CN217908985U - Reboiler jar body defect repair structure - Google Patents
Reboiler jar body defect repair structure Download PDFInfo
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- CN217908985U CN217908985U CN202222188015.8U CN202222188015U CN217908985U CN 217908985 U CN217908985 U CN 217908985U CN 202222188015 U CN202222188015 U CN 202222188015U CN 217908985 U CN217908985 U CN 217908985U
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Abstract
The utility model discloses a reboiler tank defect repair structure, wherein a corrosion-resistant welding plate is provided with a plurality of plug welding holes, welding fluxes are filled in the plug welding holes, and the plug welding holes are used for positioning the corrosion-resistant welding plate in a corrosion area; the corrosion area is provided with a first groove, the corrosion-resistant welding plate is provided with a second groove, the first groove and the second groove are covered to form a flow channel, solder for connecting the inner wall of the tank body and the corrosion-resistant welding plate is filled in the flow channel, the flow channel is snakelike or netted, one end of the flow channel is provided with a first pouring gate, the other end of the flow channel is provided with a second pouring gate, and the height of the first pouring gate in the vertical direction is larger than that of the second pouring gate; the edge of the corrosion-resistant welding plate is welded with the inner wall of the tank body. To the corrosion area of large tracts of land, set up a small amount of corrosion-resistant welding plate and can accomplish the restoration, reduce the restoration work load of the reboiler in petrochemical field to a great extent, the equipment life after the restoration prolongs greatly, can prolong more than 2 inspection cycle, more than 6 years promptly.
Description
Technical Field
The utility model relates to a metallic tank body restores technical field, especially relates to a reboiler jar body defect repair structure.
Background
The reboiler is the important purification equipment in petrochemical field, has firing equipment in it, is heated in the material and forms ascending steam flow, discharges from the reboiler top, and impurity liquid then discharges from the reboiler bottom. Since the material in the reboiler usually contains sand or other hard impurities, it collides with the inner wall of the reboiler at high temperature and high pressure, causing corrosion of the inner wall. As shown in fig. 1, the corrosion area of the reboiler inner wall is large, there are corrosion pits with different depths in the corrosion area, and the current treatment mode is to perform spot welding repair welding on the deeper corrosion pits (the effect after repair welding in fig. 2), and not to perform treatment on the shallower corrosion pits. This approach has limited life extension for the equipment, and can only extend a three year test cycle at most.
In the prior art, defects of the inner wall of a metal container are repaired by adopting a plate repairing welding mode, for example, a defect repairing method of a weld overlay of the inner wall of a PTA reactor disclosed in patent 201320215277.7, a layer of flitch is welded on a corrosion area, two rows of plug welding holes are drilled on each flitch at intervals, and a steel plate is cut into 4 x 200 x 4000mm pieces by adopting a shearing method; 4X 150X 4000mm in size, 1 piece, and the size of the patch is smaller. The corrosion area of the reboiler is usually large, and occupies one third to one half of the inner wall area, and this method is very troublesome and labor-intensive to repair if applied to a large-sized reboiler.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a reboiler jar body defect repair structure to plug welding combines to water the material and mends the board in corrosion zone, and equipment long service life after the restoration, the restoration work load is little.
To achieve the purpose, the utility model adopts the following technical proposal:
a defect repairing structure of a reboiler tank body comprises a tank body, wherein a corrosion-resistant layer is arranged on the inner wall of the tank body, a corrosion area is arranged on the inner wall of the tank body, punctiform corrosion pits are arranged in the corrosion area, the corrosion pits are positioned on the corrosion layer or penetrate through the corrosion layer, and a corrosion-resistant welding plate covers the corrosion area;
the corrosion-resistant welding plate is provided with a plurality of plug welding holes, welding materials are filled in the plug welding holes, and the plug welding holes are used for positioning the corrosion-resistant welding plate in the corrosion area;
the corrosion area is provided with a first groove, the corrosion-resistant welding plate is provided with a second groove, the first groove and the second groove are covered to form a flow channel, solder for connecting the inner wall of the tank body and the corrosion-resistant welding plate is filled in the flow channel, the flow channel is snakelike or netted, one end of the flow channel is provided with a first pouring gate, the other end of the flow channel is provided with a second pouring gate, and the height of the first pouring gate in the vertical direction is greater than that of the second pouring gate;
the edge of the corrosion-resistant welding plate is welded with the inner wall of the tank body.
Further, the width of the first groove and the width of the second groove are both 4-8mm.
Further, the depth of the first groove is the same as the thickness of the corrosion-resistant layer;
the depth of the second groove is one third of the thickness of the corrosion-resistant welding plate.
Further, the thickness of the corrosion-resistant layer is 3mm, and the thickness of the corrosion-resistant welding plate is 3-4mm;
the corrosion-resistant layer and the corrosion-resistant welding plate are made of stainless steel.
Further, the width of the first gate is 15-30mm.
Furthermore, the width of the corrosion-resistant welding plate is 50-100cm, and the length of the corrosion-resistant welding plate is 100-150cm.
Furthermore, when the flow channel is in a serpentine shape, the serpentine flow channel is a plurality of flow channels arranged side by side, one end of each serpentine flow channel is communicated with the first gate, and the other end of each serpentine flow channel is communicated with the second gate;
the width of the coverage area of the snakelike flow channels is 5-10cm, and the distance between every two adjacent snakelike flow channels is 10-20cm;
and the plug welding hole is arranged between the two adjacent snake-shaped runners.
Furthermore, the defect repairing structure of the reboiler tank further comprises a corrosion-resistant metal layer arranged by a cold spraying process, and the corrosion-resistant metal layer covers the inner wall of the tank body with the corrosion-resistant welding plate.
Furthermore, the thickness of the corrosion-resistant metal layer is 0.8-2mm.
The utility model provides a technical scheme can include following beneficial effect:
the utility model discloses an among the restoration structure, realize through stopper welding hole and runner that corrosion-resistant welding plate is fixed in the corrosion area of reboiler, can reduce the quantity in stopper welding hole and the size of the corrosion-resistant welding plate of increase at to a great extent, therefore, to the corrosion area of large tracts of land, set up a small amount of corrosion-resistant welding plate and can accomplish the restoration, reduce the restoration work load of the reboiler in the petrochemical field at to a great extent, the equipment life after the restoration prolongs greatly, can prolong more than 2 check cycles, more than 6 years promptly.
Drawings
The accompanying drawings are used for further explaining the present invention, but the content in the accompanying drawings does not constitute any limitation to the present invention.
FIG. 1 is a photograph showing the corrosion of the inner wall of the reboiler;
FIG. 2 is a diagram illustrating the effect of spot welding on the inner wall of a reboiler in the prior art;
fig. 3 is a schematic cross-sectional view of a defect repair structure of a reboiler tank according to an embodiment of the present invention;
fig. 4 is a schematic view of a defect repairing structure of a reboiler tank according to an embodiment of the present invention;
fig. 5 is a schematic view of a reboiler tank defect repairing structure according to another embodiment of the present invention;
FIG. 6 is a schematic view of a defect repair structure of a reboiler tank body provided with a plurality of corrosion-resistant welding plates according to one embodiment of the present invention;
in the drawings: 1-a tank body, 2-a corrosion-resistant layer, 21-a corrosion pit, 23-a first groove, 3-a corrosion welding plate, 31-a plug welding hole, 32-a second groove, 4-a flow channel, 41-a first pouring gate, 42-a second pouring gate and 5-a corrosion-resistant metal layer.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.
As shown in fig. 3-6, the reboiler tank defect repair structure of this embodiment includes a tank 1, the inner wall of the tank 1 is provided with a corrosion-resistant layer 2, the inner wall of the tank 1 is provided with a corrosion area, the corrosion area is provided with punctiform corrosion pits 21, the corrosion pits 21 are located on or penetrate through the corrosion layer, and the corrosion area is covered with a corrosion-resistant welding plate 3;
the corrosion-resistant welding plate 3 is provided with a plurality of plug welding holes 31, the plug welding holes 31 are filled with welding flux, and the plug welding holes 313 are used for positioning the corrosion-resistant welding plate 3 in a corrosion area;
the corrosion area is provided with a first groove 23, the corrosion-resistant welding plate 3 is provided with a second groove 32, the first groove 23 and the second groove cover 32 are combined to form a flow channel 4, the flow channel 4 is filled with solder for connecting the inner wall of the tank body 1 and the corrosion-resistant welding plate 3, the flow channel 4 is in a snake shape or a net shape, one end of the flow channel 4 is provided with a first pouring gate 41, the other end of the flow channel 4 is provided with a second pouring gate 42, and the height of the first pouring gate 41 in the vertical direction is larger than that of the second pouring gate 42;
the edge of the corrosion-resistant welding plate 3 is welded with the inner wall of the tank body 1.
In the repair structure of this embodiment, realize through plug welding hole 31 and runner 4 that corrosion-resistant welded plate 3 is fixed in the corrosion area of reboiler, can reduce the quantity in plug welding hole 31 and increase corrosion-resistant welded plate 3's size at to a great extent, from this, to the corrosion area of large tracts of land, set up a small amount of corrosion-resistant welded plate 3 and can accomplish the restoration, reduce the repair work volume of the reboiler in the petrochemical field at to a great extent. Moreover, the corrosion-resistant welding plate 3 in the embodiment is made of the same material as the inner wall of the reboiler, so that the corrosion-resistant welding plate has a good corrosion-resistant effect, the service life of the repaired equipment is greatly prolonged, and more than 2 inspection periods, namely more than 6 years, can be prolonged.
Before welding the corrosion-resistant welding plate 3 in the corrosion area, the corrosion area needs to be polished to remove an oxide layer on the surface and fill the relatively deep corrosion pit 21, preferably, the corrosion pit 21 with a depth greater than 4mm is subjected to spot welding, and the protruding welding spot is polished to be flat. The corrosion-resistant welding plate 3 is bent to have the same radian with the inner wall of the reboiler.
The reboiler tank defect repair structure of this embodiment is adopted to carry out the repair process as follows:
a grinding machine is adopted to grind a first groove 23 in the corrosion-resistant area, a second groove 32 is arranged on the corrosion-resistant welding plate 3 in a punch forming mode or a rolling forming mode, the size and the number of the corrosion-resistant welding plate 3 are set according to the size of the corrosion-resistant area, then a plug welding hole 31 is arranged on the corrosion-resistant plate 3 according to the position of the flow channel 4, and optionally, the plug welding hole 31 can be formed on the corrosion-resistant welding plate 3 in a punching mode;
then, arranging solder in the plug welding holes 31, positioning the corrosion-resistant welding plates 3 in a corrosion area, welding the edges of the corrosion-resistant welding plates 3 on the inner wall of the reboiler, and if the corrosion-resistant welding plates 3 are provided with a plurality of welding materials, welding the edges of two adjacent corrosion-resistant welding plates 3;
melting the solder in the heating cavity into a casting material by adopting the existing solder melting equipment, wherein the casting material enters the runner from the first pouring gate 41 and flows to the second pouring gate 42 along the runner 4, and the casting material is stopped pouring after the runner is filled with the casting material;
and (5) standing and cooling, and polishing the welding position of the edge of the corrosion-resistant welding plate 3 to be flat.
It can be understood that the plug welding hole 31 is arranged at a position which avoids the position of the runner 4, and the interference between the plug welding hole and the runner is prevented from influencing the plate repairing effect. Preferably, plug weld hole 31 sets up at the edge of corrosion-resistant board 3 that welds and the inside position equipartition distribution of corrosion-resistant board 3 that welds to guarantee better positioning effect, can also prevent that corrosion-resistant board 3 from being heated deformation when pouring into and watering, after the restoration is accomplished, corrosion-resistant board 3 that welds can closely laminate the inner wall at the reboiler.
It will be appreciated that the gates are wider openings at the inlet and outlet ends of the flow channel, and that the first gate 41 serves to facilitate connection of the flow channel to the solder melting apparatus and to facilitate pouring of the molten solder into the flow channel.
Preferably, the width of each of the first and second grooves 23 and 32 is 4 to 8mm. Therefore, the runner 4 with the width of 4-8mm can be formed, the sufficient width is better in pouring fluidity, and the corrosion-welded plate 3 can be prevented from deforming. It is further preferred that the width of the first groove 23 and the second groove 32 is 6-8mm.
In order to easily form the first groove 23 in the inner wall of the reboiler, the depth of the first groove 23 is the same as the thickness of the corrosion-resistant layer 2, and it is easier to control the depth of the first groove 23. The depth of the second groove 32 is one third of the thickness of the corrosion-resistant welding plate 3, the corrosion-resistant welding plate 3 still has enough thickness at the flow channel 4, on one hand, the mechanical strength of the corrosion-resistant welding plate 3 can be ensured, on the other hand, the corrosion-resistant welding plate 3 at the flow channel has enough thickness, and the deformation cannot occur when the pouring material passes through, so that the qualified welding effect is achieved.
In the prior art, the corrosion-resistant layer on the inner wall of the reboiler is a stainless steel layer, the thickness of the corrosion-resistant layer 2 is 3mm, and in order to enable the corrosion-resistant welded plate 3 to have the same corrosion-resistant effect as the corrosion-resistant layer 2, the thickness of the corrosion-resistant welded plate 3 is 3-4mm; the corrosion-resistant layer 2 and the corrosion-resistant welding plate 3 are made of stainless steel. Based on the consistent corrosion resistance effect of the two, the two have the same service life.
In this embodiment, the first gate 41 is used for connecting the solder melting device, the width of the first gate 41 is limited to 15-30mm, and a larger width can better connect the solder melting device, thereby reducing the process difficulty.
Based on the plug weld holes 31 and the flow passages 4 of the present embodiment, the corrosion resistant weld plate 3 may have a relatively large size, and in some embodiments, the corrosion resistant weld plate 3 has a width of 50-100cm and a length of 100-150cm. The large-size welding plate can effectively reduce the work intensity of the reboiler repair and improve the efficiency of the reboiler repair. Preferably, the width of the corrosion-resistant welding plate 3 is 80-100cm, and the length is 120-150cm.
In some embodiments, the flow channels 4 are serpentine, the serpentine flow channels 4 are arranged in parallel, one end of each serpentine flow channel 4 is communicated with the first gate 41, and the other end of each serpentine flow channel is communicated with the second gate 42; the width of the coverage area of the snake-shaped flow channels is 5-10cm, and the distance between two adjacent snake-shaped flow channels 4 is 10-20cm; and plug welding holes 31 are formed between two adjacent serpentine flow channels.
In other embodiments, as shown in fig. 5 and 6, the flow channel 4 is in a net shape, one end of the net-shaped flow channel 4 is provided with a first gate 41, and the other end of the net-shaped flow channel is provided with a second gate 42. The inner space of the netlike flow channel 4 is also provided with plug weld holes 31.
The reboiler tank defect repair structure of this embodiment still includes corrosion-resistant metal layer 5 with cold spraying process setting, and corrosion-resistant metal layer 5 covers the inner wall of the tank body that has corrosion-resistant welded plate 3. The corrosion-resistant metal layer 5 can cover the damage of the inner wall of the reboiler and the edge of the corrosion-resistant welding plate 3 caused by polishing. In addition, based on the setting of plug weld hole 31 for the surface of corrosion-resistant welded plate 4 is not level and smooth enough, enables the reboiler inner wall enough to level on the whole through setting up corrosion-resistant metal level 5, and makes corrosion-resistant welded plate 3 level and smooth with reboiler inner wall junction, can further improve corrosion-resistant effect. Optionally, the corrosion-resistant metal layer is 022Cr17Ni12Mo2.
Preferably, the thickness of the corrosion-resistant metal layer 5 is 0.8 to 2mm. Further preferably, the thickness of the corrosion-resistant metal layer 5 is 1mm.
The technical principle of the present invention is described above with reference to specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive efforts, and such equivalent modifications or substitutions are intended to be included within the scope of the present invention as defined in the appended claims.
Claims (9)
1. A defect repairing structure of a reboiler tank body comprises a tank body, wherein a corrosion-resistant layer is arranged on the inner wall of the tank body, a corrosion area is arranged on the inner wall of the tank body, punctiform corrosion pits are arranged in the corrosion area and are positioned on the corrosion layer or penetrate through the corrosion layer, and a corrosion-resistant welding plate covers the corrosion area;
the corrosion-resistant welding plate is provided with a plurality of plug welding holes, welding materials are filled in the plug welding holes, and the plug welding holes are used for positioning the corrosion-resistant welding plate in the corrosion area;
the corrosion area is provided with a first groove, the corrosion-resistant welding plate is provided with a second groove, the first groove and the second groove are covered to form a flow channel, solder for connecting the inner wall of the tank body and the corrosion-resistant welding plate is filled in the flow channel, the flow channel is snakelike or netted, one end of the flow channel is provided with a first pouring gate, the other end of the flow channel is provided with a second pouring gate, and the height of the first pouring gate in the vertical direction is greater than that of the second pouring gate;
the edge of the corrosion-resistant welding plate is welded with the inner wall of the tank body.
2. The reboiler tank defect repair structure of claim 1, wherein the width of the first groove and the second groove are both 4-8mm.
3. The reboiler tank defect repair structure of claim 2, wherein the depth of said first groove is the same as the thickness of said corrosion-resistant layer;
the depth of the second groove is one third of the thickness of the corrosion-resistant welding plate.
4. The reboiler tank defect repair structure according to claim 3, wherein the corrosion-resistant layer has a thickness of 3mm, and the corrosion-resistant weld plate has a thickness of 3-4mm;
the corrosion-resistant layer and the corrosion-resistant welding plate are made of stainless steel.
5. The reboiler tank defect repair structure of claim 2, wherein the width of the first gate is 15-30mm.
6. The reboiler tank defect repair structure of claim 1, wherein the corrosion resistant weld plate has a width of 50-100cm and a length of 100-150cm.
7. The reboiler tank defect repair structure of claim 6, wherein when the flow passages are serpentine shaped, the serpentine shaped flow passages are arranged in a plurality of rows, one end of each serpentine shaped flow passage is communicated with the first gate, and the other end of each serpentine shaped flow passage is communicated with the second gate;
the width of the coverage area of the snakelike flow channels is 5-10cm, and the distance between every two adjacent snakelike flow channels is 10-20cm;
and the plug welding hole is arranged between the two adjacent snakelike runners.
8. The reboiler tank defect repair structure of claim 1, further comprising a corrosion resistant metal layer disposed in a cold spray process, said corrosion resistant metal layer covering the inner wall of said tank with said corrosion resistant weld plate.
9. The reboiler tank defect repair structure of claim 8, wherein the thickness of the corrosion-resistant metal layer is 0.8-2mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222188015.8U CN217908985U (en) | 2022-08-19 | 2022-08-19 | Reboiler jar body defect repair structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222188015.8U CN217908985U (en) | 2022-08-19 | 2022-08-19 | Reboiler jar body defect repair structure |
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| CN217908985U true CN217908985U (en) | 2022-11-29 |
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| CN202222188015.8U Active CN217908985U (en) | 2022-08-19 | 2022-08-19 | Reboiler jar body defect repair structure |
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- 2022-08-19 CN CN202222188015.8U patent/CN217908985U/en active Active
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