CN104162760A - CFB boiler water cooling wall abraded area repairing method - Google Patents
CFB boiler water cooling wall abraded area repairing method Download PDFInfo
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- CN104162760A CN104162760A CN201410378322.XA CN201410378322A CN104162760A CN 104162760 A CN104162760 A CN 104162760A CN 201410378322 A CN201410378322 A CN 201410378322A CN 104162760 A CN104162760 A CN 104162760A
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- area
- cooling wall
- water
- water cooling
- cored wires
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P6/00—Restoring or reconditioning objects
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- Coating By Spraying Or Casting (AREA)
Abstract
The invention relates to a CFB boiler water cooling wall abraded area repairing method. The CFB boiler water cooling wall abraded area repairing method includes the following steps that 1, components needed by cored wires for bead welding are selected, processed and produced, wherein the components include boron, chromium carbide, carbon, iron, rare earth, nickel and molybdenum; 2, the cored wires are fused in the abraded area of the water cooling wall through a laser welding process; 3, the repairing condition of the abraded area is observed; 4, sand is sprayed to the periphery of the repaired area; 5, sealing reagents are painted to the repaired area and the periphery of the repaired area. Compared with the prior art, the cored wires with the components of a new proportion are adopted, the Fe, the B, the Cr and the C in the hard-phase of the cored wires have excellent abrasion resistance and high temperature resistance, the cored wires are high in density of the hard phase, the cored wires are in complete alloy combination with the water cooling wall, the purpose that the hard phase and a base material are inlaid firmly is achieved, the abrasion resistance of the repaired area is improved greatly, and by the adoption of the cored wires and the method, the water cooling water can be prevented from being replaced.
Description
Technical field
The present invention relates to CFBB, particularly a kind of restorative procedure of CFB boiler water wall eroded area.
Background technology
CFBB, referred to as CFB boiler, is a kind of environment-friendly boiler that adopts advanced combustion technology, is also to apply in recent years more boiler type.Compare with traditional boiler, CFB boiler can be realized low-temperature burning and can realize desulfuration in furnace, very environmental protection; It also can be using gangue as fuel, and it is very wide to the scope of application of fuel as seen, and the efficiency of combustion of this boiler type is also very high, can reach more than 98%; But due to the flow feature of the structure of CFB boiler self, bed material and material, material is strong back-mixing in stove, and these materials are washed away repeatedly to the water-cooling wall of boiler, causes the very fast attenuate of water-cooling wall, cause the heavy wear of water-cooling wall part, the operation stable to CFB boiler safety brings hidden danger.
In the face of the phenomenon of CFB boiler cold-water wall concentrated wear, conventional processing method is at present
1, be direct replacing for the water-cooling wall of serious wear;
2, manual welding is mended water-cooling wall, spraying abrasion-proof layer again after polishing;
3, spraying abrasion-proof layer on former cated basis.
Wherein using maximum methods is spraying abrasion-proof layer again on former cated basis, the method that specifically adopts manual electric arc welding to fill, first manual electric arc welding fills method is built-up welding abrading section, then be that abrasive machine polishes the welding bead of built-up welding by hand, until polishing is level and smooth, finally implement Ultrasonic Arc Sprayed coated with wear-resisting alloy at repair welding position, specifically, Supersonic Arc Spraying Technique evenly sprays one deck alloy and increases the service life in abrading section, although this technology speed of application is fast and it is more wear-resisting than water-cooling wall originally to adopt spraying abrasion-proof alloy-layer to make, but abrasion-proof particle is inlayed firm not, visible this technology has just extended the wear-resisting time, so under long-term ruuning situation, coating still has concentrated wear phenomenon.
For the solve above-mentioned raising problem in water-cooling wall service life of concentrated wear, the present invention proposes and a kind ofly avoid changing water-cooling wall and can improve the restorative procedure of the CFB boiler water wall eroded area in water-cooling wall service life.
Summary of the invention
The present invention has overcome above-mentioned the deficiencies in the prior art, has proposed a kind ofly to avoid changing water-cooling wall and can improve the restorative procedure of the CFB boiler water wall eroded area in water-cooling wall service life.
Technical scheme of the present invention is achieved in that
A restorative procedure for CFB boiler water wall eroded area, it comprises the following steps:
The first step, chooses the required composition of built-up welding powder cored filament material and carries out processing and fabricating
Described powder cored filament material is resurfacing welding material, this powder cored filament material composition comprises: boron (5-11%wt), chromium carbide (2-20%wt), carbon (0.2-1.2%wt), rare earth (0.1-1%wt), nickel (0.2-3%wt), molybdenum (0.03-0.2%wt), and surplus is iron;
Hard phase composition Fe-B-Cr-C in this powder cored filament material material has excellent Wear-resistant, high-temperature resistant performance, and the hard phase density of this powder cored filament material is high, make the wearability of this powder cored filament material material good, use this powder cored filament material material can avoid changing water-cooling wall as overlay cladding, also greatly increase the service life of the water-cooling wall after reparation.
Second step, adopts class Laser Welding technique
Adopt class Laser Welding technique that powder cored filament material made in the first step is fused to the eroded area on water-cooling wall, on eroded area, realize built-up welding, on eroded area, be just coated with overlay cladding;
Adopting this powder cored filament material material and class Laser Welding technique to fill eroded area is directly repair welding on former eroded area in fact, this powder cored filament material material and water-cooling wall are realized complete metallurgical binding, seamlessly transit to realize, solve hard phase and base material and inlayed firm problem, having improved the wearability of water-cooling wall, is script cold-water wall or common repair welding material lifetime 5-10 times.Here adopting class Laser Welding technique, is mainly because this technique is carried little energy, can not make water-cooling wall produce high temperature and metallographic change.
The 3rd step, observes
The reparation situation of observing eroded area, if restoring area has reached smooth requirement, can adopt next step;
If out-of-flatness has the words at concavo-convex position will cause water-cooling wall wearing and tearing to accelerate, thus reparation situation need to be observed, if restoring area when reaching required smooth requirement, can adopt next step step; The position of restoring area described here is the position of eroded area.
The 4th step, sandblast
By sand-blasting machine, the periphery of restoring area is carried out to sandblast, realize the texturing of restoring area periphery, hole sealing agent can be combined with the water-cooling wall part of restoring area periphery;
The 5th step, brush hole sealing agent
Brush hole sealing agent is the hole sealing on restoring area, restoring area and water-cooling wall part is realized and seamlessly transit.
Adopt the invention has the beneficial effects as follows of technique scheme:
The present invention a kind ofly avoids changing water-cooling wall and can improve the restorative procedure of the CFB boiler water wall eroded area in water-cooling wall service life, specifically, the present invention adopts a kind of powder cored filament material resurfacing welding material of new component ratio, hard phase composition Fe-B-Cr-C in this powder cored filament material material has excellent Wear-resistant, high-temperature resistant performance, and the hard phase density of this powder cored filament material is high, make the wearability of this powder cored filament material material good, use this powder cored filament material material can avoid changing water-cooling wall as overlay cladding, also greatly increase the service life of the water-cooling wall after reparation; Concrete repair process is first to adopt the built-up welding of powder cored filament material material at eroded area, then be that overlay cladding periphery carries out sandblast at eroded area periphery, then at overlay cladding and overlay cladding periphery brush hole sealing agent.
Detailed description of the invention
The specific embodiment of the present invention is as follows:
Embodiment 1: a kind of restorative procedure of CFB boiler water wall eroded area, it comprises the following steps:
The first step, chooses the required composition of built-up welding powder cored filament material and carries out processing and fabricating
This powder cored filament material composition comprises: boron (6%wt), chromium carbide (18%wt), carbon (1%wt), iron (74.1%wt), rare earth (0.6%wt), nickel (0.2%wt) and molybdenum (0.1%wt);
Second step, adopts class Laser Welding technique
Adopt class Laser Welding technique that powder cored filament material made in the first step is fused to the eroded area on water-cooling wall, on eroded area, realize built-up welding, on eroded area, be just coated with overlay cladding;
The 3rd step, observes
The reparation situation of observing eroded area, if restoring area has reached smooth requirement, can adopt next step;
The 4th step, sandblast
By sand-blasting machine, the periphery of restoring area is carried out to sandblast, realize the texturing of restoring area periphery, hole sealing agent can be combined with the water-cooling wall part of restoring area periphery;
The 5th step, brush hole sealing agent
Brush hole sealing agent is the hole sealing on restoring area, restoring area and water-cooling wall part is realized and seamlessly transit.
The present embodiment abrasion resistance that data adopt the powder cored filament material that this component ratio makes in order to explanation is by experiment higher than high-abrasive material of the prior art:
Specific as follows:
Experiment title: electric arc spraying carbon steel, LX-88A and build-up wear-resistant layer wear test
Experiment material: 20 order quartz sands
Experimental facilities: rush-harvesting and rush-planting sand-blasting machine, 8mm sand-blasting gun, 8 kilograms of compressed air (wherein the angle of shock is 45 degree)
| High-abrasive material: | The loss in weight (gram) |
| Carbon steel | 110 |
| LX-88A coating | 21 |
| Build-up wear-resistant layer (adopting the material in the application) | 1.8 |
Visible rub proofness and bodies lost weight are inversely proportional to, and the bodies lost weight of build-up wear-resistant layer is minimum.
(note: carbon steel, LX-88A and build-up wear-resistant layer three's density are set to identical, because weight is directly proportional to volume, measure respectively the weight of three kinds of high-abrasive materials by metering outfit, calculate three's volume, and described volume is actual wear extent.)
Embodiment 2: a kind of restorative procedure of CFB boiler water wall eroded area, it comprises the following steps:
The first step, chooses the required composition of built-up welding powder cored filament material and carries out processing and fabricating
This powder cored filament material composition comprises: boron (6.2%wt), chromium carbide (18.5%wt), carbon (0.7%wt), iron (74.2%wt), rare earth (0.15%wt), nickel (0.2%wt) and molybdenum (0.05%wt);
Second step, adopts class Laser Welding technique
Adopt class Laser Welding technique that powder cored filament material made in the first step is fused to the eroded area on water-cooling wall, on eroded area, realize built-up welding, on eroded area, be just coated with overlay cladding;
The 3rd step, observes
The reparation situation of observing eroded area, if restoring area has reached smooth requirement, can adopt next step;
The 4th step, sandblast
By sand-blasting machine, the periphery of restoring area is carried out to sandblast, realize the texturing of restoring area periphery, hole sealing agent can be combined with the water-cooling wall part of restoring area periphery;
The 5th step, brush hole sealing agent
Brush hole sealing agent is the hole sealing on restoring area, restoring area and water-cooling wall part is realized and seamlessly transit.
The present embodiment abrasion resistance that data adopt the powder cored filament material that this component ratio makes in order to explanation is by experiment higher than high-abrasive material of the prior art:
Specific as follows:
Experiment title: electric arc spraying carbon steel, LX-88A and build-up wear-resistant layer wear test
Experiment material: 20 order quartz sands
Experimental facilities: rush-harvesting and rush-planting sand-blasting machine, 8mm sand-blasting gun, 8 kilograms of compressed air (wherein the angle of shock is 45 degree)
| High-abrasive material: | The loss in weight (gram) |
| Carbon steel | 110 |
| LX-88A coating | 21 |
| Build-up wear-resistant layer (adopting the material in the application) | 1.5 |
Visible rub proofness and bodies lost weight are inversely proportional to, and the bodies lost weight of build-up wear-resistant layer is minimum.
(note: carbon steel, LX-88A and build-up wear-resistant layer three's density are set to identical, because weight is directly proportional to volume, measure respectively the weight of three kinds of high-abrasive materials by metering outfit, calculate three's volume, and described volume is actual wear extent.)
Claims (1)
1. a restorative procedure for CFB boiler water wall eroded area, is characterized in that: it comprises the following steps:
The first step, chooses the required composition of built-up welding powder cored filament material and carries out processing and fabricating
Described powder cored filament material is resurfacing welding material, this powder cored filament material composition comprises: boron (5-11%wt), chromium carbide (2-20%wt), carbon (0.2-1.2%wt), rare earth (0.1-1%wt), nickel (0.2-3%wt), molybdenum (0.03-0.2%wt), and surplus is iron;
Second step, adopts class Laser Welding technique
Adopt class Laser Welding technique that powder cored filament material made in the first step is fused to the eroded area on water-cooling wall, on eroded area, realize built-up welding, on eroded area, be just coated with overlay cladding;
The 3rd step, observes
The reparation situation of observing eroded area, if restoring area has reached smooth requirement, can adopt next step;
The 4th step, sandblast
By sand-blasting machine, the periphery of restoring area is carried out to sandblast, realize the texturing of restoring area periphery, hole sealing agent can be combined with the water-cooling wall part of restoring area periphery;
The 5th step, brush hole sealing agent
Brush hole sealing agent is the hole sealing on restoring area, restoring area and water-cooling wall part is realized and seamlessly transit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410378322.XA CN104162760B (en) | 2014-08-01 | 2014-08-01 | A kind of restorative procedure in CFB boiler waterwall tube cracking region |
Applications Claiming Priority (1)
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|---|---|---|---|
| CN201410378322.XA CN104162760B (en) | 2014-08-01 | 2014-08-01 | A kind of restorative procedure in CFB boiler waterwall tube cracking region |
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| CN104162760A true CN104162760A (en) | 2014-11-26 |
| CN104162760B CN104162760B (en) | 2017-06-13 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107538150A (en) * | 2017-08-26 | 2018-01-05 | 芜湖鼎瀚再制造技术有限公司 | Mine engineering mechanical implement reparation fe-based self-fluxing alloy powder and its welding procedure |
| CN108286030A (en) * | 2018-01-29 | 2018-07-17 | 北京工业大学 | A kind of powder cored filament material containing rare earth and coating production preparing iron-based wear-resistant coating for electric arc spraying |
| CN111155088A (en) * | 2020-01-15 | 2020-05-15 | 江苏科环新材料有限公司 | Method for remanufacturing water-cooled wall of waste incineration power generation boiler |
| CN112475537A (en) * | 2020-11-11 | 2021-03-12 | 国家能源集团谏壁发电厂 | On-site repair method for T23 water wall based on surfacing technology |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107538150A (en) * | 2017-08-26 | 2018-01-05 | 芜湖鼎瀚再制造技术有限公司 | Mine engineering mechanical implement reparation fe-based self-fluxing alloy powder and its welding procedure |
| CN108286030A (en) * | 2018-01-29 | 2018-07-17 | 北京工业大学 | A kind of powder cored filament material containing rare earth and coating production preparing iron-based wear-resistant coating for electric arc spraying |
| CN111155088A (en) * | 2020-01-15 | 2020-05-15 | 江苏科环新材料有限公司 | Method for remanufacturing water-cooled wall of waste incineration power generation boiler |
| CN111155088B (en) * | 2020-01-15 | 2022-05-27 | 江苏科环新材料有限公司 | Method for remanufacturing water-cooled wall of waste incineration power generation boiler |
| CN112475537A (en) * | 2020-11-11 | 2021-03-12 | 国家能源集团谏壁发电厂 | On-site repair method for T23 water wall based on surfacing technology |
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| CN104162760B (en) | 2017-06-13 |
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