CN106112383B - A kind of high temperature superheater imports and exports header restorative procedure - Google Patents
A kind of high temperature superheater imports and exports header restorative procedure Download PDFInfo
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- CN106112383B CN106112383B CN201610706185.7A CN201610706185A CN106112383B CN 106112383 B CN106112383 B CN 106112383B CN 201610706185 A CN201610706185 A CN 201610706185A CN 106112383 B CN106112383 B CN 106112383B
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- China
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- header
- branch pipe
- bending
- connecting tube
- tube body
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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
- B23P6/04—Repairing fractures or cracked metal parts or products, e.g. castings
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
A kind of restorative procedure of high temperature superheater inlet and outlet header, belongs to field of thermal power, includes the following steps：1st, the 4th branch pipe is cut off from header root to branch pipe straight line portion；2nd, welding bore is made in header；3rd, connecting tube is replaced；4th, connecting tube is welded between header and branch pipe remainder；5th, the part that butt welding is taken over carries out burning optimization on line；The connecting tube, including tube body, the first bending, the second bending, third bending, step；With that can overcome since high temperature superheater imports and exports the 4th branch pipe of header since curvature not enough generates the defects of stress be easy to cause bead crack, the characteristics of header works normally ensure that.
Description
Technical field
The invention belongs to steam power plant field, more particularly to a kind of thermal power plant steam boiler high temperature superheater into
Outlet header restorative procedure.
Background technology
In thermal power generation corporations, it is the steam that water heating is become to high temperature and pressure by steam boiler combust fuel, pushes away
Dynamic steam turbine rotation, drives what generator generated electricity；In the application of steam, in order to ensure that steam is unlikely to produce in application
Raw excessive moisture, often keeps the condition of high temperature of steam, enters header, be redistributed in each lateral, in favor of
The reasonable application of steam；It is largely many small using being distributed around header in existing high temperature superheater imports and exports header
Pipe, superheater steam pressure 13.7MPa, wherein 540 °C of temperature, the material of high temperature superheater header are 12Cr1MoV, commonly use rule
Lattice be 325 millimeters of diameter, 50 millimeters of wall thickness, and the material of branched pipe be 12Cr1MoV, specification be 42 millimeters of diameter, wall thickness 5.5
Millimeter, proves by working practice, finds often occur from single 4th tube socket inwards of high temperature superheater outlet header tube socket
Root is cracked, and by repairing repeatedly, this root branch pipe is easily damaged centrostigma as high temperature superheater outlet header.
Invention content
For in the 4th flimsy phenomenon of tube capacity of thermal power plant high temperature superheater outlet header, the present inventor carries out
Conscientiously study, find out the reason is that the 4th branch pipe due to position limits and it is inadequate curvature occur, the when causing to expand with heat and contract with cold
Four branch pipes and stress at header welding are excessive, crack, and the method used during reparation is inappropriate, and therefore, the present invention carries
Go out a kind of restorative procedure of high temperature superheater inlet and outlet header, it is characterised in that：Include the following steps：1st, by the 4th branch pipe from
Header root is cut off to branch pipe straight line portion；2nd, welding bore is made in header；3rd, connecting tube is replaced；4th, connecting tube is welded
To between header and branch pipe remainder；5th, the part that butt welding is taken over carries out burning optimization on line；The step 1 is using tool
Interface is had to the branch pipe of crackle, is cut off at header, then cuts the other end of branch pipe from the straight line portion of the 4th branch pipe
It is disconnected, and remove；The step 2 is that the butt hole of branched pipe is re-worked at the 4th branch tube socket of original header；Institute
The step 3 stated is by the part of the 4th branch pipe of removal, is replaced using the connecting tube of new construction；The step 4 is
Between branch holder and remaining 4th branch pipe that the connecting tube of new construction is welded in header；The step 5 is will to connect
Pipe is heat-treated with header and original 4th branch pipe straight line portion weld and near zone, to eliminate stress.
The welding bore is arranged on original 4th branch pipe of header at header welding, being step type hole, including
Through-hole, platform, reaming；The through-hole and header internal run-through；The platform is vertical with through-hole, is round and same with through-hole
The heart；The reaming is arranged on platform, concentric with through-hole；Wherein a diameter of 65mm of reaming, hole depth 4-5mm.
The connecting tube, including tube body, the first bending, the second bending, third bending, step；The tube body material
It is identical with original 4th branch pipe with diameter and wall thickness；First bending part is arranged on tube body top, curved to second
The lateral distance of bent portions is not less than 50 millimeters；Described second is arranged in a curve way the middle part of tube body, second bending section
For the length divided not less than 300 millimeters, transverse curvature is not less than 50 millimeters；The third is arranged in a curve way the lower part of tube body；Institute
The step stated is arranged on tube body both ends, and the outer dia of step part is more than 1-2 millimeters of tube body outer dia.
Burning optimization on line in the step 5 is using electrical heating elements, by the header and branch near weld seam and weld seam
Pipe wraps up, and carries out temperature and time control to its heating temperature using temperature controller；Electrical heating elements therein are heating
Rope；The heating rope includes heating wire, asbestos cord；The heating wire is wrapped among asbestos cord, and both ends connect with power supply
It is logical；The asbestos cord is swathed in the outside of heating wire, ensures that heating wire is wrapped completely without exposed, formation flexible heater rope.
The welding parameter is：Butt weld is using complete manual argon welding weldering welding；Welding current 110-120A；Branch pipe pipe
Row imports and exports header welding with high temperature superheater, using plug-in type, fillet weld first layer bottom argon arc welding welding method, single side
Weld double-faced forming, welding current 110-125A, second and third layer R317 welding rods, Ф 3.2mm；Second layer electric current 105-110A, the
Three layers of electric current 108-1103A；The use of welding machine is ZX7-400S, striking mode is high-frequency arc strike, argon arc welding 160 type of model,
Torch nozzle a diameter of Ф 10mm, argon flow amount 8-10ml, argon arc welding electrode use cerium crow pole stick as Ф 2.5mm, welding wire type
Number be R31, gage of wire 2.5mm.
The heat treatment parameter is：Heat treatment is using high tempering；730 ± 10 DEG C of temperature, warming and cooling rates:
125℃/h；Constant temperature time：210 minutes;In temperature-fall period, temperature can not control below 300 DEG C；Overall process automatically dotting is remembered
Record.
Advantageous effect
The beneficial effects of the present invention are can overcome since high temperature superheater imports and exports the 4th branch pipe of header due to song
Degree not enough generates the defects of stress be easy to cause bead crack, ensure that header works normally.
Description of the drawings
Fig. 1 is the branch pipe connection diagram of existing high temperature superheater inlet and outlet header
1. header, 2. first branch pipes, 3. second branch pipes, 4. third branch pipes, 6. the 4th branch pipes.
Fig. 2 is the branch pipe connection diagram of the high temperature superheater inlet and outlet header after repairing
1. header, 2. first branch pipes, 3. second branch pipes, 4. third branch pipes, 5. connecting tubes, 6. the 4th branch pipes.
Fig. 3 is the structure diagram of connecting tube
51. tube body, 52. first bendings, 53. second bendings, the bending of 54. thirds, 55. steps.
Fig. 4 is the structure diagram of tube socket in header
1. header, 11. through-holes, 12. platforms, 13. reamings.
Fig. 5 is the structure diagram of heating rope
71. heating wire, 72. asbestos cords.
Fig. 6 is the temperature profile of burning optimization on line after welding
Wherein abscissa is time coordinate, and ordinate is temperature coordinate.
Specific embodiment
Technical solution in order to further illustrate the present invention, the specific embodiment party further illustrated the present invention in conjunction with attached drawing
Formula, such as Fig. 3, with WGZ670/13.7-12 type boilers, evaporation capacity 670t/h, superheater steam pressure in this example
13.7MPa for the mating high temperature superheater inlet and outlet header of 540 DEG C of temperature, selects 42 millimeters of diameter, wall thickness in this example
5.5 millimeters, material 12Cr1MoV, steel pipe as tube body 51, the distances for selecting the first bending 52 to 51 upper end of tube body are 150
Millimeter, the lateral distance to the second bending 53 are 80 millimeters, and 200 millimeters of fore-and-aft distance selects the second bending 53 to be bent to third
54 lateral distance is 80 millimeters, and fore-and-aft distance is 200 millimeters, and the distance for selecting third bending 54 to 51 lower end of tube body is 150
Millimeter, the step 55 of a diameter of 20 millimeters of 41 mm length is processed at 51 both ends of tube body, just completes the implementation of connecting tube 5；
As a result of three crooked positions, extendable room of the 4th branch pipe 6 when expanding with heat and contract with cold is increased, stress is disappeared by these bendings
Consumption, without the commissure being concentrated between the 4th branch pipe 6 and header 1, also just reduces the probability that the weld seam cracks, subtracts
Header is lacked and has repaired number, improved work efficiency.
It is selected such as Fig. 4, in this example for 6 a diameter of 42 millimeters of pipe of the 4th branch pipe, it is through-hole 11 to select tube socket structure
30 millimeters of diameter, 65 mm depth of diameter of reaming 13 is 5 millimeters, and reaming 13 and through-hole 11 are concentric, reaming 13 and through-hole 11
Intersection forms platform 12, this completes the implementation of tube socket in header 1, as a result of reaming 13 and platform 12 so that
Welding space even uniform between 4th branch pipe 6 and header 1 ensure that weld strength and stress are uniform.
Such as Fig. 5, selected in this example commercially available electric blanket by the use of heating wire as heating wire 71, select 4-5 millimeters of diameter
Asbestos cord 72 is closely uniformly wrapped in the outside of heating wire 71 as asbestos cord 72 by asbestos cord, forms the implementation of heating rope,
Due to the spatial complex between branch pipe and header 1, the covering of different zones can be preferably adapted to using heating rope, heating is equal
It is even；As a result of heating wire 71 as heat source, heating curves and heating temperature can be easily controlled.
Such as Fig. 2, with WGZ670/13.7-12 type boilers, evaporation capacity 670t/h, superheater steam pressure in this example
13.7MPa, for the mating high temperature superheater inlet and outlet header of 540 DEG C of temperature, by the 4th branch pipe 6 from root resection length
700 millimeters, the nozzle of remaining 4th branch pipe 6 is made into groove in favor of welding, by the junction of the 4th branch pipe 6 in header 1
Tube socket, produce aforementioned structure and shape, 5 one end of connecting tube be aligned with the platform 12 that tube socket is and concentric with through-hole 11,
The other end of connecting tube 5 with the nozzle of 6 remainder of the 4th branch pipe is docked, is welded, butt weld is using complete manual argon
Weldering weldering welding；Welding current 110-120A；Branch pipe pipe is arranged imports and exports header welding with high temperature superheater, using plug-in type, fillet welding
Stitch first layer bottom argon arc welding welding method, single face welding and double face shaping, welding current 110-125A, second and third layer R317
Welding rod, Ф 3.2mm；Second layer electric current 105-110A, third layer electric current 108-1103A；Using welding machine be ZX7-400S, striking side
Formula is high-frequency arc strike, and argon arc welding is 160 type of model, torch nozzle a diameter of Ф 10mm, argon flow amount 8-10ml, argon arc welding
Electrode uses cerium crow pole stick as Ф 2.5mm, welding wire model R31, gage of wire 2.5mm；It can ensure that weld seam is heated in this way
Uniformly, it is connected firmly.
Such as Fig. 6, heating is restricted and is respectively wound around the outside of 1 and the 4th branch pipe 6 of header and connecting tube 5, powers on and controls
Device processed carries out burning optimization on line using high tempering；730 ± 10 DEG C of temperature, warming and cooling rates: 125℃/h；Constant temperature
Time：210 minutes;In temperature-fall period, temperature can not control below 300 DEG C；Overall process automatically dotting records, thus complete
Into elimination welding stress, ensure the work of welding quality.It was verified that the 4th branch pipe 6 after the method is repaired, does not have
Occurred the defects of similar weld cracking again.
Claims (1)
1. a kind of restorative procedure of high temperature superheater inlet and outlet header, includes the following steps：1st, by the 4th branch pipe from header root
Portion is cut off to branch pipe straight line portion；2nd, welding bore is made in header；3rd, connecting tube is replaced；4th, connecting tube is welded to header
Between branch pipe remainder；5th, the part that butt welding is taken over carries out burning optimization on line；The step 1 is to use tool by interface
There is the branch pipe of crackle at place, is cut off at header, then cuts off the other end of branch pipe, and take from the straight line portion of the 4th branch pipe
Under；The step 2 is that the butt hole of branched pipe is re-worked at the 4th branch tube socket of original header；The step
Rapid 3 be by the part of the 4th branch pipe of removal, is replaced using the connecting tube of new construction；The step 4 is by new knot
The connecting tube of structure is welded between the tube socket in header and remaining 4th branch pipe；The step 5 is by connecting tube and header
It is heat-treated with original 4th branch pipe straight line portion weld and near zone, to eliminate stress；It is characterized in that：It is described
Connecting tube, including tube body, the first bending, the second bending, third bending, step；The tube body material and diameter and wall thickness
It is identical with original 4th branch pipe；First bending part is arranged on tube body top, to the transverse direction of the second bending part
Distance is not less than 50 millimeters；Described second is arranged in a curve way the middle part of tube body, and the length of second bending part is not small
In 300 millimeters, transverse curvature is not less than 50 millimeters；The third is arranged in a curve way the lower part of tube body；The step setting
At tube body both ends, the outer dia of step part is more than 1-2 millimeters of tube body outer dia.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610706185.7A CN106112383B (en) | 2016-08-23 | 2016-08-23 | A kind of high temperature superheater imports and exports header restorative procedure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610706185.7A CN106112383B (en) | 2016-08-23 | 2016-08-23 | A kind of high temperature superheater imports and exports header restorative procedure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106112383A CN106112383A (en) | 2016-11-16 |
| CN106112383B true CN106112383B (en) | 2018-07-10 |
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ID=57274017
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610706185.7A Expired - Fee Related CN106112383B (en) | 2016-08-23 | 2016-08-23 | A kind of high temperature superheater imports and exports header restorative procedure |
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| Country | Link |
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| CN (1) | CN106112383B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4687894A (en) * | 1985-05-29 | 1987-08-18 | Daiichi Koshuha Kogyo Kabushiki Kaisha | Induction heating method and apparatus for relieving residual stress in welded joints in pipe line |
| EP0477066A1 (en) * | 1990-09-19 | 1992-03-25 | Framatome | Method of replacing a tube of a heat exchanger and application of this method |
| CN202549158U (en) * | 2012-03-14 | 2012-11-21 | 中国神华能源股份有限公司 | Weld holder |
| CN103170712A (en) * | 2013-03-29 | 2013-06-26 | 东方电气集团东方锅炉股份有限公司 | Tube socket fillet weld reheat crack prevention method |
| CN104789749A (en) * | 2015-03-31 | 2015-07-22 | 中国神华能源股份有限公司 | Method for heat treatment of welded joint in tube panel |
-
2016
- 2016-08-23 CN CN201610706185.7A patent/CN106112383B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4687894A (en) * | 1985-05-29 | 1987-08-18 | Daiichi Koshuha Kogyo Kabushiki Kaisha | Induction heating method and apparatus for relieving residual stress in welded joints in pipe line |
| EP0477066A1 (en) * | 1990-09-19 | 1992-03-25 | Framatome | Method of replacing a tube of a heat exchanger and application of this method |
| CN202549158U (en) * | 2012-03-14 | 2012-11-21 | 中国神华能源股份有限公司 | Weld holder |
| CN103170712A (en) * | 2013-03-29 | 2013-06-26 | 东方电气集团东方锅炉股份有限公司 | Tube socket fillet weld reheat crack prevention method |
| CN104789749A (en) * | 2015-03-31 | 2015-07-22 | 中国神华能源股份有限公司 | Method for heat treatment of welded joint in tube panel |
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| Publication number | Publication date |
|---|---|
| CN106112383A (en) | 2016-11-16 |
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Granted publication date: 20180710 Termination date: 20190823 |