CN213086050U - High-temperature heating surface welded junction and fin weld seam postweld heat treatment device - Google Patents
High-temperature heating surface welded junction and fin weld seam postweld heat treatment device Download PDFInfo
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- CN213086050U CN213086050U CN202021359243.1U CN202021359243U CN213086050U CN 213086050 U CN213086050 U CN 213086050U CN 202021359243 U CN202021359243 U CN 202021359243U CN 213086050 U CN213086050 U CN 213086050U
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Abstract
The utility model relates to a high temperature receives hot side weld bond and fin welding seam postweld heat treatment device, it belongs to high temperature and receives hot side weld bond and fin welding seam postweld heat treatment field. The utility model discloses heat treatment device is including accuse temperature thermocouple, host computer the control unit, thermal-insulated heat preservation device and electromagnetic induction coil, and the hot junction of accuse temperature thermocouple is arranged on weld seam and fin welding seam, and the cold junction of accuse temperature thermocouple links to each other with host computer the control unit, and electromagnetic induction coil sets up in thermal-insulated heat preservation device's top, is the helix direction and arranges to link to each other with host computer the control unit, weld seam and fin welding seam top and below all set up thermal-insulated heat preservation device. The utility model discloses can heat the position and be heated evenly, reduce the residual stress of welding seam by a wide margin, and improve heating efficiency's heating device simultaneously.
Description
Technical Field
The utility model relates to a device especially relates to a high temperature receives hot side weld bond and fin welding seam postweld heat treatment device for solve high temperature receive hot side weld bond and fin welding seam postweld heat treatment operation difficulty, the inhomogeneous problem of quality, for 650 ℃ and above ultra supercritical unit supplies a new device with high alloy fin and tube panel concatenation building site weld bond heat treatment.
Background
Along with the increase of the capacity of the thermal power generating unit, 9Cr high alloy steel (such as 10Cr9Mo1 VNb) is applied to a high-temperature heating surface tube bank of the supercritical thermal power generating unit in a large amount, when a tube panel with fins made of the steel is installed on a construction site, welding junctions and fin sealing welding seams of the high alloy are inevitably formed, after welding of the welding seams, post-welding heat treatment is needed, however, due to the limitation of space positions, after welding, the post-welding heat treatment of the welding junctions and the fins by adopting a traditional ceramic heater heating mode is difficult to ensure the temperature balance of each welding junction and each fin, the hardness of the welding junctions and the welding seams of the fins of the high-temperature heating surface exceeds the standard, and the leakage of the high-temperature heating surface can be caused when the hardness of the welding junctions and the fin welding.
The high alloy steel welding seam can reduce the residual stress of welding, prevent the generation of welding defects and improve the structure and performance of the welding seam through effective pre-welding preheating and post-welding heat treatment.
Therefore, it is particularly necessary to provide a heat treatment apparatus which has a reasonable structural design, uniformly heats the heating part, greatly reduces the residual stress of the weld joint, and simultaneously improves the heating efficiency.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the above-mentioned not enough that exists among the prior art, and provide a structural design is reasonable, safe and reliable, convenient operation, heating position is heated evenly, reduces the residual stress of welding seam by a wide margin, and improves the high temperature of heating efficiency simultaneously and receives hot side weld bond and fin welding seam postweld heat treatment device.
The utility model provides a technical scheme that above-mentioned problem adopted is: the postweld heat treatment device for the high-temperature heating surface weld craters and the fin weld seams comprises a temperature control thermocouple and a host control unit, wherein the hot end of the temperature control thermocouple is arranged on the weld craters and the fin weld seams, and the cold end of the temperature control thermocouple is connected with the host control unit; the method is characterized in that: the electromagnetic induction coil is arranged above the heat insulation device, is arranged in a spiral line direction and is connected with the host control unit, and the heat insulation device is arranged above and below the welded junction and the welding seam of the fins.
Preferably, the temperature control thermocouple adopts one of a K-index thermocouple, a WRN thermocouple, a WRNK thermocouple or a welding type thermocouple, and the material is nickel-chromium-nickel-silicon or nickel-chromium-nickel-aluminum.
Preferably, the heat insulation device of the utility model adopts an aluminum silicate fiber needled blanket.
Preferably, the electromagnetic induction coil adopts stranded copper aluminium wire to make, and the periphery of wire has the phlogopite inlayer, and the outer periphery of phlogopite is wrapped up by the high temperature resistant adhesive tape that glass silk fibre was woven and is formed.
Preferably, the electromagnetic induction coil adopts the transverse magnetic flux design to arrange in one side of heating the work piece.
Preferably, the host control unit adopts inverter drive circuit's IGBT induction heating power.
As preferred, host computer control unit controls electromagnetic induction coil's output according to the temperature of accuse temperature thermocouple control, guarantees that the temperature of crater and fin welding seam accords with the technology according to predetermined technological parameter.
Compared with the prior art, the utility model, have following advantage and effect: (1) the electric heating postweld heat treatment can be simultaneously carried out on the welded junction and the fin sealing weld joint, the times and time of the postweld heat treatment are reduced compared with the traditional ceramic heater, the requirements of the postweld heat treatment on the heating temperature and the heat preservation time of the high-temperature heating surface welded junction and the fin sealing weld joint can be met, the heating speed is high, the heat utilization rate is high, the energy is saved remarkably, the use is safe and reliable, and the product quality is ensured; (2) the transverse magnetic flux design is adopted to be arranged on one side of a heating workpiece, the weld crater and the sealing fin weld seam are heated on one side and insulated on two sides, the operation and adjustment are convenient, the universality is strong, the postweld heat treatment of the weld crater with the pipe diameter being below 45mm and the wall thickness being below 8mm and the sealing weld seam with the fin thickness being below delta 6mm can be adapted, and the construction cost is greatly saved.
Drawings
FIG. 1 is a first schematic structural view of a heat treatment apparatus according to an embodiment of the present invention.
FIG. 2 is a schematic structural view of a heat treatment apparatus according to an embodiment of the present invention.
In the figure: the device comprises a temperature control thermocouple 1, a heat insulation device 2, an electromagnetic induction coil 3, a host control unit 4, a to-be-processed welded junction 5 and a to-be-processed fin welded joint 6.
Detailed Description
The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not intended to limit the present invention.
Examples are given.
Referring to fig. 1 to 2, the high-temperature heating surface crater and fin weld seam postweld heat treatment device of the embodiment includes a temperature control thermocouple 1, a heat insulation device 2, an electromagnetic induction coil 3 and a host control unit 4; in fig. 1, a welding opening 5 to be processed and a fin welding seam 6 to be processed are also arranged.
The hot end of the temperature-control thermocouple 1 of the embodiment is arranged on the weld crater and the fin weld joint, and the cold end of the temperature-control thermocouple 1 is connected with the host control unit 4.
The temperature control thermocouple 1 is one of a K-index thermocouple, a WRN thermocouple, a WRNK thermocouple or a welding type thermocouple, and is made of nickel-chromium-nickel-silicon or nickel-chromium-nickel-aluminum; welding is performed on the representative crater and fin seal welds in a welding pattern.
The heat insulation device 2 of the embodiment is attached above and below the weld craters and the fin weld seams, and plays a role in heat insulation for the weld craters and the fin weld seams.
The heat insulation device 2 adopts the aluminum silicate fiber needled blanket, has excellent heat insulation performance, light weight, temperature resistance up to 1000 ℃ and high heat efficiency; the aluminum silicate needle felt is generally set to have a cross-sectional dimension of 20mm on the heating surface side and 60mm or more on the heat-insulating surface side, and the plane dimension thereof can be adjusted according to the number of craters to be subjected to post-weld heat treatment and the size of the fin area.
The electromagnetic induction coil 3 of the present embodiment is arranged above the heat insulation and preservation device 2, arranged in a spiral direction, and connected to the host control unit 4.
The electromagnetic induction coil 3 is made of a plurality of strands of copper-aluminum metal wires, the periphery of each metal wire is wrapped by a phlogopite inner layer, and the periphery of the phlogopite outer layer is wrapped by a high-temperature-resistant adhesive tape woven by glass fiber; the wire diameter is generally set to be 20-30mm, the wire can bear the temperature of more than 200 ℃, and the wire can be conveniently arranged on a heating workpiece; the induction coil is arranged on one side of the heating workpiece in a transverse magnetic flux design, and the arrangement mode avoids the defect that a heater is not easy to arrange on the top surface when the ground is combined and welded, so that the field construction efficiency is high.
In this embodiment, the host control unit 4 controls the output power of the electromagnetic induction coil 3 according to the temperature monitored by the thermocouple and the preset process parameters, so as to ensure that the temperatures of the craters and the fin welds conform to the process.
In this embodiment, the host control unit 4 adopts an inverter driving circuit IGBT induction heating power supply, which has a high workpiece heating speed, a large heating depth, and a high thermal efficiency conversion rate.
The process setting of the embodiment is as follows: and setting parameters of the host control unit 4 according to the heat treatment process card, starting operation, controlling the temperature difference of temperature measuring points of the thermocouples not to be more than 30 ℃ in the heat treatment process, and turning off the intermediate frequency input power supply after the whole heat treatment is finished.
The high alloy 10Cr9Mo1VNb tube row of this embodiment that needs to be subjected to welding heat treatment has a crater specification of phi 38 × 6mm, a fin thickness of δ =6mm, 10 craters in total, and 9 fin sealing welds need post-welding heat treatment.
The required power and the number of turns of the coil are calculated according to power factors of a heating unit of a host, the turn-to-turn size of the coil is calculated according to the heating area of a welding opening and a sealing fin, the section size of the aluminum silicate needled felt on the heating side is 20mm, the section size of the aluminum silicate needled felt on the heat preservation side is 60mm, the thermocouple is a K-index welding type thermocouple which is made of nickel-chromium-nickel-silicon and has the WRNK model and the length L =1000 mm.
The manufacturing process of the high-temperature heating surface welded junction and fin welded seam post-weld heat treatment device of the embodiment is as follows:
(1) fixing a temperature-control thermocouple 1: fixing the hot end of the crater temperature sampling thermocouple on a representative crater in a spot welding mode, wherein the direction of the temperature control thermocouple 1 is vertical to the axial direction of the crater; fixing the hot end of a fin sealing weld sampling temperature-control thermocouple 1 on a representative sealing weld in a spot welding mode, wherein the trend of the temperature-control thermocouple 1 is parallel to the axial direction of a weld crater; the contact must be good and the cold end is placed outside the insulation wool.
(2) Laying a heat insulation device 2: the heat preservation material is laid around the weld seam of the welded junction and the fin, and the cold end of the temperature control thermocouple 1 is ensured to be exposed out of the heat preservation layer, wherein the cross section of the aluminum silicate needled felt on the heating side is 20mm, the cross section of the aluminum silicate needled felt on the heat preservation side is 60mm, the aluminum silicate needled felt is bound by adopting a glass ribbon or an iron wire, and when the iron wire is bound, the iron wire and the electromagnetic induction coil 3 are required to be subjected to heat insulation and insulation.
(3) Mounting the electromagnetic induction coil 3: arranging a high-temperature-resistant cable on an electromagnetic induction coil 3 which is laid above a heating-side heat insulation layer by taking a welding seam as a center to form a spiral line in a spiral line mode, wherein the heating width is required to completely cover a welding opening to be heated and a sealing fin, and the number of turns of the high-temperature-resistant cable laid on the outer side of a heating-side aluminum silicate needle felt is calculated according to a host control unit 4; the electromagnetic induction coil 3 is a medium frequency electromagnetic induction coil 3.
(4) Line connection: the electromagnetic induction coil 3 is connected with a host control unit 4, the temperature control thermocouples 1 are connected with the host control unit 4 by adopting compensation wires, parameters of the host control unit 4 are set according to a heat treatment process card, the operation is started, the temperature difference of temperature measuring points of the temperature control thermocouples 1 is controlled not to be more than 30 ℃ in the heat treatment process, and an intermediate frequency input power supply is turned off after the whole heat treatment is finished.
This embodiment can make the pipe diameter below 45mm and the weld crater below 8mm of wall thickness and the postweld heat treatment of the sealing weld below fin thickness delta 6mm after the building site welding ends, can heat the position through adopting the heating device and be heated evenly, reduces the residual stress of welding seam by a wide margin, and improves heating efficiency's heating device simultaneously.
The high-temperature heating surface weld crater and the fin weld seam which need to be subjected to postweld heat treatment are positioned below the heat insulation and preservation device 2, the heat insulation and preservation device 2 is positioned below the electromagnetic induction coil 3, and the electromagnetic induction coil 3 is controlled by the host control unit 4 to heat, preserve heat and reduce the temperature of the part to be treated according to the preset heating and cooling speed and heat preservation time.
Wherein, the high temperature heating surface welding mouth and the fin welding seam which need to be processed with postweld heat treatment are provided with a temperature control thermocouple 1, and the temperature control thermocouple 1 is connected with a host control unit 4 through a compensating lead.
And will be apparent to those skilled in the art from the foregoing description.
In addition, it should be noted that the specific embodiments described in the present specification may be different in the components, the shapes of the components, the names of the components, and the like, and the above description is only an example of the structure of the present invention. All the equivalent changes or simple changes made according to the structure, characteristics and principle of the utility model are included in the protection scope of the utility model. Various modifications, additions and substitutions may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.
Claims (6)
1. A postweld heat treatment device for a high-temperature heating surface welded junction and a fin weld joint comprises a temperature control thermocouple (1) and a host control unit (4), wherein the hot end of the temperature control thermocouple (1) is arranged on the welded junction and the fin weld joint, and the cold end of the temperature control thermocouple (1) is connected with the host control unit (4); the method is characterized in that: still include thermal-insulated heat preservation device (2) and electromagnetic induction coil (3), electromagnetic induction coil (3) set up in the top of thermal-insulated heat preservation device (2), are the helix direction and arrange to link to each other with host computer control unit (4), weld joint and fin welding seam top and below all set up thermal-insulated heat preservation device (2).
2. The high-temperature heated surface crater and fin weld seam post-weld heat treatment device of claim 1, characterized in that: the temperature control thermocouple (1) adopts one of a K-index thermocouple, a WRN thermocouple, a WRNK thermocouple or a welding type thermocouple.
3. The high-temperature heated surface crater and fin weld seam post-weld heat treatment device of claim 1, characterized in that: the heat insulation device (2) adopts an aluminum silicate fiber needled blanket.
4. The high-temperature heated surface crater and fin weld seam post-weld heat treatment device of claim 1, characterized in that: the electromagnetic induction coil (3) is made of a plurality of strands of copper-aluminum metal wires.
5. The high-temperature heating surface crater and fin weld seam post-weld heat treatment device according to claim 1 or 4, characterized in that: the electromagnetic induction coil (3) is arranged on one side of the heating workpiece by adopting a transverse magnetic flux design.
6. The high-temperature heated surface crater and fin weld seam post-weld heat treatment device of claim 1, characterized in that: the host control unit (4) adopts an IGBT induction heating power supply of an inverter driving circuit.
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| CN202021359243.1U CN213086050U (en) | 2020-07-13 | 2020-07-13 | High-temperature heating surface welded junction and fin weld seam postweld heat treatment device |
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| CN202021359243.1U CN213086050U (en) | 2020-07-13 | 2020-07-13 | High-temperature heating surface welded junction and fin weld seam postweld heat treatment device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111979400A (en) * | 2020-07-13 | 2020-11-24 | 华电电力科学研究院有限公司 | High-temperature heating surface welded junction and fin weld seam postweld heat treatment device and manufacturing method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111979400A (en) * | 2020-07-13 | 2020-11-24 | 华电电力科学研究院有限公司 | High-temperature heating surface welded junction and fin weld seam postweld heat treatment device and manufacturing method |
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