CN100483027C - Manufacturing method of undergrate air distribution plate of circulation fluidized bed boiler - Google Patents
Manufacturing method of undergrate air distribution plate of circulation fluidized bed boiler Download PDFInfo
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- CN100483027C CN100483027C CNB2006101181457A CN200610118145A CN100483027C CN 100483027 C CN100483027 C CN 100483027C CN B2006101181457 A CNB2006101181457 A CN B2006101181457A CN 200610118145 A CN200610118145 A CN 200610118145A CN 100483027 C CN100483027 C CN 100483027C
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Abstract
The invention consists in: assembling modules by using gas-shielded welding, controlling the size of all parts of the module and then assembling the module into an integral product. Thus, in the process of making the modules, step by step controlling the welding shrinkage and the welding contraction distortion; and meanwhile, the welding contraction distortion can be reduced by using gas-shielded welding.
Description
Technical field
The present invention relates to a kind of manufacturing method of undergrate air distribution plate of circulation fluidized bed boiler, relate in particular to a kind of 300MW manufacturing method of undergrate air distribution plate of circulation fluidized bed boiler, belong to the station boiler technical field.
Background technology
300MW recirculating fluidized bed (CFB) boiler is the environment-protection boiler that the designing technique of the French ALSTOM that introduces in recent years of applicant is made, the structure of the burner hearth bottom air distribution plate of this boiler is the distinctive form of Large-scale CFB boiler, appearance and size: long 3500mm, wide 14626mm, high 809mm, form by 168 different bend pipes, in the mill, key technical problem is how to solve because welding contraction, the welding deformation that a large amount of intensive welding causes, correction, assemble method guarantee that each size of product satisfies the requirement of drawing.At present, also do not make precedent at home, the manufacturing technology of French ALSTOM is not quite clear.
In similar air distribution plate constructed products is made in the past, adopt the whole assembly fixture of product, product is carried out the overall package manufacturing, in welding, adopt a large amount of manual electric arc weldings, the product of Zhi Zaoing tends to produce appearance and size control difficulty like this, allowance for shrinkage is difficult to control, proofreaies and correct difficulty, and each size of product is difficult to reach the requirement of drawing.
Summary of the invention
The purpose of this invention is to provide a kind of can the solution because welding contraction, the welding deformation that a large amount of intensive welding causes, proofread and correct, assembling, guarantee the manufacturing method of undergrate air distribution plate of circulation fluidized bed boiler of the requirement of final each the size conforms drawing of product and dimensional tolerance.
For realizing above purpose, technical scheme of the present invention provides a kind of manufacturing method of undergrate air distribution plate of circulation fluidized bed boiler, it is characterized in that, the production sharing little module is assembled, size from little module control product, guarantee that the size of the final assembling of product satisfies the requirement of drawing, its method is:
One. the welding of little module
Step 1. is arranged at least 4 bend pipes composition pipe in place on assembly fixture, and with assembling comb plate, comb joint straight section and tube end clamping location in the middle of bend pipe, pitch is 90mm-100mm between control valve;
The pipe row that step 4. will be composed and laid out after welding carries out thermal recalibration, and the even heating-up temperature of thermal recalibration is 550 ℃-920 ℃, cooling naturally behind the thermal recalibration;
Pipe row after step 6. adopts step 4 with step 5 welding carries out thermal recalibration;
Step 7. goes up assembly fixture with the pipe of thermal recalibration row, in bend pipe end clamping location, adopts step 2,3 burn-on steel plate at the bend pipe sweep with the assembling comb plate, comb joint, forms little module, and the little module width dimensions requires than the big 3mm～5mm of figure paper size;
Step 9. repeating step 1-8 is welded into a piece little module;
Two. the module welding
Step 10. is confirmed the central datum line and the mark of product with the assembly unit on mounting plate of each little module on mounting plate during assembly unit;
From the gas shielded arc welding of center little module, adopt step 2, step 3 welding during step 11. assembly unit to the right employing trolley type of both sides the first from left piece;
Step 12. is bored the hole 0.1～0.5mm of dress blast cap sleeve pipe on the band steel of each root bend pipe, become a row, assembles the blast cap sleeve pipe then;
Step 13. is installed hanger, adopt manual electric arc welding earlier the dress welded tube arrange the hanger of module small in ends, proofreading and correct the back is that the benchmark backguy is adjusted the position of other little module hangers and welded with the hanger at two ends, is undergrate air distribution plate of circulation fluidized bed boiler.
The present invention is divided into the module manufacturing with integral product; adopt the gas shielded arc welding Knockdown block; each size of elder generation's control module; then module is combined into integral product, can progressively controls welding contracted quantity, the welding contraction distortion of each one of product by the manufacturing of module in manufacture process like this; adopt gas shielded arc welding to reduce welding deformation again simultaneously; therefore, adopt this manufacturing technology, the total quality of product, the size of each one can be guaranteed.
Advantage of the present invention is can solve because welding contraction, the welding deformation that a large amount of intensive welding causes proofreaied and correct, assembled, and guarantees final each the size conforms drawing of product and the requirement of dimensional tolerance.
Description of drawings
Fig. 1,2 is a module assembly fixture structural representation;
Fig. 3,4 is the undergrate air distribution plate of circulation fluidized bed boiler structural representation.
The specific embodiment
The invention will be further described below in conjunction with drawings and Examples.
Embodiment
Burner hearth bottom air distribution plate with 300MW recirculating fluidized bed (CFB) boiler is an example
The appearance and size of the burner hearth bottom air distribution plate of 300MW recirculating fluidized bed (CFB) boiler: long 3500mm, wide 14626mm, high 809mmmm, be made up of 168 different bend pipes.
In manufacture process, the present invention controls the size of every bend pipe, guarantee the correctness of 168 different bend pipes, the appearance and size tolerance of bend pipe is controlled at ± 1mm, in concrete operating process, the present invention adopts left and right sides bending machine to carry out bending of pipe, curved back carries out by the platform sample sample being proofreaied and correct to every pipe, proofread and correct and adopt external force correction and thermal recalibration to combine, strict control heating-up temperature during thermal recalibration, the uniformity of heating, forbid overtemperature, adopt the nature cooling behind the thermal recalibration, do not allow to adopt other media such as water to cool off fast, pipe bends the laggard ball check that works, guarantee the workmanship of every bend pipe, adopt during the former manufacturing bend pipe of these technologies, be maturation process.
As shown in Figure 1, 2, be module assembly fixture structural representation, described module assembly fixture is made up of assembly fixture 7, assembling comb plate, comb joint 8, and assembling comb plate, comb joint 8 is located at the end and the centre of assembly fixture 7.
Shown in Fig. 3,4, be the undergrate air distribution plate of circulation fluidized bed boiler structural representation, manufacturing method of undergrate air distribution plate of circulation fluidized bed boiler, its method is:
One. the welding of little module
Step 1. is with 8 bend pipes 2 composition pipe row in place on assembly fixture 7, and with assembling comb plate, comb joint 8 straight section and tube end clamping location in the middle of bend pipe 2, pitch is 90mm-100mm between control valve;
The pipe row that step 4. will be composed and laid out after welding carries out thermal recalibration, and the even heating-up temperature of thermal recalibration is 550 ℃-920 ℃, cooling naturally behind the thermal recalibration;
Pipe row after step 6. adopts step 4 with step 5 welding carries out thermal recalibration;
Step 7. goes up assembly fixture 7 with the pipe of thermal recalibration row, in clampings location, bend pipe 2 end, adopts step 2,3 burn-on steel plate 4 at bend pipe 2 sweeps with assembling comb plate, comb joint 8, forms little module, and the little module width dimensions requires than the big 3mm～5mm of figure paper size;
Step 9. repeating step 1-8 is welded into 21 little modules;
Two. the module welding
Step 10. is confirmed the central datum line and the mark of product with the assembly unit on mounting plate of each little module on mounting plate during assembly unit;
From the gas shielded arc welding of center little module, adopt step 2, step 3 welding during step 11. assembly unit to the right employing trolley type of both sides the first from left piece;
Step 12. is bored the hole 0.1～0.5mm of dress blast cap sleeve pipe 5 on the band steel 3 of bend pipe 2, become a row, assembles blast cap sleeve pipe 5 then;
Step 13. is installed hanger 1, adopt manual electric arc welding earlier the dress welded tube arrange the hanger 1 of module small in ends, proofreading and correct the back is that the benchmark backguy is adjusted the position of other little module hangers and welded with the hanger at two ends, is undergrate air distribution plate of circulation fluidized bed boiler.
Check after step 14. overall package; The welded seam that visual examination is all, weld seam to hanger carries out magnetic (MT) inspection, check with the mounting plate datum line pipe end of air distribution plate size, pipe pitch size, Diagonal Dimension and perform record, all pipes lead to the ball check, the affirmation product meets every specification requirement;
Step 15. is for eliminating welding stress assembling POST WELD HEAT TREATMENT OF ENTIRE;
Product size inspection after step 16. heat treatment, inspection flatness, cornerwise size also adjusted, revised;
Step 18. pair bend pipe 2 pursues in the logical ball purge tube of root;
The water pressure test of step 19. product is carried out to pursue the root pipe, and hydraulic pressure pressure is 1.5 times of product operating pressure;
Must remove ponding by logical sponge block after step 20. water pressure test, put pipe cap after drying up in the pipe.
Step 21. paint: for transportation and storage on-site need, product carries out antifouling paint, and the paint front surface should deoil, scrubbing.Pipe end service weldability coating paints.Paint is installed the pipe end end cap after handling immediately.
Step 22. packing: packing should take effective measures, and makes product maintain a good state 2 for guaranteeing product quality when handling and transportation, when product lands, should use wooden bedding and padding.
Aspect welding procedure: all welding require the file of establishment welding procedure specification (WPS) and qualification of welding procedure (PQR) to conform to the standard that requires fully according to " steam boiler safety and technical supervision rules ", and the welding requirements of band steel and pipe is by the manufacturer's standard examination.
All welding pre-heating temperatures in the assembling welding are 〉=10 ℃.Postwelding carries out visual examination.Welding band steel, sealing steel plate are provided with welding contracted quantity 0.3mm, adopt the gas shielded arc welding welding, these methods employings can be controlled welding and shrink, and reduce welding deformation.The gas shielded arc welding of trolley type or manual welding welding machine are outsourcing.
In the design of the assembling frame that assembles, we design by the module of minimum, and the assembly fixture of each little module structurally can satisfy the manufacture process requirement of product according to the product structure independent assortment.The project organization of assembly fixture is very important, determines three datum lines on assembly fixture: the datum line at the two ends of the central datum line of furnace bottom air distribution plate, bend pipe pipe.Should guarantee cornerwise size simultaneously.The design of assembly fixture also must be considered the welding allowance for shrinkage 1～2mm/m of tube length, welding contracted quantity 0.1～0.3mm/ pitch of pipe row width, satisfies the needs of product size control.
Claims (1)
1. a manufacturing method of undergrate air distribution plate of circulation fluidized bed boiler is characterized in that, the production sharing little module is assembled, and from the size of little module control product, guarantees that the size of the final assembling of product satisfies the requirement of drawing, and its method is:
One. the welding of little module
Step 1. goes up composition pipe row in place with at least 4 bend pipes (2) at assembly fixture (7), and with assembling comb plate, comb joint (8) straight section and tube end clamping location in the middle of bend pipe (2), pitch is 90mm-100mm between control valve;
Step 2. is center assembly band steel (3) between per two bend pipes (2), carries out the spot welding of bend pipe (2) and band steel (3) then with the gas shielded arc welding of trolley type, and the distance of spot welding is 250mm-300mm;
Step 3. is removed assembly fixture (7) and assembling comb plate, comb joint (8), adopts the gas shielded arc welding of trolley type that per two bend pipes (2) are carried out the welding of positive and negative intersection, is welded into pipe row;
The pipe row that step 4. will be composed and laid out after welding carries out thermal recalibration, and the even heating-up temperature of thermal recalibration is 550 ℃-920 ℃, cooling naturally behind the thermal recalibration;
Step 5. goes up assembly fixture (7) with the row of pipe, in bend pipe (2) end clamping location, adopts step 2, the 3 support member pipe (6) of burn-oning with assembling comb plate, comb joint (8) in bend pipe (2) lower end;
Pipe row after step 6. adopts step 4 with step 5 welding carries out thermal recalibration;
Step 7. goes up assembly fixture (7) with the pipe row of thermal recalibration, locate in the clamping of bend pipe (2) end with assembling comb plate, comb joint (8), adopt step 2,3 steel plate (4) of burn-oning at bend pipe (2) sweep, form little module, the little module width dimensions requires than the big 3mm～5mm of figure paper size;
Step 8. adopts step 4 to carry out thermal recalibration welding steel (4) back little module;
Step 9. repeating step 1-8 is welded into-piece piece little module;
Two. the module welding
Step 10. is confirmed the central datum line and the mark of product with the assembly unit on mounting plate of each little module on mounting plate during assembly unit;
From the gas shielded arc welding of center little module, adopt step 2, step 3 welding during step 11. assembly unit to the right employing trolley type of both sides the first from left piece;
Step 12. goes up the hole 0.1～0.5mm that bores dress blast cap sleeve pipe (5) at the band steel (3) of bend pipe (2), becomes a row, assembles blast cap sleeve pipe (5) then;
Step 13. is installed hanger (1), adopt manual electric arc welding earlier the dress welded tube arrange the hanger (1) of module small in ends, proofreading and correct the back is that the benchmark backguy is adjusted the position of other little module hangers and welded with the hanger at two ends, is undergrate air distribution plate of circulation fluidized bed boiler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101181457A CN100483027C (en) | 2006-11-09 | 2006-11-09 | Manufacturing method of undergrate air distribution plate of circulation fluidized bed boiler |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2006101181457A CN100483027C (en) | 2006-11-09 | 2006-11-09 | Manufacturing method of undergrate air distribution plate of circulation fluidized bed boiler |
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| Publication Number | Publication Date |
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| CN1948830A CN1948830A (en) | 2007-04-18 |
| CN100483027C true CN100483027C (en) | 2009-04-29 |
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| CNB2006101181457A Active CN100483027C (en) | 2006-11-09 | 2006-11-09 | Manufacturing method of undergrate air distribution plate of circulation fluidized bed boiler |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113242950B (en) * | 2018-11-07 | 2024-05-24 | 住友重机械福惠能源有限公司 | Burner air bar for use in a fluidized bed reactor and fluidized bed reactor |
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- 2006-11-09 CN CNB2006101181457A patent/CN100483027C/en active Active
Non-Patent Citations (4)
| Title |
|---|
| 循环流化床布风板的工艺措施. 曲广义，周克宇，夏建宏.锅炉制造，第184期. 2002 |
| 循环流化床布风板的工艺措施. 曲广义，周克宇，夏建宏.锅炉制造，第184期. 2002 * |
| 循环流化床锅炉布风板的焊接. 李世魁，刘鲁江，林海燕.焊接. 2003 |
| 循环流化床锅炉布风板的焊接. 李世魁，刘鲁江，林海燕.焊接. 2003 * |
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