Surfacing anticorrosion device for high-parameter waste incineration boiler

Abstract

The utility model discloses a high-parameter waste incineration boiler surfacing corrosion prevention device which comprises a first flue, one side of the first flue is fixedly connected with a second flue, the other side of the second flue is fixedly connected with a third flue, and the end, away from the second flue, of the upper end of the third flue is fixedly connected with a horizontal flue. An evaporation screen is arranged at the end, close to the third flue, of the horizontal flue, a third-level superheater is arranged on the side, away from the third flue, of the evaporation screen, and a second-level superheater B is arranged on the other side of the third-level superheater. A surfacing anti-corrosion measure is added to convection tubes of the third-stage superheater and the second-stage superheater B, so that the corrosion thinning speed of a water cooling wall and the convection tubes is reduced, the service life of the boiler is prolonged, the operation efficiency of the waste heat boiler of the waste incineration power plant is improved, and high-temperature corrosion and flue gas scouring of local parts of the waste heat boiler are effectively prevented.

Description

Technical Field

[0001] The utility model relates to a surfacing welding anti-corrosion device for a garbage incineration boiler, in particular to a surfacing welding anti-corrosion device for a high-parameter garbage incineration boiler, and belongs to the technical field of industrial technology application. Background Art

[0002] At present, the main steam parameters of waste heat boilers in domestic waste incineration power generation projects are mainly medium temperature and medium pressure parameters. In order to improve economic benefits, the main steam parameters of waste heat boilers in waste incineration power generation projects have gradually developed into high parameters. At present, medium temperature and medium pressure waste incineration waste heat boilers have not been designed with surfacing anti-corrosion measures. As the main steam parameters of waste heat boilers increase, the temperature of the water-cooled wall tubes increases, and the flue gas corrodes the water-cooled wall tubes more seriously, accelerating the thinning speed of the water-cooled wall tube wall, increasing the frequency of tube bursts, and reducing the service life of the boiler. Utility Model Content

[0003] The utility model aims to solve the shortcomings in the prior art and proposes a high-parameter garbage incineration boiler surfacing anti-corrosion device.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a high-parameter waste incineration boiler surfacing anti-corrosion device, comprising a first flue, a second flue is fixedly connected to one side of the first flue, a third flue is fixedly connected to the other side of the second flue, an upper end of the third flue is fixedly connected to a horizontal flue at one end away from the second flue, an evaporation screen is provided at one end of the horizontal flue close to the third flue, a third-stage superheater is provided on the side of the evaporation screen away from the third flue, a second-stage superheater B is provided on the other side of the third-stage superheater, a second-stage superheater A is provided on the other side of the second-stage superheater B, a first-stage superheater B is provided on the other side of the second-stage superheater A, a first-stage superheater A is provided on the other side of the first-stage superheater B, a first-stage superheater A is provided on the other side of the first-stage superheater B, the other end of the horizontal flue is fixedly connected to a first economizer flue, a second economizer flue is provided on the other side of the first economizer flue, two economizers are provided in the first economizer flue, and four economizers are provided in the second economizer flue.

[0005] Preferably, the upper ceiling of the first flue, the front wall, the first side wall, the second side wall, the steam-water connecting pipe (double-sided) between the first flue and the second flue and its connecting box, the four water-cooled walls not less than 2 meters below the first channel outlet window, the first water-cooled wall, the second water-cooled wall, the third water-cooled wall, the fourth water-cooled wall, the second flue ceiling, and the upper water-cooled wall of the second flue ash hopper are subjected to surfacing treatment. At the interface between the first interface and the second interface of the above-mentioned area and the castable, a transition section should be extended by 500mm to set the transition section, which also needs to be subjected to surfacing treatment. After the surfacing treatment, refractory castable is laid on its surface.

[0006] Preferably, the first two rows of superheater tubes and the last two rows of superheater tubes of the third-stage superheater, the first two rows of superheater tubes and the last two rows of superheater tubes of the second-stage superheater B, all areas where the above tubes are in contact with the flue gas and the wall penetration areas, and the above convection heating surface areas are subjected to surfacing treatment.

[0007] Preferably, the water-cooled wall tube row and superheater tube cladding layer are made of 625 nickel-based alloy welding wire material.

[0008] Preferably, the minimum thickness of the water-cooled wall surfacing is not less than 2 mm, and the minimum thickness of the superheater tube surfacing is not less than 1.2 mm.

[0009] The utility model proposes a high-parameter waste incineration boiler surfacing anti-corrosion device, which has the beneficial effects of increasing surfacing anti-corrosion measures on the first and second flue water-cooled wall tubes of the high-parameter waste incineration waste heat boiler, increasing surfacing anti-corrosion measures on the third-stage superheater and the second-stage superheater B convection tubes, reducing the corrosion and thinning rate of the water-cooled wall and the convection tube, extending the life of the boiler, improving the operating efficiency of the waste heat boiler of the waste incineration power plant, and effectively preventing high-temperature corrosion and flue gas scouring in local parts of the waste heat boiler. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic diagram of the structure of a high-parameter garbage incineration boiler cladding anti-corrosion device proposed in this utility model Figure 1 ;

[0011] Figure 2 This is a schematic diagram of the structure of a high-parameter garbage incineration boiler cladding anti-corrosion device proposed in this utility model Figure 2 ;

[0012] Figure 3 This is a schematic diagram of the structure of a three-stage superheater of a high-parameter garbage incineration boiler cladding anti-corrosion device proposed by the utility model;

[0013] Figure 4 This is a structural schematic diagram of a secondary superheater B of a high-parameter garbage incineration boiler cladding anti-corrosion device proposed by the utility model.

[0014] In the figure: 1. First flue; 2. Second flue; 3. Third flue; 4. Horizontal flue; 5. Evaporation screen; 6. Third superheater; 7. Second superheater B; 8. Second superheater A; 9. First superheater B; 10. First superheater A; 11. First economizer flue; 12. Second economizer flue; 13. Upper ceiling; 14. Front wall; 15. First side wall; 16. Second side wall; 17. Water-cooled wall; 18. The first water-cooled wall; 19. The second water-cooled wall; 20. The third water-cooled wall; 21. The fourth water-cooled wall; 22. The second flue ceiling; 23. The upper water-cooled wall of the ash hopper; 24. The first interface; 25. The second interface; 26. The first two rows of superheater tubes of the third-stage superheater; 27. The second two rows of superheater tubes after the third-stage superheater; 28. The first two rows of superheater tubes of the second-stage superheater B; 29. ​​The second two rows of superheater tubes after the second-stage superheater B; 30. Economizer. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0016] Reference Figure 1-4 A high-parameter waste incineration boiler surfacing anti-corrosion device comprises a first flue 1, one side of the first flue 1 is fixedly connected to a second flue 2, the other side of the second flue 2 is fixedly connected to a third flue 3, the upper end of the third flue 3 is fixedly connected to a horizontal flue 4 at one end away from the second flue 2, an evaporation screen 5 is provided at one end of the horizontal flue 4 close to the third flue 3, a third-stage superheater 6 is provided at one side of the evaporation screen 5 away from the third flue 3, and a second-stage superheater 6 is provided at the other side of the third-stage superheater 6 B7, a secondary superheater A8 is provided on the other side of the secondary superheater B7, a primary superheater B9 is provided on the other side of the secondary superheater A8, a primary superheater A10 is provided on the other side of the primary superheater B9, the other end of the horizontal flue 4 is fixedly connected with a first economizer flue 11, a second economizer flue 12 is provided on the other side of the first economizer flue 11, two economizers 30 are provided in the first economizer flue 11, and four economizers 30 are provided in the second economizer flue 12.

[0017] Furthermore, the upper ceiling 13 of the first flue 1, the front wall 14, the first side wall 15, the second side wall 16, the steam-water connecting pipe (double-sided) between the first flue and the second flue and its connecting box, the four water-cooled walls 17 not less than 2 meters below the first channel outlet window, the first water-cooled wall 18 of the second flue 2, the second water-cooled wall 19, the third water-cooled wall 20, the fourth water-cooled wall 21, the second flue ceiling 22, and the upper water-cooled wall 23 of the ash hopper of the second flue 2 are subjected to surfacing treatment. At the interface between the first interface 24 and the second interface 25 in the above-mentioned area and the castable, a transition section should be extended by 500mm to set the transition section, which also needs to be subjected to surfacing treatment. After the surfacing treatment, refractory castable is laid on its surface.

[0018] Furthermore, the first two rows of superheater tubes 26 and the last two rows of superheater tubes 27 of the third-stage superheater 6, the first two rows of superheater tubes 28 and the last two rows of superheater tubes 29 of the second-stage superheater B7, all areas where the above tubes are in contact with the flue gas and the wall penetration areas, and the above convection heating surface areas are subjected to surfacing welding.

[0019] Furthermore, the water-cooled wall tube row and superheater tube cladding layer adopts 625 nickel-based alloy welding wire material.

[0020] Furthermore, the minimum thickness of the water-cooled wall surfacing is not less than 2 mm, and the minimum thickness of the superheater tube surfacing is not less than 1.2 mm.

[0021] Working principle: When in use, the flue gas in the furnace of the incinerator flows from bottom to top to the first flue 1, and the flue gas flows to the second flue 2 after reaching the top of the first flue 1, the flue gas of the second flue 2 flows from top to bottom to the third flue 3, and the flue gas of the third flue 3 flows from bottom to top to the horizontal flue 4, the flue gas of the horizontal flue 4 passes through the evaporation screen 5, the third superheater 6, the second superheater B7, the second superheater A8, the first superheater B9, and the first superheater A10 and then reaches the first economizer flue 11, the flue gas passes through the economizer 30 and then reaches the second economizer flue 12, and the outlet of the second economizer flue 12 is connected to the flue gas purification system.

[0022] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A high-parameter waste incineration boiler cladding anti-corrosion device, comprising a first flue (1), characterized in that: One side of the first flue (1) is fixedly connected to the second flue (2), the other side of the second flue (2) is fixedly connected to the third flue (3), the upper end of the third flue (3) away from the second flue (2) is fixedly connected to the horizontal flue (4), the end of the horizontal flue (4) close to the third flue (3) is provided with an evaporation screen (5), the side of the evaporation screen (5) away from the third flue (3) is provided with a third-stage superheater (6), the other side of the third-stage superheater (6) is provided with a second-stage superheater B (7), and the other side of the second-stage superheater B (7) is provided with a second-stage superheater A secondary superheater A (8) is provided on the other side of the secondary superheater A (8), a primary superheater B (9) is provided on the other side of the primary superheater B (9), a primary superheater A (10) is provided on the other side of the primary superheater B (9), the other end of the horizontal flue (4) is fixedly connected with a first economizer flue (11), a second economizer flue (12) is provided on the other side of the first economizer flue (11), two economizers (30) are provided in the first economizer flue (11), four economizers (30) are provided in the second economizer flue (12), and the outlet of the second economizer flue (12) is connected to a flue gas purification system.

2. A high-parameter waste incineration boiler surfacing anti-corrosion device according to claim 1, characterized in that: The upper ceiling (13) of the first flue (1), the front wall (14), the first side wall (15), the second side wall (16), the steam-water connecting pipe between the first flue and the second flue and its connecting box, the four water-cooled walls (17) not less than 2 meters below the outlet window of the first channel, the first water-cooled wall (18), the second water-cooled wall (19), the third water-cooled wall (20), the fourth water-cooled wall (21), the ceiling (22) of the second flue, and the upper water-cooled wall (23) of the ash hopper of the second flue (2) are subjected to surfacing treatment, and the ceiling (13), the front wall (14), the first side wall (15), the second side wall (16) and the first flue (17) are subjected to surfacing treatment. The second side walls (16), the steam-water connecting pipe between the first flue and the second flue and its connecting box, the four water-cooled walls (17) not less than 2 meters below the first channel outlet window, the first water-cooled wall (18), the second water-cooled wall (19), the third water-cooled wall (20), the fourth water-cooled wall (21), the second flue ceiling (22), the second flue (2) ash hopper upper water-cooled wall (23) and the first interface (24) and the second interface (25) of the castable interface should be extended by 500 mm to set a transition section, which also needs to be subjected to cladding treatment. After the cladding treatment, refractory castables are laid on their surfaces.

3. According to claim 1, a high-parameter waste incineration boiler surfacing anti-corrosion device is characterized by: The first two rows of superheater tubes (26) and the last two rows of superheater tubes (27) of the third-stage superheater (6), the first two rows of superheater tubes (28) and the last two rows of superheater tubes (29) of the second-stage superheater B (7), all areas where the above tubes are in contact with the flue gas and the areas where they pass through the wall, and all areas where the tubes are in contact with the flue gas and the areas where they pass through the wall are subjected to surfacing treatment.

4. A high-parameter waste incineration boiler surfacing anti-corrosion device according to claim 2, characterized in that: The water-cooled wall and superheater tube cladding layers are made of 625 nickel-based alloy welding wire material.

5. A high-parameter waste incineration boiler surfacing anti-corrosion device according to claim 4, characterized in that: The minimum thickness of the water-cooled wall cladding is not less than 2 mm, and the minimum thickness of the superheater tube cladding is not less than 1.2 mm.

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