Gypsum processing waste gas washing tower based on cyclone air distribution structure

Abstract

The application discloses a kind of based on the swirl cloth gas structure's gypsum processing waste gas washing tower, it is related to gypsum processing waste gas purification technical field, including washing tower body, annular spray pipe, shrinkage formula gas guide cylinder, swirl cloth gas disc, flow guide exhaust hood, circulating liquid tank and liquid collection return pipe, swirl cloth gas disc between arc swirl vane form and shrinkage formula gas guide cylinder opposite swirl ventilation gap, upper annular liquid collection tank and lower annular liquid collection tank are communicated with circulating liquid tank through liquid collection return pipe, waste gas is sequentially through spray washing, shrinkage flow guide, swirl separation and flow guide exhaust, washing liquid and be intercepted liquid drop are returned through liquid collection structure, to enhance gas-liquid contact and reduce liquid drop and gypsum dust with purified gas discharge.

Description

Technical Field

[0001] This invention relates to the field of gypsum processing waste gas purification technology, and in particular to a gypsum processing waste gas scrubbing tower based on a swirling gas distribution structure. Background Technology

[0002] During the crushing, drying, calcining, grinding and conveying of gypsum raw materials, process waste gas carrying fine gypsum dust is generated. The particle size distribution of this waste gas is relatively wide, and the fine particles are easily diffused with the airflow. If it is discharged directly without treatment, it will easily cause dust accumulation in the production area and increase the subsequent environmental protection treatment load.

[0003] Existing wet scrubbing equipment typically involves introducing dust-laden exhaust gas into a tower and spraying scrubbing liquid onto the exhaust gas using a spray device installed inside the tower. This allows dust particles to be wetted and trapped after contact with the liquid droplets. However, the flow velocity of the exhaust gas on the cross-section of the tower is prone to uneven distribution. Some gas will quickly pass through the spray zone along the area with less resistance, resulting in insufficient gas-liquid contact time and contact range. At the same time, the scrubbed gas is prone to carrying liquid droplets and fine dust that has not been fully trapped when it flows towards the exhaust port.

[0004] In addition, after the spray liquid comes into contact with the dust-laden airflow, it will form an adhering liquid on the inner wall of the tower, the flow guiding components and the surface of the airflow distribution components. If there is no liquid collection and reflux structure that matches the airflow path, the adhering liquid is easy to remain inside the equipment or be re-entrained by the high-speed airflow, thereby affecting the continuity of the washing process and the stable discharge of the purified gas. Therefore, it is necessary to invent a gypsum processing waste gas scrubbing tower based on a swirling air distribution structure to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a gypsum processing waste gas scrubbing tower based on a swirl gas distribution structure to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a gypsum processing waste gas scrubbing tower based on a swirl gas distribution structure, comprising a scrubbing tower body, a waste gas inlet, and an annular spray pipe, wherein the waste gas inlet is located on the lower side wall of the scrubbing tower body, and the annular spray pipe is located in the lower part of the scrubbing tower body and is higher than the waste gas inlet.

[0007] Furthermore, it also includes a shrink-expansion air guide tube, a lower annular liquid collection tank, and a swirl air distribution plate. The shrink-expansion air guide tube is located above the annular spray pipe, the swirl air distribution plate is located above the shrink-expansion air guide tube, and the lower annular liquid collection tank is fixed to the lower periphery of the shrink-expansion air guide tube.

[0008] Furthermore, the swirl distribution plate includes arc-shaped swirl blades, swirl air gaps, and an upper annular liquid collection groove. Multiple arc-shaped swirl blades are fixed to the swirl distribution plate and distributed circumferentially. The swirl air gaps are located between adjacent arc-shaped swirl blades and are opposite to the upper end of the expansion-contraction air guide tube. The upper annular liquid collection groove is fixed to the outer periphery of the swirl distribution plate.

[0009] Furthermore, it also includes a purified gas outlet and a flow guide exhaust hood. The purified gas outlet is located at the top of the scrubbing tower, and the flow guide exhaust hood is located above the swirl distribution plate and communicates with the purified gas outlet.

[0010] Furthermore, it also includes a circulating liquid tank and a liquid collection and return pipe, which are located outside the washing tower body. The liquid collection and return pipe is connected to the upper annular liquid collection tank, the lower annular liquid collection tank, and the circulating liquid tank.

[0011] Preferably, the radial dimensions of the upper and lower ends of the expansion-contraction air guide tube are both larger than the radial dimension of the middle part. The expansion-contraction air guide tube includes multiple arc-shaped air guide plates, which are distributed circumferentially at intervals along the lower annular liquid collection tank. The lower end of the arc-shaped air guide plate is fixed to the lower annular liquid collection tank. The middle part of the arc-shaped air guide plate is bent toward the axis of the washing tower body, and the upper part of the arc-shaped air guide plate extends away from the axis of the washing tower body.

[0012] Preferably, the expansion-contraction air guide tube further includes a longitudinal reinforcing rib, which is located on the side of the arc-shaped air guide plate facing the axis of the washing tower and fixed to the arc-shaped air guide plate. The longitudinal reinforcing rib extends between the lower end and the upper part of the arc-shaped air guide plate along the bending direction of the arc-shaped air guide plate.

[0013] Preferably, it further includes a plug-in seat, a central positioning rod, and a locking plate. The plug-in seat is located at the lower center of the expansion-contraction air guide tube. The central positioning rod is located at the lower center of the swirl air distribution plate and extends vertically. The lower end of the central positioning rod is inserted into the plug-in seat. The locking plate is located on one side of the plug-in seat and locks into the central positioning rod.

[0014] Preferably, the arc-shaped swirl blades extend from the middle of the swirl distribution plate towards the upper annular liquid collection tank, and multiple arc-shaped swirl blades bend along the same swirl direction. The width of the swirl air gap gradually increases from the middle of the swirl distribution plate towards the upper annular liquid collection tank.

[0015] Preferably, the swirl distribution plate further includes a conical cover plate and radial reinforcing ribs. The conical cover plate is located on the upper side of the swirl distribution plate, and the center of the conical cover plate is higher than the outer periphery of the conical cover plate. The arc-shaped swirl blades are fixed to the lower side of the conical cover plate. A plurality of radial reinforcing ribs are distributed at intervals along the circumference of the conical cover plate and fixed to the upper surface of the conical cover plate. The radial reinforcing ribs extend from the center of the conical cover plate to the outer periphery.

[0016] Preferably, both the lower annular liquid collecting groove and the upper annular liquid collecting groove are annular grooves with their openings facing upwards. The inner peripheral wall of the lower annular liquid collecting groove is fixed to the lower outer wall of the expansion-contraction air guide tube, and the inner peripheral wall of the upper annular liquid collecting groove is fixed to the outer peripheral wall of the swirl air distribution plate.

[0017] Preferably, the flow guide exhaust hood includes a conical guide plate, a central air inlet, and multiple diversion liquid guide plates. The conical guide plate is located in the lower part of the interior of the flow guide exhaust hood and slopes downward from the outer periphery to the center. The central air inlet is located at the center of the conical guide plate and penetrates through the conical guide plate. The multiple diversion liquid guide plates are fixed to the inner surface of the conical guide plate and are distributed circumferentially at intervals. The diversion liquid guide plates extend radially along the conical guide plate, and a liquid guiding channel is formed between adjacent diversion liquid guide plates.

[0018] Preferably, it further includes a circulation pump and a liquid guide pipe. The circulation pump is located on one side of the circulation tank, and the inlet of the circulation pump is connected to the circulation tank. The liquid guide pipe is located between the outlet of the circulation pump and the annular spray pipe. One end of the liquid guide pipe is connected to the outlet of the circulation pump, and the other end of the liquid guide pipe is connected to the annular spray pipe.

[0019] Preferably, the liquid collection return pipe includes two transverse connecting pipes, which are located at the upper and middle parts of the liquid collection return pipe, respectively. The transverse connecting pipe located at the upper part of the liquid collection return pipe is connected to the cavity of the upper annular liquid collection tank, and the transverse connecting pipe located at the middle part of the liquid collection return pipe is connected to the cavity of the lower annular liquid collection tank. The lower end of the liquid collection return pipe is connected to the interior of the circulating liquid tank.

[0020] The technical effects and advantages of this invention are as follows: 1. This invention, by sequentially arranging a contraction-expansion air guide tube, a swirl air distribution plate, and a flow guide exhaust hood above the annular spray pipe, allows the dust-laden waste gas entering from the waste gas inlet to first come into counter-current contact with the washing liquid sprayed from the annular spray pipe, and then converge and diffuse upward along the contraction-expansion air guide tube from the expansion section to the central contraction area. Subsequently, a circumferentially rotating upward airflow is formed through the swirling airflow gap between adjacent arc-shaped swirl blades. After entering the flow guide exhaust hood, the airflow direction changes again, thereby extending the flow path of the waste gas in the tower and the gas-liquid contact path, reducing the possibility of the waste gas being directly discharged along the local low-resistance area, and allowing the droplets and dust to be further separated during the swirling and turning process. 2. This invention provides a lower annular liquid collection tank on the outer periphery of the lower end of the expansion-contraction air guide tube and an upper annular liquid collection tank on the outer periphery of the swirl air distribution plate. The two liquid collection tanks are connected to the circulating liquid tank by a liquid collection return pipe. This allows the washing liquid falling along the surface of the expansion-contraction air guide tube and the droplets thrown outward at the swirl air distribution plate to enter the corresponding liquid collection tanks respectively, and then return to the circulating liquid tank by the liquid collection return pipe. At the same time, multiple diversion liquid guide plates fixed on the inner surface of the conical guide plate separate the condensate formed inside the conical guide plate into different liquid guide channels and guide it out along the predetermined discharge direction. This reduces the situation of condensate concentration, retention and re-entrainment by the airflow, thereby forming a washing liquid collection, condensate discharge and circulating liquid supply path that cooperates with the airflow separation process. 3. This invention provides longitudinal reinforcing ribs on the arc-shaped air guide plate of the expansion-contraction air guide tube and radial reinforcing ribs on the conical cover plate of the swirl air distribution plate. It also provides a plug-in seat, a central positioning rod, and a locking plate between the expansion-contraction air guide tube and the swirl air distribution plate. This allows the expansion-contraction air guide tube and the swirl air distribution plate to have a more stable shape and relative position when subjected to airflow impact and attached liquid load. At the same time, the central positioning rod is held by the locking plate after being inserted into the plug-in seat, which can form a clear axial assembly reference and facilitate separate installation and maintenance, thereby improving the assembly consistency and long-term working stability of the internal flow guiding structure. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0022] Figure 2 This is a schematic diagram of the internal structure of the washing tower body of the present invention after partial cross-section.

[0023] Figure 3 This is a front cross-sectional view of the present invention.

[0024] Figure 4 This is an exploded view of the internal structure of the present invention.

[0025] Figure 5 This is a schematic diagram of the structure of the expansion-contraction air guide tube of the present invention.

[0026] Figure 6 This is a schematic diagram of the structure of the lower side of the swirl air distribution plate of the present invention.

[0027] Figure 7 This is a schematic diagram of the upper side of the swirl air distribution plate of the present invention.

[0028] Figure 8 This is a schematic diagram of the lower side of the airflow guide exhaust cover of the present invention.

[0029] In the diagram: 1. Scrubber body; 11. Exhaust gas inlet; 12. Purified gas outlet; 13. Circulating liquid tank; 14. Liquid collection and return pipe; 15. Circulating pump; 16. Liquid guide pipe; 17. Annular spray pipe; 2. Converging-expanding air guide tube; 21. Longitudinal reinforcing rib; 22. Lower annular liquid collection tank; 23. Locking plate; 24. Insertion seat; 3. Swirl air distribution plate; 31. Arc-shaped swirl blades; 32. Swirl air gap; 33. Central positioning rod; 34. Conical cover plate; 341. Radial reinforcing rib; 35. Upper annular liquid collection tank; 4. Flow guide exhaust hood; 41. Conical guide plate; 411. Central air inlet; 42. Diversion guide plate. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] like Figures 1 to 8 As shown, the gypsum processing waste gas scrubbing tower based on the swirl gas distribution structure provided by the present invention essentially forms a shrinking and expanding flow guiding, swirl gas distribution, droplet collection and turning exhaust area in sequence on the wet spray scrubbing path, and makes the collected scrubbing liquid return to the circulating liquid tank 13 along an independent return path.

[0032] In terms of specific structural installation, the structural body can be constructed according to the inventive concept of this embodiment. For spray nozzles, ventilation grilles, flanges, seals, fasteners, inspection ports and tower bottom reflux structures that are not individually labeled, existing technologies in the field are used for configuration. This embodiment does not make any special limitations on their specific models and dimensions.

[0033] In this embodiment, the washing tower 1 is a vertically arranged hollow cylindrical structure. The interior of the washing tower 1 forms a spray washing area, a contraction and expansion air guiding area, a swirl air distribution area and a guide exhaust area from bottom to top. The exhaust gas inlet 11 is located on the lower side wall of the washing tower 1 and communicates with the interior of the washing tower 1. The purified gas outlet 12 is located at the top of the washing tower 1 and serves as the exhaust end of the treated gas. The circulating liquid tank 13 is located on the lower part of the outer side of the washing tower 1 to shorten the liquid supply and return pipelines and facilitate liquid replenishment, liquid drainage and maintenance.

[0034] The annular spray pipe 17 is located in the lower part of the scrubbing tower body 1 and is higher than the exhaust gas inlet 11. The annular spray pipe 17 extends circumferentially along the scrubbing tower body 1, so that the spray liquid can cover the main cross-section of the exhaust gas rising channel. Multiple spray nozzles without individual labels are set on the annular spray pipe 17 according to the existing spray tower structure. Each spray nozzle is connected to the inner cavity of the annular spray pipe 17 and sprays the scrubbing liquid towards the scrubbing area below, so that the exhaust gas entering from the exhaust gas inlet 11 and flowing upward forms a counter-contact with the downward moving droplets.

[0035] The circulating pump 15 is located on one side of the circulating liquid tank 13. The inlet of the circulating pump 15 is connected to the inside of the circulating liquid tank 13 through a pipeline. One end of the liquid guide pipe 16 is connected to the outlet of the circulating pump 15, and the other end of the liquid guide pipe 16 extends upward and is connected to the annular spray pipe 17. When the circulating pump 15 is working, it draws washing liquid from the circulating liquid tank 13 and delivers it to the annular spray pipe 17 through the liquid guide pipe 16. The interface between the circulating pump 15, the liquid guide pipe 16 and the annular spray pipe 17 adopts the flange shown in the figure or the conventional sealing connection method in the art to meet the requirements of disassembly and leak prevention.

[0036] The illustrated grid structure located below the annular spray pipe 17 inside the scrubbing tower 1 adopts the existing technology of a ventilation support grid. The ventilation support grid is fixed to the inner wall of the scrubbing tower 1 and retains a ventilation area for the passage of exhaust gas, so that the exhaust gas can flow from the lower part of the scrubbing tower 1 to the area where the annular spray pipe 17 is located, while providing auxiliary support for the pipes or internal components above it. This ventilation support grid is not a core improvement structure of the present invention and is not separately marked with an attached reference numeral.

[0037] The expansion-contraction air guide tube 2 is set above the annular spray pipe 17. The radial dimensions of the upper and lower ends of the expansion-contraction air guide tube 2 are larger than the radial dimension of the middle part, so that the interior of the expansion-contraction air guide tube 2 forms a gas channel that first contracts and then expands from bottom to top. After the exhaust gas enters the gas channel, it is converged and accelerated in the middle contraction area, and then dispersed in the upper expansion area after leaving the middle, thereby changing the original distribution state of the exhaust gas on the cross-section of the scrubbing tower 1 and increasing the airflow disturbance.

[0038] The expansion-contraction air guide tube 2 is composed of multiple circumferentially spaced arc-shaped air guide plates. The lower end of the arc-shaped air guide plate is fixed to the lower annular liquid collection tank 22. The middle part of the arc-shaped air guide plate bends toward the axis of the washing tower body 1, and the upper part of the arc-shaped air guide plate extends away from the axis of the washing tower body 1. Space is reserved between adjacent arc-shaped air guide plates for gas and attached liquid to pass through, so that the expansion-contraction air guide tube 2 forms a expansion-contraction channel while avoiding the formation of a completely closed liquid accumulation cavity.

[0039] The longitudinal reinforcing rib 21 is fixed on the side of the arc-shaped air guide plate facing the axis of the washing tower 1 and extends along the bending direction of the arc-shaped air guide plate. The lower end of the longitudinal reinforcing rib 21 is close to the connection area between the arc-shaped air guide plate and the lower annular liquid collection tank 22, and the upper end of the longitudinal reinforcing rib 21 extends to the upper part of the arc-shaped air guide plate to limit the excessive deformation of the arc-shaped air guide plate under the impact of airflow, the weight of the attached liquid and the vibration of the equipment, and to maintain the shape stability of the contraction area in the middle of the expansion-contraction air guide cylinder 2.

[0040] The lower annular liquid collection tank 22 is an annular tank with its opening facing upward. The lower annular liquid collection tank 22 surrounds the lower periphery of the expansion-contraction air guide tube 2 and its inner peripheral wall is fixed to the lower outer wall of the expansion-contraction air guide tube 2. The spray liquid flows downward along the surface of the arc-shaped air guide plate and enters the lower annular liquid collection tank 22. Some of the liquid that adheres to the inner wall of the washing tower 1 and flows to this area can also flow into the lower annular liquid collection tank 22, thereby forming a relatively concentrated liquid collection position at the lower end of the expansion-contraction air guide tube 2.

[0041] The plug-in seat 24 is located at the lower center of the expansion-contraction air guide tube 2. The plug-in seat 24 is held near the axis of the expansion-contraction air guide tube 2 by the support structure shown in the figure. The center positioning rod 33 is fixed at the lower center of the swirling air distribution plate 3 and extends vertically downward. When assembling the swirling air distribution plate 3, the lower end of the center positioning rod 33 is inserted into the plug-in seat 24 axially so that the swirling air distribution plate 3 and the expansion-contraction air guide tube 2 form a coaxial positioning relationship.

[0042] The locking plate 23 is located on one side of the plug-in seat 24. After the center positioning rod 33 is inserted into the plug-in seat 24 and reaches the predetermined position, the locking plate 23 and the center positioning rod 33 form a locking engagement to prevent the center positioning rod 33 from coming off upward or shifting significantly relative to the plug-in seat 24. The specific snap-fit, pressing or fastening form of the locking plate 23 adopts a conventional detachable locking structure in the art, as long as it can maintain the plug-in position of the center positioning rod 33 and the plug-in seat 24 in the working state.

[0043] The swirl distribution plate 3 is positioned above the expansion-contraction air guide tube 2. The swirl distribution plate 3 includes a conical cover plate 34 on the upper side and multiple arc-shaped swirl blades 31 on the lower side of the conical cover plate 34. The arc-shaped swirl blades 31 extend from the middle of the swirl distribution plate 3 outward and bend along the same direction of rotation. A swirl air gap 32 is formed between adjacent arc-shaped swirl blades 31, so that the exhaust gas discharged from the upper end of the expansion-contraction air guide tube 2 cannot pass directly through the swirl distribution plate 3 axially, but instead flows in a direction of rotation along the curved channel defined by the arc-shaped swirl blades 31.

[0044] The swirling air gap 32 is opposite to the upper end of the expansion-contraction air guide tube 2. The width of the swirling air gap 32 gradually increases from the middle of the swirling air distribution plate 3 to the annular liquid collection groove 35. After the exhaust gas enters the swirling air gap 32 from the middle region of the swirling air distribution plate 3, it moves outward along the arc-shaped swirling blades 31. Under the combined action of multiple arc-shaped swirling blades 31 that bend in the same direction, a rotating upward airflow with a circumferential velocity component is formed, which causes the liquid droplets in the exhaust gas and the dust captured by the liquid droplets to migrate to the outer periphery of the swirling air distribution plate 3 during the rotation process.

[0045] The center of the conical cover plate 34 is higher than its outer periphery. The lower side of the conical cover plate 34 provides a fixed carrier for the arc-shaped swirl blade 31. Multiple radial reinforcing ribs 341 are fixed on the upper surface of the conical cover plate 34. The multiple radial reinforcing ribs 341 are distributed at intervals along the circumference of the conical cover plate 34 and extend from the center of the conical cover plate 34 to the outer periphery, so as to improve the support stiffness of the conical cover plate 34 for the arc-shaped swirl blade 31 and reduce the deflection of the conical cover plate 34 under the action of airflow pressure.

[0046] The upper annular liquid collection tank 35 is an annular tank with its opening facing upward. The upper annular liquid collection tank 35 surrounds the outer periphery of the swirl gas distribution plate 3 and its inner peripheral wall is fixed to the outer peripheral wall of the swirl gas distribution plate 3. After the liquid droplets migrating to the outer periphery in the rotating airflow come into contact with the outer peripheral area of ​​the swirl gas distribution plate 3 or the inner wall of the washing tower 1, they enter the upper annular liquid collection tank 35. The attached liquid on the surface of the conical cover plate 34 can also flow into the upper annular liquid collection tank 35 along its surface that descends from the center to the outer periphery, thereby forming a concentrated liquid collection path in the swirl gas distribution area.

[0047] The guide exhaust hood 4 is set above the swirl air distribution plate 3 and located at the top of the scrubbing tower 1. The upper part of the guide exhaust hood 4 is connected to the purified gas outlet 12. A conical guide plate 41 is set in the lower part of the interior of the guide exhaust hood 4. The conical guide plate 41 is inclined downward from the outer periphery to the center. A central air inlet 411 is opened in the center of the conical guide plate 41, so that the gas treated by the swirl air distribution plate 3 enters the interior of the guide exhaust hood 4 through the central air inlet 411, and flows to the purified gas outlet 12 after adjusting the flow direction within the space defined by the conical guide plate 41.

[0048] Multiple diversion guide plates 42 are provided, which are fixed on the inner surface of the conical guide plate 41 and distributed at intervals along the circumference of the conical guide plate 41. Each diversion guide plate 42 extends radially along the conical guide plate 41, and a liquid guiding channel is formed between adjacent diversion guide plates 42. After the condensate formed inside the conical guide plate 41 comes into contact with the diversion guide plate 42, it is separated into different liquid guiding channels and guided out of the guide and exhaust hood 4 by the diversion guide plate 42 along the predetermined discharge direction, thereby reducing the concentration and retention of condensate inside the conical guide plate 41.

[0049] After leaving the expansion and contraction air guide tube 2, the gas enters the swirling air gap 32. The arc-shaped swirling blades 31 cause the gas to rotate in the same direction and diffuse outward. The liquid droplets and fine dust entrained in the gas migrate outward during the rotation and turning process and are collected by the upper annular liquid collection tank 35. Then the gas enters the guide exhaust hood 4 through the central air inlet 411 and the flow direction is adjusted under the action of the conical guide plate 41. The condensate formed inside the conical guide plate 41 is diverted and guided by multiple diversion guide plates 42 and then discharged. The treated gas is finally discharged from the purified gas outlet 12.

[0050] The bottom of the washing tower 1 is equipped with a conventional liquid collection and reflux structure shown in the figure but not individually labeled. The spray liquid that does not enter the lower annular liquid collection tank 22 and the upper annular liquid collection tank 35 is collected at the bottom of the washing tower 1 and returned to the circulating liquid tank 13 through the conventional reflux interface. This allows the main washing liquid sprayed from the annular spray pipe 17 and the attached liquid intercepted by the internal guiding structure to flow back along the corresponding paths. The liquid replenishment, sewage discharge and liquid level maintenance structure on the circulating liquid tank 13 is set up according to the existing circulating spray equipment.

[0051] Before the device is put into operation, a washing liquid that is compatible with the requirements for treating gypsum processing exhaust gas is added to the circulating liquid tank 13. Then, the circulating pump 15 is started so that the washing liquid enters the annular spray pipe 17 through the liquid guide pipe 16 and is sprayed downward from the spray nozzle. After the spraying state is stable, the dust-containing exhaust gas generated during the gypsum processing is sent into the washing tower 1 through the exhaust gas inlet 11.

[0052] After entering the scrubbing tower 1, the exhaust gas first passes upward through the ventilation support grid and enters the spray scrubbing area. The upward exhaust gas comes into counter-current contact with the downward spray droplets. The gypsum dust in the exhaust gas is wetted, collided, and adhered, and moves downward with the droplets. The gas that has undergone preliminary scrubbing continues to enter the contraction-expansion air guide 2, where it converges, accelerates, and diffuses to reduce the concentration of airflow in local areas of the tower.

[0053] After leaving the expansion and contraction air guide tube 2, the gas enters the swirling air gap 32. The arc-shaped swirling blades 31 cause the gas to rotate in the same direction and diffuse outward. The liquid droplets and fine dust entrained in the gas migrate outward during the rotation and turning process and are collected by the upper annular liquid collection tank 35. Then the gas enters the guide exhaust hood 4 through the central air inlet 411 and adjusts its flow direction within the space defined by the conical guide plate 41. The condensate formed inside the conical guide plate 41 is diverted and guided by multiple diversion guide plates 42 and then discharged. The treated gas is finally discharged from the purified gas outlet 12.

[0054] During the spraying process, the attached liquid flowing downward along the surface of the expansion and contraction air guide tube 2 enters the lower annular liquid collection tank 22, and the droplets intercepted on the outer periphery of the swirl air distribution plate 3 enter the upper annular liquid collection tank 35. The liquid in the two collection tanks returns to the circulating liquid tank 13 through the middle horizontal pipe and the upper horizontal pipe of the liquid collection return pipe 14, respectively. The main spray liquid collected at the bottom of the washing tower 1 returns to the circulating liquid tank 13 through the conventional tower bottom return structure. The circulating pump 15 then transports the circulating liquid to the annular spray pipe 17, thus forming a continuous liquid supply and branch return process.

[0055] When it is necessary to inspect the swirl air distributor 3 or the expansion air guide tube 2, the locking plate 23 can be released from locking the center positioning rod 33 after the equipment is stopped and the corresponding liquid is drained. Then, the center positioning rod 33 can be removed along the plug-in seat 24 to release the center positioning relationship between the swirl air distributor 3 and the expansion air guide tube 2. After the inspection or cleaning is completed, the center positioning rod 33 can be reinserted into the plug-in seat 24 and locked by the locking plate 23 to restore the relative installation position of the two.

[0056] The materials, anti-corrosion layers, and sealing methods of the scrubbing tower body 1, circulating liquid tank 13, liquid collection return pipe 14, and liquid guide pipe 16 can be selected according to the exhaust gas temperature, dust concentration, and properties of the scrubbing liquid using existing technologies in the field. For fixed connection parts, welding or fastening connections can be used. For pipe interfaces that need to be disassembled for maintenance, flange sealing connections can be used. The above conventional implementation methods do not change the spatial relationship, airflow path, and liquid circulation path between the various structures of the present invention.

[0057] In summary, this invention utilizes an annular spray pipe 17, a contraction-expansion air guide tube 2, a swirl air distribution plate 3, and a guide exhaust hood 4 to form a step-by-step airflow treatment path, and utilizes a lower annular liquid collection tank 22, an upper annular liquid collection tank 35, a liquid return pipe 14, and a circulating liquid tank 13 to form a liquid recovery path that cooperates with the airflow separation process. This enhances the contact between the waste gas and the washing liquid while maintaining continuous operation of the spray washing and reduces the possibility of the purified gas carrying liquid droplets and fine gypsum dust.

[0058] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A gypsum processing waste gas scrubbing tower based on a swirl-flow gas distribution structure, comprising a scrubbing tower body (1), characterized in that: It also includes an exhaust gas inlet (11) and an annular spray pipe (17), wherein the exhaust gas inlet (11) is located on the lower side wall of the scrubbing tower (1), and the annular spray pipe (17) is located in the lower part of the scrubbing tower (1) and is higher than the exhaust gas inlet (11). It also includes a shrink-expansion air guide tube (2), a lower annular liquid collection tank (22) and a swirl air distribution plate (3). The shrink-expansion air guide tube (2) is located above the annular spray pipe (17), the swirl air distribution plate (3) is located above the shrink-expansion air guide tube (2), and the lower annular liquid collection tank (22) is fixed to the lower periphery of the shrink-expansion air guide tube (2). The swirling air distribution plate (3) includes arc-shaped swirling blades (31), swirling air gaps (32), and an upper annular liquid collection groove (35). Multiple arc-shaped swirling blades (31) are fixed to the swirling air distribution plate (3) and distributed circumferentially. The swirling air gaps (32) are located between adjacent arc-shaped swirling blades (31) and are opposite to the upper end of the expansion and contraction air guide tube (2). The upper annular liquid collection groove (35) is fixed to the outer periphery of the swirling air distribution plate (3). It also includes a purified gas outlet (12) and a flow guide exhaust hood (4). The purified gas outlet (12) is located at the top of the scrubbing tower (1), and the flow guide exhaust hood (4) is located above the swirl air distribution plate (3) and is connected to the purified gas outlet (12). It also includes a circulating liquid tank (13) and a liquid collection return pipe (14), the circulating liquid tank (13) and the liquid collection return pipe (14) are located outside the washing tower body (1), and the liquid collection return pipe (14) is connected to the upper annular liquid collection tank (35), the lower annular liquid collection tank (22) and the circulating liquid tank (13).

2. The gypsum processing waste gas scrubbing tower based on a swirl gas distribution structure according to claim 1, characterized in that: The radial dimensions of the upper and lower ends of the expansion-contraction air guide tube (2) are both larger than the radial dimension of the middle part; The expansion-contraction air guide tube (2) includes multiple arc-shaped air guide plates. The multiple arc-shaped air guide plates are distributed circumferentially along the lower annular liquid collection tank (22). The lower end of the arc-shaped air guide plate is fixed to the lower annular liquid collection tank (22). The middle part of the arc-shaped air guide plate is bent toward the axis of the washing tower body (1), and the upper part of the arc-shaped air guide plate extends away from the axis of the washing tower body (1).

3. A gypsum processing waste gas scrubbing tower based on a swirl-flow gas distribution structure according to claim 2, characterized in that: The expansion-contraction air guide tube (2) also includes a longitudinal reinforcing rib (21), which is located on the side of the arc-shaped air guide plate facing the axis of the washing tower (1) and fixed to the arc-shaped air guide plate. The longitudinal reinforcing rib (21) extends between the lower end and the upper part of the arc-shaped air guide plate along the bending direction of the arc-shaped air guide plate.

4. A gypsum processing waste gas scrubbing tower based on a swirl-flow gas distribution structure according to claim 1, characterized in that: It also includes a plug-in seat (24), a center positioning rod (33) and a locking plate (23). The plug-in seat (24) is located at the lower center of the expansion-contraction air guide tube (2). The center positioning rod (33) is located at the lower center of the swirl air distribution plate (3) and extends vertically. The lower end of the center positioning rod (33) is inserted into the plug-in seat (24). The locking plate (23) is located on one side of the plug-in seat (24) and locks into the center positioning rod (33).

5. A gypsum processing waste gas scrubbing tower based on a swirl-flow gas distribution structure according to claim 1, characterized in that: The arc-shaped swirl blades (31) extend from the middle of the swirl air distribution plate (3) toward the upper annular liquid collection tank (35), and multiple arc-shaped swirl blades (31) bend along the same swirling direction; The width of the swirling air gap (32) gradually increases from the middle of the swirling air distribution plate (3) toward the upper annular liquid collection tank (35).

6. A gypsum processing waste gas scrubbing tower based on a swirl gas distribution structure according to claim 1, characterized in that: The swirl distribution plate (3) further includes a conical cover plate (34) and radial reinforcing ribs (341). The conical cover plate (34) is located on the upper side of the swirl distribution plate (3). The center of the conical cover plate (34) is higher than the outer periphery of the conical cover plate (34). The arc-shaped swirl blades (31) are fixed on the lower side of the conical cover plate (34). A plurality of radial reinforcing ribs (341) are distributed at intervals along the circumference of the conical cover plate (34) and fixed on the upper surface of the conical cover plate (34). The radial reinforcing ribs (341) extend from the center of the conical cover plate (34) to the outer periphery.

7. A gypsum processing waste gas scrubbing tower based on a swirl-flow gas distribution structure according to claim 1, characterized in that: Both the lower annular liquid collection tank (22) and the upper annular liquid collection tank (35) are annular tanks with their openings facing upwards. The inner peripheral wall of the lower annular liquid collection tank (22) is fixed to the lower outer wall of the expansion-contraction air guide tube (2), and the inner peripheral wall of the upper annular liquid collection tank (35) is fixed to the outer peripheral wall of the swirling air distribution plate (3).

8. A gypsum processing waste gas scrubbing tower based on a swirl-flow gas distribution structure according to claim 1, characterized in that: The flow guide exhaust hood (4) includes a conical flow guide plate (41), a central air inlet (411), and multiple diversion liquid guide plates (42). The conical flow guide plate (41) is located in the lower part of the interior of the flow guide exhaust hood (4) and is inclined downward from the outer periphery to the center. The central air inlet (411) is located in the center of the conical flow guide plate (41) and penetrates through the conical flow guide plate (41). Multiple diversion liquid guide plates (42) are fixed to the inner surface of the conical flow guide plate (41) and are distributed circumferentially. The diversion liquid guide plates (42) extend radially along the conical flow guide plate (41), and a liquid guiding channel is formed between adjacent diversion liquid guide plates (42).

9. A gypsum processing waste gas scrubbing tower based on a swirl-flow gas distribution structure according to claim 1, characterized in that: It also includes a circulation pump (15) and a liquid guide pipe (16). The circulation pump (15) is located on one side of the circulation tank (13). The inlet of the circulation pump (15) is connected to the circulation tank (13). The liquid guide pipe (16) is located between the outlet of the circulation pump (15) and the annular spray pipe (17). One end of the liquid guide pipe (16) is connected to the outlet of the circulation pump (15), and the other end of the liquid guide pipe (16) is connected to the annular spray pipe (17).

10. A gypsum processing waste gas scrubbing tower based on a swirl-flow gas distribution structure according to claim 7, characterized in that: The liquid collection return pipe (14) includes two transverse connecting pipes, which are located at the upper and middle parts of the liquid collection return pipe (14) respectively. The transverse connecting pipe located at the upper part of the liquid collection return pipe (14) is connected to the cavity of the upper annular liquid collection tank (35), and the transverse connecting pipe located at the middle part of the liquid collection return pipe (14) is connected to the cavity of the lower annular liquid collection tank (22). The lower end of the liquid collection return pipe (14) is connected to the interior of the circulating liquid tank (13).

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