CN216141591U - Thick wall storage tank pressure-bearing girth weld postweld heat treatment system - Google Patents
Thick wall storage tank pressure-bearing girth weld postweld heat treatment system Download PDFInfo
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- CN216141591U CN216141591U CN202121097018.XU CN202121097018U CN216141591U CN 216141591 U CN216141591 U CN 216141591U CN 202121097018 U CN202121097018 U CN 202121097018U CN 216141591 U CN216141591 U CN 216141591U
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Abstract
The utility model provides a thick-wall storage tank pressure-bearing ring weld postweld heat treatment system, which comprises a supporting device, a sliding device, a limiting baffle, a heater and a temperature measurement and control system, the supporting device is of a frame structure, a plurality of supporting surfaces are arranged on the supporting device, a sliding device is longitudinally arranged on each supporting surface, the pressure-bearing ring of the thick-wall storage tank is transversely arranged on the sliding device along the supporting surface, the limiting baffle is fixed on the supporting device, the heaters are arranged at the outer sides of the two end positions and the inner side of the middle position of the pressure-bearing ring, the heaters are paved at the two sides of the circumferential fillet weld of the pressure-bearing ring of the thick-wall storage tank, the two sides of the longitudinal butt weld and the back side of the pressure-bearing ring back plate of the thick-wall storage tank, the temperature measuring system comprises a thermocouple and heat treatment intelligent temperature control equipment, wherein the heat treatment intelligent temperature control equipment is connected with the thermocouple and the heater and is used for controlling the heating power of the heater according to a set heat treatment process. During heat treatment, the temperature is more balanced by multi-surface heating, and the deformation is prevented by the limiting baffle and the temperature measurement and control system.
Description
Technical Field
The utility model relates to a heat treatment system of a metal pressure-bearing structure, in particular to a post-weld heat treatment system of a pressure-bearing ring weld of a thick-wall storage tank.
Background
At present, with the design and construction technology of large storage tanks in China being more and more advanced, the storage tanks are designed to be larger and the wall thickness of the designed pressure-bearing ring is thicker and thicker. In recent years, a large number of large thick-wall storage tanks are continuously built on a large scale petrochemical engineering construction site. In the installation process, whether the pressure-bearing girth welding seam of the thick-wall storage tank needs to be subjected to postweld heat treatment or not always has great controversy. The large-scale storage tank pressure-bearing girth weld seam postweld heat treatment is different from the conventional pressure container, and particularly the large-scale low-temperature storage tank has larger diameter, poorer structural rigidity, more uncontrollable factors in the process of the pressure-bearing girth weld seam postweld heat treatment and difficult guarantee of construction quality. For a large storage tank, the maximum allowable thickness of a steel plate is limited on the premise of not performing heat treatment in the specification, and the limitation of the maximum thickness of a tank wall which is free from post-welding heat treatment according to welding tests and experience is 40-45 mm, but the pressure-bearing ring is not clearly limited. When the wall thickness of the bearing ring exceeds the empirical value of no heat treatment, particularly in some thick-wall storage tank installation projects in China, the problem that a 52mm thick bearing ring is cracked after welding occurs, how to perform postweld heat treatment on the bearing ring is not available for inquiry at home and abroad, and no standard is available for reference, so that the construction difficulty is extremely high.
How to carry out postweld heat treatment on the pressure-bearing girth weld of the thick-wall storage tank has no precedent for construction at home and abroad. In theory, three methods can be selected by the existing heat treatment technology. One is the integral heat treatment in the furnace, the method has simple construction method, good temperature uniformity, easy process realization and higher temperature control precision, but is limited by the furnace construction period and the transportation cost of equipment for entering and exiting the furnace, and the cost is higher. And the construction quality can not be guaranteed because the pressure-bearing ring in the furnace can not be controlled by thermal deformation. The second method is an explosion method, which adopts the steps that explosives are laid on the surface of a welding seam for one-time detonation, and the impact generated by explosion is utilized to reduce the stress in the welding seam, but the method is only limited in the power industry, is not applied in the petrochemical industry, and does not have a proper verification method for verifying the result. The third is electric heating heat treatment, and the method has good uniformity of heat treatment temperature, high accuracy of temperature control and more flexible construction method. However, the pressure-bearing girth weld of the thick-wall storage tank is mostly fillet weld and thick in wall thickness due to long weld, the temperature difference is difficult to control, and the temperature uniformity is difficult to guarantee. Meanwhile, the bearing ring is designed into a curved surface, so that the deformation amount is too large and is difficult to control during heat treatment, the deformation is easy to occur, and the construction quality is difficult to ensure.
Disclosure of Invention
The utility model solves the technical problem of providing a thick-wall storage tank pressure-bearing ring weld seam postweld heat treatment system, which ensures the uniformity of temperature in the heat treatment process, improves the temperature control precision, reduces the temperature difference, controls the deformation of the pressure-bearing ring within a reasonable range, and effectively ensures the heat treatment quality.
In order to achieve the purpose, the utility model provides a thick-wall storage tank pressure-bearing ring weld seam postweld heat treatment system, which is characterized in that: comprises a supporting device, a sliding device, a limit baffle, a heater and a temperature measurement and control system, wherein the supporting device is of a frame structure, a plurality of supporting surfaces are arranged on the supporting device, the sliding device is longitudinally arranged on each supporting surface, a thick-wall storage tank pressure-bearing ring is transversely arranged on the sliding device along the supporting surface, the limit baffle is fixed on the supporting device, the heaters are arranged at the outer sides of the two end positions and the inner side of the middle position of the pressure-bearing ring, the heaters are paved at the two sides of the circumferential fillet weld of the pressure-bearing ring of the thick-wall storage tank, the two sides of the longitudinal butt weld and the back side of the pressure-bearing ring back plate of the thick-wall storage tank, the temperature measuring system comprises thermocouples and heat treatment intelligent temperature control equipment, wherein the thermocouples are fixed on the two sides of a welding line and the back side of the pressure-bearing ring back plate of the thick-wall storage tank, and the heat treatment intelligent temperature control equipment is connected with the thermocouples and the heater and used for controlling the heating power of the heater according to a set heat treatment process.
Further, the plurality of supporting surfaces are arranged on the same horizontal plane, so that enough support can be provided for the thick-wall storage tank pressure bearing ring, and deformation is prevented.
Furthermore, the sliding device is characterized in that a steel plate is laid at the transverse middle position of each supporting surface of the supporting device, a plurality of round steel bars are transversely placed on the steel plates, and thin steel plates with the same specification are laid on the round steel bars, so that the pressure-bearing ring of the thick-wall storage tank can be freely expanded without being constrained in the heat treatment process.
Furthermore, lubricating grease is coated on the round steel, so that the sliding is smoother.
Furthermore, each heater is provided with a thermocouple, and the thermocouples are fixed on two sides of the welding line by adopting a welding thermocouple instrument in a spot welding manner so as to improve the control precision and the measurement accuracy of the heat treatment temperature.
The utility model has the following advantages:
(1) the heating efficiency is high, and the heat treatment temperature is more balanced. The heaters are laid on two sides of the circumferential large-angle fillet weld, the small-angle fillet weld and the longitudinal butt weld, and laid on the back plate, and the heaters heat multiple surfaces during heat treatment, so that the heating efficiency is high, and the temperature is more balanced.
(2) The deformation-preventing design is reasonable and practical. Deformation in the heat treatment process of the pressure-bearing ring is reduced by the deformation preventing systems such as the heat treatment and the like which are arranged on the ground in a segmented heat treatment mode and are in central symmetry with two groups of pressure-bearing ring welding lines when the pressure-bearing ring welding lines are installed at high altitude, and construction quality is ensured.
(3) The temperature measurement and control accuracy is high. The thermocouple is fixed on the edge of a welding seam by spot welding through the thermocouple welding instrument, so that the temperature measuring precision is ensured, and the temperature measuring precision is ensured because each heater is provided with one temperature measuring point.
(4) The method is flexible and simple to operate. The utility model adopts electric heating heat treatment, has simple operation, is not limited by site environment, can be constructed on the ground and at high altitude, and has more convenient and flexible method.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the slide of the present invention;
FIG. 3 is a schematic view of a circumferential fillet heater arrangement according to the present invention;
FIG. 4 is a schematic view of a longitudinal butt weld heater arrangement of the present invention;
FIG. 5 is a schematic view of a thermometry arrangement of the present invention;
wherein: 1. a support device; 2. a middle limit baffle; 3. limiting baffles at two sides; 4. a pressure-bearing ring; 5. a steel plate; 6. round steel; 7. a small fillet weld heater; 8. a back plate heater; 9. a back plate; 10. a large angle fillet weld heater; 11. a vertical plate; 12. longitudinal butt welding; 13. a vertical plate heater; 14. a small fillet weld; 15. a temperature measuring point I; 16. a temperature measuring point II; 17. a large angle fillet weld.
Detailed Description
For better understanding of the purpose, structure and function of the present invention, the following describes a thick-walled storage tank pressure-bearing girth weld post-weld heat treatment system in further detail with reference to the accompanying drawings.
The post-weld heat treatment system for the pressure-bearing ring weld of the thick-wall storage tank carries out heat treatment on the weld formed by welding the pressure-bearing ring of the thick-wall storage tank during ground prefabrication, a plurality of small sections of the pressure-bearing ring are welded and assembled, and the large welded pressure-bearing ring weld is subjected to heat treatment. The thick-wall storage tank pressure-bearing ring weld postweld heat treatment system comprises a supporting device, a sliding device, a limiting baffle, a heating device and a temperature measurement and control system.
Referring to fig. 1, the supporting device 1 is a rectangular frame formed by welding angle steel, i-steel and channel steel, and is provided with a plurality of supporting surfaces for supporting the bearing ring, and each supporting surface is ensured to be on the same horizontal plane and qualified through levelness inspection.
Referring to fig. 2, vertical slider that sets up of every holding surface of strutting arrangement, the whole horizontal placing of holding surface along the holding surface of pressure-bearing ring is on slider, slider can be the finished product slider who buys on the market, also can be simple and easy slider, the slider of this embodiment is to lay the steel sheet 5 of appropriate specification at the horizontal intermediate position of each holding surface of strutting arrangement, it is certain interval apart along transversely placing a plurality of round steel 6 to go up, scribble lubricating grease on the round steel, for example butter, lay the steel sheet 5 of the same specification again on the round steel 6, ensure that pressure-bearing ring 4 can freely expand in heat treatment process and drive steel sheet 5 and slide, do not receive any external force to constrain.
Referring to fig. 1, the expansion amount and the shrinkage amount of the pressure-bearing ring welding line in the heat treatment process are different due to uneven stress distribution in the assembly and welding processes, once the shrinkage amount in the cooling process is too large, the pressure-bearing ring can deform irreversibly, therefore, a limiting measure is arranged in the cooling process, namely limiting devices are arranged in the middle and at two ends of the pressure-bearing ring, and external force is applied to limit the deformation amount of the pressure-bearing ring to influence the deformation amount. This embodiment carries on spacingly through both sides limit baffle 3 and middle limit baffle 2, limit baffle adopts the angle steel welding preparation to form, it is fixed in on the ground strutting arrangement, middle limit baffle 2 is located the bearing ring intermediate position inboard, both sides limit baffle 3 is located the bearing ring both ends position outside, limit baffle's relative position on strutting arrangement requires the setting according to the radian of bearing ring, limit baffle height is according to the bearing ring altitude determination, can play limiting displacement can. In the heat treatment and temperature reduction process, the two ends of the pressure-bearing ring displace towards the outside, and when the middle contracts towards the inside, the deformation amount of the pressure-bearing ring can be controlled within a reasonable range so as to obtain the arch height parameter meeting the installation requirement.
Referring to fig. 3 and 4, the heaters are laid on both sides of each weld and the back side of the back plate of the pressure-bearing ring, the pressure-bearing ring weld comprises a circumferential fillet weld and a longitudinal butt weld, wherein the circumferential fillet weld comprises a large-angle fillet weld 17 and a small-angle fillet weld 14, the heaters 7 are symmetrically laid along both sides of the small-angle fillet weld 14, and the heaters 10 are symmetrically laid along both sides of the large-angle fillet weld 17; a plurality of heaters 8 are laid on the upper side of the back plate 9 side by side along two sides of the circumferential weld position; the vertical plate heaters 13 are laid side by side along two sides of the longitudinal butt welding seam 12 on the vertical plate 11, and the heaters are laid on the inner side and the outer side oppositely. In order to ensure the heating effect and ensure that the pressure-bearing circumferential weld is heated uniformly, the heating width is further enlarged on the basis of meeting the requirement of the heating width, and the heat treatment temperature balance is ensured. During heat treatment, the heaters of the large-angle fillet weld and the small-angle fillet weld, the heater on the back side of the back plate and the heaters on the inner side and the outer side of the longitudinal butt weld are heated simultaneously, so that the heat treatment effect is ensured, the pressure-bearing girth weld is heated uniformly, and the temperature is balanced.
Referring to fig. 5, the temperature measurement and control system comprises a thermocouple, a compensation wire and heat treatment intelligent temperature control equipment, and the thermocouple is fixed on the edges of two sides of a welding seam by adopting a welding thermocouple instrument in a spot welding mode at a temperature measurement point II 16, so that the thermocouple is prevented from loosening and falling off in the heat treatment process, and the temperature measurement precision is improved. The number of the temperature measuring points is set according to the number of the heaters, namely, one temperature measuring point is arranged on each heater, and the temperature measuring points are uniformly arranged in a pairwise staggered manner, so that the temperature measuring and controlling precision is greatly improved. The thermocouple and the heater are isolated by adopting heat insulation materials such as an aluminum silicate needle blanket and the like, the heater is prevented from directly heating the hot end of the thermocouple, the thermocouple is spot-welded on the proper position on welding parent metal on two sides of a welding seam by adopting a welding thermocouple instrument on the back surface of the back plate to be used as a temperature measuring point I15, and the temperature of the welding parent metal on two sides of the welding seam of the back plate at a certain distance is measured. The compensation lead is connected with the thermocouple and the heat treatment intelligent temperature control equipment and is responsible for transmitting a temperature feedback signal, the heat treatment intelligent temperature control equipment is connected with the heater, and the heat treatment intelligent temperature control equipment receives the temperature feedback signal of the thermocouple and controls the heat output of the heater according to a set heat treatment process.
Claims (5)
1. The utility model provides a thick wall storage tank pressure-bearing girth weld postweld heat treatment system which characterized in that: comprises a supporting device (1), a sliding device, a limiting baffle, a heater and a temperature measurement and control system, the supporting device (1) is of a frame structure, a plurality of supporting surfaces are arranged on the supporting device, the sliding device is longitudinally arranged on each supporting surface, the pressure-bearing ring of the thick-wall storage tank is transversely arranged on the sliding device along the supporting surface, the limiting baffle is fixed on the supporting device, and are arranged at the outer sides of the two end positions and the inner side of the middle position of the pressure-bearing ring, the heaters are laid at the two sides of the circumferential fillet weld of the pressure-bearing ring of the thick-wall storage tank, the two sides of the longitudinal butt weld (12) and the back side of the pressure-bearing ring back plate of the thick-wall storage tank, the temperature measuring system comprises thermocouples and heat treatment intelligent temperature control equipment, wherein the thermocouples are fixed on the two sides of a welding line and the back side of the pressure-bearing ring back plate of the thick-wall storage tank, and the heat treatment intelligent temperature control equipment is connected with the thermocouples and the heater and used for controlling the heating power of the heater according to a set heat treatment process.
2. The thick-walled storage tank pressure-bearing girth weld post-weld heat treatment system of claim 1, wherein: the plurality of support surfaces are on a horizontal plane.
3. The thick-walled storage tank pressure-bearing girth weld post-weld heat treatment system of claim 1, wherein: the sliding device is characterized in that a steel plate (5) is laid at the transverse middle position of each supporting surface of the supporting device, a plurality of round steel (6) are transversely placed on the supporting surface, and the steel plates (5) with the same specification are laid on the round steel (6).
4. The thick-walled storage tank pressure-bearing girth weld post-weld heat treatment system of claim 3, wherein: lubricating grease is smeared on the round steel.
5. The thick-walled storage tank pressure-bearing girth weld post-weld heat treatment system of claim 1, wherein: each heater is provided with a thermocouple, and the thermocouples are fixed on two sides of the welding line by adopting a welding thermocouple instrument in a spot welding manner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121097018.XU CN216141591U (en) | 2021-05-21 | 2021-05-21 | Thick wall storage tank pressure-bearing girth weld postweld heat treatment system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121097018.XU CN216141591U (en) | 2021-05-21 | 2021-05-21 | Thick wall storage tank pressure-bearing girth weld postweld heat treatment system |
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| Publication Number | Publication Date |
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| CN216141591U true CN216141591U (en) | 2022-03-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202121097018.XU Active CN216141591U (en) | 2021-05-21 | 2021-05-21 | Thick wall storage tank pressure-bearing girth weld postweld heat treatment system |
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| CN (1) | CN216141591U (en) |
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- 2021-05-21 CN CN202121097018.XU patent/CN216141591U/en active Active
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