Water-cooled wall sealing housing

Abstract

The utility model discloses a water-cooled wall sealing housing. The utility model belongs to the technical field of circulating fluidized bed combustion. A water-cooled wall sealing housing comprises a water-cooled wall main body, the water-cooled wall main body is provided with an open hole, the water-cooled wall main body is provided with a sealing housing used for covering the open hole, the sealing housing comprises a plurality of groups of horizontal section housings and vertical section housings which are alternately connected, and a smooth transition section housing is arranged between any horizontal section housing and the correspondingly connected vertical section housing. According to the utility model, the smooth transition section shell is additionally arranged, so that the stress concentration of the corner part formed by the horizontal section shell and the vertical section shell of the sealing cover shell is reduced, the problems of cracking and leakage between the sealing cover shell and the water cooling wall main body are further reduced, and the reliability of a unit is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the circulating fluidized bed combustion technical field, concretely relates to a water cooling wall sealing cover shell. BACKGROUND

[0002] The circulating fluidized bed boiler main circulation loop includes hearth, cyclone separator, back feeder, a plurality of water cooling wall openings are arranged on the hearth as the main combustion equipment of the circulating fluidized bed boiler, in order to enhance the sealing property and the aesthetic property between the water cooling wall opening and the adjacent connecting part, the sealing cover shell is generally arranged at the water cooling wall opening, the sealing cover shell is generally rectangular structure with right angle corner, and the sealing cover shell steel plate is directly welded on the water cooling wall pipe around the water cooling wall opening.

[0003] With the development of the circulating fluidized bed boiler in the direction of large-scale, the expansion amount of the hearth height and width direction, coal feeding port, secondary air port and back material leg is larger and larger.Although the expansion joint type is used to absorb the expansion amount at the beginning of design, but multiple circulating fluidized bed boilers still have different degrees of leakage in the coal feeding port, secondary air port and back material port sealing cover shell area during actual use.Because there is temperature difference between the sealing cover shell steel plate and the water cooling wall pipe during the boiler hot state operation, the two will have different degrees of expansion, thereby stress concentration is generated locally, the welding seam between the sealing cover shell steel plate and the water cooling wall pipe is pulled apart, and the water cooling wall pipe leakage is caused. SUMMARY

[0004] In order to solve the problem of pulling apart and leakage of the sealing cover shell in the coal feeding port, secondary air port and back material port area, the application provides a water cooling wall sealing cover shell.

[0005] The embodiment of the utility model realizes by the following technical schemes:

[0006] The embodiment provides a water cooling wall sealing cover shell, which comprises a water cooling wall main body, the water cooling wall main body is provided with an opening, the water cooling wall main body is provided with a sealing cover shell for covering the opening, the sealing cover shell comprises a plurality of groups of alternately connected horizontal section shell bodies and vertical section shell bodies, and a smooth transition section shell body is arranged between any horizontal section shell body and the corresponding connected vertical section shell body.

[0007] The corner of the original sealing cover shell rich in edges and corners is replaced by the smooth transition section shell body, which can absorb and release the expansion stress of the sealing cover shell steel plate and the water cooling wall main body caused by temperature difference during the boiler hot state operation to a certain extent, stress concentration in the corner of the sealing cover shell can be avoided, the problems of pulling apart and leakage of the sealing cover shell are solved, the space between the opening on the water cooling wall main body and the adjacent connecting part is sealed, and smoke in the hearth is prevented from floating.

[0008] In some technical schemes of the utility model, the buffer groove is formed by rounding the middle part of the smooth transition section shell inward.

[0009] The buffer groove can fully absorb and release the expansion stress of the sealing cover shell and the water cooled wall body caused by temperature difference in the hot state operation of the boiler, so that the stress concentration of the corner formed by the direct connection of the horizontal section shell and the vertical section shell of the sealing cover shell is greatly reduced.

[0010] In some technical schemes of the utility model, the smooth transition section shell is connected with the horizontal section shell or the vertical section shell by rounding the corners.

[0011] The smooth transition section shell can be welded by three arc-shaped steel plates, and the flexibility of the smooth transition section shell is further improved, so that the expansion stress of the sealing cover shell and the water cooled wall body caused by temperature difference in the hot state operation of the boiler is further absorbed and released.

[0012] In some technical schemes of the utility model, the water cooled wall body and the sealing cover shell are connected with each other through sealing plugs. The water cooled wall body comprises water cooled wall pipes arranged at intervals, fins arranged between any two water cooled wall pipes, and the sealing plugs are fixed on the fins.

[0013] The side surface of the water cooled wall body is not a horizontal plane, and the plurality of sealing plugs are embedded and welded on the water cooled wall body, so that the sealing effect is achieved, and the plurality of sealing plugs are fixed on the fins between the water cooled wall pipes, so that the water cooled wall pipes are prevented from being damaged in the welding process of the sealing cover shell and the water cooled wall body.

[0014] In some technical schemes of the utility model, the sealing plugs are welded on the fins through fillet welding.

[0015] The fillet welding structure firmly connects two or more metal parts together through welding to form a firm connection point. This connection mode can withstand large dynamic force and pressure, and has high reliability and stability.

[0016] The technical scheme of the utility model has at least the following advantages and beneficial effects:

[0017] The utility model reduces the stress concentration of the corner formed by the horizontal section shell and the vertical section shell of the sealing cover shell by adding the smooth transition section shell, thereby reducing the cracking and leakage problems between the sealing cover shell and the water cooled wall body, and improving the reliability of the unit. BRIEF DESCRIPTION OF DRAWINGS

[0018] Fig. 1A schematic view of a water-cooled wall sealing cover shell according to an embodiment of the present application;

[0019] Fig. 2 A partial structure schematic view of a sealing cover shell in a water-cooled wall sealing cover shell according to an embodiment of the present application;

[0020] Fig. 3 A front view of a sealing cover shell in another water-cooled wall sealing cover shell according to an embodiment of the present application.

[0021] Icon: 1-water cooled wall main body, 2-opening, 3-sealing cover shell, 4-horizontal section shell, 5-vertical section shell, 6-smooth transition section shell, 7-buffer groove, 8-sealing plug, 9-water cooled wall pipe, 10-fin. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0024] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0025] In the description of the present application, it should be noted that if the positions or location relationships indicated by terms such as "inner" and "outer" are based on the positions or location relationships shown in the drawings, or are the positions or location relationships of the present application product when it is usually placed, they are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the present application.

[0026] In the description of the utility model, still need explaining, unless another explicit provision and limitation, if appearing term "arrangement", "installation", "configuration", "connection" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected, can be mechanical connection, also can be electrical connection, can be direct connection, also can be indirectly connected through intermediate medium, can be two element internal communication. For ordinary skilled in the art, can understand the specific meaning of the above-mentioned term in the utility model according to specific circumstances. Embodiment

[0027] Please refer to Figs. 1-3 The utility model provides a water cooling wall sealing shell, including water cooling wall main body 1, water cooling wall main body 1 is equipped with opening 2, water cooling wall main body 1 is equipped with the sealing shell 3 for covering opening 2, above-mentioned sealing shell 3 includes multiple groups of horizontal section shell 4 and vertical section shell 5 of alternative connection, arbitrary horizontal section shell 4 and corresponding connected vertical section shell 5 between all be equipped with smooth transition section shell 6.

[0028] The principle of the water cooling wall sealing shell: the water cooling wall main body 1 is surrounded to form a circulating fluidized bed boiler furnace; the opening 2 provided on the water cooling wall main body 1 is used to connect the equipment adjacent to the water cooling wall main body 1, such as coal, secondary air pipe, material return device, etc.; the sealing shell 3 shell is a closed shell sleeve formed by a steel plate, which is tightly connected with the water cooling wall main body 1. At present, the horizontal section shell 4 and the vertical section shell 5 of most sealing shell 3 shells are two groups, that is, the front view of the sealing shell 3 shell is a rectangle. A smooth transition section shell 6 is provided between each corner of the sealing shell 3 shell, that is, between the horizontal section shell 4 and the vertical section shell 5. The horizontal section shell 4, the vertical section shell 5 and the smooth transition section shell 6 are all made of steel plates, and the connection between the horizontal section shell 4, the vertical section shell 5 and the smooth transition section shell 6 is by welding.

[0029] Replacing the original corner of the sealing shell 3 shell with the smooth transition section shell 6 can absorb and release the expansion stress caused by the temperature difference between the steel plate of the sealing shell 3 shell and the water cooling wall main body 1 to a certain extent during the hot-state operation of the boiler, which can avoid stress concentration at the corner of the sealing shell 3 shell and solve the problems of cracking and leakage of the sealing shell 3 shell. At the same time, it can seal the space between the opening 2 on the water cooling wall main body 1 and the adjacent connecting components, avoiding the dispersion of flue gas in the furnace.

[0030] As a preferred embodiment, the middle part of the smooth transition section shell 6 is inwardly rounded to form a buffer groove 7.

[0031] In the above embodiment, the buffer groove 7 on the smooth transition section shell 6 can be processed in a bending manner; when the temperature of the water wall body 1 changes, it will be conducted to the sealing cover shell 3, and the buffer groove 7 is designed to be relatively smooth to the smooth transition section shell 6, which can fully absorb and release the expansion stress caused by the temperature difference between the sealing cover shell 3 and the water wall body 1 during the hot state operation of the boiler, thereby greatly reducing the stress concentration of the corner formed by the direct connection of the horizontal section shell 4 and the vertical section shell 5 of the sealing cover shell 3, and further reducing the cracking and leakage problems between the sealing cover shell 3 and the water wall, and improving the reliability of the unit.

[0032] As a more preferred embodiment, the smooth transition section shell 6 is connected between the horizontal section shell 4 or the vertical section shell 5.

[0033] In the above embodiment, the smooth transition section shell 6 can be welded by three arc-shaped steel plates; this design makes the smooth transition section shell 6 more flexible, further strengthening its absorption and release of the expansion stress caused by the temperature difference between the sealing cover shell 3 and the water wall body 1 during the hot state operation of the boiler.

[0034] As a more preferred embodiment, the water wall body 1 and the sealing cover shell 3 are connected to each other through the sealing plug 8, the water wall body 1 includes water wall pipes 9 arranged at intervals, fins 10 are arranged between any two water wall pipes 9, and the sealing plug 8 is fixed on the fin 10.

[0035] In the above embodiment, the side surface of the water wall body 1 is not a horizontal surface, and the pre-buried welding of the plurality of sealing plugs 8 on the water wall body 1 can play a role in sealing; the pre-buried welding of the plurality of sealing plugs 8 on the fins 10 between the water wall pipes 9 can avoid damage to the water wall pipes 9 during the welding of the sealing cover shell 3 and the water wall body 1.

[0036] As a more preferred embodiment, the sealing plug 8 is fillet welded on the fin 10.

[0037] The fillet weld structure firmly connects two or more metal parts together by welding to form a strong connection point, and this connection method can withstand large dynamic force and pressure, and has high reliability and stability.

[0038] The application provides a sealing cover shell of a water-cooled wall, which absorbs and releases expansion stress between a sealing cover shell 3 shell and a water-cooled wall body 1 caused by temperature difference between the sealing cover shell 3 shell and the water-cooled wall body 1 in a hot state of the boiler, so that stress concentration of an angle part formed by a horizontal section shell 4 and a vertical section shell 5 of the sealing cover shell 3 shell is greatly reduced, and then cracking and leakage between the sealing cover shell 3 shell and the water-cooled wall body 1 are reduced, and the reliability of the unit is improved.

[0039] The preferred embodiments of the present application are described above, but the present application is not limited to the above. For those skilled in the art, the present application can be variously changed and modified. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A sealing casing for a water-cooled wall, comprising a water-cooled wall body (1) provided with an opening (2), the water-cooled wall body (1) being provided with a sealing casing (3) for casing the opening (2), characterized in that, The sealing cover shell (3) comprises multiple groups of alternately connected horizontal section shells (4) and vertical section shells (5), and a smooth transition section shell (6) is arranged between any horizontal section shell (4) and the corresponding connected vertical section shell (5).

2. The waterwall seal casings of claim 1 wherein, The middle part of the smooth transition section shell (6) is inwardly rounded to form a buffer groove (7).

3. The waterwall sealing enclosure of claim 1, wherein, The smooth transition section shell (6) and the horizontal section shell (4) or the vertical section shell (5) are connected in a rounded manner.

4. The waterwall sealing enclosure of any of claims 1-3, wherein, The water-cooled wall main body (1) and the sealing cover shell (3) are connected to each other through sealing plug blocks (8), the water-cooled wall main body (1) comprises water-cooled wall pipes (9) arranged at intervals, a fin (10) is arranged between any two water-cooled wall pipes (9), and the sealing plug blocks (8) are fixed on the fins (10).

5. The waterwall sealing enclosure of claim 4, wherein, The sealing plug blocks (8) are fillet welded on the fins (10).

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