A tail gas absorber

Abstract

The application provides a tail gas absorption tower, relates to the technical field of tail gas treatment and comprises a tower body, a filler layer one and a spraying pipe. A rotating shaft is rotationally connected in the tower body, the filler layer one is installed on the rotating shaft, the lower part of the filler layer one is provided with a partition plate, a plurality of guide plates are obliquely arranged on the inner wall of the tower body, the upper part of the guide plate is connected with an annular baffle, and the rotating shaft is driven by a rotating motor. A plurality of cyclone plates are circumferentially and intervaliy installed on the rotating shaft, the inner wall of the tower body is provided with a filler layer two which is rotationally connected with the cyclone plate, and the cyclone plate is connected with a cyclone baffle. The tail gas forms a circuitous path before entering the filler layer one, so that the contact time of the tail gas with the absorbent on the filler layer one is increased. The cyclone plate rotates to generate downward airflow resistance, so that the ascending speed of the tail gas is delayed, the residence time of the tail gas between the cyclone plates and in the filler layer two is prolonged, the absorbent can fully contact with the tail gas, and the situation that the pollutants in the tail gas are not fully absorbed is reduced.

Description

Technical Field

[0001] This invention relates to the field of exhaust gas treatment technology, and more specifically to an exhaust gas absorption tower. Background Technology

[0002] A tail gas absorption tower is an environmental protection device used in industrial production to treat waste gas. It primarily removes pollutants from the exhaust gas through absorption, adsorption, or chemical reactions, ensuring that the emitted gases meet environmental standards. Tail gas absorption towers are used in various fields such as chemical engineering, liquid crystal manufacturing, power generation, pharmaceuticals, metallurgy, and brewing.

[0003] A tail gas absorption tower removes pollutants from the tail gas through the physical dissolution or chemical reaction of the absorbent with the pollutants. The main structure of a tail gas absorption tower includes the tower body, inlet, spray system, packing layer, demister layer, outlet, and storage tank. The tail gas enters the tower through the inlet at the bottom and flows upwards. The absorbent is sprayed downwards from the top of the tower through the spray system, forming a liquid film in the packing layer. The packing layer is filled with inert packing material, the surface of which can adhere to the absorbent. The tail gas contacts the absorbent in the packing layer, and the pollutants are absorbed. The purified gas then passes through the demister layer to remove droplets. The demister layer consists of wire mesh or baffles, used to separate the droplets entrained in the tail gas, preventing absorbent loss or secondary pollution. The purified gas is discharged from the outlet located at the top of the tower, and the waste liquid containing pollutants is collected in the storage tank at the bottom of the tower.

[0004] For example, patent application CN119499821A discloses a tail gas absorption tower, which includes a shell, an inlet pipe, a spray frame, and nozzles. The shell has an absorption chamber. One end of the inlet pipe extends out of the absorption chamber and connects to an external spray liquid storage tank, while the other end extends into the absorption chamber and is rotatably connected to the cavity of the spray frame. The inner wall of the cavity has several spiral surfaces, and several nozzles are evenly distributed on the spray frame. When the spray liquid enters the cavity through the inlet pipe, it impacts the spiral surfaces. Due to the impact force, the spray frame begins to rotate around the inlet pipe, thereby achieving multi-angle spraying of the spray liquid within the absorption chamber. The tail gas enters the shell through the air inlet at the bottom of the shell, comes into contact with the spray liquid, removes pollutants from the tail gas, and achieves the effect of purifying the tail gas.

[0005] However, when treating exhaust gas, the aforementioned exhaust gas absorption tower suffers from insufficient residence time within the tower due to the excessively rapid upward velocity of the exhaust gas. This results in inadequate gas-liquid contact, preventing the effective absorption or reaction of some pollutants and thus reducing purification efficiency. If harmful substances remain in the exhaust gas, this incomplete absorption necessitates secondary treatment, leading to overall low treatment efficiency. Summary of the Invention

[0006] In view of this, the present invention provides a tail gas absorption tower, which solves the technical problem that some pollutants in the tail gas cannot be effectively absorbed or reacted due to the short contact time between the tail gas and the absorbent in existing absorption towers.

[0007] To solve the above-mentioned technical problems, the present invention provides a tail gas absorption tower, including a tower body, a packing layer 1 disposed in the tower body, and a spray pipe; a rotating shaft is rotatably connected to the middle part of the tower body, the packing layer 1 is installed on the rotating shaft, a baffle is provided at the lower part of the packing layer 1, a gap 1 is left between the packing layer 1 and the inner wall of the tower body, a plurality of guide plates rotatably connected to the packing layer 1 are inclinedly disposed on the inner wall of the tower body within the gap 1, and an annular baffle is connected to the upper part of the guide plates; the rotating shaft is driven by a rotary motor.

[0008] Multiple swirl plates are installed circumferentially on the rotating shaft. The swirl plates can blow the airflow inside the tower downward. A gap 2 is left between the swirl plates and the inner wall of the tower. A packing layer 2 that is rotatably connected to the swirl plates is provided on the inner wall of the tower and located in the gap 2. A swirl baffle is connected above the swirl plates.

[0009] By employing the above technical solution, a rotary motor drives a rotating shaft, which in turn rotates the first packing layer and the swirl plates. The exhaust gas to be treated enters the tower body and rises. Due to the obstruction of the baffles in the first packing layer, the exhaust gas enters the gap between two adjacent guide plates. Under the obstruction of the baffles and the guidance of the guide plates, the exhaust gas enters the first packing layer and continues to rise within the tower body's cavity. When the exhaust gas rises to below the second packing layer within the tower body's cavity, the swirl plates, driven by the rotating shaft, rotate and blow the airflow downwards, thus prolonging the exhaust gas's ascent time. The swirl baffles above the swirl plates obstruct the exhaust gas, allowing it to enter the gap between two adjacent swirl plates and then into the second packing layer. The spray pipes spray absorbent downwards, which falls onto the first and second packing layers and comes into contact with the exhaust gas, absorbing the pollutants and thus purifying the exhaust gas.

[0010] In this invention, the first packing layer rotates with the shaft. Combined with the guidance of the guide plate and the baffle plate, the exhaust gas forms a detour path before entering the first packing layer, increasing the contact time with the absorbent on the first packing layer. At the same time, the rotation of the swirl plate generates downward airflow resistance, slowing down the upward speed of the exhaust gas. Combined with the obstruction of the swirl baffle, this helps to prolong the residence time of the exhaust gas between the swirl plates and in the second packing layer, allowing the absorbent to fully contact the exhaust gas, thereby helping to reduce the situation where pollutants in the exhaust gas are not fully absorbed.

[0011] Furthermore, the downward airflow generated by the rotation of the swirl plate in this invention flows in the opposite direction to the natural upward flow of the exhaust gas, forming a forced airflow circulation. This circulation causes the exhaust gas to flow repeatedly within the tower, increasing the number of times it comes into contact with the absorbent, which helps to prolong the reaction time, improves the absorption effect, and thus helps to remove pollutants from the exhaust gas more effectively.

[0012] Preferably, a baffle ring is provided below the swirl plate. The baffle ring is located below the second packing layer and has multiple vent holes. The exhaust gas can enter the second packing layer through the vent holes or the gap between two adjacent swirl plates.

[0013] By adopting the above technical solution, after the exhaust gas impacts the baffle ring during its ascent, it will not concentrate and pass through a single point, but will instead disperse more evenly. Part of it will pass through the vent holes, while another part will pass through the gap between two adjacent swirl plates. This uniform distribution facilitates sufficient contact between the exhaust gas and the packing layer, thereby reducing uneven absorption caused by excessive or insufficient local airflow and improving the absorption effect of the absorbent on pollutants in the exhaust gas.

[0014] Preferably, multiple spray pipes are installed above both the first and second packing layers, and the spray pipes are equipped with multiple nozzles. The spray pipes are connected to the storage tank containing the absorbent through pipes.

[0015] By adopting the above technical solution, the absorbent stored in the storage tank enters the spray pipe through a pipeline and is sprayed out from the nozzle. The absorbent is sprayed directly from above the packing layer, covering the packing layer area. After being sprayed from above, part of the absorbent directly encounters and reacts with the rising exhaust gas in the cavity of the tower; the other part adheres to the surface of packing layer one and packing layer two, forming a stagnant liquid film. When the exhaust gas flows through packing layer one and packing layer two, it comes into contact with the liquid film, which helps to increase the probability of pollutants being absorbed or reacted.

[0016] Because spray pipes are installed above both packing layer one and packing layer two, the exhaust gas will pass through the fully sprayed packing layer one and packing layer two in succession during its ascent, allowing the exhaust gas to come into contact with the absorbent multiple times during its ascent. This increases the chances of reaction between the absorbent and the exhaust gas, thereby helping to improve the exhaust gas treatment effect.

[0017] Preferably, the rotating shaft is a hollow structure, the packing layer two is slidably connected to the inner wall of the tower body, a slide rod is slidably connected above the rotating shaft, the swirl plate is installed on the slide rod, and a linear drive for driving the slide rod to rise and fall is provided inside the rotating shaft.

[0018] By employing the above technical solution, a linear actuator drives the slide bar to rise and fall, which in turn moves the swirl plate and the second packing layer to rise and fall, thereby adjusting the distance between the first and second packing layers. The composition and pollutant concentration of exhaust gases from different sources will vary. When the exhaust gas flow rate is large and the pollutant concentration is high, the distance between the first and second packing layers can be appropriately increased to provide space for the exhaust gas to rise within the tower. This facilitates the frequency and reaction time of contact between the exhaust gas and the absorbent during its ascent, allowing the absorbent to react more fully with the pollutants and effectively remove high-concentration or difficult-to-treat pollutants. When the exhaust gas flow rate is small and the pollutant concentration is low, the distance between the first and second packing layers can be reduced to decrease ineffective space and improve the efficiency of exhaust gas treatment.

[0019] In addition, the distance between packing layer one and packing layer two is adjustable, which facilitates the cleaning of the tower body and the replacement of packing layer one and packing layer two.

[0020] Preferably, multiple liquid inlet pipes are connected on the tower body between the first packing layer and the second packing layer. The end of each liquid inlet pipe is connected to a hollow connecting cylinder. A plug that can seal the liquid inlet pipe is hinged inside the connecting cylinder. A return spring is connected between the connecting cylinder and the plug. The plug has a through hole that can communicate with the liquid inlet pipe. The plug is connected to a nozzle that can extend into the tower body. The through hole communicates with the nozzle. The nozzle has multiple spray holes. An opening is opened on the side of the connecting cylinder near the tower body axis. The nozzle passes through the opening. The liquid inlet pipe is connected to a storage tank containing absorbent. When the linear actuator drives the slide bar to move down, the retaining ring can drive the nozzle to deflect, causing the plug to seal the liquid inlet pipe.

[0021] By adopting the above technical solution, when the exhaust gas flow rate is large and the pollutant concentration is high, the baffle ring and the second packing layer are located at the top of the tower body. Under the action of the return spring, the nozzle extends into the interior of the tower body. The axis of the nozzle is perpendicular to the axis of the tower body. The nozzle, through hole and liquid inlet pipe are all connected. The absorbent is sprayed through multiple nozzles on the nozzle into the area between the first packing layer and the second packing layer. The supplemented absorbent comes into contact with the exhaust gas rising in this area and absorbs the pollutants in the exhaust gas.

[0022] When the exhaust gas flow rate is low and the pollutant concentration is low, the linear actuator drives the retaining ring and packing layer two to move downwards. During the downward movement, the retaining ring contacts the nozzle and overcomes the spring force of the return spring, causing the nozzle to deflect downwards. Ultimately, the axis of the nozzle is made parallel to the axis of the tower body. The nozzle drives the plug to deflect synchronously, causing the plug to seal the liquid inlet pipe, preventing absorbent from flowing out of the spray pipe. This invention allows for flexible adjustment of the spray method according to the composition, concentration, and treatment volume of the exhaust gas, reducing absorbent waste and costs while achieving the required purification effect.

[0023] Preferably, along the radial direction of the tower body, multiple nozzles are arranged at intervals on the circumferential direction of the inner wall of the tower body to form nozzle groups; along the axial direction of the tower body, multiple nozzle groups are provided on the inner wall of the tower body.

[0024] By adopting the above technical solution, multiple nozzles in a single nozzle group are distributed circumferentially along the inner wall of the tower, which can spray absorbent from the surrounding area of ​​the tower to the central area, which is conducive to the full contact between absorbent and exhaust gas.

[0025] Multiple nozzle groups are installed along the axial direction of the tower body, enabling multi-layer spraying in the area between the first and second packing layers. When the exhaust gas flow rate is large, multiple nozzle groups can operate simultaneously, which helps to prolong the contact time between the exhaust gas and the absorbent, thus effectively removing pollutants from the exhaust gas. Simultaneously, during the downward movement of the baffle ring and the second packing layer, some nozzle groups can be closed, allowing for flexible adjustment of the spraying process.

[0026] Preferably, the baffle plate is provided with a plurality of scrapers that can abut against the upper end surface of the packing layer, and the scrapers can scrape off the deposits on the packing layer.

[0027] By adopting the above technical solution, since the first packing layer rotates with the shaft, while the first scraper and the baffle are fixed inside the tower body, the first scraper and the first packing layer can move relative to each other, allowing the first scraper to scrape off the deposits on the surface of the first packing layer. During long-term operation, pollutants in the exhaust gas and reaction products of the absorbent may form deposits on the surface of the first packing layer. If not cleaned in time, these deposits will clog the pores of the first packing layer, reducing the effective contact area between the exhaust gas and the absorbent, leading to a decrease in absorption efficiency. The rotation of the first scraper with the baffle and its ability to scrape off deposits helps to keep the pores of the first packing layer open, thus facilitating the contact between the exhaust gas and the absorbent and maintaining stable adsorption and reaction capacity.

[0028] Preferably, the swirl baffle is provided with a plurality of scrapers II that can abut against the upper end face of the packing layer II, and the scrapers II can scrape off the deposits on the packing layer II.

[0029] By adopting the above technical solution, the rotating shaft drives the swirl plate, swirl baffle and scraper two to move. The packing layer two is rotatably connected to the swirl plate, so that the scraper two and the packing layer two can move relative to each other. This allows the scraper two to scrape off the deposits on the surface of the packing layer two, which helps to reduce the blockage of the pores of the packing layer two by the deposits. This makes it easier for the exhaust gas to come into contact with the absorbent through the packing layer two, maintaining stable adsorption and reaction capacity.

[0030] Preferably, a guide tube is installed inside the tower body, the packing layer is located inside the guide tube, a baffle is installed at the upper end of the guide tube, and multiple guide tubes are installed at intervals on the inner wall of the guide tube.

[0031] By adopting the above technical solution, the guide tube has a cylindrical structure, which can concentrate the rising exhaust gas inside the guide tube, allowing the exhaust gas to pass through the gap between the two guide plates and enter the packing layer one, which is beneficial to the contact time between the exhaust gas and the absorbent on the packing layer one.

[0032] Preferably, a demister is provided at the top of the tower body, an air outlet is provided above the demister on the tower body, and an air inlet is provided below the packing layer 1 on the tower body.

[0033] By adopting the above technical solution, after the exhaust gas enters the tower body from the inlet, it moves from bottom to top. After contacting the absorbent sprayed inside the tower body, the pollutants in the exhaust gas are absorbed. The purified gas is discharged from the outlet after the liquid droplets are removed by the demister.

[0034] The beneficial effects of the above-described technical solution of the present invention are as follows:

[0035] 1. The first packing layer of the present invention rotates with the rotating shaft. Combined with the guidance of the guide plate and the baffle plate, the exhaust gas forms a detour path before entering the first packing layer, increasing the contact time between the exhaust gas and the absorbent on the first packing layer. At the same time, the rotation of the swirl plate generates downward airflow resistance, which slows down the upward speed of the exhaust gas. Combined with the obstruction of the swirl baffle, it helps to prolong the residence time of the exhaust gas between the swirl plates and in the second packing layer, so that the absorbent can fully contact the exhaust gas, thereby helping to reduce the situation where pollutants in the exhaust gas are not fully absorbed.

[0036] 2. Spray pipes are provided above both the first and second packing layers of the present invention. During the upward process, the exhaust gas will pass through the first and second packing layers that are fully sprayed, allowing the exhaust gas to come into contact with the absorbent multiple times during the upward process. This increases the chance of reaction between the absorbent and the exhaust gas, thereby helping to improve the exhaust gas treatment effect.

[0037] 3. The distance between the first packing layer and the second packing layer of the present invention is adjustable, and a nozzle capable of spraying absorbent is provided between the first packing layer and the second packing layer. The distance between the first packing layer and the second packing layer can be adjusted and the opening and closing of the nozzle can be controlled according to the composition, concentration and treatment volume of the exhaust gas, so as to reduce the waste of absorbent and reduce costs while achieving the required purification effect. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the tail gas absorption tower of the present invention;

[0039] Figure 2 This is a bottom view of the exhaust gas absorption tower of the present invention;

[0040] Figure 3 for Figure 2 Sectional view at point AA;

[0041] Figure 4 This is a vertical cross-sectional view of the first packing layer, the second packing layer, and the tower body of the present invention.

[0042] Figure 5 This is a bottom view of the swirl plate and baffle ring of the present invention;

[0043] Figure 6 This is a schematic diagram of the connection between the liquid inlet pipe, the nozzle, and the connecting cylinder of the present invention.

[0044] Figure 7 This is a sectional view of the mounting groove of the present invention along the vertical direction;

[0045] Figure 8 This is a top view of the plug and hinge shaft of the present invention.

[0046] In the diagram: 1. Tower body; 11. Demister; 12. Air outlet; 13. Air inlet; 14. Spray pipe; 15. Base plate; 16. Support; 17. Rotary motor; 2. Packing layer one; 21. Baffle plate; 3. Packing layer two; 4. Rotating shaft; 41. Sliding rod; 5. Guide cylinder; 51. Baffle plate; 52. Guide plate; 53. Scraper one; 6. Swirl plate; 61. Swirl baffle; 62. Scraper two; 63. Baffle ring; 64. Vent hole; 7. Liquid inlet pipe; 71. Connecting cylinder; 711. Opening; 72. Hinge shaft; 8. Mounting groove; 81. Plug; 82. Return spring; 83. Through hole; 84. Spray pipe; 841. Spray hole. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will be described in conjunction with the embodiments of the present invention. Figures 1-8 The technical solutions of the embodiments of the present invention will be clearly and completely described.

[0048] Example

[0049] This embodiment provides a tail gas absorption tower, such as Figure 1 and Figure 3 As shown, it includes tower body 1, packing layer 1 2, packing layer 2 3 and spray pipe 14.

[0050] like Figure 2 and Figure 3 As shown, packing layer 1, packing layer 2, and spray pipe 14 are all installed inside the tower body 1, with packing layer 1 located below packing layer 2.

[0051] like Figure 2 and Figure 3As shown, a demister 11 is installed above the second packing layer 3 inside the tower body 1. An air outlet 12 is installed above the demister 11 on the tower body 1, and an air inlet 13 is installed below the first packing layer 2 on the tower body 1. That is, from bottom to top, the tower body 1 consists of an air inlet 13, a first packing layer 2, a second packing layer 3, a demister 11, and an air outlet 12.

[0052] like Figure 3 As shown, a cavity is left between packing layer 2 and packing layer 3. Multiple spray pipes 14 are installed above both packing layers 2 and 3. These spray pipes 14 are arranged at intervals along the circumference of the inner wall of the tower body 1, and their axes are perpendicular to the axis of the tower body 1. Each spray pipe 14 is equipped with multiple nozzles and is connected to a storage tank containing the absorbent via a pipe.

[0053] like Figure 2 and Figure 3 As shown, a rotating shaft 4 is rotatably connected to the middle part of the tower body 1, and the axis of the rotating shaft 4 is parallel to the axis of the tower body 1. The tower body 1 has a base plate 15, and the rotating shaft 4 passes through the base plate 15 and is rotatably connected to the base plate 15. A bracket 16 is installed below the base plate 15, and a rotary motor 17 that drives the rotating shaft 4 is also provided below the base plate 15. The output shaft of the rotary motor 17 is connected to the rotating shaft 4 by a synchronous belt drive, which is prior art and will not be described in detail.

[0054] like Figure 3 and Figure 4 As shown, the packing layer 2 is cylindrical, and the rotating shaft 4 passes through the packing layer 2, with the packing layer 2 fixedly installed on the rotating shaft 4. A baffle 21 is provided at the lower part of the packing layer 2, and a gap 1 is left between the packing layer 2 and the inner wall of the tower body 1. A guide cylinder 5 is fixedly installed on the inner wall of the tower body 1 within the gap 1, and the packing layer 2 is located inside the guide cylinder 5. An annular baffle 51 is installed at the upper end of the guide cylinder 5, and the baffle 51 and the packing layer 2 are rotatably connected.

[0055] like Figure 4 As shown, multiple guide plates 52 are inclinedly provided on the inner wall of the guide cylinder 5 and located within the gap 1. The multiple guide plates 52 are distributed at intervals around the periphery of the packing layer 2.

[0056] like Figure 4 As shown, multiple scrapers 53 are connected radially at intervals above the baffle plate 51 along the packing layer 2, and the scrapers 53 abut against the upper end face of the packing layer 2. The rotary motor 17 drives the rotating shaft 4 to rotate, and the rotating shaft 4 drives the packing layer 2 to rotate. Since the baffle plate 51 and the scrapers 53 are fixed, the scrapers 53 and the packing layer 2 can move relative to each other, and the scrapers 53 can scrape off the deposits on the packing layer 2.

[0057] like Figure 4As shown, the exhaust gas rises inside the tower body 1. Due to the blocking effect of the baffle 21 of the packing layer 2, the exhaust gas enters the gap between two adjacent guide plates 52. Under the blocking effect of the baffle 51 and the guiding effect of the guide plate 52, the exhaust gas enters the packing layer 2 and then continues to rise in the cavity of the tower body 1.

[0058] like Figure 4 As shown, after the absorbent is sprayed from the spray pipe 14 above the packing layer 2, part of it directly encounters and reacts with the rising tail gas in the cavity of the tower body 1; the other part adheres to the surface of the packing layer 2 to form a stagnant liquid film. When the tail gas flows through the packing layer 2, it will come into contact with the liquid film, which helps to increase the probability of pollutants being absorbed or reacted, thereby improving the tail gas treatment effect. Since the packing layer 2 rotates with the rotating shaft 4, combined with the guidance of the guide plate 52 and the baffle plate 51, the tail gas forms a detour path before entering the packing layer 2, prolonging the contact time with the absorbent on the packing layer 2, which helps to reduce the phenomenon that some pollutants in the tail gas are not effectively absorbed or reacted.

[0059] like Figure 4 As shown, multiple swirl plates 6 are fixedly installed on the rotating shaft 4 above the packing layer 2, and the multiple swirl plates 6 are distributed at intervals around the circumference of the rotating shaft 4. The rotating motor 17 drives the rotating shaft 4 to rotate, which in turn drives the swirl plates 6 to rotate, and the swirl plates 6 can blow the airflow inside the tower body 1 downward.

[0060] like Figure 4 As shown, a swirl baffle 61 is connected above the swirl plate 6. A gap 2 is left between the swirl plate 6 and the inner wall of the tower body 1. The packing layer 2 3 is located in the gap 2. The packing layer 2 3 is slidably connected to the inner wall of the tower body 1. The swirl baffle 61 and the packing layer 2 3 are rotatably connected.

[0061] like Figure 4 As shown, the cross-section of the second packing layer 3 is annular. Multiple scrapers 62 are spaced apart on the upper part of the swirl baffle 61, and the scrapers 62 are radially distributed along the second packing layer 3. The rotating shaft 4 drives the swirl plate 6 and the swirl baffle 61 to rotate, which in turn drives the scrapers 62 to rotate. Because the second packing layer 3 and the swirl baffle 61 are rotatably connected, the scrapers 62 and the second packing layer 3 can move relative to each other, and the scrapers 62 can scrape away the deposits on the second packing layer 3.

[0062] like Figure 4 and Figure 5 As shown, a baffle ring 63 is connected below the swirl plate 6. The baffle ring 63 is located below the packing layer 2 3. The baffle ring 63 and the packing layer 2 3 are rotatably connected. The baffle ring 63 is provided with multiple vent holes 64. The exhaust gas can enter the packing layer 2 3 through the vent holes 64 or the gap between two adjacent swirl plates 6.

[0063] like Figure 4As shown, the exhaust gas rises between packing layer 2 and packing layer 3. When the exhaust gas rises below packing layer 3, the swirl plate 6 rotates under the drive of the shaft 4, blowing the airflow inside the tower body 1 downwards. This prolongs the time the exhaust gas rises, thus extending the contact time between the absorbent and the exhaust gas. The swirl baffle 61 above the swirl plate 6 blocks the exhaust gas, allowing it to enter the gap between two adjacent swirl plates 6, and then into packing layer 3. The exhaust gas then contacts the absorbent on packing layer 3, achieving purification of the exhaust gas.

[0064] like Figure 4 As shown, the rotating shaft 4 is a hollow structure, and a sliding rod 41 is slidably connected above the rotating shaft 4. The axis of the sliding rod 41 is collinear with the axis of the rotating shaft 4. The swirl plate 6 is fixedly installed on the sliding rod 41. A linear actuator (not shown in the figure) that drives the sliding rod 41 to rise and fall is provided inside the rotating shaft 4. The linear actuator is a cylinder or a hydraulic cylinder.

[0065] like Figure 4 As shown, the packing layer 3 is slidably connected to the inner wall of the tower body 1, and the packing layer 3 and the swirl baffle 61 are rotatably connected, while the swirl baffle 61 and the swirl plate 6 are fixedly connected. The linear actuator drives the slide rod 41 to rise and fall, which in turn drives the swirl plate 6 and the packing layer 3 to rise and fall.

[0066] like Figure 4 and Figure 6 As shown, multiple liquid inlet pipes 7 are connected on the tower body 1 between the first packing layer 2 and the second packing layer 3. The ends of the liquid inlet pipes 7 are connected to hollow connecting cylinders 71. The axial direction of the liquid inlet pipes 7 is perpendicular to the axial direction of the connecting cylinders 71, and both ends of the connecting cylinders 71 are sealed.

[0067] like Figure 4 and Figure 7 As shown, an installation groove 8 is provided on the inner wall of the tower body 1 at the location of the liquid inlet pipe 7. The liquid inlet pipe 7 passes through the installation groove 8, and the connecting cylinder 71 is installed in the installation groove 8.

[0068] like Figures 6-8 As shown, a plug 81, capable of sealing the inlet pipe 7, is hinged inside the connecting cylinder 71 via a hinge shaft 72. The axis of the hinge shaft 72 is parallel to the axis of the connecting cylinder 71. A return spring 82, which is a torsion spring, connects between the connecting cylinder 71 and the plug 81. The plug 81 has a through hole 83 that communicates with the inlet pipe 7. The plug 81 is connected to the nozzle 84, and the through hole 83 communicates with the nozzle 84. The nozzle 84 can extend into the tower body 1. An opening 711 is provided on the side of the connecting cylinder 71 near the axis of the tower body 1. The nozzle 84 passes through the opening 711 and can rotate 90° within the opening 711. The nozzle 84 has multiple spray holes 841. The inlet pipe 7 is connected to a storage tank containing absorbent.

[0069] like Figure 4, Figure 7 and Figure 8 As shown, when the exhaust gas flow rate is large and the pollutant concentration is high, the baffle ring 63 and the second packing layer 3 are located at the upper part of the tower body 1. Under the action of the return spring 82, the nozzle 84 extends into the interior of the tower body 1, that is, the axis of the nozzle 84 is perpendicular to the axis of the tower body 1, and the axis of the liquid inlet pipe 7 is parallel to the axis of the nozzle 84. The nozzle 84, the through hole 83, and the liquid inlet pipe 7 are all connected. The absorbent enters the nozzle 84 through the liquid inlet pipe 7 and is sprayed into the area between the first packing layer 2 and the second packing layer 3 through multiple nozzles 841 on the nozzle 84. The absorbent sprayed from the nozzles 841 comes into contact with the exhaust gas rising in this area and absorbs the pollutants in the exhaust gas.

[0070] like Figure 4 As shown, when the exhaust gas flow rate is low and the pollutant concentration is low, the linear actuator drives the slide bar 41 to move downward. The slide bar 41 drives the retaining ring 63 and the packing layer 2 3 to move downward, thereby reducing the distance between the packing layer 1 2 and the packing layer 2 3, reducing the ineffective space, and improving the efficiency of exhaust gas treatment.

[0071] like Figure 4 , Figure 7 and Figure 8 As shown, during the downward movement of the retaining ring 63, it contacts the nozzle 84 and overcomes the elastic force of the return spring 82, causing the nozzle 84 to deflect downward. Ultimately, the axis of the nozzle 84 is parallel to the axis of the tower body 1. The nozzle 84 is located in the mounting groove 8, that is, the axis of the nozzle 84 is perpendicular to the axis of the liquid inlet pipe 7. The nozzle 84 drives the plug 81 to deflect downward synchronously, so that the plug 81 seals the liquid inlet pipe 7. The liquid inlet pipe 7 is not connected to the spray pipe 14, and the absorbent will not flow out of the spray pipe 14. This reduces the waste of absorbent and reduces costs while achieving the required purification effect.

[0072] like Figure 4 and Figure 7 As shown, multiple nozzles 84 are arranged at intervals along the radial direction of the tower body 1 in the circumferential direction of the inner wall of the tower body 1 to form a nozzle group, which can spray absorbent from the surrounding area of ​​the tower body 1 to the central area, which is conducive to the full contact between absorbent and exhaust gas.

[0073] like Figure 4 and Figure 7 As shown, two nozzle assemblies are provided on the inner wall of tower body 1 along its axial direction. Multiple nozzle assemblies can also be designed as needed. The two nozzle assemblies can work simultaneously, which helps to prolong the contact time between the exhaust gas and the absorbent and improve the exhaust gas treatment effect. At the same time, during the downward movement of the baffle ring 63 and the packing layer 2 3, the upper nozzle assembly can be closed, realizing flexible adjustment of the spray from the nozzle 84 and reducing the waste of absorbent.

[0074] The implementation principle of the tail gas absorption tower in this embodiment is as follows:

[0075] The exhaust gas to be treated enters the tower body 1 through the air inlet 13. The rotary motor 17 drives the rotating shaft 4 to rotate, and the exhaust gas rises in the tower body 1. Due to the blocking effect of the baffle 21 of the packing layer 2, the exhaust gas enters the gap between two adjacent guide plates 52. Under the blocking effect of the baffle 51 and the guiding effect of the guide plate 52, the exhaust gas enters the packing layer 2 and then continues to rise in the cavity of the tower body 1.

[0076] After the absorbent is sprayed out from the spray pipe 14 above the packing layer 2, part of it directly meets and reacts with the rising tail gas in the cavity of the tower body 1; the other part adheres to the surface of the packing layer 2 to form a stagnant liquid film. When the tail gas flows through the packing layer 2, it will come into contact with the liquid film and absorb the pollutants in the tail gas.

[0077] As the exhaust gas rises between packing layer 1 (2) and packing layer 2 (3), the swirl plate 6 rotates under the drive of the rotating shaft 4, which blows the airflow in the tower body 1 downward, prolonging the time for the exhaust gas to rise and thus prolonging the contact time between the absorbent and the exhaust gas. The absorbent then absorbs the pollutants in the exhaust gas.

[0078] Because the swirl baffle 61 above the swirl plate 6 blocks the exhaust gas, the exhaust gas can enter the gap between two adjacent swirl plates 6, and then enter the packing layer 2 3. The exhaust gas comes into contact with the absorbent on the packing layer 2 3, and the purified gas is discharged from the outlet 12 after the liquid droplets are removed by the demister 11.

[0079] When the exhaust gas flow rate is large and the pollutant concentration is high, the baffle ring 63 and the second packing layer 3 are located at the upper part of the tower body 1. Under the action of the return spring 82, the nozzle 84 extends into the interior of the tower body 1. The nozzle 84 is connected to the liquid inlet pipe 7. The absorbent enters the nozzle 84 through the liquid inlet pipe 7 and is sprayed into the area between the first packing layer 2 and the second packing layer 3 through multiple nozzles 841 on the nozzle 84. The absorbent sprayed from the nozzles 841 comes into contact with the exhaust gas rising in this area and absorbs the pollutants in the exhaust gas.

[0080] When the exhaust gas flow rate is low and the pollutant concentration is low, the linear actuator drives the slide bar 41 to move downward. The slide bar 41 drives the retaining ring 63 and the packing layer 2 3 to move downward, reducing the distance between the packing layer 1 2 and the packing layer 2 3. During the downward movement, the retaining ring 63 contacts the nozzle 84 and overcomes the elastic force of the return spring 82, causing the nozzle 84 to deflect downward. The nozzle 84 drives the plug 81 to deflect downward synchronously, causing the plug 81 to seal the liquid inlet pipe 7. The liquid inlet pipe 7 is not connected to the spray pipe 14, and the absorbent will not flow out of the spray pipe 14, reducing the waste of absorbent while achieving the required purification effect.

[0081] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components.

Claims

1. A tail gas absorption tower, comprising a tower body, a packing layer disposed within the tower body, and spray pipes; characterized in that: A rotating shaft is rotatably connected to the middle part of the tower body. The first packing layer is installed on the rotating shaft. A baffle is provided at the lower part of the first packing layer. A gap is left between the first packing layer and the inner wall of the tower body. Multiple guide plates that are rotatably connected to the first packing layer are inclined on the inner wall of the tower body and located within the gap. An annular baffle is connected to the upper part of the guide plate. The rotating shaft is driven by a rotary motor. Multiple swirl plates are installed circumferentially on the rotating shaft. The swirl plates can blow the airflow inside the tower downward. A gap two is left between the swirl plates and the inner wall of the tower. A packing layer two that is rotatably connected to the swirl plates is provided on the inner wall of the tower and located in the gap two. A swirl baffle is connected above the swirl plates. A baffle ring is provided below the swirl plate. The baffle ring is located below the second packing layer. The baffle ring is provided with multiple vent holes. The exhaust gas can enter the second packing layer through the vent holes or the gap between two adjacent swirl plates. Multiple spray pipes are installed above both the first and second packing layers. Each spray pipe has multiple nozzles and is connected to a storage tank containing absorbent via a pipe. The rotating shaft is a hollow structure. The packing layer 2 is slidably connected to the inner wall of the tower body. A sliding rod is slidably connected above the rotating shaft. The swirl plate is installed on the sliding rod. A linear actuator that drives the sliding rod to rise and fall is installed inside the rotating shaft. Multiple liquid inlet pipes are connected between packing layer one and packing layer two on the tower body. The end of the liquid inlet pipe is connected to a hollow connecting cylinder. A plug that can seal the liquid inlet pipe is hinged inside the connecting cylinder. A return spring is connected between the connecting cylinder and the plug. The plug has a through hole that can communicate with the liquid inlet pipe. The plug is connected to a nozzle that can extend into the tower body. The through hole communicates with the nozzle. The nozzle has multiple spray holes. An opening is opened on the side of the connecting cylinder near the tower body axis. The nozzle passes through the opening. The liquid inlet pipe is connected to a storage tank containing absorbent. When the linear actuator drives the slide bar to move down, the retaining ring can drive the nozzle to deflect, so that the plug seals the liquid inlet pipe.

2. The tail gas absorption tower according to claim 1, characterized in that: Along the radial direction of the tower body, multiple nozzles are arranged at intervals on the circumferential direction of the inner wall of the tower body to form nozzle groups; along the axial direction of the tower body, multiple nozzle groups are provided on the inner wall of the tower body.

3. The tail gas absorption tower according to claim 2, characterized in that: The baffle plate is provided with multiple scrapers that can abut against the upper end face of the packing layer, and the scrapers can scrape off the deposits on the packing layer.

4. The tail gas absorption tower according to claim 3, characterized in that: The swirl baffle is equipped with multiple scrapers that can abut against the upper end face of the packing layer 2, and the scrapers can scrape off the deposits on the packing layer 2.

5. The tail gas absorption tower according to claim 4, characterized in that: The tower body is equipped with a guide tube, the packing layer is located inside the guide tube, the baffle is installed at the upper end of the guide tube, and multiple guide tubes are installed at intervals on the inner wall of the guide tube.

6. The tail gas absorption tower according to claim 5, characterized in that: The upper part of the tower is equipped with a demister, and an air outlet is located above the demister on the tower body. An air inlet is located below the first packing layer on the tower body.

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