CN210736866U - Water-cooled wall anticorrosive coating structure of garbage/biomass boiler - Google Patents
Water-cooled wall anticorrosive coating structure of garbage/biomass boiler Download PDFInfo
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- CN210736866U CN210736866U CN201920986463.8U CN201920986463U CN210736866U CN 210736866 U CN210736866 U CN 210736866U CN 201920986463 U CN201920986463 U CN 201920986463U CN 210736866 U CN210736866 U CN 210736866U
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Abstract
The utility model discloses an anticorrosive coating structure of a water-cooled wall of a garbage/biomass boiler, which consists of a basal layer, an intermediate layer and a surface layer; the base layer is a nickel-clad aluminum coating, the intermediate layer is a nickel-based alloy coating, and the surface layer is a contamination-resistant ceramic coating. The utility model also discloses a rubbish biomass boiler, this boiler include foretell rubbish biomass boiler water-cooling wall anticorrosion coating structure. The advantages are that: 1) the corrosion rate of the water-cooled wall of the garbage/biomass boiler can be remarkably slowed down; 2) the problem that the tube panel is easy to deform due to the nickel-based alloy surfacing in the prior art is solved; 3) the coating structure has low porosity, small coating thickness and simple forming process, improves the production efficiency and reduces the production cost.
Description
Technical Field
The utility model belongs to the technical field of power plant boiler technique and specifically relates to a boiler water wall anticorrosive coating structure.
Background
The problem of corrosion of the heating surface of the garbage/biomass boiler is always a difficult problem. As most of the garbage/biomass fuel is bark, straw, corncob or household garbage and the like, the garbage/biomass fuel contains more Na, K and a certain amount of S, Cl and other elements, low-melting-point substances are generated in the combustion process and are attached to the surface of a heating surface to form coking, and further the pipe wall is corroded.
At present, the common corrosion prevention mode of the water cooled wall of the boiler is to weld nickel-based alloy by gas shielded welding, and practice shows that the boiler has a better corrosion prevention effect.
However, the scheme mainly has the following defects:
1. the mode of overlaying leads to large energy input, and the deformation of a tube panel of the water wall is easily caused;
2. biomass materials such as barks, straws, corncobs or household garbage in the garbage/biomass boiler generate a large amount of sulfide-containing smoke and HCl gas when being combusted, sulfides in the smoke react with metals to form metal sulfides, the HCl gas reacts with the metals to form metal chlorides, and in a special environment inside the garbage/biomass boiler, under the existence of chloride and aerobic conditions, the chloride can react with a metal oxide film on the surface to generate Cl with strong corrosivity2And if the thickness of the nickel-based alloy is too thin, part of Cl can relatively easily penetrate through the anticorrosive layer to reach the interface of the anticorrosive layer and the substrate, so that the substrate is locally corroded. In order to overcome the problem, the thickness of the surfacing needs to be increased, and usually the thickness of the surfacing needs to be more than 2mm to achieve a good anti-corrosion effect, which leads to reduction of production efficiency and very high cost.
3. The mode of overlaying the nickel-based alloy ensures that the surface of the anticorrosive layer has relatively large roughness and relatively large surface energy, so that low-melting-point substances generated in the combustion process are still easily attached to the surface of the anticorrosive layer to form coking, thereby influencing the anticorrosive performance.
SUMMERY OF THE UTILITY MODEL
In order to improve production efficiency when improving rubbish biomass boiler water-cooling wall corrosion resisting property, reduction in production cost to overcome and lead to the yielding problem of tube panel owing to build-up welding nickel base alloy, the utility model provides a rubbish biomass boiler water-cooling wall anticorrosion coating structure.
The utility model provides a technical scheme that its technical problem adopted is: the anti-corrosion coating structure of the water-cooled wall of the garbage/biomass boiler consists of a base layer, an intermediate layer and a surface layer; the base layer is a nickel-clad aluminum coating, the intermediate layer is a nickel-based alloy coating, and the surface layer is a contamination-resistant ceramic coating.
Because the nickel-coated aluminum coating can be firmly attached to the surface of the base material in a thermal spraying mode (the temperature of the base material is less than 200 ℃) and has higher bonding strength with the base material, the surface temperature of the base material is lower in the spraying process, the technical problem that a tube panel is easy to deform is solved, the production efficiency is effectively improved, the production cost is reduced, and the bonding strength of the coating and the base material is improved. On the other hand, a multi-layer system is adopted, namely the thermal spraying coating and the ceramic coating are coated on the surface of the nickel-coated aluminum coating, and the coatings are staggered with each other, so that the porosity of the coating system can be effectively reduced, the thickness of the whole coating system is reduced on the premise of the same anticorrosion performance, and the production cost is further reduced.
The contamination-resistant ceramic coating is coated on the surface of the nickel-based alloy coating, the contamination and coking conditions of the surface of the water-cooled wall in the operation process of the boiler are greatly reduced by utilizing the low surface energy of the contamination-resistant ceramic coating, and meanwhile, the contamination-resistant ceramic coating effectively blocks the pores on the surface of the thermal spraying coating and also reduces the porosity of the whole protective coating system. The surface of the nickel-based alloy coating has larger roughness, so that the adhesion between the anti-contamination ceramic coating and the nickel-based alloy coating can be completely ensured.
As will be readily understood by those skilled in the art, the contamination-resistant ceramic coating of the present invention refers to a ceramic coating having contamination resistance, which has low surface energy and can prevent contamination and coking of the water wall surface under the operating conditions of the present invention, such as a nano ceramic coating. In the specific process, which anti-contamination ceramic coating is selected should be experimentally determined by combining the fuel type and property in actual working conditions and the contamination and coking conditions of the water wall of the garbage/biomass boiler, so that the contamination and coking of the water wall can be effectively prevented by the anti-contamination ceramic coating.
The three-layer protection structure of the nickel-clad aluminum coating, the nickel-based alloy coating and the anti-contamination ceramic coating is adopted, so that the capability of a coating system for resisting the invasion of corrosive media in smoke is enhanced, and the corrosion degree of a water-cooled wall is slowed down.
It is easy to understand that the nickel base alloy material used as the nickel base alloy coating in the present invention can be selected from various nickel base alloy materials commonly used in the anticorrosion layer of the water wall of the garbage/biomass boiler, such as 622 alloy, 625 alloy, etc. Preferably, alloy 625 are solid solution strengthening type nickel base deformation superalloy with molybdenum, niobium as main strengthening element, have good corrosion-resistant and oxidation resistance, all have good tensile properties and fatigue property from low temperature to 980 ℃ to stress corrosion under the salt spray resistant atmosphere, consequently can be applied to rubbish/biomass boiler service environment, and alloy 625 material has good chlorine corrosion resistance's effect simultaneously, uses it the utility model discloses the construction of compound anticorrosive coating has better anticorrosive effect.
As a further improvement, the thickness of the basal layer is 0.03 to 0.15mm, the thickness of the middle layer is 0.3 to 0.8mm, and the thickness of the surface layer is 0.05 to 0.2 mm.
As the utility model discloses a further improvement, the thermal conductivity coefficient of anti-staining ceramic coating should be > 5W/mK, in operating condition, should be at 5 ~ 20W/mK (different coating thickness, the heat conductivity has the difference) usually, considers ceramic coating's thermal resistance problem, requires this coating to have good heat conductivility concurrently, does not have the influence to the heat conduction of water wall pipe. Experiments show that when the heat conductivity coefficient of the anti-contamination ceramic coating is larger than 5W/mK, the heat conduction of the water wall tube is not obviously adversely affected.
The utility model also discloses a rubbish biomass boiler, this boiler include foretell rubbish biomass boiler water-cooling wall anticorrosion coating structure.
The utility model has the advantages that: 1) the corrosion rate of the water-cooled wall of the garbage/biomass boiler can be remarkably slowed down; 2) the problem that the tube panel is easy to deform due to the nickel-based alloy surfacing in the prior art is solved; 3) the coating structure has low porosity, small coating thickness and simple forming process, improves the production efficiency and reduces the production cost.
Drawings
Fig. 1 is a schematic structural view of the anti-corrosion coating of the water-cooled wall of the garbage/biomass boiler of the utility model.
Labeled as: 1-nickel-coated aluminum coating, 2-nickel-based alloy coating and 3-contamination-resistant ceramic coating.
Detailed Description
The present invention will be further explained with reference to the drawings and examples.
The first embodiment is as follows:
the utility model discloses a rubbish/living beings boiler water wall anticorrosion coating structure is formed to the method that adopts:
(1) the quartz sand with edges and moderate granularity is used for carrying out spray cleaning on the surface of a water-cooled wall corrosion sensitive area, the cleanliness of the metal surface after the spray cleaning reaches grade Sa3, and the surface roughness is 20-40 mu m.
(2) And (3) carrying out thermal spraying on the nickel-coated aluminum composite material on the surface of the water cooled wall qualified by spray cleaning inspection, controlling the thickness of a spraying layer to be 0.03-0.05 mm, and inspecting whether the coating has defects.
(3) And spraying 625 alloy wire on the surface of the nickel-clad aluminum coating layer qualified by inspection by using an electric arc, controlling the spraying thickness to be 0.3-0.5 mm, and inspecting whether the coating layer has defects.
(4) And cold spraying the anti-contamination ceramic coating on the surface of the alloy 625 coating qualified in inspection, wherein the thickness of the ceramic coating is controlled to be 0.05-0.1 mm, and the surface of the alloy 625 coating is completely covered. The thermal conductivity coefficient of the anti-contamination ceramic coating is 10-20W/mK. Obtain the utility model discloses a rubbish/living beings boiler water wall anticorrosion coating structure.
(5) And (3) performing corrosion resistance test on the water-cooled wall anticorrosive coating structure of the garbage/biomass boiler, wherein the obvious corrosion does not appear on the surface of the coating for 1000 hours under the condition of coating salt (sodium chloride and coal ash) at 650 ℃.
Example two:
the utility model discloses a rubbish/living beings boiler water wall anticorrosion coating structure is formed to the method that adopts:
(1) the quartz sand with edges and moderate granularity is used for carrying out jet cleaning on the surface of a water-cooled wall corrosion sensitive area, the cleanliness of the metal surface after jet cleaning reaches grade Sa3, and the surface roughness is 30-50 mu m.
(2) And (3) carrying out thermal spraying on the nickel-coated aluminum composite material on the surface of the water cooled wall qualified by spray cleaning inspection, controlling the thickness of a spraying layer to be 0.05-0.1 mm, and inspecting whether the coating has defects or not.
(3) Spraying 622 alloy wire on the surface of the nickel-clad aluminum coating layer qualified by the inspection by using electric arc, controlling the spraying thickness to be 0.4-0.6 mm, and inspecting whether the coating layer has defects.
(4) And (3) cold spraying the anti-contamination ceramic coating on the 622 coating surface which is qualified by inspection, wherein the thickness of the ceramic coating is controlled to be 0.05-0.15 mm, and the 622 alloy coating surface is completely covered. The thermal conductivity coefficient of the anti-contamination ceramic coating is 10-20W/mK. Obtain the utility model discloses a rubbish/living beings boiler water wall anticorrosion coating structure.
(5) And (3) performing corrosion resistance test on the water-cooled wall anticorrosive coating structure of the garbage/biomass boiler, wherein the obvious corrosion does not appear on the surface of the coating for 1000 hours under the condition of coating salt (sodium chloride and coal ash) at 650 ℃.
Example three:
the utility model discloses a rubbish/living beings boiler water wall anticorrosion coating structure is formed to the method that adopts:
(1) the quartz sand with edges and moderate granularity is used for carrying out jet cleaning on the surface of a water-cooled wall corrosion sensitive area, the cleanliness of the metal surface after jet cleaning reaches grade Sa3, and the surface roughness is 35-60 mu m.
(2) And (3) carrying out thermal spraying on the nickel-coated aluminum composite material on the surface of the water cooled wall qualified by spray cleaning inspection, controlling the thickness of a spraying layer to be 0.1-0.15 mm, and inspecting whether the coating has defects or not.
(3) And spraying 625 alloy wire materials on the surface of the nickel-clad aluminum coating layer qualified by inspection by using an electric arc, controlling the spraying thickness to be 0.5-0.8 mm, and inspecting whether the coating layer has defects.
(4) And cold spraying the anti-contamination ceramic coating on the surface of the alloy 625 coating qualified in inspection, wherein the thickness of the ceramic coating is controlled to be 0.1-0.2 mm, and the surface of the alloy 625 coating is completely covered. The thermal conductivity coefficient of the anti-contamination ceramic coating is 5-15W/mK. Obtain the utility model discloses a rubbish/living beings boiler water wall anticorrosion coating structure.
(5) And (3) performing corrosion resistance test on the water-cooled wall anticorrosive coating structure of the garbage/biomass boiler, wherein the obvious corrosion does not appear on the surface of the coating for 1000 hours under the condition of coating salt (sodium chloride and coal ash) at 650 ℃.
Claims (5)
1. The anti-corrosion coating structure of the water-cooled wall of the garbage/biomass boiler consists of a base layer, an intermediate layer and a surface layer; the base layer is a nickel-clad aluminum coating, the intermediate layer is a nickel-based alloy coating, and the surface layer is a contamination-resistant ceramic coating.
2. The waste/biomass boiler water wall anticorrosive coating structure according to claim 1, characterized in that: the nickel-based alloy coating is an alloy 625 coating or an alloy 622 coating.
3. The waste/biomass boiler water wall anticorrosive coating structure according to claim 1 or 2, characterized in that: the thickness of the nickel-coated aluminum coating is 0.03-0.15 mm, the thickness of the nickel-based alloy coating is 0.3-0.8 mm, and the thickness of the anti-contamination ceramic coating is 0.05-0.2 mm.
4. The waste/biomass boiler water wall anticorrosive coating structure according to claim 1 or 2, characterized in that: the thermal conductivity coefficient of the anti-contamination ceramic coating is more than 5W/mK.
5. A waste/biomass boiler, characterized in that: the garbage/biomass boiler comprises the water-cooled wall anticorrosive coating structure of the garbage/biomass boiler as defined in any one of claims 1-4.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920986463.8U CN210736866U (en) | 2019-06-27 | 2019-06-27 | Water-cooled wall anticorrosive coating structure of garbage/biomass boiler |
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| CN201920986463.8U CN210736866U (en) | 2019-06-27 | 2019-06-27 | Water-cooled wall anticorrosive coating structure of garbage/biomass boiler |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113446592A (en) * | 2021-05-18 | 2021-09-28 | 深圳优易材料科技有限公司 | Coating with multilayer structure for boiler heating surface |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113446592A (en) * | 2021-05-18 | 2021-09-28 | 深圳优易材料科技有限公司 | Coating with multilayer structure for boiler heating surface |
| CN113446592B (en) * | 2021-05-18 | 2022-05-17 | 深圳优易材料科技有限公司 | Coating with multilayer structure for boiler heating surface |
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