CN116642173A - Method for installing water cooling wall of circulating fluidized bed boiler - Google Patents
Method for installing water cooling wall of circulating fluidized bed boiler Download PDFInfo
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- CN116642173A CN116642173A CN202310685214.6A CN202310685214A CN116642173A CN 116642173 A CN116642173 A CN 116642173A CN 202310685214 A CN202310685214 A CN 202310685214A CN 116642173 A CN116642173 A CN 116642173A
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- 238000000034 method Methods 0.000 title claims abstract description 60
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims description 19
- 238000001816 cooling Methods 0.000 title description 16
- 238000003466 welding Methods 0.000 claims abstract description 142
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 32
- 238000009434 installation Methods 0.000 claims description 20
- 229910052786 argon Inorganic materials 0.000 claims description 16
- 229910000831 Steel Inorganic materials 0.000 claims description 11
- 239000010959 steel Substances 0.000 claims description 11
- 238000005516 engineering process Methods 0.000 claims description 7
- 238000005520 cutting process Methods 0.000 claims description 5
- 238000012360 testing method Methods 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 4
- 238000012937 correction Methods 0.000 claims description 4
- 230000009191 jumping Effects 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 15
- 238000002485 combustion reaction Methods 0.000 description 10
- 230000008569 process Effects 0.000 description 6
- 239000003245 coal Substances 0.000 description 3
- 230000035515 penetration Effects 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 239000011324 bead Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000037452 priming Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/10—Water tubes; Accessories therefor
- F22B37/20—Supporting arrangements, e.g. for securing water-tube sets
- F22B37/201—Suspension and securing arrangements for walls built-up from tubes
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
The invention relates to the technical field of energy-saving and environment-friendly construction, and particularly provides a method for installing a water-cooled wall of a circulating fluidized bed boiler, which comprises the following steps: step 1, setting a platform and a reinforcing truss; step 2, welding pipes and fins of an upper left wall, an upper front wall, an upper right wall, an upper rear wall, a lower left wall, a lower front wall, a lower right wall and a lower rear wall of the water-cooled wall on a platform, and preparing the water-cooled wall of each section before combination; step 3, sequentially installing an upper left wall, an upper front wall, an upper rear wall, an upper right wall, a lower left wall, a lower front wall, a lower rear wall and a lower right wall; and 4, butt welding the water-cooled walls of each section, so that the problems of large-area construction sites and large hoisting machinery are effectively solved when the water-cooled walls of the circulating fluidized bed boiler are installed in the prior art, the purposes of saving the large-area construction sites, reducing the use of the large hoisting machinery and ensuring the construction quality on the premise of accelerating the construction progress are achieved.
Description
Technical Field
The invention relates to the technical field of energy-saving and environment-friendly construction, in particular to a method for installing a water-cooled wall of a circulating fluidized bed boiler.
Background
The circulating fluidized bed boiler technology is a high-efficiency low-pollution clean combustion technology which is rapidly developed in more than ten years, and the circulating fluidized bed combustion is a combustion mode between the conventional fluidized bed combustion and the pulverized coal pneumatic conveying combustion, can use the combustion of more coal types, and has NO at the same time X Low discharge, capability of realizing direct desulfurization in the combustion process, wide fuel adaptability, high combustion efficiency, large load adjusting range and the like, and has become the first-choice furnace type for the current clean combustion of coal.
The water cooling wall is the main heated part of the boiler, consists of a plurality of rows of steel pipes, is distributed around the boiler hearth, is filled with flowing water or steam, and receives the heat of the flame of the boiler hearth from the outside. Mainly absorbs the radiant heat of high-temperature combustion products in the hearth, and the working medium moves upwards in the hearth and is heated and evaporated.
At present, the water-cooled wall is installed in a whole piece, the lifting difficulty is high, the water-cooled wall is easy to bend in the lifting process, the patent application number is CN202110598308.0, the name is a method for installing the water-cooled wall of a boiler, and the method for respectively lifting the front wall, the rear wall, the left wall and the right wall of the water-cooled wall is required, but a large-area construction site and a large lifting machine are required.
Disclosure of Invention
The invention provides a method for installing a water-cooled wall of a circulating fluidized bed boiler, which is used for solving the problems of large-area construction sites and large hoisting machinery in the prior art when the water-cooled wall of the circulating fluidized bed boiler is installed, saving the large-area construction sites, reducing the use of the large hoisting machinery and simultaneously ensuring the construction quality on the premise of accelerating the construction progress.
The invention provides a method for installing a water-cooling wall of a circulating fluidized bed boiler, which comprises the following steps:
step 1, setting a platform according to the size of a water-cooled wall, and manufacturing a reinforced truss;
step 2, welding pipes and fins of an upper left wall, an upper front wall, an upper right wall, an upper rear wall, a lower left wall, a lower front wall, a lower right wall and a lower rear wall of the water-cooled wall on a platform, and preparing the water-cooled wall of each section before combination;
step 3, sequentially hanging and fixing the upper left wall, the upper front wall, the upper rear wall, the upper right wall, the lower left wall, the lower front wall, the lower rear wall and the lower right wall on the reinforced truss;
and 4, butt welding the water-cooled walls of each section.
According to the method for installing the water-cooled wall of the circulating fluidized bed boiler, provided by the invention, the following steps are adopted: the reinforced truss of the step 1 comprises upright posts, cross beams and inclined supports, a plurality of cross beams are fixedly connected between the upright posts, the inclined supports are fixedly connected between the cross beams, and the platform of the step 1 is made of channel steel.
According to the method for installing the water-cooled wall of the circulating fluidized bed boiler, the step 2 also comprises the following steps:
step 201, checking the width, diagonal and flatness of each section of water-cooled wall;
step 202, adjusting the part which does not meet the regulation;
and 203, performing a ball passing test by using a steel ball.
According to the method for installing the water-cooled wall of the circulating fluidized bed boiler, in the step 202, when the width is larger or smaller than the fixed size, the welding seams among the fins are cut off and properly adjusted to reach the specified size; when the diagonal difference exceeds 10mm, cutting off partial inter-fin welding seams of the edge part with the larger size, reducing the inter-fin welding seams to the diagonal difference of less than or equal to 10mm, and welding; and when the flatness of the pipe exceeds the allowable range, correcting by adopting a portal frame by using a jack.
According to the method for installing the water-cooled wall of the circulating fluidized bed boiler, the step 4 further comprises the following steps:
step 401, checking and correcting the pipe orifices in upper and lower groups, and comprehensively measuring the gap of the welding orifice;
step 402, fixing the nozzles of the upper and lower groups of pairs by using movable pipe clamps;
step 403, performing temporary spot welding on pipe orifices of the upper and lower groups, welding a weld junction with a moderate weld junction gap during spot welding, and properly adjusting the weld junction change which is too large or too small due to weld junction shrinkage during the spot welding when welding other weld junctions;
and 404, performing assembly welding after correction.
According to the method for installing the water-cooled wall of the circulating fluidized bed boiler provided by the invention, the step 404 further comprises the following steps:
step 4041, performing backing welding on the pipe orifices of each upper and lower group;
step 4042, performing face welding on the nozzles of each upper and lower group of nozzles.
According to the method for installing the water-cooled wall of the circulating fluidized bed boiler, in the step 4041, the backing welding is performed by argon arc welding, the welding is performed from left to right, 1 blank is welded, and the jumping is performed.
According to the installation method of the circulating fluidized bed boiler water-cooled wall, in the step 4042, the welding method of argon arc covers is adopted, a double-sided welding technology is adopted, two welders are closely matched for welding each opposite interface, firstly, the welder on the surface A starts to weld from the first arc starting point in the anticlockwise direction, does not need to stop arc when welding to the second arc starting point, the welder on the surface B starts to arc immediately, welds to the second arc starting point in the anticlockwise direction, then the welder on the surface A starts to weld from the first arc starting point in the clockwise direction, does not need to stop arc when welding to the third arc starting point, and the welder on the surface A starts to arc immediately, thereby completing the welding of the whole welding neck in the anticlockwise direction.
According to the method for installing the water-cooling wall of the circulating fluidized bed boiler, provided by the invention, the pipes and the fins of the water-cooling wall are welded on the platform manufactured in advance, the water-cooling wall is preliminarily fixed through the fixing truss during hoisting, the upper half part is firstly installed according to the installation sequence from top to bottom during installation, the lower half part of the water-cooling wall is installed according to the left-front-right order, the installation sequence of the lower half part is the same as that of the upper plate part, and the installation method is different from the traditional integral installation, so that the problems that a large-area construction site and a large hoisting machine are required during the installation of the water-cooling wall of the circulating fluidized bed boiler in the prior art are effectively solved, the purposes of saving the large-area construction site, reducing the use of the large hoisting machine and simultaneously ensuring the construction quality on the premise of accelerating the construction progress are achieved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the following description will briefly explain the embodiments or the drawings needed in the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the invention and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for installing a water wall of a circulating fluidized bed boiler provided by the invention;
FIG. 2 is a flow chart of a step 2 of the installation method of the water-cooled wall of the circulating fluidized bed boiler;
FIG. 3 is a flow chart of the method step 4 for installing the water wall of the circulating fluidized bed boiler;
FIG. 4 is a flowchart of the method step 404 of installing a water wall of a circulating fluidized bed boiler provided by the invention;
FIG. 5 is a schematic view of a water wall of the circulating fluidized bed boiler water wall installation method provided by the invention;
FIG. 6 is a schematic view of a fixed truss in the method for installing a water wall of a circulating fluidized bed boiler provided by the invention;
FIG. 7 is a schematic diagram of the sequence of the bottom welding of the installation method of the water wall of the circulating fluidized bed boiler;
FIG. 8 is a schematic diagram of the surface welding sequence of the installation method of the water-cooled wall of the circulating fluidized bed boiler;
reference numerals: 1. a water cooling wall; 11. a tube; 12. fins; 13. a pipe orifice; 2. fixing the truss; 21 stand columns; 22. a cross beam; 23. a diagonal support; 31. a first arc starting point; 32. a second arc starting point; 33. and a third starting point.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the embodiments of the present invention, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely for convenience in describing the embodiments of the present invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In describing embodiments of the present invention, it should be noted that, unless explicitly stated and limited otherwise, the terms "coupled," "coupled," and "connected" should be construed broadly, and may be either a fixed connection, a removable connection, or an integral connection, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in embodiments of the present invention will be understood in detail by those of ordinary skill in the art.
In embodiments of the invention, unless expressly specified and limited otherwise, a first feature "up" or "down" on a second feature may be that the first and second features are in direct contact, or that the first and second features are in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the embodiments of the present invention. In this specification, schematic representations of the above terms are not directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
The technical solution of the present invention is described below with reference to the embodiments shown in fig. 1 to 8:
the embodiment of the invention provides a method for installing a water-cooled wall of a circulating fluidized bed boiler, wherein the water-cooled wall 1 comprises a pipe 11 and fins 12, the pipe 11 is fixedly connected with the fins 12, and the method for installing the water-cooled wall of the circulating fluidized bed boiler comprises the following steps:
step 1, setting a platform according to the size of a water-cooled wall 1, and manufacturing a reinforced truss;
step 2, welding a left wall, an upper front wall, an upper right wall, an upper rear wall, a lower left wall, a lower front wall, a lower right wall and a lower rear wall of the water-cooled wall 1 on a platform, and preparing the water-cooled wall 1 of each section before combination;
step 3, sequentially hanging and fixing the upper left wall, the upper front wall, the upper rear wall, the upper right wall, the lower left wall, the lower front wall, the lower rear wall and the lower right wall on the reinforced truss;
and 4, butt welding the water-cooled walls 1 of each section.
It can be understood that the platform can only support the water-cooled wall 1, the platform can also use I-steel, the reinforcing truss can only support and fix the water-cooled wall 1 during installation, and reinforcing ribs can be added between the cross beams 22.
In the method for installing the water-cooling wall of the circulating fluidized bed boiler provided by the embodiment of the invention, as shown in the flow chart of fig. 1, because the area of the water-cooling wall 1 is large, in order to prevent the combination deformation, a platform for combining the water-cooling wall 1 is firstly required to be manufactured according to the size of the water-cooling wall 1, as shown in fig. 5, a pipe 11 and a fin 12 of the water-cooling wall 1 are welded on the platform, and in the process of welding the fin 12 of the water-cooling wall 1, as the length of a welding seam of a sealing element is long and is arranged in parallel, the welding is carried out in sections when the length of the welding seam is more than 1m, the connection welding between a pressure-bearing member and a non-pressure-bearing member is noted, and the welding line energy is required to be strictly according to the process evaluation so as to avoid the welding seam edge or the too wide molten pool, and the molten pool at the arc is filled up by the method of spot welding; when the water-cooled wall 1 is hung and installed, the upper half part is installed firstly through the installation sequence from top to bottom, the water-cooled wall 1 is installed according to the left, front, rear and right sequence, the installation sequence of the lower half part is the same as that of the upper plate part, and finally the upper half part and the lower half part of the water-cooled wall 1 are welded.
According to the method for installing the water-cooled wall of the circulating fluidized bed boiler, provided by the embodiment of the invention, the reinforcing truss in the step 1 comprises the upright posts, the cross beams 22 and the inclined supports 23, a plurality of cross beams 22 are fixedly connected between the upright posts, the inclined supports 23 are fixedly connected between the cross beams 22, and the platform in the step 1 is made of channel steel.
As shown in fig. 6, the reinforcement truss includes 6 cross beams 22 fixedly connected between the upright posts, the cross beams 22 and the inclined struts 23,2, and the inclined struts 23 are fixedly connected between every two cross beams 22, so that the strength of the whole reinforcement truss is enhanced.
According to the method for installing the water-cooled wall of the circulating fluidized bed boiler, the step 2 further comprises the following steps:
step 201, checking the width, diagonal and flatness of each section of water-cooled wall 1;
step 202, adjusting the part which does not meet the regulation;
and 203, performing a ball passing test by using a steel ball.
As shown in fig. 2, before the water-cooled walls 1 are assembled and installed, the width, diagonal line and flatness of each section of the water-cooled walls 1 are checked and adjusted, ball passing tests are carried out before and after the assembly of each section of the water-cooled walls 1, the test balls adopt steel balls, the steel balls are numbered, the steel balls are strictly prevented from being left in the pipe, and the installation of the water-cooled walls 1 is ensured to meet the requirements.
According to the method for installing the water-cooled wall of the circulating fluidized bed boiler provided by the embodiment of the invention, in the step 202, when the width is larger or smaller than the specified size, the welding seams among the fins 12 are cut off and properly adjusted to reach the specified size; when the diagonal difference exceeds 10mm, cutting off the welding seam between the fins 12 of the larger end edge part, reducing the welding seam to the diagonal difference less than or equal to 10mm, and then welding; when the flatness of the pipe 11 exceeds the allowable range, correction is performed by using a jack using a gantry.
As shown in fig. 2, after each section of the water-cooled wall 1 is inspected, the unqualified part is adjusted, the width and diagonal line of the unqualified part are adjusted by cutting the welding seams among the fins 12, and the flatness of the pipe 11 is adjusted by a portal frame and a jack, so that the installation of the water-cooled wall 1 meets the requirements.
According to the method for installing the water-cooled wall of the circulating fluidized bed boiler, the step 4 further comprises the following steps:
step 401, checking and correcting the pipe orifices 13 of the upper and lower pairs, and comprehensively measuring the gap of the welding orifice;
step 402, fixing the nozzles 13 of the upper and lower pairs by using movable pipe clamps;
step 403, performing temporary spot welding on the pipe orifices 13 of the upper and lower groups, welding the weld junction with moderate weld junction gap during spot welding, and properly adjusting the weld junction change which is too large or too small due to the shrinkage of the weld junction during the spot welding when welding other weld junctions;
and 404, performing assembly welding after correction.
As shown in fig. 3, after the water-cooled pipes are hoisted and combined, the pipe orifices 13 of the upper and lower assembly are inspected and corrected, and the gap between welded junctions is comprehensively measured, so that the pipe orifices 11 of the water-cooled wall 1 meet the standard requirements and welding conditions, before welding is started, the pipe orifices 13 of the upper and lower assembly are fixed by movable pipe clamps for convenient welding operation, when the upper and lower pipe orifices are assembled, the fins 12 on both sides of the pipe 11 can be cut by gas cutting for 100mm for improving the assembly efficiency, after the pipe orifices are welded, the pipe orifices are welded together with the fins 12, in order to prevent the deformation of the water-cooled wall pipe during welding, the pipe orifices 13 of the upper and lower assembly are firstly welded, the welded junctions with moderate gap between welded junctions are welded firstly, then other welded junctions are welded, the junction changes caused by shrinkage of the welded junctions are properly adjusted in the spot welding process, then the assembly welding is performed, the water-cooled wall 1 is severely damaged in the whole assembly welding process, the water-cooled wall 1 is not welded at will, and the bracket is not welded at will, if the assembly is temporarily fixed, the clamp and the assembly size of the water-cooled wall 1 is not found in the assembly process;
the water-cooled wall 1 is a main evaporating pipe heating surface of the boiler, and from the welding perspective, the following measures for preventing pipe explosion accidents should be adopted:
1. the forced assembly is forbidden in the pipe orifice 13 combination and the assembly is carried out by a thermal expansion method so as to reduce the stress of a welded junction;
2. when the membrane wall pipe group is used for butt welding, the positioning pipe orifice 13 is welded firstly, and other welded junctions are welded by adopting a jump welding method, so that welding deformation (bending at the welded junctions) and welding stress concentration are reduced;
3. the staggered edge quantity and the bending of the pipe orifice 13 group pair cannot exceed the standard requirement, so that uneven water flow distribution caused by uneven water flow resistance due to unequal sectional areas in the pipe can be avoided;
4. the weld seam undercuts (depth, length) must not exceed the standard specification.
According to the method for installing the water-cooled wall of the circulating fluidized bed boiler provided by the embodiment of the invention, the step 404 further comprises the following steps:
step 4041, performing backing welding on the pipe orifices 13 of each upper and lower group;
step 4042, performing face welding on the nozzles 13 of each upper and lower group.
As shown in fig. 4, during assembly welding, positioning pipes are welded firstly during assembly, each water-cooled wall 1 is subjected to argon arc welding priming, all welding is finished, the welding is completed through size duplicate inspection, then cover welding is carried out, and during cover welding, welding is carried out by adopting a skip welding method.
According to the method for installing the water-cooled wall of the circulating fluidized bed boiler provided by the embodiment of the invention, in step 4041, the backing welding is performed by argon arc welding, the double-sided welding technology is adopted, the welding is performed from left to right, 1 welding is performed in 1 space, and jumping is performed.
As shown in FIG. 7, argon arc welding is adopted for backing welding of the water wall 1, 1 blank 1 is welded, jumping is carried out, the welding sequence and the forming are as shown in FIG. 4, the welding sequence is 01, 02, 03, 04, 05, 06, 07, 08 and 09, the penetration welding is ensured during backing welding, the root is flat, and the phenomenon of protruding weld flash and concave is avoided so as to prevent the change of the resistance of the fluid section.
The argon arc welding is adopted for backing welding, welding slag can not be generated in the argon arc welding, slag cleaning and welding bead cleaning are not needed, welding efficiency can be improved by 2 to 4 times, the root can be good in penetration through the argon arc welding, the penetration is uniform, the surface is smooth and neat, and the smooth and neat argon arc welding backing layer is very beneficial to subsequent cover welding.
According to the installation method of the circulating fluidized bed boiler water wall provided by the embodiment of the invention, in step 4042, the welding method of argon arc covers is adopted for cover welding, two welders are closely matched for welding each group of interfaces, firstly, the welder on the surface A starts to weld from the first arc starting point 31 in the anticlockwise direction, does not need to stop arc when welding to the second arc starting point 32, the welder on the surface B starts to weld at the arc starting point immediately in the anticlockwise direction, then the welder on the surface A starts to weld from the first arc starting point 31 in the clockwise direction, the welder on the surface A does not need to stop arc when welding to the third arc starting point 33, and the welder on the surface A immediately starts to weld the whole welding port in the anticlockwise direction.
As shown in FIG. 8, the welding method of argon arc cover surface is adopted in cover welding of the water-cooled wall 1 pipe, the measure of preventing welding deformation on site is to adopt a reasonable welding sequence, the joint restraint degree is overlarge due to rigid fixation, larger welding residual stress is generated, a double-sided welding technology is adopted, welding is started from a first arcing point 31 of the A surface along the anticlockwise direction, when the welding is carried out to a second arcing point 32, a welder on the B surface does not need to stop the arc, the welder on the B surface immediately starts the arc, welds to a second arcing point along the anticlockwise direction, then the welder on the A surface starts welding from the first arcing point 31 along the clockwise direction, the welder on the A surface does not need to stop the arc when welding to a third arcing point 33, and the welder on the A surface immediately starts the arc and completes welding of a whole weld neck along the anticlockwise direction.
The argon arc welding cover surface can well fuse the root of the welding seam, the efficiency is 2 to 4 times that of manual arc welding, the welding seam is well formed, the repair rate is low, and the cost can be effectively reduced by 5 to 10 percent.
The installation method of the circulating fluidized bed boiler water-cooled wall in the embodiment of the invention adopts the installation from top to bottom, overcomes the difficulty that a large-scale platform cannot be built on site for assembly and integral hoisting due to narrow field, effectively saves cost, adopts argon arc welding bottoming for welding the water-cooled wall tube, adopts an argon arc cover welding method and adopts a double-sided welding technology, and solves the problem of easy deformation of the water-cooled wall tube after welding, thereby improving the welding quality and speed and reducing the welding cost.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. The method for installing the water-cooled wall of the circulating fluidized bed boiler is characterized in that the water-cooled wall comprises a pipe and fins, the pipe and the fins are fixedly connected, and the method for installing the water-cooled wall of the circulating fluidized bed boiler comprises the following steps:
step 1, setting a platform according to the size of a water-cooled wall, and manufacturing a reinforced truss;
step 2, welding pipes and fins of an upper left wall, an upper front wall, an upper right wall, an upper rear wall, a lower left wall, a lower front wall, a lower right wall and a lower rear wall of the water-cooled wall on a platform, and preparing the water-cooled wall of each section before combination;
step 3, sequentially hanging and fixing the upper left wall, the upper front wall, the upper rear wall, the upper right wall, the lower left wall, the lower front wall, the lower rear wall and the lower right wall on the reinforced truss;
and 4, butt welding the water-cooled walls of each section.
2. The method for installing the water-cooled wall of the circulating fluidized bed boiler according to claim 1, wherein the reinforcing truss of the step 1 comprises upright posts, cross beams and inclined struts, a plurality of cross beams are fixedly connected between the upright posts, the inclined struts are fixedly connected between the cross beams, and the platform of the step 1 is made of channel steel.
3. The method for installing a water wall of a circulating fluidized bed boiler according to claim 1, wherein the step 2 further comprises the steps of:
step 201, checking the width, diagonal and flatness of each section of water-cooled wall;
step 202, adjusting the part which does not meet the regulation;
and 203, performing a ball passing test by using a steel ball.
4. The method according to claim 3, wherein in the step 202, when the width is greater than or less than a fixed size, the weld between the fins is cut to properly adjust the width to a predetermined size; when the diagonal difference exceeds 10mm, cutting off partial inter-fin welding seams of the edge part with the larger size, reducing the inter-fin welding seams to the diagonal difference of less than or equal to 10mm, and welding; and when the flatness of the pipe exceeds the allowable range, correcting by adopting a portal frame by using a jack.
5. The method for installing a water wall of a circulating fluidized bed boiler according to claim 1, wherein the step 4 further comprises the steps of:
step 401, checking and correcting the pipe orifices in upper and lower groups, and comprehensively measuring the gap of the welding orifice;
step 402, fixing the nozzles of the upper and lower groups of pairs by using movable pipe clamps;
step 403, performing temporary spot welding on pipe orifices of the upper and lower groups, welding a weld junction with a moderate weld junction gap during spot welding, and properly adjusting the weld junction change which is too large or too small due to weld junction shrinkage during the spot welding when welding other weld junctions;
and 404, performing assembly welding after correction.
6. The method of installing a water wall of a circulating fluidized bed boiler of claim 4, wherein the step 404 further comprises the steps of:
step 4041, performing backing welding on the pipe orifices of each upper and lower group;
step 4042, performing face welding on the nozzles of each upper and lower group of nozzles.
7. The method for installing the water-cooled wall of the circulating fluidized bed boiler according to claim 1, wherein the backing welding in the step 4041 is performed by argon arc welding, welding from left to right, 1 blank welding and jumping.
8. The installation method of the water-cooled wall of the circulating fluidized bed boiler according to claim 1, wherein the welding method of argon arc covers is adopted in the step 4042, a double-sided welding technology is adopted, two welders are closely matched to weld for each opposite joint, firstly, the welder on the surface A starts to weld from an arc starting point I in the anticlockwise direction, when the welder on the surface B welds to an arc starting point II, the welder on the surface B does not need to stop the arc, immediately starts to weld to an arc starting point in the anticlockwise direction, then the welder on the surface A starts to weld from the arc starting point I in the clockwise direction, when the welder on the surface A welds to an arc starting point III, the welder on the surface A does not need to stop the arc, and the welder on the surface A finishes the welding of the whole weld neck in the anticlockwise direction.
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