Cloth bag dust removal device and boiler flue gas desulfurization and denitrification device

Abstract

The invention relates to a cloth bag dust removal device and a boiler flue gas desulfurization and denitrification device.The cloth bag dust removal device comprises a shell, a dust removal cloth bag and an elastic buffer mechanism, a connecting cylinder is arranged on the shell wall of one side of the shell, a draught fan is arranged in the connecting cylinder, the dust removal cloth bag is arranged in the shell, and a bag opening of the dust removal cloth bag is connected to the connecting cylinder; the first elastic mechanisms are uniformly distributed on the inner surface of the shell wall of the shell at intervals in the circumferential direction of the dust collecting bag, the second elastic mechanism is arranged on the inner surface of the shell wall of the side, away from the connecting cylinder, of the shell, and the first elastic mechanisms and the second elastic mechanism provide buffering support for the radial direction and the bottom of the dust collecting bag correspondingly. The cloth bag dust removal device can limit expansion of the dust removal cloth bag and elastically buffer the expansion of the dust removal cloth bag, so that the phenomenon that the dust removal cloth bag explodes due to excessive expansion caused by blockage of pores after being used for a period of time is avoided, and the safety of the dust removal cloth bag is improved.

Description

Technical Field

[0001] The present invention relates to the field of environmental protection technologies, and particularly relates to a bag dust removal device and a boiler flue gas desulfurization and denitrification device. Background Art

[0002] The flue gas generated by a boiler needs to be subjected to desulfurization, denitrification, and dust removal treatment before it can be discharged. Generally, a bag filter is used in the dust removal process, that is, the flue gas is blown into the dust removal bag through a fan, and the particulate matter in the flue gas is filtered and intercepted by the dust removal bag, so as to achieve the effect of dust removal. However, with the increase of the use time of the existing dust removal bag, the pores on it will be gradually blocked, resulting in an increase in the internal pressure of the dust removal bag, and there may be a situation where the dust removal bag expands excessively and explodes, which has a certain degree of danger. Summary of the Invention

[0003] The first object of the present invention is to provide a bag dust removal device to avoid the situation that the dust removal bag expands excessively and explodes due to pore blockage after being used for a period of time, and improve the use safety of the dust removal bag.

[0004] The second object of the present invention is to provide a boiler flue gas desulfurization and denitrification device using the above bag dust removal device.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A bag dust removal device, comprising:

[0007] A housing, a connection cylinder is provided on one side wall of the housing, and a fan is provided in the connection cylinder;

[0008] A dust removal bag, the dust removal bag is arranged in the housing, and the bag mouth of the dust removal bag is connected to the connection cylinder;

[0009] An elastic buffer mechanism, the elastic buffer mechanism includes a first elastic mechanism that is circumferentially and evenly distributed on the inner surface of the housing wall of the housing along the circumference of the dust removal bag and a second elastic mechanism that is arranged on the inner surface of the housing wall on the side of the housing away from the connection cylinder. The first elastic mechanism is used for radially buffering and supporting the dust removal bag, and the second elastic mechanism is used for buffering and supporting the end of the dust removal bag away from the bag mouth.

[0010] In an embodiment of the present application, the housing includes a top wall, a bottom wall, and four circumferential side walls. The upper and lower ends of the four side walls are respectively connected to the top wall and the bottom wall. The connection cylinder is arranged on the top wall, an openable door body is arranged on one side wall, and the first elastic mechanism is respectively arranged on the inner surfaces of the other two opposite side walls, and the second elastic mechanism is arranged on the inner surface of the bottom wall.

[0011] In an embodiment of the present application, the first elastic mechanism includes a first support plate and a plurality of first elastic members, and the first elastic member includes:

[0012] A fixed cylinder, which is disposed at one of the inner surface of the lateral shell wall and the surface of the first support plate facing the lateral shell wall;

[0013] A connecting column, the first end of which is slidably nested in the fixed cylinder, the second end of which extends out of the fixed cylinder, and the second end of which is connected to the other of the inner surface of the lateral shell wall and the surface of the first support plate facing the lateral shell wall;

[0014] A spring, which is disposed between the first end of the connecting column and the fixed cylinder.

[0015] In an embodiment of the present application, a guiding and limiting sliding groove is provided at one of the inner wall of the fixed cylinder and the outer wall of the first end of the connecting column, and a guiding and limiting sliding block is provided at the other of the inner wall of the fixed cylinder and the outer wall of the first end of the connecting column. The guiding and limiting sliding block and the guiding and limiting sliding groove both extend along the length direction of the connecting column, and the guiding and limiting sliding block and the guiding and limiting sliding groove are in sliding fit.

[0016] In an embodiment of the present application, the surface of the first support plate for contacting the dust removal cloth bag is a concave arc surface.

[0017] In an embodiment of the present application, the second elastic mechanism includes a second support plate and a plurality of second elastic members uniformly distributed circumferentially along the second support plate. The second support plate is elastically disposed on the inner surface of the bottom shell wall through the second elastic members.

[0018] In an embodiment of the present application, a stop block for limiting the first support plate is provided on the inner surface of the lateral shell wall, and / or, a stop block for limiting the second support plate is provided on the inner surface of the bottom shell wall.

[0019] In an embodiment of the present application, a flexible protection pad is provided on the surfaces of the first support plate and the second support plate for contacting the dust removal cloth bag.

[0020] In an embodiment of the present application, mounting structures are provided on the outer surfaces of at least two oppositely arranged lateral shell walls.

[0021] A boiler flue gas desulfurization and denitrification device includes the bag dust removal device as described in any one of the above.

[0022] As can be seen from the above technical solutions, a bag dust removal device is disclosed in the present invention. The bag dust removal device includes a housing, dust removal bags, and an elastic buffer mechanism. Among them, a connecting cylinder is provided on one side wall of the housing, a fan is provided in the connecting cylinder, the dust removal bags are arranged in the housing, and the bag mouths of the dust removal bags are connected to the connecting cylinder. The elastic buffer mechanism includes a first elastic mechanism evenly distributed along the circumferential direction of the dust removal bags on the inner surface of the housing wall and a second elastic mechanism provided on the inner surface of the housing wall on the side of the housing away from the connecting cylinder. The first elastic mechanism is used to provide radial buffer support for the dust removal bags, and the second elastic mechanism is used to provide buffer support for the end of the dust removal bags away from the bag mouths.

[0023] During application, the fan blows air into the dust removal bags. The dust removal bags expand under the action of air pressure. The first elastic mechanism arranged around the circumferential direction of the dust removal bags provides support along the radial direction of the dust removal bags. At the same time, the second elastic mechanism provides support for the end of the dust removal bags away from the bag mouths, that is, the bottom of the dust removal bags, so as to limit the expansion of the dust removal bags and provide elastic buffering for the expansion of the dust removal bags, avoiding the phenomenon that the dust removal bags explode due to excessive blockage of pores and over-expansion after being used for a period of time, and improving the safety of the dust removal bags. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 It is the front view of the bag dust removal device provided by the embodiment of the present invention;

[0026] Figure 2 It is the side view of the bag dust removal device provided by the embodiment of the present invention;

[0027] Figure 3 It is the internal structure schematic diagram of the bag dust removal device provided by the embodiment of the present invention;

[0028] Figure 4 It is the structure schematic diagram of the first elastic member of the bag dust removal device provided by the embodiment of the present invention.

[0029] In the figure:

[0030] 1 is the housing; 101 is the top housing wall; 102 is the bottom housing wall; 103 is the lateral housing wall; 2 is the connecting cylinder; 3 is the door body; 4 is the hinge; 5 is the handle; 6 is the mounting structure; 7 is the mounting hole; 8 is the fan; 9 is the dust removal cloth bag; 10 is the first elastic mechanism; 1001 is the first support plate; 1002 is the first elastic member; 10021 is the fixed cylinder; 10022 is the connecting column; 10023 is the spring; 10024 is the guiding and limiting sliding groove; 10025 is the guiding and limiting sliding block; 11 is the second elastic mechanism; 1101 is the second support plate; 1102 is the second elastic member; 12 is the flexible protective pad; 13 is the stop block. Detailed implementation manners

[0031] One of the cores of the present invention is to provide a bag dust removal device, and the structural design of the bag dust removal device enables it to avoid the situation that the dust removal cloth bag expands and explodes excessively due to the blockage of pores after being used for a period of time, thereby improving the use safety of the dust removal cloth bag.

[0032] Another core of the present invention is to provide a boiler flue gas desulfurization and denitrification device adopting the above bag dust removal device.

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0034] Please refer to Figures 1 to 3 , Figure 1 , which is the front view of the bag dust removal device provided by the embodiment of the present invention, Figure 2 , which is the side view of the bag dust removal device provided by the embodiment of the present invention, Figure 3 , which is the internal structure schematic diagram of the bag dust removal device provided by the embodiment of the present invention.

[0035] An embodiment of the present invention discloses a bag dust removal device, and the bag dust removal device includes a housing 1, a dust removal cloth bag 9, and an elastic buffer mechanism.

[0036] Among them, the housing 1 has an inner cavity for accommodating the dust removal cloth bag 9. A connecting cylinder 2 is provided on one side wall of the housing 1. The connecting cylinder 2 is circumferentially closed and axially penetrated. A fan 8 is arranged inside the connecting cylinder 2. The dust removal cloth bag 9 is arranged inside the housing 1, and the bag mouth of the dust removal cloth bag 9 is connected to the connecting cylinder 2. The dust removal cloth bag 9 is communicated with the flue through the connecting cylinder 2. During use, the flue gas directly enters the dust removal cloth bag 9 through the connecting cylinder 2, and the flue gas filtered by the dust removal cloth bag 9 then enters the inner cavity of the housing 1 and is finally discharged. The elastic buffer mechanism includes a first elastic mechanism 10 that is circumferentially and evenly distributed on the inner surface of the wall of the housing 1 along the circumference of the dust removal cloth bag 9 and a second elastic mechanism 11 arranged on the inner surface of the wall of the housing 1 on the side of the housing 1 away from the connecting cylinder 2. The first elastic mechanism 10 is used to provide radial buffer support for the dust removal cloth bag 9, and the second elastic mechanism 11 is used to provide buffer support for the end of the dust removal cloth bag 9 away from the bag mouth. According to the shape of the dust removal cloth bag 9 after expansion and the number of the first elastic mechanism 10 and the second elastic mechanism 11, the surfaces of the first elastic mechanism 10 and the second elastic mechanism 11 for contacting the dust removal cloth bag 9 are flat or curved surfaces.

[0037] Compared with the prior art, when the bag dust removal device provided by the embodiment of the present invention is applied, the fan 8 blows air into the dust removal cloth bag 9. The dust removal cloth bag 9 expands under the action of air pressure. The first elastic mechanism 10 arranged circumferentially around the dust removal cloth bag 9 provides support along the radial direction of the dust removal cloth bag 9. At the same time, the second elastic mechanism provides support for the end of the dust removal cloth bag 9 away from the bag mouth, that is, the bottom of the dust removal cloth bag 9, so as to limit the expansion of the dust removal cloth bag 9 and perform elastic buffering on the expansion of the dust removal cloth bag 9, avoiding the phenomenon that the dust removal cloth bag 9 explodes due to excessive blockage of pores and over-expansion after being used for a period of time, and improving the safety of the dust removal cloth bag 9.

[0038] As Figure 1 and Figure 2 shown, in an embodiment of the present application, the housing 1 adopts a cuboid structure, that is, the housing 1 includes a top wall 101, a bottom wall 102 and four circumferential side walls 103. The upper and lower ends of the four side walls 103 are respectively connected to the top wall 101 and the bottom wall 102. The connecting cylinder 2 is arranged on the top wall 101. An openable door body 3 is arranged on one side wall 103. The door body 3 can rotate relative to the housing 1 through a hinge 4, which is convenient for staff to clean and install and replace the dust removal cloth bag 9. To facilitate the opening and closing of the door body 3, a handle 5 is arranged on the outer surface of the door body 3 on the side away from the hinge 4. The first elastic mechanism 10 is respectively arranged on the inner surfaces of the other two relatively arranged side walls 103. Although only two first elastic mechanisms 10 are arranged in the embodiment of the present application, the two first elastic mechanisms 10 can surround the dust removal cloth bag 9 as much as possible by designing the shape and size of the contact surface between the first elastic mechanism 10 and the dust removal cloth bag 9. The second elastic mechanism 11 is arranged on the inner surface of the bottom wall 102.

[0039] Of course, it should be noted that the first elastic structure can also be provided on the door body 3 and the lateral shell wall 103 opposite to the door body 3, so as to elastically buffer and support the dust removal cloth bag 9 from all around the dust removal cloth bag 9.

[0040] As Figure 3 shown, in a specific embodiment of the present application, the first elastic mechanism 10 includes a first support plate 1001 and a plurality of first elastic members 1002. Each of the first elastic members 1002 is arranged at intervals along the circumferential direction of the first support plate 1001. The projection of the first support plate 1001 on the lateral shell wall 103 where the first elastic structure is provided includes, but is not limited to, a rectangle, a circle or an ellipse. According to the difference in the three-dimensional shape of the first support plate 1001, the lengths and / or strokes of the respective first elastic members 1002 can be the same or different, that is, the strokes of the first elastic members 1002 at each location need to be designed according to the shape of the first support plate 1001 and the inner surface shape of the lateral shell wall 103. The first elastic member 1002 includes a fixed cylinder 10021, a connecting column 10022 and a spring 10023. Among them, the fixed cylinder 10021 is provided at one of the inner surface of the lateral shell wall 103 and the surface of the first support plate 1001 facing the lateral shell wall 103. The first end of the connecting column 10022 is slidably nested in the fixed cylinder 10021. The second end of the connecting column 10022 extends out of the fixed cylinder 10021, and the second end of the connecting column 10022 is connected to the other of the inner surface of the lateral shell wall 103 and the surface of the first support plate 1001 facing the lateral shell wall 103. The spring 10023 is provided between the first end of the connecting column 10022 and the fixed cylinder 10021.

[0041] It can be foreseen that in the actual application process, the connection part between the first elastic member 1002 and the lateral shell wall 103 is a stress concentration point. Therefore, the connection strength at this point should be increased. As Figure 3 shown, in a specific embodiment of the present application, the fixed cylinder 10021 is provided on the inner surface of the lateral shell wall 103, and the second end of the connecting column 10022 is connected to the surface of the first support plate 1001 facing the lateral shell wall 103. The cross-sectional dimension of the fixed cylinder 10021 is larger than the cross-sectional dimension of the connecting column 10022. In this way, the connection area between the first elastic member 1002 and the lateral shell wall 103 can be increased. Of course, a reinforcing rib can also be provided between the fixed cylinder 10021 and the inner surface of the lateral shell wall 103 to further improve the connection strength between the first elastic member 1002 and the lateral shell wall 103.

[0042] To further optimize the above technical solution, in an embodiment of the present application, as Figure 4As shown, a guiding and limiting sliding groove 10024 is provided at one of the inner wall of the fixed cylinder 10021 and the outer wall of the first end of the connecting column 10022. One or more guiding and limiting sliding grooves 10024 can be provided, which are arranged at intervals in the circumferential direction. At the other of the inner wall of the fixed cylinder 10021 and the outer wall of the first end of the connecting column 10022, a guiding and limiting sliding block 10025 is provided. The number of the guiding and limiting sliding blocks 10025 is equal to or less than that of the guiding and limiting sliding grooves 10024. Both the guiding and limiting sliding block 10025 and the guiding and limiting sliding groove 10024 extend along the length direction of the connecting column 10022. The guiding and limiting sliding block 10025 is in sliding fit with the guiding and limiting sliding groove 10024. In Figure 4 In the illustrated embodiment, the guiding and limiting sliding groove 10024 is provided on the inner wall of the fixed cylinder 10021, and the guiding and limiting sliding block 10025 is provided on the outer wall of the connecting column 10022. The fixed cylinder 10021 and the connecting column 10022 are matched through the guiding and limiting sliding groove 10024 and the guiding and limiting sliding block 10025 to improve the stability of the relative movement between the fixed cylinder 10021 and the connecting column 10022 and prevent the connecting column 10022 from rotating relative to the fixed cylinder 10021.

[0043] In order to increase the contact area between the first support plate 1001 and the dust removal cloth bag 9, in an embodiment of the present application, the surface of the first support plate 1001 for contacting the dust removal cloth bag 9 is a concave arc surface. It is not difficult to think that when the dust removal cloth bag 9 expands under air pressure, its outer circumferential surface is usually a convex arc surface. Therefore, by setting the surface of the first support plate 1001 contacting the dust removal cloth bag 9 as a concave arc surface, the shape adaptability between the first support plate 1001 and the dust removal cloth bag 9 can be improved. Compared with a flat surface, the concave arc surface can better contact and cooperate with the dust removal cloth bag 9 and apply a more uniform supporting force to the dust removal cloth bag 9.

[0044] As Figure 3 shown, in an embodiment of the present application, the second elastic mechanism 11 includes a second support plate 1101 and a plurality of second elastic members 1102 evenly distributed in the circumferential direction of the second support plate 1101. The second elastic members 1102 can adopt the same structure as the above-mentioned first elastic member 1002 or can be of different structures. In Figure 3 In the illustrated embodiment, since the second elastic member 1102 is provided on the bottom shell wall 102 and only needs to make reciprocating movements up and down, unlike the elastic member provided on the side shell wall 103 that is prone to deformation in other directions, the second elastic member 1102 is a compression spring 10023. The second support plate 1101 is elastically arranged on the inner surface of the bottom shell wall 102 through the second elastic member 1102.

[0045] To further optimize the above technical solution, in order to prevent the first support plate 1001 from colliding with the lateral shell wall 103 or the second support plate 1101 from colliding with the bottom shell wall 102, in an embodiment of the present application, a stop block 13 for limiting the first support plate 1001 is provided on the inner surface of the lateral shell wall 103, and / or a stop block 13 for limiting the second support plate 1101 is provided on the inner surface of the bottom shell wall 102. Further, an elastic buffer pad can be provided on the stop block 13, and the elastic buffer pad can be made of materials such as silica gel and rubber.

[0046] It can be foreseen that the dust removal cloth bag 9 is soft in material and must have a complete surface to achieve a good dust filtration effect. Therefore, in order to prevent the first support plate 1001 and the second support plate 1101 from scratching the dust removal cloth bag 9 during contact with the dust removal cloth bag 9, in an embodiment of the present application, a flexible protection pad 12 is provided on the surfaces of the first support plate 1001 and the second support plate 1101 for contacting the dust removal cloth bag 9, and the flexible protection pad 12 is made of latex material.

[0047] Further, the edges and corners of the first support plate 1001 and the second support plate 1101 both have rounded corner structures to avoid forming sharp corners and scratching the dust removal cloth bag 9, thereby improving the service life of the dust removal cloth bag 9.

[0048] For the convenience of fixedly installing the housing 1, in an embodiment of the present application, as Figure 1 and Figure 2 shown, mounting structures 6 are provided on the outer surfaces of at least two oppositely arranged lateral shell walls 103, and at least one mounting hole 7 is provided on the mounting structure 6.

[0049] An embodiment of the present application further provides a boiler flue gas desulfurization and denitrification device, which includes the bag dust removal device as described in the above embodiment. Since the boiler flue gas desulfurization and denitrification device adopts the above bag dust removal device, the technical effects of the boiler flue gas desulfurization and denitrification device can be referred to the above embodiment.

[0050] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other.

[0051] As shown in the present application and the claims, unless the context clearly indicates an exceptional situation, words such as "a", "one", "kind" and / or "the" are not specifically singular and may also include plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of the steps and elements that have been clearly identified, and these steps and elements do not constitute an exclusive list.

[0052] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0053] It should also be noted that in this text, terms such as "comprising", "including" or any other variants thereof are intended to cover non-exclusive inclusion, so that an article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or also includes elements inherent to such article or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the presence of another identical element in the article or device comprising the above elements.

[0054] Specific examples are used in this text to elaborate on the principles and implementation modes of the present invention. The description of the above embodiments is only used to help understand the core idea of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principles of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A bag dust removal device, characterized in that: include: A shell (1), a connecting tube (2) being arranged on a shell wall of one side of the shell (1), and a fan (8) being arranged inside the connecting tube (2); A dust removal bag (9), the dust removal bag (9) being arranged in the shell (1), and the bag opening of the dust removal bag (9) being connected to the connecting tube (2); An elastic buffer mechanism, the elastic buffer mechanism comprising a first elastic mechanism (10) uniformly distributed on the inner surface of the shell wall of the shell (1) at circumferential intervals along the dust bag (9), and a second elastic mechanism (11) arranged on the inner surface of the shell wall of the shell (1) away from the connecting tube (2), the first elastic mechanism (10) being used for radially buffering and supporting the dust bag (9), and the second elastic mechanism (11) being used for buffering and supporting the end of the dust bag (9) away from the bag opening.

2. The bag dust removal device according to claim 1, characterized in that: The shell (1) comprises a top shell wall (101), a bottom shell wall (102) and four circumferential side shell walls (103); the upper and lower ends of the four side shell walls (103) are respectively connected to the top shell wall (101) and the bottom shell wall (102); the connecting tube (2) is arranged on the top shell wall (101); one of the side shell walls (103) is provided with an openable and closable door body (3); the first elastic mechanism (10) is respectively provided on the inner surfaces of the other two oppositely arranged side shell walls (103); and the second elastic mechanism (11) is provided on the inner surface of the bottom shell wall (102).

3. The bag dust removal device according to claim 2, characterized in that: The first elastic mechanism (10) comprises a first support plate (1001) and a plurality of first elastic members (1002), wherein the first elastic members (1002) comprise: a fixed cylinder (10021), the fixed cylinder (10021) being arranged at one of the inner surface of the lateral shell wall (103) and the surface of the first support plate (1001) facing the lateral shell wall (103); a connecting column (10022), wherein a first end of the connecting column (10022) is slidably nested in the fixing tube (10021), a second end of the connecting column (10022) extends out of the fixing tube (10021), and the second end of the connecting column (10022) is connected to an inner surface of the lateral shell wall (103) and another point of a surface of the first support plate (1001) facing the lateral shell wall (103); A spring (10023), wherein the spring (10023) is arranged between the first end of the connecting column (10022) and the fixing tube (10021).

4. The bag dust removal device according to claim 3, characterized in that: A guide limit slide groove (10024) is provided at one of the inner wall of the fixed cylinder (10021) and the outer wall of the first end of the connecting column (10022), and a guide limit slider (10025) is provided at another of the inner wall of the fixed cylinder (10021) and the outer wall of the first end of the connecting column (10022). Both the guide limit slider (10025) and the guide limit slide groove (10024) extend along the length direction of the connecting column (10022), and the guide limit slider (10025) and the guide limit slide groove (10024) are slidably matched.

5. The bag dust removal device according to claim 3, characterized in that: The surface of the first support plate (1001) that is used to contact the dust removal bag (9) is a concave arc-shaped surface.

6. The bag dust removal device according to any one of claims 3 to 5, characterized in that: The second elastic mechanism (11) comprises a second support plate (1101) and a plurality of second elastic members (1102) uniformly distributed along the circumference of the second support plate (1101); the second support plate (1101) is elastically arranged on the inner surface of the bottom shell wall (102) via the second elastic members (1102).

7. The bag dust removal device according to claim 6, characterized in that: The inner surface of the lateral shell wall (103) is provided with a stopper (13) for limiting the position of the first support plate (1001), and / or the inner surface of the bottom shell wall (102) is provided with a stopper (13) for limiting the position of the second support plate (1101).

8. The bag dust removal device according to claim 6, characterized in that: A flexible protective pad (12) is provided on the surface of the first support plate (1001) and the second support plate (1101) for contacting the dust removal bag (9).

9. The bag dust removal device according to any one of claims 2 to 5, characterized in that: A mounting structure (6) is provided on the outer surfaces of at least two oppositely disposed lateral shell walls (103).

10. A boiler flue gas desulfurization and denitrification device, characterized in that: It comprises a bag dust removal device as described in any one of claims 1 to 9.

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