Rotational flow plate tower with rotational flow plates of overflow shunting cover cylinder

Abstract

The utility model discloses a rotational flow plate tower with rotational flow plates of an overflow shunting cover cylinder, which is characterized in that a demister, a spray pipe, a plurality of layers of rotational flow plates, an air inlet pipe and an absorption liquid collecting pipe are sequentially arranged in a shell from top to bottom, and the top of the shell is communicated with an exhaust pipe; the utility model relates to a multi-stage swirl vane set, a blind plate located in the center of the multi-stage swirl vane set, a cover cylinder located on the edge of the multi-stage swirl vane set, an annular groove in the periphery of the multi-stage swirl vane set and a downcomer below the annular groove, and at least one stage of overflow shunting cover cylinder is arranged between the cover cylinder and the blind plate from inside to outside. The overflow shunting cover cylinder comprises a first annular groove and a second annular groove which are installed on the outer periphery and the inner periphery of the overflow shunting cover cylinder. And overflow holes are uniformly formed in the bottom, close to the second annular groove, of the overflow shunting cover cylinder. According to the utility model, on the premise of the same-scale gas treatment capacity, the tower diameter is reduced by 20-30%.

Description

Technical Field

[0001] The utility model relates to the field of chemical equipment, in particular to a swirl plate tower with a swirl plate having an overflow diversion cover tube. Background Art

[0002] Prior art 201020283594.9 discloses a swirl plate tower featuring a high porosity, resistance to clogging, a large mass transfer area, a long residence time for the gas medium and absorption liquid, and high mass transfer efficiency. To ensure uniform airflow through the swirl plates, those skilled in the art have designed them as double-shroud swirl plates. However, in actual production, further increasing the gas throughput significantly reduces the absorption efficiency. Simulation analysis indicates that the main reason for this is that, with increased flow rate and a constant tower diameter, the perforation velocity of the airflow through the swirl blades increases, causing the liquid to be blown away by the gas passing between the swirl plate blades and causing mist entrainment. This results in uneven distribution of the liquid film on the surface of the second swirl blade, reducing the mass transfer area. To address this issue, the traditional approach is to increase the outer diameters of the first and second swirl blades by 20-30% to increase the flow cross-section and reduce the perforation velocity. However, this approach significantly increases the cost of upgrading and upgrading existing swirl towers, necessitating the dismantling and reconstruction of the old equipment. Utility Model Content

[0003] The technical problem solved by the utility model is that, on the basis of not dismantling the original cyclone plate tower, by improving the connection structure between the first cyclone plate and the second cyclone plate, the problems of mist entrainment and uneven distribution of liquid film caused by excessive perforation speed are avoided, so that the gas processing capacity is increased by 30-40% without reducing the absorption efficiency of the cyclone plate tower.

[0004] The technical solution adopted by the present invention is a swirl plate with an overflow diversion cover tube, wherein the swirl plate includes, from the outside to the inside, a circle of cover tube, at least one circle of overflow diversion cover tube, and a circular blind plate centrally arranged in the swirl plate, the overflow diversion cover tube includes a first annular groove and a second annular groove respectively installed on the outer periphery and inner periphery of the overflow diversion cover tube, the first annular groove and the second annular groove both open upward, the bottom of the first annular groove is lower than the bottom of the second annular groove, the overflow diversion cover tube is evenly arranged with overflow holes near the bottom of the second annular groove, and the height of the overflow diversion cover tube is higher than the second annular groove;

[0005] A swirl blade group is also provided between the cover tube and the first annular groove of the overflow diverter cover tube and between the second annular groove of the overflow diverter cover tube and the blind plate, or between the first annular groove of the adjacent previous circle of overflow diverter cover tube and the second annular groove of the subsequent circle of overflow diverter cover tube. The swirl blade group is composed of swirl blades evenly distributed around the blind plate or the circumference of the overflow diverter cover tube. The radial angle of the swirl blade group is greater than 0 degrees, and the diameter of the subsequent circle of overflow diverter cover tube is greater than the diameter of the previous circle of overflow diverter cover tube.

[0006] Preferably, a circle of overflow diversion cover tube is arranged between the cover tube and the blind plate, and a swirl blade group is also provided between the second annular groove of the overflow diversion cover tube and the blind plate, and between the cover tube and the first annular groove of the overflow diversion cover tube. The swirl blade group is evenly arranged around the overflow diversion cover tube or around the blind plate.

[0007] Preferably, a demister, a spray pipe, several layers of swirl plates, an air intake pipe and an absorption liquid collecting pipe are sequentially arranged in the shell from top to bottom. The top of the shell is connected to the exhaust pipe. The shell and each layer of swirl plates are connected by an annular groove. A downcomer is provided below the annular groove, which surrounds the shell and points to the center of the swirl plate below. The upper end of the downcomer is connected to the annular groove. A manhole is also provided outside the shell above each layer of swirl plates. The spray pipe and air intake pipe are fixed in the shell by a bracket.

[0008] The elevation angle of the swirl blades is 5-25 degrees, and the radial angle is 20-25 degrees. All swirl blades rotate in the same direction around the center of the swirl plate and are inward-facing plates. The opening rate of the swirl plate is 30-40%.

[0009] Preferably, the lower ends of the downcomers are connected to annular supports, the annular supports are connected to the blind plates via hanging rods, and the cross-sectional area of ​​the annular supports is 40-50% of the cross-sectional area of ​​the air inlet pipe.

[0010] The elevation angle of the swirl blades is 5 degrees, and the radial angle is 20 degrees. Compared with the swirl plate tower in the background technology, the absorption tower provided by the technical solution of the present invention has the following advantages: the inner circle of swirl plates in the swirl plate serves as a blind plate liquid holding device for the outer circle of swirl plates. In the case of excessively high gas perforation speed, the overflow diversion hood blocks the liquid blown away from the inner circle of swirl plates and the entrained mist, and performs redistribution, which can make the liquid film coverage on the surface of the outer circle of swirl blades more uniform. Under the premise of the same scale of processing capacity, the tower diameter is reduced by 20%-30%. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the cross-sectional structure of the absorption tower of the present invention;

[0012] Figure 2 For this utility model Figure 1 Schematic diagram of the structure of the middle swirl plate;

[0013] Figure 3 For this utility model Figure 1Schematic diagram of the top view of the middle swirl plate when it is in an upright position. Reference numeral 2 is the absorption liquid collection pipe; 11 is the air inlet pipe; 12-1 is the annular bracket; 12-2 is the downcomer; 12-4 is the shroud; 12-6 is the first swirl blade; 12-7 is the blind plate; 12-8 is the second swirl blade; 12-9 is the suspension rod; 13 is the manhole; 17 is the exhaust pipe; 18 is the bracket; 19 is the spray pipe; 20 is the spray pipe opening; 22 is the housing; 25 is the annular groove; 40 is the overflow diversion shroud; 41 is the first annular groove; 42 is the second annular groove; and 43 is the overflow hole. DETAILED DESCRIPTION

[0014] The present invention will be further described in detail below with reference to the embodiments, but the protection scope of the present invention is not limited thereto.

[0015] Example 1

[0016] A swirl plate having an overflow diverter hood tube, the swirl plate comprising, from outside to inside, a ring of hood tubes 12-4, at least one ring of overflow diverter hood tubes 40, and a circular blind plate 12-7 centrally disposed within the swirl plate. A swirl blade assembly is further disposed between the hood tubes 12-4 and the overflow diverter hood tubes 40, between the overflow diverter hood tubes 40 and the blind plate 12-7, or between the preceding and succeeding rings of overflow diverter hood tubes 40. The swirl blade assembly comprises swirl blades evenly distributed around the circumference of the blind plate 12-7 or the overflow diverter hood tubes 40, with a radial angle of the swirl blade assembly greater than 0 degrees. If two rings of overflow diverter hood tubes 40 are provided, the diameter of the succeeding ring of overflow diverter hood tubes is larger than the diameter of the preceding ring of overflow diverter hood tubes.

[0017] As an example, Figure 2 As shown, the swirl plate includes a cover tube 12-4, a blind plate 12-7, a circle of overflow diversion cover tube 40 arranged between the cover tube 12-4 and the blind plate 12-7, and a swirl blade group (12-6, 12-8) evenly arranged around the overflow diversion cover tube 40 or around the blind plate 12-7 between the overflow diversion cover tube 40 and the blind plate 12-7, and between the cover tube 12-4 and the overflow diversion cover tube 40. The radial angle of the swirl blade group is greater than 0 degree.

[0018] like Figure 2 In the enlarged view I, the overflow diversion hood tube 40 includes a first annular groove 41 and a second annular groove 42 respectively installed on the outer periphery and inner periphery of the overflow diversion hood tube 40. The first annular groove 41 and the second annular groove 42 are both open upward, and the bottom of the first annular groove 41 is lower than the bottom of the second annular groove 42. The overflow diversion hood tube 40 is evenly arranged with overflow holes 43 near the bottom of the second annular groove 42, and the height of the overflow diversion hood tube 40 is higher than the second annular groove 42.

[0019] The swirl blade group 12-6 is evenly arranged around the circumference between the first annular groove 41 of the overflow diversion cover tube 40 and the cover tube 12-4, and the swirl blade group 12-7 is evenly arranged around the circumference between the second annular groove 42 of the overflow diversion cover tube 40 and the blind plate 12-7.

[0020] Example 2

[0021] like Figures 1 to 3 As shown, the utility model also relates to a multi-stage cyclone plate tower based on an overflow diversion hood tube, comprising a shell, in which a demister 14, a spray pipe 19, several layers of cyclone plates, an air intake pipe 11 and an absorption liquid collecting pipe 2 are arranged in sequence from top to bottom; the top of the shell 22 is connected to the exhaust pipe 17, and the shell 22 is connected to each layer of cyclone plates through an annular groove 25. A downcomer 12-2 is provided below the annular groove, surrounding the shell 22 and pointing to the center of the cyclone plate below. The upper end of the downcomer 12-2 is connected to the annular groove 25. A manhole 13 is also provided outside the shell 22 above each layer of cyclone plates. The spray pipe 19 and the air intake pipe 11 are fixed in the shell 22 by a bracket 18.

[0022] In a specific example, the elevation angle of the swirl blades is 5 degrees, and the radial angles are 20 degrees respectively. The swirl blades rotate in the same direction around the center of the swirl plate and are all inward-pointing plates. The opening rate of the swirl plate is 40%; the lower end of the downcomer 12-2 is connected to the annular bracket 12-1, and the annular bracket 12-1 is connected to the blind plate 12-7 through the suspension rod 12-9. The cross-sectional area of ​​the annular bracket 12-1 is 40% of the cross-sectional area of ​​the air inlet pipe 11.

[0023] During use of the utility model, formaldehyde gas enters the multi-stage cyclone plate tower from bottom to top through the air inlet pipe 11, and the absorption liquid enters the working area from top to bottom through the spray pipe 19; the air flow and the absorption liquid move relative to each other in the tower. The swirl plates located in each layer below the spray pipe 19 serve as inward plates for mass transfer, so that the formaldehyde gas passing through the plates has a centripetal component velocity, the centrifugal force is small, the droplets have a long travel distance, the gas-liquid contact time is prolonged, and the mass transfer efficiency is improved. The swirl plates have an opening ratio of 40%, which is used to force the formaldehyde gas to pass through, causing the airflow to spiral upward. The liquid flow descending from the spray pipe 19 or the downcomer 12-2 is distributed to each swirl blade 12-6 through the blind plate 12-7. The gas passes through the perforations of the swirl blade 12-6 to blow away the droplets, which are then collected by the overflow diversion hood 40 and distributed to the swirl blade 12-8, forming a liquid film and partially sprayed into droplets by the airflow. The droplets rotate with the airflow. Due to the centripetal component velocity, the droplets have a long travel distance, but are still thrown to the housing 22 by the centrifugal force, forming a liquid film and flowing down. They are collected in the downcomer 12-2 through the annular groove 25. The absorption liquid moves from top to bottom and is concentrated on the blind plate 12-7 of the next layer of swirl plates.

[0024] The absorption liquid and formaldehyde gas move toward each other in the cyclone plate, blowing the absorption liquid to form droplets, thereby increasing the contact area between the absorption liquid and formaldehyde gas.

[0025] Compared to conventional swirl plate towers, the absorption tower provided in this embodiment offers the following advantages: The inner swirl plate serves as a blind plate for the outer swirl plates. In the event of excessively high gas perforation velocities, the overflow diversion hood blocks liquid and entrained mist from the inner swirl plates, redistributing it and ensuring more uniform liquid film coverage on the outer swirl blades. This allows the tower diameter to be reduced by 20%-30% while maintaining the same processing capacity.

[0026] Therefore, compared with the cyclone plate tower in the background technology, this embodiment can process 100000m 3 / h of gas, the mass transfer efficiency is higher.

Claims

1. A swirl plate tower with a swirl plate having an overflow diversion hood, characterized in that: The swirl plate includes, from the outside to the inside, a circle of cover tubes, at least one circle of overflow diversion cover tubes, and a circular blind plate centrally arranged in the swirl plate. The overflow diversion cover tube includes a first annular groove and a second annular groove respectively installed on the outer periphery and inner periphery of the overflow diversion cover tube. The first annular groove and the second annular groove are both opened upward. The bottom of the first annular groove is lower than the bottom of the second annular groove. The overflow diversion cover tube is evenly arranged with overflow holes near the bottom of the second annular groove. The height of the overflow diversion cover tube is higher than the second annular groove. A swirl blade group is also provided between the cover tube and the first annular groove of the overflow diverter cover tube and between the second annular groove of the overflow diverter cover tube and the blind plate, or between the first annular groove of the adjacent previous circle of overflow diverter cover tube and the second annular groove of the subsequent circle of overflow diverter cover tube. The swirl blade group is composed of swirl blades evenly distributed around the blind plate or the circumference of the overflow diverter cover tube. The radial angle of the swirl blade group is greater than degrees, and the diameter of the subsequent circle of overflow diverter cover tube is greater than the diameter of the previous circle of overflow diverter cover tube.

2. The cyclone plate tower according to claim 1, characterized in that A circle of overflow diversion cover tube is set between the cover tube and the blind plate, and a swirl blade group evenly arranged around the overflow diversion cover tube or around the blind plate is also set between the second annular groove of the overflow diversion cover tube and the blind plate, and between the cover tube and the first annular groove of the overflow diversion cover tube.

3. The cyclone plate tower according to claim 1, characterized in that It includes a shell, in which a demister, a spray pipe, several layers of swirl plates, an air intake pipe and an absorption liquid collection pipe are arranged in sequence from top to bottom. The top of the shell is connected to the exhaust pipe. The shell and each layer of swirl plates are connected by an annular groove. A downcomer is provided below the annular groove, which surrounds the shell and points to the center of the swirl plate below. The upper end of the downcomer is connected to the annular groove. A manhole is also provided outside the shell above each layer of swirl plates. The spray pipe and the air intake pipe are fixed in the shell by a bracket.

4. The cyclone plate tower according to claim 3, characterized in that The elevation angle of the swirl blades is 5-25 degrees, and the radial angle is 20-25 degrees. All swirl blades rotate in the same direction around the center of the swirl plate and are inward-facing plates. The opening rate of the swirl plate is 30-40%.

5. The cyclone plate tower according to claim 3, characterized in that The lower ends of the downcomers are connected to annular supports, which are connected to blind plates via hanging rods. The cross-sectional area of ​​the annular supports is 40-50% of the cross-sectional area of ​​the air inlet pipe.

6. The cyclone plate tower according to claim 3, characterized in that The elevation angle of the swirl blades is 5 degrees, and the radial angle is 20 degrees.

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