CN115156839B - Method for repairing defects of reboiler tank body - Google Patents
Method for repairing defects of reboiler tank body Download PDFInfo
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- CN115156839B CN115156839B CN202210997387.7A CN202210997387A CN115156839B CN 115156839 B CN115156839 B CN 115156839B CN 202210997387 A CN202210997387 A CN 202210997387A CN 115156839 B CN115156839 B CN 115156839B
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000007547 defect Effects 0.000 title claims abstract description 25
- 238000005260 corrosion Methods 0.000 claims abstract description 154
- 230000007797 corrosion Effects 0.000 claims abstract description 150
- 238000003466 welding Methods 0.000 claims abstract description 132
- 239000000463 material Substances 0.000 claims abstract description 70
- 238000005266 casting Methods 0.000 claims abstract description 53
- 238000002844 melting Methods 0.000 claims abstract description 36
- 230000008018 melting Effects 0.000 claims abstract description 36
- 230000008439 repair process Effects 0.000 claims abstract description 18
- 229910000679 solder Inorganic materials 0.000 claims abstract description 13
- 238000001816 cooling Methods 0.000 claims abstract description 6
- 230000007246 mechanism Effects 0.000 claims description 14
- 239000002184 metal Substances 0.000 claims description 12
- 238000007599 discharging Methods 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 6
- 229910001220 stainless steel Inorganic materials 0.000 claims description 6
- 239000010935 stainless steel Substances 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 4
- 239000011261 inert gas Substances 0.000 claims description 4
- 230000000630 rising effect Effects 0.000 claims description 4
- 238000003490 calendering Methods 0.000 claims description 3
- 238000010288 cold spraying Methods 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 13
- 238000007689 inspection Methods 0.000 description 3
- 238000005498 polishing Methods 0.000 description 3
- 230000004907 flux Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P6/00—Restoring or reconditioning objects
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- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
Abstract
The invention discloses a method for repairing defects of a reboiler tank body, which comprises the following steps: (1) A plug welding hole is formed in the corrosion-resistant welding plate, a first groove is formed in the corrosion area, a second groove is formed in one side face of the corrosion-resistant welding plate, and the second groove extends from one end of the corrosion-resistant welding plate to the other end of the corrosion-resistant welding plate; (2) Positioning the corrosion-resistant welding plate in the corrosion area through the plug welding holes in a plug welding mode, and enabling the first groove and the second groove to be covered to form a flow passage, wherein the flow passage is in a serpentine shape or a net shape; (3) Melting the solder into a casting material by using solder melting equipment, enabling the casting material to flow from one end of the runner to the other end, and stopping pouring the casting material after the casting material fills the runner; (4) And after cooling, welding the edge of the corrosion-resistant welding plate with the inner wall of the tank body. And the repair is carried out in the corrosion area by combining plug welding with the casting material, so that the service life of the repaired equipment is long, and the repair workload is small.
Description
Technical Field
The invention relates to the technical field of special equipment maintenance, in particular to a method for repairing defects of a reboiler tank.
Background
The reboiler is an important purification device in the petrochemical field, and heating equipment is arranged in the reboiler, and is used for forming rising steam flow based on heating in materials, discharging from the top of the reboiler, and discharging impurity liquid from the bottom of the reboiler. Since the material in the reboiler usually contains sand particles or other hard impurities, the material collides with the inner wall of the reboiler under high temperature and high pressure, and the inner wall of the reboiler is corroded. As shown in FIG. 1, the inner wall of the reboiler has large corrosion area, corrosion pits with different depths are arranged in the corrosion area, the prior treatment mode is to carry out spot welding repair welding (effect after repair welding in FIG. 2) on the deeper corrosion pits, and the shallower corrosion pits are not treated. This approach is limited to the extended life of the device, and can only extend the inspection cycle of a particular device by at most a three year meter.
In the prior art, a repair plate welding mode is also adopted to repair the defects of the inner wall of a metal container, as 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 multiplied by 200 multiplied by 4000mm and 90 pieces by adopting a shearing method; 4×150×4000mm,1 piece, and the size of the patch is small. The reboiler usually has a large corrosion area, which can occupy one third to one half of the inner wall area, and the method can make the repairing process very complicated and labor-intensive if applied to a large reboiler.
Disclosure of Invention
The invention aims to provide a method for repairing the defects of a reboiler tank body, which is used for repairing plates in a corrosion area by combining plug welding with casting materials, and has the advantages of long service life of repaired equipment and small repair workload.
To achieve the purpose, the invention adopts the following technical scheme:
a reboiler tank defect repairing method 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 the corrosion pits are positioned on or penetrate through the corrosion-resistant layer;
the method comprises the following steps:
(1) A plug welding hole is formed in the corrosion-resistant welding plate, a first groove is formed in the corrosion area, a second groove is formed in one side face of the corrosion-resistant welding plate, and the second groove extends from one end of the corrosion-resistant welding plate to the other end of the corrosion-resistant welding plate;
(2) Positioning the corrosion-resistant welding plate in the corrosion area through the plug welding holes in a plug welding mode, and enabling the first groove and the second groove to be covered to form a flow passage, wherein the flow passage is in a serpentine shape or a net shape;
(3) Melting the solder into a casting material by using solder melting equipment, enabling the casting material to flow from the top end to the bottom end of the runner, and stopping pouring the casting material after the runner is full of the casting material;
(4) And after cooling, welding the edge of the corrosion-resistant welding plate with the inner wall of the tank body.
Further, in the step (3), the runner is heated to 200-300 ℃, the top end flows to the bottom end, and the runner is filled with the casting material.
Further, in the step (3), after the pouring material fills the runner, cooling the bottom end of the runner to a state that the pouring material seals the bottom end of the runner; and then pressurizing the casting materials in the runner at the top end of the runner, and if bubbles exist in the casting materials in the runner, rising the bubbles to the top end of the runner under the action of pressure.
Further, the solder melting equipment comprises a melting cavity and a pressurizing mechanism, wherein a heating wire is wound on the outer wall of the melting cavity, the bottom of the melting cavity is communicated with a discharging channel, and the tail end of the discharging channel is communicated with the top end of the flow channel;
the pressurizing mechanism is used for introducing inert gas into the melting cavity so as to pressurize the melted casting material in the melting cavity and further pressurize the casting material in the runner.
Further, in the step (1), the plug welding holes are formed in the corrosion-resistant welding plate in a stamping forming mode;
and the second groove is formed in the corrosion-resistant welding plate in a stamping forming mode or a calendaring forming mode.
Further, the widths of the first groove and the second groove are 4-8mm;
the depth of the first groove is the same as the thickness of the corrosion-resistant layer, and the depth of the second groove is one third of the thickness of the corrosion-resistant welding plate.
Further, the pouring inlet end of the runner is a first pouring gate, and the pouring outlet of the runner is a second pouring gate;
the width of the first gate and the width of the second gate are both larger than the width of the runner, and the width of the first gate is 15-30mm.
Further, when the flow passage is in a serpentine shape, the plurality of serpentine flow passages are arranged side by side, one end of each serpentine flow passage is communicated with the first sprue, and the other end of each serpentine flow passage is communicated with the second sprue;
the width of the covering area of each serpentine flow channel is 5-10cm, and the distance between every two adjacent serpentine flow channels is 10-20cm;
the plug welding holes are arranged between the flow passages of two adjacent snakelike shapes.
Further, the width of the corrosion-resistant welding plate is 50-100cm, and the length of the corrosion-resistant welding plate is 100-150cm;
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 reboiler tank defect repairing method further comprises the following step (5): spraying a corrosion-resistant metal layer on the inner wall of the tank body with the corrosion-resistant welding plate by using a cold spraying process;
the thickness of the corrosion-resistant metal layer is 0.8-2mm.
The beneficial effects of the invention are as follows:
according to the repairing method, the corrosion-resistant welding plates are fixed in the corrosion area of the reboiler through the plug welding holes and the flow channels, so that the number of the plug welding holes can be reduced to a great extent, the size of the corrosion-resistant welding plates can be increased, and therefore, for a large-area corrosion area, the repairing can be completed by arranging a small number of the corrosion-resistant welding plates, the repairing workload of the reboiler in the petrochemical field is reduced, the service life of the repaired equipment is greatly prolonged, and the inspection period can be prolonged by more than 2 years, namely more than 6 years.
Drawings
The present invention is further illustrated by the accompanying drawings, which are not to be construed as limiting the invention in any way.
FIG. 1 is a picture of the corrosion of the inner wall of a reboiler;
FIG. 2 is a graph showing the effect of repairing the inner wall of a reboiler by spot welding in the prior art;
FIG. 3 is a flow chart of a reboiler tank defect repair method according to one embodiment of the present invention;
FIG. 4 is a schematic cross-sectional view of a reboiler tank defect repair structure according to one embodiment of the present invention;
FIG. 5 is a schematic illustration of a reboiler tank defect repair structure in accordance with one embodiment of the present invention;
FIG. 6 is a schematic illustration of a reboiler tank defect repair structure in accordance with another embodiment of the present invention;
FIG. 7 is a schematic illustration of a reboiler tank defect repair structure provided with a plurality of corrosion resistant welded plates, in accordance with one embodiment of the present invention;
FIG. 8 is a schematic illustration of a support mechanism of a reboiler tank defect repair structure mated with a tank;
FIG. 9 is a schematic view of a solder melting apparatus;
in the accompanying drawings: 1-tank body, 2-corrosion-resistant layer, 21-corrosion pit, 23-first groove, 3-corrosion welding plate, 31-plug welding hole, 32-second groove, 4-runner, 41-first runner, 42-second runner, 5-corrosion-resistant metal layer, supporting mechanism 6, melting cavity 7, blanking channel 71, heat preservation layer 72, pressurizing mechanism 8.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly, for distinguishing between the descriptive features, and not sequentially, and not lightly.
In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The technical scheme of the invention is further described below by the specific embodiments with reference to the accompanying drawings.
As shown in fig. 3-9, the invention provides a method for repairing the defects of a reboiler tank body, which comprises a tank body, wherein the inner wall of the tank body is provided with a corrosion-resistant layer, the inner wall of the tank body is provided with a corrosion area, the corrosion area is internally provided with punctiform corrosion pits, and the corrosion pits are positioned on or penetrate through the corrosion-resistant layer;
the method comprises the following steps:
(1) A plug welding hole is formed in the corrosion-resistant welding plate, a first groove is formed in the corrosion area, a second groove is formed in one side surface of the corrosion-resistant welding plate, and the second groove extends from one end of the corrosion-resistant welding plate to the other end of the corrosion-resistant welding plate;
(2) Positioning the corrosion-resistant welding plate in a corrosion area through a plug welding hole in a plug welding mode, and enabling the first groove and the second groove to be covered to form a flow passage, wherein the flow passage is in a serpentine shape or a net shape;
(3) Melting the solder into a casting material by using solder melting equipment, enabling the casting material to flow from the top end to the bottom end of the runner, and stopping pouring the casting material after the runner is full of the casting material;
(4) And after cooling, welding the edge of the corrosion-resistant welding plate with the inner wall of the tank body.
In the repairing method, the corrosion-resistant welding plates 3 are fixed in the corrosion area of the reboiler through the plug welding holes 31 and the flow channels 4, so that the number of the plug welding holes 31 can be reduced to a great extent, the size of the corrosion-resistant welding plates 3 can be increased, and the repairing can be completed by arranging a small number of the corrosion-resistant welding plates 3 in the large-area corrosion area, so that the repairing workload of the reboiler in the petrochemical field can be reduced to a great extent. In addition, the corrosion-resistant welding plate 3 is made of the same material as the inner wall of the reboiler, has good corrosion resistance, and greatly prolongs the service life of the repaired equipment by more than 2 inspection cycles, namely more than 6 years.
In the embodiment of the invention, the corrosion-resistant welding plate and the inner wall of the reboiler are welded after the existing welding melting, so long as the welding flux for welding the stainless steel material can be realized, and preferably, the low-temperature welding flux is selected.
It can be understood that the position of the plug welding hole 31 avoids the position of the runner 4, so as to prevent the two from interfering and affecting the plate repairing effect. Preferably, the plug welding holes 31 are uniformly distributed at the edge of the corrosion-resistant welding plate 3 and at the inner position of the corrosion-resistant welding plate 3, so as to ensure a good positioning effect, and also prevent the corrosion-resistant welding plate 3 from being deformed by heating when pouring materials, and the corrosion-resistant welding plate 3 can be tightly attached to the inner wall of a reboiler after repair is completed.
Further more, in the step (3), the runner is heated to 200-300 ℃ so that the casting material smoothly flows from the top to the bottom of the runner and the runner is filled with the casting material. Because the runner is longer and the radiating area is larger, keep the runner to have higher temperature in the pouring process, can guarantee that the watering material can flow to the other end smoothly from the one end of runner, and can be full of whole runner, realize fine welding effect, and the welding position is flawless to produce.
Before the step (2), polishing the corrosion area, performing electric welding filling on the corrosion pit with the depth of more than 4mm in the corrosion area, and polishing the protruded welding spots to be flat. The corrosion resistant welded plate 3 is bent to have the same arc as the inner wall of the reboiler.
It is understood that a plurality of corrosion-resistant welding plates are arranged according to the size of the corrosion area, and the edges of two adjacent corrosion-resistant welding plates are welded.
In order to improve the welding effect and enable the welding part to have no exceeding defect, in the step (3), after the pouring material fills the runner, the bottom end of the runner is cooled to a state that the pouring material seals the bottom end of the runner; and then pressurizing the casting materials in the runner at the top end of the runner, and if bubbles exist in the casting materials in the runner, rising the bubbles to the top end of the runner under the action of pressure. It can be understood that in the embodiment of the invention, based on the barrel-shaped inner wall of the reboiler, the runner is in a vertical arc shape, the top end of the runner is an inlet of the casting material, the bottom end of the runner is an outlet of the casting material, and when the top end of the runner is pressurized, the bottom end of the runner is plugged based on solidification of the casting material, and bubbles doped in the liquid casting material in the runner can rise to the top end of the runner under the action of pressure, so that the effect of removing the bubbles from the casting material in the runner is realized, and the welding part can have a good welding effect.
In order to prevent the casting material from overflowing the runner when the casting material in the runner is pressurized, the pressurizing pressure of the casting material is 0.1MPa, and a supporting mechanism is additionally arranged in the reboiler, the supporting mechanism 6 comprises a supporting rod and a supporting shoe positioned at the end part of the supporting rod, the supporting shoe is propped against the corrosion-resistant welding plate, the other end of the supporting rod is propped against the inner wall of the reboiler, and the supporting mechanism is used for enabling the corrosion-resistant welding plate to keep a state tightly attached to the inner wall of the reboiler so as to facilitate plug welding and pressurizing the casting material in the runner. It will be appreciated that the support means is installed after the corrosion resistant weld plate has been initially positioned on the inner wall of the reboiler, and then plug welding and welding with the casting material are performed, and the support means 6 is removed after the casting material in all of the channels has cooled and solidified.
Specifically, the solder melting equipment comprises a melting cavity 7 and a pressurizing mechanism 8, wherein a heating wire is wound on the outer wall of the melting cavity 7, an insulating layer 72 is coated on the outer part of the melting cavity 7, a discharging channel 71 is communicated with the bottom of the melting cavity 7, and the tail end of the discharging channel 71 is communicated with the top end of a flow channel; the pressurizing mechanism 8 is used for introducing inert gas into the melting cavity 7 so as to pressurize the melted casting material in the melting cavity 7 and further pressurize the casting material in the runner. Therefore, based on the fact that the melting cavity 7 is communicated with the runner, the casting material in the runner can be pressurized by pressurizing the casting material in the melting cavity 7, and the effects of simplifying construction difficulty and simplifying equipment mechanisms are achieved. In order to facilitate the pressurization of the high-temperature melting chamber 7, the pressurizing mechanism 8 comprises a pressurizing chamber and a ventilation pipeline communicated with the pressurizing chamber, so that the whole melting chamber is positioned in the pressurizing chamber, and inert gas is introduced into the pressurizing chamber through the ventilation pipeline, thereby realizing the pressurization of the melting chamber 7. The tail end of the blanking channel 71 is a square tube with gradually contracted width, the tail end of the blanking channel 71 can be inserted into the top end of the runner, and the outer wall of the blanking channel 71 can be propped against the inner wall of the runner, so that the overflow of the casting material can be prevented when the casting material is pressurized.
In order to improve the forming efficiency of the corrosion-resistant welding plate, in the step (1), plug welding holes are formed in the corrosion-resistant welding plate in a stamping forming mode; the corrosion-resistant welding plate is provided with a second groove in a stamping forming mode or a calendaring forming mode. At the same time, the first groove 23 is polished in the etched area using a polisher.
Further, the widths of the first groove and the second groove are 4-8mm; thus, the runner 4 with the width of 4-8mm can be formed, the fluidity of the casting material with enough width is better, and the deformation of the corrosion welding plate 3 can be prevented. It is further preferred that the width of the first groove 23 and the second groove 32 is 6-8mm.
In order to facilitate the processing of the first groove 23 on 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 the depth of the first groove 23 is easier to control. The depth of the second groove 32 is one third of the thickness of the corrosion-resistant welding plate 3, and the corrosion-resistant welding plate 3 still has enough thickness at the position of the runner 4, so that on one hand, the mechanical strength of the corrosion-resistant welding plate 3 can be ensured, and on the other hand, the corrosion-resistant welding plate 3 at the position of the runner has enough thickness, and the corrosion-resistant welding plate 3 cannot deform when the casting passes, so that a 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 welding plate 3 to have the same corrosion-resistant effect as the corrosion-resistant layer 2, the thickness of the corrosion-resistant welding plate 3 is 3-4mm; the material of the corrosion-resistant layer 2 and the corrosion-resistant welding plate 3 is stainless steel. Based on the consistent corrosion resistance effect of the two, the two have the same service life.
Further, the runner has a first gate 41 at the runner gate inlet and a second gate 42 at the runner gate outlet; the width of the first gate and the width of the second gate are both larger than the width of the runner, and the width of the first gate is 15-30mm. It will be appreciated that the gate is a wider opening at the inlet and outlet ends of the runner, and that the first gate 41 serves to facilitate connection of the runner to the solder melting apparatus and to facilitate pouring of the casting material into the runner.
Further, when the flow channel 4 is in a serpentine shape, a plurality of serpentine flow channels are arranged side by side, one end of each serpentine flow channel 4 is communicated with the first gate 41, and the other end of the serpentine flow channel 4 is communicated with the second gate 42; the width of the coverage area of each serpentine flow channel 4 is 5-10cm, and the distance between every two adjacent serpentine flow channels 4 is 10-20cm; plug welding holes 31 are arranged between two adjacent serpentine flow passages.
In other embodiments, as shown in fig. 6 and 7, the runner 4 is net-shaped, one end of the net-shaped runner 4 is provided with a first gate 41, and the other end of the net-shaped runner is provided with a second gate 42. The internal empty space of the net-shaped runner 4 is also provided with plug welding holes 31.
Based on the arrangement of the plug holes 31 and the flow passages 4 of the present embodiment, the corrosion-resistant welding plate 3 may have a relatively large size, and in some embodiments, the corrosion-resistant welding plate 3 has a width of 50-100cm and a length of 100-150cm. The welding plate with larger size can effectively reduce the repairing work intensity of the reboiler and improve the repairing efficiency of the reboiler. Preferably, the width of the corrosion-resistant welding plate 3 is 80-100cm, and the length is 120-150cm. The thickness of the corrosion-resistant layer is 3mm, and the thickness of the corrosion-resistant welding plate is 3-4mm; the material of the corrosion-resistant layer and the corrosion-resistant welding plate is stainless steel.
Further described, the reboiler tank defect repair method further comprises the step (5): and spraying a corrosion-resistant metal layer on the inner wall of the tank body with the corrosion-resistant welding plate by using a cold spraying process. The corrosion-resistant metal layer 5 can cover damage to the inner wall of the reboiler and the edge of the corrosion-resistant welding plate 3 caused by polishing. In addition, the surface of the corrosion-resistant welding plate 4 is not smooth enough due to the arrangement of the plug welding holes 31, the inner wall of the reboiler is smooth enough as a whole through the arrangement of the corrosion-resistant metal layer 5, and the joint of the corrosion-resistant welding plate 3 and the inner wall of the reboiler is smooth, so that the corrosion-resistant effect can be further improved. Optionally, the material of the corrosion-resistant metal layer is 022Cr17Ni12Mo2.
Preferably, the thickness of the corrosion-resistant metal layer 5 is 0.8-2mm. Further preferably, the thickness of the corrosion-resistant metal layer 5 is 1mm.
The technical principle of the present invention is described above in connection with the specific embodiments. The description is made for the purpose of illustrating the general principles of the invention and should not be taken in any way as limiting the scope of the invention. Other embodiments of the invention will occur to those skilled in the art from consideration of this specification without the exercise of inventive faculty, and such equivalent modifications and alternatives are intended to be included within the scope of the invention as defined in the claims.
Claims (8)
1. The method for repairing the defects of the reboiler tank body is characterized by comprising the 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 the corrosion pits are positioned on or penetrate through the corrosion-resistant layer;
the method comprises the following steps:
(1) A plug welding hole is formed in the corrosion-resistant welding plate, a first groove is formed in the corrosion area, a second groove is formed in one side face of the corrosion-resistant welding plate, and the second groove extends from one end of the corrosion-resistant welding plate to the other end of the corrosion-resistant welding plate;
(2) Positioning the corrosion-resistant welding plate in the corrosion area through the plug welding holes in a plug welding mode, and enabling the first groove and the second groove to be covered to form a flow passage, wherein the flow passage is in a serpentine shape or a net shape;
(3) Melting the solder into a casting material by using solder melting equipment, enabling the casting material to flow from the top end to the bottom end of the runner, and stopping pouring the casting material after the runner is full of the casting material;
(4) After cooling, welding the edge of the corrosion-resistant welding plate with the inner wall of the tank body;
in the step (3), the runner is heated to 200-300 ℃, so that the casting material flows from the top end to the bottom end of the runner and fills the runner with the casting material;
in the step (3), after the pouring material fills the runner, cooling the bottom end of the runner to a state that the pouring material seals the bottom end of the runner; and then pressurizing the casting materials in the runner at the top end of the runner, and if bubbles exist in the casting materials in the runner, rising the bubbles to the top end of the runner under the action of pressure.
2. The method for repairing the defects of the reboiler tank according to claim 1, wherein the solder melting equipment comprises a melting cavity and a pressurizing mechanism, a heating wire is wound on the outer wall of the melting cavity, a discharging channel is communicated with the bottom of the melting cavity, and the tail end of the discharging channel is communicated with the top end of the flow channel;
the pressurizing mechanism is used for introducing inert gas into the melting cavity so as to pressurize the melted casting material in the melting cavity and further pressurize the casting material in the runner.
3. The method for repairing a defect of a reboiler tank according to claim 1, wherein in the step (1), the plug welding holes are provided in the corrosion-resistant welding plate in a press forming manner;
and the second groove is formed in the corrosion-resistant welding plate in a stamping forming mode or a calendaring forming mode.
4. The reboiler tank defect repair method of claim 1, wherein the first tank and the second tank each have a width of 4-8mm;
the depth of the first groove is the same as the thickness of the corrosion-resistant layer, and the depth of the second groove is one third of the thickness of the corrosion-resistant welding plate.
5. The reboiler tank defect repair method of claim 1, wherein the sprue material inlet end of the runner is a first sprue and the sprue material outlet of the runner is a second sprue;
the width of the first gate and the width of the second gate are both larger than the width of the runner, and the width of the first gate is 15-30mm.
6. The method for repairing a defect of a reboiler tank according to claim 5, wherein when the flow passage is in a serpentine shape, the flow passage is a plurality of flow passages arranged side by side, 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 covering area of each serpentine flow channel is 5-10cm, and the distance between every two adjacent serpentine flow channels is 10-20cm;
the plug welding holes are arranged between the flow passages of two adjacent snakelike shapes.
7. The method for repairing a defect of a reboiler tank according to claim 5, wherein the corrosion-resistant welded plate has a width of 50-100cm and a length of 100-150cm;
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.
8. The reboiler tank defect repair method according to any one of claims 1 to 7, further comprising step (5): spraying a corrosion-resistant metal layer on the inner wall of the tank body with the corrosion-resistant welding plate by using a cold spraying process;
the thickness of the corrosion-resistant metal layer is 0.8-2mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210997387.7A CN115156839B (en) | 2022-08-19 | 2022-08-19 | Method for repairing defects of reboiler tank body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210997387.7A CN115156839B (en) | 2022-08-19 | 2022-08-19 | Method for repairing defects of reboiler tank body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115156839A CN115156839A (en) | 2022-10-11 |
| CN115156839B true CN115156839B (en) | 2023-12-19 |
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| CN112705906A (en) * | 2021-01-23 | 2021-04-27 | 中车洛阳机车有限公司 | Welding repair method for outer cylinder of preheating boiler |
| CN113210800A (en) * | 2021-04-30 | 2021-08-06 | 二重(镇江)重型装备有限责任公司 | Method for repairing defects of weld overlay on inner wall of PTA (pure terephthalic acid) reactor |
| CN114843660A (en) * | 2022-06-06 | 2022-08-02 | 重庆新铝时代科技股份有限公司 | Manufacturing process of new energy battery box based on extruded section |
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| EP1561536A1 (en) * | 2004-02-03 | 2005-08-10 | Siemens Aktiengesellschaft | Process of brazing repairing of a part having a base material with oriented microstructure |
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| US6267289B1 (en) * | 1996-03-21 | 2001-07-31 | Snamprogetti S.P.A. | Safety process for pressure equipment in contact with corrosive fluids |
| US6627292B1 (en) * | 1998-02-12 | 2003-09-30 | Pro Patch Systems, Inc. | Surface repair assembly including non-metallic repair patch |
| JP2001287062A (en) * | 2000-03-31 | 2001-10-16 | Toshiba Corp | Method of repairing with laser beam |
| CN101579773A (en) * | 2008-05-15 | 2009-11-18 | 中国石油天然气股份有限公司 | On-line repairing-welding technique for oil pipelines |
| CN105149597A (en) * | 2015-08-11 | 2015-12-16 | 利宝地工程有限公司 | Method for repairing or jointing metal or alloy part and repaired or jointed part |
| CN109702427A (en) * | 2019-01-25 | 2019-05-03 | 重庆工业职业技术学院 | A kind of tank body original composite layer corrosion location repair process method |
| CN112705906A (en) * | 2021-01-23 | 2021-04-27 | 中车洛阳机车有限公司 | Welding repair method for outer cylinder of preheating boiler |
| CN113210800A (en) * | 2021-04-30 | 2021-08-06 | 二重(镇江)重型装备有限责任公司 | Method for repairing defects of weld overlay on inner wall of PTA (pure terephthalic acid) reactor |
| CN114843660A (en) * | 2022-06-06 | 2022-08-02 | 重庆新铝时代科技股份有限公司 | Manufacturing process of new energy battery box based on extruded section |
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| CN115156839A (en) | 2022-10-11 |
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