CN210179672U - Anticorrosive wear-resisting water wall pipe - Google Patents
Anticorrosive wear-resisting water wall pipe Download PDFInfo
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- CN210179672U CN210179672U CN201920399212.XU CN201920399212U CN210179672U CN 210179672 U CN210179672 U CN 210179672U CN 201920399212 U CN201920399212 U CN 201920399212U CN 210179672 U CN210179672 U CN 210179672U
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Abstract
The utility model relates to an anticorrosive wear-resisting water wall tube scribbles metal coating, anticorrosive wear-resisting coating and inorganic hole sealing agent coating from inside to outside in proper order on the surface of water wall tube body. The outer surface of the water wall tube body is spot welded with welding spots which enable the metal coating to be tightly combined on the outer surface of the water wall tube body and enable the anti-corrosion wear-resistant coating to be tightly combined on the outer surface of the metal coating. On the premise of not influencing the metallic metallographic structure of the water wall tube body, a method combining thermal spraying and spot welding is adopted to form a compact continuous metal coating on the outer surface of the water wall tube body, the metal coating is tightly combined with the water wall tube body without defects, a good base surface is provided for the anti-corrosion wear-resistant coating, meanwhile, the welding spot further improves the combination state of the anti-corrosion wear-resistant coating and the water wall tube body, and the thermal shock resistance of the coating is improved; the high-temperature corrosion and the abrasion thinning of the boiler water wall pipe are effectively reduced, the unplanned shutdown of a unit is reduced, and the service life of a boiler system is prolonged.
Description
Technical Field
The utility model relates to an explosion-proof technical field of boiler four-tube abrasionproof, concretely relates to anticorrosive wear-resisting water wall pipe.
Background
In recent years, with the implementation of new environmental standards, thermal power plants have entered the peak of low-nitrogen burner modification in order to effectively reduce the emission concentration of Nox in flue gas. The low-nitrogen combustor modification can cause the strengthening of the reducing atmosphere of the water-cooled wall area near the combustor, so that the high-temperature corrosion of the water-cooled wall is aggravated. Meanwhile, as the thermal power plant is involved in deep peak regulation, the load of the unit changes frequently, the combustion is unstable easily, reducing atmosphere is generated, smoke rushes to the wall, and then high-temperature corrosion of the water wall and fly ash abrasion occur. According to statistics, 37.21% is accounted for by water wall explosion and leakage in the unplanned shutdown of a thermal generator set in 2018 of a certain group company, wherein high-temperature corrosion and wear and tear thinning are the main reasons for failure of the water wall. Therefore, there is a need for improvements and optimizations to existing waterwall tube configurations.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the above-mentioned not enough that exists among the prior art, and provide a water-cooling wall tube structure that structural design is reasonable, stand wear and tear and high temperature corrosion to guarantee boiler safety, stable, economic operation, improve boiler system's life, reduce the unplanned shutdown of unit.
The utility model provides a technical scheme that above-mentioned problem adopted is: the utility model provides an anticorrosive wear-resisting water wall tube, includes water wall tube body, its characterized in that: the outer surface of the water wall tube body is coated with a metal coating, an anticorrosion wear-resistant coating and an inorganic hole sealing agent coating from inside to outside in sequence.
Preferably, the outer surface of the water wall tube body is spot welded with welding spots which enable the metal coating to be tightly combined on the outer surface of the water wall tube body and enable the anti-corrosion wear-resistant coating to be tightly combined on the outer surface of the metal coating.
Preferably, the welding spot is formed by spot welding of a stainless steel welding rod and penetrates through the water wall tube body; the distance between two adjacent welding points is 50-60 mm.
Preferably, the height of the welding spot is 2.0-3.0 mm.
Preferably, the water wall tube body is a round steel tube with internal threads, the tube wall thickness of the round steel tube is 5-15mm, and the outer diameter of the round steel tube is 20-80 mm.
Preferably, the thickness of the metal coating is 0.3-0.5mm, and the material of the metal coating is an anti-corrosion wear-resistant NiCrTi coating material.
Preferably, the thickness of the anti-corrosion wear-resistant coating is 2.0-3.0mm, and the material is an anti-corrosion wear-resistant NiCrTi coating material
Preferably, the thickness of the inorganic hole sealing agent coating is 0.05-0.15 mm.
Preferably, the outer surface of the anti-corrosion wear-resistant coating is at the same height as the top surface of the welding spot.
Preferably, the water wall tube body is made of 12Cr1MoV heat-resistant steel.
Compared with the prior art, the utility model, have following advantage and effect:
1. on the premise of not influencing the metallic metallographic structure of the water wall tube body, a method combining thermal spraying and spot welding is adopted to form a compact continuous metal coating on the outer surface of the water wall tube body, the metal coating is tightly combined with the water wall tube body without defects, a good base surface is provided for the anti-corrosion wear-resistant coating, meanwhile, the welding spot further improves the combination state of the anti-corrosion wear-resistant coating and the water wall tube body, and the thermal shock resistance of the coating is improved;
2. the thickness of the anti-corrosion wear-resistant coating is effectively increased by the welding spots, and the anti-corrosion performance and the wear resistance of the coating are improved; the application of the metal coating effectively improves the heat conduction performance of the coating; the inorganic hole sealing agent coating is subjected to hole sealing treatment, so that a coating with a continuous, compact and smooth surface and without defects such as air holes, cracks and the like can be obtained;
3. the corrosion resistance and the wear resistance of the coating can be greatly improved, the high-temperature corrosion and the wear thinning of the boiler water wall pipe are effectively reduced, particularly, the economical efficiency of the technology can be better embodied near a combustor with serious high-temperature corrosion and wear, the unplanned shutdown of a unit is reduced, and the service life of a boiler system is prolonged.
Drawings
In order to illustrate the embodiments of the present invention or the solutions in the prior art more clearly, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Description of reference numerals: the water wall pipe comprises a water wall pipe body 1, a metal coating 2, welding spots 3, an anti-corrosion wear-resistant coating 4 and an inorganic hole sealing agent coating 5.
Detailed Description
The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not intended to limit the present invention.
Referring to fig. 1, the embodiment is an anticorrosive wear-resistant water wall tube, which comprises a water wall tube body 1, wherein a metal coating 2, an anticorrosive wear-resistant coating 4 and an inorganic hole sealing agent coating 5 are sequentially coated on the outer surface of the water wall tube body 1 from inside to outside. The outer surface of the water wall tube body 1 is spot welded with welding spots 3 which enable the metal coating 2 to be tightly combined on the outer surface of the water wall tube body 1 and enable the anti-corrosion wear-resistant coating 4 to be tightly combined on the outer surface of the metal coating 2. The welding spot 3 is formed by spot welding with a stainless steel welding rod and penetrates through the water wall tube body 1; the distance between two adjacent welding spots 3 is 55mm, and the height of the welding spot 3 is 2.5 mm.
Through setting up solder joint 3, under the prerequisite that does not influence water wall pipe body 1 metallic metallographic structure, adopt the method that hot spraying and spot welding combined together, form the fine and close continuous metal coating 2 of one deck at water wall pipe body 1 surface, metal coating 2 combines with water wall pipe body 1 closely flawless, provides good base surface for anticorrosive wear-resistant coating 4, and solder joint 3 has further improved the joint state of anticorrosive wear-resistant coating 4 with water wall pipe body 1 simultaneously, has improved the thermal shock resistance performance of coating.
In this embodiment, the water wall tube body 1 is a circular steel tube with internal threads, the wall thickness of the tube is 10mm, the outer diameter of the tube is 50mm, and the water wall tube body 1 is made of 12Cr1MoV heat-resistant steel. The metal coating 2 is a weldable metal coating with the thickness of 0.5mm and is made of an anti-corrosion wear-resistant NiCrTi coating material. The thickness of the anti-corrosion wear-resistant coating 4 is 2.0mm, and the material is an anti-corrosion wear-resistant NiCrTi coating material. The outer surface of the anti-corrosion wear-resistant coating 4 and the top surface of the welding spot are at the same height. The thickness of the inorganic hole sealing agent coating 5 is 0.1mm, and the inorganic hole sealing agent coating 5 is used for hole sealing treatment, so that a coating with a continuous, compact and smooth surface and without defects such as air holes, cracks and the like can be obtained.
In this embodiment, the anticorrosive wear resistance of coating improves by a wide margin, effectively reduces the high temperature corrosion and the wearing and tearing attenuate of boiler water wall pipe, especially can embody the economic nature of this technique near the comparatively serious combustor of high temperature corrosion and wearing and tearing, reduces the unplanned shutdown of unit, improves boiler system's life.
In addition, it should be noted that the specific embodiments described in the present specification may be different in the components, the shapes of the components, the names of the components, and the like, and the above description is only an example of the structure of the present invention. All the equivalent changes or simple changes made according to the structure, characteristics and principle of the utility model are included in the protection scope of the utility model. Various modifications, additions and substitutions may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.
Claims (10)
1. The utility model provides an anticorrosive wear-resisting water wall tube, includes water wall tube body (1), its characterized in that: the outer surface of the water wall tube body (1) is sequentially coated with a metal coating (2), an anticorrosion wear-resistant coating (4) and an inorganic hole sealing agent coating (5) from inside to outside.
2. The corrosion and wear resistant waterwall tube of claim 1, wherein: the outer surface of the water wall tube body (1) is spot welded with a plurality of welding spots (3) which enable the metal coating (2) to be tightly combined on the outer surface of the water wall tube body (1) and enable the anti-corrosion wear-resistant coating (4) to be tightly combined on the outer surface of the metal coating (2).
3. The corrosion and wear resistant waterwall tube of claim 2, wherein: the welding spot (3) is formed by spot welding of a stainless steel welding rod and penetrates through the water wall tube body (1); the distance between two adjacent welding points (3) is 50-60 mm.
4. The corrosion and wear resistant waterwall tube of claim 2, wherein: the height of the welding spot (3) is 2.0-3.0 mm.
5. The corrosion and wear resistant waterwall tube of claim 1, wherein: the water wall tube body (1) is a round steel tube with internal threads, the wall thickness of the tube is 5-15mm, and the outer diameter of the tube is 20-80 mm.
6. The corrosion and wear resistant waterwall tube of claim 1, wherein: the thickness of the metal coating (2) is 0.3-0.5mm, and the material is an anti-corrosion wear-resistant NiCrTi coating material.
7. The corrosion and wear resistant waterwall tube of claim 1, wherein: the thickness of the anti-corrosion wear-resistant coating (4) is 2.0-3.0mm, and the material is an anti-corrosion wear-resistant NiCrTi coating material.
8. The corrosion and wear resistant waterwall tube of claim 1, wherein: the thickness of the inorganic hole sealing agent coating (5) is 0.05-0.15 mm.
9. The corrosion and wear resistant waterwall tube of claim 1, wherein: the outer surface of the anti-corrosion wear-resistant coating (4) and the top surface of the welding spot (3) are at the same height.
10. The corrosion and wear resistant waterwall tube of claim 1 or 5, wherein: the water wall tube body (1) is made of 12Cr1MoV heat-resistant steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920399212.XU CN210179672U (en) | 2019-03-27 | 2019-03-27 | Anticorrosive wear-resisting water wall pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920399212.XU CN210179672U (en) | 2019-03-27 | 2019-03-27 | Anticorrosive wear-resisting water wall pipe |
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| Publication Number | Publication Date |
|---|---|
| CN210179672U true CN210179672U (en) | 2020-03-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920399212.XU Active CN210179672U (en) | 2019-03-27 | 2019-03-27 | Anticorrosive wear-resisting water wall pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210179672U (en) |
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2019
- 2019-03-27 CN CN201920399212.XU patent/CN210179672U/en active Active
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