Flow guide structure, boiler smoke exhaust device and boiler smoke exhaust system

Abstract

The utility model discloses a flow guide structure. The technical problem that backflow and backmixing are prone to occurring in an existing flue gas emission system is solved. The flow guide structure comprises a first pipeline, a second pipeline and a flow guide plate, the second pipeline is arranged on the side wall of the first pipeline, and the second pipeline communicates with the first pipeline; the guide plate is arranged on the side, close to the first pipeline, in the second pipeline, and a first included angle between the guide plate and the axial direction of the second pipeline is smaller than a second included angle between the axial direction of the second pipeline and the axial direction of the first pipeline. The backflow and backmixing conditions of the flue gas emission system can be reduced, meanwhile, turbulent flow is reduced, and noise generated when the flow guide structure operates is lowered.

Description

Technical Field

[0001] The present application belongs to the technical field of flue gas emission equipment, and specifically relates to a guide structure, a boiler smoke exhaust device and a boiler smoke exhaust system. Background Art

[0002] In order to achieve carbon peak and carbon neutrality, carbon dioxide capture, utilization and storage is the only way to achieve carbon dioxide emissions reduction from fossil energy, among which the carbon dioxide capture link is the core of the entire carbon dioxide capture, utilization and storage industry chain.

[0003] The carbon dioxide capture device is usually installed between the flue gas main and the chimney, specifically extracting part or all of the flue gas (referred to as raw flue gas) into the carbon dioxide capture device, and sending the flue gas that has captured CO2 (referred to as clean flue gas) back to the flue gas pipe in front of the chimney. However, the above setting has the risk of extracting clean flue gas into the raw flue gas, causing the flue gas to flow back and mix, thereby reducing the CO2 concentration entering the carbon dioxide capture device, and failing to ensure the stability of the flue gas flow and concentration entering the carbon dioxide capture device. Summary of the invention

[0004] In order to solve the technical problem that backflow and remixing are prone to occur in the current flue gas emission system, the present application provides a guide structure, a boiler smoke exhaust device and a boiler smoke exhaust system.

[0005] In a first aspect of the present application, a guide structure is provided, comprising a first pipe, a second pipe and a guide plate, wherein the second pipe is arranged on the side wall of the first pipe, and the second pipe is connected to the first pipe; the guide plate is arranged on a side of the second pipe close to the first pipe, and a first angle between the guide plate and the axial direction of the second pipe is smaller than a second angle between the axial direction of the second pipe and the axial direction of the first pipe.

[0006] In some embodiments, a plurality of guide plates are disposed in the second pipe, and the guide plates are spaced apart along the axial direction of the second pipe.

[0007] In some embodiments, the second angle is 30°-90°.

[0008] In some embodiments, the port of the second conduit is at least partially located within the first conduit.

[0009] In some embodiments, a wall of the second pipe located inside the first pipe is provided with a plurality of through holes.

[0010] In some embodiments, an opening area of ​​the plurality of through holes is 0.3-0.7 of a tube wall area of ​​the second tube located inside the first tube.

[0011] In some embodiments, the port of the second pipe is provided with an edge of a guide plate extending to the axis of the first pipe.

[0012] In some embodiments, a projection of the guide plate in a height direction falls within the first pipe.

[0013] In a second aspect of the present application, a boiler smoke exhaust device is provided, comprising a chimney, a desulfurization tower, a main pipeline and a carbon dioxide capture device, the carbon dioxide capture device having an air inlet pipe and an air outlet pipe; the main pipeline connects the bottom desulfurization tower with the chimney, the main pipeline is provided with two guide structures, the first pipelines of the two guide structures are both connected to the main pipeline, the second pipeline of the guide structure close to the desulfurization tower is connected to the air inlet pipe; the second pipeline of the guide structure close to the chimney is connected to the air outlet pipe, wherein the angle between the gas flow direction in the second pipelines of the two guide structures and the gas flow direction in the main pipeline is not greater than a right angle.

[0014] In a third aspect of the present application, a boiler smoke exhaust system is provided, comprising two boiler smoke exhaust devices, wherein the two boiler smoke exhaust devices share the same chimney, the air inlet pipes of the carbon dioxide capture devices of the two boiler smoke exhaust devices are connected, and the air outlet pipes of the carbon dioxide capture devices of the two boiler smoke exhaust devices are connected.

[0015] The guide structure, boiler smoke exhaust device and boiler smoke exhaust system guide plate provided according to one or more embodiments of the present application all play a role in pre-changing the flow direction of part of the fluid medium, that is, the guide plate plays a guiding role, improves the smoothness of the fluid medium flowing from the first pipe to the second pipe or from the second pipe to the first pipe, reduces the occurrence of backflow and re-mixing, and reduces the generation of turbulence, reducing the noise of the guide structure during operation. On the other hand, the guide plate also plays a buffering role, which can reduce the direct scouring of the fluid medium on the connection between the first pipe and the second pipe, reduce the probability of damage to the connection, and increase the service life of the guide structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic structural diagram of a flow guide structure in one or more embodiments of the present application is shown.

[0017] Figure 2 Shows Figure 1 Schematic diagram of the structure in the AA direction.

[0018] Figure 3 A structural schematic diagram showing an application of a flow guide structure in one or more embodiments of the present application is shown.

[0019] Figure 4A structural schematic diagram showing another application of the flow guide structure in one or more embodiments of the present application.

[0020] Figure 5 A schematic structural diagram of a boiler smoke exhaust device in one or more embodiments of the present application is shown.

[0021] Figure 6 A schematic structural diagram of a boiler smoke exhaust system in one or more embodiments of the present application is shown.

[0022] Explanation of the figure numbers: 1-first pipeline, 2-second pipeline, 21-through hole, 3-guide plate, 4-chimney, 5-desulfurization tower, 6-outlet pipe, 7-inlet pipe, 8-main pipeline, α-first angle, β-second angle. DETAILED DESCRIPTION

[0023] In order to make the technical personnel in the technical field to which the present application belongs to understand the present application more clearly, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0024] The fluid medium in the first pipeline 1 is consistent with the axial direction of the first pipeline 1, and the velocity direction of the fluid medium in the second pipeline 2 when flowing into the first pipeline 1 is consistent with the axial direction of the second pipeline 2. At the junction of the first pipeline 1 and the second pipeline 2, turbulence will be generated between the fluid medium in the first pipeline 1 and the fluid medium in the second pipeline 2, affecting the circulation of the fluid medium.

[0025] See also Figure 1-4 In a first aspect of the present application, a flow guide structure is provided, which includes a first pipe 1, a second pipe 2 and a flow guide plate 3. The second pipe 2 is arranged on the side wall of the first pipe 1, and the second pipe 2 is connected to the first pipe 1. The flow guide structure is applied to a pipe system for medium flow. The second pipe 2 can be used to drain out part of the medium in the first pipe 1, and the second pipe 2 can also be used to merge the medium in the second pipe 2 into the first pipe 1.

[0026] The guide plate 3 is arranged on one side of the second pipe 2 close to the first pipe 1 , and a first angle α between the guide plate 3 and the axial direction of the second pipe 2 is smaller than a second angle β between the axial direction of the second pipe 2 and the axial direction of the first pipe 1 .

[0027] It can be understood that the fluid medium in the first pipe 1 is consistent with the axial direction of the first pipe 1, and the velocity direction of the fluid medium in the second pipe 2 when flowing into the first pipe 1 is consistent with the axial direction of the second pipe 2. The guide plate 3 is arranged in the second pipe 2 to facilitate the assembly of the entire guide structure; the guide plate 3 is located on the side of the second pipe 2 close to the first pipe 1, that is, the guide plate 3 does not block the outlet of the second pipe 2.

[0028] The first angle α between the guide plate 3 and the axial direction of the second pipe 2 is smaller than the second angle β between the axial direction of the second pipe 2 and the axial direction of the first pipe 1. It can be understood that when the second pipe 2 can be used to drain part of the medium in the first pipe 1, the fluid medium will first contact the guide plate 3, and the fluid medium will change its flow direction for the first time after passing through the guide plate 3, and then contact the inner wall of the second pipe 2 to change its flow direction for the second time.

[0029] See also Figure 3 and Figure 4 When the second pipe 2 is used to merge the fluid medium in the second pipe 2 into the first pipe 1, part of the fluid medium in the second pipe 2 also contacts the guide plate 3 first, and the fluid medium changes its flow direction for the first time through the guide plate 3, and then mixes with the inner wall of the first pipe 1 or the fluid medium in the first pipe 1 to change its flow direction for the second time. In the above, the guide plate 3 plays the role of pre-changing the flow direction of part of the fluid medium, that is, the guide plate 3 plays a guiding role, which improves the smoothness of the fluid medium flowing from the first pipe 1 to the second pipe 2 or from the second pipe 2 to the first pipe 1, reduces the occurrence of backflow and remixing, and at the same time reduces the generation of turbulence, and reduces the noise of the guide structure during operation. On the other hand, the guide plate 3 also plays a buffering role, which can reduce the direct scouring of the fluid medium on the connection between the first pipe 1 and the second pipe 2, reduce the probability of damage to the connection, and increase the service life of the guide structure.

[0030] Among them, the guide plate 3 is connected to the inner wall of the second pipe 2 only at two opposite ends. It can be understood that a dead angle can be avoided between the guide plate 3 and the second pipe 2 to affect the circulation of the fluid medium.

[0031] See also Figure 1 and Figure 2 In some embodiments, a plurality of guide plates 3 are disposed in the second pipe 2 , and the guide plates 3 are spaced apart along the axial direction of the second pipe 2 .

[0032] There are gaps between adjacent guide plates 3, and the fluid medium can pass through between adjacent guide plates 3 and then flow along the inner wall of the second pipe 2 or enter the first pipe 1. By providing multiple guide plates 3 to guide more fluid media, the stability of the fluid medium is further improved.

[0033] In some embodiments, the second angle β is 30°-90°.

[0034] That is, the second angle β between the axis of the second pipeline 2 and the axis of the first pipeline 1 can be customized according to the scenario in which the guide structure is to be used. Among them, when the second pipeline is used for the fluid medium to flow into the first pipeline 1, the assembler ensures that the guide plate 3 is located in the second pipeline 2 on the side close to the inlet direction of the fluid medium on the first pipeline 1, so that the fluid medium flowing out of the second pipeline 2 can be smoothly introduced into the first pipeline 1 after being guided by the guide plate; when the second pipeline is used to lead out the fluid medium in the first pipeline 1, ensure that the guide plate is located in the second pipeline 2 on the side close to the outlet of the fluid medium on the first pipeline 1, so that the guide plate can play a guiding role and lead part of the fluid medium in the first pipeline 1 into the second pipeline 2.

[0035] In some embodiments, the port of the second conduit 2 is at least partially located within the first conduit 1 .

[0036] The second pipe 2 has a port for the fluid medium to flow out or flow in, and the port of the second pipe 2 is at least partially located in the first pipe 1. Especially when the second angle β is an acute angle, the inclination of the port of the second pipe 2 will facilitate the flow of the fluid medium between the first pipe 1 and the second pipe 2.

[0037] Specifically, when the second pipeline is used for the fluid medium to flow into the first pipeline 1, part of the outer wall of the second pipeline 2 located in the first pipeline 1 blocks part of the fluid medium in the first pipeline 1, and the port of the second pipeline 2 faces the end of the flow direction of the fluid medium in the first pipeline 1, which is conducive to the fluid medium in the second pipeline 2 to quickly flow into the first pipeline 1, and backflow is not likely to occur.

[0038] When the second pipeline is used to lead out the fluid medium in the first pipeline 1 , the port of the second pipeline 2 faces the starting end of the flow direction of the fluid medium in the first pipeline 1 , which is conducive to introducing part of the fluid medium in the first pipeline 1 into the second pipeline 2 .

[0039] Of course, considering that the flow rate of the fluid medium in the first pipeline 1 of the equipment partially installed with the guide structure is relatively fast, in some embodiments, the tube wall of the second pipeline 2 located in the first pipeline 1 is provided with a plurality of through holes 21, and the resistance of the portion of the second pipeline 2 located in the first pipeline 1 to the fluid medium in the first pipeline 1 is reduced by the plurality of through holes 21. The opening area of ​​the plurality of through holes 21 is 0.3-0.7 of the area of ​​the tube wall of the second pipeline 2 located in the first pipeline 1. When the portion of the second pipeline 2 located in the first pipeline 1 is larger, the ratio of the opening area of ​​the plurality of through holes 21 to the area of ​​the tube wall of the second pipeline 2 located in the first pipeline 1 can be increased accordingly.

[0040] In some embodiments, the port of the second pipe 2 is provided with an edge of the guide plate 3 extending to the axis of the first pipe 1. The first angle α is 25°, the second angle β is 45°, and the opening area of ​​the plurality of through holes 21 is 0.5 of the area of ​​the pipe wall of the second pipe 2 located on the first pipe 1, so as to achieve a balance between ensuring the stable flow of the fluid medium between the first pipe 1 and the second pipe 2 and the influence of the second pipe 2 on the fluid medium in the first pipe 1.

[0041] In some embodiments, the projection of the guide plate 3 in the height direction falls within the first pipe 1. The height direction of the guide plate 3 is perpendicular or nearly perpendicular to the plane where the axis of the first pipe 1 and the axis of the second pipe 2 are located. The guide plate 3 is located not only in the second pipe 2, but also in the first pipe 1.

[0042] Based on the same inventive concept, please refer to Figure 5 The second aspect embodiment of the present application provides a boiler smoke exhaust device, including a chimney 4, a desulfurization tower 5, a main pipeline 8 and a carbon dioxide capture device. The carbon dioxide capture device has an air inlet pipe 7 and an air outlet pipe 6. The original flue gas enters the carbon dioxide capture device through the air inlet pipe 7 and is discharged from the air outlet pipe 6.

[0043] The main pipeline 8 connects the bottom desulfurization tower 5 and the chimney 4. The main pipeline 8 is provided with two guide structures. The first pipelines 1 of the two guide structures are connected to the main pipeline 8. The second pipeline 2 of the guide structure close to the desulfurization tower 5 is connected to the air inlet pipe 7; the second pipeline 2 of the guide structure close to the chimney 4 is connected to the air outlet pipe 6, wherein the angle between the gas flow direction in the second pipelines 2 of the two guide structures and the gas flow direction in the main pipeline 8 is not greater than a right angle.

[0044] It can be understood that the raw flue gas discharged from the desulfurization tower 5 flows to the chimney 4 through the main pipe 8. Part of the raw flue gas in the main pipe 8 is diverted when passing through the first guide structure, and part of the raw flue gas enters the carbon dioxide capture device through the second pipe 2 of the first guide structure. After being treated by the carbon dioxide capture device, clean flue gas is obtained. The clean flue gas enters the second pipe 2 of the second guide structure on the main pipe 8 through the pipe and enters the main pipe 8, and is discharged from the chimney 4 along with part of the raw flue gas in the main pipe 8. Due to the presence of the guide plate 3 in the two guide structures, the raw flue gas in the main pipe 8 can be smoothly diverted, and the clean flue gas treated by the carbon dioxide capture device can also be quickly merged into the main pipe 8. And the guide plate 3 can help the fluid medium to turn, reduce the generation of turbulence in the main pipe 8, the first pipe 1 and the second pipe 2, so that the flue gas in the entire boiler exhaust system flows smoothly.

[0045] Of course, in some embodiments, the first pipeline 1 can be a part of the main pipeline 8.

[0046] Based on the same inventive concept, please refer to Figure 6 According to a third aspect of the present application, a boiler smoke exhaust system comprises two boiler smoke exhaust devices, wherein the two boiler smoke exhaust devices share a same chimney 4, the air inlet pipes 7 of the carbon dioxide capture devices of the two boiler smoke exhaust devices are connected, and the air outlet pipes 6 of the carbon dioxide capture devices of the two boiler smoke exhaust devices are connected.

[0047] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0048] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise" and "counterclockwise" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0049] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0050] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0051] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A flow guide structure, characterized in that: include: First pipeline; a second pipeline, disposed on a side wall of the first pipeline, the second pipeline being in communication with the first pipeline; The guide plate is arranged on one side of the second pipe close to the first pipe, and a first angle between the guide plate and the axial direction of the second pipe is smaller than a second angle between the axial direction of the second pipe and the axial direction of the first pipe.

2. The flow guiding structure according to claim 1, characterized in that: A plurality of guide plates are arranged in the second pipeline, and the guide plates are arranged at intervals along the axial direction of the second pipeline.

3. The flow guiding structure according to claim 1, characterized in that: The second angle is 30°-90°.

4. The flow guiding structure according to claim 1, characterized in that: The port of the second conduit is at least partially located within the first conduit.

5. The flow guiding structure according to claim 4, characterized in that: The wall of the second pipeline located inside the first pipeline is provided with a plurality of through holes.

6. The flow guiding structure according to claim 5, characterized in that: The opening area of ​​the plurality of through holes is 0.3-0.7 of the wall area of ​​the second pipe located in the first pipe.

7. The flow guiding structure according to claim 4, characterized in that: The port of the second pipeline is provided with an edge of a guide plate extending to the axis of the first pipeline.

8. The flow guiding structure according to claim 4, characterized in that: The projection of the guide plate in the height direction falls within the first pipe.

9. A boiler smoke exhaust device, characterized in that: include: chimney; Desulfurization tower; a carbon dioxide capture device having an inlet pipe and an outlet pipe; A main pipeline connects the bottom desulfurization tower and the chimney, and the main pipeline is provided with two guide structures. The first pipelines of the two guide structures are connected to the main pipeline, and the second pipeline of the guide structure close to the desulfurization tower is connected to the air inlet pipe; the second pipeline of the guide structure close to the chimney is connected to the air outlet pipe, wherein the angle between the gas flow direction in the second pipelines of the two guide structures and the gas flow direction in the main pipeline is not greater than a right angle.

10. A boiler smoke exhaust system, characterized in that: It comprises two boiler smoke exhaust devices as claimed in claim 9, wherein the two boiler smoke exhaust devices share the same chimney, the air inlet pipes of the carbon dioxide capture devices of the two boiler smoke exhaust devices are connected, and the air outlet pipes of the carbon dioxide capture devices of the two boiler smoke exhaust devices are connected.

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