Fluidized bed furnace distribution plate sealing structure

Abstract

The utility model relates to a fluidized bed furnace distribution plate sealing structure which comprises a furnace shell, a distribution plate, an air bellow, an I-shaped steel beam and an inner supporting plate. A plurality of distribution plates are laid above the I-shaped steel beam above the air bellow; the device further comprises a first welding arc-shaped elastic material plate, a second welding arc-shaped elastic material plate, a bolt, an asbestos pad and a third welding arc-shaped elastic material plate. The structure can prevent the problem of weld crack caused by overlarge temperature difference and prevent leaked air from being blown out from a furnace corner.

Description

TECHNICAL FIELD

[0001] The present application relates to the sealing technical field, especially to a sealing structure of a distribution plate of a fluidized bed boiler. BACKGROUND

[0002] The fluidized bed boiler is a coal-fired boiler, and the furnace bottom structure of the fluidized bed boiler comprises, from bottom to top, a wind box, a supporting ring, an I-beam, a supporting ring, a distribution plate and a castable layer. For the fluidized bed boiler with multiple distribution plates abutting and paving to form a partition plate, sealing treatment is required between the distribution plates and between the furnace body of the fluidized bed boiler and the distribution plates during use. The traditional sealing between the distribution plates and the sealing between the furnace body of the fluidized bed boiler and the distribution plates both adopt a structure in which a half of a pressing strip is welded and sealed, and a castable is cast on the upper part to seal. With the running cycle of the fluidized bed boiler, welding cracking occurs in this structure, air leakage occurs from the castable gap to the furnace corner, and uneven air distribution and dead furnace in the furnace occur. CONTENT OF THE UTILITY MODEL

[0003] To solve or partially solve the problems in the related art, the present application provides a sealing structure of a distribution plate of a fluidized bed boiler, which can prevent welding cracking caused by excessive temperature difference and air leakage from the furnace corner.

[0004] The present application discloses a sealing structure of a distribution plate of a fluidized bed boiler, comprising a furnace shell, a distribution plate, a wind box, an I-beam and an inner supporting plate. The distribution plate is arranged as multiple pieces and is laid above the I-beam above the wind box. The sealing structure further comprises a first welded arc-shaped elastic material plate, a second welded arc-shaped elastic material plate, a bolt, an asbestos pad and a third welded arc-shaped elastic material plate.

[0005] The distribution plates abut each other, the asbestos pad is embedded at the abutting contact, the bolt connects the left and right distribution plates and clamps the asbestos pad, the first welded arc-shaped elastic material plate is welded on both sides of the arc of the first welded arc-shaped elastic material plate, and the first welded arc-shaped elastic material plate is arched upward and covers the gap between the two distribution plates.

[0006] One side of the arc of the second welded arc-shaped elastic material plate is welded and fixed on the furnace shell, the other side abuts against the distribution plate, the second welded arc-shaped elastic material plate is arched upward and covers the gap between the furnace shell and the distribution plate.

[0007] The inner supporting plate is welded and fixed on the furnace shell and located above the distribution plate to form a ring, and the third welded arc-shaped elastic material plate is welded on both sides of the arc of the third welded arc-shaped elastic material plate, covering the gap between the inner supporting plate and the distribution plate.

[0008] Optionally, the distance between the inner supporting plate and the distribution plate is 10 cm.

[0009] Optionally, the third welding arc-shaped elastic material arches towards the side away from the furnace shell, and the gap between the second welding arc-shaped elastic material and the third welding arc-shaped elastic material is filled with elastic material.

[0010] Optionally, the third welding arc-shaped elastic material arches towards the side away from the furnace shell, and the gap between the second welding arc-shaped elastic material and the third welding arc-shaped elastic material is filled with elastic material.

[0011] Optionally, an annular plate body is arranged at the abutting position of the distribution plate and the furnace shell, the distribution plate is inserted below the annular plate body, and one end of the second welding arc-shaped elastic material plate is welded to the plate body.

[0012] Optionally, the elastic arc-shaped material is a seamless steel pipe.

[0013] The technical scheme provided in the application has the following beneficial effects:

[0014] The application sets two sealing structures at the abutting position of the distribution plate and the furnace shell, which can prevent the blast from the lower air bellow from directly acting on the cast material, and sets one side of the sealing material as a free movable compression low joint structure, which prevents the welding seam from being cracked due to a large temperature difference. In addition, the second sealing structure can make the blast from the furnace bottom along the furnace wall to the second sealing structure when the first sealing structure fails, and the blast is blocked in the gap between the inner support plate and the distribution plate by the second sealing structure, thereby preventing the blast from leaking out of the furnace corner, avoiding the uneven distribution of the blast, and preventing the occurrence of the situation that the furnace is not connected.

[0015] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the application. BRIEF DESCRIPTION OF DRAWINGS

[0016] The above and other objects, features and advantages of the application will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings, in which like reference characters refer to like parts throughout the several views, and in which:

[0017] Figure 1 is a schematic diagram of a sealing structure at a gap in an embodiment of the application;

[0018] Figure 2 is a schematic diagram of a sealing structure at a gap two and a gap three in an embodiment of the application;

[0019] REFERENCE NUMERALS:

[0020] 1, furnace shell; 2, distribution plate; 3, second welded arc-shaped elastic material plate, 4, third welded arc-shaped elastic material plate; 5, bolt; 6, asbestos pad; 7, first welded arc-shaped elastic material plate; 11, inner supporting plate. DETAILED DESCRIPTION

[0021] Embodiments of the present application will be described in more detail with reference to the drawings. Although embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present application is more thoroughly and completely conveyed to those skilled in the art, and the scope of the present application is fully conveyed to those skilled in the art.

[0022] It should be understood that although the terms "first", "second", "third", etc. can be used in the present application to describe various information, these information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, the first information can also be referred to as the second information, and similarly, the second information can also be referred to as the first information without departing from the scope of the present application. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified.

[0023] In the description of the present application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0024] Unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0025] To solve the above problems, the present application provides a sealing structure of a distribution plate of a fluidized bed furnace, which will be described in detail below in combination with the drawings.

[0026] As Figure 1 and Figure 2The utility model provides a kind of sealing structure of fluidized bed distributor plate, mainly applied in the fluidized bed of multiple distributor plate butt joint paving composition baffle, generally, the furnace bottom structure of this fluidized bed includes wind box, supporting ring, I-beam, drag ring, distributor plate 2 from bottom to top, and, distributor plate 2 is mostly composed of multiple and laid on the I-beam above wind box, one is to facilitate the installation of the whole plate body, one is to avoid material stretching and shrinkage during use to affect use.

[0027] In the structure, generally, there are two points or parts needing sealing in the connection of distributor plate 2 in the fluidized bed, one is the gap or gap generated when distributor plate 2 is connected, and the other is the gap or gap between distributor plate 2 and furnace shell 1. In this application, three positions are selected for sealing, respectively:

[0028] Gap one, the connection gap between distributor plate 2, the sealing position is above the gap;

[0029] Gap two, the gap between distributor plate 2 and furnace shell 1, the sealing position is above the gap;

[0030] Gap three, the gap or gap between inner support plate 11 near gap two and distributor plate 2, which is artificially constructed, inner support plate 11 is directly welded on furnace shell 1, with a distance of 10 cm from distributor plate 2, which serves to bear the weight of furnace wall. The gap formed by the gap is towards the side, so the sealing position is set at the edge between inner support plate 11 near gap two and distributor plate 2.

[0031] The sealing material of the application is an arc-shaped elastic material plate after rolling. The reason for using arc-shaped elastic material plate is that the material of distributor plate 2 will expand when heated during use, so that the connection will crack during stretching and shrinking as the temperature in the furnace changes, especially for materials connected by welding. If the welding effect is not good, it is easy to form a crack at the welding point, which will affect the sealing effect of the gap.

[0032] Gap one adopts arc-shaped elastic material plate welding sealing, the two sides of the arc of the arc-shaped elastic material plate are welded on each distribution plate 2 respectively, before welding, bolt 5 is fixed first, then, the middle gap between the distribution plates 2 is filled with asbestos pad 6. After the two distribution plates 2 are fixed by bolt 5, the middle gap is filled with asbestos pad 6, in order to prevent the joint leakage from directly reaching the hearth, the traditional method is to use a pressing strip single-sided welding sealing, the disadvantage of this method is that it cannot effectively prevent air leakage. The improved full-welding sealing of the semi-arc-shaped elastic material plate can effectively prevent air leakage while preventing deformation and cracking caused by temperature difference.

[0033] Gap two adopts arc-shaped elastic material plate welding sealing, one side of the arc of the arc-shaped elastic material plate is welded and fixed on the furnace shell 1, and the other side is tightly pressed on the distribution plate 2. This sealing structure can prevent the blast from the lower air box from directly acting on the castable, causing the castable to be eroded and then to leak air. By using one side fixed and the other side free, the problem of weld cracking caused by excessive temperature difference is prevented.

[0034] Gap three adopts arc-shaped elastic material plate welding sealing, the two sides of the arc of the arc-shaped elastic material plate are welded on the inner support plate 11 and the distribution plate 2 respectively. When in use, one side of the arc-shaped elastic material plate is welded on the distribution plate 2 as a sealing ring or a support ring. After the sealing at gap two is installed, the gap is filled with rammed material, and then the sealing at this gap is installed, ensuring that the arc-shaped elastic material plate used for sealing at this gap is tightly filled with rammed material without any gap. If the sealing at gap two fails, the blast from the furnace bottom will come to the sealing at gap three along the castable on the furnace wall, and the arc-shaped elastic material plate will be blocked in the gap between the support ring and the distribution plate 2, preventing air leakage from the furnace corner. Thus, the blast from the castable gap to the furnace corner is avoided, which prevents uneven air distribution and causes the situation of dead furnace.

[0035] The present application sets two sealing structures at key positions, which can prevent the blast from the lower air box from directly acting on the castable. Meanwhile, one side of the sealing material is set as a tightly pressed low joint structure that can freely move, which prevents the weld from cracking caused by excessive temperature difference. In addition, the second sealing structure can make the blast from the furnace bottom come to the second sealing structure along the castable on the furnace wall when the first sealing structure fails, and the blast is blocked in the gap between the inner support plate and the distribution plate by the second sealing structure, preventing air leakage from the furnace corner. Thus, the blast from the castable gap to the furnace corner is avoided, which prevents uneven air distribution and causes the situation of dead furnace. Meanwhile, the sealing structure of the present application is simple and practical, and the actual sealing installation operation is simple, easy and good in sealing effect.

[0036] In one embodiment, as Figure 1 and Figure 2As shown, more specifically, the elastic arc-shaped material plate is selected from a seamless steel pipe, which is actually formed after 1 / 2 roll of the seamless steel pipe. Among them, the welding seal at the first welded arc-shaped elastic material plate 7 is sealed one, the seal at the second welded arc-shaped elastic material plate 3 is sealed two, and the seal at the third welded arc-shaped elastic material plate 4 is sealed three. The two distribution plates 2 of the structure are abutted against each other, and the gap between them is filled with asbestos pads 6 after abutting. The bolts 5 connect the left and right distribution plates 2 and clamp the asbestos pads 6 to prevent them from falling off. The two sides of the arc of the seamless steel pipe are welded on the abutted two distribution plates 2. The seamless steel pipe arches upward and covers gap one, thus forming a seal one, which can prevent the air leakage at the joint from directly reaching the hearth, effectively preventing air leakage, and can also prevent deformation and cracking caused by temperature difference by using the elastic deformation of the elastic material.

[0037] The side of the arc of the seamless steel pipe at the sealed two is welded and fixed on the furnace shell 1, and the other side is tightly pressed and abutted on the distribution plate 2. The seamless steel pipe arches upward and covers gap two to form a seal two. During welding, the side of the seamless steel pipe is slightly downward, so that the movable side of the seamless steel pipe at the sealed two can tightly press the distribution plate 2 under the elasticity of itself after the side welding is completed. Of course, another way to tightly press the distribution plate 2 is to fill the filler on it to press it.

[0038] In this application, the inner support plate 11 is 10 cm away from the distribution plate 2, and then the inner support plate 11 is welded and fixed on the furnace shell 1 to form a ring and is located above the distribution plate 2. On the one hand, the inner support plate 11 bears the weight of the furnace wall, and on the other hand, it provides force support for the filler above the seamless steel pipe to press against the inner support plate 11 to press the seamless steel pipe. The two sides of the arc of the seamless steel pipe at the sealed three are welded below one end of the inner support plate 11 and above the distribution plate 2 to cover gap three. In this way, when the seal at the sealed two fails, the blast from the furnace bottom follows the castable of the furnace wall to the sealed three, which is blocked by the seamless steel pipe at the sealed three to form a sealing ring at the gap, preventing air leakage from the furnace corner, and also avoiding cracking by using the elastic deformation of the elastic material.

[0039] In one embodiment, since the three welded elastic materials all adopt an arc-shaped structure, the direction of the arc-shaped surface is also crucial to the structure. When the seamless steel pipe at the sealed one arches upward, it can be sealed by welding only on the top. If the gap is large, it can be welded inwardly, but since there is castable on the distribution plate 2, it is necessary to form a recess to hold the castable by downwardly recessing, so it is also necessary to weld a seamless steel pipe that protrudes upward at the bottom to enhance the connection strength and avoid cracking under excessive force.

[0040] The seamless steel pipe of the third sealing position is arched to one side of the furnace shell 1, and the gap between the seamless steel pipe of the second sealing position and the seamless steel pipe of the third sealing position is filled with rammed material, which helps to tightly press the end of the seamless steel pipe of the second sealing position against the distribution plate and avoid the pressure of the cast material on the side.

[0041] In one embodiment, when the seamless steel pipe of the third sealing position is arched to one side of the furnace shell 1, the gap between the seamless steel pipe of the second sealing position and the seamless steel pipe of the third sealing position is filled with rammed material. When the seamless steel pipe of the third sealing position is arched to the side away from the furnace shell 1, the gap between the seamless steel pipe of the second sealing position and the seamless steel pipe of the third sealing position is filled with elastic material, so that the flexibility of the seamless steel pipe can be better guaranteed. The seamless steel pipe has certain elastic plasticity and sufficient support strength, so as to avoid the filling material or the cast material from pressing and preventing the expansion.

[0042] In one embodiment, an annular plate body is arranged at the abutting position of the distribution plate 2 and the furnace shell 1, the distribution plate 2 is inserted below the annular plate body, and one end of the second arc-shaped elastic material plate 3 is welded to the plate body. In this way, the welding and abutting of the seamless steel pipe of the second sealing position are facilitated.

[0043] Finally, it should be noted that the relationship terms such as first and second, etc. in this text are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between the entities or operations. Moreover, the term includes, contains or any other variant is intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment.

[0044] The units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, i.e. they can be located in one place or distributed on multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiment.

[0045] The above has described the embodiments of the present application, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those skilled in the art without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles, practical applications or improvements of the technology in the market, or to enable other ordinary skilled persons in the art to understand the embodiments disclosed herein.

Claims

1. A sealing structure of a fluidized bed furnace distribution plate, comprising a furnace shell (1), a distribution plate (2), a wind box, an I-beam, and an inner plate (11); the distribution plate (2) is arranged in multiple pieces and laid above the I-beam above the wind box; characterized in that: It also comprises a first welded arc-shaped elastic material plate (7), a second welded arc-shaped elastic material plate (3), a bolt (5), an asbestos pad (6), and a third welded arc-shaped elastic material plate (4); The distribution plates (2) abut against each other, and the asbestos pads (6) are embedded at the abutment positions. The bolt (5) connects the left and right distribution plates (2) and clamps the asbestos pads (6). The first welded arc-shaped elastic material plate (7) is welded on both sides of the abutted distribution plates (2), and the first welded arc-shaped elastic material plate (7) arches upward and covers the gap between the two distribution plates (2). The second welded arc-shaped elastic material plate (3) is welded on one side of the arc and fixed on the furnace shell (1), and the other side abuts against the distribution plate (2). The second welded arc-shaped elastic material plate (3) arches upward and covers the gap between the furnace shell (1) and the distribution plate (2). The inner supporting plate (11) is welded and fixed on the furnace shell (1) and located above the distribution plate (2) to form a ring. The third welded arc-shaped elastic material plate (4) is welded on both sides of the arc, one end below the inner supporting plate (11) and the other end above the distribution plate (2) to cover the gap between the inner supporting plate (11) and the distribution plate (2).

2. A fluidized bed boiler distribution plate sealing structure according to claim 1, characterized in that The inner supporting plate (11) is 10 cm away from the distribution plate (2).

3. A seal for a fluidized bed distributor plate as defined in claim 1, wherein: The third welded arc-shaped elastic material plate (4) arches towards one side of the furnace shell (1), and the gap between the second welded arc-shaped elastic material plate (3) and the third welded arc-shaped elastic material plate (4) is filled with rammed material.

4. A seal for a fluidized bed distributor plate as defined in claim 1, wherein: The third welded arc-shaped elastic material plate (4) arches away from one side of the furnace shell (1), and the gap between the second welded arc-shaped elastic material plate (3) and the third welded arc-shaped elastic material plate (4) is filled with elastic material.

5. A seal for a fluidized bed distributor plate as defined in claim 1, wherein: An annular plate body is arranged at the abutment position of the distribution plate (2) and the furnace shell (1). The distribution plate (2) is inserted below the annular plate body, and one end of the second welded arc-shaped elastic material plate (3) is welded on the plate body.

6. A seal for a fluid bed distributor plate according to claim 1 or 2 or 3 or 4 or 5 wherein: The arc-shaped elastic material plate is made of seamless steel pipe.

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