Secondary sealing structure of furnace top

Abstract

The utility model relates to the technical field of waste heat boilers, in particular to a furnace top secondary sealing structure which comprises a longitudinal header, a transverse header assembly, an evaporation tube bundle assembly, a sealing plate and an elastic sealing piece. The two longitudinal headers are arranged in parallel along the direction of the flue; the two ends of the transverse header assembly are connected with the two longitudinal headers correspondingly, and a supporting plate is arranged on one side of the transverse header assembly. The two ends of the evaporation tube bundle assembly are connected with the two longitudinal headers correspondingly, and the evaporation tube bundle assembly and the transverse header assembly are arranged in parallel. One side of the sealing plate is fixedly connected with the evaporation tube bundle assembly, and the other side is overlapped and slidably connected with the supporting plate; the elastic sealing piece is arranged in the length direction of the transverse header assembly, one side of the elastic sealing piece is in sealed connection with the transverse header assembly, and the other side of the elastic sealing piece is in sealed connection with the sealing plate. The sealing plate has the advantages that the kidney-shaped hole is formed in the sealing plate, so that the sealing plate has an expansion deformation space, meanwhile, secondary sealing is achieved through the elastic sealing piece, and the good sealing effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat boilers, in particular to a furnace top secondary sealing structure. Background Art

[0002] The horizontal waste heat boiler structure uses a sealing steel plate + Ω expansion joint sealing structure at the top of the evaporation tube bundle area. A steam soot blower is generally arranged near the evaporation tube bundle area. The sweeping radius of the steam soot blower is generally 1.5 to 2.5 meters. The pressure fluctuation when the steam soot blower is started will affect the sealing performance here.

[0003] At the same time, the top of the evaporator tube bundle area is relatively large, with a depth of 4 to 5 meters and a width of 0.7 to 1 meter, and there is no force point for support. If this part is sealed with a sealing steel plate and both ends are fixed by welding, the large thermal expansion during boiler operation will tear the sealing steel plate and cause the seal to fail. Utility Model Content

[0004] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a furnace top secondary sealing structure to solve at least one of the above technical problems.

[0005] The purpose of the utility model is achieved through the following technical solutions: a secondary sealing structure of a furnace top, comprising a longitudinal header, a transverse header assembly, an evaporating tube bundle assembly, a sealing plate and an elastic sealing member; the two longitudinal headers are arranged in parallel along the flue direction; the two ends of the transverse header assembly are respectively connected to the two longitudinal headers, and a support plate is arranged on one side of the transverse header assembly; the two ends of the evaporating tube bundle assembly are respectively connected to the two longitudinal headers, the evaporating tube bundle assembly is arranged in parallel with the transverse header assembly and is located on the side of the transverse header assembly where the support plate is located; one side of the sealing plate is fixedly connected to the evaporating tube bundle assembly, and the other side overlaps with the support plate and is slidably connected; the elastic sealing member is arranged along the length direction of the transverse header assembly, one side of the elastic sealing member is sealedly connected to the transverse header assembly, and the other side is sealedly connected to the sealing plate.

[0006] The utility model avoids a hard connection between the sealing plate and the support plate by setting a sliding connection between the sealing plate and the support plate, thereby avoiding cracks in the sealing plate and causing sealing failure when the pressure fluctuation is large when the steam soot blowing device is started. At the same time, since the sealing plate and the support plate are slidably connected, during the operation of the boiler, the high-temperature flue gas causes the sealing plate to expand thermally, and there is space for relative displacement between the sealing plate and the support plate, thereby avoiding the sealing plate from being torn and causing sealing failure. Since the overlapping and sliding connection between the sealing plate and the support plate cannot guarantee an absolute fit between the sealing plate and the support plate, an elastic seal is provided, and the sealing plate is sealed and connected to the transverse header assembly through the elastic seal, and a secondary seal is formed at the sliding connection between the sealing plate and the support plate to achieve a better sealing effect.

[0007] In some embodiments, a plurality of openings are provided on the support plate in the area overlapping with the sealing plate, and waist-shaped holes are provided on the sealing plate at positions corresponding to the openings, the length direction of the waist-shaped holes is consistent with the length direction of the longitudinal header, and the openings are connected to the waist-shaped holes by bolts. Through the waist-shaped holes on the sealing plate and the openings on the support plate, and in conjunction with bolt connection, when the sealing plate and the support plate are connected, when pressure fluctuations occur or the sealing plate expands due to heat, the sealing plate can generate a certain amount of slippage between the waist-shaped holes and the support plate, so as to avoid cracks and sealing failure caused by a hard connection between the sealing plate and the support plate.

[0008] In some embodiments, the transverse header assembly includes a transverse header and an embedded part pre-embedded in the transverse header, and the support plate is connected to the embedded part by welding. The embedded part provides a stable installation surface for the support plate.

[0009] In some embodiments, the cross-section of the elastic seal is U-shaped, the elastic seal forms a sealing groove in the length direction of the transverse header assembly, one side of the elastic seal is welded to the embedded part, and the other side is welded to the sealing plate. When the sealing plate and the support plate slide relative to each other, the spacing between the sealing plate and the embedded part changes, and the elastic seal with a U-shaped cross-section can use its own elasticity to deform to adapt to the change in the spacing between the sealing plate and the embedded part, while ensuring the sealing effect.

[0010] In some embodiments, the waist-shaped holes on the sealing plate are all located at the opening of the sealing groove, and the bolt heads of the bolts connected to the waist-shaped holes are all located in the sealing groove. The sealing groove formed by the elastic sealing member with a U-shaped cross-section covers the waist-shaped holes, and the bolt heads of the bolts connected to the waist-shaped holes are accommodated in the sealing groove, ensuring that the bolt connection is sealed.

[0011] In some embodiments, the evaporator tube bundle assembly includes an evaporator tube bundle and a mounting plate connected to one side of the evaporator tube bundle, and the sealing plate is welded to the mounting plate. The mounting plate provides a stable mounting surface for the sealing plate.

[0012] In some embodiments, a plurality of sealing plates are provided along the length direction of the transverse header assembly, and an Ω-shaped expansion joint is provided at the gap between adjacent sealing plates. When the sealing plate is heated and expanded, it will also expand along the direction of the transverse header. Therefore, in order to adapt to the thermal expansion of the sealing plate along the length direction of the transverse header, a plurality of sealing plates are provided, and the plurality of sealing plates are connected by Ω-shaped expansion joints.

[0013] In some embodiments, the elastic seal is provided in plurality corresponding to the plurality of sealing plates, and the end of the elastic seal forms a contact seal with the end face of the Ω-shaped expansion joint. When the sealing plates are provided in plurality, the Ω-shaped expansion joint will interfere with the elastic seal, and therefore, the elastic seal is provided in plurality to improve the sealing effect.

[0014] The utility model has the following advantages:

[0015] The utility model utilizes the sliding connection between the support plate and the sealing plate, so that when the pressure at the top of the evaporator tube bundle area fluctuates or the sealing plate undergoes thermal expansion, relative sliding occurs between the support plate and the sealing plate, thereby avoiding cracks and sealing failure caused by a hard connection between the support plate and the sealing plate. The sliding connection between the support plate and the sealing plate forms a primary seal. At the same time, an elastic sealing member is arranged between the support plate and the embedded parts on the transverse header to cover the sliding connection between the support plate and the sealing plate, thereby forming a secondary seal and ensuring a good sealing effect.

[0016] A plurality of sealing plates are arranged in the length direction of the transverse header, and the sealing plates are connected by Ω-shaped expansion joints to accommodate thermal expansion of the sealing plates along the length direction of the transverse header. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the furnace top secondary sealing structure of the utility model;

[0018] Figure 2 for Figure 1 Sectional view at AA (elastic seal not shown);

[0019] Figure 3 for Figure 1 Enlarged view of point B (bolts not shown);

[0020] Figure 4 It is a schematic diagram of the overall structure of the waste heat boiler of the utility model;

[0021] In the figure: 1. longitudinal header; 2. transverse header assembly; 21. transverse header; 22. embedded parts; 3. support plate; 4. evaporator tube bundle assembly; 41. evaporator tube bundle; 42. mounting plate; 5. sealing plate; 51. waist-shaped hole; 6. elastic sealing member; 61. sealing groove; 7. Ω-shaped expansion joint; 8. bolt. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the utility model clearer, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model, that is, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The components of the embodiments of the utility model described and shown in the drawings can be arranged and designed in various different configurations.

[0023] The present invention is further described below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following description.

[0024] like Figure 1-Figure 4 As shown, a furnace roof secondary sealing structure comprises a longitudinal header 1, a transverse header assembly 2, an evaporating tube bundle assembly 4, a sealing plate 5 and an elastic sealing member 6; the two longitudinal headers 1 are arranged in parallel along the flue direction; the two ends of the transverse header assembly 2 are respectively connected to the two longitudinal headers 1, and a support plate 3 is arranged on one side of the transverse header assembly 2; the two ends of the evaporating tube bundle assembly 4 are respectively connected to the two longitudinal headers 1, the evaporating tube bundle assembly 4 is arranged in parallel with the transverse header assembly 2 and is located on the side of the transverse header assembly 2 where the support plate 3 is located; one side of the sealing plate 5 is fixedly connected to the evaporating tube bundle assembly 4, and the other side overlaps with the support plate 3 and is slidably connected; the elastic sealing member 6 is arranged along the length direction of the transverse header assembly 2, one side of the elastic sealing member 6 is sealedly connected to the transverse header assembly 2, and the other side is sealedly connected to the sealing plate 5.

[0025] Specifically, in this embodiment, the support plate 3 is welded to the transverse header assembly 2, the sealing plate 5 is welded to the evaporator tube bundle assembly 4, the support plate 3 and the sealing plate 5 are both horizontally arranged, and the sealing plate 5 is laid on the support plate 3 at one end close to the support plate 3 and is slidably connected to the support plate 3; the elastic seal 6 is located on the top of the support plate 3 and the sealing plate 5, one side of the elastic seal 6 is connected to the transverse header assembly 2, and the other side is connected to the sealing plate 5, and the elastic seal 6 covers and seals the sliding connection between the sealing plate 5 and the support plate 3.

[0026] By setting the sealing plate 5 and the support plate 3 as a sliding connection, a hard connection between the sealing plate 5 and the support plate 3 is avoided, and when the sootblower starts to generate pressure fluctuations or the boiler is operated to generate thermal expansion, the sealing plate 5 and the support plate 3 are prevented from being torn and causing sealing failure; at the same time, since the sealing plate 5 is mounted on the support plate 3 and is slidably connected with the support plate 3, there is no absolute fit between the sealing plate 5 and the support plate 3. Therefore, in order to achieve a better sealing effect, an elastic sealing component is set between the sealing plate 5 and the transverse header assembly 2. When the sealing plate 5 and the support plate 3 slide relative to each other, the elastic sealing component can adapt to the relative position change between the sealing plate 5 and the support plate 3 by using its own elastic deformation. While the elastic sealing component is sealed and connected with the transverse header assembly 2 and the sealing plate 5, a secondary seal is formed at the sliding connection between the sealing plate 5 and the support plate 3 to achieve a better sealing effect.

[0027] Preferably, a plurality of openings are provided in the area overlapping the sealing plate 5 on the support plate 3, and waist-shaped holes 51 are provided at positions corresponding to the openings on the sealing plate 5, and the length direction of the waist-shaped holes 51 is consistent with the length direction of the longitudinal header 1, and the openings are connected to the waist-shaped holes 51 by bolts 8.

[0028] Specifically, in this embodiment, a plurality of waist-shaped holes 51 are evenly distributed along the length direction of the transverse header 21. It should be noted that in the present invention, although the bolts 8 connect the sealing plate 5 to the support plate 3 through the waist-shaped holes 51 and the openings, the bolts 8 are not completely tightened. Under certain pressure conditions, or when thermal expansion occurs during the operation of the boiler, a certain relative slippage can occur between the sealing plate 5 and the support plate 3, thereby achieving a sliding connection between the sealing plate 5 and the support plate 3. The length of the waist-shaped holes 51 in the present invention is designed according to the maximum expansion amount of the sealing plate 5 when the boiler is in operation.

[0029] Preferably, the transverse header assembly 2 includes a transverse header 21 and an embedded part 22 embedded in the transverse header 21, and the support plate 3 is welded to the embedded part 22. In this embodiment, the embedded part 22 provides a stable connection surface for the support plate 3, and the embedded part 22 in this embodiment is a flat steel, and the support plate 3 is welded to the flat steel.

[0030] Preferably, the cross-section of the elastic seal 6 is U-shaped, the elastic seal 6 forms a sealing groove 61 in the length direction of the transverse header assembly 2, one side of the elastic seal 6 is welded to the embedded part 22, and the other side is welded to the sealing plate 5. In this embodiment, the cross-section of the elastic seal 6 is U-shaped, and during the relative sliding process between the sealing plate 5 and the support plate 3, the elastic seal 6 with a U-shaped cross-section can adapt to the change of the relative position between the sealing plate 5 and the support plate 3 by its own deformation and ensure the sealing effect.

[0031] Preferably, the waist-shaped holes 51 on the sealing plate 5 are all located at the opening of the sealing groove 61, and the bolt heads of the bolts 8 connected to the waist-shaped holes 51 are all located in the sealing groove 61. In this embodiment, the sealing groove 61 formed by the elastic sealing member 6 covers the waist-shaped holes 51, and accommodates the bolt heads of the bolts 8 connected to the waist-shaped holes 51, so as to seal the connection between the sealing plate 5 and the bolts 8 of the support plate 3, thereby improving the sealing effect.

[0032] Preferably, the evaporation tube bundle assembly 4 includes an evaporation tube bundle 41 and a mounting plate 42 connected to one side of the evaporation tube bundle 41, and the sealing plate 5 is welded to the mounting plate 42. In this embodiment, the mounting plate 42 is horizontally arranged and welded to the evaporation tube bundle 41, and the sealing plate 5 is laid on the mounting plate 42 and welded to the mounting plate 42.

[0033] Preferably, a plurality of sealing plates 5 are provided along the length direction of the transverse header assembly 2, and an Ω-shaped expansion joint 7 is provided at the gap between adjacent sealing plates 5. In the process of thermal expansion of the sealing plate 5, expansion will occur not only in the longitudinal direction but also in the transverse direction. In order to avoid damage to the sealing plate 5 when the transverse thermal expansion occurs, a plurality of sealing plates 5 are provided, and an Ω-shaped expansion joint 7 is provided between two adjacent sealing plates 5. When the sealing plate 5 is thermally expanded, the Ω-shaped expansion joint 7 is deformed to adapt to the change in the spacing between the sealing plates 5. A contact seal is formed between the outer ends of the two outermost sealing plates 5 and the longitudinal header 1.

[0034] Preferably, the elastic seal 6 is provided in plurality corresponding to the plurality of sealing plates 5, and the end of the elastic seal 6 forms a contact seal with the end face of the Ω-shaped expansion joint 7. In the present embodiment, since the sealing plates 5 are provided in plurality and connected through the Ω-shaped expansion joint 7, the Ω-shaped expansion joint 7 interferes with the elastic seal 6, affecting the sealing effect. Therefore, in the present embodiment, a plurality of elastic seals 6 are provided, and one elastic seal 6 is provided corresponding to each sealing plate 5. The end of the elastic seal 6 forms a contact seal with the end face of the Ω-shaped expansion joint 7, and the outer ends of the two outermost elastic seals 6 form a contact seal with the longitudinal header 1.

[0035] The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Any technician familiar with the field can make many possible changes and modifications to the technical solution of the utility model by using the above-mentioned technical content without departing from the scope of the technical solution of the utility model, or modify it into an equivalent embodiment of equivalent changes. Therefore, any changes, modifications, equivalent changes and modifications made to the above embodiments based on the technology of the utility model without departing from the content of the technical solution of the utility model shall fall within the protection scope of the technical solution of the utility model.

Claims

1. A furnace top secondary sealing structure, characterized in that: include: A longitudinal header (1), wherein two longitudinal headers (1) are arranged in parallel along the flue direction; A transverse header assembly (2), wherein two ends of the transverse header assembly (2) are respectively connected to the two longitudinal headers (1), and a support plate (3) is provided on one side of the transverse header assembly (2); An evaporating tube bundle assembly (4), wherein both ends of the evaporating tube bundle assembly (4) are respectively connected to the two longitudinal headers (1), and the evaporating tube bundle assembly (4) is arranged in parallel with the transverse header assembly (2) and is located on a side of the transverse header assembly (2) where the support plate (3) is located; A sealing plate (5), one side of the sealing plate (5) is fixedly connected to the evaporating tube bundle assembly (4), and the other side of the sealing plate (5) overlaps and is slidably connected to the supporting plate (3); An elastic seal (6), wherein the elastic seal (6) is arranged along the length direction of the transverse header assembly (2), and one side of the elastic seal (6) is sealedly connected to the transverse header assembly (2), and the other side of the elastic seal (6) is sealedly connected to the sealing plate (5).

2. A furnace top secondary sealing structure according to claim 1, characterized in that: A plurality of openings are arranged in an area overlapping the sealing plate (5) on the support plate (3); waist-shaped holes (51) are arranged on the sealing plate (5) at positions corresponding to the openings; the length direction of the waist-shaped holes (51) is consistent with the length direction of the longitudinal header (1); and the openings and the waist-shaped holes (51) are connected by bolts (8).

3. A furnace top secondary sealing structure according to claim 1, characterized in that: The transverse header assembly (2) comprises a transverse header (21) and an embedded part (22) pre-embedded in the transverse header (21), and the support plate (3) is connected to the embedded part (22) by welding.

4. A furnace top secondary sealing structure according to claim 3, characterized in that: The cross-section of the elastic seal (6) is U-shaped. The elastic seal (6) forms a sealing groove (61) in the length direction of the transverse header assembly (2). One side of the elastic seal (6) is welded to the embedded part (22), and the other side is welded to the sealing plate (5).

5. A furnace top secondary sealing structure according to claim 4, characterized in that: The waist-shaped holes (51) on the sealing plate (5) are all located at the opening of the sealing groove (61), and the bolt heads of the bolts (8) connected to the waist-shaped holes (51) are all located in the sealing groove (61).

6. A furnace top secondary sealing structure according to claim 1, characterized in that: The evaporator tube bundle assembly (4) comprises an evaporator tube bundle (41) and a mounting plate (42) connected to one side of the evaporator tube bundle (41), and the sealing plate (5) is welded to the mounting plate (42).

7. A furnace top secondary sealing structure according to claim 1, characterized in that: A plurality of sealing plates (5) are arranged along the length direction of the transverse header assembly (2), and Ω-shaped expansion joints (7) are arranged in the gaps between adjacent sealing plates (5).

8. A furnace top secondary sealing structure according to claim 7, characterized in that: A plurality of the elastic sealing members (6) are provided corresponding to the plurality of sealing plates (5), and an end portion of the elastic sealing member (6) forms a contact seal with an end surface of the Ω-shaped expansion joint (7).

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