CN106435450A - Preparation method of high-temperature-resistant anti-abrasion coating of circulating fluidized bed boiler - Google Patents
Preparation method of high-temperature-resistant anti-abrasion coating of circulating fluidized bed boiler Download PDFInfo
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- CN106435450A CN106435450A CN201611011510.4A CN201611011510A CN106435450A CN 106435450 A CN106435450 A CN 106435450A CN 201611011510 A CN201611011510 A CN 201611011510A CN 106435450 A CN106435450 A CN 106435450A
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- coating
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- cfbb
- fluidized bed
- high temperature
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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
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
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- 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
- C22C29/06—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 based on carbides, but not containing other metal compounds
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Coating By Spraying Or Casting (AREA)
Abstract
The invention discloses a preparation method of a high-temperature-resistant anti-abrasion coating of a circulating fluidized bed boiler. The preparation method comprises the steps that 1, sand blasting and roughening are conducted on the surfaces of parts of the circulating fluidized bed boiler; 2, the surfaces subjected to sand blasting and roughening are washed with acetone and ethanol successively; 3, a NiCrAlY intermediate coating is plasma-sprayed to the surfaces obtained after roughening and thorough cleaning, and then Cr3C2-NiCr-WC particles are plasma-sprayed, wherein the conditions of a plasma-spraying process include main gas pressure of 0.7-1.0 MPa, auxiliary gas pressure of 0.6-0.9 MPa, main gas flow of 1300-1800 l/h, auxiliary gas flow of 900-1100 l/h, arc current of 450-600 A, arc voltage of 85-100V, powder delivery gas pressure of 0.2-0.4 MPa, powder delivery gas flow of 280-400 l/h, spraying distance of 100-150 mm, spraying speed of 2-3 kg/h and coating thickness of 1-2.5 mm. The coating can be resistant to high-temperature corrosion and high-temperature abrasion when being used for the circulating fluidized bed boiler, is firm and does not shed.
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 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 plasma spraying NiCrAlY inter coat after being roughened and cleaning up, subsequent plasma spraying
Cr3C2- NiCr-WC particle, described plasma spray coating process condition includes：Main atmospheric pressure 0.7-1.0MPa, auxiliary atmospheric pressure 0.6-
0.9MPa, primary air amount 1300-1800l/h, auxiliary throughput 900-1100l/h, arc current 450-600A, arc voltage 85-100V,
Powder feeding atmospheric pressure 0.2-0.4MPa, powder feeding throughput 280-400l/h, spray distance 100-150mm, spraying rate 2-3kg/h,
Coating layer thickness 1-2.5mm.
Preferably, Cr of the present invention3C2- NiCr-WC particle, its weight is than for 5-3:1:0.5-2.
Midcoat thickness of the present invention is 0.2-0.6mm, Cr3C2- NiCr-WC coating layer thickness is 0.8-2.3mm,
Total coating thickness is 1-2.5mm.
The present invention selects NiCrAlY alloy powder as gradient ceramic coating intermediate layer.NiCrAlY alloy powder is to use
The alloy powder that temperature is higher, high-temperature comprehensive property is excellent.Al is strong deoxidier, therefore Al2O3External agency can be suppressed to mother
The corrosion further of material metal.And the hardness of Cr is high, the Cr of generation2O3Oxide-film can not only stop gas further to coating
Oxidation, can also strengthen the wearability of coating simultaneously.The addition of a small amount of yttrium, can promote the α-Al with protectiveness2O3The shape of film
Become, improve the adhesiveness of Ni-Cr-Al alloy oxide film and matrix, prevent the peeling of oxide-film；Increase bond strength and improve painting
The antioxygenic property of layer.
As first containing the very outstanding alloy of Al and Cr both corrosion resisting properties in the NiCrAlY alloy of bond coating
Element, forms one layer of fine and close oxide-film in alloy surface, stops interface oxygen atom from passing through the inside diffusion of oxide-film, and oxygen
Changing film being capable of intactly covering alloy surface.In addition the addition of alloy Y, can promote the α-Al with protectiveness2O3The formation of film,
Improve the adhesiveness of Ni-Cr-Al alloy oxide film and matrix, prevent the peeling of oxide-film.Plasma spraying ceramic coat is again right
Bottom has played good covering protection effect, further increases the corrosion resisting property of alloy.
NiCrAlY of the present invention, between its each composition, ratio does not do specific restriction, as long as each composition reaches effectively
Measure, for example, its atomic ratio ratio can be 1:1:2:0.3,1:1.5:3:0.5.
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.
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 plasma spraying NiCrAlY inter coat after being roughened and cleaning up, subsequent plasma spraying
Cr3C2- NiCr-WC particle, described plasma spray coating process condition includes：Main atmospheric pressure 0.7MPa, auxiliary atmospheric pressure 0.6MPa, main
Throughput 1300l/h, auxiliary throughput 900l/h, arc current 450A, arc voltage 85V, powder feeding atmospheric pressure 0.2MPa, powder feeding throughput
280l/h, spray distance 100mm, spraying rate 2kg/h, coating layer thickness 1mm.
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 plasma spraying NiCrAlY inter coat after being roughened and cleaning up, subsequent plasma spraying
Cr3C2- NiCr-WC particle, described plasma spray coating process condition includes：Main atmospheric pressure 1.0MPa, auxiliary atmospheric pressure 0.9MPa, main
Throughput 1800l/h, auxiliary throughput 1100l/h, arc current 600A, arc voltage 100V, powder feeding atmospheric pressure 0.4MPa, powder feeding air-flow
Amount 400l/h, spray distance 150mm, spraying rate 3kg/h, coating layer thickness 2.5mm.
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 plasma spraying NiCrAlY inter coat after being roughened and cleaning up, subsequent plasma spraying
Cr3C2- NiCr-WC particle, described plasma spray coating process condition includes：Main atmospheric pressure 0.8MPa, auxiliary atmospheric pressure 0.7MPa, main
Throughput 1500l/h, auxiliary throughput 1000l/h, arc current 500A, arc voltage 90V, powder feeding atmospheric pressure 0.3MPa, powder feeding air-flow
Amount 350l/h, spray distance 120mm, spraying rate 2.5kg/h, coating layer thickness 2mm.
The coating that embodiment 1-2 prepares, through actually used 100 hours, shut-down inspection surface, have no obvious corrosion and
Abrasion 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
The technique effect of abrasion.
Claims (3)
1. the preparation method of the high temperature resistant wear-resistant erosion resisting coating of a kind of CFBB, 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 plasma spraying NiCrAlY inter coat after being roughened and cleaning up, subsequent plasma spraying Cr3C2-
NiCr-WC particle, described plasma spray coating process condition includes：Main atmospheric pressure 0.7-1.0MPa, auxiliary atmospheric pressure 0.6-0.9MPa,
Primary air amount 1300-1800l/h, auxiliary throughput 900-1100l/h, arc current 450-600A, arc voltage 85-100V, powder feeding gas
Pressure 0.2-0.4MPa, powder feeding throughput 280-400l/h, spray distance 100-150mm, spraying rate 2-3kg/h, thick coating
Degree 1-2.5mm.
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 particle, its weight is than for 5-3:1:0.5-2.
3. the preparation method of the high temperature resistant wear-resistant erosion resisting coating of CFBB as claimed in claim 1 or 2, its feature exists
In described midcoat thickness is 0.2-0.6mm, Cr3C2- NiCr-WC coating layer thickness is 0.8-2.3mm, and total coating thickness is
1-2.5mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611011510.4A CN106435450A (en) | 2016-11-17 | 2016-11-17 | Preparation method of high-temperature-resistant anti-abrasion coating of circulating fluidized bed boiler |
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| CN201611011510.4A CN106435450A (en) | 2016-11-17 | 2016-11-17 | Preparation method of high-temperature-resistant anti-abrasion coating of circulating fluidized bed boiler |
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Cited By (4)
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| CN108101062A (en) * | 2018-01-17 | 2018-06-01 | 江苏中能硅业科技发展有限公司 | A kind of preparation process of polycrystalline silicon reducing furnace and its furnace tube inner wall functional layer |
| CN108468010A (en) * | 2018-03-02 | 2018-08-31 | 江苏保捷精锻有限公司 | A kind of superhard wear-resistant composite material precision bearing outer ring and its processing technology |
| CN115852236A (en) * | 2022-12-07 | 2023-03-28 | 陕西柴油机重工有限公司 | Preparation method of large-tonnage thick-large-section wind power main frame |
| CN116790895A (en) * | 2023-07-01 | 2023-09-22 | 常州市凯宏铝业有限公司 | Method for removing impurities from waste aluminum materials in production of regenerated aluminum plates |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108101062A (en) * | 2018-01-17 | 2018-06-01 | 江苏中能硅业科技发展有限公司 | A kind of preparation process of polycrystalline silicon reducing furnace and its furnace tube inner wall functional layer |
| CN108468010A (en) * | 2018-03-02 | 2018-08-31 | 江苏保捷精锻有限公司 | A kind of superhard wear-resistant composite material precision bearing outer ring and its processing technology |
| CN115852236A (en) * | 2022-12-07 | 2023-03-28 | 陕西柴油机重工有限公司 | Preparation method of large-tonnage thick-large-section wind power main frame |
| CN116790895A (en) * | 2023-07-01 | 2023-09-22 | 常州市凯宏铝业有限公司 | Method for removing impurities from waste aluminum materials in production of regenerated aluminum plates |
| CN116790895B (en) * | 2023-07-01 | 2024-02-02 | 常州市凯宏铝业有限公司 | Method for removing impurities from waste aluminum materials in production of regenerated aluminum plates |
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Application publication date: 20170222 |