Boiler water wall tube panel with protective layer

Abstract

The utility model relates to the technical field of water-cooled wall tube panels, in particular to a boiler water-cooled wall tube panel with a protective layer, which comprises a tube panel body. The nickel-aluminum alloy bonding layer is compounded on the outer surface of the tube panel body; the aluminum dihydrogen phosphate adhesive layer is compounded on the surface of the nickel-aluminum alloy adhesive layer; the aluminum powder layer is compounded on the aluminum dihydrogen phosphate binder layer; the low-melting-point glass powder layer is compounded on the surface of the aluminum powder layer; the first glass fiber layer is compounded on the surface of the low-melting-point glass powder layer; the first silicon carbide layer is compounded on the surface of the first glass fiber layer; the second glass fiber layer is compounded on the surface of the first silicon carbide layer; and the second silicon carbide layer is compounded on the surface of the second glass fiber layer. After the boiler water-cooled wall tube panel with the protective layer is put into use, the boiler water-cooled wall tube panel can be effectively protected.

Description

Technical Field

[0001] The utility model relates to the technical field of water-cooled wall tube panels, in particular to a boiler water-cooled wall tube panel with a protective layer. Background Art

[0002] At present, some heating surface tube screens of pulverized coal boilers in large power stations, such as the tube screens around the burner nozzles, the tube screens around the soot blower mouths, the flame folding angles and the horizontal flue tube screens, are seriously worn out by fly ash or damaged by high-temperature steam blowing. The thickness of the tube screens can be reduced by 1mm per year. As the thickness of the tube screens continues to decrease, "tube burst" accidents are prone to occur, resulting in unplanned shutdown of the unit, which seriously affects the safety and economy of the unit operation.

[0003] At present, the commonly used solution is to use supersonic arc spraying or surfacing wear-resistant coating, which has a certain protective effect, but due to the limitation of coating thickness and hardness, the protective effect is limited. Although the use of anti-wear tiles or wear-resistant castables has a better protective effect, there are problems such as poor heat exchange and easy falling off. Utility Model Content

[0004] In view of this, the technical problem to be solved by the present invention is to provide a boiler water-cooled wall tube panel with a protective layer. After the boiler water-cooled wall tube panel with a protective layer provided in the present application is put into use, it will play an effective protective role on the boiler water-cooled wall tube panel.

[0005] The present application provides a boiler water-cooled wall tube panel with a protective layer, comprising:

[0006] Tube screen body;

[0007] A nickel-aluminum alloy bonding layer composited on the outer surface of the tube panel body;

[0008] A dihydrogen phosphate adhesive layer composited on the surface of the nickel-aluminum alloy adhesive layer;

[0009] An aluminum powder layer compounded on the aluminum dihydrogen phosphate binder layer;

[0010] A low melting point glass powder layer compounded on the surface of the aluminum powder layer;

[0011] A first glass fiber layer compounded on the surface of the low-melting-point glass powder layer;

[0012] A first silicon carbide layer composited on the surface of the first glass fiber layer;

[0013] A second glass fiber layer composited on the surface of the first silicon carbide layer;

[0014] A second silicon carbide layer is compounded on the surface of the second glass fiber layer.

[0015] Preferably, the nickel-aluminum alloy bonding layer is Ni 95 Al 5 layer; the thickness of the nickel-aluminum alloy bonding layer is 0.05 to 0.15 mm.

[0016] Preferably, the thickness of the aluminum dihydrogen phosphate binder layer is 1 to 2 mm.

[0017] Preferably, the particle size of the aluminum powder in the aluminum powder layer is -200 mesh; and the thickness of the aluminum powder layer is 1 to 3 mm.

[0018] Preferably, the particle size of the low-melting-point glass powder in the low-melting-point glass powder layer is -325 mesh; and the thickness of the low-melting-point glass powder layer is 1 to 3 mm.

[0019] Preferably, the length of the glass fibers in the first glass fiber layer is 100-350 μm; and the thickness of the first glass fiber layer is 1-2 mm.

[0020] Preferably, the particle size of the silicon carbide powder in the first silicon carbide layer is 80-325 mesh; and the thickness of the first silicon carbide layer is 1-3 mm.

[0021] Preferably, the length of the glass fibers in the second glass fiber layer is 100-350 μm; and the thickness of the second glass fiber layer is 1-2 mm.

[0022] Preferably, the particle size of the silicon carbide powder in the second silicon carbide layer is 80-325 mesh; and the thickness of the second silicon carbide layer is 2-5 mm.

[0023] The present application provides a boiler water-cooled wall tube panel with a protective layer, comprising: a tube panel body; a nickel-aluminum alloy bonding layer composited on the outer surface of the tube panel body; a dihydrogen phosphate adhesive layer composited on the surface of the nickel-aluminum alloy bonding layer; an aluminum powder layer composited on the dihydrogen phosphate adhesive layer; a low-melting point glass powder layer composited on the surface of the aluminum powder layer; a first glass fiber layer composited on the surface of the low-melting point glass powder layer; a first silicon carbide layer composited on the surface of the first glass fiber layer; a second glass fiber layer composited on the surface of the first silicon carbide layer; and a second silicon carbide layer composited on the surface of the second glass fiber layer. In the present application, the boiler water-cooled wall tube panel with a protective layer is put into use. After the boiler is started, as the smoke temperature and water temperature increase, the aluminum powder begins to partially melt. The aluminum powder and the nickel-aluminum alloy bonding layer have similar crystal structures, and the two have good wettability, so they have high bonding strength. As the temperature continues to rise, the low-melting-point glass powder gradually softens and melts, and has good fluidity and high viscosity. It acts as a binder to organically bond the nickel-aluminum alloy bonding layer, aluminum powder layer, glass fiber layer and silicon carbide layer, forming a hard and dense composite protective layer mainly composed of silicon carbide, which will effectively protect the boiler water-cooled wall tube screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic structural diagram of a boiler water-cooled wall tube panel with a protective layer provided for one embodiment of the utility model. DETAILED DESCRIPTION

[0025] The following will be combined with the embodiments of the utility model to clearly and completely describe the technical solution of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] The present application provides a boiler water-cooled wall tube panel with a protective layer, comprising:

[0027] Tube screen body;

[0028] A nickel-aluminum alloy bonding layer composited on the outer surface of the tube panel body;

[0029] A dihydrogen phosphate adhesive layer composited on the surface of the nickel-aluminum alloy adhesive layer;

[0030] An aluminum powder layer compounded on the aluminum dihydrogen phosphate binder layer;

[0031] A low melting point glass powder layer compounded on the surface of the aluminum powder layer;

[0032] A first glass fiber layer compounded on the surface of the low-melting-point glass powder layer;

[0033] A first silicon carbide layer composited on the surface of the first glass fiber layer;

[0034] A second glass fiber layer composited on the surface of the first silicon carbide layer;

[0035] A second silicon carbide layer is compounded on the surface of the second glass fiber layer.

[0036] Figure 1 A schematic diagram of the structure of a boiler water-cooled wall tube panel with a protective layer provided in one embodiment of the utility model. 1 is the tube panel body, 2 is the nickel-aluminum alloy bonding layer, 3 is the aluminum dihydrogen phosphate bonding agent layer, 4 is the aluminum powder layer, 5 is the low-melting-point glass powder layer, 6 is the first glass fiber layer, 7 is the first silicon carbide layer, 8 is the second glass fiber layer, and 9 is the second silicon carbide layer.

[0037] The tube panel includes a tube panel around a burner nozzle, a tube panel around a soot blower port, a flame fold angle or a horizontal flue tube panel.

[0038] In some embodiments of the present application, the nickel-aluminum alloy bonding layer is Ni95 Al 5 The thickness of the nickel-aluminum alloy bonding layer is 0.05 to 0.15 mm, such as 0.1 mm or 0.15 mm.

[0039] In some embodiments of the present application, the thickness of the aluminum dihydrogen phosphate adhesive layer is 1 to 2 mm, such as 1.5 mm or 2 mm.

[0040] In some embodiments of the present application, the particle size of the aluminum powder in the aluminum powder layer is -200 mesh; the thickness of the aluminum powder layer is 1 to 3 mm, such as 2 mm or 3 mm.

[0041] In some embodiments of the present application, the melting temperature of the low-melting glass powder layer ranges from 500 to 850° C., such as 550 to 850° C. The particle size of the low-melting glass powder in the low-melting glass powder layer is -325 mesh; the thickness of the low-melting glass powder layer is 1 to 3 mm, such as 2 mm or 3 mm.

[0042] In some embodiments of the present application, the length of the glass fibers in the first glass fiber layer is 100-350 μm; the thickness of the first glass fiber layer is 1-2 mm, such as 1.5 mm or 2 mm.

[0043] In some embodiments of the present application, the particle size of the silicon carbide powder in the first silicon carbide layer is 80-325 mesh; the thickness of the first silicon carbide layer is 1-3 mm, such as 2 mm, 3 mm.

[0044] In some embodiments of the present application, the length of the glass fibers in the second glass fiber layer is 100-350 μm; the thickness of the second glass fiber layer is 1-2 mm, such as 1.5 mm or 2 mm.

[0045] In some embodiments of the present application, the particle size of the silicon carbide powder in the second silicon carbide layer is 80-325 mesh; the thickness of the second silicon carbide layer is 2-5 mm, such as 5 mm or 4 mm.

[0046] In some embodiments of the present application, the method for preparing the boiler water-cooled wall tube panel with a protective layer comprises the following steps:

[0047] A) After the surface of the boiler water-cooled wall tube panel is sandblasted, a nickel-aluminum alloy bonding layer is sprayed by supersonic arc spraying;

[0048] B) after applying aluminum dihydrogen phosphate binder on the nickel aluminum alloy bonding layer, paving aluminum powder and compacting, after the aluminum dihydrogen phosphate binder is cured at room temperature, obtaining an aluminum dihydrogen phosphate binder layer and an aluminum powder layer;

[0049] C) spreading low-melting-point glass powder on the aluminum powder layer and compacting it to obtain a low-melting-point glass powder layer;

[0050] D) laying a first glass fiber on the low-melting-point glass powder layer and compacting it to obtain a first glass fiber layer;

[0051] E) spreading first silicon carbide powder on the first glass fiber layer and compacting it to obtain a first silicon carbide layer;

[0052] F) laying a second glass fiber on the first silicon carbide layer and compacting it to obtain a second glass fiber layer;

[0053] G) spreading second silicon carbide powder on the second glass fiber layer and compacting it to obtain a second silicon carbide layer.

[0054] In step A), after sandblasting, the surface roughness of the water-cooled wall tube panel reaches Sa2.5 level.

[0055] In step B), after the aluminum dihydrogen phosphate adhesive is cured at room temperature, the aluminum powder layer and the nickel aluminum alloy adhesive layer are firmly bonded together.

[0056] In step D), the glass powder is a low-melting-point glass powder; and the glass powder layer is a low-melting-point glass powder layer.

[0057] In the present application, the boiler water-cooled wall tube screen with the protective layer is put into use. After the boiler is started, as the smoke temperature and water temperature increase, the aluminum powder begins to partially melt. The aluminum powder and the nickel-aluminum alloy bonding layer have similar crystal structures, and the two have good wettability, so they have high bonding strength. As the temperature rises further, the low-melting-point glass powder gradually softens and melts, has good fluidity and high viscosity, and acts as a binder to organically bond the nickel-aluminum alloy bonding layer, the aluminum powder layer, the glass fiber layer, and the silicon carbide layer, forming a hard and dense composite protective layer mainly composed of silicon carbide, thereby effectively protecting the boiler water-cooled wall tube screen.

[0058] In order to further illustrate the utility model, a boiler water-cooled wall tube panel with a protective layer provided by the present application is described in detail below in combination with an embodiment, but it should not be understood as limiting the protection scope of the present application.

[0059] Example 1

[0060] The boiler water-cooled wall tube panel with protective layer includes:

[0061] Tube screen body;

[0062] A nickel-aluminum alloy bonding layer composited on the outer surface of the tube panel body;

[0063] A dihydrogen phosphate adhesive layer composited on the surface of the nickel-aluminum alloy adhesive layer;

[0064] An aluminum powder layer compounded on the aluminum dihydrogen phosphate binder layer;

[0065] A low melting point glass powder layer compounded on the surface of the aluminum powder layer;

[0066] A first glass fiber layer compounded on the surface of the low-melting-point glass powder layer;

[0067] A first silicon carbide layer composited on the surface of the first glass fiber layer;

[0068] A second glass fiber layer composited on the surface of the first silicon carbide layer;

[0069] a second silicon carbide layer compounded on the surface of the second glass fiber layer;

[0070] The nickel-aluminum alloy bonding layer is Ni 95 Al 5 layer, thickness is 0.1mm;

[0071] The thickness of the aluminum dihydrogen phosphate adhesive layer is 1.5 mm;

[0072] The thickness of the aluminum powder layer is 2 mm;

[0073] The melting temperature range of the low-melting-point glass powder layer is 550-850° C.; the particle size of the low-melting-point glass powder in the low-melting-point glass powder layer is -325 mesh; the thickness of the low-melting-point glass powder layer is 2 mm;

[0074] The length of the glass fibers (first glass fibers) in the first glass fiber layer is 100 to 350 μm; the thickness of the first glass fiber layer is 1.5 mm;

[0075] The particle size of the silicon carbide powder (first silicon carbide powder) in the first silicon carbide layer is 80-325 mesh; the thickness of the first silicon carbide layer is 2 mm;

[0076] The length of the glass fibers (second glass fibers) in the second glass fiber layer is 100 to 350 μm; the thickness of the second glass fiber layer is 1.5 mm;

[0077] The particle size of the silicon carbide powder (second silicon carbide powder) in the second silicon carbide layer is 80-325 meshes; the thickness of the second silicon carbide layer is 5 mm.

[0078] Preparation of the boiler water-cooled wall tube panel with a protective layer:

[0079] 1) The boiler water-cooled wall tube panel is sandblasted to a surface roughness of Sa2.5, and Ni is sprayed on the surface of the water-cooled wall tube panel using supersonic arc spraying technology. 95 Al 5 layer;

[0080] 2) In the Ni 95 Al 5 After the aluminum dihydrogen phosphate binder is applied on the layer, aluminum powder is spread on it and compacted. After the aluminum dihydrogen phosphate binder is cured at room temperature, an aluminum dihydrogen phosphate binder layer and an aluminum powder layer are obtained; low-melting point glass powder is spread on the aluminum powder layer and compacted to obtain a low-melting point glass powder layer; the first glass fiber is spread on the low-melting point glass powder layer and compacted to obtain a first glass fiber layer; the first silicon carbide powder is spread on the first glass fiber layer and compacted to obtain a first silicon carbide layer; the second glass fiber is spread on the first silicon carbide layer and compacted to obtain a second glass fiber layer; the second silicon carbide powder is spread on the second glass fiber layer and compacted to obtain a second silicon carbide layer; thereby a boiler water-cooled wall tube panel with a protective layer is obtained.

[0081] After the boiler is started, as the smoke temperature and water temperature increase (gradually rising from room temperature to 1000°C in 12 hours), the aluminum powder and low-melting-point glass powder melt and organically bond the nickel-aluminum alloy bonding layer, glass fiber layer and silicon carbide layer to form a hard and dense composite protective layer mainly composed of silicon carbide.

[0082] Example 2

[0083] The boiler water-cooled wall tube panel with protective layer includes:

[0084] Tube screen body;

[0085] A nickel-aluminum alloy bonding layer composited on the outer surface of the tube panel body;

[0086] A dihydrogen phosphate adhesive layer composited on the surface of the nickel-aluminum alloy adhesive layer;

[0087] An aluminum powder layer compounded on the aluminum dihydrogen phosphate binder layer;

[0088] A low melting point glass powder layer compounded on the surface of the aluminum powder layer;

[0089] A first glass fiber layer compounded on the surface of the low-melting-point glass powder layer;

[0090] A first silicon carbide layer composited on the surface of the first glass fiber layer;

[0091] A second glass fiber layer composited on the surface of the first silicon carbide layer;

[0092] a second silicon carbide layer compounded on the surface of the second glass fiber layer;

[0093] The nickel-aluminum alloy bonding layer is Ni 95 Al 5 layer, thickness is 0.15mm;

[0094] The thickness of the aluminum dihydrogen phosphate adhesive layer is 2 mm;

[0095] The thickness of the aluminum powder layer is 3 mm;

[0096] The melting temperature range of the low-melting-point glass powder layer is 550-850° C.; the particle size of the low-melting-point glass powder in the low-melting-point glass powder layer is -325 mesh; the thickness of the low-melting-point glass powder layer is 3 mm;

[0097] The length of the glass fibers (first glass fibers) in the first glass fiber layer is 100 to 350 μm; the thickness of the first glass fiber layer is 2 mm;

[0098] The particle size of the silicon carbide powder (first silicon carbide powder) in the first silicon carbide layer is 80-325 mesh; the thickness of the first silicon carbide layer is 3 mm;

[0099] The length of the glass fibers (second glass fibers) in the second glass fiber layer is 100 to 350 μm; the thickness of the second glass fiber layer is 2 mm;

[0100] The particle size of the silicon carbide powder (second silicon carbide powder) in the second silicon carbide layer is 80-325 meshes; and the thickness of the second silicon carbide layer is 4 mm.

[0101] Preparation of the boiler water-cooled wall tube panel with a protective layer:

[0102] 1) The water-cooled wall tube panel is sandblasted to a surface roughness of Sa2.5, and Ni is sprayed on the surface of the water-cooled wall tube panel using supersonic arc spraying technology. 95 Al 5 layer;

[0103] 2) In the Ni 95 Al 5 After the aluminum dihydrogen phosphate binder is applied on the layer, aluminum powder is spread on it and compacted. After the aluminum dihydrogen phosphate binder is cured at room temperature, an aluminum dihydrogen phosphate binder layer and an aluminum powder layer are obtained; low-melting point glass powder is spread on the aluminum powder layer and compacted to obtain a low-melting point glass powder layer; the first glass fiber is spread on the low-melting point glass powder layer and compacted to obtain a first glass fiber layer; the first silicon carbide powder is spread on the first glass fiber layer and compacted to obtain a first silicon carbide layer; the second glass fiber is spread on the first silicon carbide layer and compacted to obtain a second glass fiber layer; the second silicon carbide powder is spread on the second glass fiber layer and compacted to obtain a second silicon carbide layer; thereby a boiler water-cooled wall tube panel with a protective layer is obtained.

[0104] After the boiler is started, as the smoke temperature and water temperature increase (gradually rising from room temperature to 1000°C in 12 hours), the aluminum powder and low-melting-point glass powder melt and organically bond the nickel-aluminum alloy bonding layer, glass fiber layer and silicon carbide layer to form a hard and dense composite protective layer mainly composed of silicon carbide.

[0105] The performance of the hard and dense composite protective layer obtained in Examples 1 to 2 was tested, and the results are shown in Table 1.

[0106] Table 1 Performance test results of the hard and dense composite protective layer obtained in Examples 1 to 2

[0107] parameter Example 1 Example 2 Test Standards Apparent porosity 1.2％ 1.8％ GB / T25995-2010 Vickers hardness 1315 1432 GB / T16534-1996

[0108] As can be seen from Table 1, after the boiler water-cooled wall tube panel with a protective layer provided by the present application is put into use, the obtained hard and dense composite protective layer has a low porosity and dense characteristic, which can effectively prevent the penetration of corrosive gases in flue gas and corrosive media in ash; at the same time, the protective layer has extremely high hardness, which can effectively prevent the erosion and wear of fly ash in high-speed flue gas and the blow damage of high-temperature and high-pressure steam. Thus, it plays an effective protective role on the boiler water-cooled wall tube panel.

[0109] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A boiler water-cooled wall tube panel with a protective layer, characterized in that: include: Tube screen body; A nickel-aluminum alloy bonding layer composited on the outer surface of the tube panel body; A dihydrogen phosphate adhesive layer composited on the surface of the nickel-aluminum alloy adhesive layer; An aluminum powder layer compounded on the aluminum dihydrogen phosphate binder layer; A low melting point glass powder layer compounded on the surface of the aluminum powder layer; A first glass fiber layer compounded on the surface of the low-melting-point glass powder layer; A first silicon carbide layer composited on the surface of the first glass fiber layer; A second glass fiber layer composited on the surface of the first silicon carbide layer; A second silicon carbide layer is compounded on the surface of the second glass fiber layer.

2. The boiler water-cooled wall tube panel according to claim 1, characterized in that: The nickel-aluminum alloy bonding layer is Ni 95 Al5 layer.

3. The boiler water-cooled wall tube panel according to claim 1, characterized in that: The thickness of the nickel-aluminum alloy bonding layer is 0.05-0.15 mm.

4. The boiler water-cooled wall tube panel according to claim 1, characterized in that: The thickness of the aluminum dihydrogen phosphate adhesive layer is 1 to 2 mm.

5. The boiler water-cooled wall tube panel according to claim 1, characterized in that: The particle size of the aluminum powder in the aluminum powder layer is -200 mesh; the thickness of the aluminum powder layer is 1 to 3 mm.

6. The boiler water-cooled wall tube panel according to claim 1, characterized in that: The particle size of the low-melting-point glass powder in the low-melting-point glass powder layer is -325 mesh; the thickness of the low-melting-point glass powder layer is 1 to 3 mm.

7. The boiler water-cooled wall tube panel according to claim 1, characterized in that: The length of the glass fibers in the first glass fiber layer is 100-350 μm; the thickness of the first glass fiber layer is 1-2 mm.

8. The boiler water-cooled wall tube panel according to claim 1, characterized in that: The particle size of the silicon carbide powder in the first silicon carbide layer is 80-325 meshes; the thickness of the first silicon carbide layer is 1-3 mm.

9. The boiler water-cooled wall tube panel according to claim 1, characterized in that: The length of the glass fibers in the second glass fiber layer is 100-350 μm; the thickness of the second glass fiber layer is 1-2 mm.

10. The boiler water-cooled wall tube panel according to claim 1, characterized in that: The particle size of the silicon carbide powder in the second silicon carbide layer is 80-325 meshes; the thickness of the second silicon carbide layer is 2-5 mm.

Images