are connected with a pulse far-field eddy current host through a traction protection sleeve connected with a tubular joint.
Further, the traction protection sleeve is a PVC spiral plastic reinforcement hose.
Further, the line between each pair of supports at the periphery of the probe housing is parallel to the axis of the probe housing.
Further, the receiving coil is composed of two circular framework differential coils, and the distance between the two circular frameworks is 5-10 mm.
In the detection operation construction link, detection personnel can guide the probe to move and scan in the reactor tube by traction of the protective sleeve. During scanning, the driving wheel is stably attached to the inner wall of the reaction tube, and the rapid and continuous passing of 180-degree elbows and straight tube sections with corrosion pits can be realized. Meanwhile, the probe shell is prevented from being in direct contact with the pipe wall, and the probability of abrasion of the probe body and damage to the built-in detection coil is reduced. Has the advantages of stable performance, small volume and weight, convenient carrying, and simple installation and operation.
Drawings
FIG. 1 is a schematic view of the external form and the three-dimensional structure of the present utility model;
FIG. 2 is a schematic view of the structure of the front end cap of the present utility model;
FIG. 3 is a schematic cross-sectional view of the internal structure of the present utility model;
in the figure: 1-probe shell, 2-front end cover, 3-rear end cover, 31-tubular joint, 4-support, 5-arm, 6-drive wheel, 7-signal receiving line, 8-signal excitation line, 9-magnetic core excitation coil, 10-receiving coil, 11-connecting rod, 12-nut, 13-reactor tube wall, 14-traction protection sleeve.
Detailed Description
The utility model is further described below with reference to the drawings and examples. Referring to fig. 1 to 3, a pulse far-field eddy current testing probe for an ultra-high pressure tubular reactor comprises a cylindrical probe housing 1, a front end cover 2 with a through hole in the center is installed at one end of the probe housing 1, and the front end cover 2 is screwed with the internal thread of the probe housing 1 through the peripheral thread. The other end is provided with a rear end cover 3 with a tubular joint 31 at the center outside, and the rear end cover 3 is screwed with the internal thread of the probe shell 1 through the peripheral thread. The tubular joint 31 is provided with external threads and is connected with internal threads at one end of the traction protection sleeve 14; three pairs of supports 4 are uniformly distributed on the periphery of the probe shell 1, each pair of supports 4 consists of supports 4 positioned at the front end and the rear end of the probe shell 1 and each support 4 is connected with a driving wheel 6 through a wheel arm 5; the inner side of the front end cover 2 in the probe shell 1 is provided with a magnetic core exciting coil 9, the inner side of the rear end cover 3 is provided with a receiving coil 10, the magnetic core exciting coil 9 and the receiving coil 10 are connected through a connecting rod 11, and one end of the connecting rod 11 is fixedly connected with the central through hole of the front end cover 2 through a nut; the magnetic core exciting coil 9 is connected with a signal exciting line 8, the receiving coil 10 is connected with a signal receiving line 7, and the signal exciting line 8 and the signal receiving line 7 are connected with a pulse far-field eddy current host through a traction protection sleeve 14 connected with a tubular joint 31. The traction protection sleeve 14 is a PVC spiral plastic reinforcement hose. The line between each pair of abutments 4 on the periphery of the probe housing 1 is parallel to the axis of the probe housing 1. The receiving coil 10 is composed of two circular framework differential coils, and the distance between the two circular frameworks is 5-10 mm.
Examples
The outer periphery of the probe shell 1 is fixedly welded with three pairs of supports 4, each two supports 4 are in a pair, a connecting line between the two supports 4 is parallel to the axis of the probe shell 1, wheel arms 5 are respectively arranged on the supports 4 through bolts, and driving wheels 6 are arranged at the outer ends of the wheel arms 5 through bolts (as shown in figures 1 and 2).
The detection coil is formed by combining a connecting rod 11, a magnetic core exciting coil 9, two receiving coils 10, a signal exciting wire 8 and a signal receiving wire 7, wherein one end of the connecting rod 11 is provided with threads and penetrates through a central hole of the front end cover 2 to be fixed through a nut 12. The magnetic core exciting coil 9 is composed of a round magnetic core and enamelled wires wound outside the round magnetic core, the receiving coil 10 is composed of a round plastic skeleton and enamelled wires wound outside the round plastic skeleton, and each winding of 1/2 circle of enamelled wires is subjected to gluing and fixing treatment. Penetrating the magnetic core exciting coil 9 into the connecting rod 11, and fixedly connecting the magnetic core exciting coil 9 to the connecting rod 11 adjacent to the inner side of the front end cover 2 by adopting hot melt adhesive; the receiving coil 10 is penetrated into the connecting rod 11, and the receiving coil 10 is fixedly connected to the connecting rod 11 adjacent to the inner side of the rear end cover 3 by adopting hot melt adhesive. One end of the signal exciting line 8 is connected with the magnetic core exciting coil 9, one end of the signal receiving line 7 is connected with the receiving coil 10, and the other ends of the signal exciting line 8 and the signal receiving line 7 are connected with a pulse far-field eddy current main machine (WTEM-3Q type pulse far-field eddy current detector) (as shown in figure 3).
Because the failure mode of the self-reinforced ultrahigh pressure tubular reactor mainly exists in the operation process is cracking and local corrosion, the receiving coil 10 is formed by two circular frameworks by adopting differential coils, and the distance is set to be 5-10 mm according to the test result. According to the far-field eddy current detection principle, the distance between the magnetic core exciting coil 9 and the receiving coil 10 is 2-3 times of the inner diameter of the ultrahigh-pressure tubular reactor. The tubular fitting 31 is threadedly connected to the traction protection sleeve 14.
When the utility model is used, firstly, the detection probe is placed in the reactor pipe wall 13, so that the six driving wheels 6 are in supporting contact with the reactor pipe wall 13, the movement position of the detection probe in the reactor pipe wall 13 is controlled by the traction protection sleeve 14, and in the movement process, the phenomena of over-high speed and over-large traction action range are avoided. The WTEM-3Q type pulse far-field vortex detector is used for outputting signals, so that effective qualitative and quantitative detection of cracks and local corrosion existing in the inner wall of the self-reinforced ultrahigh-pressure tubular reactor can be realized.
The pulse far-field vortex host machine provided by the utility model has the following model: WTEM-3Q. The probe shell 1, the front end cover 2, the rear end cover 3, the support 4, the wheel arm 5 and the connecting rod 11 are made of hard polyvinyl chloride or modified polypropylene or polyolefin materials. The magnetic core in the magnetic core exciting coil 9 is made of ferrite or silicon steel sheet material. The circular backbone, nut 12 and other nuts and screws used for fastening in the receiving coil 10 are made of PC material.
The utility model can realize more efficient quantitative and qualitative detection of local corrosion and crack defects in the self-reinforced ultrahigh-pressure tubular reactor, realizes continuous crawling scanning of the pulse far-field eddy current probe, greatly enhances the ability of the probe to smoothly pass through discontinuous obstacles with structures such as elbows, corrosion pits and the like, effectively reduces the probability of probe abrasion and pipe blockage, and has the advantages of more flexible and convenient use, safety and reliability.
Claims (4)
1. The pulse far-field eddy current detection probe for the ultrahigh-pressure tubular reactor is characterized by comprising a cylindrical probe shell, wherein one end of the probe shell is provided with a front end cover with a through hole in the center, the other end of the probe shell is provided with a rear end cover with a tubular joint in the center, and the tubular joint is provided with external threads and is connected with internal threads at one end of a traction protection sleeve; three pairs of supports are uniformly distributed on the periphery of the probe shell, each pair of supports consists of supports positioned at the front end and the rear end of the probe shell and are connected with a driving wheel through a wheel arm; the inner side of the front end cover in the probe shell is provided with a magnetic core exciting coil, the inner side of the rear end cover is provided with a receiving coil, the magnetic core exciting coil and the receiving coil are connected through a connecting rod, and one end of the connecting rod is fixedly connected with a central through hole of the front end cover through a nut; the magnetic core exciting coil is connected with a signal exciting line, the receiving coil is connected with a signal receiving line, and the signal exciting line and the signal receiving line are connected with a pulse far-field eddy current host through a traction protection sleeve connected with a tubular joint.
2. The pulsed far field eddy current inspection probe for an ultra-high pressure tubular reactor of claim 1, wherein the traction protection sleeve is a PVC spiral plastic reinforcement hose.
3. The pulsed far field eddy current probe for an ultra-high pressure tube reactor according to claim 1, wherein a line between each pair of standoffs at the outer periphery of the probe housing is parallel to the axis of the probe housing.
4. The pulsed far-field eddy current testing probe for an ultrahigh-pressure tubular reactor according to claim 1, wherein the receiving coil is composed of two circular framework differential coils, and the distance between the two circular frameworks is 5-10 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321671977.7U CN220019470U (en) | 2023-06-29 | 2023-06-29 | Pulse far-field eddy current detection probe for ultrahigh pressure tubular reactor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321671977.7U CN220019470U (en) | 2023-06-29 | 2023-06-29 | Pulse far-field eddy current detection probe for ultrahigh pressure tubular reactor |
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| Publication Number | Publication Date |
|---|---|
| CN220019470U true CN220019470U (en) | 2023-11-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321671977.7U Active CN220019470U (en) | 2023-06-29 | 2023-06-29 | Pulse far-field eddy current detection probe for ultrahigh pressure tubular reactor |
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| Country | Link |
|---|---|
| CN (1) | CN220019470U (en) |
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2023
- 2023-06-29 CN CN202321671977.7U patent/CN220019470U/en active Active
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