CN109807432A - Large thick-wall low temperature nickel alloy steel equipment group is to welding method - Google Patents
Large thick-wall low temperature nickel alloy steel equipment group is to welding method Download PDFInfo
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Abstract
The invention discloses large thick-wall low temperature nickel alloy steel equipment groups to welding method; for project narrow field; the equipment that cylinder wall thickness is thicker, diameter is big; 5 sections of tower point is prefabricated; using the sleeping dress of first segment and second segment tower body, remaining 3 closes up the aerial welding of circumferential weld, and the attached ladder of every section of tower body, platform are installed before lifting; it solves the highly difficult work of large-scale scrubbing tower high altitude operation, improves working efficiency；Verticality bidirectional measurement technology is used when tower body vertically lifts, while group measures tower body verticality using 2 theodolites, improves squareness measurement accuracy, improves installation speed；Continuous welding is synchronized using more people are symmetrical, reduces welding preheating and rear heat treatment number, effectively control welding deformation, it is ensured that quality of weld joint；Using TOFD+MT detection method, achieve the purpose that efficiently, have record.
Description
Technical field
The invention belongs to special installation welding fields, and in particular to a kind of large thick-wall low temperature nickel alloy steel equipment group butt welding
Connect method.
Background technique
Low-temp methanol washing process is the commonly used desulfurization and decarburization technique of large chemical complex, this set technique and other acidity
Gas purifying technique is compared to having the characteristics that selectivity is good, degree of purification is high, energy consumption and operating cost are low, so that low-temp methanol washs
Tower demand is continuously increased.And low-temp methanol scrubbing tower is then the core equipment of low-temp methanol washing process.The equipment is overweight, superelevation
And it is related to the welding of low temperature nickel alloy steel steel, it is the key equipment for influencing chemical company's construction.
Such as low temperature washing device for methanol area scrubbing tower always weighs about 711 tons in 450,000 tons/year of synthesis ammonia projects, specification
For 3800*84355mm, narrow field in project, scrubbing tower cylinder wall thickness is thicker (δ=90mm), and diameter is big, equipment weight, the tower point
5 sections prefabricated (contain skirt), equipment material is low temperature nickel alloy steel, the limitation of heat-treated capacity of equipment and on-site hoisting ability,
Difficulty of construction is big, therefore researches and develops to large-scale scrubbing tower hoisting, and especially the lifting of the tower body and welding technique need to improve.
Summary of the invention
To solve the above problems, the invention discloses large thick-wall low temperature nickel alloy steel equipment groups to welding method, use
The sleeping dress of skirt (first segment) and second segment tower body, remaining 3 closes up the aerial welding of circumferential weld, according to nozzle orientation in every section of tower
Body segmentation port outer surface carry out 0 °, 90 °, 180 °, 270 ° of four heart line positions carry out mark, and spot welding field assembly work
Dress using verticality bidirectional measurement, while using 2 theodolite bidirectional measurements, and correction in time in place, is saved the lifting time, taken
Obtain good economic benefit.
In order to achieve the above objectives, technical scheme is as follows:
Large thick-wall low temperature nickel alloy steel equipment group is to welding method, comprising the following steps:
(1) before equipment installation, the pitted skin of grouting is shoveled, places and is evened out at parallels, reserves the sundries in anchor (bolt) hole
It cleans out；
(2) tower body is divided into 5 sections, carries out pedestal production, and the attached ladder of each section of side of welding according to tower body diameter；
(3) each section of tower body is sleeping when putting, according to equipment nozzle orientation every section of tower body segmentation port lateral surface carry out 0 °, 90 °,
180 °, 270 ° of four heart line positions carry out mark,
(4) two sections of tower bodies and skirt (one section) lie in ground and welding are grouped,
A: being welded, heat < 25KJ thermal weld stress using manual electric arc welding,
B: using double V groove form, and it is 55 ± 3 ° that bevel angle, which increases,
C: weld preheating, more symmetrical synchronous weldings of people, strict control interlayer temperature, welding as discontinuous as possible, interlayer temperature are answered
Control is at 100 ~ 200 DEG C；
(5) the tower body on-site hoisting after the completion of welding is holded up to come, two-way squareness measurement is used in hoisting process, is used simultaneously
2 theodolite bidirectional measurements correct in place, mounting seat in time；
(6) two sections of tower bodies weld place's adjunct platform with tower body group with three sections of tower body groups,
(7) three sections of tower bodies are lifted by crane and carry out aerial group pair, using the luffing of crane, rotating mechanism, third section tower body are adjusted to pacify
After holding position, adjusted with gantry snap-gauge and jack to two sections of tower bodies；Then using the vertical of theodolite testing tower body
Degree is detected tower body alignment clearance, unfitness of butt, and is checked nozzle orientation using leveling ruler, steel tape, and testing result meets design
After it is required that, tack welding is carried out；
(8) four sections of tower body, five sections of lifting, welding are successively carried out according to step (7) technique；
(9) the non-destructive testing technology of tower body weld seam
To guarantee surrounding people's personal safety, using TOFD+MT detection method, all weld seams carry out TOFD ultrasound examination,
It asks and meets II grades of qualifications in NB/T47013.10-2015, B grades of industrial grade；100% Magnetic testing (MT) is carried out again, meets NB/
I grades of qualifications in T47013.4-2015；
(10) local post weld heat treatment technique
Stress relief annealing is carried out using thermocouple heating means；
The quantity of thermocouple and position: circumferential weld outer wall circumferentially each at least 8 thermocouples；Tower tray support or platform, ladder and shell
1 thermocouple of each heating zone cloth of weld seam that internal outer wall mutually welds simultaneously is located at heating district center；
(11) postwelding polishing cleaning weld bond
Postwelding Welded Joints surface is polished, and surface defect is cleared up.
Further, the attached ladder spiral of step (3) each section of side is upward.
Further, step (3) is identified using white paint.
Further, step (4) preheating must uniformly, preheating temperature >=150 DEG C, and heat range is that weld seam two sides are not respectively small
In 3 times of weldment thickness；Preheating temperature should be no less than six away from symmetrical measurement at axis of a weld 50mm, every weld seam temperature measuring point
It is right.
Further, after the completion of step (7) welding, weather proof is built within the scope of 1.5 meters on the weld seam of cylinder medial and lateral and is set
It applies and lightning protection device, working shed should be laid with asbestic blanket.
Further, step (10) is heat-treated heated perimeter:
A) shell group is that the every side of maximum weld width+weld seam is no less than 150 mm's outward from edge to the heated perimeter of circumferential weld
Region, interior external heat；
B) fillet weld heater around the whole circle arrangement of cylinder or is arranged symmetrically between tower tray support and shell, and heated perimeter is maximum weldering
Slit width degree+from the every side of maximum width joint edge genesis or every end is respectively no less than 50mm, interior external heat；
Be heat-treated heat-preserving range: heater coverage area+every side of self-heating band edge genesis or every end are respectively no less than 400mm and many
In 2 times of width of heating, interior external thermal insulation, all pipe connecting flanges should be wrapped up integrally and be filled in stifled tight in heat-treatment zone；Keep the temperature thickness
Degree: no less than 70mm.
The beneficial effects of the present invention are:
1, it is directed to project narrow field, cylinder wall thickness is compared with thick, diameter is big, the special circumstances of equipment weight, this engineering method is by 5 sections of the tower point
Prefabricated (contain skirt), using skirt (one section) and the sleeping dress of second segment tower body, remaining 3 closes up the aerial welding of circumferential weld, and every section
The attached ladder of tower body, platform are installed before lifting, solve the highly difficult works such as large-scale scrubbing tower transport hardly possible and high altitude operation
Make, improves working efficiency；
2, this engineering method makes tower body pedestal for placed device using section steel material in project, and effective use project is entered the court ground space, just
In the attached ladder of tower body, stage+module and anticorrosive work, working efficiency is improved, saves construction cost；
3, equipment installation uses verticality bidirectional measurement technology, while being surveyed to group to tower body verticality using 2 theodolites
Amount improves squareness measurement accuracy, improves installation speed；
4, continuous welding is synchronized using 12 people's rotations/6 people are symmetrical, reduces welding preheating and rear heat treatment number, effectively controls
Welding deformation processed, it is ensured that quality of weld joint；
5, tower body wall thickness is thicker (δ=90mm), and tower body installation site is about 40 meters with a distance from neighbouring engineering, to guarantee surrounding people people
Body safety, using TOFD+MT detection method, achieve the purpose that efficiently, have record.
Specific embodiment
With reference to embodiment, the present invention is furture elucidated, it should be understood that following specific embodiments are only used for
It is bright the present invention rather than limit the scope of the invention.
This engineering method is welded suitable for large thick-wall low temperature nickel alloy steel equipment, including in the air without compression welding, right
It also can refer to this engineering method in large thick-wall heat resisting steel equipment, stainless steel equipment without the aerial welding of pressure and use.
Low-temp methanol scrubbing tower is the core equipment of low-temp methanol washing process, and welding quality is very crucial；It is especially aerial
Without pressure group clock synchronization, necessary technology measure is taken, guarantees accurate group pair；Analyze 09MnNiDR/SA203 GR.E alloy temperature steel physics
Chemical property analyzes its solderability；When PWHT operations, necessary technical measures are taken, prevent stress collection from neutralizing diffusion
Hydrogen content prevents equipment deformation from generating, guarantees the verticality of equipment installation.
The specific process is as follows:
1, the absolute altitude ground line provided according to construction party, center line carries out repetition measurement to basis in length and breadth, meets related specifications and design
After specification, process handover is carried out.It before equipment installation, needs to have shoveled pitted skin when grouting, place at parallels (to periphery 50mm)
It should even out, the sundries in reserved anchor (bolt) hole should be cleaned out.
2, segmentation tower body group is to base device
Narrow field in project, tower body wall thickness is thicker, equipment weight, 5 sections of arrivals of the tower body point, the not mating tower body group pair of equipment manufacturer
Pedestal uses fashioned iron HW250*250*12mm in project, carries out pedestal production according to tower body diameter, carries out segmentation tower body and places,
Convenient for ladder landing platform installation.
I.3, attached ladder installation
After arrival tower body acceptance(check), tower body successively carries out attached ladder spiral from two sections, three sections, four sections, five sections and up installs.
Ii.4, two sections of tower bodies and skirt welding, lifting
To improve installation effectiveness, segmentation tower body is sleeping when putting, according to equipment nozzle orientation outside every section of tower body segmentation port on
Carry out 0 °, 90 °, 180 °, 270 ° of four heart line positions identified with white paint,
Then welding is grouped on ground in two sections of tower bodies and skirt, and crouch dress；
Finally the tower body welded is vertically sling, tower body is arranged in pedestal and is fixed, the present invention uses two-way squareness measurement,
2 theodolite bidirectional measurements are used simultaneously, are corrected in time, are saved the lifting time, are obtained good economic benefit.
Iii. welding groove
Scrubbing tower always weighs about 711 tons, specification DN3800*84355mm, δ=90mm tower body grooves of welding joints, by GB150.1
~ 150.4-2011 " pressure vessel ", NB/T47015-2011 " steel pressure vessel welding code ", HG/T20584 " steel chemical industry
Vessel fabrication technical requirements " standard use double V groove form；Since tower body material is the conjunction of SA203 GR.E/09MnNiDR low temperature
Jin Gang, to prevent delayed crack, welding needs to carry out weld preheating, for the occupational health and welding quality for guaranteeing welder,
The symmetrical synchronous welding technology of more people must be used.
Iv. manual electric arc welding welding technique
The welding of SA203 GR.E/09MnNiDR low-alloy steel is adopted in order to avoid weld metal and heat affected area reduce low-temperature flexibility
With small thermal weld stress (< 25KJ), when welding, uses quick multi-pass welding as far as possible to reduce overheat；Due to welding rod weld deposit gold
Belonging to large viscosity, solidification is very fast, and when protecting improper or operation technique not clock synchronization, the gas in deposited metal often has little time to escape,
At striking and joint is easy to generate porosity.Strict control interlayer temperature, welding as discontinuous as possible, interlayer temperature
It should control at 100 ~ 200 DEG C；It is appropriate to increase bevel angle, with 55 ± 3 ° for best soldering angle, to increase welding bead number.
The present invention synchronizes continuous welding using 12 people's rotations/6 people are symmetrical, reduces welding preheating and rear heat treatment time
Number, it is ensured that quality of weld joint.
Weld preheating must be uniform, preheating temperature >=150 DEG C, and heat range is that weld seam two sides are respectively not less than weldment thickness
3 times.Preheating temperature should be no less than six pairs away from symmetrical measurement at axis of a weld 50mm, every weld seam temperature measuring point.Tack welding, welding
The temporary welds of work (card) tool, also need to consider preheating requirement, preheating temperature is identical as the formal welding preheating temperature of product.
Every weld seam should be once soldered as far as possible, be broken when connecing in the middle, heat after should taking in time, the measures such as slow cooling, again
It still needs to that preheating is carried out in accordance with regulations when welding.To prevent welding point from generating welding cold cracking, postwelding should also dehydrogenation immediately:
250-300 DEG C/2 hours.
V.5, without aerial group of compression to technology
Two sections of tower bodies weld the attached steel platform in place with tower body group with three sections of tower body groups according to design drawing, so as to staff
It is worked using equipment vertical ladder arrival group the steel platform at place.
It lifts by crane three sections of tower bodies and carries out aerial group pair, using the luffing of crane, rotating mechanism, third section tower body is adjusted substantially
To after installation site, adjusted with the tools tooling such as gantry snap-gauge and jack to correct position.Then theodolite testing tower is used
The verticality of body is detected tower body alignment clearance, unfitness of butt, and is checked nozzle orientation using leveling ruler, steel tape.Above-mentioned each
After item testing result meets design requirement, tack welding is carried out.After the intensity of weld seam is sufficient to bear the external force such as wind load, hang
Vehicle can loose hook.Then building weather proof facility within the scope of about 1.5 meters on the weld seam of cylinder medial and lateral, (tower body should also be arranged anti-
Thunder device), such as protected with fire prevention canopy cloth, working shed should be laid with asbestic blanket radix saposhnikoviae, to guarantee that welding environment is good.
The working shed built must assure that construction personnel, construction equipment safety and conveniently.
6, four sections of tower body, five sections of lifting, welding are successively carried out according to the above operation technique.
7, the non-destructive testing technology of tower body weld seam
Since tower body is high, quality is big, to guarantee surrounding people's personal safety, using TOFD+MT detection method, reaches efficient, has
The purpose of record.Weld seam need to carry out 100%TOFD, meet in NB/T47013.10-2015 II grades it is qualified, B grades of industrial grade；
100% Magnetic testing (MT) meets I grades of qualifications in NB/T47013.4-2015.
I.8, local post weld heat treatment technique
Equipment outer diameter is Φ 3980mm/ Φ 3350mm, and the weld seam that scene need to do local post weld heat treatment includes three shell groups pair
The fillet weld of circumferential weld, three layers of tower tray supporting element and inner walls.Respectively closing up seam and tower tray supporting element is vertical assembled.The second,
Three sections of groups are to circumferential weld away from ground level 24949mm, third and fourth section of group is to circumferential weld away from ground level 48860mm, fourth, fifth section of group
To circumferential weld away from ground level 70040mm.Tower tray supporting element and inner walls angle seam local post weld heat treatment can be with adjacent thereto
Shell group carries out circular seam local post weld heat treatment together.
The quantity of thermocouple and position: shell group on circumferential weld outer wall to circumferentially each at least equal 8 thermocouples and guaranteeing every
The thermocouple of a heating zone 1；Weld seam 1 heat of each heating zone cloth that tower tray support or other attachmentes are mutually welded with shell inside and outside wall
Galvanic couple is simultaneously located at heating district center, if whole circle heats, 8 is circumferentially at least evenly distributed with along cylinder and guarantees each heating zone 1.
Heated perimeter: a) shell group is that the every side of maximum weld width+weld seam is outside from edge to the heated perimeter of circumferential weld
The no less than region of 150 mm, interior external heat；
B) fillet weld heater around the whole circle arrangement of cylinder or is arranged symmetrically between tower tray support and shell, and heated perimeter is maximum weldering
Slit width degree+from the every side of maximum width joint edge genesis or every end is respectively no less than 50mm, interior external heat.
Heat-preserving range: heater coverage area+every side of self-heating band edge genesis or every end are respectively no less than 400mm and are no less than
2 times of width of heating, interior external thermal insulation, all pipe connecting flanges should be wrapped up integrally and be filled in stifled tight in heat-treatment zone.Insulation layer thickness:
No less than 70mm.
Ii.9, postwelding polishing cleaning weld bond
Due to arc crater, electric arc scratch, overlap the defects of stress will be caused to concentrate, postwelding must Welded Joints surface beaten
Mill, the surface defects such as cleaning electric arc scuffing, overlap, arc crater.
Weld seam marking transfer (pipeline number, weld bond number, welder's code name etc.) cannot (steel seal can generate notch effect using steel seal
Answer, form stress and concentrate), it can only be transplanted using marking pen.
10.1 Economic and Efficiency Analysis
It is washed in 450,000 tons/year of synthesis ammonia resettlement transformation project low temperature washing device for methanol of XX company in March, 2018 in May, 2018
Aerial group of tower is washed in construction, using this engineering method, achieves good economic benefit:
1, for welding first-time qualification rate up to 100%, all weld seams carry out 100%TOFD and 100%MT non-destructive testing, all qualified, weldering
It connects superior in quality；
2, using special single side X-type groove type, saving welding rod 536kg reduces by 20056 yuan of welding material cost；
3, it using the symmetrical synchronous welding technology of 12 people's rotation, six people, saves the duration 10 days, reduces by 7.6 ten thousand yuan of engineering labour cost.
Social benefit analysis
The present invention solves large-scale scrubbing tower in the air without compression welding problem, and technology is advanced；For similar Large Towers
The aerial welding construction of body provides reference.
The technical means disclosed in the embodiments of the present invention is not limited only to technological means disclosed in above embodiment, further includes
Technical solution composed by arbitrarily being improved by the above technical characteristic.
Claims (6)
1. large thick-wall low temperature nickel alloy steel equipment group is to welding method, it is characterised in that: the following steps are included:
(1) before equipment installation, the pitted skin of grouting is shoveled, places and is evened out at parallels, reserves the sundries in anchor (bolt) hole
It cleans out；
(2) tower body is divided into 5 sections, carries out pedestal production, and the attached ladder of each section of side of welding according to tower body diameter；
(3) each section of tower body is sleeping when putting, according to equipment nozzle orientation every section of tower body segmentation port lateral surface carry out 0 °, 90 °,
180 °, 270 ° of four heart line positions carry out mark,
(4) two sections of tower bodies and skirt (one section) lie in ground and welding are grouped,
A: being welded, heat < 25KJ thermal weld stress using manual electric arc welding,
B: using double V groove form, and it is 55 ± 3 ° that bevel angle, which increases,
C: weld preheating, more symmetrical synchronous weldings of people, interlayer temperature are controlled at 100 ~ 200 DEG C；
(5) the tower body on-site hoisting after the completion of welding is holded up to come, two-way squareness measurement is used in hoisting process, is used simultaneously
2 theodolite bidirectional measurements, in time correction in place, tower body are arranged in pedestal fixed；
(6) two sections of tower bodies weld place's adjunct platform with tower body group with three sections of tower body groups,
(7) three sections of tower bodies are lifted by crane and carry out aerial group pair, using the luffing of crane, rotating mechanism, third section tower body are adjusted to pacify
After holding position, adjusted with gantry snap-gauge and jack to two sections of tower bodies；Then using the vertical of theodolite testing tower body
Degree is detected tower body alignment clearance, unfitness of butt, and is checked nozzle orientation using leveling ruler, steel tape, and testing result meets design
After it is required that, tack welding is carried out；
(8) four sections of tower body, five sections of lifting, welding are successively carried out according to step (7) technique；
(9) the non-destructive testing technology of tower body weld seam
Using TOFD+MT detection method, all weld seams carry out TOFD ultrasound examination, then carry out 100% Magnetic testing (MT),
(10) local post weld heat treatment technique
Stress relief annealing is carried out using thermocouple heating means；
The quantity of thermocouple and position: circumferential weld outer wall circumferentially each at least 8 thermocouples；Tower tray support or platform, ladder and shell
1 thermocouple of each heating zone cloth of weld seam that internal outer wall mutually welds simultaneously is located at heating district center；
(11) postwelding polishing cleaning weld bond
Postwelding Welded Joints surface is polished, and surface defect is cleared up.
2. large thick-wall low temperature nickel alloy steel equipment group according to claim 1 is to welding method, it is characterised in that: step
(3) the attached ladder spiral of each section of side is upward.
3. large thick-wall low temperature nickel alloy steel equipment group according to claim 1 is to welding method, it is characterised in that: step
(3) it is identified using white paint.
4. large thick-wall low temperature nickel alloy steel equipment group according to claim 1 is to welding method, it is characterised in that: step
(4) preheating must uniformly, preheating temperature >=150 DEG C, and heat range is 3 times that weld seam two sides are respectively not less than weldment thickness；Preheating
Temperature should be no less than six pairs away from symmetrical measurement at axis of a weld 50mm, every weld seam temperature measuring point.
5. large thick-wall low temperature nickel alloy steel equipment group according to claim 1 is to welding method, it is characterised in that: step
(7) after the completion of welding, weather proof facility and lightning protection device are built within the scope of 1.5 meters on the weld seam of cylinder medial and lateral, working shed is answered
It is laid with asbestic blanket.
6. large thick-wall low temperature nickel alloy steel equipment group according to claim 1 is to welding method, it is characterised in that: step
(10) it is heat-treated heated perimeter:
A) shell group is that the every side of maximum weld width+weld seam is no less than 150 mm's outward from edge to the heated perimeter of circumferential weld
Region, interior external heat；
B) fillet weld heater around the whole circle arrangement of cylinder or is arranged symmetrically between tower tray support and shell, and heated perimeter is maximum weldering
Slit width degree+from the every side of maximum width joint edge genesis or every end is respectively no less than 50mm, interior external heat；
It is heat-treated heat-preserving range:
Heater coverage area+every side of self-heating band edge genesis or every end be respectively no less than 400mm and no less than width of heating 2
Times, interior external thermal insulation, in heat-treatment zone all pipe connecting flanges should integrally wrap up and fill in it is stifled tightly；Insulation layer thickness: no less than 70mm.
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| CN110900021A (en) * | 2019-11-28 | 2020-03-24 | 中国化学工程第三建设有限公司 | Reactor assembly welding method in narrow space of dehydrogenation device frame |
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| CN113084380A (en) * | 2021-03-05 | 2021-07-09 | 山西阳煤化工机械（集团）有限公司 | On-site assembly method for synthesis gas/steam co-production gasification furnace |
| CN113199116A (en) * | 2021-04-21 | 2021-08-03 | 中国化学工程第三建设有限公司 | Method for welding aluminum fractionating tower in cold box in assembling mode |
| CN115945817A (en) * | 2022-12-23 | 2023-04-11 | 青岛兰石重型机械设备有限公司 | Stirring port flange flatness control process for ultra-large PTA (pure terephthalic acid) crystallizer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110900021A (en) * | 2019-11-28 | 2020-03-24 | 中国化学工程第三建设有限公司 | Reactor assembly welding method in narrow space of dehydrogenation device frame |
| CN111745317A (en) * | 2020-07-04 | 2020-10-09 | 北京首钢建设集团有限公司 | Method for aligning verticality of tank body by using cross bridge |
| CN113084380A (en) * | 2021-03-05 | 2021-07-09 | 山西阳煤化工机械（集团）有限公司 | On-site assembly method for synthesis gas/steam co-production gasification furnace |
| CN113084380B (en) * | 2021-03-05 | 2022-06-14 | 山西阳煤化工机械（集团）有限公司 | On-site assembly method for synthesis gas/steam co-production gasification furnace |
| CN113199116A (en) * | 2021-04-21 | 2021-08-03 | 中国化学工程第三建设有限公司 | Method for welding aluminum fractionating tower in cold box in assembling mode |
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