Flue gas system

Abstract

The application discloses a flue gas system, wherein the smoke guide device defines a flue; the blind plate is movably arranged on the smoke guide device; the sealing device is arranged between the blind plate and the side wall of the flue along a second direction and comprises a first sealing structure and a second sealing structure, the first sealing structure is arranged on the smoke guide device and located in the flue, and the second sealing structure is arranged on the blind plate; when the blind plate is located in the flue, the blind plate divides the flue and defines a first sub-flue located upstream of the blind plate; along a third direction, the first sealing structure and the second sealing structure are limited and matched and define a throttling channel; along the second direction, at least one of the second sealing structure and the blind plate and the first sealing structure define a dissipation cavity; the throttling channel is communicated with the dissipation cavity and the first sub-flue; and the size of the throttling channel along the third direction is smaller than the size of at least part of the dissipation cavity along the second direction. The flue gas system can form a non-contact sealing between the inner wall of the flue and the blind plate, thereby improving the sealing reliability of the flue gas system.

Description

Technical Field

[0001] This application relates to the field of flue gas treatment equipment technology, and more particularly to a flue gas system. Background Technology

[0002] In the flue gas bypass system of the related technology, a groove is provided in the flue, and the side of the blind plate is movably disposed in the groove, thereby guiding the movement of the blind plate through the groove. A flexible sealing plate is installed on the side of the blind plate. When the blind plate moves to a position completely inside the flue, the flexible sealing plate is squeezed and deformed by the inner wall of the groove, thereby fitting against the inner wall of the groove, and thus enabling the blind plate to seal the flue.

[0003] However, when the blind flange moves, the flexible sealing strip is prone to scratching with structures such as the sliding groove. The flexible sealing strip is made of soft material and is easily deformed or damaged when scratched, which makes it impossible for the blind flange and the flue to form an effective seal, resulting in poor sealing reliability of the flue gas bypass system of related technologies. Summary of the Invention

[0004] The purpose of this application is to at least address the problem of poor sealing reliability in flue gas bypass systems of related technologies. This purpose is achieved through the following means: This application proposes a flue gas system, including: a smoke guide device, a blind flange, and a sealing device. A smoke guiding device defines a flue; a blind plate is movably disposed on the smoke guiding device along a first direction and can enter or exit the flue; a sealing device is located between the blind plate and the sidewall of the flue along a second direction, the sealing device including a first sealing structure and a second sealing structure, the first sealing structure being disposed on the smoke guiding device, at least a portion of the first sealing structure being located within the flue, and the second sealing structure being disposed on the blind plate; wherein, when the blind plate is located within the flue, the blind plate separates the flue and defines a first sub-flue located upstream of the blind plate, along a third direction, the first sealing structure and the second sealing structure are mutually limiting and fit together, defining a throttling channel, along the second direction, at least one of the second sealing structure and the blind plate, together with the first sealing structure, defines a dissipation cavity, the throttling channel connecting the dissipation cavity and the first sub-flue, the dimension of the throttling channel along the third direction being smaller than the dimension of at least a portion of the dissipation cavity along the second direction, the third direction being the thickness direction of the blind plate, and the first direction, the second direction, and the third direction being mutually perpendicular to each other.

[0005] In the flue gas system of this embodiment, when the blind plate is located inside the flue, the throttling channel connects the dissipation chamber and the first sub-flue. By setting the throttling channel, the flow path of the flue gas to the dissipation chamber can be extended, thereby increasing the resistance of the flue gas entering the dissipation chamber, and thus increasing the difficulty of the flue gas passing through the sealing device, thereby improving the sealing effect of the sealing device. When the flue gas enters the throttling channel from the first sub-flue, due to the small size of the throttling channel, the flue gas generates a throttling effect in the throttling channel, the flue gas pressure decreases and the flow velocity increases. That is to say, in the throttling channel, the flue gas pressure can be converted into the kinetic energy of the flue gas. Since the size of the throttling channel along the third direction is designed to be smaller than the size of the dissipation chamber along the second direction, the flow cross-section of the flue gas in the dissipation chamber is larger than the flow cross-section of the flue gas in the throttling channel. When the flue gas enters the dissipation chamber from the throttling channel, the flue gas will generate vortices and turbulence in the dissipation chamber, and a large amount of the kinetic energy of the flue gas will be lost in the dissipation chamber. Therefore, by coordinating the throttling channel and the dissipation cavity, the pressure of the flue gas can be converted into kinetic energy, which is then dissipated through the dissipation cavity. This maximizes the energy dissipation of the flue gas, increasing the difficulty for the flue gas to pass through the sealing device and thus improving its sealing performance. Furthermore, within the throttling channel, the pressure of the flue gas is converted into kinetic energy, resulting in a higher flow velocity when the flue gas enters the dissipation cavity. This increases the degree of vortex and turbulence generated within the dissipation cavity, further enhancing its kinetic energy dissipation effect. Moreover, the throttling channel is defined by the first and second sealing structures along a third direction, while the dissipation cavity is defined by at least one of the second sealing structure and the blind plate along a second direction with the first sealing structure. The flow direction of the flue gas in the throttling channel differs from that in the dissipation cavity. The flue gas needs to change its flow direction when entering the dissipation cavity from the throttling channel, thereby increasing the kinetic energy loss of the flue gas. Furthermore, the dissipation cavity can extend the flow path of the flue gas, thereby increasing the flow resistance of the flue gas and further increasing the difficulty for the flue gas to pass through the sealing device, thus improving the sealing performance of the sealing device. Along a third direction, the first sealing structure and the second sealing structure are mutually limiting and cooperating, enabling non-contact limiting of the movement of the blind plate along the first direction. Along a third direction, the first sealing structure and the second sealing structure are spaced apart. When the blind plate moves along the correct path, there is no contact between the first sealing structure and the second sealing structure; when the movement trajectory of the blind plate deviates, the first sealing structure and the second sealing structure come into contact, thereby limiting and guiding the blind plate and improving the accuracy of the blind plate's movement. In summary, the flue gas system of this application embodiment can form a non-contact seal between the inner wall of the flue and the blind plate, thereby improving the sealing reliability of the flue gas system.

[0006] In some embodiments, the throttling channel includes an inlet, a first throttling segment, and a second throttling segment. The first throttling segment connects the inlet and the second throttling segment. The inlet is connected to the first sub-flue, and the second throttling segment is connected to the dissipation cavity. The orientation direction of the inlet intersects the length direction of the first throttling segment, and the dimension of the first throttling segment along the third direction is greater than the dimension of the second throttling segment along the third direction.

[0007] In some embodiments, the first sealing structure includes a connector and a first seal, the second sealing structure includes a second seal, the connector connects the sidewall of the flue and the first seal, when the blind plate is located within the flue, along the third direction, a portion of the connector is spaced from the second seal and defines the first throttling section, the first seal is spaced from the second seal and defines the second throttling section, the spacing between the connector and the second seal along the third direction is less than the spacing between the first sealing structure and the second seal along the third direction, and along the second direction, the second seal and the sidewall of the flue define the inlet.

[0008] In some embodiments, the first seal includes a throttling portion in a direction away from the first throttling section, the throttling portion being located away from the connector in the third direction, and when the blind plate is located within the flue, the throttling portion and the second seal define the second throttling section, the distance between the throttling portion and the second seal decreasing in a direction away from the first throttling section.

[0009] In some embodiments, the first seal further includes a first dissipation portion and a second dissipation portion, the first dissipation portion connecting the second dissipation portion and the throttling portion, the first dissipation portion moving away from the connector along a direction away from the second seal, the second dissipation portion moving closer to the connector along a second direction, and when the blind plate is located in the flue, at least one of the second sealing structure and the blind plate, the first dissipation portion and the second dissipation portion together define the dissipation cavity.

[0010] In some embodiments, the second sealing structure further includes a third seal. When the blind plate is located within the flue, the second seal and the third seal are located on both sides of the first seal and are mutually restrictive with the first seal along the third direction. The third seal and the first seal define a dissipation channel. When the blind plate is located within the flue, the blind plate separates the flue and defines a second sub-flue located downstream of the blind plate. The dissipation channel connects the dissipation cavity and the second sub-flue.

[0011] In some embodiments, the first seal further includes a guide portion connecting the second dissipation portion and the connector. When the blind plate is located within the flue, the guide portion and the third seal define the dissipation channel. The guide portion approaches the connector in the third direction away from the dissipation cavity.

[0012] In some embodiments, when the blind plate is located within the flue, the third seal defines an outlet along the third direction with the inner wall of the flue, the outlet connecting the dissipation channel and the second sub-flue, and the orientation of the outlet intersects the length direction of the dissipation channel.

[0013] In some embodiments, the interval between the first seal and the second seal is greater than 0 and less than or equal to 10 mm; and / or, the interval between the first seal and the third seal is greater than 0 and less than or equal to 10 mm.

[0014] In some embodiments, the smoke guiding device includes a cover plate, a smoke guiding element, and a mounting bracket. The smoke guiding element defines a connecting hole and the flue. The connecting hole communicates with the flue. The cover plate is movably mounted on the smoke guiding element and is capable of closing or opening the connecting hole. The mounting bracket is mounted on the smoke guiding element. The blind plate is movably mounted on the mounting bracket and is capable of entering or leaving the flue through the connecting hole. Attached Figure Description

[0015] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. Wherein: Figure 1 This is a schematic diagram of a flue gas system according to an embodiment of this application; Figure 2 This is a side view of a flue gas system according to an embodiment of this application, wherein the blind flange is located outside the flue. Figure 3 This is a side view of a flue gas system according to an embodiment of this application, wherein the blind plate is located inside the flue. Figure 4 for Figure 3 Enlarged view of the sealing device in the diagram; Figure 5 for Figure 4 A partial enlarged view of the sealing device; Figure 6 This is a schematic diagram of the smoke guide component according to an embodiment of this application; Figure 7 This is a bottom schematic diagram of the blind plate according to an embodiment of this application.

[0016] The labels in the attached diagram are as follows: 100. Flue gas system; 10. Smoke guiding device; 11. Flue; 111. First sub-flue; 112. Second sub-flue; 12. Cover plate; 13. Smoke guiding component; 131. Connecting hole; 14. Mounting bracket; 15. Sealing component; 20. Blind plate; 21. Card slot; 30. Sealing device; 31. First sealing structure; 311. Connecting member; 312. First sealing element; 3121. Throttling section; 3122. First dissipation section; 3123. Second dissipation section; 3124. Guide section; 32. Second sealing structure; 321. Second sealing element; 322. Third sealing element; 33. Throttling channel; 331. Inlet; 332. First throttling section; 333. Second throttling section; 34. Dissipation chamber; 35. Dissipation channel; 36. Outlet; 40. Drive unit; a) First direction; b) Second direction; c) Third direction. Detailed Implementation

[0017] Exemplary embodiments of this application will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of this application are shown in the drawings, it should be understood that this application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of this application and to fully convey the scope of this application to those skilled in the art.

[0018] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0019] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0020] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure rotates, then an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0021] In the description of the application, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", "height direction", "first direction", "second direction", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0022] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0023] In the flue gas bypass system of the related technology, a groove is provided in the flue, and the side of the blind plate is movably disposed in the groove, thereby guiding the movement of the blind plate through the groove. A flexible sealing plate is installed on the side of the blind plate. When the blind plate moves to a position completely inside the flue, the flexible sealing plate is squeezed and deformed by the inner wall of the groove, thereby fitting against the inner wall of the groove, and thus enabling the blind plate to seal the flue.

[0024] However, when the blind flange moves, the flexible sealing strip is prone to scratching with structures such as the sliding groove. The flexible sealing strip is made of soft material and is easily deformed or damaged when scratched, which makes it impossible for the blind flange and the flue to form an effective seal, resulting in poor sealing reliability of the flue gas bypass system of related technologies.

[0025] Understandably, although the flue gas in a flue gas bypass system has a certain pressure, if the seal is effective, even if there is a small amount of flue gas leakage between the blind flange and the flue, the leaked flue gas is unlikely to flow downstream or will have lost heat by the time it reaches downstream, thus preventing any safety hazard downstream. However, if the blind flange and the flue cannot form an effective seal, it can easily lead to a large amount of flue gas leakage, which can easily cause safety hazards.

[0026] In order to at least address the problem of poor sealing reliability of flue gas bypass systems in related technologies, embodiments of this application propose a flue gas system that enables a non-contact seal between the inner wall of the flue and the blind plate, thereby improving the sealing reliability of the flue gas system.

[0027] The flue gas system 100 of this application is described below with reference to the accompanying drawings.

[0028] Combination Figures 1 to 5As shown, the flue gas system 100 of this application embodiment includes: a smoke guiding device 10, a blind plate 20, and a sealing device 30. The smoke guiding device 10 defines a flue 11; the blind plate 20 is movably disposed on the smoke guiding device 10 along a first direction a and can enter or exit the flue 11; the sealing device 30 is located between the blind plate 20 and the sidewall of the flue 11 along a second direction b, and the sealing device 30 includes a first sealing structure 31 and a second sealing structure 32. The first sealing structure 31 is disposed on the smoke guiding device 10, and at least a portion of the first sealing structure 31 is located within the flue 11. The second sealing structure 32 is disposed on the blind plate 20. When the blind plate 20 is located within the flue 11, the blind plate 20 separates the flue 11 and defines the flue 11 located on the blind plate 20. The first sub-flue 111 of the flue is connected to the first sealing structure 31 and the second sealing structure 32 along the third direction c, which limit the fit between them and define the throttling channel 33. Along the second direction b, at least one of the second sealing structure 32 and the blind plate 20 and the first sealing structure 31 define the dissipation cavity 34. The throttling channel 33 connects the dissipation cavity 34 and the first sub-flue 111. The size of the throttling channel 33 along the third direction c is smaller than the size of at least part of the dissipation cavity 34 along the second direction b. The third direction c is the thickness direction of the blind plate 20. The first direction a, the second direction b and the third direction c are perpendicular to each other.

[0029] Combination Figures 1 to 5 As shown, as an example, the first direction a is the height direction of the blind plate 20, the second direction b is the length direction of the blind plate 20, and the third direction c is the thickness direction of the blind plate 20.

[0030] When the blind flange 20 is located inside the flue 11, the flue 11 is divided, with the upstream region being the first sub-flue 111. A throttling channel 33 is formed between the first sealing structure 31 and the second sealing structure 32 along the third direction c. For example, the first sealing structure 31 may have flat sides, and the second sealing structure 32 may also have flat sides. When the blind flange 20 is located inside the flue 11, the two flat sides are parallel to each other and maintain a certain distance along the third direction c, thus forming the throttling channel 33. Along the second direction b, at least one of the second sealing structure 32 and the blind flange 20, together with the first sealing structure 31, defines a dissipation cavity 34. For example, the first sealing structure 31 may have a groove, while the side of the second sealing structure 32 or the blind flange 20 may be a flat surface. When the blind flange 20 is located inside the flue 11, the flat surface and the inner wall of the groove together define the dissipation cavity 34. The dimension of the throttling channel 33 along the third direction c is designed to be smaller than the dimension of the dissipation cavity 34 along the second direction b. For example, the width of the throttling channel 33 can be several millimeters, while the width of the dissipation cavity 34 can be tens of millimeters.

[0031] When the blind plate 20 is located inside the flue 11, the throttling channel 33 connects the dissipation chamber 34 and the first sub-flue 111. By setting the throttling channel 33, the flow path of the flue gas to the dissipation chamber 34 can be extended, thereby increasing the resistance of the flue gas to enter the dissipation chamber 34, which in turn increases the difficulty of the flue gas passing through the sealing device 30, thereby improving the sealing effect of the sealing device 30.

[0032] Flue gas enters the throttling channel 33 from the first sub-flue 111. Due to the small size of the throttling channel 33, a throttling effect occurs in the throttling channel 33, resulting in a decrease in flue gas pressure and an increase in flow velocity. In other words, within the throttling channel 33, the flue gas pressure can be converted into kinetic energy. Since the dimension of the throttling channel 33 along the third direction c is designed to be smaller than the dimension of the dissipation cavity 34 along the second direction b, the flow cross-section of the flue gas in the dissipation cavity 34 is larger than the flow cross-section of the flue gas in the throttling channel 33. When the flue gas enters the dissipation cavity 34 from the throttling channel 33, vortices and turbulence are generated within the dissipation cavity 34, resulting in a significant loss of kinetic energy.

[0033] Therefore, by working together with the throttling channel 33 and the dissipation chamber 34, the pressure of the flue gas can be converted into kinetic energy and dissipated through the dissipation chamber 34, thereby maximizing the energy consumption of the flue gas and increasing the difficulty for the flue gas to pass through the sealing device 30, thus improving the sealing performance of the sealing device 30.

[0034] Furthermore, within the throttling channel 33, the pressure of the flue gas can be converted into its kinetic energy, resulting in a higher flow velocity when the flue gas enters the dissipation chamber 34. This increases the degree of vortex and turbulence generated within the dissipation chamber 34, thereby enhancing its dissipation effect on the flue gas's kinetic energy. Moreover, the throttling channel 33 is defined by the first sealing structure 31 and the second sealing structure 32 along a third direction c, while the dissipation chamber 34 is defined by at least one of the second sealing structure 32 and the blind plate 20 along a second direction b with the first sealing structure 31. The flow direction of the flue gas in the throttling channel 33 differs from that in the dissipation chamber 34. The flue gas needs to change its flow direction when entering the dissipation chamber 34 from the throttling channel 33, thus increasing the kinetic energy loss of the flue gas. Furthermore, the dissipation chamber 34 can extend the flow path of the flue gas, thereby increasing its flow resistance and further increasing the difficulty for the flue gas to pass through the sealing device 30, thus improving the sealing performance of the sealing device 30.

[0035] Along the third direction c, the first sealing structure 31 and the second sealing structure 32 are mutually limiting and engaging, thereby enabling non-contact limiting of the movement of the blind plate 20 along the first direction a. Along the third direction c, the first sealing structure 31 and the second sealing structure 32 are spaced apart. When the blind plate 20 moves along the correct path, there is no contact between the first sealing structure 31 and the second sealing structure 32. When the movement trajectory of the blind plate 20 deviates, the first sealing structure 31 and the second sealing structure 32 come into contact, thus limiting and guiding the blind plate 20 and improving the accuracy of its movement.

[0036] Understandably, during normal use, the sealing capability of the sealing device 30 does not depend on the contact between the first sealing structure 31 and the second sealing structure 32. Therefore, when the first sealing structure 31 and the second sealing structure 32 collide or rub against each other, the impact on the sealing capability of the sealing device 30 is small, thereby increasing the sealing reliability of the sealing device 30. As a preferred example, both the first sealing structure 31 and the second sealing structure 32 are made of rigid materials.

[0037] Furthermore, when the movement trajectory of the blind plate 20 deviates, causing the first sealing structure 31 and the second sealing structure 32 to come into contact when the blind plate 20 is located in the flue 11, the gap inside the sealing device 30 will be closed, thereby blocking the path of the flue gas through the sealing device 30, and thus the sealing device 30 will still have sealing capability.

[0038] Combination Figure 4 and Figure 5 As shown, in some embodiments, the throttling channel 33 includes an inlet 331, a first throttling section 332 and a second throttling section 333. The first throttling section 332 connects the inlet 331 and the second throttling section 333. The inlet 331 is connected to the first sub-flue 111. The second throttling section 333 is connected to the dissipation cavity 34. The orientation direction of the inlet 331 intersects the length direction of the first throttling section 332. The dimension of the first throttling section 332 along the third direction c is greater than the dimension of the second throttling section 333 along the third direction c.

[0039] Inlet 331 refers to the initial region where flue gas enters the throttling channel 33 from the first sub-flue 111. Its function is to guide the flue gas into the throttling channel 33 and provide space for subsequent flow direction changes. Inlet 331 can be designed as a rectangular, circular, or irregularly shaped opening, and its specific shape and size can be adjusted according to the flue gas flow rate and velocity requirements. The first throttling section 332 refers to the channel section after inlet 331 and before the second throttling section 333. The first throttling section 332 can be a straight channel with a constant cross-section or a channel with a varying cross-section. The second throttling section 333 refers to the channel section after the first throttling section 332 and connected to the dissipation cavity 34. Its main function is to further restrict the flue gas flow, achieving a significant increase in flue gas velocity and a further reduction in pressure, creating conditions for energy dissipation in the dissipation cavity 34. The second throttling section 333 can be a channel with a smaller constant cross-section or a channel with a further contracted cross-section.

[0040] The first throttling section 332 connects to the inlet 331 and the second throttling section 333. The flue gas can pass sequentially through the inlet 331, the first throttling section 332, and the second throttling section 333, allowing the flue gas to undergo multi-stage throttling and flow pattern adjustment before entering the dissipation chamber 34, thus achieving precise control of the flue gas flow. The inlet 331 connects to the first sub-flue 111, enabling the flue gas within the first sub-flue 111 to be effectively introduced into the throttling channel 33. The inlet 331 can be directly connected to the first sub-flue 111 or connected through a transition area. The second throttling section 333 connects to the dissipation chamber 34, allowing the flue gas, after undergoing multi-stage throttling, to enter the dissipation chamber 34 for energy dissipation.

[0041] The orientation of inlet 331 intersects the length direction of the first sluice section 332, causing a change in the flow direction of the flue gas as it enters the first sluice section 332 from the first sub-flue 111. For example, inlet 331 can be positioned perpendicular to the length direction of the first sluice section 332, requiring the flue gas to make a 90-degree turn upon entering; or inlet 331 can intersect the length direction of the first sluice section 332 at a certain acute or obtuse angle, causing the flue gas to make an oblique turn. This alters the flue gas flow direction and reduces its kinetic energy.

[0042] The dimension of the first throttling section 332 along the third direction c is larger than the dimension of the second throttling section 333 along the third direction c. This means that when the flue gas enters the second throttling section 333 from the first throttling section 332, the flow cross section of the flue gas will be reduced. This allows the second throttling section 333 to produce a throttling effect on the flue gas, further accelerating the flow of the flue gas and converting the pressure energy of the flue gas into kinetic energy, thereby achieving more efficient energy dissipation in the dissipation cavity 34.

[0043] The throttling channel 33 of this application includes an inlet 331, a first throttling section 332, and a second throttling section 333. The orientation of the inlet 331 intersects the length direction of the first throttling section 332, forcing a change in the flow direction of the flue gas when it enters the throttling channel 33 from the first sub-flue 111, thereby effectively reducing the initial kinetic energy of the flue gas. The dimension of the first throttling section 332 along the third direction c is larger than that of the second throttling section 333 along the third direction c, causing the flow cross-section to contract and the flue gas velocity to increase when the flue gas flows through the throttling channel 33. Pressure energy is converted into kinetic energy, ensuring that the kinetic energy of the flue gas is fully converted and prepared before entering the dissipation chamber 34, thereby enabling more efficient energy dissipation in the dissipation chamber 34.

[0044] Combination Figure 4 and Figure 5 As shown, in some embodiments, the first sealing structure 31 includes a connector 311 and a first seal 312, and the second sealing structure 32 includes a second seal 321. The connector 311 connects the sidewall of the flue 11 and the first seal 312. When the blind plate 20 is located inside the flue 11, along the third direction c, part of the connector 311 is spaced from the second seal 321 and defines a first throttling section 332. The first seal 312 is spaced from the second seal 321 and defines a second throttling section 333. The distance between the connector 311 and the second seal 321 along the third direction c is smaller than the distance between the first seal 312 and the second seal 321 along the third direction c. Along the second direction b, the second seal 321 and the sidewall of the flue 11 define an inlet 331.

[0045] The connector 311 mounts the first seal 312 onto the side wall of the flue 11, thereby providing a stable mounting base and improving the stability of the first seal 312. The connector 311 can take various forms; for example, it can be a fixed bracket welded to the side wall of the flue 11, or a structural component detachably mounted to the side wall of the flue 11 by bolts or other fasteners. Furthermore, the connector 311 can be designed with a certain degree of elasticity or adjustability to accommodate installation errors or thermal expansion and contraction.

[0046] The first sealing element 312 cooperates with the second sealing structure 32 to jointly define the throttling channel 33 and the dissipation cavity 34, thereby achieving effective sealing of the flue gas. The material of the first sealing element 312 is usually selected as a high-temperature resistant and corrosion-resistant material, and its shape and size are designed according to the specific sealing requirements and the structure of the flue 11. For example, it can be a strip, block, or irregular structure.

[0047] The second seal 321 cooperates with the first sealing structure 31 to form a throttling channel 33 and a dissipation chamber 34, thereby achieving effective sealing of the flue gas. The second seal 321 is typically installed on the blind flange 20 and moves with the blind flange 20. Its material also needs to be heat-resistant and corrosion-resistant; for example, it can be made of a material similar to the first seal 312, or a more wear-resistant material, such as a polymer composite material or metal alloy, can be selected based on the movement characteristics and sealing requirements of the blind flange 20. The structure of the second seal 321 can be a protrusion, a groove, or a sealing strip with a specific cross-sectional shape.

[0048] The connection between the connector 311 and the side wall of the flue 11 can be achieved through welding, bolting, riveting, etc., to ensure the reliability of the connector 311 under high temperature, high pressure, or vibration environments. Similarly, the connection between the connector 311 and the first seal 312 can be achieved through mechanical fixing (such as bolts, clips) or bonding, ensuring that the first seal 312 can be accurately positioned and withstand flue gas pressure. For example, the connector 311 can be an integrally molded bracket, directly molded or bonded to the first seal 312; or the connector 311 can be a separate metal part, with the first seal 312 fixed to it by bolts, and then the metal part fixed to the side wall of the flue 11.

[0049] When the blind flange 20 is fully inserted into the flue 11 and in the sealed position, a first throttling section 332 is formed between a portion of the connector 311 and the second seal 321. For example, the connector 311 can be designed to have a flange extending into the flue 11, and when the blind flange 20 enters the flue 11, the side of the flange forms a gap with the corresponding side of the second seal 321; or the second seal 321 can be designed to have a groove that mates with the connector 311, forming a preset throttling gap between them.

[0050] Following the first throttling section 332, a second throttling section 333 is formed between the first seal 312 and the second seal 321. The second throttling section 333 throttles the flue gas passing through the first throttling section 332, reducing flue gas pressure and improving the sealing effect. For example, the first seal 312 can be designed with protrusions or grooves corresponding to the second seal 321, forming a precisely controlled gap between them when the blind flange 20 is in place; or they can be designed with a nested structure, forming the second throttling section 333 through the minute gap between their mating surfaces.

[0051] The distance between the connector 311 and the second seal 321 along the third direction c is less than the distance between the sealing structure and the second seal 321 along the third direction c, so that the size of the throttling channel 33 along the third direction c is less than the size of at least part of the dissipation cavity 34 along the second direction b.

[0052] When the blind flange 20 is located inside the flue 11, an inlet 331 of the throttling channel 33 is formed between the second seal 321 and the side wall of the flue 11. This inlet 331 allows flue gas to enter the throttling channel 33 from the first sub-flue 111. For example, the second seal 321 can be designed with a predetermined gap between it and the side wall of the flue 11, which serves as the inlet 331; or a structure that cooperates with the second seal 321 can be provided on the side wall of the flue 11 to jointly form the inlet 331.

[0053] In the embodiments of this application, when the blind flange 20 is located within the flue 11, a first throttling section 332 can be defined along a third direction c by utilizing the gap between the partial connector 311 and the second seal 321, while a second throttling section 333 can be defined by utilizing the gap between the first seal 312 and the second seal 321. This not only provides the necessary clearance during the movement of the blind flange 20, but also achieves a highly efficient sealing effect when the blind flange 20 is located within the flue 11.

[0054] In the flue gas bypass system of the relevant technology, when the blind plate is located outside the flue, the slide groove in the flue will cause a large obstruction to the flue gas, resulting in a dead zone near the slide groove, which is not conducive to the flow of flue gas.

[0055] In order to at least reduce the obstruction to flue gas, combined with Figure 4 and Figure 5 As shown, in some embodiments, the first seal 312 includes a throttling portion 3121. In a direction away from the first throttling section 332, the throttling portion 3121 moves away from the connector 311 in a third direction c. When the blind plate 20 is located in the flue 11, the throttling portion 3121 and the second seal 321 define a second throttling section 333. In a direction away from the first throttling section 332, the distance between the throttling portion 3121 and the second seal 321 decreases.

[0056] The throttling section 3121 controls the flow velocity and pressure of the flue gas as it passes through the second throttling section 333 to achieve an effective throttling effect. The throttling section 3121 can be designed as a protrusion or groove formed on the body of the first seal 312 through machining. Its shape can be arc-shaped, wedge-shaped, conical, or stepped to achieve a gradually changing flow channel cross-section. Alternatively, the throttling section 3121 can be an independent component attached to the body of the first seal 312, for example, fixed by welding, bolting, or snap-fitting. This component has a specific geometry, such as a slope, arc surface, or gradually curved surface, to cooperate with the second seal 321 to form the desired throttling effect.

[0057] When the blind flange 20 is located inside the flue 11, the throttling part 3121 and the second seal 321 together define the second throttling section 333. As an example, the throttling part 3121 can be a structure with a slope or arc surface, which, together with the straight or curved surface of the second seal 321, forms a second throttling section 333 with a gradually changing cross section.

[0058] Along the direction away from the first throttling section 332, the throttling portion 3121 moves away from the connector 311 in the third direction c. The position of the throttling portion 3121 in the third direction c gradually deviates from the connector 311, providing a structural basis for forming a tapered flow channel. For example, the throttling portion 3121 can be a ramp-shaped structure, with the end of the throttling portion 3121 closer to the connector 311 in the third direction c, while the end away from the first throttling section 332 gradually moves away from the connector 311 in the third direction c. Alternatively, the throttling portion 3121 can have a stepped profile, with its position in the third direction c abruptly changing in the transition region from the first throttling section 332 to the second throttling section 333, thus moving away from the connector 311.

[0059] The reduced gap between the throttling section 3121 and the second seal 321 creates a narrowing flow channel, increasing the flow velocity and decreasing the pressure of the flue gas as it passes through the second throttling section 333, thus producing a throttling effect. For example, the throttling section 3121 can be designed as a conical or wedge-shaped structure, with its mating surface with the second seal 321 being inclined, so that the distance between them gradually decreases along the flue gas flow direction. Alternatively, the corresponding surface of the second seal 321 can also be designed as an inclined or curved surface that mates with the throttling section 3121, together achieving a gradual reduction in the gap.

[0060] In the embodiments of this application, by moving the throttling section 3121 away from the connector 311 in a third direction c away from the first throttling section 332, and at the same time gradually reducing the gap between the throttling section 3121 and the second seal 321, the flue gas can be effectively guided to undergo controlled pressure changes before entering the dissipation chamber 34. The fluid velocity is forced to change through the gradually narrowing channel, thereby generating a throttling effect in the second throttling section 333.

[0061] When the blind plate 20 is located outside the flue 11, the throttling part 3121 moves away from the connector 311 along the third direction c. Therefore, the throttling part 3121 can guide the flue gas out of the position of the connector 311, thereby reducing the obstruction effect of the first sealing structure 31 on the flue gas and optimizing the flue gas passage performance of the flue gas system 100 in the non-sealed state.

[0062] In the flue gas bypass system of the relevant technology, when the blind plate is located outside the flue, the sliding groove inside the flue will cause a significant obstruction to the flue gas, thus greatly hindering the flow of the flue gas.

[0063] In order to at least reduce the obstruction to the flow of flue gas, combined with Figure 4 and Figure 5 As shown, in some embodiments, the first seal 312 further includes a first dissipation portion 3122 and a second dissipation portion 3123. The first dissipation portion 3122 connects the second dissipation portion 3123 and the throttling portion 3121. Along the direction away from the second seal 321, the first dissipation portion 3122 moves away from the connector 311 along the second direction b, and the second dissipation portion 3123 moves closer to the connector 311 along the second direction b. When the blind plate 20 is located in the flue 11, at least one of the second sealing structure 32 and the blind plate 20, the first dissipation portion 3122 and the second dissipation portion 3123 together define a dissipation cavity 34.

[0064] The first dissipation part 3122 and the second dissipation part 3123 jointly participate in the formation of the dissipation cavity 34. The first dissipation part 3122 and the second dissipation part 3123 can adopt various structural forms, such as a plane with a specific tilt angle, an arc surface, a stepped structure, or a complex geometric body composed of multiple small units.

[0065] The first dissipation section 3122 and the second dissipation section 3123 can guide the flow path of the flue gas. The first dissipation section 3122, the second dissipation section 3123 and the throttling section 3121 form a structural connection, which enables the flue gas to smoothly transition from the throttling section 3121 to the dissipation chamber 34 and dissipate energy in the dissipation chamber 34.

[0066] In the embodiments of this application, when the blind plate 20 is located outside the flue 11, the structure in which the first dissipation part 3122 moves away from the connector 311 along the second direction b, and the second dissipation part 3123 moves closer to the connector 311 along the second direction b, can guide the flue gas to flow smoothly through the first seal 312, thereby guiding the flue gas and allowing it to pass more smoothly through the first sealing structure 31, reducing the resistance to flue gas flow. Furthermore, the first dissipation part 3122 connects the second dissipation part 3123 and the throttling part 3121, enabling the first and second dissipation parts 3122 and 3123 to receive the flue gas flowing out of the throttling part 3121, further reducing the obstruction effect of the connector 311 on the flue gas and ensuring the smoothness of flue gas flow.

[0067] Furthermore, along the direction away from the second seal 321, the first dissipation part 3122 moves away from the connector 311 along the second direction b, and the second dissipation part 3123 moves closer to the connector 311 along the second direction b. At least one of the second sealing structure 32 and the blind plate 20, the first dissipation part 3122 and the second dissipation part 3123 together define the dissipation cavity 34. Therefore, the first dissipation part 3122 and the second dissipation part 3123 can also extend the flow path of the flue gas in the dissipation cavity 34, thereby increasing the loss of kinetic energy of the flue gas and improving the sealing performance of the sealing device 30.

[0068] Combination Figure 4 and Figure 5 As shown, in some embodiments, the second sealing structure 32 further includes a third sealing element 322. When the blind plate 20 is located inside the flue 11, along the third direction c, the second sealing element 321 and the third sealing element 322 are located on both sides of the first sealing element 312 and are mutually restrictive with the first sealing element 312. The third sealing element 322 and the first sealing element 312 define a dissipation channel 35. When the blind plate 20 is located inside the flue 11, the blind plate 20 separates the flue 11 and defines a second sub-flue 112 located downstream of the blind plate 20. The dissipation channel 35 connects the dissipation cavity 34 and the second sub-flue 112.

[0069] Along the third direction c, the second seal 321 and the third seal 322 are located on both sides of the first seal 312 and engage with the first seal 312 in a limiting fit. This increases the limiting and guiding capability of the blind flange 20, making its movement more accurate. As an example, the limiting fit can be achieved by providing a protrusion on the side of the first seal 312 and grooves at corresponding positions of the second seal 321 and the third seal 322, allowing the protrusion to embed into the groove, forming a mechanical lock. Alternatively, it can be achieved by precisely controlling the gap between the second seal 321, the third seal 322, and the first seal 312, such that the gap is small enough when the blind flange 20 is in the sealed position to provide support and restraint, while still allowing the blind flange 20 to pass smoothly during movement.

[0070] The third seal 322 and the first seal 312 define a dissipation channel 35. The dissipation channel 35 increases the flow path of the flue gas, thereby increasing the resistance of the flue gas through the sealing device 30 and thus improving the sealing capability of the sealing device 30. The dissipation channel 35 can be formed by the specific geometry of the third seal 322 and the first seal 312. For example, a narrow gap can be formed between the inner surface of the third seal 322 and the outer surface of the first seal 312, which constitutes the dissipation channel 35. Alternatively, pre-designed grooves or holes can be machined into the third seal 322 or the first seal 312, and when the two are fitted together, these grooves or holes collectively form the dissipation channel 35.

[0071] In the embodiments of this application, by providing a third sealing element 322 and positioning it and the second sealing element 321 together on both sides of the first sealing element 312, a double-limiting fit is formed on the first sealing element 312. This enhances the structural stability of the first sealing element 312 during the operation of the flue gas system 100, effectively resisting displacement or deformation that may be caused by flue gas pressure fluctuations. The dissipation channel 35 defined between the third sealing element 322 and the first sealing element 312 increases the flow path of the flue gas, thereby increasing the resistance of the flue gas passing through the sealing device 30 and improving the sealing capability of the sealing device 30. Therefore, the flue gas system 100 of this application can achieve a more stable and efficient seal when the blind plate 20 separates the flue duct 11.

[0072] Combination Figure 4 and Figure 5 As shown, in some embodiments, the first seal 312 further includes a guide portion 3124, which connects the second dissipation portion 3123 and the connector 311. When the blind plate 20 is located in the flue 11, the guide portion 3124 and the third seal 322 define a dissipation channel 35. Along the direction away from the dissipation cavity 34, the guide portion 3124 approaches the connector 311 in the third direction c.

[0073] The first seal 312 also includes a guide portion 3124. The guide portion 3124 can guide the direction of flue gas flow. For example, the guide portion 3124 can be designed as a plane or curved surface with a specific inclination angle, such as an inclined surface, whose inclination angle can effectively guide the airflow from the dissipation chamber 34 to the dissipation channel 35. Alternatively, the guide portion 3124 can also be a transition structure with a certain curvature, such as an arc surface or a parabolic surface, to achieve smooth airflow deflection and reduce airflow impact and energy loss.

[0074] The guide portion 3124 connects the second dissipation portion 3123 and the connector 311. As an example, the guide portion 3124 can be integrally formed with the second dissipation portion 3123 and the connector 311, for example, by casting, injection molding, or 3D printing, to form a continuous integral structure, thereby enhancing the structural integrity and sealing performance. Alternatively, the guide portion 3124 can also be fixed to the second dissipation portion and the connector 311 respectively by welding, bolting, or snap-fit ​​connection. For example, the guide portion 3124 can be a separate component, fixed between the second dissipation portion 3123 and the connector 311 by a mechanical connector 311.

[0075] When the blind flange 20 is located inside the flue 11, the guide portion 3124 and the third seal 322 define the dissipation channel 35. The cooperation between the guide portion 3124 and the third seal 322 together constitutes the dissipation channel 35.

[0076] Along the direction away from the dissipation cavity 34, the guide portion 3124 approaches the connector 311 in the third direction c. For example, the guide portion 3124 can be designed as a plane with a certain slope, the slope of which causes the distance between the guide portion 3124 and the connector 311 to gradually decrease in the direction away from the dissipation cavity 34, thereby forming a converging channel portion. Alternatively, the guide portion 3124 can also be designed as a curved surface with a specific curvature, such as a concave arc surface, so that the airflow can be smoothly guided and gradually approach the connector 311 when passing through this area, thereby generating an interaction between the airflow and the connector 311 or the sidewall of the flue 11.

[0077] In an embodiment of this application, a guide portion 3124 is added to the first seal 312, which, together with the third seal 322, defines a dissipation channel 35. The flue gas flowing out of the dissipation cavity 34 is guided by the guide portion 3124. Since the guide portion 3124 approaches the connector 311 along a third direction c, away from the dissipation cavity 34, it guides the flue gas to the connector 311, thereby bringing the flue gas into contact with the connector 311 and dissipating its kinetic energy. By actively guiding the airflow and dissipating its kinetic energy through the guide portion 3124, the difficulty of the flue gas passing through the sealing device 30 is increased, thereby enhancing the sealing performance of the sealing device 30.

[0078] Combination Figure 4 and Figure 5 As shown, in some embodiments, when the blind plate 20 is located inside the flue 11, along the third direction c, the third seal 322 and the inner wall of the flue 11 define an outlet 36, which connects to the dissipation channel 35 and the second sub-flue 112, and the orientation of the outlet 36 intersects the length direction of the dissipation channel 35.

[0079] The third seal 322, as part of the second sealing structure 32, works together with the inner wall of the flue 11 to define the outlet 36 for flue gas outflow. The third seal 322 can be a rigid or semi-rigid component with a specific geometry, such as a plate or block structure made of high-temperature alloy or ceramic material, with its surface precision-machined to ensure a precise gap with the inner wall of the flue 11. Alternatively, the third seal 322 can be made of a high-temperature resistant material with a certain degree of elasticity, such as flexible graphite or special rubber, which deforms to fit tightly against the inner wall of the flue 11, thereby defining a stable outlet 36. The inner wall of the flue 11 is typically made of high-temperature resistant metal or refractory material, and its surface can be smooth or designed with a specific contour to match the third seal 322 and form the desired outlet 36 shape.

[0080] Outlet 36 is a structure that allows flue gas to flow from dissipation channel 35 to the second sub-flue 112. Outlet 36 can be a slit with a constant width to ensure uniform flue gas flow; it can also be designed as a nozzle-like or diffuser-like structure with a width that gradually varies along the second direction b to achieve fine regulation of flue gas velocity and pressure. In addition, outlet 36 can also consist of a series of discrete holes or slots, rather than a continuous slit.

[0081] The connection between outlet 36 and dissipation channel 35 and second sub-flue 112 means that the starting end of outlet 36 is directly connected to the end of dissipation channel 35, while the terminating end of outlet 36 directly faces the second sub-flue 112, forming a smooth fluid path. The orientation of outlet 36 refers to the main flow direction of flue gas when it leaves outlet 36, while the length direction of dissipation channel 35 is the direction in which flue gas flows along its main axis within dissipation channel 35. The intersection of the orientation of outlet 36 and the length direction of dissipation channel 35 means that the flow direction of flue gas changes when it leaves dissipation channel 35 and enters the second sub-flue 112. The intersection can be perpendicular, i.e., the orientation of outlet 36 and the length direction of dissipation channel 35 form a 90-degree angle, causing the flue gas to turn sharply; or it can be oblique, i.e., the two form an acute or obtuse angle, achieving a smooth or gradual change in flue gas flow. For example, outlet 36 can be designed as an angled nozzle to guide flue gas to a specific area within the second sub-flue 112, or to form an angle with the main airflow direction within the second sub-flue 112.

[0082] In the embodiments of this application, the orientation of the outlet 36 intersects with the length direction of the dissipation channel 35, so that when the flue gas leaves the dissipation channel 35 and enters the second sub-flue 112, the flue gas flow direction is deflected or changed, thereby increasing the difficulty for the flue gas to pass through the sealing device 30, and thus increasing the sealing performance of the sealing device 30.

[0083] Combination Figure 4 and Figure 5 As shown, in some preferred embodiments, the main body of the first seal 312 is cylindrical.

[0084] The cylindrical first seal 312 can have the geometric features of the throttling part 3121, the first dissipation part 3122, the second dissipation part 3123 and the guide part 3124. Moreover, the cylindrical first seal 312 has a simple shape and mature processing technology, which can reduce the processing difficulty of the first seal 312 and make it easier to control the size and tolerance of the first seal 312, thereby making it easier to control the sealing performance of the sealing device 30.

[0085] Combination Figure 4 and Figure 5 As shown, in some preferred embodiments, the second seal 321 is an angle iron piece.

[0086] Angle iron is a finished profile. Using angle iron to prepare the second sealing element 321 can reduce the processing difficulty of the second sealing element 321, make it easier to control the size and tolerance of the second sealing element 321, and thus make the sealing performance of the sealing device 30 easier to control.

[0087] Combination Figure 4 and Figure 5 As shown, in some preferred embodiments, the third seal 322 is an angle iron piece.

[0088] Angle iron is a finished profile. Using angle iron to prepare the third sealing element 322 can reduce the processing difficulty of the third sealing element 322, and make it easier to control the size and tolerance of the third sealing element 322, thereby making it easier to control the sealing performance of the sealing device 30.

[0089] In some embodiments, the gap between the first seal 312 and the second seal 321 is greater than 0 and less than or equal to 10 mm.

[0090] As an example, the interval between the first seal 312 and the second seal 321 can be 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, or 10mm.

[0091] The gap between the first seal 312 and the second seal 321 is greater than 0 and less than or equal to 10 mm. This gap refers to the minimum distance along the third direction c between the first seal 312 and the second seal 321 when the blind plate 20 is located inside the flue 11 and cooperates with the sealing device 30. The gap between the first seal 312 and the second seal 321 can precisely control the hydrodynamic characteristics of the flue gas flow through the throttling channel 33. For example, this gap can be finely adjusted by setting precision shims or adjusting bolts at the installation positions of the first seal 312 or the second seal 321 to ensure that the preset dimensional accuracy is achieved during assembly. In addition, the contact surfaces of the first seal 312 and the second seal 321 can also be machined with high precision, such as by CNC milling or grinding, to ensure that their clearance is within a limited range when they are mated.

[0092] In this embodiment, the gap between the first seal 312 and the second seal 321 is controlled within the range of 0 to 10 mm, so that the geometry of the throttling channel 33 is within the optimal range. This effectively limits the flow rate of flue gas through the throttling channel 33, avoiding seal failure due to excessive gap, and also prevents the blind plate 20 from being obstructed due to insufficient gap. This ensures a stable limiting fit between the first seal 312 and the second seal 321. Furthermore, through precise control of the physical space, the sealing device 30 has good sealing capability, thus maintaining a good sealing state in the flue gas system 100 and enabling the blind plate 20 to move efficiently and smoothly.

[0093] In some embodiments, the gap between the first seal 312 and the third seal 322 is greater than 0 and less than or equal to 10 mm.

[0094] As an example, the interval between the first seal 312 and the third seal 322 can be 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, or 10mm.

[0095] The gap between the first seal 312 and the third seal 322 is greater than 0 and less than or equal to 10 mm. This gap refers to the minimum distance along the third direction c between the first seal 312 and the third seal 322 when the blind plate 20 is located inside the flue 11 and cooperates with the sealing device 30. The gap between the first seal 312 and the third seal 322 can precisely control the hydrodynamic characteristics of the flue gas flow through the throttling channel 33. For example, this gap can be finely adjusted by setting precision shims or adjusting bolts at the installation positions of the first seal 312 and the third seal 322 to ensure that the preset dimensional accuracy is achieved during assembly. In addition, the contact surfaces of the first seal 312 and the third seal 322 can also be machined with high precision, such as by CNC milling or grinding, to ensure that their clearance is within a limited range when they are in contact.

[0096] In this embodiment, the gap between the first seal 312 and the third seal 322 is controlled within the range of 0 to 10 mm, so that the geometry of the dissipation channel 35 is in the optimal range. This effectively limits the flow rate of flue gas through the dissipation channel 35, avoiding seal failure due to excessive gap, and also prevents the blind plate 20 from being obstructed due to insufficient gap. This ensures a stable limiting fit between the first seal 312 and the second seal 321. Furthermore, through precise control of the physical space, the sealing device 30 has good sealing capability, thus maintaining a good sealing state in the flue gas system 100 and enabling the blind plate 20 to move efficiently and smoothly.

[0097] Combination Figure 1 , Figure 2 , Figure 3 and Figure 6 As shown, in some embodiments, the smoke guiding device 10 includes a cover plate 12, a smoke guiding element 13, and a mounting bracket 14. The smoke guiding element 13 defines a connecting hole 131 and a flue 11. The connecting hole 131 communicates with the flue 11. The cover plate 12 is movably mounted on the smoke guiding element 13 and can close or open the connecting hole 131. The mounting bracket 14 is mounted on the smoke guiding element 13. The blind plate 20 is movably mounted on the mounting bracket 14 and can enter or leave the flue 11 through the connecting hole 131.

[0098] The smoke guide 13 is used to construct and guide the path of flue gas flow. It can be manufactured by casting, welding, or integral molding. The material of the smoke guide 13 is usually a high-temperature resistant and corrosion-resistant metal, such as stainless steel or special alloy. The interior of the smoke guide 13 allows flue gas to pass smoothly and provides the necessary space for the movement of the blind plate 20. The connecting hole 131 is an opening reserved on the smoke guide 13 for the blind plate 20 to enter and exit the flue duct 11. The size and shape of the connecting hole 131 must match the geometry of the blind plate 20 to ensure that the blind plate 20 can pass through without obstruction. The edges of the connecting hole 131 can be chamfered or rounded to reduce friction and wear during the movement of the blind plate 20. The flue duct 11 is the channel for flue gas flow. Its cross-sectional shape can be circular, square, or rectangular, depending on the design requirements and space constraints of the flue gas system 100. The inner wall of the flue duct 11 is usually required to be smooth to reduce the resistance to flue gas flow.

[0099] The cover plate 12 can seal the connecting hole 131 when the blind plate 20 is not inside the flue 11, preventing smoke leakage or external environmental impact on the interior of the flue 11. The cover plate 12 can be opened and closed using various motion methods. For example, it can be designed as a sliding cover plate 12, sliding horizontally on the smoke guide 13 via a guide rail; or it can be designed as a rotating cover plate 12, opening and closing by rotating on the smoke guide 13 via a hinge or pivot. A flexible sealing gasket or mechanical seal structure can be provided between the cover plate 12 and the smoke guide 13 to ensure sealing when closed. The motion mechanism of the cover plate 12 can include, but is not limited to: a guide rail and slider working together to achieve linear reciprocating motion; or a pivot and linkage mechanism to achieve rotational or oscillating motion. The driving method can be manual operation, or electric, pneumatic, or hydraulic drive, using an actuator (such as a motor or cylinder) to move the cover plate 12.

[0100] Mounting bracket 14 is a structural component used to support and guide the movement of blind flange 20. Mounting bracket 14 can be securely fixed to the exterior or interior of smoke guide 13 by means of bolting, welding, or riveting. The structure of mounting bracket 14 should have sufficient rigidity and strength to withstand the load during the movement of blind flange 20 and ensure the stability of the movement trajectory of blind flange 20. The connection method between mounting bracket 14 and smoke guide 13 can be varied. For example, mounting bracket 14 can be a frame structure, bolted to the side wall of smoke guide 13 via flanges; or, mounting bracket 14 can be directly welded to the outer surface of smoke guide 13.

[0101] The blind flange 20 and the mounting frame 14 can be connected by a motion mechanism, allowing the blind flange 20 to perform precise linear or curved movements under the guidance of the mounting frame 14. For example, the mounting frame 14 can integrate a guide rail, and the blind flange 20 can be equipped with a corresponding slider, which slides in the guide rail to achieve movement; or, the mounting frame 14 can be equipped with rollers or bearings, and the blind flange 20 can be supported and guided by these components, thereby improving the stability and positioning accuracy of the blind flange 20 during movement. Driven by the mounting frame 14, the blind flange 20 follows a preset trajectory, passes through the connecting hole 131 on the smoke guide 13, and thus enters the flue 11 to cut off the smoke, or withdraws from the flue 11.

[0102] In this embodiment, the blind flange 20 is physically connected to the flue 11 via the connecting hole 131, providing a passage for its entry and exit. The cover plate 12 controls the opening and closing of the connecting hole 131, effectively isolating the external environment and preventing flue gas leakage when the blind flange 20 is not in operation. The mounting bracket 14 serves as the support and movement carrier for the blind flange 20. By mounting it on the smoke guide 13, it ensures that the movement trajectory of the blind flange 20 during its entry into the flue 11 has extremely high stability and consistency. This allows the blind flange 20 to accurately enter the interior of the flue 11 through the connecting hole 131, thereby cooperating with the sealing device 30 to achieve an effective seal.

[0103] Combination Figure 1 , Figure 2 , Figure 3 and Figure 6 As shown, in some specific embodiments, the flue gas system 100 further includes a drive device 40, which is mounted on the mounting bracket 14 and is connected to the blind plate 20 in a transmission manner.

[0104] The blind plate 20 can be driven to move by the drive device 40, thereby reducing the difficulty of driving the blind plate 20 to move and making the movement of the blind plate 20 simpler and more controllable.

[0105] As an example, the drive unit 40 can be a traction machine or a winch.

[0106] like Figure 7 As shown, in some specific embodiments, the bottom of the blind plate 20 is provided with a slot 21, and the smoke guiding device 10 also includes a sealing member 15. The sealing member 15 is installed on the bottom wall of the flue 11 and located inside the flue 11. When the blind plate 20 is located inside the flue 11, at least part of the sealing member 15 is engaged with the slot 21.

[0107] The gap between the bottom of the blind flange 20 and the inner wall of the flue 11 can be sealed by the closure 15 and the slot 21, thereby increasing the sealing ability of the blind flange 20.

[0108] As an example, the closure 15 is made of angle iron or angle steel. Angle iron and angle steel are finished profiles. Using angle iron or angle steel to prepare the closure 15 can reduce the processing difficulty of the closure 15 and make it easier to control the size and tolerance of the closure 15.

[0109] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A flue gas system, characterized in that, include: Smoke guiding device, limiting the smoke outlet; A blind plate is movably disposed on the smoke guiding device along a first direction and is able to enter or exit the smoke duct; A sealing device is located between the blind plate and the side wall of the flue along a second direction. The sealing device includes a first sealing structure and a second sealing structure. The first sealing structure is disposed in the smoke guiding device, and at least a portion of the first sealing structure is located inside the flue. The second sealing structure is disposed in the blind plate. Wherein, when the blind plate is located within the flue, the blind plate separates the flue and defines a first sub-flue located upstream of the blind plate. Along a third direction, the first sealing structure and the second sealing structure are mutually limiting and fit together, defining a throttling channel. Along a second direction, at least one of the second sealing structure and the blind plate, together with the first sealing structure, defines a dissipation cavity. The throttling channel connects the dissipation cavity and the first sub-flue. The dimension of the throttling channel along the third direction is smaller than at least a portion of the dimension of the dissipation cavity along the second direction. The third direction is the thickness direction of the blind plate. The first direction, the second direction, and the third direction are mutually perpendicular to each other.

2. The flue gas system according to claim 1, characterized in that, The throttling channel includes an inlet, a first throttling section, and a second throttling section. The first throttling section connects the inlet and the second throttling section. The inlet is connected to the first sub-flue, and the second throttling section is connected to the dissipation cavity. The orientation of the inlet intersects the length direction of the first throttling section. The dimension of the first throttling section along the third direction is greater than the dimension of the second throttling section along the third direction.

3. The flue gas system according to claim 2, characterized in that, The first sealing structure includes a connector and a first seal, and the second sealing structure includes a second seal. The connector connects the sidewall of the flue and the first seal. When the blind plate is located in the flue, along the third direction, a portion of the connector is spaced from the second seal and defines the first throttling section. The first seal is spaced from the second seal and defines the second throttling section. The distance between the connector and the second seal along the third direction is less than the distance between the first sealing structure and the second seal along the third direction. Along the second direction, the second seal and the sidewall of the flue define the inlet.

4. The flue gas system according to claim 3, characterized in that, The first seal includes a throttling portion. In a direction away from the first throttling section, the throttling portion moves away from the connector in the third direction. When the blind plate is located in the flue, the throttling portion and the second seal define the second throttling section. In a direction away from the first throttling section, the distance between the throttling portion and the second seal decreases.

5. The flue gas system according to claim 4, characterized in that, The first seal further includes a first dissipation portion and a second dissipation portion. The first dissipation portion connects the second dissipation portion and the throttling portion. Along the direction away from the second seal, the first dissipation portion moves away from the connector along the second direction, and the second dissipation portion moves closer to the connector along the second direction. When the blind plate is located in the flue, at least one of the second sealing structure and the blind plate, the first dissipation portion and the second dissipation portion together define the dissipation cavity.

6. The flue gas system according to claim 5, characterized in that, The second sealing structure further includes a third sealing element. When the blind plate is located in the flue, along the third direction, the second sealing element and the third sealing element are located on both sides of the first sealing element and are mutually restrictive with the first sealing element. The third sealing element and the first sealing element define a dissipation channel. When the blind plate is located in the flue, the blind plate separates the flue and defines a second sub-flue located downstream of the blind plate. The dissipation channel connects the dissipation cavity and the second sub-flue.

7. The flue gas system according to claim 6, characterized in that, The first seal further includes a guide portion, which connects the second dissipation portion and the connector. When the blind plate is located in the flue, the guide portion and the third seal define the dissipation channel. Along the direction away from the dissipation cavity, the guide portion approaches the connector in the third direction.

8. The flue gas system according to claim 7, characterized in that, When the blind plate is located inside the flue, along the third direction, the third seal and the inner wall of the flue define an outlet, the outlet connects the dissipation channel and the second sub-flue, and the orientation of the outlet intersects the length direction of the dissipation channel.

9. The flue gas system according to claim 6, characterized in that, Along the third direction, the distance between the first seal and the second seal is greater than 0 and less than or equal to 10 mm; and / or, The gap between the first seal and the third seal is greater than 0 and less than or equal to 10 mm.

10. The flue gas system according to any one of claims 1 to 9, characterized in that, The smoke guiding device includes a cover plate, a smoke guiding component, and a mounting bracket. The smoke guiding component defines a connecting hole and the flue. The connecting hole communicates with the flue. The cover plate is movably mounted on the smoke guiding component and can close or open the connecting hole. The mounting bracket is mounted on the smoke guiding component. The blind plate is movably mounted on the mounting bracket and can enter or exit the flue through the connecting hole.

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