CN220489129U - Gradient ceramic alloy composite furnace tube - Google Patents
Gradient ceramic alloy composite furnace tube Download PDFInfo
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- CN220489129U CN220489129U CN202320224731.9U CN202320224731U CN220489129U CN 220489129 U CN220489129 U CN 220489129U CN 202320224731 U CN202320224731 U CN 202320224731U CN 220489129 U CN220489129 U CN 220489129U
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- furnace tube
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- 239000002131 composite material Substances 0.000 title claims abstract description 28
- 229910002110 ceramic alloy Inorganic materials 0.000 title claims abstract description 16
- 238000005524 ceramic coating Methods 0.000 claims abstract description 26
- 230000007704 transition Effects 0.000 claims abstract description 16
- 239000011248 coating agent Substances 0.000 claims abstract description 14
- 238000000576 coating method Methods 0.000 claims abstract description 14
- 239000000919 ceramic Substances 0.000 claims abstract description 8
- 238000005498 polishing Methods 0.000 claims abstract description 4
- 238000005488 sandblasting Methods 0.000 claims abstract description 4
- 230000007797 corrosion Effects 0.000 abstract description 8
- 238000005260 corrosion Methods 0.000 abstract description 8
- 238000005299 abrasion Methods 0.000 abstract description 7
- 239000000463 material Substances 0.000 abstract description 4
- 229910000831 Steel Inorganic materials 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 238000004880 explosion Methods 0.000 description 3
- 238000005336 cracking Methods 0.000 description 2
- 230000032798 delamination Effects 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- 230000008646 thermal stress Effects 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 229910000601 superalloy Inorganic materials 0.000 description 1
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- Coating By Spraying Or Casting (AREA)
Abstract
The utility model discloses a gradient ceramic alloy composite furnace tube, which comprises a furnace tube and a high-temperature-resistant ceramic coating coated on the inner surface and the outer surface of the furnace tube, wherein a rough layer is formed on the inner wall surface of the furnace tube through sand blasting and polishing, a transition layer is coated on the surface of the rough layer, and the high-temperature-resistant ceramic coating is coated on the surface of the transition layer; the transition layer is a metal-ceramic composite layer. The inner surface and the outer surface of the furnace tube are coated with high-temperature-resistant ceramic coatings, so that the wear resistance and corrosion resistance of the furnace tube are improved; meanwhile, the metal-ceramic composite layer is arranged, the rough layer is used as a connecting surface, the combination tightness between the high-temperature-resistant ceramic coating and the furnace tube base material is improved, and the surface coating has excellent high-temperature abrasion resistance.
Description
Technical Field
The utility model relates to the technical field of furnace tubes, in particular to a gradient ceramic alloy composite furnace tube.
Background
Currently, heat-resistant steels for boiler tubes mainly include T/P22 and T/P23 low alloy ferritic steels containing 2% Cr, T/P91 and T/P92 high Cr ferritic steels containing 9% Cr, HCM12 and HCM12A high Cr ferritic steels containing 12% Cr, austenitic stainless steels represented by TP347H, and the like. The performance requirements of the boiler tubes are higher, and the cost reduction pressure faced by enterprises is continuously increased, so that the development of the bimetal boiler composite tube is receiving more and more attention.
During the operation of the boiler, the abrasion and corrosion of the furnace tube are serious. The boiler is easy to generate overheat tube explosion and furnace shutdown accidents in the period of about 6 months of operation. The position of the explosion tube is positioned at the inlet side of the high-temperature flue gas and is the position with the highest steam temperature and wall temperature. The corrosion products are continuously produced on the outer wall of the furnace tube under the influence of high-temperature corrosion, and the stress in the film layer is continuously increased, so that the furnace tube is cracked and detonated.
Disclosure of Invention
Aiming at the problems, the utility model aims to provide a gradient ceramic alloy composite furnace tube, wherein high-temperature resistant ceramic coatings are coated on the inner surface and the outer surface of the furnace tube, so that the wear resistance and corrosion resistance of the furnace tube are improved; meanwhile, the metal-ceramic composite layer is arranged, the rough layer is used as a connecting surface, the combination tightness between the high-temperature-resistant ceramic coating and the furnace tube base material is improved, and the surface coating has excellent high-temperature abrasion resistance.
The utility model is realized by adopting the following technical scheme:
the gradient ceramic alloy composite furnace tube comprises a furnace tube and a high-temperature-resistant ceramic coating coated on the inner surface and the outer surface of the furnace tube, wherein a rough layer is formed on the inner wall surface of the furnace tube through sand blasting and polishing, a transition layer is coated on the surface of the rough layer, and the high-temperature-resistant ceramic coating is coated on the surface of the transition layer;
the transition layer is a metal-ceramic composite layer.
Further, the outer surface of the furnace tube is provided with heat conduction fins which are in a ring shape and are perpendicular to the outer surface of the furnace tube.
Further, the width dimension of the joint of the heat conduction fin and the furnace tube is 0.5-2cm, and the height dimension of the heat conduction fin is 1-3cm.
Further, the surface of the heat conduction fin is coated with a high temperature resistant ceramic coating, and the thickness of the coating is 1.5-2+/-0.2 mm.
Further, adjacent furnace tubes are connected through connectors, and two ends of each connector are abutted with the heat conduction fins on two sides.
Further, fasteners are arranged on the outer surfaces of the two ends of the connector.
Furthermore, the outer pipe walls at the two ends of the connector are stepped to form a stepped part, and the surface of the stepped part is a conical surface.
Further, the inner walls of the two end parts of the fastening piece are consistent with the shape of the outer tube wall of the end part of the connector, so that the end part of the connector is contracted in the radial direction.
Further, the coating thickness of the transition layer is 0.2-2.0mm, and the coating thickness of the high-temperature-resistant ceramic coating is 1.5-2+/-0.2 mm.
The utility model has the technical effects that:
according to the utility model, the high-temperature resistant ceramic coating is coated on the inner surface and the outer surface of the furnace tube, so that the abrasion and corrosion resistance of the furnace tube is improved, and the service cycle of the furnace tube is further improved; meanwhile, in order to overcome the problem of interfacial delamination caused by the difference of thermal expansion coefficients of the alloy furnace tube and the ceramic coating, a metal-ceramic composite layer is arranged, a rough layer is used as a connecting surface, the combination between the high-temperature-resistant ceramic coating and the furnace tube base material is improved to be compact, and the surface coating has excellent high-temperature abrasion resistance.
Drawings
FIG. 1 is a schematic diagram of a gradient superalloy composite furnace tube according to the present utility model;
FIG. 2 is a schematic view of the cross-sectional structure of A-A of FIG. 1;
FIG. 3 is a schematic diagram of a composite furnace tube according to a first embodiment;
FIG. 4 is a schematic diagram of a composite furnace tube in a second embodiment;
fig. 5 is a schematic structural diagram of a connector in the second embodiment.
1, a furnace tube; 2. a high temperature resistant ceramic coating; 3. a rough layer; 4. a transition layer; 5. a heat conducting fin; 6. a connector; 7. a fastener; 8. a step portion; 9. and (5) a conical surface.
Detailed Description
The following describes specific embodiments of the present utility model in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the utility model, are not intended to limit the utility model.
As shown in fig. 1-4, a gradient ceramic alloy composite furnace tube 1 comprises a furnace tube 1 and a high-temperature-resistant ceramic coating 2 coated on the inner surface and the outer surface of the furnace tube 1, wherein a rough layer 3 is formed on the inner wall surface of the furnace tube 1 through sand blasting and polishing, a transition layer 4 is coated on the surface of the rough layer 3, and the high-temperature-resistant ceramic coating 2 is coated on the surface of the transition layer 4;
the transition layer 4 is a metal-ceramic composite layer.
According to the utility model, the high-temperature resistant ceramic coating 2 is coated on the inner surface and the outer surface of the furnace tube 1, so that the abrasion and corrosion resistance of the furnace tube 1 is improved, and the service cycle of the furnace tube 1 is further improved; meanwhile, in order to overcome the problem of interfacial delamination caused by the difference of thermal expansion coefficients of the alloy furnace tube 1 and the ceramic coating, a metal-ceramic composite layer is arranged, the rough layer 3 is used as a connecting surface, the bonding between the high-temperature-resistant ceramic coating 2 and the base material of the furnace tube 1 is improved, and the surface coating has excellent high-temperature abrasion resistance.
As shown in fig. 3, in the first embodiment of the present utility model:
the outer surface of the furnace tube 1 is provided with heat conduction fins 5, and the heat conduction fins 5 are annular and are perpendicular to the outer surface of the furnace tube 1.
In this embodiment, the width dimension of the connection between the heat conduction fin 5 and the furnace tube 1 is 0.5-2cm, and the height dimension of the heat conduction fin 5 is 1-3cm. Specifically, the width dimension of the heat conduction fin 5 is 1cm, and the height dimension of the heat conduction fin 5 is 2.5cm.
The design of low aspect ratio is favorable for improving the heat conduction performance of the heat conduction fins 5, improving the heat dissipation performance and avoiding the overhigh temperature of the furnace tube.
In the embodiment, the surface of the heat conduction fin 5 is coated with a high temperature resistant ceramic coating 2, and the thickness of the coating is 1.5-2+/-0.2 mm.
The surface of the heat conduction fin 5 is also coated with the high-temperature-resistant ceramic coating 2, so that the wear resistance of the bulge part on the surface of the furnace tube is improved, and the service life of the heat conduction fin 5 is prolonged.
As shown in fig. 4, in the second embodiment of the present utility model:
the adjacent furnace tubes 1 are connected through connectors 6, and two ends of each connector 6 are abutted against the heat conduction fins 5 on two sides.
When the long furnace tube structure is used for a long time, the middle performance is easy to be reduced under the impact of smoke and the high-temperature corrosion action, and the problems of coating peeling and furnace tube cracking are easy to occur. In this embodiment, the connector 6 is used to connect adjacent furnace tubes 1, and the connector 6 is used to fasten and limit the outer wall of the furnace tube 1, so as to reduce the thermal stress generated by high temperature to the furnace tube wall.
In this embodiment: the outer surfaces of the two ends of the connecting head 6 are provided with fasteners 7. Fastening of the connection head 6 is achieved by means of a fastening piece 7.
As shown in fig. 4, in the present embodiment: the outer pipe walls at the two ends of the connector 6 are stepped to form a step part 8, and the surface of the step part 8 is a conical surface 9.
The inner walls of the two ends of the fastening member 7 conform to the outer tube wall shape of the end of the connecting head 6, and the end of the connecting head 6 is contracted in the radial direction.
The connector 6 is fastened and limited through the fastener 7, so that the connector 6 is fastened and limited on the outer wall of the furnace tube 1, the thermal stress generated by high temperature on the wall of the furnace tube is reduced, and the cracking and tube explosion of the furnace tube caused by the increase of the stress in the furnace tube are avoided.
In the present utility model: the coating thickness of the transition layer 4 is 0.2-2.0mm, and the coating thickness of the high-temperature-resistant ceramic coating 2 is 1.5-2+/-0.2 mm.
The foregoing has shown and described the basic principles, principal features and advantages of the utility model. It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present utility model, and various changes and modifications may be made therein without departing from the spirit and scope of the utility model, which is defined by the appended claims. The scope of the utility model is defined by the appended claims and equivalents thereof.
Claims (9)
1. The gradient ceramic alloy composite furnace tube is characterized by comprising a furnace tube and a high-temperature-resistant ceramic coating coated on the inner surface and the outer surface of the furnace tube, wherein a rough layer is formed on the inner wall surface of the furnace tube through sand blasting and polishing, a transition layer is coated on the surface of the rough layer, and the high-temperature-resistant ceramic coating is coated on the surface of the transition layer;
the transition layer is a metal-ceramic composite layer.
2. The gradient ceramic alloy composite furnace tube according to claim 1, wherein heat conducting fins are arranged on the outer surface of the furnace tube, are annular and are perpendicular to the outer surface of the furnace tube.
3. The gradient ceramic alloy composite furnace tube according to claim 2, wherein the width dimension of the joint of the heat conducting fin and the furnace tube is 0.5-2cm, and the height dimension of the heat conducting fin is 1-3cm.
4. The gradient ceramic alloy composite furnace tube according to claim 2, wherein the surface of the heat conducting fin is coated with a high temperature resistant ceramic coating, and the thickness of the coating is 1.5-2+/-0.2 mm.
5. The gradient ceramic alloy composite furnace tube according to claim 2, wherein adjacent furnace tubes are connected through connectors, and two ends of each connector are abutted with heat conducting fins on two sides.
6. The gradient ceramic alloy composite furnace tube according to claim 5, wherein fasteners are arranged on the outer surfaces of two ends of the connecting head.
7. The gradient ceramic alloy composite furnace tube according to claim 6, wherein the outer tube walls at the two ends of the connector are stepped to form a stepped portion, and the surface of the stepped portion is a conical surface.
8. The gradient ceramic alloy composite furnace tube according to claim 7, wherein the inner walls of the two ends of the fastening piece are in the same shape as the outer tube walls of the ends of the connecting head, so that the ends of the connecting head shrink in the radial direction.
9. The gradient ceramic alloy composite furnace tube according to claim 1, wherein the coating thickness of the transition layer is 0.2-2.0mm, and the coating thickness of the high temperature resistant ceramic coating is 1.5-2+/-0.2 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320224731.9U CN220489129U (en) | 2023-02-16 | 2023-02-16 | Gradient ceramic alloy composite furnace tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320224731.9U CN220489129U (en) | 2023-02-16 | 2023-02-16 | Gradient ceramic alloy composite furnace tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220489129U true CN220489129U (en) | 2024-02-13 |
Family
ID=89833635
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320224731.9U Active CN220489129U (en) | 2023-02-16 | 2023-02-16 | Gradient ceramic alloy composite furnace tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220489129U (en) |
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2023
- 2023-02-16 CN CN202320224731.9U patent/CN220489129U/en active Active
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