CN107955927B - Corrosion-resistant grounding grid metal ceramic coating anti-drop spraying device and spraying method - Google Patents
Corrosion-resistant grounding grid metal ceramic coating anti-drop spraying device and spraying method Download PDFInfo
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- CN107955927B CN107955927B CN201711328296.XA CN201711328296A CN107955927B CN 107955927 B CN107955927 B CN 107955927B CN 201711328296 A CN201711328296 A CN 201711328296A CN 107955927 B CN107955927 B CN 107955927B
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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
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/129—Flame spraying
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Abstract
Corrosion-resistant grounding grid metal ceramicThe ceramic coating anti-falling spraying device comprises a first combustion chamber and a second combustion chamberTwo (II)A combustion chamber, a first combustion chamber, a second combustion chamberTwo (II)The combustion chamber is connected with the Laval nozzle and the nozzle in sequence; far from the first combustion chamberTwo (II)One end of the combustion chamber is provided with a fuel nozzle and an oxygen nozzle, two sides of the first combustion chamber are provided with a first powder feeding nozzle, and the first combustion chamber is provided with a second powder feeding nozzleTwo (II)The two sides of the combustion chamber are sequentially provided with a first part and a second partTwo (II)The powder feeding nozzle and the dust absorber are arranged on two sides of the nozzle, and the dust absorber and the gas separator are used for separating and removing unmelted dust and gas impurities respectively. According to the anti-falling spraying device for the corrosion-resistant grounding grid metal ceramic coating, provided by the invention, the multistage combustion chamber, the dust absorber and the gas separator are arranged, so that good corrosion resistance and conductivity can be ensured, the metal coating is not easy to fall off, and the service life of the grounding grid is prolonged.
Description
Technical Field
The invention relates to the field of metal material processing, in particular to a corrosion-resistant grounding grid metal ceramic coating anti-falling spraying device and a spraying method.
Background
The grounding grid of the power system transformer substation can ensure the safe operation of the transformer substation and the life safety, but the grounding grid is buried underground, water, salt, oxygen, microorganisms and the like in the soil erode the grounding grid, and if the maintenance is not timely carried out, the grounding grid material becomes brittle, layer-forming, loose and even breaks, so that the high potential difference occurs when the grounding resistance is increased, and the personal safety and the stable operation of the transformer substation are seriously jeopardized. The metal coating can better prevent the soil from corroding the transformer substation grounding grid, and is one of effective means for solving the corrosion prevention problem of the transformer substation grounding grid.
The existing grounding anti-corrosion measures comprise a cathode protection method, a hot galvanizing method, a pure copper access method and the like, wherein the methods have defects, such as a sacrificial anode method and a forced current method, the cathode protection method is not suitable for being used in an environment with high resistivity, and the maintenance and management work of the latter method is complex and the workload is high; when the hot galvanizing method has the current effect, the hot galvanizing layer can not effectively prevent the corrosion of the grounding grid; the pure copper access method has the problems of soil pollution, high price and the like.
Compared with the technologies of arc spraying, plasma spraying, explosion spraying and the like, the supersonic flame spraying technology is a thermal spraying technology, has the advantage of preparing a coating, and particularly has wide application prospect for a metal ceramic coating. The nickel-based titanium nitride coating has a series of advantages of high strength, high hardness, high temperature resistance, acid and alkali corrosion resistance and the like, and has wide application in the industries of tool processing, mechanical parts, decoration and the like. However, the existing supersonic flame spraying technology still has the problems of high flame temperature, low flame flow velocity, high oxygen content of the coating, easy falling of the coating and the like.
Chinese patent "pseudo-alloy anticorrosive coating for electric power system grounding grid" [ publication No.: c two 101980403A proposes a method for carrying out corrosion protection treatment on a grounding grid by using a pseudo alloy coating, wherein the pseudo alloy comprises 12-30% of aluminum, 6-15% of copper and the balance of zinc, and the coating has certain metal pollution to soil and has the problems of high price and the like. Chinese patent, "a supersonic flame spraying device", "publication No.: c two 201933144U) proposes a supersonic flame spraying device, in which an inert gas nozzle is provided in a temperature control chamber for injecting a low-temperature inert gas to reduce the temperature of the gas flow, but the inert gas is not exactly described, so that the problem of coating falling cannot be solved.
Disclosure of Invention
The invention aims to solve the technical problem of providing the anti-falling spraying device and the spraying method for the metal ceramic coating of the corrosion-resistant grounding grid, which can improve the compactness of the metal ceramic coating, reduce the oxygen content of the coating, eliminate the gas impurities in the coating, and control the surface temperature of the spraying device, thereby ensuring good corrosion resistance and conductivity, ensuring that the metal coating is not easy to fall off, and prolonging the service life of the grounding grid.
In order to solve the technical problems, the invention adopts the following technical scheme:
a corrosion-resistant grounding grid metal ceramic coating anti-drop spraying device comprises a first combustion chamber and a second combustion chamberTwo (II)A combustion chamber, a first combustion chamber, a second combustion chamberTwo (II)The combustion chamber is connected with the Laval nozzle and the nozzle in sequence; far from the first combustion chamberTwo (II)One end of the combustion chamber is provided with a fuel nozzle and an oxygen nozzle, two sides of the first combustion chamber are provided with a first powder feeding nozzle, and the first combustion chamber is provided with a second powder feeding nozzleTwo (II)The two sides of the combustion chamber are sequentially provided with a first part and a second partTwo (II)The powder feeding nozzle and the dust absorber are arranged on two sides of the nozzle, and the dust absorber and the gas separator are used for separating and removing unmelted dust and gas impurities respectively.
The first combustion chamber isTwo (II)The surface of the combustion chamber is covered with a water cooling system, the water inlet of the water cooling system is arranged at one side of the first combustion chamber, and the water outlet is symmetrically distributed at the first combustion chamberTwo (II)And two sides of the combustion chamber.
The saidFirst powder feeding nozzle and firstTwo (II)Powder feeding nozzle, first combustion chamber and second combustion chamberTwo (II)The combustion chamber is inclined and directed in the powder injection direction.
The dust absorber is a CJMA, CJMB type high-voltage electrostatic precipitator
The gas separator is a cyclone type gas-water separator.
The dust absorber and the gas separator are respectively close to the front end and the rear end of the Laval nozzle. The dust removal and dehumidification are carried out after the two metal ceramic powders are in a fully molten and mixed state.
A corrosion-resistant grounding grid metal ceramic coating anti-drop spraying method comprises the following steps:
1) Respectively through a first powder feeding nozzle and a first powder feeding nozzleTwo (II)The powder feeding nozzle is used for feeding two kinds of powder with different melting points into a first combustion chamber and a second combustion chamber, wherein the first combustion chamber is used for heating powder with a higher melting point to a molten state, and the second combustion chamber is used for heating powder with a lower melting point to the molten state;
2) The powder in the two molten states meet and are fully mixed under the action of high-temperature combustion gas, and when the powder passes through the Laval nozzle, the powder in the molten state is dedusted by a dust absorber; dehumidifying the powder in a molten state by a gas separator;
3) And spraying the powder in a molten state obtained after dust removal and dehumidification through a nozzle, and solidifying to form the metal ceramic coating.
The surfaces of the first combustion chamber and the second combustion chamber are provided with water cooling systems, and the temperature of the water cooling systems is controlled to be higher than the melting temperature of powder and lower than the oxidation temperature of powder.
According to the anti-drop spraying method for the corrosion-resistant grounding grid metal ceramic coating, the multistage combustion chambers are additionally arranged and can be used for heating powder with different melting points to a molten state and fully mixing the powder, so that the amount of unmelted dust can be reduced, meanwhile, high-melting-point powder is introduced into a first combustion chamber close to ignition, low-melting-point powder is introduced into a subsequent second combustion chamber, automatic temperature control is performed by utilizing the distance from combustion gas, the temperature control process is simplified, and the arrangement of the multistage combustion chambers is beneficial to ensuring full melting and mixing with low-melting-point powder by prolonging the spraying distance, so that the uniformity is improved; the water cooling system is arranged, so that the temperature of the surface of the multistage combustion chamber can be effectively controlled, the powder is prevented from being oxidized due to overhigh temperature, and the powder is in a molten state; the dust absorber is additionally arranged for separating unmelted dust from molten spray materials and absorbing unmelted powder, so that the compactness of the metal coating is improved; through setting up gas separator and being used for separating gaseous impurity such as oxygen and molten state spray material and absorbing gaseous impurity to reduce the air gap in the cermet coating, effectively prevent the drop of coating, extension ground net's life.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is a schematic diagram of the present invention.
In the figure: the device comprises a fuel nozzle 1, an oxygen nozzle 2, an igniter 3, a first powder feeding nozzle 4, a second powder feeding nozzle 5, a first combustion chamber 6, a second combustion chamber 7, a water cooling system 8, a dust absorber 9, a Laval nozzle 10, a gas separator 11 and a nozzle 12.
Detailed Description
As shown in fig. 1, the anti-falling spraying device for the corrosion-resistant grounding grid metal ceramic coating comprises a first powder feeding nozzle 4, a second powder feeding nozzle 5, a first combustion chamber 6, a second combustion chamber 7, a water cooling system 8, a dust absorber 9, a Laval nozzle 10, a gas separator 11 and a nozzle 12.
The first combustion chamber 6 is connected with the second combustion chamber 7, wherein the first combustion chamber 6 is used for heating powder with a higher melting point to a molten state, and the second combustion chamber 7 is used for heating powder with a lower melting point to the molten state and meeting the powder with the higher melting point in the molten state. Away from the first combustion chamber 6Two (II)One end of the combustion chamber 7 is provided with a fuel nozzle 1, an oxygen nozzle 2, and an igniter 3 is arranged above the first combustion chamber 6, and the fuel nozzle 1, the oxygen nozzle 2 and the igniter 3 are used for introducing fuel and oxygen and igniting the fuel and the oxygen to generate high-temperature and high-pressure gas flame flow.
The first powder feeding nozzles 4 are symmetrically distributed on two sides of the first combustion chamber 6 and are used for feeding powder with a higher melting point into the first combustion chamber 6. In order to accelerate the injection speed, the first powder feeding nozzle 4 and the first combustion chamber 6 are in a non-90-degree structure and are directed in the injection direction.
The second powder feeding nozzles 5 are symmetrically distributed on two sides of the second combustion chamber and are used for feeding powder with a lower melting point into the second combustion chamber 7, and the second powder feeding nozzles 5 and the second combustion chamber 7 are of a non-90-degree structure, so that the full mixing of the powder with the two melting points can be enhanced, and the injection speed can be increased.
The water cooling system 8 is covered on the surfaces of the first combustion chamber 6 and the second combustion chamber 7, the water inlet is arranged on one side of the first combustion chamber 6 far away from the second combustion chamber 7, and the water outlets are symmetrically distributed on two sides of the second combustion chamber 7 and are used for controlling the surface temperatures of the first combustion chamber 6 and the second combustion chamber 7. The surface temperature is determined according to the melting point of the introduced metal ceramic powder, so that the metal ceramic powder is ensured to be in a molten state, and oxidation is avoided.
The front end of the Laval nozzle 10 is connected with the second combustion chamber 7, and the rear end is connected with the nozzle 12.
The dust absorbers 9 are symmetrically distributed on two sides of the second combustion chamber 7 close to the Laval nozzle 10, specifically, CJMA and CJMB type high-voltage electrostatic precipitators are adopted, and the dust absorbers 9 are used for enabling unmelted powder with a higher melting point and powder with a lower melting point to enter a strong electric field along with air flow through an electrostatic field secondary principle, so that fine powder particles are positively charged. When charged particles reach an electric field between the absorber collection trays, the particles are attracted by the metal sucker and adhere to the metal tray, so that dust is separated from powder in an empty molten state, and a purifying effect is achieved.
The gas separators 11 are symmetrically distributed on two sides of the nozzle 12 close to the Laval nozzle 10, and specifically, cyclone gas-water separators are adopted. The gas separator 11 separates gas impurities such as oxygen and the like from the molten spray material by adopting the principle of different mass, so that the compactness of the coating is improved, the oxygen content of the coating is reduced, the gaps of the coating are reduced, and the coating is effectively prevented from falling off.
A corrosion-resistant grounding grid metal ceramic coating anti-drop spraying method comprises the following steps:
1) Respectively through the first powder feeding nozzle 4 and the first powder feeding nozzleTwo (II)The powder feeding nozzle 5 is used for adding two kinds of metal ceramic powder with different melting points into a first combustion chamber 6 and a second combustion chamber 7, the first combustion chamber 6 is used for heating metal ceramic powder with higher melting point to a molten state, and the second combustion chamber 7 is used for heating metal ceramic powder with lower melting point to the molten state;
2) The two metal ceramic powders in the molten state meet and are fully mixed under the action of high-temperature combustion gas, and the metal ceramic powder in the molten state is dedusted by a dust absorber 9 when passing through the front and back of a Laval nozzle 10; the cermet powder in the molten state is dehumidified by a gas separator 11;
3) The powder in the molten state obtained after dust removal and dehumidification is sprayed out through a nozzle 12, and solidified into a metal ceramic coating on the surface of the grounding grid.
Claims (6)
1. A corrosion-resistant grounding grid metal ceramic coating anti-drop spraying method is characterized in that: the anti-drop spraying device for the metal ceramic coating of the corrosion-resistant grounding grid comprises a first combustion chamber (6) and a second combustion chamber (7), wherein the first combustion chamber (6) and the second combustion chamber (7) are sequentially connected with a Laval nozzle (10) and a spray nozzle (12); one end, far away from the second combustion chamber (7), of the first combustion chamber (6) is provided with a fuel nozzle (1) and an oxygen nozzle (2), two sides of the first combustion chamber (6) are provided with a first powder feeding nozzle (4), two sides of the second combustion chamber (7) are sequentially provided with a second powder feeding nozzle (5) and a dust absorber (9), two sides of the nozzle (12) are provided with a gas separator (11), and the dust absorber (9) and the gas separator (11) separate and remove unmelted dust and gas impurities respectively;
the anti-drop spraying method of the corrosion-resistant grounding grid metal ceramic coating comprises the following steps:
1) Two kinds of powder with different melting points are added into a first combustion chamber (6) and a second combustion chamber (7) through a first powder feeding nozzle (4) and a second powder feeding nozzle (5), the first combustion chamber (6) is used for heating powder with higher melting point to a molten state, and the second combustion chamber (7) is used for heating powder with lower melting point to the molten state;
2) The two kinds of powder in the molten state meet and are fully mixed under the action of high-temperature combustion gas, and when the powder passes through the Laval nozzle (10) before and after, the powder in the molten state is dedusted by the dust absorber (9); dehumidifying the powder in a molten state by a gas separator (11);
3) And spraying the powder in a molten state obtained after dust removal and dehumidification through a nozzle (12), and solidifying to form the metal ceramic coating.
2. The anti-falling spraying method for the corrosion-resistant grounding grid metal ceramic coating, according to claim 1, is characterized in that: the surfaces of the first combustion chamber (6) and the second combustion chamber (7) are covered with a water cooling system, the water inlet of the water cooling system is arranged on one side of the first combustion chamber (6), and the water outlets of the water cooling system are symmetrically distributed on two sides of the second combustion chamber (7).
3. The anti-falling spraying method for the corrosion-resistant grounding grid metal ceramic coating, according to claim 1, is characterized in that: the first powder feeding nozzle (4) and the second powder feeding nozzle (5) are inclined with the first combustion chamber (6) and the second combustion chamber (7) and point to the powder injection direction.
4. The anti-falling spraying method for the corrosion-resistant grounding grid metal ceramic coating, according to claim 1, is characterized in that: the dust absorber (9) is a CJMA and CJMB type high-voltage electrostatic precipitator.
5. The anti-falling spraying method for the corrosion-resistant grounding grid metal ceramic coating, according to claim 1, is characterized in that: the gas separator (11) is a cyclone type gas-water separator.
6. The anti-falling spraying method for the corrosion-resistant grounding grid metal ceramic coating, according to claim 1, is characterized in that: the dust absorber (9) and the gas separator (11) are respectively close to the front end and the rear end of the Laval nozzle (10).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711328296.XA CN107955927B (en) | 2017-12-13 | 2017-12-13 | Corrosion-resistant grounding grid metal ceramic coating anti-drop spraying device and spraying method |
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| CN201711328296.XA CN107955927B (en) | 2017-12-13 | 2017-12-13 | Corrosion-resistant grounding grid metal ceramic coating anti-drop spraying device and spraying method |
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| CN107955927A CN107955927A (en) | 2018-04-24 |
| CN107955927B true CN107955927B (en) | 2023-09-29 |
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| CN112676054A (en) * | 2020-12-17 | 2021-04-20 | 青岛科技大学 | Vortex guide type supersonic flame spraying spray gun device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06198127A (en) * | 1993-01-05 | 1994-07-19 | Hokkaido Electric Power Co Inc:The | Waste gas treating device |
| CN201620186U (en) * | 2009-12-23 | 2010-11-03 | 广州有色金属研究院 | Novel low-temperature high-speed supersonic flame spraying device |
| CN105714172A (en) * | 2016-04-14 | 2016-06-29 | 国家电网公司 | Corrosion-resistant grounding grid metal ceramic coating material and preparation device and method thereof |
| CN106064123A (en) * | 2016-06-24 | 2016-11-02 | 北京工业大学 | Temperature control rate controlling flame spray coating device and method are coordinated in a kind of classification |
| CN207646273U (en) * | 2017-12-13 | 2018-07-24 | 广东电网有限责任公司江门供电局 | A kind of corrosion resistant grounded screen metal-cermic coating anti-dropout spray equipment |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7216814B2 (en) * | 2003-10-09 | 2007-05-15 | Xiom Corp. | Apparatus for thermal spray coating |
| US7449068B2 (en) * | 2004-09-23 | 2008-11-11 | Gjl Patents, Llc | Flame spraying process and apparatus |
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- 2017-12-13 CN CN201711328296.XA patent/CN107955927B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06198127A (en) * | 1993-01-05 | 1994-07-19 | Hokkaido Electric Power Co Inc:The | Waste gas treating device |
| CN201620186U (en) * | 2009-12-23 | 2010-11-03 | 广州有色金属研究院 | Novel low-temperature high-speed supersonic flame spraying device |
| CN105714172A (en) * | 2016-04-14 | 2016-06-29 | 国家电网公司 | Corrosion-resistant grounding grid metal ceramic coating material and preparation device and method thereof |
| CN106064123A (en) * | 2016-06-24 | 2016-11-02 | 北京工业大学 | Temperature control rate controlling flame spray coating device and method are coordinated in a kind of classification |
| CN207646273U (en) * | 2017-12-13 | 2018-07-24 | 广东电网有限责任公司江门供电局 | A kind of corrosion resistant grounded screen metal-cermic coating anti-dropout spray equipment |
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