Flue gas desulfurization tower and desulfurization system

Abstract

The flue gas desulfurization tower comprises a desulfurization tower, the desulfurization tower is provided with a box body, an inner cavity of the box body is provided with multiple layers of rectification pore plates which are located at different heights and form included angles with the horizontal plane, and the multiple layers of rectification pore plates are jointly matched with a combined spraying system. The combined spraying system is implemented in a forward / reverse two-way spraying mode on the two sides of the desulfurized flue gas, a demisting layer and a demisting layer cleaning pipeline are further arranged, a flue gas inlet communicated with the inner cavity is formed in one side of the box body, and a flue gas outlet matched with the flue gas inlet to form a desulfurized flue gas upward discharging circulation path is formed in the top of the box body. A slurry quick discharge channel is formed in the central area of the tower bottom of the box body; the box body is ingenious in structure, the multi-layer rectification pore plate design is adopted, and the height of the tower body and the energy consumption of the circulating pump are reduced; a combined spraying system improves the gas-liquid contact efficiency and reduces the use amount of a desulfurizing agent; the structural design of the tower body is optimized, and slurry deposition and blockage risks are reduced; the integrated supporting platform saves the occupied area.

Description

Technical Field

[0001] The present invention relates to a flue gas desulfurization tower, and in particular to a flue gas desulfurization tower and a desulfurization system. Background Art

[0002] Flue gas desulfurization technology is a core link in the field of industrial environmental protection, especially in high-pollution industries such as electrolytic aluminum. Traditional wet flue gas desulfurization generally adopts a vertical cylindrical tower structure, which has the following defects:

[0003] High energy consumption and high flue gas velocity within the tower often require multiple layers of reverse spray to maintain desulfurization efficiency, resulting in high system resistance and high power consumption of the main induced draft fan. Furthermore, the high liquid-to-gas ratio requires a large circulating pump head, which significantly contributes to power consumption. Desulfurization efficiency is low, and reverse spraying shortens the gas-liquid contact time, resulting in low desulfurizer utilization efficiency. A large amount of circulating slurry is required to contact the flue gas during the process.

[0004] To reduce energy consumption, existing technologies use horizontal desulfurization solutions. Traditional horizontal desulfurization solutions aim to reduce tower height and circulation pump head; gradual pore changes slow flue gas circulation velocity, reduce the number of spray layers, and enhance gas-liquid contact. However, this design still has drawbacks: Although the pore gradient design improves the air flow distribution, the slurry mainly relies on the spray layer for coverage, and passive bonding makes it difficult to form a continuous and stable liquid film. The gas-liquid contact utilization efficiency of the desulfurizer has not been fundamentally improved, and on this basis, it will still cause waste of desulfurizer. Summary of the Invention

[0005] In order to solve the deficiencies of the above technologies, the present invention provides a flue gas desulfurization tower and a desulfurization system.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a flue gas desulfurization tower and desulfurization system, including a desulfurization tower, the desulfurization tower is processed with a box body forming an inner cavity, the inner cavity of the box body is equipped with multiple layers of rectifying orifice plates located at different heights and all at an angle to the horizontal plane, the multiple layers of rectifying orifice plates are jointly equipped with a combined spraying system, the combined spraying system is implemented in a double-sided and forward / reverse bidirectional spraying manner on the desulfurized flue gas, and a demisting layer and a matching demisting layer cleaning pipeline are also arranged, a flue gas inlet connected to the inner cavity is opened on one side of the box body, a flue gas outlet is opened on the top of the box body to cooperate with the flue gas inlet to form an upward discharge flow path for the desulfurized flue gas, and a slurry quick discharge trough is opened in the central area of the bottom of the tower of the box body.

[0007] Furthermore, the tower bottom of the box body is formed in a manner of sloping downward from the left and right sides respectively toward the slurry quick discharge channel, and the downward inclination angles on the left and right sides of the tower bottom are the same and are both greater than 4°; the tower bottom of the box body is also formed in a manner of sloping downward from the rear side of the slurry quick discharge channel toward the side of its discharge outlet.

[0008] Furthermore, the tower top of the box body is formed in a manner of slanting upward from the left and right sides respectively toward the smoke outlet, and a plurality of inspection doors are also provided on the long side panels of the box body.

[0009] Furthermore, the multi-layered rectifying orifice plate includes a first rectifying orifice plate and a second rectifying orifice plate located directly above the first rectifying orifice plate and parallel to each other. The higher side edge of the first rectifying orifice plate is located above the flue gas inlet.

[0010] Furthermore, the combined spray system includes a first spray pipeline arranged below the first rectifying orifice plate, and the first spray pipeline is respectively extended along the length direction of the two long side panels at the front and rear of the box body. The first spray pipeline is implemented by a spray gun in a manner of multi-point coverage and upward spraying of desulfurization slurry in forward contact with the desulfurization flue gas. The angle adopted by the spray gun of the first spray pipeline is 90°-120°.

[0011] Furthermore, the combined spray system also includes a second spray pipeline arranged between the first rectifying orifice plate and the second rectifying orifice plate. The second spray pipeline is implemented by a spray gun with multi-point coverage and upper / lower double spraying of desulfurization slurry and desulfurization flue gas in forward / reverse bidirectional contact.

[0012] Furthermore, the demisting layer cleaning pipeline includes an upper demisting layer cleaning pipeline and a lower demisting layer cleaning pipeline respectively located above and below the demisting layer, and both the upper demisting layer cleaning pipeline and the lower demisting layer cleaning pipeline are equipped with cleaning nozzles.

[0013] A desulfurization system for a flue gas desulfurization tower, comprising: An integrated support platform located below the desulfurization tower, which includes a power distribution room, storage tanks, pits, and oxidation fans; A chimney connected to the outlet of the desulfurization tower through a desulfurization flue, wherein the chimney is provided with a reaction zone, a buffer zone, and a smoke exhaust zone from bottom to top; Also includes, A desulfurization circulation pump, whose inlet is connected to the reaction zone and whose outlet is connected to the second spray pipeline through the desulfurization slurry main pipeline, and the desulfurization slurry pipeline is also branched and connected to a desulfurization slurry branch pipeline connected to the first spray pipeline; The two ends of the liquid return pipeline are connected to the slurry quick discharge channel and the reaction zone respectively.

[0014] Furthermore, the reaction zone and the buffer zone are isolated by a reaction zone top plate, and the buffer zone and the smoke exhaust zone are isolated by a smoke exhaust zone bottom plate. A flue gas inlet connected to the desulfurization flue is provided on the smoke exhaust zone.

[0015] Furthermore, the included angle between the length extension lines of the desulfurization flue and the chimney is 45°.

[0016] A flue gas desulfurization tower and desulfurization system with an ingenious box structure and a multi-layer rectifying orifice plate design to reduce tower height and circulation pump energy consumption; a combined spray system improves gas-liquid contact efficiency and reduces desulfurizer usage; an optimized tower structure design reduces slurry deposition and blockage risks; and an integrated support platform saves floor space. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is the front view of the present invention.

[0018] Figure 2 It is a right side view of the present invention.

[0019] Figure 3 It is a schematic diagram of the internal structure of the present invention.

[0020] Figure 4 This is the right view of the desulfurization tower.

[0021] Figure 5 This is the zoning structure diagram of the chimney.

[0022] In the figure: 1. Integrated support platform; 2. Desulfurization tower; 3. Desulfurization flue; 4. Chimney; 5. Desulfurization circulation pump; 6. Desulfurization slurry main line; 7. Return liquid line; 8. Desulfurization slurry branch line; 9. Slurry quick discharge trough; 10. Tower bottom; 11. Box; 12. First rectifying orifice plate; 13. Second rectifying orifice plate; 14. Demisting layer; 15. Inspection door; 16. Tower top; 17. Flue gas outlet; 18. Cleaning pipeline on the upper part of the demisting layer; 19. Cleaning pipeline on the lower part of the demisting layer; 20. Second spray pipeline; 21. Flue gas inlet; 22. First spray pipeline; 23. Reaction zone; 24. Reaction zone top plate; 25. Buffer zone; 26. Smoke exhaust zone bottom plate; 27. Flue gas inlet; 28. Smoke exhaust zone. DETAILED DESCRIPTION

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] like Figure 1-5 As shown together, this embodiment is about a flue gas desulfurization tower and a desulfurization system, wherein the flue gas desulfurization tower includes a desulfurization tower 2, and the desulfurization system includes an integrated support platform 1 and a chimney 4 located below the desulfurization tower 2 for support. This embodiment does not limit the number of desulfurization towers 2 during implementation. This embodiment specifically shows the arrangement form when the number of desulfurization towers 2 is two, that is, Figure 2 As shown, the chimney 4 is located between the two desulfurization towers 2 and is connected respectively. The two desulfurization towers 2 operate in parallel without limiting the synchronization during operation. They can serve as backup for each other or be set as a single tower. This is specially explained.

[0025] like Figure 1As shown, the desulfurization tower 2 is processed with a box body 11 forming an inner cavity. The inner cavity of the box body 11 provides space for the desulfurization reaction. The outer structure of the box body 11 can be made of Q235B combined with 2205 composite steel plate or 2205 steel plate. The inner structure of the box body 11 is made of 2205 material, which does not require anti-corrosion treatment, reducing the subsequent maintenance cost. The inner cavity of the box body 11 is equipped with multiple layers of rectifying orifice plates at different heights and at an angle to the horizontal plane. The multiple layers of rectifying orifice plates are jointly equipped with a combined spraying system. Compared with traditional spraying facilities, the combined spraying system of this embodiment is implemented in a manner of spraying the desulfurized flue gas on both sides and in a forward / reverse bidirectional manner, and the spraying reaction effect is better. A demisting layer 14 and a demisting layer cleaning pipeline matched therewith are also arranged. , to enhance the cleaning effect of the demisting layer 14, a flue gas inlet 21 connected to the inner cavity is provided on one side of the box body 11, and a flue gas outlet 17 is provided on the top of the box body 11 to cooperate with the flue gas inlet 21 to form an upward flow path for the desulfurized flue gas. A slurry quick discharge channel 9 is provided in the central area of the tower bottom 10 of the box body 11. It should be noted that this embodiment is different from the traditional desulfurization tower. The desulfurization slurry is not stored in the lower layer of the box body 11 of this embodiment. This can prevent the problem of slurry deposition and scaling at the bottom of the tower of the traditional device, reduce the risk of blockage, and facilitate emptying and inspection. In addition, the lack of slurry deposition and soaking at the bottom of the tower can also reduce the cost of anti-corrosion treatment in the tower. When the dual desulfurization tower 2 is arranged, the circulation is more flexible, which is convenient for mutual backup or single tower setting.

[0026] Combine Figure 1-3 As shown in common, in the shape structure of the desulfurization tower 2, the tower bottom 10 of the box body 11 is formed in a manner of downward sloping from the left and right sides to the slurry quick discharge duct 9, that is, a dynamic diversion design is formed, which uses gravity to accelerate the discharge of the desulfurization slurry to avoid retention in the tower bottom 10; preferably, the downward angles on the left and right sides of the tower bottom 10 are the same and are both greater than 4°; in addition, in order to further strengthen the discharge of the desulfurization slurry, the tower bottom 10 of the box body 11 is also formed in a manner of downward sloping from the rear side of the slurry quick discharge duct 9 to the side of its discharge outlet. Not only that, the slurry quick discharge duct 9 is located in the central lateral outlet, which is beneficial to reducing the interference of the flue gas flow field compared with the traditional side wall center outlet and side outlet.

[0027] On this basis, the tower top 16 of the box body 11 is formed in a manner of sloping upward from the left and right sides to the flue gas outlet 17, so that the flue gas is accelerated to converge along the inclined surface, which is conducive to the discharge of the flue gas after desulfurization as soon as possible, and it is not easy to generate an upward vortex when the flue gas is accelerated to converge along the inclined surface, thereby reducing the exhaust resistance; in this embodiment, a number of inspection doors 15 are also provided on the long side panels of the box body 11, and each inspection door is arranged in a manner that leads directly to the inspection position on each floor, which is convenient for maintenance personnel to manage and repair.

[0028] The multi-layered rectifying orifice plate includes a first rectifying orifice plate 12 and a second rectifying orifice plate 13 located directly above the first rectifying orifice plate and parallel to each other. As disclosed above, the rectifying orifice plate is at an angle to the horizontal plane. In this embodiment, Figure 3 As shown, the higher side edge portion of the first rectifying orifice plate 12 is located above the flue gas inlet 21, which is beneficial to the uniform dispersion of the flue gas in the inner cavity of the box 11; in order to enhance the connection stability of the rectifying orifice plate, the rectifying orifice plate is manufactured in a modular design, and the inner wall of the box 11 corresponding to the position of each layer of the rectifying orifice plate is processed with a frame to facilitate the welding of the rectifying orifice plate. It should be noted that in the actual manufacturing process of this embodiment, the number of layers of the rectifying orifice plate can be determined according to demand. This embodiment shows a two-layer situation, but is not limited to it.

[0029] Combine Figure 3-4 As shown together, the combined spray system includes a first spray pipe 22 arranged below the first rectifying orifice plate 12. The first spray pipe 22 is respectively extended along the length direction of the front and rear long side panels of the box body 11. The first spray pipe 22 is implemented by a spray gun in a manner of multi-point coverage and upward spraying of desulfurization slurry in forward contact with the desulfurized flue gas. The angle adopted by the spray gun of the first spray pipe 22 is 90°-120°.

[0030] On this basis, the combined spray system also includes a second spray pipe 20 arranged between the first rectifying orifice plate 12 and the second rectifying orifice plate 13. The second spray pipe 20 is implemented by a spray gun in a manner of multi-point coverage and upper / lower double spraying of desulfurization slurry and forward / reverse bidirectional contact with the desulfurized flue gas. That is to say, the second spray pipe 20 not only provides the first rectifying orifice plate 12 with a downward spray in the opposite direction of the desulfurized flue gas, thereby enhancing the desulfurization effect of the flue gas passing through the first rectifying orifice plate 12, but also the downward spray can form a layer of desulfurization slurry water film on the structural surface of the first rectifying orifice plate 12, so that the rising flue gas can be more evenly and dispersedly contacted with the desulfurization slurry through the rectifying orifice plate, further improving the reaction efficiency. In addition, the upward spray of the second spray pipe 20 is again mixed with the flue gas passing through the second rectifying orifice plate 13 along the upward direction of the flue gas. The combination of the combined spray system and the rectifying orifice plate of this embodiment greatly improves the collision reaction of the gas phase and the liquid phase.

[0031] The specific structural forms of the demisting layer 14 include folded plate type, tube 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 respectively located above and below the demisting layer 14. The demisting layer 14, the upper demisting layer cleaning pipeline 18, and the lower demisting layer cleaning pipeline 19 are arranged 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 ability of the demisting layer 14.

[0032] The desulfurization system part of the flue gas desulfurization tower includes an integrated support platform 1 that integrates a distribution room, storage tanks, a pit, and an oxidation fan. That is to say, the integrated support platform 1 not only provides height support for the desulfurization tower 2, but also serves as a distribution room and has built-in desulfurization auxiliary equipment and ancillary equipment, reducing the overall footprint of the desulfurization system. It also provides the desulfurization tower with an appropriate height to allow the slurry to flow back to the chimney reaction area.

[0033] The chimney 4 is connected to the desulfurization tower outlet 17 through the desulfurization flue 3. Preferably, the angle between the length extension lines of the desulfurization flue 3 and the chimney 4 is 45°; the chimney 4 is provided with a reaction zone 23, a buffer zone 25, and a smoke exhaust zone 28 from bottom to top.

[0034] Preferably, the reaction zone 23 and the buffer zone 25 are isolated by a reaction zone top plate 24. The reaction zone 23 is a container for storing the circulating slurry of the desulfurization tower. In actual project construction, an agitator and an oxidation spray gun can also be set on the side of the reaction zone 23 to prevent slurry precipitation and accelerate the oxidation reaction of the desulfurization product. This is an existing technology and can be optimized according to the actual project.

[0035] The buffer zone 25 is hollow inside, which serves to connect the reaction zone and the smoke exhaust zone. Usually, no other equipment is installed inside. The buffer zone 25 and the smoke exhaust zone 28 are separated by the smoke exhaust zone bottom plate 26. The smoke exhaust zone bottom plate 26 can collect the reflux water of the smoke in the smoke exhaust zone. The collected water can flow out through the pipe. The smoke exhaust zone 28 is used to discharge the purified flue gas. It can be understood that a flue gas inlet 27 connected to the desulfurization flue 3 is provided on the smoke exhaust zone 28.

[0036] like Figure 2 As shown, this embodiment also includes a desulfurization circulation pump 5, which is actually also integrated in 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 pipeline 6 is also branched and connected to a desulfurization slurry branch pipeline 8 connected to the first spray pipeline 22; a return liquid pipeline 7, both ends of which are respectively connected to the slurry quick discharge channel 9 and the reaction zone 23; the circulation flow of the slurry is formed by the connection relationship of the above pipelines.

[0037] The present application discloses a flue gas desulfurization tower and desulfurization system, which has an ingenious box structure and adopts a multi-layer rectifying orifice plate design to reduce the tower height and the energy consumption of the circulation pump; the combined spray system improves the gas-liquid contact efficiency and reduces the amount of desulfurizer used; the tower structure design is optimized to reduce slurry deposition and blockage risks; and the integrated support platform saves floor space.

[0038] The above embodiments are not limitations of the present invention, and the present invention is not limited to the above examples. Any changes, modifications, additions or substitutions made by technicians in this technical field within the scope of the technical solution of the present invention also fall within the scope of protection of the present invention.

Claims

1. A flue gas desulfurization tower, characterized in that: The invention comprises a desulfurization tower (2), wherein the desulfurization tower (2) is processed with a box (11) forming an inner cavity, the inner cavity of the box (11) is equipped with multiple layers of rectifying orifice plates located at different heights and forming an angle with the horizontal plane, the multiple layers of rectifying orifice plates are jointly equipped with a combined spraying system, the combined spraying system is implemented in a manner of spraying the desulfurized flue gas on both sides and in a forward / reverse bidirectional manner, and a demisting layer (14) and a demisting layer cleaning pipeline matched therewith are also arranged, a flue gas inlet (21) connected to the inner cavity is provided on one side of the box (11), a flue gas outlet (17) cooperating with the flue gas inlet (21) to form an upward discharge flow path for the desulfurized flue gas is provided on the top of the box (11), and a slurry quick discharge channel (9) is provided in the central area of the tower bottom (10) of the box (11).

2. The flue gas desulfurization tower according to claim 1, characterized in that: The tower bottom (10) of the box body (11) is formed in a manner of being inclined downward from the left and right sides respectively toward the slurry quick discharge channel (9), and the downward angles of the left and right sides of the tower bottom (10) are the same and both are greater than 4°; the tower bottom (10) of the box body (11) is also formed in a manner of being inclined downward from the rear side of the slurry quick discharge channel (9) toward the discharge outlet side thereof.

3. The flue gas desulfurization tower according to claim 1, characterized in that: The tower top (16) of the box body (11) is formed in a manner of being inclined upward from the left and right sides respectively toward the smoke outlet (17), and a plurality of inspection doors (15) are also provided on the long side panels of the box body (11).

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

5. The flue gas desulfurization tower according to claim 4, characterized in that: The combined spraying system includes a first spraying pipeline (22) arranged below the first rectifying orifice plate (12), the first spraying pipeline (22) extending along the length direction of the front and rear long side panels of the box body (11), the first spraying pipeline (22) is implemented by a spray gun in a manner of covering multiple points and spraying desulfurization slurry upward to contact the desulfurization flue gas in a forward direction, and the angle adopted by the spray gun of the first spraying pipeline (22) is 90°-120°.

6. The flue gas desulfurization tower according to claim 5, characterized in that: The combined spray system further comprises a second spray pipeline (20) arranged between the first rectifying orifice plate (12) and the second rectifying orifice plate (13), wherein the second spray pipeline (20) is implemented by a spray gun in a manner of multi-point coverage and upper / lower double spraying of desulfurization slurry and forward / reverse bidirectional contact with the desulfurization flue gas.

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

8. The desulfurization system of a flue gas desulfurization tower according to any one of claims 1 to 7, characterized in that: include, An integrated support platform (1) is located below the desulfurization tower (2) for support, wherein the integrated support platform (1) includes a power distribution room, a storage tank, a pit, and an oxidation fan; A chimney (4) is connected to the desulfurization tower outlet (17) through a desulfurization flue (3), and the chimney (4) is provided with a reaction zone (23), a buffer zone (25), and a smoke exhaust zone (28) from bottom to top; Also includes, a desulfurization circulation pump (5), the inlet of which is connected to the reaction zone (23) and the outlet of which is connected to the second spray pipeline (20) via the desulfurization slurry main pipeline (6); the desulfurization slurry pipeline (6) is further branched and connected to a desulfurization slurry branch pipeline (8) that is in communication with the first spray pipeline (22); The liquid return pipeline (7) has two ends connected to the slurry quick discharge channel (9) and the reaction zone (23) respectively.

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

10. The desulfurization system of the flue gas desulfurization tower according to claim 8, characterized in that: The angle between the length extension lines of the desulfurization flue (3) and the chimney (4) is 45°.

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