CN106400008A - Preparing method for high-temperature-resisting and abrasion-resisting coating of circulating fluidized bed boiler - Google Patents
Preparing method for high-temperature-resisting and abrasion-resisting coating of circulating fluidized bed boiler Download PDFInfo
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- CN106400008A CN106400008A CN201611027968.9A CN201611027968A CN106400008A CN 106400008 A CN106400008 A CN 106400008A CN 201611027968 A CN201611027968 A CN 201611027968A CN 106400008 A CN106400008 A CN 106400008A
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- China
- Prior art keywords
- laser
- coating
- fluidized bed
- resisting
- circulating fluidized
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Classifications
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C24/00—Coating starting from inorganic powder
- C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
- C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
- C23C24/103—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
- C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention discloses a laser phase change preparing method for a high-temperature-resisting and abrasion-resisting coating of a circulating fluidized bed. The laser phase change preparing method includes the steps that firstly, the surface of a circulating fluidized bed boiler component is subjected to sand blasting roughening; secondly, acetone and ethyl alcohol are successively used for washing the surface obtained after sand blasting roughening, and drying is conducted; and thirdly, a Cr3C2-NiCr-WC-Si3N4 particle layer bonded to the roughened and completely-cleaned surface through nitrocellulose, the thickness of the particle layer ranges from 0.5 mm to 1.5 mm, a laser is used for lap joint, and according to the laser phase change technology conditions, the laser power ranges from 1200 W to 2000 W, the scanning speed ranges from 600 mm/min to 1000 mm/min, the diameter of light spots ranges from 4 mm to 8 mm, and the lap joint rate ranges from 15% to 25%. When the coating is used for the circulating fluidized bed boiler, high-temperature corrosion resistance and high-temperature abrasion resistance can be achieved, and the coating is firm and does not disengage.
Description
Technical field
The present invention relates to field of material technology, the system of more particularly, to a kind of CFBB is high temperature resistant wear-resistant erosion resisting coating
Preparation Method.
Background technology
From the difference of conventional boiler, CFBB is that its combustion system is different, gas-solid feed separation equipment and solid
Body Recycle of material equipment is the principal character of CFBB.The burning of CFBB includes inside and outside circulation
Two processes, interior circulation is the cyclic process in burner hearth, the turbulent perturbation pole that is, flue gas of high-speed motion is carried with it in stove
Strong solid particle close contact, and have the fluidized combustion course of reaction of a large amount of solid back-mixings.And outer circulation is will outside stove
The solid particle of most high temperature is collected, and returns them to the process participating in again in stove burning.This special burning
Mode makes CFBB have the unexistent feature of many conventional boiler.
Special combustion system brings series of advantages for recirculating fluidized bed, but also result in heating surface tubes in boilers simultaneously
High temperature wear and corrosion.This defect is never preferably solved, and limits pushing away further of CFBB
Wide application.
The heating surface tube of CFBB includes water-cooling wall, superheater, reheater, economizer and flue etc., domestic
The CFBB manufacturing mostly also is disposed with pipe laying heating surface in emulsion zone.Compared with other types boiler, recycle stream
The working condition of the heating surface tube of fluidized bed boiler is more severe, and it weares and teares and solid material concentration, flue gas flow rate, particle characteristics etc.
Factor is closely related.The coal of burning in circulating fluid bed boiler mostly is low heat value colm (gangue, mud coal etc.), solid material
The average particle size of (including fuel, desulfurizing agent lime stone, bed etc.) is 0-8mm, and the coal powder size that coal-powder boiler uses is only
20-50 μm about, the solid material concentration of combustion chamber emulsion zone is up to 100-100kg/m3, dilute-phase zone is also 5-50kg/m3,
Arrive hundreds of times for tens times of pulverized-coal fired boiler；Flying dust containing 10-20% in the high-temperature flue gas that material burning is formed, contains in flying dust
There is dystectic hard particles (predominantly SiO2), its operating air velocity is averagely up to 4-10m/s；Additionally, also contain in flue gas CO,
H2S、SO2, the corrosive gas such as HC1.
Therefore CFBB coating must have good heat conductivility, and thermal coefficient of expansion and base material phase
Closely, to avoid coating shedding, and high-temperature corrosion resistance and high temperature abrasion are wanted.
Content of the invention
It is an object of the invention to proposing a kind of preparation method of the high temperature resistant wear-resistant erosion resisting coating of CFBB, described
Coating be used for during CFBB can high-temperature corrosion resistance and high temperature abrasion, and coating firmly do not fall off.
For reaching this purpose, the present invention employs the following technical solutions：
A kind of laser transformation preparation method of recirculating fluidized bed is high temperature resistant wear-resistant erosion resisting coating, it includes：
(1) CFBB parts surface sandblasting is roughened；
(2) wash the surface of described sandblasting roughening with acetone and ethanol priority, and be dried；
(3) the surface nitrocellulose after being roughened and cleaning up bonds Cr3C2-NiCr-WC-Si3N4Stratum granulosum, institute
Stating stratum granulosum thickness is 0.5-1.5mm, is overlapped with laser, described laser transformation process conditions include：Laser power 1200-
2000W, sweep speed 600-1000mm/min, spot diameter 4-8mm, overlapping rate 15-25%.
Preferably, Cr of the present invention3C2-NiCr-WC-Si3N4Particle, its weight is than for 5-3:1:0.5-2.
The present invention adopts laser transformation technique, its synchronous CFBB base that described strengthening material penetrates into high temperature
The surface of body, forms new high temperature resistant wear-resistant erosion resisting coating.
The Laser Strengthening Layer being formed due to described laser lap technique, is carried out fusing using the laser of high-energy and penetrates into, because
This its strengthening layer crystal grain of being formed is tiny, and strengthening layer compacts fine and closely woven, and therefore it can improve high-temperature corrosion resistance and high temperature resistant abrasion effect
Really.
The present invention passes through to select specific heat resistant and wear resistant erosion resisting coating composition, and combines with specific technique, in circulation
Fluidized-bed combustion boiler surface prepares high-temperature corrosion resistance and the coating of high temperature abrasion, solves prior art indeterminable scarce
Fall into.
The coating that the present invention prepares, its microhardness is in 920HV0.981More than, at 30 ° of erosion angles and 90 ° of erosion angles
Under, its Wear rate is well below matrix, simply the 10% about of matrix.Described coating being capable of high-temperature corrosion resistance and high temperature mill
Lose, and coating does not firmly fall off.
The coating that the present invention prepares, through actually used 2400 hours, shut-down inspection surface, have no obvious and corrode and grind
Erosion is it was demonstrated that coating that the present invention prepares can solve the problem that the defect of prior art it is achieved that high-temperature corrosion resistance and high temperature resistant mill
The technique effect of erosion
Specific embodiment
To further illustrate technical scheme below by specific embodiment.
Embodiment 1
A kind of preparation method of CFBB is high temperature resistant wear-resistant erosion resisting coating, it includes：
(1) CFBB parts surface sandblasting is roughened；
(2) wash the surface of described sandblasting roughening with acetone and ethanol priority, and be dried；
(3) the surface nitrocellulose after being roughened and cleaning up bonds Cr3C2-NiCr-WC-Si3N4Stratum granulosum, institute
Stating stratum granulosum thickness is 0.5mm, is overlapped with laser, described laser transformation process conditions include：Laser power 1200W, sweeps
Retouch speed 600mm/min, spot diameter 4mm, overlapping rate 15%.
Embodiment 2
A kind of preparation method of CFBB is high temperature resistant wear-resistant erosion resisting coating, it includes：
(1) CFBB parts surface sandblasting is roughened；
(2) wash the surface of described sandblasting roughening with acetone and ethanol priority, and be dried；
(3) the surface nitrocellulose after being roughened and cleaning up bonds Cr3C2-NiCr-WC-Si3N4Stratum granulosum, institute
Stating stratum granulosum thickness is 1.5mm, is overlapped with laser, described laser transformation process conditions include：Laser power 2000W, sweeps
Retouch speed 1000mm/min, spot diameter 8mm, overlapping rate 25%.
Embodiment 3
A kind of preparation method of CFBB is high temperature resistant wear-resistant erosion resisting coating, it includes：
(1) CFBB parts surface sandblasting is roughened；
(2) wash the surface of described sandblasting roughening with acetone and ethanol priority, and be dried；
(3) the surface nitrocellulose after being roughened and cleaning up bonds Cr3C2-NiCr-WC-Si3N4Stratum granulosum, institute
Stating stratum granulosum thickness is 1mm, is overlapped with laser, described laser transformation process conditions include：Laser power 1600W, scanning
Speed 800mm/min, spot diameter 6mm, overlapping rate 20%.
The coating that embodiment 1-3 prepares, through actually used 2400 hours, shut-down inspection surface, have no obvious corrosion
With abrasion it was demonstrated that coating that the present invention prepares can solve the problem that the defect of prior art it is achieved that high-temperature corrosion resistance and Nai Gao
The technique effect of temperature abrasion.
Claims (2)
1. the laser transformation preparation method of the high temperature resistant wear-resistant erosion resisting coating of a kind of recirculating fluidized bed, it includes：
(1) CFBB parts surface sandblasting is roughened；
(2) wash the surface of described sandblasting roughening with acetone and ethanol priority, and be dried；
(3) the surface nitrocellulose after being roughened and cleaning up bonds Cr3C2-NiCr-WC-Si3N4Stratum granulosum, described particle
Thickness degree is 0.5-1.5mm, is overlapped with laser, described laser transformation process conditions include：Laser power 1200-2000W,
Sweep speed 600-1000mm/min, spot diameter 4-8mm, overlapping rate 15-25%.
2. the preparation method of the high temperature resistant wear-resistant erosion resisting coating of CFBB as claimed in claim 1 is it is characterised in that institute
The Cr stating3C2-NiCr-WC-Si3N4Particle, its weight is than for 5-3:1:0.5-2:0.5-2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611027968.9A CN106400008A (en) | 2016-11-18 | 2016-11-18 | Preparing method for high-temperature-resisting and abrasion-resisting coating of circulating fluidized bed boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611027968.9A CN106400008A (en) | 2016-11-18 | 2016-11-18 | Preparing method for high-temperature-resisting and abrasion-resisting coating of circulating fluidized bed boiler |
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| CN106400008A true CN106400008A (en) | 2017-02-15 |
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|---|---|---|---|
| CN201611027968.9A Pending CN106400008A (en) | 2016-11-18 | 2016-11-18 | Preparing method for high-temperature-resisting and abrasion-resisting coating of circulating fluidized bed boiler |
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Citations (6)
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| US4706579A (en) * | 1986-08-21 | 1987-11-17 | Betz Laboratories, Inc. | Method of reducing fireside deposition from the combustion of solid fuels |
| US5766542A (en) * | 1995-04-07 | 1998-06-16 | Hylsa, S.A. De C.V. | Refractory bricks for iron ore reduction reactors |
| CN102560505A (en) * | 2010-12-17 | 2012-07-11 | 中国石油大学(华东) | Composite abrasion-resisting corrosion-resisting self-lubricating film and preparation method thereof |
| CN102836996A (en) * | 2012-07-13 | 2012-12-26 | 苏州大学 | Solid lubricating high-temperature anti-wearing powder composition and preparation method of compound coating of composition |
| CN103442904A (en) * | 2010-12-15 | 2013-12-11 | 默克专利股份有限公司 | Process for creating three-dimensional patterns in coatings |
| CN105082812A (en) * | 2014-05-23 | 2015-11-25 | 默克专利股份有限公司 | Method for the laser treatment of coatings |
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2016
- 2016-11-18 CN CN201611027968.9A patent/CN106400008A/en active Pending
Patent Citations (6)
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|---|---|---|---|---|
| US4706579A (en) * | 1986-08-21 | 1987-11-17 | Betz Laboratories, Inc. | Method of reducing fireside deposition from the combustion of solid fuels |
| US5766542A (en) * | 1995-04-07 | 1998-06-16 | Hylsa, S.A. De C.V. | Refractory bricks for iron ore reduction reactors |
| CN103442904A (en) * | 2010-12-15 | 2013-12-11 | 默克专利股份有限公司 | Process for creating three-dimensional patterns in coatings |
| CN102560505A (en) * | 2010-12-17 | 2012-07-11 | 中国石油大学(华东) | Composite abrasion-resisting corrosion-resisting self-lubricating film and preparation method thereof |
| CN102836996A (en) * | 2012-07-13 | 2012-12-26 | 苏州大学 | Solid lubricating high-temperature anti-wearing powder composition and preparation method of compound coating of composition |
| CN105082812A (en) * | 2014-05-23 | 2015-11-25 | 默克专利股份有限公司 | Method for the laser treatment of coatings |
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| 吴燕明等: "《表面工程与再制造技术-热喷涂替代电镀铬研究与应用》", 31 May 2016, 中国水利水电出版社 * |
| 张九渊: "《表面工程与失效分析》", 30 June 2005, 浙江大学出版社 * |
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Application publication date: 20170215 |