CN110421236B - Welding repair method for furnace tube of reforming furnace for hydrogen production through service deterioration - Google Patents
Welding repair method for furnace tube of reforming furnace for hydrogen production through service deterioration Download PDFInfo
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- CN110421236B CN110421236B CN201910596153.XA CN201910596153A CN110421236B CN 110421236 B CN110421236 B CN 110421236B CN 201910596153 A CN201910596153 A CN 201910596153A CN 110421236 B CN110421236 B CN 110421236B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/04—Welding for other purposes than joining, e.g. built-up welding
- B23K9/042—Built-up welding on planar surfaces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
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Abstract
The invention belongs to the technical field of hydrogen production reformer furnace tube repair, and discloses a method for welding and repairing a service deteriorated hydrogen production reformer furnace tube, which comprises the steps of firstly, carrying out tissue damage inspection on the service deteriorated hydrogen production reformer furnace tube, and determining that only tissue transformation occurs in the furnace tube and microcracks do not exist; then, processing the furnace tube into a V-shaped groove in the circumferential direction, and performing heat treatment on the groove by using electric arc; removing a heat treatment layer formed on the surface of a part of the groove, and performing surfacing treatment on the groove by using a nickel-based welding wire; and finally removing the surfacing layer formed on the surface of part of the groove, and welding the groove by using a welding wire which is the same as that of the furnace tube. The welding repair method for the furnace tube of the service degradation hydrogen production reformer provided by the invention enables the microstructure of the furnace tube of the service degradation hydrogen production reformer to be transformed again, avoids welding hot cracks in the welding repair process, and improves the welding repair quality.
Description
Technical Field
The invention belongs to the technical field of hydrogen production reformer furnace tube repair, and particularly relates to a welding repair method for a service deteriorated hydrogen production reformer furnace tube.
Background
With the continuous improvement of the national requirements for environmental protection, the hydrogen production process is widely applied to the petrochemical industry. The petrochemical hydrogen producing process is mainly that light hydrocarbon reacts with water vapor under high temperature, high pressure and catalytic condition to finally produce H2And CO2The reaction is mainly carried out in a hydrogen production reformer tube. The design life of the furnace tube of the hydrogen production reforming furnace is 10^5h usually, however, the change of a plurality of factors such as pressure, temperature and the like brings adverse effects, and the furnace tube can be damaged in various forms before the life cycle is reached. In the repair process of the furnace tube, a method of directly replacing the whole or part of the tube section is mostly adopted. However, due to the fact that the deteriorated furnace tube in service has tissue transformation, the plasticity and the high-temperature performance are seriously reduced, the difference with the new furnace tube in tissue and performance is obvious, welding cracks are easily generated during direct welding, primary repair failure is easily caused, secondary or even tertiary repair has to be carried out, and the repair working time cost and the economic cost are greatly increased. Therefore, in order to avoid welding cracks during welding repair of the furnace tube of the reforming furnace for the hydrogen production from service deterioration, how to perform the pre-welding treatment to improve the repair quality becomes an urgent problem to be solved.
Disclosure of Invention
The invention aims to solve the technical problem that welding cracks are easy to appear during welding repair of a furnace tube of a service degradation hydrogen production reformer, and provides a welding repair method of the service degradation hydrogen production reformer.
In order to solve the technical problems, the invention is realized by the following technical scheme:
a method for welding and repairing a furnace tube of a reforming furnace for hydrogen production by deterioration in service is suitable for the condition that only tissue transformation occurs in the interior of the furnace tube and microcracks do not exist; and the method comprises the following steps:
(1) processing the furnace tube into a V-shaped groove in the circumferential direction, and performing surface remelting heat treatment on the groove by using electric arc;
(2) removing part of the surface remelting heat treatment layer formed on the surface of the groove, and performing surfacing treatment on the groove by using a nickel-based welding wire;
(3) and removing part of the surfacing layer formed on the surface of the groove, and welding the groove by using a welding wire which is the same as the furnace tube.
Further, the angle of the V-shaped groove in the step (1) is 60-70 degrees.
Further, the arc in the step (1) is a non-consumable electrode inert gas protective arc.
Further, the electric arc in the step (1) is argon tungsten arc.
Further, the processing times of the surface remelting heat treatment in the step (1) are 5-10 times.
Further, the thickness of the surface remelting heat treatment layer removed in the step (2) is 0.5-1 mm.
Further, the surfacing treatment method in the step (2) is non-metal inert gas shielded arc welding with a welding wire number ERNiCr-3.
Further, the thickness of the overlaying layer removed in the step (3) is 0.8-1.2 mm.
Further, the welding method in the step (3) is non-metal inert gas arc welding, and the welding wire is H4Cr25Ni35 Nb.
The invention has the beneficial effects that:
the invention provides a welding repair method for a furnace tube of a hydrogen production reformer with service deterioration, which can firstly dissolve coarse precipitates at a certain depth from the surface of a part to be repaired to change the microstructure shape and distribution, and secondly can repair the welded heat affected zone part finally by a surfacing layer obtained by surfacing treatment, thereby greatly improving the local welding performance of the furnace tube with material deterioration and ensuring that no welding heat crack occurs in the subsequent welding repair process.
Drawings
FIG. 1 is an axial cross-sectional view of the surface remelting treatment in an example;
FIG. 2 is an axial cross-sectional view of a weld overlay process in an embodiment;
FIG. 3 is an axial cross-sectional view of a weld joint in an embodiment.
In the above figures: 1-furnace tube; 2-beveling; 3-remelting a heat treatment layer on the surface; 4-overlaying layer.
Detailed Description
In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings:
the method firstly observes and analyzes the microstructure of the furnace tube of the converter for the hydrogen production by deterioration in service, and determines that the deteriorated furnace tube 1 only has the transformation of the tissue type and the form distribution and does not generate microcracks and the like. Determining the microstructure form and distribution of the furnace tube 1 of the in-service deteriorated hydrogen production reformer through an optical microscope or a scanning electron microscope.
The microstructure damage detection of the furnace tube 1 is necessary work before the repair of the furnace tube 1, if the damage degree of the microstructure of the furnace tube 1 is high, creep holes or microcracks appear, and the part can not be repaired by welding; if the furnace tube 1 only has tissue transformation, the method of the invention is needed to be utilized to carry out tissue recovery and performance improvement, and weld repair is smoothly completed.
Firstly, a furnace tube 1 is processed into a V-shaped groove 2 in the circumferential direction, and the angle of the V-shaped groove 2 is preferably 60-70 degrees, so that the back can be melted through during welding. And then carrying out surface remelting heat treatment on the groove 2 for 5-10 times by using argon tungsten-arc to form a 1-2 mm heat-treated fine grain region. The arc of the surface remelting heat treatment is a non-consumable electrode inert gas protection arc, the polarity of a power supply is a direct current positive polarity, the non-consumable electrode is a tungsten electrode, the diameter phi is 3.0mm, the inert protection gas is argon, the flow of the protection gas is 10-15L/min, the arc current is 80-140A, the arc voltage is 11-14V, and the heat treatment speed is 6-10 cm/min.
And secondly, removing a part of the surface remelting heat treatment layer 3 formed on the surface of the groove 2, wherein the thickness of the removed surface remelting heat treatment layer 3 is generally 0.5-1 mm, and the thickness can ensure that the groove 2 is cleaned while a remelting fine grain region is reserved. And then, the nickel-based welding wire is used for carrying out surfacing treatment on the groove 3, so that the damage and the deficiency of the material performance of the furnace tube 1 can be made up, and on the other hand, the surfacing layer 4 serving as a transition part of formal welding can greatly reduce the hot cracking tendency of the near seam region of the furnace tube 1. The specific method of the surfacing welding treatment comprises the steps of adopting non-consumable electrode inert gas shielded arc welding, wherein the welding polarity is direct current positive polarity, the non-consumable electrode is a tungsten electrode, the diameter phi is 3.0mm, the inert protective gas is argon, the protective gas flow is 10-15L/min, the welding wire is ERNiCr-3, the welding wire specification phi is 2.4mm, the welding current is 90-120A, the arc voltage is 10-14V, and the welding speed is 5-9 cm/min.
And thirdly, removing a part of the surfacing layer 4 formed on the surface of the groove 2, wherein the thickness of the removed surfacing layer 4 is generally 0.8-1.2 mm, and the thickness can ensure that the groove 2 is cleaned while the transition area of the nickel-based welding material is kept. And then welding the groove 2 by using an H4Cr25Ni35Nb welding wire which is the same as that of the furnace tube 1 through argon tungsten-arc welding, so that a well-formed welding joint can be obtained. The welding polarity is direct current positive polarity, the protective gas flow is 10-15L/min, the welding wire specification is phi 2.0mm, the welding current is 90-120A, the arc voltage is 10-14V, and the welding speed is 5-9 cm/min.
The operation process and effect of the method for repairing the welding of the furnace tube of the reforming furnace for the hydrogen production from deterioration in service provided by the invention are further illustrated by the following test example: the material of the hydrogen production converter tube 1 of a petrochemical enterprise which is normally in service for about 7 years is HP40Nb, and the welding repair process is as follows:
After welding, the result of structure detection shows that coarse carbides on the austenite grain boundary of the furnace tube with service deterioration are refined, and the material performance meets the use requirement.
Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and those skilled in the art can make various changes and modifications within the spirit and scope of the present invention without departing from the spirit and scope of the appended claims.
Claims (6)
1. A method for welding and repairing a furnace tube of a reforming furnace for hydrogen production through service deterioration is characterized in that the method is suitable for the condition that only tissue transformation occurs in the interior of the furnace tube and microcracks do not exist; and the method comprises the following steps:
(1) processing the furnace tube into a V-shaped groove in the circumferential direction, and performing surface remelting heat treatment on the groove for 5-10 times by using argon tungsten-arc to form a 1-2 mm heat-treated fine grain region;
(2) removing part of the surface remelting heat treatment layer formed on the surface of the groove, and performing surfacing treatment on the groove by using a nickel-based welding wire;
(3) and removing part of the surfacing layer formed on the surface of the groove, and welding the groove by using a welding wire which is the same as the furnace tube.
2. The welding repair method for the furnace tube of the hydrogen production reformer furnace in service deterioration according to claim 1, wherein the angle of the V-shaped groove in the step (1) is 60-70 °.
3. The welding repair method for the furnace tube of the reforming furnace for the hydrogen production deteriorated in service, according to claim 1, wherein the thickness of the surface remelting heat treatment layer removed in the step (2) is 0.5-1 mm.
4. The method for repairing the furnace tube of the reforming furnace for the hydrogen production through service deterioration according to claim 1, wherein the surfacing treatment method in the step (2) is non-metal inert gas arc welding with a welding wire mark ERNiCr-3.
5. The welding repair method for the furnace tube of the service degradation hydrogen production reformer according to claim 1, wherein the thickness of the overlay removed in the step (3) is 0.8-1.2 mm.
6. The welding repair method for the furnace tube of the hydrogen production reformer deteriorated in service as claimed in claim 1, wherein the welding method in the step (3) is non-metal inert gas arc welding with a welding wire designation of H4Cr25Ni35 Nb.
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| CN112846562A (en) * | 2020-12-31 | 2021-05-28 | 东方电气(广州)重型机器有限公司 | Welding seam structure, shell assembly and shell assembly manufacturing method |
| CN114433982A (en) * | 2022-02-23 | 2022-05-06 | 鲁西工业装备有限公司 | Welding process for high-temperature cast steel furnace tube |
| CN115008049A (en) * | 2022-04-28 | 2022-09-06 | 广船国际有限公司 | Welding method of large-gap ultra-thick plate and container |
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| CN2796823Y (en) * | 2005-04-18 | 2006-07-19 | 王德瑞 | Furnace tube of heat exchange type convertor |
| JP4690156B2 (en) * | 2005-09-15 | 2011-06-01 | 福田金属箔粉工業株式会社 | Ni brazing alloy |
| CN102764937A (en) * | 2011-05-06 | 2012-11-07 | 浦杰 | Welding production line of alloy furnace tube and tube bundle |
| JP2017061748A (en) * | 2015-09-25 | 2017-03-30 | 日新製鋼株式会社 | Ferritic stainless steel for tube |
| CN207102559U (en) * | 2017-04-14 | 2018-03-16 | 中国石油化工股份有限公司 | Burn formula hydrogen manufacturing conversion furnace in a kind of bottom based on double tube reactor |
| CN207091476U (en) * | 2017-08-19 | 2018-03-13 | 江苏标新工业有限公司 | A kind of special-shaped boiler tube annealing device |
| CN108127218A (en) * | 2017-12-13 | 2018-06-08 | 合肥通用机械研究院 | Ethylene cracking tube welding repair method after a kind of military service |
| CN208703352U (en) * | 2018-08-31 | 2019-04-05 | 大连环新精密特钢股份有限公司 | Heat-treatment furnace pipe connection |
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