A post-weld heat treatment apparatus for in-service vessel fillet welds

Abstract

The application discloses a kind of in-service container fillet weld postweld heat treatment device, container includes cylinder and nozzle, fillet weld is located at the junction of cylinder and nozzle, the device includes: cable arrangement support, with fillet weld is adapted, for embedding and fixed cable;Cable, around being arranged on cable arrangement support;Heat insulation layer, lay between container and cable arrangement support;Multiple thermocouples, around fillet weld distribution, for measuring the temperature distribution of fillet weld.The cable arrangement support of the application can be flexibly set on the cylinder and nozzle of container, the cable can be more conveniently embedded and fixed in the arc-shaped groove of cable arrangement plate, avoid the problem that traditional direct laying induction cable needs to be fixed and adjusted repeatedly, improve work efficiency, while multiple thermocouples distributed in fillet weld can accurately measure the temperature distribution of fillet weld, according to temperature distribution flexibly adjust the power of heating power supply, reduce harmful temperature gradient.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of post-weld heat treatment, in particular to a post-weld heat treatment device for a corner weld of an in-service container. BACKGROUND

[0002] The corner weld of a large thick-walled in-service container product needs to be repaired when the defect exceeds the standard during regular inspection, and the post-weld heat treatment needs to be performed after the weld repair.

[0003] The large in-service container is generally vertical, with a height of several dozen meters, and the site conditions are complex, so the repair conditions are severely limited. The traditional gas furnace cannot be used for post-weld heat treatment, and the far-infrared ceramic electric heating method is generally used at present. However, the far-infrared ceramic electric heater is a traditional heat radiation heating device, which cannot guarantee that the core temperature of the large thick-walled in-service container product with a wall thickness of 130 mm or more meets the requirements of 620℃±14℃ and local temperature uniformity even if double-sided heating is performed on the inner and outer walls of the shell. The best way is to return to the manufacturing plant for repair, but this method has a long cycle, high transportation cost, and cannot meet the needs of the site device maintenance cycle node.

[0004] Therefore, it is necessary to develop a post-weld heat treatment device for the corner weld of a large thick-walled in-service container to solve the above technical problems. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a post-weld heat treatment device for a corner weld of an in-service container to solve the problems of high cost, long cycle, and low efficiency of post-weld heat treatment of a large thick-walled vertical in-service container corner weld. The present application realizes in-situ repair heat treatment of the corner weld, improves the efficiency of post-weld heat treatment of the corner weld, and prolongs the service life of the in-service container.

[0006] To achieve the above purpose, the present application provides a post-weld heat treatment device for a corner weld of an in-service container, wherein the container comprises a cylinder and a connecting pipe, and the corner weld is located at the connection between the cylinder and the connecting pipe, and the device comprises:

[0007] A cable arrangement support is adapted to the corner weld and used for embedding and fixing cables;

[0008] Cables are arranged on the cable arrangement support;

[0009] An insulation layer is laid between the container and the cable arrangement support;

[0010] A plurality of thermocouples are uniformly distributed around the corner weld and used for measuring the temperature distribution of the corner weld;

[0011] The cable arrangement support comprises a fixing ring and a plurality of cable arrangement plates arranged on the fixing ring.

[0012] The cable arrangement plate is L-shaped, one side surface of which is adapted to the fillet weld, and the other side surface is provided with an arc-shaped groove for embedding and fixing cables.

[0013] According to the present application, the cable arrangement plate comprises a first cable arrangement plate arranged on the outer wall of the cylinder in the radial direction of the connecting pipe and a second cable arrangement plate arranged on the outer wall of the connecting pipe in the axial direction of the connecting pipe.

[0014] One end of the second cable arrangement plate is perpendicularly connected to one side surface of the fixing ring, and the other end is perpendicularly connected to one end of the first cable arrangement plate.

[0015] According to the present application, the inner side surface of the fixing ring is adapted to the outer wall of the connecting pipe, one side of the first cable arrangement plate faces the outer wall of the cylinder, and the other side is provided with a plurality of arc-shaped grooves arranged at intervals, and one side of the second cable arrangement plate faces the outer wall of the connecting pipe, and the other side is provided with a plurality of arc-shaped grooves arranged at intervals.

[0016] According to the present application, the other side of the first cable arrangement plate is provided with M arc-shaped grooves arranged at intervals, and M ranges from 8 to 10; the height of the second cable arrangement plate is 200-250mm, the other side of the second cable arrangement plate is provided with N arc-shaped grooves arranged at intervals, and N ranges from 4 to 5. The free ends of a plurality of the first cable arrangement plates form a circle, and the diameter of the circle is 1600-2000mm.

[0017] Preferably, the heat preservation layer comprises a plurality of heat preservation cotton layers and a heat preservation cloth covering the plurality of heat preservation cotton layers, and the heat preservation cotton layers are made of aluminum silicate.

[0018] Preferably, each heat preservation cotton layer comprises a plurality of heat preservation cotton blocks that are overlapped with each other, the overlapping width between adjacent heat preservation cotton blocks is greater than 100mm, and the overlapping parts of each heat preservation cotton layer are staggered with each other.

[0019] Preferably, the total thickness of the plurality of heat preservation cotton layers is not less than 50mm.

[0020] According to the present application, the heat preservation layer is fixed on the cylinder and the connecting pipe by battens and / or heat preservation nails.

[0021] According to the present application, the cable comprises a first cable and a second cable.

[0022] The first cable is spirally arranged on the arc-shaped groove of the first cable arrangement plate, and the two ends of the first cable are respectively provided with inner joints and outer joints.

[0023] The second cable is spirally arranged on the arc-shaped groove of the second cable arrangement plate, and two ends of the second cable are respectively provided with an upper joint and a lower joint.

[0024] Preferably, the inner joint and the outer joint are respectively connected with the first power supply; the upper joint and the lower joint are respectively connected with the second power supply; or

[0025] The inner joint is connected with the lower joint, and the outer joint and the upper joint are respectively connected with the first power supply.

[0026] The effect of the present application is:

[0027] (1) The cable arrangement support of the present application can be flexibly arranged on the cylinder and the connecting pipe of the in-service container, and the cable can be more conveniently embedded and fixed in the arc-shaped groove of the cable arrangement plate, thereby avoiding the problem of repeated fixing and adjustment required by the traditional direct laying of the induction cable, improving the work efficiency, and at the same time, the multiple thermocouples uniformly distributed on the fillet weld can accurately measure the temperature distribution of the fillet weld, and the power of the heating power supply can be flexibly adjusted according to the temperature distribution, thereby reducing the harmful temperature gradient.

[0028] (2) The first cable arrangement plate and the second cable arrangement plate of the present application can be respectively matched with the cylinder and the connecting pipe, thereby making the operation more convenient.

[0029] (3) The post-weld heat treatment device and method of the present application improve the production efficiency of the fillet weld repair of the connecting pipe of the in-service container, realize the in-situ repair heat treatment of the fillet weld of the large thick-walled in-service vertical container connecting pipe under complex working conditions, and prolong the service life of the in-service container.

[0030] Other features and advantages of the present application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0031] The above and other objects, features and advantages of the present application will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings in which like reference characters refer to like parts throughout the several views, in which exemplary embodiments of the present application are shown.

[0032] Figure 1 It is a whole structure schematic view of the post-weld heat treatment device for the container fillet weld of the present application.

[0033] Figure 2 It is a whole structure schematic view of the cable arrangement support of the post-weld heat treatment device for the container fillet weld of the present application.

[0034] Figure 3 It is a structure schematic view of the cable arrangement plate of the post-weld heat treatment device for the container fillet weld of the present application.

[0035] BRIEF DESCRIPTION OF DRAWINGS

[0036] 1 - first power supply, 2 - second power supply, 3 - cylinder, 4 - nozzle, 5 - fillet weld, 6 - first cable, 7 - second cable, 8 - cable arrangement support, 9 - cable arrangement plate, 10 - first cable arrangement plate,

[0037] 11 - second cable arrangement plate, 12 - arc-shaped groove, 13 - outer joint, 14 - inner joint, 15 - lower joint,

[0038] 16 - upper joint, 17 - thermal insulation layer, 18 - first thermocouple, 19 - second thermocouple. DETAILED DESCRIPTION

[0039] The preferred embodiments of the present application will be described in more detail below. Although the preferred embodiments of the present application are described below, it is understood that the present application can be practiced with various modifications and changes within the scope and spirit of the present application, which should not be interpreted as being limited to the embodiments set forth herein.

[0040] In the present disclosure, the orientation words such as "upper, lower" used without the opposite description generally refer to the upper and lower of the device in the normal use state, for example, the figure surface direction of Figure 1 , "inner, outer" refers to relative to the device profile. In addition, the terms "first, second, third" are only for descriptive purposes, and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first, second, third" can explicitly or implicitly include one or more features. In the description of the present disclosure, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0041] The present application provides a post-weld heat treatment device for the fillet weld 5 of an in-service container, as shown in Figures 1-3 , the container includes a cylinder 3 and a nozzle 4, and the fillet weld 5 is located at the connection of the cylinder 3 and the nozzle 4, and the device comprises:

[0042] A cable arrangement support 8, which is adapted to the fillet weld 5, is used to embed and fix the cable;

[0043] A cable is wound on the cable arrangement support 8;

[0044] A thermal insulation layer 17 is laid between the container and the cable arrangement support 8;

[0045] A plurality of thermocouples are evenly distributed around the fillet weld 5 for measuring the temperature distribution of the fillet weld 5;

[0046] The cable arrangement support 8 includes a fixing ring and a plurality of cable arrangement plates 9 evenly distributed on the fixing ring;

[0047] The cable arrangement plate 9 is L-shaped, one side surface is adapted to the fillet weld 5, and the other side surface is provided with arc-shaped grooves 12 for embedding and fixing cables.

[0048] In the present application, the plurality of thermocouples includes a plurality of first thermocouples 18 uniformly arranged on the cylinder body 3 and a plurality of second thermocouples 19 uniformly arranged on the connecting pipe 4.

[0049] The plurality of first thermocouples 18 is used to measure the temperature distribution of the cylinder body 3, and the plurality of second thermocouples 19 is used to measure the temperature distribution of the connecting pipe 4.

[0050] Each thermocouple is not more than 50 mm away from the center of the fillet weld 5.

[0051] In the present application, the cable arrangement support 8 can be flexibly arranged on the cylinder body 3 and the connecting pipe 4 of the container, and the cable can be more conveniently embedded and fixed in the arc-shaped grooves 12 of the cable arrangement plate 9, avoiding the problem of repeated fixing and adjustment required by traditional direct laying of induction cables, improving work efficiency, and at the same time, the plurality of thermocouples uniformly arranged on the fillet weld 5 can accurately measure the temperature distribution of the fillet weld 5, flexibly adjust the power of the heating power supply according to the temperature distribution, and reduce harmful temperature gradient.

[0052] According to the present application, the cable arrangement plate 9 includes a first cable arrangement plate 10 arranged on the outer wall of the cylinder body 3 along the radial direction of the connecting pipe 4 and a second cable arrangement plate 11 arranged on the outer wall of the connecting pipe 4 along the axial direction of the connecting pipe 4.

[0053] One end of the second cable arrangement plate 11 is perpendicularly connected to one side surface of the fixing ring, and the other end is perpendicularly connected to one end of the first cable arrangement plate 10.

[0054] According to the present application, the inner side surface of the fixing ring is adapted to the outer wall of the connecting pipe 4, one side of the first cable arrangement plate 10 faces the outer wall of the cylinder body 3, the other side is provided with a plurality of arc-shaped grooves 12 arranged at intervals, and one side of the second cable arrangement plate 11 faces the outer wall of the connecting pipe 4, the other side is provided with a plurality of arc-shaped grooves 12 arranged at intervals.

[0055] Preferably, the other side of the first cable arrangement plate 10 is provided with M arc-shaped grooves 12 arranged at intervals, and M ranges from 8 to 10. The height of the second cable arrangement plate 11 is 200-250 mm, and the other side of the second cable arrangement plate 11 is provided with N arc-shaped grooves 12 arranged at intervals, and N ranges from 4 to 5.

[0056] The free ends of the plurality of first cable arrangement plates 10 form a circle, and the diameter of the circle is 1600-2000 mm.

[0057] Preferably, the heat preservation layer 17 includes a plurality of heat preservation cotton layers and a heat preservation cloth 18 covering the plurality of heat preservation cotton layers, and the heat preservation cotton layer is made of aluminum silicate.

[0058] Preferably, each thermal insulation cotton layer comprises a plurality of thermal insulation cotton blocks that are overlapped with each other, the overlapping width between adjacent thermal insulation cotton blocks is greater than 100 mm, and the overlapping parts of the thermal insulation cotton layers are staggered with each other.

[0059] Preferably, the total thickness of the plurality of thermal insulation cotton layers is not less than 50 mm.

[0060] According to the present application, the thermal insulation layer 17 is fixed on the cylinder body 3 and the nozzle 4 by means of the battens and / or the thermal insulation nails.

[0061] According to the present application, the cable comprises a first cable 6 and a second cable 7.

[0062] The first cable 6 is spirally arranged on the arc-shaped groove 12 of the first cable arrangement plate 10, and the two ends of the first cable 6 are respectively provided with an inner joint 14 and an outer joint 13.

[0063] The second cable 7 is spirally arranged on the arc-shaped groove 12 of the second cable arrangement plate 11, and the two ends of the second cable 7 are respectively provided with an upper joint 16 and a lower joint 15. 。

[0064] According to the present application, the inner joint 14 and the outer joint 13 are respectively connected with the first power supply 1, and the upper joint 16 and the lower joint 15 are respectively connected with the second power supply 2.

[0065] The inner joint 14 is connected with the lower joint 15, and the outer joint 13 and the upper joint 16 are respectively connected with the first power supply 1.

[0066] In the present application, the first cable arrangement plate 10 and the second cable arrangement plate 11 can be respectively matched with the cylinder body 3 and the nozzle 4, so that the operation is more convenient, and meanwhile, the number of turns and the turn spacing of the first cable 6 and the second cable 7 can be customized according to the actual working condition of the fillet weld 5, so that the heat treatment process is more accurate and controllable.

[0067] In the present application, the actual heating mode of the fillet weld 5 can be determined according to the actual working condition of the cylinder body 3 and the nozzle 4. If the working conditions of the two are close, the first cable 6 and the second cable 7 can be connected in series and heated by the same power supply. If the working conditions of the two are quite different, in order to realize uniform heating and reduce harmful temperature gradient, the two are heated by two power supplies respectively.

[0068] In the present application, according to the actual situation of the equipment and the thermal calculation, the induction heating power supply and the heating cable are selected and matched, and the rated power P of the induction heating power supply can be calculated according to the following formula:

[0069]

[0070] Wherein, P is the rated power of the induction heating power supply, C is the average specific heat capacity of the steel material, T1 is the initial temperature of the steel material, T2 is the heating temperature of the steel material, η is the total efficiency of the heating system, ρ is the density of the steel material, δ is the penetration depth, R is the outer diameter of the cylinder 3 or the connecting pipe 4, L1 is the length of the heated base material, and t is the heat penetration time.

[0071] In the present application, the cable model is determined according to the rated power P of the induction heating power supply.

[0072] In the present application, the controller (not shown) can be used to control the first power supply 1 and / or the second power supply 2 to heat the fillet weld 5 according to the temperature distribution of the fillet weld 5, so as to reduce the harmful temperature gradient.

[0073] The present application also provides a post-weld heat treatment method for the container fillet weld 5, which adopts the heat treatment device described above, and the processing method comprises the following steps:

[0074] Setting multiple thermocouples: uniformly setting multiple thermocouples on the cylinder 3 and the connecting pipe 4 around the fillet weld 5;

[0075] Laying the heat insulation layer 17: uniformly laying the heat insulation layer 17 on the cylinder 3 and the connecting pipe 4 around the fillet weld 5;

[0076] Setting the cable arrangement bracket 8: setting the cable arrangement bracket 8 on the cylinder 3 and the connecting pipe 4;

[0077] Winding the cable: winding the cable on the first cable arrangement plate 10 and the second cable arrangement plate 11, respectively;

[0078] Heating the fillet weld 5: connecting the cable to the power supply to heat the fillet weld 5.

[0079] The above has described the embodiments of the present application, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A post-weld heat treatment apparatus for fillet welds of an in-service vessel, the vessel comprising a cylinder and a nozzle, the fillet weld being located at the connection between the cylinder and the nozzle, characterized in that, The device includes: A cable routing bracket, adapted to the fillet weld, is used to embed and secure the cable; The cable is wound around the cable arrangement bracket; An insulation layer is laid between the container and the cable arrangement bracket; Multiple thermocouples are evenly distributed around the fillet weld to measure the temperature distribution of the fillet weld. The cable arrangement bracket includes a fixing ring and a plurality of cable arrangement plates evenly distributed on the fixing ring; The cable arrangement plate is L-shaped, with one side surface conforming to the fillet weld and the other side surface having an arc-shaped groove for embedding and fixing the cable. The cable arrangement plate includes a first cable arrangement plate arranged radially on the outer wall of the cylinder and a second cable arrangement plate arranged axially on the outer wall of the pipe. One end of the second cable arrangement plate is perpendicularly connected to one side of the ring surface of the fixing ring, and the other end is perpendicularly connected to one end of the first cable arrangement plate; The inner ring surface of the fixing ring is adapted to the outer wall of the connector. One side of the first cable arrangement plate faces the outer wall of the cylinder, and the other side is provided with a plurality of arc-shaped grooves arranged at intervals. One side of the second cable arrangement plate faces the outer wall of the connector, and the other side is provided with a plurality of arc-shaped grooves arranged at intervals. The other side of the first cable arrangement plate is provided with M arc-shaped grooves arranged at intervals, where M ranges from 8 to 10; the height of the second cable arrangement plate is 200-250mm, and the other side of the second cable arrangement plate is provided with N arc-shaped grooves arranged at intervals, where N ranges from 4 to 5. The free ends of a plurality of the first cable arrangement plates form a circle, the diameter of which is 1600 to 2000 mm; The cable type is determined based on the rated power of the induction heating power supply, and the formula for calculating the rated power of the induction heating power supply is as follows: Where P is the rated power of the induction heating power supply, C is the average specific heat capacity of the steel, T1 is the initial temperature of the steel, T2 is the heating temperature of the steel, η is the total efficiency of the heating system, ρ is the density of the steel, δ is the penetration depth, R is the outer diameter of the cylinder 3 or the connecting pipe 4, L1 is the length of the heating base material, and t is the through-heating time.

2. The apparatus according to claim 1, characterized in that, The insulation layer includes multiple insulation cotton layers and an insulation cloth covering the multiple insulation cotton layers, wherein the insulation cotton layers are made of aluminum silicate.

3. The apparatus according to claim 2, characterized in that, Each insulation layer consists of multiple overlapping insulation blocks, with an overlap width greater than 100mm between adjacent insulation blocks, and the overlapping portions of each insulation layer are staggered.

4. The apparatus according to claim 2, characterized in that, The total thickness of the multiple insulation cotton layers is not less than 50mm.

5. The apparatus according to claim 1, characterized in that, The insulation layer is fixed to the cylinder and the connecting pipe by pressure strips and / or insulation nails.

6. The apparatus according to claim 1, characterized in that, The cable includes a first cable and a second cable; The first cable is spirally wound around the arc-shaped groove of the first cable arrangement plate, and an inner connector and an outer connector are respectively provided at both ends of the first cable. The second cable is spirally wound around the arc-shaped groove of the second cable arrangement plate, and an upper connector and a lower connector are respectively provided at both ends of the second cable.

7. The apparatus according to claim 6, characterized in that, The inner and outer connectors are respectively connected to the first power source; the upper and lower connectors are respectively connected to the second power source; or The inner connector is connected to the lower connector; the outer connector and the upper connector are respectively connected to the first power source.

Images