CN103773942A - Thermal treatment device of field joint of steel containment of nuclear power plant and thermal treatment method - Google Patents
Thermal treatment device of field joint of steel containment of nuclear power plant and thermal treatment method Download PDFInfo
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- CN103773942A CN103773942A CN201410016677.4A CN201410016677A CN103773942A CN 103773942 A CN103773942 A CN 103773942A CN 201410016677 A CN201410016677 A CN 201410016677A CN 103773942 A CN103773942 A CN 103773942A
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Abstract
The invention relates to a thermal treatment device of a field joint of a steel containment of a nuclear power plant and a thermal treatment method, belonging to the technical field of construction of the nuclear power plant. The device mainly consists of a main framework (Z-1), heating insulators (Z-2), a traveling mechanism (Z-3), a temperature sensing apparatus (Z-4) and an automatic temperature controller (Z-5). During thermal treatment, the traveling mechanism of the thermal treatment device is supported at the upper edge of a wall plate of the containment and is moved along the upper edge, so that the heating insulators on both sides of the wall plate of the containment are located in a position for clamping the to-be-thermally-treated joint. Then, the temperature sensor is installed at the to-be-thermally-treated joint. After an electric heating apparatus is connected, under the closed loop control of the automatic temperature controller, the joint is heated to a predetermined temperature. According to the invention, the insulating cotton, the electric heating apparatus and the joint are compactly attached, and the joint quality is remarkably improved and the welding period is remarkably shortened by guaranteeing the thermal treatment quality and efficiency.
Description
Technical field
The present invention relates to a kind of steel containment vessel of nuclear power station the device of welding use is installed, especially a kind of steel containment vessel of nuclear power station site weld thermal treatment unit provides corresponding heat treating method simultaneously, belongs to Nuclear Power Station technical field.
Background technology
Reactor housing (CV), as the important component part of passive system, can effectively stop reactor housing internal pressure exceed design load and prevent that radioactive substance from leaking under accident conditions, is one of visual plant guaranteeing Nuclear Safety operation.AP1000 three generations steel containment vessel of nuclear power station is a stopping property steel container, comprise bottom (head), cylindrical shell and cover head three parts, form by the high tough SA738Gr.B steel plate butt welding of 40mm～50mm thick low-alloy, weld seam overall length is about 3400m, groove section is large, compare the heap such as CPR1000, EPR type Nuclear power plants, welding job amount has at least increased by 8 times.
Nuclear power is built very strict to the specification of quality of all weld seams of CV, and the compactness of welding joint, obdurability, welding deformation amount etc. are the quality index that must control and guarantee.Particularly, for preventing the welding crack of the high tough SA738Gr.B steel plate of 40mm～50mm thick low-alloy, eliminate the unrelieved stress of postwelding existence and guarantee welding joint comprehensive mechanical performance, the all weld seams of CV all need to take strictly, accurate thermal treatment process, mainly comprise weld preheating, the thermal treatment of postwelding stress-removal etc.
In the construction of all AP1000 nuclear power generating sets of China, thermal treatment work adopts flame baking method or simple support electrical heating method conventionally, has following problem at present:
1. flame baking method is the heating of cyclicity concentration of local, under the large objective condition of area of dissipation, the thermal treatment that adopts this method to carry out weld seam cannot realize being uniformly distributed and constantization of welding bead length, thickness direction thermal treatment temp, thermal treatment quality can not be guaranteed, and the time that is baked to specified temperature needs is long, and the inflammable gas of consumption is many.
2. simple support electrical heating method is that repeatability supports in welded joints fixing heat block and on heat block, lays insulating cotton, heat block and weld seam, insulating cotton and heat block can not fit tightly, thermal conduction and heat insulation effect are poor, and thermal treatment quality exists greater risk, and operating efficiency is low.
Summary of the invention
The technical problem to be solved in the present invention is: the problem existing for above-mentioned existing heat treatment technics, propose a kind of steel containment vessel of nuclear power station site weld thermal treatment unit that contributes to improve welding efficiency, guarantees to stablize welding quality, provide the steel containment vessel of nuclear power station site weld heat treating method by this device simultaneously.
In order to reach above object, basic technical scheme of the present invention is:
Steel containment vessel of nuclear power station site weld thermal treatment unit is mainly made up of main body framework (Z-1), heating warmer (Z-2), travel mechanism (Z-3), temperature sensor (Z-4), automatic temperature-controlled instrument (Z-5);
Described main body framework (Z-1) is mainly by least two root posts (1-11,1-12) of top band web plate (1-10), form every being fixed on crossbeam (1-21,1-22,1-23,1-24) between two root posts between the upper and lower;
Described heating warmer (Z-2) is mainly made up of electric heating device (2-R) and insulating cotton (2-W); The one side of described insulating cotton (2-W) has groove, and described electric heating device (2-R) is placed in groove and fits tightly, and wraps into overall with wire cloth (2-S);
Described travel mechanism (Z-3) by connect panel (3-1), from connect panel lower surface towards two couples walking limiting plate (3-2) of downward-extension, be installed on the force transmission shaft (3-4) between relative walking limiting plate top, and the walking roller (3-3) being enclosed within on force transmission shaft forms;
A main body framework (Z-1) is fixed respectively in connection panel (3-1) the lower surface both sides of described travel mechanism (Z-3), and the apparent surface of described main body framework installs respectively a heating warmer (Z-2);
The signal output part of described temperature sensor (Z-4) connects the corresponding ports of automatic temperature control instrument (Z-5), the control output end of described automatic temperature control instrument connects electric heating device, in order to according to the break-make of the comparative result control electric heating device of temperature sensor input temp value and default temperature control value.
Steel containment vessel of nuclear power station site weld heat treating method by apparatus of the present invention comprises the following steps:
The first step, the walking roller of described thermal treatment unit travel mechanism is supported on to the upper edge of reactor housing wallboard, makes two main body framework that are fixed with respectively heating warmer lay respectively at reactor housing wallboard surfaces externally and internally;
Second step, temperature sensor is placed in to vertical commissure to be heated;
The 3rd step, the mechanism that is movably walking along edge on annular reactor housing wallboard, make the heating warmer on reactor housing wallboard two sides in clamping the position of vertical weld seam to be heated;
The 4th step, connection electric heating device, under the closed-loop control of automatic temperature-controlled instrument, be heated to preset temperature by vertical weld seam.
Above-mentioned steps is welded the processing that preheats before as being applied to, after the 4th step, remove thermal treatment unit and be positioned at surface to be welded back portion, welds; As be applied to the destressing thermal treatment after welding, after the 4th step, thermal treatment unit is moved to next commissure.
It is that the apparent surface of described main body framework installs respectively a heating warmer (Z-2), and between main body framework and thermal insulation device, assigns movable force transmitting board (B-1, B-2, B-3) that thermal treatment unit of the present invention further improves; Between described two root posts (1-11,1-12), be provided with the vertical reinforced tube (1-31,1-32,1-33) being fixedly connected with crossbeam (1-21,1-22,1-23,1-24), on described reinforced tube, be intervally distributed with the inner and withstand the clamping screw of movable force transmitting board (G).
Corresponding further the improving of heat treating method of the present invention is, in described second step, also be included in vertical weld seam both sides and fixedly catch on respectively the jig at main body framework crossbeam two ends, until the heating warmer on wallboard two sides after clamping the position of vertical weld seam to be heated, tighten clamping screw, by holding out against activity power transmission steel plate, heating warmer and reactor housing wallboard are more fitted tightly.
Adopt device of the present invention to carry out the thermal treatment of steel containment vessel of nuclear power station site weld, there is following remarkable advantage with respect to existing flame baking method or simple support electrical heating method:
1. thennal conduction enhancement and heat insulation effect, guarantees that the temperature of whole piece welding bead length, width, thickness direction is evenly with constant, and thermal treatment quality can effectively improve;
2. apparatus structure is simple, easy for installation, and along the circumferential direction quick travel is to any weld seam to be heated, and thermal treatment construction efficiency improves greatly, and the production cycle of steel containment vessel of nuclear power station also shortens relatively.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is further illustrated.
Fig. 1 is steel containment vessel of nuclear power station one-piece construction schematic diagram.
Fig. 2 is the thermal treatment unit structural representation of one embodiment of the invention.
Fig. 3 is the main body framework perspective view in Fig. 2 embodiment.
Fig. 4 is spill jig and the Wedge device perspective view in Fig. 2 embodiment.
Fig. 5 is the heating warmer structural representation in Fig. 2 embodiment.
Fig. 6 is the activity power transmission steel plate position structural representation in Fig. 2 embodiment.
Fig. 6-1 is the B-B cross-sectional view of Fig. 6.
Fig. 7 is the travel mechanism perspective view in Fig. 2 embodiment.
Fig. 7-1 is the side-view of Fig. 7.
Fig. 8 is the fixing briquette structure schematic diagram in the thermopair working end in Fig. 2 embodiment.
Fig. 8-1 is the side-view of Fig. 8.
Fig. 9 is steel containment vessel of nuclear power station welded construction schematic diagram.
Fig. 9-1 is the use status architecture schematic diagram of Fig. 2 embodiment.
Embodiment
Referring to accompanying drawing explanation the preferred embodiments of the present invention.
As shown in Figure 1, the steel containment vessel of nuclear power station of the present embodiment (CV) comprises segment-shaped bottom (head), round tube type cylindrical shell and segment-shaped cover head three parts, and diameter is 39.6m.Wherein, bottom (head) and cover head form by high tough SA738Gr.B steel plate butt weldings of totally 64 hyperboloids.Cylindrical shell is made up of 11 circle wallboards, and every circle is formed by the high tough SA738Gr.B steel plate butt welding of 12 single curved surfaces, comprises 132 vertical weld seams (claiming again longitudinal joint) and 12 circumferential welds.Before all weld seam welderings, need to carry out thermal pretreatment, part weld seam postwelding need carry out stress-removal thermal treatment.
The weld preheating of the steel containment vessel of nuclear power station site weld of the present embodiment is processed and is adopted the thermal treatment unit shown in Fig. 2, comprises main body framework Z-1, heating warmer Z-2, travel mechanism Z-3, thermopair Z-4, automatic temperature-controlled instrument Z-5.Temperature sensor adopts thermopair Z-4, its signal output part meets automatic temperature control instrument Z-5(model WCK-240, the southeast, Wujiang welding and cutting device company limited manufacture) corresponding ports, the control output end of automatic temperature control instrument Z-5 connects electric heating device, by default parameter, heat treatment process is controlled and adjusted, in order to according to the break-make of the comparative result control electric heating device of temperature sensor input temp value and default temperature control value.
Main body framework Z-1 concrete structure as shown in Figure 3, the left and right border of main body framework Z-1 is two symmetrical corniform upright column 1-11,1-12 of top band web plate 1-10, and its outside surface is upper and lower four equal length square tube crossbeam 1-21,1-22,1-23, the 1-24 of being equidistantly welded with along its length.
Between two root post 1-11,1-12, be provided with vertical square tube 1-31,1-32, the 1-33 of putting more energy into of first, second and third row being connected with crossbeam 1-21,1-22,1-23,1-24 welding; The secondary series square tube 1-32 that puts more energy into is welded in the mid point of crossbeam, and all the other two row 1-31,1-33 are symmetrical as symmetry centre take secondary series 1-32, and all square tubes of putting more energy into are all intervally distributed with the inner withstands the clamping screw G of movable force transmitting board (referring to Fig. 6).
For the ease of settling, the present embodiment has been made the opening up spill jig K shown in a picture group 4, is weldingly fixed on vertical weld seam both sides when use, to catch on respectively the two ends of each crossbeam, and by wedge X wedging.
Heating warmer Z-2 as shown in Figure 5, comprise the electric heating block 2-R(track type ceramic electrical heating block as electric heating device, honest Electrical Appliances Co., Ltd manufactures) and insulating cotton 2-W, the one side of insulating cotton 2-W is groove shape, thickness leaves compression surplus, and its recess width and the degree of depth and electric heating block 2-R match, and electric heating block 2-R puts in the groove that is dissolved in insulating cotton 2-W just, after fitting tightly, wrap into overall with Stainless Steel Cloth 2-S.
As shown in Fig. 6 and Fig. 6-1, the put more energy into contact surface of square tube and heating warmer of three row of main body framework Z-1 is respectively equipped with activity power transmission steel plate B-1, B-2, the B-3 that three compacted screw rod G withstand.
Travel mechanism Z-3 is as shown in Fig. 7 and Fig. 7-1, comprise and connect panel 3-1, two couples of walking limiting plate 3-2, walking roller 3-3, force transmission shaft 3-4 from connection panel lower surface towards downward-extension, force transmission shaft 3-4 is installed between relative walking limiting plate top, and walking roller 3-3 is enclosed within on force transmission shaft.A main body framework Z-1 is fixed respectively in the connection panel 3-1 lower surface both sides of this travel mechanism Z-3, and the apparent surface of main body framework installs respectively a heating warmer Z-2.
In order to facilitate the arrangement of thermopair, the present embodiment has been made the fixing briquetting 4-10 of the fluting shown in Fig. 8 and Fig. 8-1, is welded on vertical weld seam one side when use, and the working end of thermopair Z-4 is inserted wherein.
As shown in Figure 9, first welding is the most all vertical weld seam of below N girth sheets for the steel containment vessel of nuclear power station welded construction of the present embodiment, then welds all vertical weld seam ZF-1---the ZF-12 of N+1 girth sheets, carries out afterwards the welding of circumferential weld HF between two circles.Carry out vertical weld seam welding forward and backward, need respectively butt welded seam to carry out thermal pretreatment and destressing thermal treatment.Heat treated step following (referring to Fig. 9-1):
The first step, the walking roller 3-3 of thermal treatment unit travel mechanism Z-3 is supported on to the upper edge of reactor housing wallboard Z, makes the two main body framework Z-1 that are fixed with respectively heating warmer Z-2 lay respectively at reactor housing wallboard Z surfaces externally and internally;
Second step, by the fixing briquetting 4-10 of three flutings between the upper and lower every three places, upper, middle and lower that are welded on vertical weld seam one side, respectively the working end of three thermopair Z-4 is assigned into respectively in the groove of each fixing briquetting 4-10;
The 3rd step, upper along being movably walking the Z-3 of mechanism along annular reactor housing wallboard Z, makes the heating warmer Z-2 on reactor housing wallboard Z two sides in clamping the position of vertical weld seam ZF-1 to be heated; Be welded and fixed respectively the opening up spill jig K that catches on the each crossbeam of main body framework Z-1 two ends in these vertical weld seam both sides, and by the each crossbeam of wedge X wedging; Tighten again and compress all screw rod G, by holding out against each activity power transmission steel plate, heating warmer Z-2 and reactor housing wallboard are fitted tightly;
The 4th step, manipulate automatic temperature-controlled instrument Z-5, connect heating warmer Z-2 electricity heating block, under the closed-loop control of automatic temperature-controlled instrument, vertical weld seam is heated to preset temperature.
For welding (automatic welding or manually weldering) thermal pretreatment before, the preheating temperature of setting automatic temperature-controlled instrument is 100～200 ℃, and heating rate is 200 ± 20 ℃/h; For the stress-removal thermal treatment after welding, the holding temperature of setting automatic temperature-controlled instrument is 595～615 ℃, and soaking time is 2 ± 0.1 hours; More than 425 ℃ time, 56 ℃/h≤rate temperature change (heating or rate of cooling)≤110 ℃/h.
Afterwards, unclamp wedge X, by walking roller, thermal treatment unit is moved to other weld seams along annular steel containment vessel wallboard circumferential direction, carry out successively weld seam ZF-2, ZF-3, ZF-4 with reference to above step ... the thermal treatment of ZF-12.
Facts have proved, adopt steel containment vessel of nuclear power station site weld thermal treatment unit and the heat treating method of the present embodiment to make to fit tightly between insulating cotton, electric heating device, weld seam, by guaranteeing thermal treatment quality and efficiency, significantly improve weldquality, shorten the welding duration.
It should be noted that, above-described embodiment is nonrestrictive, and many structures such as the geometric shape of thermal treatment unit can be carried out adaptability revision according to the profile feature of workpiece to be heated.
Claims (8)
1. a steel containment vessel of nuclear power station site weld thermal treatment unit, is characterized in that: be mainly made up of main body framework (Z-1), heating warmer (Z-2), travel mechanism (Z-3), temperature sensor (Z-4), automatic temperature-controlled instrument (Z-5);
Described main body framework (Z-1) is mainly by least two root posts (1-11,1-12) of top band web plate (1-10), form every being fixed on crossbeam (1-21,1-22,1-23,1-24) between two root posts between the upper and lower;
Described heating warmer (Z-2) is mainly made up of electric heating device (2-R) and insulating cotton (2-W); The one side of described insulating cotton (2-W) has groove, and described electric heating device (2-R) is placed in groove and fits tightly, and wraps into overall with wire cloth (2-S);
Described travel mechanism (Z-3) by connect panel (3-1), from connect panel lower surface towards two couples walking limiting plate (3-2) of downward-extension, be installed on the force transmission shaft (3-4) between relative walking limiting plate top, and the walking roller (3-3) being enclosed within on force transmission shaft forms;
A main body framework (Z-1) is fixed respectively in connection panel (3-1) the lower surface both sides of described travel mechanism (Z-3), and the apparent surface of described main body framework installs respectively a heating warmer (Z-2);
The signal output part of described temperature sensor (Z-4) connects the corresponding ports of automatic temperature control instrument (Z-5), the control output end of described automatic temperature control instrument connects electric heating device, in order to according to the break-make of the comparative result control electric heating device of temperature sensor input temp value and default temperature control value.
2. steel containment vessel of nuclear power station site weld thermal treatment unit according to claim 1, it is characterized in that: the apparent surface of described main body framework installs respectively a heating warmer (Z-2), and between main body framework and thermal insulation device, assign movable force transmitting board (B-1, B-2, B-3); Between described two root posts (1-11,1-12), be provided with the vertical reinforced tube (1-31,1-32,1-33) being fixedly connected with crossbeam (1-21,1-22,1-23,1-24), on described reinforced tube, be intervally distributed with the inner and withstand the clamping screw of movable force transmitting board (G).
3. the heat treating method of steel containment vessel of nuclear power station site weld thermal treatment unit described in employing claim 1, is characterized in that comprising the following steps:
The first step, the walking roller of described thermal treatment unit travel mechanism is supported on to the upper edge of reactor housing wallboard, makes two main body framework that are fixed with respectively heating warmer lay respectively at reactor housing wallboard surfaces externally and internally;
Second step, temperature sensor is placed in to vertical commissure to be heated;
The 3rd step, the mechanism that is movably walking along the upper edge of reactor housing wallboard, make the heating warmer on reactor housing wallboard two sides in clamping the position of vertical weld seam to be heated;
The 4th step, connection electric heating device, under the closed-loop control of automatic temperature-controlled instrument, be heated to preset temperature by vertical weld seam.
4. the heat treating method of steel containment vessel of nuclear power station site weld thermal treatment unit described in employing claim 2, is characterized in that comprising the following steps:
The first step, the walking roller of described thermal treatment unit travel mechanism is supported on to the upper edge of reactor housing wallboard, makes two main body framework that are fixed with respectively heating warmer lay respectively at reactor housing wallboard surfaces externally and internally;
Second step, temperature sensor is placed in to vertical commissure to be heated;
The 3rd step, the mechanism that is movably walking along edge on annular reactor housing wallboard, make the heating warmer on reactor housing wallboard two sides in clamping the position of vertical weld seam to be heated; Fixedly catch on respectively the jig at main body framework crossbeam two ends in vertical weld seam both sides, tighten clamping screw, by holding out against activity power transmission steel plate, heating warmer and reactor housing wallboard are fitted tightly;
The 4th step, connection electric heating device, under the closed-loop control of automatic temperature-controlled instrument, be heated to preset temperature by vertical weld seam.
5. the heat treating method of steel containment vessel of nuclear power station site weld thermal treatment unit according to claim 4, it is characterized in that: described jig is opening up spill jig, in described second step, spill jig is weldingly fixed on respectively to vertical weld seam both sides, catch on the two ends of each crossbeam, and by wedge wedging.
6. the heat treating method of steel containment vessel of nuclear power station site weld thermal treatment unit according to claim 4, it is characterized in that: described temperature sensor is thermopair, in described the 3rd step, at the fixing briquetting of vertical weld seam one side welding fluting, the working end of thermopair is inserted in the groove of fixing briquetting.
7. according to the heat treating method of steel containment vessel of nuclear power station site weld thermal treatment unit described in claim 5 or 6, it is characterized in that: described thermal treatment is the thermal pretreatment before welding, the preheating temperature that described automatic temperature-controlled instrument is set is 100～200 ℃, and heating rate is 200 ± 20 ℃/h.
8. according to the heat treating method of steel containment vessel of nuclear power station site weld thermal treatment unit described in claim 5 or 6, it is characterized in that: described thermal treatment is the stress-removal thermal treatment after welding, the holding temperature that described automatic temperature-controlled instrument is set is 595～615 ℃, soaking time is 2 ± 0.1 hours, and more than 425 ℃ time, 56 ℃/h≤rate temperature change≤110 ℃/h.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113667813A (en) * | 2021-07-20 | 2021-11-19 | 中国核工业第二二建设有限公司 | Post-welding stress relief method and device for steel containment vessel of nuclear power station |
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