CN210179596U - Anticorrosive wear-resisting membrane wall structure - Google Patents
Anticorrosive wear-resisting membrane wall structure Download PDFInfo
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- CN210179596U CN210179596U CN201920399217.2U CN201920399217U CN210179596U CN 210179596 U CN210179596 U CN 210179596U CN 201920399217 U CN201920399217 U CN 201920399217U CN 210179596 U CN210179596 U CN 210179596U
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Abstract
The utility model relates to an anticorrosive wear-resistant membrane type water-cooled wall structure, a membrane type water-cooled wall body is formed by welding a plurality of water-cooled wall tubes and fins in a row, and a weldable metal coating, an anticorrosive wear-resistant metal coating and an inorganic hole sealing agent coating are sequentially coated on the outer surface of the fire facing side of the membrane type water-cooled wall body from inside to outside; the outer surface of the fire facing side of the water wall tube is spot welded with a plurality of welding spots which enable the weldable metal coating to be tightly combined on the outer surfaces of the fire facing sides of the water wall tube and the fins and enable the anti-corrosion wear-resistant metal coating to be tightly combined on the outer surface of the weldable metal coating. The utility model discloses increase substantially the anticorrosive wear resistance of coating, effectively reduce the high temperature corrosion and the wearing and tearing attenuate of boiler water wall pipe, reduce the unplanned shutdown of unit, improve boiler system's life.
Description
Technical Field
The utility model relates to an explosion-proof technical field of boiler four-tube abrasionproof, concretely relates to anticorrosive wear-resisting membrane type water-cooled wall structure.
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, 37.31% 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.
In view of this, chinese patent application No. 2018111504081: the application relates to a membrane water-cooled wall with an anti-abrasion heating surface and a preparation method thereof, wherein an anti-corrosion layer is coated on the heating surface of a fin tube and comprises an interlayer and an anti-abrasion tile, the interlayer is coated on the heating surface of the fin tube, the anti-abrasion tile is coated on the outer surface of the interlayer through an anti-abrasion tile clamping ring, although a certain anti-corrosion effect can be achieved, the heat exchange effect, the interlayer and the anti-abrasion tile are poor in firmness of coating the heating surface of the fin tube.
Therefore, there is a need for improvements and optimizations to existing membrane water wall structures.
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 structural design is reasonable, stand wear and tear and high temperature corrosion's membrane wall structure 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 membrane wall structure, includes the membrane wall body, the membrane wall body is pieced together by a plurality of water wall pipe and fin and is arranged the welding and form its characterized in that: the outer surface of the fire facing side of the membrane type water-cooled wall body is sequentially coated with a weldable metal coating, an anti-corrosion wear-resistant metal coating and an inorganic hole sealing agent coating from inside to outside; the outer surface of the fire facing side of the water wall tube is spot welded with a plurality of welding spots which enable the weldable metal coating to be tightly combined on the outer surfaces of the fire facing sides of the water wall tube and the fins and enable the anti-corrosion wear-resistant metal coating to be tightly combined on the outer surface of the weldable metal coating.
Preferably, the water wall tube 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.
Preferably, the water wall tube and the fins are made of the same material and are made of 12Cr1MoV heat-resistant steel.
Preferably, the thickness of the fin is 5-15mm, and the width of the fin is 20-50 mm.
Preferably, the welding spot is formed by spot welding of a stainless steel welding rod and penetrates through the water wall tube; 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 thickness of the weldable metal coating is 0.3-0.5mm, and the weldable metal coating is made of an anti-corrosion wear-resistant NiCrTi coating material.
Preferably, the thickness of the corrosion-resistant and wear-resistant metal coating is 2.0-3.0mm, and the material is a corrosion-resistant and 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 metal coating is at the same height as the top surface of the welding spot.
Compared with the prior art, the utility model, have following advantage and effect:
1. the welding spot is arranged on the outer surface of the fire facing side of the water wall tube, so that the weldable metal coating, the water wall tube and the fins are tightly combined without defects, a good base surface is provided for the anti-corrosion wear-resistant metal coating, meanwhile, the welding spot further improves the combination state of the anti-corrosion wear-resistant metal coating and the water wall tube, and the thermal shock resistance of the coating is improved;
2. the thickness of the anti-corrosion wear-resistant metal coating is effectively increased by the welding spot, the anti-corrosion performance and the wear resistance of the coating are improved, and the heat conduction performance of the coating is effectively improved by the application of the metal coating;
3. 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;
4. the corrosion resistance and the wear resistance of the coating are greatly improved, the high-temperature corrosion and the wear and tear 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.
Drawings
In order to illustrate the embodiments of the present invention more clearly, the drawings that are needed in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the description below are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained without inventive work.
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Description of reference numerals: the water cooling wall comprises a water cooling wall tube 1, fins 2, a weldable metal coating 3, welding spots 4, an anticorrosive wear-resistant metal coating 5 and an inorganic hole sealing agent coating 6.
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 membrane water wall structure, which includes a membrane water wall body formed by welding a plurality of water wall tubes 1 and fins 2 in a row. The outer surface of the fire facing side of the membrane type water-cooled wall body is sequentially coated with a weldable metal coating 3, an anticorrosive wear-resistant metal coating 5 and an inorganic hole sealing agent coating 6 from inside to outside.
In order to make the weldable metal coating 3 tightly bonded to the outer surfaces of the water wall tube 1 and the fins 2 on the fire side and to make the anticorrosive wear-resistant metal coating 5 tightly bonded to the outer surfaces of the weldable metal coating 3, a plurality of welding spots 4 are spot-welded to the outer surface of the water wall tube 1 on the fire side. The welding spot 4 is formed by spot welding with a stainless steel welding rod and penetrates through the water wall tube 1; the distance between two adjacent welding spots 4 is 55 mm; the height of the solder joint 4 is 2.5 mm.
The water wall tube 1 is a circular steel tube with internal threads, the wall thickness of the tube is 10mm, and the outer diameter of the tube is 50 mm. The water wall tube 1 and the fins 2 are made of the same material, and are made of 12Cr1MoV heat-resistant steel. The thickness of the fin 2 is 10mm, the width is 30mm, namely the distance a between two adjacent water wall tubes 1 is 30 mm.
The thickness of the weldable metal coating 3 is 0.4mm, and the weldable metal coating is made of an anti-corrosion wear-resistant NiCrTi coating material. The thickness of the anti-corrosion and wear-resistant metal coating 5 is 2.1mm, the material of the anti-corrosion and wear-resistant metal coating is NiCrTi coating material, and the outer surface of the anti-corrosion and wear-resistant metal coating 5 and the top surface of the welding spot 4 are at the same height. The thickness of the inorganic hole sealing agent coating 6 is 0.1mm, and the inorganic hole sealing agent coating 6 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.
The anti-corrosion wear-resistant film type water-cooled wall structure can greatly improve the anti-corrosion wear-resistant performance of the coating, effectively reduce the high-temperature corrosion and wear thinning of the boiler water-cooled wall pipe, particularly reflect the economical efficiency of the technology near a burner with relatively serious high-temperature corrosion and wear, reduce the unplanned shutdown of a unit, and improve the service life of a boiler system.
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 patent idea of the utility model are included in the protection scope of the patent 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 membrane wall structure, includes the membrane wall body, the membrane wall body is pieced together row welding by a plurality of water wall pipe (1) and fin (2) and is formed its characterized in that: the outer surface of the fire facing side of the membrane type water-cooled wall body is sequentially coated with a weldable metal coating (3), an anticorrosive wear-resistant metal coating (5) and an inorganic hole sealing agent coating (6) from inside to outside; the outer surface of the fire facing side of the water cooling wall pipe (1) is spot welded with a plurality of welding spots (4) which enable the weldable metal coating (3) to be tightly combined on the outer surfaces of the fire facing side of the water cooling wall pipe (1) and the fins (2) and enable the anti-corrosion wear-resistant metal coating (5) to be tightly combined on the outer surface of the weldable metal coating (3).
2. The corrosion and wear resistant membrane water wall structure of claim 1, wherein: the water wall tube (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.
3. The corrosion and wear resistant membrane water wall structure of claim 1, wherein: the water wall tube (1) and the fins (2) are made of the same material and are made of 12Cr1MoV heat-resistant steel.
4. The corrosion and wear resistant membrane water wall structure of claim 1, wherein: the thickness of the fin (2) is 5-15mm, and the width is 20-50 mm.
5. The corrosion and wear resistant membrane water wall structure of claim 1, wherein: the welding spot (4) is formed by spot welding of a stainless steel welding rod and penetrates through the water wall tube (1); the distance between two adjacent welding points (4) is 50-60 mm.
6. An anti-corrosion wear-resistant membrane water wall structure according to claim 1 or 5, wherein: the height of the welding spot (4) is 2.0-3.0 mm.
7. The corrosion and wear resistant membrane water wall structure of claim 1, wherein: the thickness of the weldable metal coating (3) is 0.3-0.5mm, and the weldable metal coating is made of an anti-corrosion wear-resistant NiCrTi coating material.
8. The corrosion and wear resistant membrane water wall structure of claim 1, wherein: the thickness of the corrosion-resistant and wear-resistant metal coating (5) is 2.0-3.0mm, and the material is a corrosion-resistant and wear-resistant NiCrTi coating material.
9. The corrosion and wear resistant membrane water wall structure of claim 1, wherein: the thickness of the inorganic hole sealing agent coating (6) is 0.05-0.15 mm.
10. The corrosion and wear resistant membrane water wall structure of claim 1, wherein: the outer surface of the anti-corrosion wear-resistant metal coating (5) and the top surface of the welding spot (4) are at the same height.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920399217.2U CN210179596U (en) | 2019-03-27 | 2019-03-27 | Anticorrosive wear-resisting membrane wall structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920399217.2U CN210179596U (en) | 2019-03-27 | 2019-03-27 | Anticorrosive wear-resisting membrane wall structure |
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| CN210179596U true CN210179596U (en) | 2020-03-24 |
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| CN201920399217.2U Active CN210179596U (en) | 2019-03-27 | 2019-03-27 | Anticorrosive wear-resisting membrane wall structure |
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