A flue gas desulfurization tower and desulfurization system

Abstract

This utility model discloses a flue gas desulfurization tower and desulfurization system, including a desulfurization tower with a box body. The inner cavity of the box body is equipped with multiple layers of rectifier orifice plates located at different heights and all forming an angle with the horizontal plane. The multiple layers of rectifier orifice plates are matched with a combined spray system. The combined spray system sprays the desulfurized flue gas from both sides in a forward / reverse bidirectional manner. It also includes a demister layer and a demister layer cleaning pipeline. A flue gas inlet communicating with the inner cavity is opened on one side of the box body, and a flue gas outlet is opened on the top of the box body to cooperate with the flue gas inlet to form an upward flow path for the desulfurized flue gas. A slurry fast discharge channel is opened in the central area of ​​the bottom of the tower body. This utility model has an ingenious box structure and adopts a multi-layer rectifier orifice plate design to reduce the tower height and the energy consumption of the circulating pump. The combined spray system improves the gas-liquid contact efficiency and reduces the amount of desulfurizing agent used. The tower body structure design is optimized to reduce the risk of slurry deposition and blockage. The integrated support platform saves floor space.

Description

Technical Field

[0001] This utility model relates to flue gas desulfurization towers, and more particularly to a flue gas desulfurization tower and desulfurization system. Background Technology

[0002] Flue gas desulfurization technology is a core component of industrial environmental protection, especially in highly polluting industries such as electrolytic aluminum. Traditional wet desulfurization processes generally employ a vertical cylindrical tower structure, which has the following drawbacks:

[0003] High energy consumption and high flue gas velocity within the tower necessitate the use of multi-layer counter-current spraying to maintain desulfurization efficiency, resulting in high system resistance and high power consumption of the main induced draft fan. Simultaneously, the high liquid-to-gas ratio requires a large head for the circulating pump, leading to a significant proportion of electricity consumption. Low desulfurization efficiency is also a consequence, as counter-current spraying results in short gas-liquid contact time and low utilization efficiency of the desulfurizing agent, requiring a large amount of circulating slurry to contact the flue gas during the process.

[0004] To reduce energy consumption, existing technologies employ horizontal desulfurization schemes. Traditional horizontal desulfurization schemes aim to reduce tower height and circulating pump head; gradual pore size reduces flue gas flow velocity, decreases the number of spray layers, and enhances gas-liquid contact. However, this design still has drawbacks:

[0005] Although the pore gradient design improves airflow distribution, the slurry mainly relies on the spray layer for coverage. The passive combination makes it difficult to form a continuous and stable liquid film, and the utilization efficiency of the desulfurizer gas-liquid contact is not fundamentally improved. On this basis, it will still lead to the waste of desulfurizer. Utility Model Content

[0006] To address the shortcomings of the aforementioned technologies, this utility model provides a flue gas desulfurization tower and desulfurization system.

[0007] To solve the above technical problems, the technical solution adopted by this utility model is: a flue gas desulfurization tower and a desulfurization system, including a desulfurization tower, the desulfurization tower having a box forming an inner cavity, the inner cavity of the box being equipped with multiple layers of rectifier orifice plates located at different heights and all forming an angle with the horizontal plane, the multiple layers of rectifier orifice plates being matched with a combined spray system including multiple layers of spray pipes, and also having a demisting layer and a matching demisting layer cleaning pipe, a first flue gas inlet communicating with the inner cavity being opened on one side of the box, a flue gas outlet being opened on the top of the box cooperating with the first flue gas inlet to form a flue gas upward discharge path for desulfurized flue gas, and a slurry fast discharge channel being opened in the central area of ​​the bottom of the tower.

[0008] Furthermore, the bottom of the tower body is formed by sloping downwards from both the left and right sides toward the slurry fast discharge channel, with the sloping angles on both the left and right sides of the tower bottom being the same and both greater than 4°; the bottom of the tower body is also formed by sloping downwards from the rear side of the slurry fast discharge channel toward its discharge outlet side.

[0009] Furthermore, the top of the tower of the box is formed by sloping upwards from the left and right sides toward the flue gas outlet, and several maintenance doors are also opened on the long side panel of the box.

[0010] Furthermore, the multi-layer rectifier plate includes a first rectifier plate and a second rectifier plate located directly above it and parallel to each other, with the edge portion of the first rectifier plate on the higher side located above the first flue gas inlet.

[0011] Furthermore, the combined spray system includes a first spray pipe located below the first rectifier plate. The first spray pipe extends along the length of the front and rear long side panels of the housing. The first spray pipe is sprayed with spray guns to cover multiple points and spray desulfurization slurry in a forward contact with the desulfurization flue gas. The spray guns of the first spray pipe have an included angle of 90°-120°.

[0012] Furthermore, the combined spray system also includes a second spray pipeline disposed between the first rectifier orifice plate and the second rectifier orifice plate. The second spray pipeline is implemented by spray guns to cover multiple points and spray desulfurization slurry into bidirectional contact with the desulfurization flue gas in both forward and reverse directions.

[0013] Furthermore, the demisting layer cleaning pipeline includes an upper demisting layer cleaning pipeline and a lower demisting layer cleaning pipeline located above and below the demisting layer, respectively. Both the upper demisting layer cleaning pipeline and the lower demisting layer cleaning pipeline are equipped with cleaning nozzles.

[0014] A flue gas desulfurization tower desulfurization system includes,

[0015] An integrated support platform located below the desulfurization tower integrates a power distribution room, storage tanks, a pit, and an oxidation fan.

[0016] The chimney, which is connected to the desulfurization tower outlet via the desulfurization flue, is equipped with a reaction zone, a buffer zone, and a flue gas exhaust zone from bottom to top.

[0017] It also includes,

[0018] The desulfurization circulating pump has its inlet connected to the reaction zone and its outlet connected to the second spray pipeline through the main desulfurization slurry pipeline. The main desulfurization slurry pipeline also has branches connected to the first spray pipeline.

[0019] The return pipeline is connected at both ends to the slurry fast discharge channel and the reaction zone, respectively.

[0020] Furthermore, the reaction zone and the buffer zone are isolated by the top plate of the reaction zone, and the buffer zone and the flue gas zone are isolated by the bottom plate of the flue gas zone. The flue gas zone is provided with a flue gas inlet that connects to the desulfurization flue.

[0021] Furthermore, the angle between the length extension lines of the desulfurization flue and the chimney is 45°.

[0022] A flue gas desulfurization tower and desulfurization system are disclosed. The tower has an ingenious box structure and adopts a multi-layer rectifier orifice plate design to reduce the tower height and circulating pump energy consumption. The combined spray system improves gas-liquid contact efficiency and reduces the amount of desulfurizing agent used. The tower structure design is optimized to reduce the risk of slurry deposition and blockage. The integrated support platform saves floor space. Attached Figure Description

[0023] Figure 1 This is the front view of the present invention.

[0024] Figure 2 This is the right view of the present invention.

[0025] Figure 3 This is a schematic diagram of the internal structure of this utility model.

[0026] Figure 4 This is a right view of the desulfurization tower.

[0027] Figure 5 This is a diagram showing the partitioned structure of the chimney.

[0028] In the diagram: 1. Integrated support platform; 2. Desulfurization tower; 3. Desulfurization flue; 4. Chimney; 5. Desulfurization circulating pump; 6. Main desulfurization slurry pipeline; 7. Return pipeline; 8. Branch pipeline for desulfurization slurry; 9. Slurry fast discharge channel; 10. Tower bottom; 11. Box body; 12. First rectifier orifice plate; 13. Second rectifier orifice plate; 14. Demisting layer; 15. Inspection door; 16. Tower top; 17. Flue gas outlet; 18. Upper cleaning pipeline of the demisting layer; 19. Lower cleaning pipeline of the demisting layer; 20. Second spray pipeline; 21. First flue gas inlet; 22. First spray pipeline; 23. Reaction zone; 24. Top plate of the reaction zone; 25. Buffer zone; 26. Bottom plate of the exhaust zone; 27. Flue gas inlet; 28. Exhaust zone. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0030] like Figure 1-5 As shown in the figure, this embodiment relates to a flue gas desulfurization tower and a desulfurization system. The flue gas desulfurization tower includes a desulfurization tower 2, and the desulfurization system includes an integrated support platform 1 located below the desulfurization tower 2 and a chimney 4. This embodiment does not limit the number of desulfurization towers 2 during implementation; this embodiment specifically demonstrates an arrangement where there are two desulfurization towers 2, as shown below. Figure 2 As shown, the chimney 4 is located between the two desulfurization towers 2 and is connected to each other. The two desulfurization towers 2 operate in parallel and there is no limitation on the synchronicity of operation. They can serve as backups for each other or be set up as a single tower. This is hereby explained.

[0031] like Figure 1 As shown, the desulfurization tower 2 has a box 11 forming an inner cavity, which provides space for the desulfurization reaction. The external structure of the box 11 can be made of Q235B combined with 2205 composite steel plate or 2205 steel plate, while the internal structure of the box 11 is made of 2205 material, requiring no anti-corrosion treatment and reducing later maintenance costs. The inner cavity of the box 11 is equipped with multiple layers of rectifier orifice plates located at different heights and all forming an angle with the horizontal plane. The multiple layers of rectifier orifice plates are collectively equipped with a combined spray system. Compared with traditional spray facilities, the combined spray system in this embodiment implements bidirectional spraying of the desulfurization flue gas on both sides, with forward and reverse spraying, resulting in better spray reaction effect. A demister layer 14 and its matching demister layer cleaning pipeline are also arranged. The cleaning effect of the strong demisting layer 14 is achieved by opening a first flue gas inlet 21 on one side of the box body 11, which communicates with the inner cavity, and opening a flue gas outlet 17 on the top of the box body 11, which cooperates with the first flue gas inlet 21 to form a flue gas upward flow path for desulfurization flue gas. A slurry fast discharge channel 9 is opened in the central area of ​​the bottom 10 of the box body 11. It should be noted that this embodiment is different from the traditional desulfurization tower. In this embodiment, the lower layer of the box body 11 does not store desulfurization slurry. This can prevent the problem of slurry deposition and scaling at the bottom of the tower in the traditional device, reduce the risk of blockage, and facilitate venting and inspection. In addition, the absence of slurry deposition and soaking at the bottom of the tower can also reduce the cost of anti-corrosion treatment inside the tower. When the dual desulfurization towers 2 are arranged, the circulation is more flexible, which is convenient for mutual backup or single tower setting.

[0032] Combination Figure 1-3 As shown in the figure, in the shape and structure of the desulfurization tower 2, the bottom 10 of the box body 11 is formed in a downward slope from the left and right sides towards the slurry fast discharge channel 9, which is to form a dynamic flow guiding design. It uses gravity to accelerate the discharge of desulfurization slurry and avoids it from being stuck at the bottom 10 of the tower. Preferably, the downward slope angles on the left and right sides of the bottom 10 of the tower are the same and both are >4°. In addition, in order to further enhance the discharge of desulfurization slurry, the bottom 10 of the box body 11 is also formed in a downward slope from the rear side of the slurry fast discharge channel 9 towards its discharge outlet side. Moreover, the slurry fast discharge channel 9 is located in the center and the side outlet is more conducive to reducing the interference of flue gas flow field compared with the traditional side wall center outlet and side outlet.

[0033] Based on this, the top 16 of the tower of the box 11 is formed by sloping upwards from the left and right sides toward the flue gas outlet 17, so that the flue gas accelerates and converges along the slope, which is conducive to the rapid discharge of the desulfurized flue gas. Moreover, when the flue gas accelerates and converges along the slope, it is not easy to generate an upward swirling vortex, thus reducing the exhaust resistance. In this embodiment, several maintenance doors 15 are also provided on the long side panel of the box 11. Each maintenance door can directly lead to the location that needs to be inspected on each floor, which is convenient for maintenance personnel to manage and maintain.

[0034] The multi-layer rectifier orifice plate includes a first rectifier orifice plate 12 and a second rectifier orifice plate 13 located directly above it and parallel to each other. As disclosed above, the rectifier orifice plates form an angle with the horizontal plane. In this embodiment, if... Figure 3 As shown, the edge of the first rectifier plate 12 on the higher side is located above the first flue gas inlet 21, which is conducive to the uniform dispersion of flue gas in the inner cavity of the housing 11. In order to enhance the connection stability of the rectifier plate, the rectifier plate is modularly manufactured. The inner wall of the housing 11 is equipped with a frame corresponding to the position of each layer of rectifier plate to facilitate the welding of the rectifier plate. It should be noted that in the actual manufacturing process, the number of layers of rectifier plate can be determined according to the requirements. This embodiment shows a two-layer case, but it is not limited to this.

[0035] Combination Figure 3-4 As shown, the combined spray system includes a first spray pipe 22 located below the first rectifier plate 12. The first spray pipe 22 extends along the length of the front and rear long side panels of the housing 11. The first spray pipe 22 is sprayed with spray guns to cover multiple points and spray desulfurization slurry in a forward contact with the desulfurization flue gas. The spray guns of the first spray pipe 22 have an included angle of 90°-120°.

[0036] Based on this, the combined spray system also includes a second spray pipe 20 disposed between the first rectifier orifice plate 12 and the second rectifier orifice plate 13. The second spray pipe 20 is implemented by spraying guns to cover multiple points and spray desulfurization slurry in both upward and downward directions, contacting the desulfurized flue gas in both forward and reverse directions. That is to say, the second spray pipe 20 not only provides the first rectifier orifice plate 12 with downward spraying in the opposite direction to the desulfurized flue gas, enhancing the desulfurization effect of the flue gas exiting the first rectifier orifice plate 12, but also forms a layer of desulfurization slurry water film on the structural surface of the first rectifier orifice plate 12. In this way, the rising flue gas can contact the desulfurization slurry more evenly and dispersedly through the rectifier orifice plate, further improving the reaction efficiency. In addition, the upward spray of the second spray pipe 20 mixes again with the flue gas passing through the second rectifier orifice plate 13 in the direction of flue gas discharge. Thus, the combination of the combined spray system and the rectifier orifice plate in this embodiment greatly enhances the collision reaction of the gas phase and the liquid phase.

[0037] The specific structural forms of the demisting layer 14 include folded plate type, pipe row type, perforated plate type, and metal mesh type. The demisting layer cleaning pipeline includes an upper demisting layer cleaning pipeline 18 and a lower demisting layer cleaning pipeline 19 located above and below the demisting layer 14, respectively. The demisting layer 14, the upper demisting layer cleaning pipeline 18, and the lower demisting layer cleaning pipeline 19 are arranged in parallel to each other. Both the upper demisting layer cleaning pipeline 18 and the lower demisting layer cleaning pipeline 19 are equipped with cleaning nozzles to enhance the cleaning capability of the demisting layer 14.

[0038] The desulfurization system of the flue gas desulfurization tower includes an integrated support platform 1 that integrates a power distribution room, storage tank, pit, and oxidation fan. In other words, the integrated support platform 1 not only provides height support for the desulfurization tower 2, but also serves as a power distribution room and houses desulfurization auxiliary equipment and accessories, reducing the overall footprint of the desulfurization system. It also provides an appropriate height for the desulfurization tower to allow the slurry to flow back to the chimney reaction zone.

[0039] Chimney 4 is connected to desulfurization tower outlet 17 via desulfurization flue 3. Preferably, the angle between the length extension lines of desulfurization flue 3 and chimney 4 is 45°. Chimney 4 is provided with reaction zone 23, buffer zone 25 and exhaust zone 28 from bottom to top.

[0040] Preferably, the reaction zone 23 and the buffer zone 25 are separated by the top plate 24 of the reaction zone. The reaction zone 23 is a container for storing the circulating slurry of the desulfurization tower. In actual project construction, a stirrer and an oxidation spray gun can also be installed on the side of the reaction zone 23 to prevent slurry sedimentation and accelerate the oxidation reaction of desulfurization products. This is existing technology and can be optimized according to the actual project.

[0041] The buffer zone 25 is an empty cavity that connects the reaction zone and the exhaust zone. It is usually not equipped with other equipment. The buffer zone 25 and the exhaust zone 28 are separated by the exhaust zone floor plate 26. The exhaust zone floor plate 26 can collect the return water from the flue gas in the exhaust zone. The collected water can be discharged through a pipe. The exhaust zone 28 is used to discharge the purified flue gas. It is understood that the exhaust zone 28 is provided with a flue gas inlet 27 that is connected to the desulfurization flue duct 3.

[0042] like Figure 2 As shown, this embodiment also includes a desulfurization circulation pump 5, which is actually integrated into the integrated support platform 1. Its inlet is connected to the reaction zone 23 and its outlet is connected to the second spray pipeline 20 through the desulfurization slurry main pipeline 6. The desulfurization slurry main pipeline 6 is also branched with a desulfurization slurry branch pipeline 8 that is connected to the first spray pipeline 22; and a return pipeline 7, whose two ends are respectively connected to the slurry fast discharge channel 9 and the reaction zone 23; the circulation flow of slurry is formed through the connection of the above pipelines.

[0043] This application discloses a flue gas desulfurization tower and desulfurization system. The tower has an ingenious box structure and adopts a multi-layer rectifier orifice plate design to reduce the tower height and circulating pump energy consumption. The combined spray system improves gas-liquid contact efficiency and reduces the amount of desulfurizing agent used. The tower structure design is optimized to reduce the risk of slurry deposition and blockage. The integrated support platform saves floor space.

[0044] The above embodiments are not intended to limit the present utility model, nor is the present utility model limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the technical solution of the present utility model are also within the protection scope of the present utility model.

Claims

1. A flue gas desulphurization tower characterized in that: The equipment includes a desulfurization tower (2), which is equipped with a box (11) forming an inner cavity. The inner cavity of the box (11) is equipped with multiple layers of rectifier orifice plates located at different heights and all at an angle to the horizontal plane. The multiple layers of rectifier orifice plates are equipped with a combined spray system including multiple layers of spray pipes. A demisting layer (14) and a demisting layer cleaning pipe are also arranged therein. A first flue gas inlet (21) communicating with the inner cavity is opened on one side of the box (11). A flue gas outlet (17) is opened on the top of the box (11) to cooperate with the first flue gas inlet (21) to form a flue gas upward flow path for desulfurization flue gas. A slurry fast discharge channel (9) is opened in the central area of ​​the bottom (10) of the box (11).

2. The flue gas desulphurization tower according to claim 1, characterized in that: The bottom (10) of the box body (11) is formed by sloping downwards from the left and right sides toward the slurry fast discharge channel (9), and the sloping angles on the left and right sides of the bottom (10) are the same and both are >4°; the bottom (10) of the box body (11) is also formed by sloping downwards from the rear side of the slurry fast discharge channel (9) toward its discharge outlet side.

3. The flue gas desulfurization tower according to claim 1, characterized in that: The top (16) of the box (11) is formed in an upward slope from the left and right sides toward the flue gas outlet (17), and several maintenance doors (15) are also provided on the long side panel of the box (11).

4. The flue gas desulfurization tower according to claim 1, characterized in that: The multi-layered rectifier plate includes a first rectifier plate (12) and a second rectifier plate (13) located directly above it and parallel to each other, with the edge portion of the first rectifier plate (12) on the higher side located above the first flue gas inlet (21).

5. The flue gas desulfurization tower according to claim 4, characterized in that: The combined spray system includes a first spray pipe (22) located below the first rectifier plate (12). The first spray pipe (22) extends along the length of the front and rear long side panels of the box body (11). The first spray pipe (22) is implemented by spraying guns to cover multiple points and spraying desulfurization slurry in a forward contact with the desulfurization flue gas. The included angle of the spray guns of the first spray pipe (22) is 90°-120°.

6. The flue gas desulphurization tower according to claim 5, characterized in that: The combined spray system also includes a second spray pipe (20) disposed between the first rectifier orifice plate (12) and the second rectifier orifice plate (13). The second spray pipe (20) is implemented by spraying guns to cover multiple points and spray desulfurization slurry in both directions (forward and reverse) to contact the desulfurization flue gas.

7. The flue gas desulfurization tower according to claim 1, characterized in that: The demisting layer cleaning pipeline includes an upper demisting layer cleaning pipeline (18) and a lower demisting layer cleaning pipeline (19) located above and below the demisting layer (14), respectively. Both the upper demisting layer cleaning pipeline (18) and the lower demisting layer cleaning pipeline (19) are equipped with cleaning nozzles.

8. A desulfurization system for a flue gas desulfurization tower, characterized in that: include, An integrated support platform (1) is located below the desulfurization tower (2) and integrates a power distribution room, storage tank, pit and oxidation fan. The chimney (4) is connected to the desulfurization tower outlet (17) via the desulfurization flue (3). The chimney (4) is provided with a reaction zone (23), a buffer zone (25), and a flue gas exhaust zone (28) from bottom to top. It also includes, The desulfurization circulating pump (5) has its inlet connected to the reaction zone (23) and its outlet connected to the second spray pipeline (20) through the desulfurization slurry main pipeline (6). The desulfurization slurry main pipeline (6) also has a branch pipeline (8) connected to the first spray pipeline (22). The return pipeline (7) is connected at both ends to the slurry fast discharge channel (9) and the reaction zone (23).

9. The desulphurization system of the flue gas desulphurization tower according to claim 8, characterized in that: The reaction zone (23) and the buffer zone (25) are separated by the top plate (24) of the reaction zone, and the buffer zone (25) and the flue gas zone (28) are separated by the bottom plate (26) of the flue gas zone. The flue gas zone (28) is provided with a flue gas inlet (27) that is connected to the desulfurization flue (3).

10. The desulphurization system of the flue gas desulphurization tower as claimed in claim 8 wherein: The angle between the length extension lines of the desulfurization flue (3) and the chimney (4) is 45°.

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