High-efficiency desulfurization tower

Abstract

The present invention relates to the technical field of desulfurization towers, and discloses a high-efficiency desulfurization tower, comprising a tower body with a smoke inlet at the bottom, wherein a first spraying portion, a swirl portion, and a demister are sequentially arranged in the tower body from bottom to top, wherein the first spraying portion comprises a main pipe connected to an external lime slurry, a plurality of branch pipes connected to the main pipe and distributed in a tree-like manner relative to the main pipe, a plurality of nozzles connected and connected to the branch pipes, and a spray regulating portion arranged on each nozzle. By arranging the spray regulating portion on the nozzle, the lime slurry can be sprayed downward and dispersed only from the nozzle when the flue gas volume is small, the speed is slow, and the airflow dynamics is small; when the flue gas volume increases, the airflow speed becomes faster, and the airflow dynamics become larger, the airflow dynamics pushes the spray regulating portion to move, thereby increasing the spray direction and position of the lime slurry, thereby changing the spray direction and height of part of the lime slurry, so that the flue gas and the lime slurry have multiple contacts, thereby improving the flue gas purification effect.

Description

Technical Field

[0001] The present invention relates to the technical field of desulfurization towers, in particular to a high-efficiency desulfurization tower. Background Art

[0002] With the development of equipment and the continuous advancement of science and technology, people are becoming more and more aware of environmental protection. In the process of industrial coal combustion, flue gas is inevitably generated and discharged. Coal-fired flue gas generally contains a lot of dust, sulfide gases and greenhouse gases. Therefore, it is usually necessary to purify the flue gas before discharge to purify the harmful substances in the flue gas to the maximum extent before discharge. However, the existing coal-fired flue gas purification process generally adopts wet flue gas desulfurization during the purification process. The desulfurization diluent is directly sprayed to absorb the sulfide gases in the flue gas, thereby achieving the desulfurization effect. That is, by spraying lime slurry into the flue gas, the sulfur dioxide in the flue gas reacts with the calcium ions in the lime slurry to form calcium sulfite, which is then oxidized by oxygen to form calcium sulfate. The spraying device for spraying lime slurry usually sprays downward, and the flue gas mixes and reacts with the lime slurry sprayed from the spraying device during the upward process from the bottom of the spraying device. However, the direction of the airflow during the rising process of the flue gas is usually vertically upward. When the flue gas speed is slow, the mixing effect of the lime slurry and the flue gas is relatively good. When the flue gas speed is fast, the contact time between the flue gas and the lime slurry is short, the reaction effect on the harmful substances in the flue gas will be relatively poor, and the effect of removing the harmful substances will be relatively poor. Summary of the Invention

[0003] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a high-efficiency desulfurization tower to solve the problem that the desulfurization effect of the desulfurization tower on flue gas is greatly affected by the size and velocity of the flue gas.

[0004] In order to solve the above technical problems, a technical solution adopted by the present invention is: to provide a high-efficiency desulfurization tower including a tower body with a smoke inlet at the bottom, wherein the tower body is provided with a first spray part, a swirl part and a demister in sequence from bottom to top, the first spray part includes a main pipe connected to the external lime slurry, a plurality of branch pipes connected to the main pipe and distributed in a tree shape relative to the main pipe, a plurality of nozzles connected and connected to each branch pipe, and a spray adjustment part provided on each nozzle, the spray adjustment part can change the spraying of the lime slurry according to the change in the size of the flue gas airflow, so as to increase the spraying direction of the lime slurry when the airflow velocity is fast and the airflow thrust is sufficient, thereby realizing multi-directional and multi-angle injection, ensuring that the flue gas and the lime slurry are in more sufficient contact, and improving the purification effect.

[0005] Furthermore, the nozzle includes a liquid outlet pipe having one end connected to the corresponding branch pipe and a first nozzle connected to the other end of the liquid outlet pipe. The liquid outlet pipe is arranged to extend downward in a vertical direction, and a liquid outlet secondary hole is formed on the side wall of the liquid outlet pipe. The spray adjustment part is slidably installed on the liquid outlet pipe in the vertical direction and opens and closes the liquid outlet secondary hole, thereby realizing the conversion of the spray direction as needed to adapt to different situations.

[0006] Furthermore, the spray adjustment part includes a sleeve that is slidably mounted on the liquid outlet pipe in a vertical direction and blades formed on the sleeve and distributed in a spiral pattern, the sleeve being made of a lightweight material, and an annular cavity is recessed around the inner wall of the sleeve facing the liquid outlet pipe, and a plurality of connected annular cavities are opened on the outer wall of the sleeve and face different flow channels; the blades have a flat section extending laterally and an arc section that bends and tilts from the flat section toward the first nozzle side, and when the flue gas flow reaches a certain pressure, the sleeve is pushed upward by contact with the flat section of the blade until the annular cavity is connected to the liquid outlet secondary hole, so that the sleeve can be pushed upward when the flue gas flow reaches a certain power until the liquid outlet secondary hole faces its annular cavity, so that only the lime slurry sprayed downward is ejected from the flow channel through the liquid outlet secondary hole, thereby causing the lime slurry to be ejected from different heights and directions, thereby increasing the purification effect of the flue gas.

[0007] Furthermore, the sleeve is rotatably mounted on the liquid outlet pipe, and each of the flow channels is arc-shaped and spirally distributed. A second nozzle is provided on one end of each flow channel away from the liquid outlet pipe, so that after the sleeve rotates, the centrifugal force can promote the output of the lime slurry in the flow channel to a certain extent.

[0008] Furthermore, each of the curved segments intersects with the spraying direction of the lime slurry output from each second nozzle, so that part of the sprayed lime slurry is further dispersed by the curved segment after hitting the curved segment, thereby improving the purification effect.

[0009] Furthermore, a connecting block is provided on one end of the liquid outlet pipe close to the first nozzle, and a first bearing is provided on the connecting block for connecting to the sleeve so that the sleeve can rotate relative to the liquid outlet pipe. A plurality of grooves are concavely provided on the side surface of the sleeve facing the connecting block, and an elastic member is vertically arranged in each of the grooves. The two ends of the elastic member are respectively connected to the inner wall of the groove and the first bearing. The elastic member and the sleeve rotate synchronously with the first bearing to limit the sliding position of the sleeve to a certain extent after the sleeve is pushed upward by the flue gas power.

[0010] Furthermore, the swirl part includes a first connecting plate sealed and connected to the inner cavity of the tower body and a number of amplifiers evenly distributed on the bottom surface of the first connecting plate. Each of the amplifiers passes through the first connecting plate in the vertical direction. The amplifier is used to change the direction of the airflow when the flue gas passes through, so as to further enhance the full reaction of the flue gas.

[0011] Furthermore, the enhancer includes an outer tube connected to the first connecting plate and passing through vertically, and several spoiler sheets arranged in the outer tube and distributed in a spiral pattern. When the smoke contacts the spoiler sheets, the airflow direction of the smoke is stirred, thereby increasing the residence time of the smoke.

[0012] Furthermore, the amplifier further includes at least one middle tube and an inner tube coaxially and spaced apart from each other inside the outer tube to divide the outer tube into at least two annular flow-turbulating chambers, each of the flow-turbulating chambers passing through the first connecting plate, and the spoilers are arranged in a plurality of groups corresponding to the flow-turbulating chambers and are spirally arranged in each of the flow-turbulating chambers to enhance the flow-turbulating effect of the amplifier.

[0013] Furthermore, a second spray portion having the same structure as the first spray portion is provided between the cyclone portion and the demister, thereby increasing the spraying amount of the lime slurry at the same time and achieving secondary spray purification.

[0014] The high-efficiency desulfurization tower of the present invention has at least the following beneficial effects: by arranging a spray adjustment part on the nozzle, the lime slurry can be sprayed downward and dispersed only from the nozzle when the flue gas volume is small, the speed is slow, and the airflow dynamics is small, forming a conical spray range, thereby mixing and reacting the flue gas at this time; when the flue gas volume increases, the airflow speed becomes faster, and the airflow dynamics becomes larger, the airflow dynamics pushes the spray adjustment part to move and increase the injection direction and position of the lime slurry, thereby changing the injection direction and height of part of the lime slurry, so that the flue gas and the lime slurry have multiple contacts to improve the purification effect of the flue gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0016] Figure 1 This is a schematic structural diagram of a high-efficiency desulfurization tower according to the present invention;

[0017] Figure 2 It is a front cross-sectional view of a high-efficiency desulfurization tower of the present invention;

[0018] Figure 3 Schematic diagram of the structure of the demister of the present invention;

[0019] Figure 4 Schematic diagram of the structure of the first spray part of the present invention;

[0020] Figure 5 This is a front cross-sectional view of the cooperation between the nozzle and the spray adjustment part of the present invention;

[0021] Figure 6A top cross-sectional view of the cooperation between the nozzle and the spray adjustment part of the present invention;

[0022] Figure 7 It is a structural schematic diagram of the swirl portion of the present invention;

[0023] Figure 8 for Figure 7 Magnified view of part A shown.

[0024] The meanings of the reference numerals in the accompanying drawings are:

[0025] Tower body 1; smoke inlet 11; chimney 12; first spray unit 2; main pipe 21; branch pipe 22; nozzle 23; liquid outlet pipe 231; first pipe section 2311; second pipe section 2312; liquid outlet secondary hole 2313; connecting end 2314; first nozzle 232; spray adjustment unit 24; sliding sleeve 241; rolling groove 2411; blade 242; flat section 24 21; curved segment 2422; annular cavity 243; flow channel 244; second nozzle 245; connecting block 2461; first bearing 2462; groove 2463; elastic member 2464; swirl section 3; first connecting plate 31; enhancer 32; outer tube 321; spoiler 322; middle tube 323; inner tube 324; second spray section 4; demister 5. DETAILED DESCRIPTION

[0026] The present invention will be further described below with reference to the accompanying drawings.

[0027] like Figures 1 to 8 As shown, the high-efficiency desulfurization tower of the present invention includes a tower body 1 with a smoke inlet 11 at the bottom, a first spray part 2, a swirl part 3, a second spray part 4 and a demister 5 arranged in the tower body 1, wherein the first spray part 2, the swirl part 3, the second spray part 4 and the demister 5 are arranged in sequence from bottom to top; the smoke inlet 11 allows the smoke to enter the tower body 1, and the height of the smoke inlet 11 is lower than the first spray part 2, so that the smoke enters the tower body 1 and rises upward and passes through the first spray part 2, the swirl part 3, the second spray part 4 and the demister 5 in sequence before being output from the top of the tower body 1. The first spray section 2 and the second spray section 4 are both used to spray lime slurry into the tower body 1 so that the sulfur dioxide in the flue gas can react with the calcium ions in the lime slurry to generate calcium sulfite. The flue gas passing through the first spray section 2 then passes through the cyclone section 3. The cyclone section 3 changes the direction of the airflow so that the calcium sulfite in the flue gas is more fully in contact with the air and is oxidized to generate calcium sulfate, thereby purifying the harmful substance sulfur dioxide in the flue gas and achieving the purpose of desulfurization. The demister 5 is used to better remove the water vapor carried in the flue gas so that the purified flue gas can be output from the top of the tower body 1 to complete the preliminary purification of the flue gas.

[0028] In this embodiment, the smoke inlet 11 of the tower body 1 is located at the bottom of the tower body 1 and extends through the side wall of the tower body 1. To facilitate the installation of the tower body 1 and its various components, the tower body 1 is formed by connecting multiple tower sections in sequence along the vertical direction. Adjacent tower sections are sealed. The bottom of the lowest tower section is sealed and the top is open, while the other tower sections are all vertically connected. The smoke inlet 11 is located on the side wall of the lowest tower section. The second tower section at the top is trumpet-shaped and narrow at the top and wide at the bottom. The first tower section at the top and other tower sections can be cylindrical tubular structures. The diameter of the first tower section at the top is the same as the diameter of the narrow end of the second tower section at the top. The first tower section at the top is defined as the chimney 12 of the tower body 1 to facilitate the output of desulfurized flue gas therefrom. The cooperation between the chimney 12 and the second tower section at the top, based on the Venturi principle, can increase the flow rate of the flue gas output from the chimney 12, improve the airflow dynamics, and facilitate subsequent flue gas purification.

[0029] In this embodiment, at least one first spray section 2 is provided and is spaced apart in the vertical direction within the tower body 1. The first spray section 2 comprises a main pipe 21 connected to the external lime slurry, a plurality of branch pipes 22 connected to the main pipe 21 and arranged in a tree-like pattern relative to the main pipe 21, a plurality of nozzles 23 connected to and connected to the branch pipes 22, and a spray adjustment section 24 provided on each nozzle 23. The main pipe 21 facilitates connection with the external source pipeline of the lime slurry, and the branch pipes 22 facilitate distribution of the lime slurry in various directions and positions when outputting the lime slurry and spraying the lime slurry downward from different positions through the nozzles 23. The spray adjustment section 24 changes the spray range of the lime slurry according to the size of the flue gas flow and the power of the flue gas flow. For a small amount of flue gas, the flue gas flow rate is usually slightly higher than that of a large amount of flue gas. The spray regulating part 24 does not work temporarily, and the flue gas is only mixed with the lime slurry sprayed from the nozzle 23 to react with more than 90% of the sulfur dioxide in the flue gas; when the flue gas volume increases, the flue gas flow rate increases and the power increases, the rising airflow drives the spray regulating part 24 to move upward, so that the spray regulating part 24 increases the output position and direction of the lime slurry, so that part of the flue gas that does not have time to react with the lime slurry continues to pass through the increased spray range of the spray regulating part 24 after passing through the spray range of the nozzle 23, thereby increasing the treatment effect on the sulfur dioxide in the flue gas, thereby being able to automatically adapt to the corresponding spray range according to the flue gas flow rate and improve the desulfurization effect.

[0030] As defined in this embodiment, the main pipe 21 comprises at least two sections of secondary pipes, each of which is sealed and connected in sequence. The diameters of the secondary pipes decrease from the end connected to the external lime slurry pipeline to the end extending into the tower body 1. That is, the diameter of the secondary pipe closer to the external lime slurry pipeline is larger than the diameter of the secondary pipe closer to the tower body 1. The connection between any two adjacent secondary pipes forms a frustum-shaped structure, so that the flow rate of the lime slurry increases with each entry into the next secondary pipe according to the Venturi principle, thereby ensuring that the pressure of the lime slurry output by the branch pipe 22 from each secondary pipe at each position is sufficient. As defined in this embodiment, the branch pipes 22 are symmetrically connected to the secondary pipes and arranged parallel to each other. Each main pipe 21 has the same structure as the main pipe 21, with the diameter gradually decreasing from the main pipe 21 toward the side away from the main pipe 21 to ensure relative pressure balance.

[0031] In the content defined in this embodiment, each branch pipe 22 is provided with a plurality of nozzles 23, and the plurality of nozzles 23 are evenly distributed to ensure that each nozzle 23 can cover the inner cavity of the tower body 1, thereby ensuring the desulfurization effect on the flue gas. Each nozzle 23 includes a liquid outlet pipe 231 connected to the corresponding branch pipe 22 at one end and a first nozzle 232 connected to the other end of the liquid outlet pipe 231. The liquid outlet pipe 231 includes a first pipe section 2311 connected to the branch pipe 22 and parallel to the main pipe 21 in the horizontal direction, and a second pipe section 2312 connected to the first pipe section 2311 and extending downward in the vertical direction. The position of each first pipe section 2311 is set according to the inner cavity of the tower body 1, including the adjustment of length and position, and the length and position of the corresponding branch pipe 22 are also adjusted accordingly. A secondary outlet hole 2313 is formed through the sidewall of the second pipe section 2312 of the liquid outlet pipe 231. The secondary outlet hole 2313 is spaced a certain distance from the first nozzle 232 and located above the first nozzle 232, allowing the lime slurry to be discharged from the first nozzle 232 and the secondary outlet hole 2313 respectively. The secondary outlet hole 2313 can be opened radially along the second pipe section 2312, or it can be opened in other directions. A spray adjustment unit 24 is vertically slidably mounted on the liquid outlet pipe 231 to block or open the secondary outlet hole 2313, thereby enabling the secondary outlet hole 2313 to be opened and closed. The first nozzle 232 is located at the bottom end of the second pipe section 2312 and sprays downward. The spray ranges of adjacent first nozzles 232 are connected to ensure relatively comprehensive coverage of the interior of the tower body 1. It should be noted that the nozzle 23 may be any conventional nozzle 23 .

[0032] In the content defined in this embodiment, the number of spray adjustment parts 24 and liquid outlet pipes 231 corresponds to each other for adaptation, and each spray adjustment part 24 is arranged on the second pipe section 2312 of the liquid outlet pipe 231 (hereinafter referred to as "liquid outlet pipe 231"). Each spray adjustment part 24 includes a sliding sleeve 241 that is slidably sleeved on the liquid outlet pipe 231 in the vertical direction and blades 242 formed on the sliding sleeve 241. Each blade 242 is distributed in an annular array and is spiral. When the airflow power brought by the flue gas is sufficient, the flue gas from bottom to top can push the sliding sleeve 241 to slide upward through the resistance between the flue gas and the blades 242 until the liquid outlet secondary hole 2313 is opened to allow the lime slurry to be discharged from the liquid outlet secondary hole 2313. In this embodiment, the sliding sleeve 241 is made of a lightweight material such as polycarbonate (PC), or directly from high-temperature resistant glass, which can be hollow inside and open at the bottom. The blades 242 are bonded to the outer wall, and the internal structure is bonded to the interior, ensuring that the overall weight of the sliding sleeve 241 is sufficient to support the high-velocity flue gas. An annular cavity 243 is recessed around the inner wall of the sliding sleeve 241 facing the liquid outlet pipe 231. Annular raised rings are formed on the inner wall of the sliding sleeve 241 above and below the annular cavity 243. The side of the raised ring facing the liquid outlet pipe 231 is hemispherical and slides against the outer wall of the liquid outlet pipe 231, achieving a certain degree of sealing between the two raised rings. A linear bearing (not shown) can be provided on the inner side wall of the sleeve 241, so that the liquid outlet pipe 231 slides through the linear bearing, thereby achieving sliding fit between the sleeve 241 and the liquid outlet pipe 231. The presence of the linear bearing should not affect the sealing of the convex ring and the arrangement of the annular cavity 243. A rotary bearing (not shown) is sleeved on the linear bearing. The linear bearing is fixedly connected to the inner ring portion of the rotary bearing, while the sleeve 241 is fixedly connected to the outer ring portion of the rotary bearing. This allows the sleeve 241 to slide vertically relative to the liquid outlet pipe 231 according to the linear bearing while being able to rotate about the central axis relative to the linear bearing and the liquid outlet pipe 231. The blade 242 has a flat section 2421 extending laterally from the top of the sleeve 241 and a curved section 2422 that bends and tilts from the flat section 2421 toward the side of the first nozzle 232. The blades 242 are distributed in a circular array and are spiral-shaped, so that when the flue gas airflow reaches a certain power, it contacts the flat section 2421 of the blade 242 and pushes the sleeve 241 upward until the annular cavity 243 is connected to the liquid outlet secondary hole 2313. The airflow power of the flue gas can also cooperate with the curved section 2422 to push the blade 242 to move to a certain extent, causing the sleeve 241 to rotate.It should be noted that while the curved segments 2422 causing the sleeve 241 to rotate may somewhat affect the coordination of the airflow with the flat segments 2421, when the airflow dynamics are sufficient, the sleeve 241 can be simultaneously lifted and rotated. The presence of the flat segments 2421 and the curved segments 2422 can also disrupt the direction of the airflow to a certain extent, thereby increasing the residence time and direction of the flue gas, thereby increasing the amount of reaction between sulfur dioxide in the flue gas and the lime slurry, and significantly improving the desulfurization and purification effect. In another embodiment, the blades 242 may include only the flat segments 2421 to ensure the upward movement of the sleeve 241.

[0033] In this embodiment, a plurality of interconnected annular cavities 243 are formed on the outer wall of the sleeve 241, each oriented toward a different flow channel 244. Each flow channel 244 is arranged in an annular array on the sleeve 241. Each flow channel 244 can be positioned at the same height, or each flow channel 244 can be bent toward different heights at its end away from the liquid outlet pipe 231. Each flow channel 244 is arc-shaped and spirally distributed. A second nozzle 245 is provided at the end of each flow channel 244 away from the liquid storage pipe. The direction in which the lime slurry is sprayed from the second nozzle 245 is within a 45° angle of the tangent line between the output point of the flow channel 244 and the sleeve 241. This creates centrifugal force when discharging the lime slurry, increasing the output pressure of the lime slurry. This ensures that the lime slurry passing through the second nozzle 245 is sprayed more effectively, with sufficient pressure and a sufficient spray range, thereby increasing the output of the lime slurry without increasing the number of sprays 23. Preferably, the number of flow channels 244 is consistent with the number of blades 242. Each curved segment 2422 may be provided with at least one flow channel 244. Therefore, the flow channels 244 may be provided in at least one group, with each group of flow channels 244 being vertically disposed within the sleeve 241 and parallel to one another. Each curved segment 2422 intersects with the injection direction of the lime slurry output from each second nozzle 245, so that a portion of the lime slurry output from the flow channel 244 can be injected onto the curved segment 2422, thereby changing the direction of the portion of the lime slurry and causing it to collide with the curved segment 2422, further dispersing it and thereby increasing the distribution range of the lime slurry. Preferably, a connecting block 2461 is fixedly mounted on the end of the liquid outlet pipe 231 near the first nozzle 232. The connecting block 2461 is provided with a first bearing 2462 that connects to the sleeve 241, enabling the sleeve 241 to rotate relative to the liquid outlet pipe 231. The first bearing 2462 is coaxial with the liquid outlet pipe 231, and its inner ring is fixedly connected to the liquid outlet pipe 231. The sleeve 241 and the first bearing 2462 are not connected and are independent of each other. A plurality of grooves 2463 are recessed on the side of the sleeve 241 facing the connecting block 2461. Specifically, there are at least three grooves 2463, each arranged in a circular array around the liquid outlet pipe 231.An elastic member 2464 is vertically arranged in each groove 2463. The elastic member 2464 can be a spring. The two ends of the elastic member 2464 are respectively connected to the inner wall of the groove 2463 and the outer ring of the first bearing 2462, so that the elastic member 2464 and the sleeve 241 can rotate synchronously relative to the first bearing 2462. The spring is made of elastic metal with a small diameter such as 0.5 mm. When the sleeve 241 contacts the first bearing 2462, the spring is in a compressed state (or normal state). When the smoke is sufficient to push the sleeve 241 to move, the spring gradually stretches with the movement of the sleeve 241, and is in a normal state (or stretched state) when the annular cavity 243 is against its liquid outlet secondary hole 2313. When in the normal state, the spring cooperates with the smoke to slightly support the sleeve 241. When in the stretched state, the spring can pull the sleeve 241 to a certain extent. It should be noted that a hemispherical rolling groove 2411 may be provided on the top of the sliding sleeve 241, and a spherical connecting end 2314 may be provided on the top of the second tube section 2312 of the liquid outlet pipe 231. When the annular cavity 243 of the sliding sleeve 241 is aligned with the secondary liquid outlet hole 2313, the connecting end 2314 is located within the rolling groove 2411. The outer surface of the connecting end 2314 is smooth, thereby restricting the sliding sleeve 241 from further movement and affecting the output of the lime slurry from the secondary liquid outlet hole 2313. In another embodiment, the spring may not be connected to the first bearing 2462.

[0034] In this embodiment, the cyclone portion 3 includes a first connecting plate 31 sealed and connected to the inner cavity of the tower body 1 and a plurality of boosters 32 evenly distributed on the bottom surface of the first connecting plate 31. A through hole is vertically opened on the first connecting plate 31 at a position corresponding to each booster 32. Each booster 32 is connected to the through hole in the vertical direction to relatively penetrate the first connecting plate 31. The booster 32 is used to change the airflow direction when the flue gas passes through, increase the contact between the flue gas and the air, thereby ensuring that the calcium sulfite generated after the reaction with the lime slurry is oxidized into calcium sulfate, thereby achieving the purpose of desulfurization.

[0035] In the content defined in this embodiment, the first connecting plate 31 is a circular sheet structure, and the enhancer 32 includes an outer tube 321 connected to the first connecting plate 31 and vertically extending therethrough, and a spoiler 322 arranged in the outer tube 321 and spirally distributed. The outer tube 321 is connected to the corresponding through hole so that the flue gas after the reaction with the lime slurry passes through the outer tube 321 and through the hole. The spoiler 322 collides with the flue gas when passing through and changes the direction of the airflow, causing the flue gas to form turbulence and increase the residence time, reducing the flow rate, and thereby allowing it to be more fully mixed with the air. Preferably, the booster 32 further includes at least one middle tube 323 and an inner tube 324 coaxially and spaced apart from each other on the inner side of the outer tube 321 to divide the outer tube 321 into at least two annular turbulence chambers. In this embodiment, there is one middle tube 323, with a turbulence chamber formed between the middle tube 323 and the outer tube 321, and between the middle tube 323 and the inner tube 324. If there are two or more middle tubes 323, a turbulence chamber is also formed between two adjacent middle tubes 323. Each turbulence chamber has a through hole that passes through the first connecting plate 31. The spoilers 322 are arranged in several groups corresponding to the turbulence chambers and are spirally arranged in each turbulence chamber. The outer tube 321, the middle tube 323, and the inner tube 324 are connected by the spoilers 322. Each spoiler 322 is tilted relative to the vertical direction to achieve a turbulence effect.

[0036] In this embodiment, the demister 5 uses an existing structure, and may have a plurality of bent demister plates or a demister pipe with a plurality of alternately inclined baffles disposed therein.

[0037] In this embodiment, the second spray part 4 has the same structure as the first spray part 2 . The second spray part 4 can spray lime slurry or air to increase the amount of oxygen in the tower body 1 .

[0038] One embodiment of the high-efficiency desulfurization tower of the present invention works as follows: the flue gas enters the inner cavity of the tower body 1 through the smoke inlet 11, and the first spray part 2 sprays lime slurry through the first nozzle 232. The flue gas floats upward and passes through the first spray part 2, so that the sulfur dioxide in the flue gas reacts with the lime slurry to form calcium sulfite. The sliding sleeve 241 cooperates according to the airflow dynamics of the flue gas. Subsequently, the flue gas passes through the swirl part 3 and contacts with the air in the turbulent cavity to oxidize the calcium sulfite into calcium sulfate. Then, the flue gas continues to rise and passes through the injection area of ​​the second injection part. Finally, the water vapor in the flue gas is removed through the demister 5, thereby completing the preliminary desulfurization.

Claims

1. A high-efficiency desulfurization tower, comprising a tower body with a smoke inlet at the bottom, wherein a first spraying portion, a swirl portion, and a demister are sequentially arranged in the tower body from bottom to top, characterized in that: The first spraying part includes a main pipe connected to the external lime slurry, a plurality of branch pipes connected to the main pipe and arranged in a tree shape relative to the main pipe, a plurality of nozzles connected to and connected to the branch pipes, and a spray adjustment part provided on each nozzle, wherein the spray adjustment part can change the spraying of the lime slurry according to the change of the flue gas flow; The nozzle includes a liquid outlet pipe having one end connected to a corresponding branch pipe and a first nozzle connected to the other end of the liquid outlet pipe. The liquid outlet pipe extends downward in a vertical direction, and a liquid outlet secondary hole is formed through the side wall of the liquid outlet pipe. The spray adjustment part is slidably mounted on the liquid outlet pipe in the vertical direction to open and close the liquid outlet secondary hole. The spray regulating portion includes a sleeve that is slidably mounted on the liquid outlet pipe in a vertical direction, and blades formed on the sleeve and distributed in a spiral pattern. The sleeve is made of a lightweight material, and an annular cavity is recessed around the inner side wall of the sleeve facing the liquid outlet pipe. A plurality of interconnected annular cavities facing different flow channels are formed on the outer side wall of the sleeve. The blades have a flat section extending laterally and an arc section that bends and tilts from the flat section toward the first nozzle. When the flue gas reaches a certain pressure, the sleeve is pushed upward by contact with the flat section of the blade until the annular cavity connects to the secondary liquid outlet hole. The sliding sleeve is rotatably sleeved on the liquid outlet pipe. Each of the flow channels is arc-shaped and spirally distributed. A second nozzle is provided on one end of each of the flow channels away from the liquid outlet pipe.

2. The high-efficiency desulfurization tower according to claim 1, characterized in that: Each of the curved arc sections intersects with a spraying direction of the lime slurry output from each second nozzle.

3. The high-efficiency desulfurization tower according to claim 2, characterized in that: A connecting block is provided on one end of the liquid outlet pipe close to the first nozzle, and a first bearing is provided on the connecting block that is connected to the sliding sleeve so that the sliding sleeve can rotate relative to the liquid outlet pipe. A plurality of grooves are concavely provided on the side surface of the sliding sleeve facing the connecting block, and an elastic member is vertically provided in each of the grooves. The two ends of the elastic member are respectively connected to the inner wall of the groove and the first bearing, and the elastic member and the sliding sleeve rotate synchronously with respect to the first bearing.

4. The high-efficiency desulfurization tower according to claim 3, characterized in that: The swirl part includes a first connecting plate sealed and connected to the inner cavity of the tower body and a plurality of enhancers evenly distributed on the bottom surface of the first connecting plate. Each enhancer passes through the first connecting plate in the vertical direction. The enhancer is used to change the direction of the airflow when the flue gas passes through.

5. The high-efficiency desulfurization tower according to claim 4, characterized in that: The booster comprises an outer tube connected to the first connecting plate and penetrating vertically, and several interference flow sheets arranged in the outer tube and distributed in a spiral shape.

6. The high-efficiency desulfurization tower according to claim 5, characterized in that: The amplifier further includes at least one middle tube and an inner tube coaxially and spaced apart from each other inside the outer tube to divide the outer tube into at least two annular flow-turbulating chambers, each of the flow-turbulating chambers passes through the first connecting plate, and the spoilers are arranged in a plurality of groups corresponding to the flow-turbulating chambers and are spirally arranged in each flow-turbulating chamber.

7. The high-efficiency desulfurization tower according to claim 1, characterized in that: A second spray portion having the same structure as the first spray portion is provided between the cyclone portion and the demister.

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