CN102021560B - Method for repairing water-cooled wall of circulating fluidized bed by adopting laser cladding - Google Patents
Method for repairing water-cooled wall of circulating fluidized bed by adopting laser cladding Download PDFInfo
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- CN102021560B CN102021560B CN200910187398A CN200910187398A CN102021560B CN 102021560 B CN102021560 B CN 102021560B CN 200910187398 A CN200910187398 A CN 200910187398A CN 200910187398 A CN200910187398 A CN 200910187398A CN 102021560 B CN102021560 B CN 102021560B
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Abstract
A method for repairing a water-cooled wall of a circulating fluidized bed by adopting laser cladding is characterized in that during laser cladding, firstly using a frock to clamp a pipe where an circular arc shaped surface of the water-cooled wall is located to ensure the flatness of the pipe, rotating the frock to clad the next piece of circular arc shaped surface after cladding one piece of circular arc shaped surface, completing cladding the whole circular arc shaped surface through reciprocating motion of a bare head and continuous rotation of the pipe and then using the same method to clad the next circular arc shaped surface of the water-cooled wall; during cladding, the laser beams moving back and forth at the top of the circular arc shaped surface along the longitudinal direction of the water-cooled wall to carry out scanning radiation of the spots with diameter of 4mm, wherein the power of the laser beams is 6000-10000W and the thickness of the laser cladding layer is 0.5-0.7mm; pumping high pressure air to the interior of the water-cooled water pipe where the cladding region is located; and directly feeding the powder to the molten pool by virtue of the kinetic energy of the powder by way of feeding powder under gravity. The method has the characteristics of strong adaptability, simple and convenient operation, low thermal deformation and metallurgical bonding between the coating and the base material.
Description
Technical field
The present invention relates to a kind of inoperative component restorative procedure of boiler plant, particularly relate to a kind of method that adopts laser melting coating to repair the circulating fluid-bed water wall, belong to C23C24/10 (2006.01) the I technical field in the IPC International Patent Classification (IPC).
Background technology
Petrochemical complex is with the water wall of circulating fluid-bed, and the present position is around the bottom, combustion chamber; Owing at high temperature work for a long time and fuel and flying dust one, under the secondary wind action to the wearing and tearing of pipeline outer wall, and the corrosion of sulphur; Usually causing water wall to cause in the course of the work leaks; Force boiler to stop production, user's economy is caused damage, the production program is impacted.
In order to prolong the work-ing life of water wall, the spraying of on the water wall tube wall, adopting that present stage usually adopts prevents wearing and tearing and corrosion.Dominant mechanism is that coating at high temperature can generate densification, hard, zone of oxidation that chemicalstability is higher, and combining of this zone of oxidation and matrix is very firm; The hardness of the hardness ratio matrix of coating is bigger, but shortcoming is that sprayed coating can come off and protection was lost efficacy in the course of the work.Also having a kind of method is at water wall surface overlaying high-rigidity resurfacing welding layer, and advantage is can not come off and lose efficacy because of local layer, and shortcoming is that large-area built-up welding is because heat affecting tends to cause the water wall deformation effect to install very greatly.
Therefore, select the water wall restorative procedure of suitable petrochemical complex, guarantee to repair that back water wall thermal distortion is little, coating and base material metallurgical junction get togather is the current problem that needs to be resolved hurrily with circulating fluid-bed.
The laser melting coating recovery technique has obtained rapid popularization and widespread use in recent years as a kind of advanced person's re-manufacturing technology.
Laser fusing-covering forming technique utilizes the high characteristics of high energy laser beam focused energy; Moment will be preset or send the powdered alloy of putting, have specific physical, chemistry or mechanical property to melt fully synchronously automatically with laser at substrate surface; Base material part fusing simultaneously forms a kind of new composite shape matl, rapid solidification after the laser beam flying; The fine and close coating of acquisition and matrix metallurgical binding is to reach the purpose of recovering geometrical dimension and surface strengthening.
At present, about utilizing laser melting and coating process to carry out the patent of equipment unit reparation and reporting a lot: for example,
Publication number is " laser cladding repair technique for engine crankshaft " that the Chinese invention patent application of CN101109083 provides, and is to carry out according to the following steps: A. carries out degreasing and rust removal in room temperature to the bent axle surface to be handled; B. select DL-HL-T10000 type CO for use
2Laser apparatus, worktable is a numerically-controlled machine, utilizes laser apparatus automatic powder feeding device to send into the molten bath to iron-based or self-fusible alloy powder of nickel-base, carries out laser melting coating reparation and reinforcement on the bent axle surface; Processing parameter is: cladding power P=1000W～10000W; Spot diameter D=2mm～20mm; Scan velocity V=200～2000mm/min; Overlapping rate 20～40%.
Publication number is " a kind of laser melting and coating process of thin-walled cylindrical workpiece " that the Chinese invention patent application of CN101204757 provides, and its processing parameter is: the pool size diameter is that 2～5mm, sweep velocity are 15～40mm/s, power: 2000～5000W; Carry out cladding by spiral-line; It is characterized in that: the initial point of every spiral-line hockets by the circumference subregion, and zone sequence keeps trying one's best big angle.
Publication number is " carburization-like overloading tooth component tooth surface laser cladding powdered material and the restorative procedure " that the Chinese invention patent application of CN101100746 provides, and this powdered material comprises the material of following mass percent: 0.80-1.10%C, 7.50-9.00%Mn; 0.90-1.30%Cr, 0.20-0.35%Mo, 2.00-3.50%B; 2.50-3.50%Si; Impurity P≤0.06%, impurity S≤0.04%, all the other are Fe not; Powder size is-140 orders～+ 260 orders.Laser melting coating unit time interaction energy metric density is 1.0 * 10
8W/m
2～10
9W/m
2
Though the technique scheme that prior art provides can utilize laser melting and coating process that the equipment component parts are repaired; And, obtain certain technique effect through preparing the problem that suitable cladding material has overcome crackle, pore and the microtexture ununiformity of the existence of laser crucible zone.But to other specific equipment unit; Especially (be exactly at the special construction of picture water wall many extended surface tubes welding successively longitudinally; The water wall surface area of forming a monoblock is about 10m * 2m; Whole the wavy surface of forming for semi arch, must guarantee during cladding the hot spot vertical irradiation on cladding face the cladding WS always at the water wall tube top), existing laser melting and coating process can not adapt to the application of this project.
Retrieve verification through the applicant: domestic beyond example still; Do not see relevant report abroad yet; Seek out the mode of suitable employing laser melting coating and repair the water wall of petrochemical complex, still need the those skilled in the art further to make creationary research work with circulating fluid-bed.
Summary of the invention
The objective of the invention is to the water wall Damage and Failure repaired difficult problem to prior art; Through research improvement repeatedly; Provided the method that a kind of mode that adopts laser melting coating is repaired the circulating fluid-bed water wall; This restorative procedure adopts laser melting and coating process at water wall surface cladding one deck abrasion-proof corrosion-proof erosion resisting coating; Because laser melting coating is to adopt high energy laser beam moment irradiation substrate surface to make little the melting of cladding material and substrate surface and metallurgical binding, very little and laser cladding layer of heat affecting and base material are metallurgical binding, the situation that can not occur coming off.
The technical scheme that the present invention provides is: this employing laser melting coating is repaired the method for circulating fluid-bed water wall, includes surface finish, laser melting coating, and mill is repaiied, and detects step, is characterized in:
1. in laser cladding process; An arc surface with circulating fluid-bed water wall to be repaired is that a cladding area carries out the cladding operation; Be that first recruitment is installed the pipe at arc surface place of this circulating fluid-bed water wall to be repaired to guarantee the planeness of this pipe; Rotary tooling carries out next bar cladding again after one of the cladding; To-and-fro movement through shaven head and continuous swivel pipe are accomplished the cladding of whole arc surface, and then carry out the cladding of the next arc surface of circulating fluid-bed water wall to be repaired with same procedure; Wherein said frock is: change the hollow cylinder that diameter is slightly less than the water wall tube internal diameter into the both sides of former digital control processing machine are top; The both sides cylinder heads in the water wall tube that needs cladding when being installed; So just guaranteed the planeness of this pipe; The adjustable jig all is equipped with in cylinder both sides, both sides, in order to block water wall it can be rotated with processing machine, and the hollow of cylinder is that the inner cooling gas of connection water wall tube is used;
2. in laser cladding process, laser beam vertically moves back and forth at the arc surface top along water wall, is the hot spot scanning radiation of 4mm with the spot diameter, and laser beam power is 6000-10000W, and the laser melting coating layer thickness is 0.5-0.7mm;
3. in laser cladding process, water wall tube inner logical high-pressure air in cladding area place cools off, and in time takes away amount of residual heat will, effectively reduces heat affecting more;
4. laser coating and powder feeding: the laser melting coating water wall tube is with the chemical ingredients (weight meter) of Co-based alloy powder: C:1.0～1.6%, Cr:28～34%, Ni:2～5%; W:3～8%, Mn:0.2～0.5%, Si:1.0～1.4%; B:0.02～0.06%; Zr:0.05～0.10%, Ce:0.02～0.06%, Co: surplus; Mode with the gravity powder feeding relies on the powder self kinetic energy directly to send into the molten bath; So not only can simplify technology but also can improve powder using efficiency; And contrast powder feeder synchronous powder feeding system powder using efficiency improves greatly, does not have the gas that directly blows the molten bath again and forms power loss and reduce cladding efficient.
Compared with prior art, the invention has the beneficial effects as follows: flexibility is strong, easy and simple to handle, thermal distortion is little, coating and base material metallurgical binding.
Embodiment
The renovation technique of embodiment 1 certain sulfuration bed water wall
Process step is following:
1, detects and record before the cladding
2, will need the top blast sand polishing of cladding before the cladding, zone of oxidation removed clean
3, laser melting coating:
With frock water wall is compressed before A, the cladding; Prevent in cladding process, to occur moving; Wherein said frock is: change the hollow cylinder that diameter is slightly less than the water wall tube internal diameter into the both sides of former digital control processing machine are top, the both sides cylinder heads into the planeness that guarantees this pipe in the water wall tube that needs cladding when being installed, and the adjustable jig all is equipped with in cylinder both sides, both sides; In order to block water wall it can be rotated with processing machine, the hollow of cylinder is that the inner cooling gas of connection water wall tube is used;
Processing parameter is when B, cladding: the about 4mm of pool size diameter, and the about 0.07mm of the degree of depth, be 0.02s heat-up time, and laser power is about 8500W, and laser scanning speed is that 30mm/s plays the preceding elder generation of light to treating the inner logical high pressure dry air of cladding pipe;
C, laser melting coating water wall tube are used Co-based alloy powder, chemical ingredients (weight meter): C:1.0～1.6%; Cr:28～34%; Ni:2～5%; W:3～8%; Mn:0.2～0.5%; Si:1.0～1.4%; B:0.02～0.06%; Zr:0.05～0.10%; Ce:0.02～0.06%; Co: surplus.
4, after the cladding cladding face is carried out the blast polishing, the high point in surface is tied with the angle mill
5, detect and record defective such as do not allow crackle, pore, be mingled with after the cladding
Claims (1)
1. a method that adopts laser melting coating to repair the circulating fluid-bed water wall includes surface finish, laser melting coating, and mill is repaiied, and detects step, it is characterized in that:
(1) in laser cladding process; An arc surface with circulating fluid-bed water wall to be repaired is that a cladding area carries out the cladding operation; Be that first recruitment is installed the pipe at arc surface place of this circulating fluid-bed water wall to be repaired to guarantee the planeness of this pipe; Rotary tooling carries out next bar cladding again after one of the cladding; To-and-fro movement through shaven head and continuous swivel pipe are accomplished the cladding of whole arc surface, and then carry out the cladding of the next arc surface of circulating fluid-bed water wall to be repaired with same procedure;
(2) in laser cladding process, laser beam vertically moves back and forth at the arc surface top along water wall, is the hot spot scanning radiation of 4mm with the spot diameter, and laser beam power is 6000-10000W, and the laser melting coating layer thickness is 0.5-0.7mm;
(3) in laser cladding process, water wall tube inner logical high-pressure air in cladding area place cools off, and in time takes away amount of residual heat will, effectively reduces heat affecting more;
(4) laser coating and powder feeding: the chemical ingredients of the Co-based alloy powder that the laser melting coating water wall uses is by weight: C:1.0～1.6%, Cr:28～34%, Ni:2～5%; W:3～8%, Mn:0.2～0.5%, Si:1.0～1.4%; B:0.02～0.06%; Zr:0.05～0.10%, Ce:0.02～0.06%, Co: surplus; Mode with the gravity powder feeding relies on the powdered alloy self kinetic energy directly to send into the molten bath.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910187398A CN102021560B (en) | 2009-09-17 | 2009-09-17 | Method for repairing water-cooled wall of circulating fluidized bed by adopting laser cladding |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910187398A CN102021560B (en) | 2009-09-17 | 2009-09-17 | Method for repairing water-cooled wall of circulating fluidized bed by adopting laser cladding |
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| Publication Number | Publication Date |
|---|---|
| CN102021560A CN102021560A (en) | 2011-04-20 |
| CN102021560B true CN102021560B (en) | 2012-09-19 |
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| CN200910187398A Active CN102021560B (en) | 2009-09-17 | 2009-09-17 | Method for repairing water-cooled wall of circulating fluidized bed by adopting laser cladding |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104878383A (en) * | 2015-06-17 | 2015-09-02 | 北京瑞观光电科技有限公司 | Mandril manufacturing method using semiconductor laser prepared alloy layer to replace electroplating layer |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1215131A (en) * | 1997-10-20 | 1999-04-28 | 株式会社日立制作所 | Gas turbine nozzle, Gas turbine for electricity generation, cobalrt base alloy and material for welding |
| CN1405355A (en) * | 2001-08-04 | 2003-03-26 | 山东科技大学机械电子工程学院 | Method for depositing paint-coat of metal surface, especially for gradient paint-coat |
-
2009
- 2009-09-17 CN CN200910187398A patent/CN102021560B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1215131A (en) * | 1997-10-20 | 1999-04-28 | 株式会社日立制作所 | Gas turbine nozzle, Gas turbine for electricity generation, cobalrt base alloy and material for welding |
| CN1405355A (en) * | 2001-08-04 | 2003-03-26 | 山东科技大学机械电子工程学院 | Method for depositing paint-coat of metal surface, especially for gradient paint-coat |
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| CN102021560A (en) | 2011-04-20 |
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Effective date of registration: 20170407 Address after: 200120 Shanghai, Nanhui, new town, Hong Kong Road, No. 1758, room, building 1, room A-171 Patentee after: Shanghai continental Laser Surface Engineering Co., Ltd. Address before: 110136 Shenyang, Shenbei New Area Province Economic Development Zone, justice, Shen North Road, No. 29, No. Patentee before: Dalu Laser Technology Co., Ltd., Shenyang |