Low-load anti-abrasion plate for heating surface of cfb boiler

Abstract

The utility model provides a cfb boiler heating surface low-load anti-abrasion plate which comprises a transverse plate and a vertical plate, and a plurality of through holes are formed in the transverse plate and the vertical plate. The partition groove is formed in the middle of the side, away from the water wall tube, of the transverse plate and formed in the width direction of the transverse plate, so that when abnormal rigid collision happens to the transverse plate, deformation can be controlled to the side, where the transverse plate collides, of the transverse plate, and the deformation amplitude caused by the abnormal rigid collision to the whole transverse plate is reduced. The through holes are formed in the transverse plate and the vertical plate, on one hand, the weight of the anti-abrasion plate can be greatly reduced, so that the load of the heating surface of the boiler is greatly reduced, the output of the boiler is smoother, and the effects of reducing cost and improving efficiency are achieved; on the other hand, ash can smoothly pass through the anti-abrasion plate through the through holes, and inverted splayed abrasion of the root of the heating surface caused by ash accumulated on the plate surface is prevented; and smoke flows passing through the anti-abrasion plate can be collided and counteracted, so that the impact of the smoke flows on the next anti-abrasion plate is reduced, and the service life of the anti-abrasion plate is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of water-cooled wall wear prevention, and in particular to a low-load wear prevention plate for the heating surface of a CFB boiler. Background Art

[0002] Due to the working characteristics of CFB boilers, a large number of high-temperature, high-speed moving wall-adhering material particles close to the surface of the membrane wall tube array are generated in the furnace during operation. The scouring of these particles causes serious wear of the heating surface of the CFB boiler membrane wall (i.e., water-cooled wall). Many boilers experience wear and leakage of membrane wall tubes after a short period of operation.

[0003] The grid anti-wear technology can greatly reduce the wear of the heating surface of the CFB boiler during operation, prevent leakage or even pipe burst accidents caused by wear of the heating surface, thereby reducing the number of non-stop operations of the circulating fluidized bed boiler unit and effectively extending the continuous operation cycle of the circulating fluidized bed boiler. Compared with traditional anti-wear methods, the grid anti-wear technology has many advantages such as good protection effect, long protection cycle, low transformation cost, and convenient construction. Therefore, it has gradually been promoted and used in various power plants and enterprises and has been widely praised.

[0004] The principle of the grille anti-wear technology is to install a grille anti-wear plate on the surface of the heated surface to reduce the flow rate of the flue gas and ash flow against the wall, reduce the cutting and collision of the flue gas and ash flow on the surface of the heated surface, and thus achieve the anti-wear function.

[0005] The grating anti-wear plate includes a horizontal plate and a vertical plate. The horizontal plate is used to reduce the flow rate of the vertical flue gas and ash flow, and the vertical plate is used to reduce the flow rate of the horizontal flue gas and ash flow. The existing anti-wear plates have the following problems in actual use: first, a single anti-wear plate is heavy, and a large number of anti-wear plates are required for the entire boiler, resulting in a heavy weight of the entire grating anti-wear system, causing a large load on the boiler heating surface, posing a safety hazard; second, the existing anti-wear plates have poor permeability for flue gas and ash flow, and dust is easily accumulated on the surface of the anti-wear plates, resulting in "inverted eight" wear at the root of the heating surface. Summary of the invention

[0006] The present application provides a low-load anti-wear plate for the heating surface of a CFB boiler, which solves the problems in the prior art of heavy weight of the anti-wear plate of the grid and a large load on the heating surface of the boiler.

[0007] The present application provides a low-load anti-wear plate for a heating surface of a CFB boiler, comprising a horizontal plate and a vertical plate, wherein a plurality of through holes are formed on the horizontal plate and / or the vertical plate.

[0008] In the technical solution provided in the present application, by opening a number of through holes on the horizontal plate and the vertical plate, on the one hand, the weight of the anti-wear plate can be greatly reduced, thereby greatly reducing the load on the boiler heating surface, making the boiler output smoother, and playing a role in reducing costs and increasing efficiency; on the other hand, the through holes can also allow ash to pass through the anti-wear plate smoothly, preventing "inverted eight" wear at the root of the heating surface caused by ash accumulation on the plate; it can also make the flue gas flow passing through the anti-wear plate collide and offset each other, reducing the impact of the flue gas flow on the next layer of anti-wear plate, thereby extending the service life of the anti-wear plate.

[0009] In some embodiments, at least one arc-shaped recess is provided on one side of the transverse plate close to the water-cooled wall tube, and the inner wall of the arc-shaped recess fits with the outer wall of the water-cooled wall tube, thereby protecting the water-cooled wall tube and facilitating the installation and fixation of the transverse plate.

[0010] In some embodiments, an arch is formed between adjacent arc-shaped recesses, and the arch is fixed to the fins between adjacent water-cooled wall tubes by welding.

[0011] In some embodiments, the arch portion is provided with a first welding groove, which improves the firmness of welding between the cross plate and the fin.

[0012] In some embodiments, a dividing groove is provided in the middle of one side of the transverse plate away from the water-cooled wall tube, and the dividing groove is provided along the width direction of the transverse plate; by providing the dividing groove on the outer side of the transverse plate, when an abnormal rigid collision occurs, the deformation of the transverse plate can be controlled on the side where the collision occurs, thereby reducing the deformation amplitude of the entire transverse plate caused by the abnormal rigid collision.

[0013] In some embodiments, a snap buckle is provided at the front end or the rear end of the anti-wear plate, and the front ends and rear ends of adjacent anti-wear plates are connected by the snap buckle. Adjacent anti-wear plates do not need to be welded and fixed, and can be detachably connected by the snap buckle, which facilitates the installation and maintenance of the anti-wear plates.

[0014] In some embodiments, the buckle includes an outer buckle and an inner buckle, the spacing between the outer buckle and the inner buckle matches the thickness of the wear-resistant plate, and the outer buckle and the inner buckle cooperate to clamp the end of the adjacent wear-resistant plate without the buckle.

[0015] In certain embodiments, a thermal expansion gap is reserved between the ends of adjacent wear-resistant plates and the buckles to prevent the adjacent wear-resistant plates from being squeezed and falling off due to thermal expansion.

[0016] In some embodiments, a convex portion is provided on one side of the vertical plate close to the fin, and the convex portion is fixed to the fin by welding.

[0017] In some embodiments, the protrusion is provided with a second welding groove, which improves the firmness of welding between the vertical plate and the fin.

[0018] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings in this application are used to illustrate preferred embodiments, so that those skilled in the art can clearly understand various other advantages and benefits, and should not be considered as limitations of this application. In addition, the same reference numerals are used throughout the drawings to represent the same or similar components.

[0020] Figure 1 This is a schematic diagram of the assembly of the horizontal plate and the water-cooled wall in one embodiment of the present application;

[0021] Figure 2 This is a schematic diagram of a structure in which adjacent horizontal plates are connected by buckles in one embodiment of the present application;

[0022] Figure 3 This is a schematic diagram of the structure of welding the vertical plate and the fin in one embodiment of the present application;

[0023] Icons: 1. Horizontal plate; 2. Vertical plate; 3. Through hole; 4. Arc-shaped recess; 5. Water-cooled wall tube; 6. Fin; 7. Arch; 8. First welding groove; 9. Partition groove; 10. Buckle; 11. External buckle; 12. Internal buckle; 13. Thermal expansion gap; 14. Protrusion; 15. Second welding groove. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0025] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0026] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two (including two), unless otherwise clearly and specifically defined.

[0027] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0028] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0029] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0030] See also Figure 1-Figure 3 The embodiment of the present application provides a low-load anti-wear plate for the heating surface of a CFB boiler, comprising a horizontal plate 1 and a vertical plate 2, wherein a plurality of through holes 3 are formed on the horizontal plate 1 and / or the vertical plate 2.

[0031] In the technical solution provided in the present application, by opening a plurality of through holes 3 on the horizontal plate 1 and the vertical plate 2, on the one hand, the weight of the anti-wear plate can be greatly reduced, thereby greatly reducing the load on the boiler heating surface, making the boiler output smoother, and playing a role in reducing costs and increasing efficiency; on the other hand, the through holes 3 can also allow ash to pass through the anti-wear plate smoothly, preventing "inverted eight" wear at the root of the heating surface caused by ash accumulation on the plate; it can also make the flue gas flows passing through the anti-wear plate collide and offset each other, reducing the impact of the flue gas flow on the next layer of anti-wear plates, thereby extending the service life of the anti-wear plates.

[0032] In a specific embodiment, a plurality of through holes 3 are arranged in an array on both the horizontal plate 1 and the vertical plate 2. During the specific implementation, the through holes 3 can also be opened only on the horizontal plate 1 or the vertical plate 2 according to the needs.

[0033] Please continue reading Figure 1 In some embodiments, at least one arc-shaped recess 4 is provided on one side of the horizontal plate 1 close to the water-cooled wall tube 5, and the inner wall of the arc-shaped recess 4 fits with the outer wall of the water-cooled wall tube 5, thereby protecting the water-cooled wall tube 5 and facilitating the installation and fixation of the horizontal plate 1.

[0034] In a specific embodiment, an arc-shaped recess 4 is provided in the middle of one side of the transverse plate 1 close to the water-cooled wall tube 5, and half an arc-shaped recess is provided on each side. The half arc-shaped recesses at the ends of adjacent transverse plates 1 are spliced ​​to form a whole arc-shaped recess 4; the number of the arc-shaped recesses 4 can be flexibly adjusted according to the length of the transverse plate 1.

[0035] Please continue reading Figure 1 In some embodiments, an arch 7 is formed between adjacent arc-shaped recesses 4 , and the arch 7 is fixed to the fins 6 between adjacent water-cooled wall tubes 5 by welding.

[0036] Please continue reading Figure 1 In some embodiments, the arch portion 7 is provided with a first welding groove 8 to improve the firmness of the welding between the cross plate 1 and the fin 6 .

[0037] Please continue reading Figure 1 In some embodiments, a dividing groove 9 is provided in the middle of one side of the transverse plate 1 away from the water-cooled wall tube 5, and the dividing groove 9 is provided along the width direction of the transverse plate 1; by providing the dividing groove 9 on the outer side of the transverse plate 1, the deformation of the transverse plate 1 can be controlled on the side where the collision occurs when an abnormal rigid collision occurs (such as a collision of a lifting platform during maintenance, a collision caused by misoperation of maintenance personnel during maintenance, and materials falling from a high altitude, etc.), thereby reducing the deformation amplitude of the entire transverse plate 1 caused by the abnormal rigid collision.

[0038] Please continue reading Figures 1 to 3In some embodiments, a buckle 10 is provided at the front end or the rear end of the anti-wear plate, and the front ends and rear ends of adjacent anti-wear plates are connected by the buckle 10. Adjacent anti-wear plates do not need to be welded and fixed, and can be detachably connected by the buckle 10, which facilitates the installation and maintenance of the anti-wear plates.

[0039] Please continue reading Figure 2 In some embodiments, the buckle 10 includes an outer buckle 11 and an inner buckle 12, and the spacing between the outer buckle 11 and the inner buckle 12 matches the thickness of the wear-resistant plate. The outer buckle 11 and the inner buckle 12 cooperate to clamp the end of the adjacent wear-resistant plate where the buckle 10 is not provided.

[0040] In a specific embodiment, the buckle 10 includes two outer buckles 11 and one inner buckle 12, and the inner buckle 12 is located between the two outer buckles 11. The ends of adjacent anti-wear plates are clamped between the two outer buckles 11 and the one inner buckle 12. This design can improve the firmness of the connection between adjacent anti-wear plates through the buckle 10.

[0041] Please continue reading Figure 2 In some embodiments, a thermal expansion gap 13 is reserved between the ends of adjacent wear plates and the buckle 10, that is, the buckle 10 and the ends of the wear plates are not completely engaged. The purpose of this design is to prevent the adjacent wear plates from being squeezed and falling off due to thermal expansion.

[0042] Please continue reading Figure 3 In some embodiments, a protrusion 14 is provided on one side of the vertical plate 2 close to the fin 6 , and the protrusion 14 is fixed to the fin 6 by welding.

[0043] Please continue reading Figure 3 In some embodiments, the protrusion 14 is provided with a second welding groove 15 to improve the firmness of welding between the vertical plate 2 and the fin 6 .

[0044] In this embodiment, multi-layer and multi-channel transverse plates 1 and vertical plates 2 are respectively installed in the horizontal and vertical directions of the inner wall of the furnace to form a grid-type protection, so that the high-speed flowing flue gas and ash flow that adheres to the wall can be decelerated on the surface of the water-cooled wall, avoiding the high-speed flowing flue gas and ash flow from directly scouring the boiler water-cooled wall tubes 5, thereby effectively reducing the wear of the boiler water-cooled wall and preventing the water-cooled wall tubes 5 from wear and leakage.

[0045] In this embodiment, due to the opening design on the wear-resistant plate, the weight is greatly reduced compared with the traditional wear-resistant plate, and the load on the boiler is smaller. At the same load, more wear-resistant plates can be used, the spacing is smaller, and the anti-wear effect is better.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no contradiction or conflict, the various technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A low-load anti-wear plate for a heating surface of a CFB boiler, comprising a horizontal plate (1) and a vertical plate (2), characterized in that: A plurality of through holes (3) are provided on the transverse plate (1) and / or the vertical plate (2); a buckle (10) is provided at the front end or the rear end of the anti-wear plate, and the front ends and rear ends of adjacent anti-wear plates are connected via the buckle (10).

2. A low-load anti-wear plate for heating surface of a CFB boiler according to claim 1, characterized in that: At least one arc-shaped recess (4) is provided on one side of the transverse plate (1) close to the water-cooled wall tube (5), and the inner wall of the arc-shaped recess (4) is in contact with the outer wall of the water-cooled wall tube (5).

3. A low-load anti-wear plate for heating surface of a CFB boiler according to claim 2, characterized in that: An arch (7) is formed between adjacent arc-shaped notches (4), and the arch (7) is fixed to the fins (6) between adjacent water-cooled wall tubes (5) by welding.

4. A low-load anti-wear plate for heating surface of a CFB boiler according to claim 3, characterized in that: The arch portion (7) is provided with a first welding groove (8).

5. A low-load anti-wear plate for heating surface of a CFB boiler according to claim 1, characterized in that: A separation groove (9) is provided in the middle of one side of the transverse plate (1) away from the water-cooled wall tube (5), and the separation groove (9) is provided along the width direction of the transverse plate (1).

6. A low-load anti-wear plate for heating surface of a CFB boiler according to claim 1, characterized in that: The buckle (10) comprises an outer buckle (11) and an inner buckle (12), the spacing between the outer buckle (11) and the inner buckle (12) matches the thickness of the anti-wear plate, and the outer buckle (11) and the inner buckle (12) cooperate to clamp the end of the adjacent anti-wear plate without the buckle (10).

7. A low-load anti-wear plate for heating surface of a CFB boiler according to claim 1, characterized in that: A thermal expansion gap (13) is reserved between the ends of adjacent wear-resistant plates and the buckle (10).

8. A low-load anti-wear plate for heating surface of a CFB boiler according to claim 1, characterized in that: A convex portion (14) is provided on one side of the vertical plate (2) close to the fin (6), and the convex portion (14) is fixed to the fin (6) by welding.

9. A low-load anti-wear plate for heating surface of a CFB boiler according to claim 8, characterized in that: The convex portion (14) is provided with a second welding groove (15).

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