Self-cleaning type low-temperature water removal tower for removing combined phosphorus

Abstract

The invention relates to the field of phosphorane low-temperature water removal, in particular to a self-cleaning type low-temperature water removal tower for removing combined phosphorus, which comprises a tower body and a low-temperature pipe, a plurality of low-temperature pipes are arranged in the tower body in the vertical direction, cleaning units are arranged above and below each layer of low-temperature pipes, each cleaning unit comprises a coating shell rotating around the axis of the tower body, each coating shell is of a cylindrical structure, the axis of each coating shell is parallel to the radial direction of the tower body, an opening is formed in each coating shell and vertically faces the corresponding low-temperature pipe, and each coating shell is of a cylindrical structure. A shielding plate is rotationally arranged in the coating shell, the shielding plate is of an arc-shaped structure, the shielding plate can shield the opening in the rotating process, a cleaning plate rotating around the axis of the coating shell is further arranged in the coating shell, when the shielding plate shields the opening, the cleaning plate stops rotating, and when the shielding plate is withdrawn from the opening, the cleaning plate continuously rotates. According to the low-temperature pipe cleaning device, the low-temperature pipe is automatically cleaned, and the workload is reduced.

Description

Technical Field

[0001] The invention relates to the field of low-temperature dehydration of phosphine, and in particular to a self-cleaning low-temperature dehydration tower for removing combined phosphine. Background Art

[0002] In the phosphine preparation process, one of the methods is to prepare crude phosphine by wet process with yellow phosphorus, sodium hydroxide and calcium hydroxide. The crude phosphine contains a certain amount of combined phosphorus and polyphosphate. The polyphosphate and combined phosphorus in the phosphine gas can be separated by a water washing device and a low-temperature water removal device.

[0003] Chinese Patent Publication No. CN112057888A discloses a dewatering tower for terephthalic acid production, comprising a skirt and a dewatering tower body. The skirt is arranged at the bottom of the dewatering tower body. The dewatering tower body is composed of a lower head, a lower cylinder, a lower conical shell, a middle cylinder, an upper conical shell, an upper cylinder, and an upper head connected in sequence from bottom to top. An entrainer inlet is provided on the side of the upper cylinder of the dewatering tower body, and a plurality of tower plates are provided inside the upper cylinder. The tower plates are provided below the entrainer inlet. An inlet for a mixed solution of water and acetic acid is provided on the upper side of the middle cylinder, and an inlet for water and acetic acid vapor is provided on the lower side of the middle cylinder. A dehydrated acetic acid outlet is provided at the bottom of the lower head, and a water and entrainer vapor outlet is provided at the top of the upper head.

[0004] The above solution is a dehydration tower in the prior art, and the low-temperature dehydration tower is a low-temperature pipeline installed in the dehydration tower, so that the phosphine gas is dehydrated when passing through the low-temperature dehydration tower. However, due to the winding pipeline in the low-temperature dehydration tower, some of the phosphine will adhere to the inside of the low-temperature dehydration tower. At the same time, some of the phosphine will also adhere to the outside of the pipeline installed in the low-temperature dehydration tower. After a period of use, the interior of the low-temperature dehydration tower needs to be cleaned. However, due to the winding pipeline in the existing low-temperature dehydration tower, cleaning is very difficult. Summary of the Invention

[0005] In response to the above problems, a self-cleaning low-temperature dehydration tower for removing linked phosphorus is provided. By arranging cleaning units above and below each cryogenic tube, the cleaning units are first driven by a lifting unit so that the cleaning unit above the cryogenic tube cleans the upper part of the cryogenic tube. Then, the lifting unit drives the cleaning unit upward so that the cleaning unit below the cryogenic tube cleans the lower part of the cryogenic tube. In this way, the cryogenic tube is automatically cleaned, which reduces the workload. At the same time, since linked phosphorus is adhesive, a coating shell is provided on the outside of the cleaning plate to prevent the cleaning plate from being attached to the linked phosphorus when it is not in a cleaning state, and to prevent the cleaning plate from slipping when cleaning the cryogenic tube, thereby ensuring the cleaning effect. At the same time, the rotation speed of the cleaning plate inside the coating shell is made greater than the rotation speed of the coating shell around the tower body, which can avoid the occurrence of cleaning blind spots when the cryogenic tube is cleaned.

[0006] In order to solve the problems of the prior art, the present invention provides a self-cleaning low-temperature water removal tower for removing linked phosphorus, comprising a tower body and a low-temperature tube arranged in the tower body; the tower body is a cylindrical shell structure, a plurality of low-temperature tubes are arranged in the tower body along the vertical direction, and a cleaning unit is arranged above and below each layer of low-temperature tubes, the cleaning unit comprising a covering shell rotating around the axis of the tower body, the covering shell is a cylindrical structure, the axis of the covering shell is parallel to the radial direction of the tower body, an opening is provided on the covering shell, the opening is vertically facing the low-temperature tube, a shielding plate is rotatably arranged in the covering shell, the shielding plate is an arc-shaped structure, and the shielding plate can shield the opening during rotation, a cleaning plate is also provided in the covering shell that rotates around the axis of the covering shell, when the shielding plate shields the opening, the cleaning plate stops rotating, and when the shielding plate is withdrawn from the opening, the cleaning plate continues to rotate, a driving unit for driving the covering shell to rotate around the axis of the tower body is provided on the upper part of the cleaning unit, and a lifting unit for driving the cleaning unit to rise and fall in the vertical direction is also provided above the cleaning unit.

[0007] Preferably, the rotation speed of the cleaning plate around the axis of the coating shell is greater than the rotation speed of the coating shell around the axis of the tower body.

[0008] Preferably, the cleaning unit includes a rotating shaft arranged inside the covering shell and rotating along the axis of the covering shell, a driving unit is arranged on the rotating shaft inside the covering shell and rotating along the axis of the covering shell, a cleaning plate is arranged on the rotating shaft, the cleaning plate rotates synchronously with the rotating shaft, a plurality of magnetic blocks are evenly distributed around the axis of the rotating shaft at the end of the rotating shaft, a plurality of electromagnets are distributed on one side of the magnetic block, the electromagnets are arranged around the axis of the rotating shaft, and the power-on logic of the electromagnets is to be energized in sequence.

[0009] Preferably, a ratchet is fixedly provided at the end of the rotating shaft, a rotating ring is rotatably provided on the periphery of the ratchet, the baffle is fixedly provided on the rotating ring, and a plurality of extension claws are fixedly provided on the inner ring of the rotating ring. The extension claws are evenly arranged around the axis of the rotating ring, and the ends of the extension claws extend to one side of the ratchet and contact the ratchet. The extension claw cooperates with the ratchet for unidirectional rotation. The extension claw is made of elastic material, and a limit block is fixedly provided inside the covering shell. The limit block is located on one side of the opening of the covering shell, and the limit block is located on the rotation path of the baffle.

[0010] Preferably, the drive unit includes a drive shaft vertically rotatably arranged in the tower body, the covering shell is fixedly arranged on the side wall of the drive shaft, the upper fixed sleeve of the drive shaft is provided with a gear ring, one side of the gear ring is engaged with a gear, and the upper end of the gear is provided with a rotary driver for driving the gear to rotate.

[0011] Preferably, a first ventilation groove is vertically opened in the driving shaft, a second ventilation groove is opened in the rotating shaft along the axial direction of the rotating shaft, the first ventilation groove and the second ventilation groove are connected to each other, a push plate is vertically arranged in the first ventilation groove, a limiting ring is fixed above and below the push plate respectively, the push plate moves between the two limiting rings along the vertical direction, an air pump connected to the first ventilation groove is provided at the upper part of the first ventilation groove, a sliding groove is opened on the rotating shaft along the radial direction of the rotating shaft, and the cleaning plate is slidably arranged on the sliding groove.

[0012] Preferably, a driving rod is vertically fixedly provided on the output end of the rotary driver, the horizontal cross section of the driving rod is a non-circular structure, the driving rod vertically penetrates the gear and slides with the gear in the vertical direction.

[0013] Preferably, the lifting unit includes a winder arranged at the upper part of the tower body, a lifting rope is wound inside the winder, a lifting frame is arranged in the tower body for vertical movement, the driving unit is arranged on the lifting frame, and the end of the lifting rope extending from the winder is fixedly connected to the lifting frame.

[0014] Preferably, a plurality of air inlet pipes are vertically arranged at the bottom of the tower body, and the air inlet pipes introduce the gas containing the diphosphorus into the tower body. A fan is arranged at the top of the tower body, and the fan is used to discharge the air in the tower body.

[0015] Preferably, a shielding cap is provided on the upper portion of the air inlet pipe, the shielding cap is a conical structure, and a switch valve is provided at the bottom of the tower body.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention provides cleaning units above and below each cryogenic tube. The cleaning units are first driven by a lifting unit, so that the cleaning unit above the cryogenic tube cleans the upper part of the cryogenic tube. The lifting unit then drives the cleaning unit upward, so that the cleaning unit below the cryogenic tube cleans the lower part of the cryogenic tube. This achieves automatic cleaning of the cryogenic tube and reduces workload. At the same time, since the phosphorus is adhesive, a coating shell is provided on the outside of the cleaning plate to prevent the cleaning plate from being attached to the phosphorus when it is not in a cleaning state, thereby preventing the cleaning plate from slipping when cleaning the cryogenic tube, thereby ensuring the cleaning effect. At the same time, the rotation speed of the cleaning plate inside the coating shell is greater than the rotation speed of the coating shell around the tower body, which can avoid the occurrence of cleaning blind spots when the cryogenic tube is cleaned.

[0017] 2. A rotating shaft is provided in the covering shell, and the electromagnets are energized in sequence, so that the rotating shaft is driven to rotate. The shielding plate provided in the covering shell does not need to be driven by a separate driver. Instead, a ratchet is provided at the end of the rotating shaft, and a rotating ring with an inner ring having an extension claw is provided on the outer surface of the ratchet, so that the ratchet and the extension claw are matched for one-way rotation. When the cleaning unit is ready to clean, the rotating shaft drives the ratchet to rotate, so that the ratchet drives the rotating ring to rotate through the extension claw, so that the shielding plate provided on the rotating ring is withdrawn from the opening of the covering shell. When the shielding plate contacts the end of the limit block on the covering shell, the rotating shaft can still continue to rotate. When the ratchet rotates, the extension claw bends, and the rotating shaft drives the cleaning plate to rotate synchronously. The cleaning plate cleans the low-temperature tube. When the cleaning is completed, the rotating shaft rotates in the opposite direction, and the ratchet pushes the extension claw to rotate in the opposite direction. The shielding plate blocks the opening of the covering shell and contacts the limit block. At this time, the extension claw cannot be bent. In this way, the shielding plate can block and open the opening of the covering shell only by rotating the rotating shaft. At the same time, after the shielding plate is opened, the cleaning plate can rotate normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The present invention is a three-dimensional schematic diagram of a self-cleaning low-temperature water removal tower for removing combined phosphorus.

[0019] Figure 2 The present invention is a side view of a self-cleaning low-temperature water removal tower for removing combined phosphorus.

[0020] Figure 3 The present invention is a self-cleaning low-temperature dehydration tower for removing phosphorus. Figure 2 Schematic cross-sectional view at AA in the middle.

[0021] Figure 4 The present invention is a cutaway perspective schematic diagram of a self-cleaning low-temperature dehydration tower for removing combined phosphates.

[0022] Figure 5 The present invention is a self-cleaning low-temperature dehydration tower for removing phosphorus. Figure 4 A partial enlarged schematic diagram of point B in the middle.

[0023] Figure 6 The present invention is a self-cleaning low-temperature dehydration tower for removing phosphorus. Figure 4 A partial enlarged schematic diagram of point C in the middle.

[0024] Figure 7 The present invention is a self-cleaning low-temperature dehydration tower for removing phosphorus. Figure 4 A local enlarged schematic diagram of point D in the middle.

[0025] Figure 8 The present invention is a three-dimensional schematic diagram of a self-cleaning low-temperature water removal tower for removing combined phosphates with the tower body removed.

[0026] Figure 9 The present invention is a cutaway perspective schematic diagram of a self-cleaning low-temperature dehydration tower for removing combined phosphates, with the tower body removed.

[0027] Figure 10 The present invention is a self-cleaning low-temperature dehydration tower for removing phosphorus. Figure 9 A partial enlarged schematic diagram of point E in the middle.

[0028] Figure 11 The present invention is a three-dimensional schematic diagram of a cleaning unit of a self-cleaning low-temperature dehydration tower for removing combined phosphorus, with the covering shell removed.

[0029] Figure 12 The present invention is a schematic cutaway perspective view of a cleaning unit of a self-cleaning low-temperature dehydration tower for removing combined phosphates.

[0030] The numbers in the figure are: 1. Tower body; 11. Air inlet pipe; 12. Fan; 13. Shielding cap; 14. Switch valve; 15. Nozzle; 2. Cryogenic tube; 3. Cleaning unit; 31. Cleaning plate; 311. Rotating shaft; 312. Electromagnet; 313. Magnetic block; 32. Covering shell; 33. Shielding plate; 34. Ratchet; 35. Rotating ring; 351. Extension claw; 36. Limit block; 4. Driving unit; 41. Driving shaft; 42. Gear ring; 43. Gear; 44. Rotary drive; 441. Driving rod; 45. First ventilation groove; 46. Second ventilation groove; 47. Push plate; 48. Limiting ring; 49. Air pump; 5. Lifting unit; 51. Winder; 52. Lifting frame; 53. Lifting rope. DETAILED DESCRIPTION

[0031] In order to further understand the features, technical means, specific objectives and functions achieved by the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] Reference Figure 1-Figure 5 and Figure 10: A self-cleaning low-temperature dehydration tower for removing phosphorus, comprising a tower body 1 and a low-temperature tube 2 arranged in the tower body 1; the tower body 1 is a cylindrical shell structure, a plurality of low-temperature tubes 2 are arranged in the tower body 1 along the vertical direction, and a cleaning unit 3 is arranged above and below each layer of low-temperature tubes 2, and the cleaning unit 3 includes a covering shell 32 rotating around the axis of the tower body 1, the covering shell 32 is a cylindrical structure, the axis of the covering shell 32 is parallel to the radial direction of the tower body 1, and an opening is provided on the covering shell 32, which is vertically facing the low-temperature tube 2 and rotates in the covering shell 32. A shielding plate 33 is provided in the covering shell 32, which has an arc-shaped structure. The shielding plate 33 can cover the opening during rotation. A cleaning plate 31 that rotates around the axis of the covering shell 32 is also provided in the covering shell 32. When the shielding plate 33 covers the opening, the cleaning plate 31 stops rotating. When the shielding plate 33 is withdrawn from the opening, the cleaning plate 31 continues to rotate. A driving unit 4 that drives the covering shell 32 to rotate around the axis of the tower body 1 is provided on the upper part of the cleaning unit 3, and a lifting unit 5 that drives the cleaning unit 3 to rise and fall in the vertical direction is also provided above the cleaning unit 3.

[0033] The operating principle of existing low-temperature dehydration towers is to introduce refrigerant into cryogenic tubes 2, causing them to rapidly cool. Subsequently, the water-washed gas containing diphosphate is passed into the tower body 1. As the gas passes through the cryogenic tubes 2, the temperature difference there creates water vapor, which in turn separates the diphosphate. This removes the water vapor and diphosphate from the gas entering the tower body 1, with the separated water and diphosphate accumulating at the bottom of the tower body 1. Due to the very low temperature of the tower body 1 itself, existing processes typically employ two low-temperature dehydration towers: a primary tower at -50 degrees Celsius and a secondary tower at -110 degrees Celsius. The separated water and diphosphate accumulate within the tower body 1. An electric heating element is installed at the bottom of the tower body 1, which is periodically activated to melt and discharge any water and diphosphate condensed on the cryogenic tubes 2. However, diphosphate still clings to the exterior of the cryogenic tubes 2. After a period of use, the cryogenic tubes 2 need to be cleaned. Since multiple cryogenic tubes 2 are vertically arranged within the tower body 1, cleaning requires sequentially removing and cleaning cryogenic tubes 2 from different layers, a significant workload. If left uncleaned for an extended period, residual phosphine accumulates and becomes difficult to remove, potentially affecting the proper functioning of the cryogenic tubes 2.

[0034] In order to avoid the above situation, a cleaning unit 3 is set in the tower body 1. A cleaning unit 3 is set above and below each layer of the cryogenic tube 2. When the cryogenic tube 2 needs to be cleaned, it can be cleaned by the cleaning unit 3 without disassembling the cryogenic tube 2 layer by layer, which reduces the workload. The specific structure and working steps of the cleaning unit 3 are as follows: During the operation of the low-temperature dehydration tower, the gas containing phosphorus is introduced into the tower body 1 from the bottom of the tower body 1. The water and phosphorus in the gas are separated when passing through the low-temperature tube 2. The remaining gas is discharged from the upper part of the tower body 1. The separated water and phosphorus first accumulate on the low-temperature tube 2. As the accumulation amount gradually increases, the electric heating wire set at the bottom of the tower body 1 is regularly activated. The cleaning unit 3 is synchronously activated when the electric heating wire is activated. The cleaning unit 3 does not contact the low-temperature tube 2 when the electric heating wire is not activated. When the electric heating wire is activated, the water and phosphorus condensed on the low-temperature tube 2 gradually separate. At this time, the lifting unit 5 first lowers the cleaning unit 3. Since there is a cleaning unit 3 above and below each layer of low-temperature tube 2, there are multiple cleaning units 3 in the tower body 1. The lifting unit 5 drives all the cleaning units 3 to rise and fall synchronously. When the lifting unit 5 drives the cleaning unit 3 to descend, the corresponding cleaning unit 3 above each low-temperature tube 2 begins to descend. The shielding plate 33 in the cleaning unit 3 rotates and withdraws from the opening of the covering shell 32, and the driving unit 4 drives The covering shells 32 in all cleaning units 3 are driven to rotate around the axis of the tower body 1, and at the same time, the cleaning plates 31 in the covering shells 32 begin to rotate around the axis of the covering shells 32. This avoids the situation where the cleaning plates 31 always use a single position of a cleaning plate 31 to clean the cryogenic tube 2 as the covering shell 32 rotates around the axis of the tower body 1, which results in poor cleaning effect and high wear on the cleaning plates 31. Instead, the cleaning plates 31 are rotated in the covering shells 32, and multiple cleaning plates 31 are arranged in one covering shell 32, thereby improving the cleaning effect. When the cleaning unit 3 above the cryogenic tube 2 cleans the cryogenic tube 2, the cleaning unit 3 below the cryogenic tube 2 is away from the cryogenic tube 2, and the opening of the covering shell 32 in the cleaning unit 3 is shielded by the shielding plate 33. In this way, the water and phosphorus cleaned from the cryogenic tube 2 will not fall into the covering shell 32 below the cryogenic tube 2 through the opening. Similarly, after the cleaning unit 3 above the cryogenic tube 2 completes cleaning the upper part of the cryogenic tube 2, the lifting unit 5 drives the cleaning unit 3 to rise, so that the cleaning unit 3 below the cryogenic tube 2 cleans the lower part of the cryogenic tube 2. When the cleaning unit 3 below the cryogenic tube 2 cleans the cryogenic tube 2, the shielding plate 33 in the cleaning unit 3 rotates and withdraws from the opening of the covering shell 32. Then, the cleaning plate 31 in the cleaning unit 3 rotates around the axis of the covering shell 32 inside the covering shell 32, and the covering shell 32 rotates around the axis of the tower body 1.

[0035] In this way, automatic cleaning of the cryogenic tube 2 is achieved, and the workload is reduced. At the same time, by arranging a covering shell 32 on the outside of the cleaning plate 31, it is also avoided that the cleaning plate 31 is attached to phosphorus when it is in a non-cleaning state, and the cleaning plate 31 is avoided from slipping when cleaning the cryogenic tube 2, thereby ensuring the cleaning effect.

[0036] It is worth noting that the rotation speed of the cleaning plate 31 located in the covering shell 32 is greater than the rotation speed of the covering shell 32 around the tower body 1, so as to avoid a blind spot when cleaning the cryogenic tube 2.

[0037] Reference Figures 1-12 : The rotation speed of the cleaning plate 31 around the axis of the covering shell 32 is greater than the rotation speed of the covering shell 32 around the axis of the tower body 1.

[0038] The rotation speed of the cleaning plate 31 around the covering shell 32 is greater than the rotation speed of the covering shell 32 around the tower body 1. No recommended parameters are given in this article, and the specific parameters can be determined according to actual conditions.

[0039] Reference Figure 5 : The cleaning unit 3 includes a rotating shaft 311 that is rotatable along the axis of the covering shell 32 and is arranged inside the covering shell 32. The driving unit 4 is rotatable along the axis of the covering shell 32 and is arranged on the rotating shaft 311 inside the covering shell 32. The cleaning plate 31 is arranged on the rotating shaft 311. The cleaning plate 31 rotates synchronously with the rotating shaft 311. A plurality of magnetic blocks 313 are evenly distributed around the axis of the rotating shaft 311 at the end of the rotating shaft 311. A plurality of electromagnets 312 are distributed on one side of the magnetic block 313. The electromagnets 312 are arranged around the axis of the rotating shaft 311. The power-on logic of the electromagnets 312 is to be energized in sequence.

[0040] Reference Figure 10 and Figure 11 : A ratchet 34 is fixedly provided at the end of the rotating shaft 311, a rotating ring 35 is rotatably provided on the periphery of the ratchet 34, the baffle 33 is fixedly provided on the rotating ring 35, and a plurality of extension claws 351 are fixedly provided on the inner ring of the rotating ring 35. The extension claws 351 are evenly arranged around the axis of the rotating ring 35, and the ends of the extension claws 351 extend to one side of the ratchet 34 and contact the ratchet 34. The extension claws 351 are matched with the ratchet 34 for one-way rotation. The extension claws 351 are made of elastic material, and a limit block 36 is fixedly provided inside the covering shell 32. The limit block 36 is located on the opening side of the covering shell 32, and the limit block 36 is located on the rotation path of the baffle 33.

[0041] When the cleaning unit 3 cleans the cryogenic tube 2, the electromagnet 312 starts to be energized in sequence, and the electromagnet 312 attracts the magnetic block 313 provided at the end of the rotating shaft 311, so that the rotating shaft 311 can rotate in the covering shell 32, and the cleaning plate 31 provided on the rotating shaft 311 rotates synchronously with the rotating shaft 311. At this time, the shielding plate 33 is in the withdrawn state, that is, the shielding plate 33 does not block the opening on the covering shell 32. At this time, the shielding plate 33 is in the covering shell 32 and contacts one end of the limit block 36. When the rotating shaft 311 rotates, the ratchet 34 is driven. The extending claw 351 rotates synchronously. At this time, the ratchet 34 cooperates with the extending claw 351 to rotate in one direction, and the extending claw 351 does not hinder the ratchet 34. In this way, after the baffle plate 33 is limited by the limit block 36, the ratchet 34 can still rotate normally. After the cleaning is completed, the electromagnet 312 is energized in reverse order, the rotating shaft 311 rotates in the opposite direction, the ratchet 34 pushes the extending claw 351, and the extending claw 351 drives the baffle plate 33 to rotate synchronously through the rotating ring 35. When the baffle plate 33 blocks the opening of the covering shell 32 and contacts the limit block 36, the rotating shaft 311 stops rotating. When cleaning is needed again, the rotating shaft 311 drives the extending claw 351 to rotate through the ratchet 34. Since the extending claw 351 is elastic, when the baffle plate 33 does not contact the end of the limit block 36, the ratchet 34 drives the rotating ring 35 to rotate synchronously through the extending claw 351, thereby realizing the synchronous rotation of the rotating shaft 311 and the baffle plate 33. When the baffle plate 33 contacts the limit block 36, the rotating shaft 311 continues to rotate, and the extending claw 351 bends during the rotation of the ratchet 34, so that the rotating shaft 311 can continue to rotate, while the baffle plate 33 stops rotating.

[0042] Reference Figure 6 : The driving unit 4 includes a driving shaft 41 that is vertically rotated and arranged in the tower body 1. The covering shell 32 is fixedly arranged on the side wall of the driving shaft 41. A gear ring 42 is fixedly sleeved on the upper part of the driving shaft 41. A gear 43 is meshed with one side of the gear ring 42. A rotating driver 44 for driving the gear 43 to rotate is provided at the upper end of the gear 43.

[0043] Reference Figure 5 and Figure 6 : A first ventilation groove 45 is vertically opened in the driving shaft 41, and a second ventilation groove 46 is opened in the rotating shaft 311 along the axial direction of the rotating shaft 311. The first ventilation groove 45 and the second ventilation groove 46 are connected to each other. A push plate 47 is vertically arranged in the first ventilation groove 45, and a limiting ring 48 is fixed above and below the push plate 47 respectively. The push plate 47 moves between the two limiting rings 48 along the vertical direction. An air pump 49 connected to the first ventilation groove 45 is provided on the upper part of the first ventilation groove 45, and a sliding groove is opened on the rotating shaft 311 along the radial direction of the rotating shaft 311, and the cleaning plate 31 is slidably arranged on the sliding groove.

[0044] The rotary driver 44 is preferably a servo motor. The rotary driver 44 drives the gear ring 42 to rotate via the gear 43, thereby rotating the rotating shaft 311, and the rotating shaft 311 drives the cover shell 32 to rotate synchronously. During cleaning, the air pump 49 provided at the end of the first ventilation groove 45 supplies air to the first ventilation groove 45, causing the push plate 47 provided in the first ventilation groove 45 to descend. This allows the air in the first ventilation groove 45 to be discharged into the second ventilation groove 46, thereby causing the cleaning plate 31 slidably provided on the sliding groove to slide out. When the cleaning plate 31 passes through the opening of the cover shell 32, the cleaning plate 31 extends radially along the rotating shaft 311, allowing the cleaning plate 31 to better clean the cryogenic tube 2. Since the cleaning plate 31 is an arc-shaped structure, the cleaning plate 31 can slide back into the cover shell 32 after extending through the opening of the cover shell 32.

[0045] Reference Figure 6 : A driving rod 441 is vertically fixed on the output end of the rotary driver 44. The horizontal cross-section of the driving rod 441 is a non-circular structure. The driving rod 441 vertically penetrates the gear 43 and slides with the gear 43 in the vertical direction.

[0046] Reference Figure 9 : The lifting unit 5 includes a winder 51 arranged at the upper part of the tower body 1, a lifting rope 53 is wound inside the winder 51, and a lifting frame 52 is arranged to move vertically inside the tower body 1. The drive unit 4 is arranged on the lifting frame 52, and the end of the lifting rope 53 extending from the winder 51 is fixedly connected to the lifting frame 52.

[0047] The rotary driver 44 is fixedly arranged on the top of the tower body 1. Since the lifting frame 52 moves in the vertical direction, in order to ensure that the rotary driver 44 can smoothly drive the gear 43 to rotate, a driving rod 441 is provided on the output end of the rotary driver 44, so that the horizontal cross-section of the driving rod 441 is a non-circular structure, and the driving rod 441 and the gear 43 are slidably matched in the vertical direction. In this way, no matter how the lifting frame 52 is raised or lowered, the driving rod 441 can drive the gear 43 to rotate.

[0048] Reference Figure 1-Figure 3 : A plurality of air inlet pipes 11 are vertically arranged at the bottom of the tower body 1, and the air inlet pipes 11 introduce the gas containing phosphorus into the tower body 1. A fan 12 is arranged at the top of the tower body 1, and the fan 12 is used to discharge the air in the tower body 1.

[0049] Reference Figure 4 and Figure 7 : A shielding cap 13 is provided on the upper part of the air inlet pipe 11, and the shielding cap 13 is a conical structure. A switch valve 14 is provided at the bottom of the tower body 1.

[0050] Multiple nozzles 15 are installed on the side walls of the housing. These nozzles spray cleaning fluid into the tower body 1 during cleaning by the cleaning unit 3. An electric heating wire is installed at the bottom of the tower body 1. When activated, the on-off valve 14 opens, melting the ice on the cryogenic tube 2 into water. The phosphorus attached to the cryogenic tube 2 falls along with the water and is discharged through the on-off valve 14. A shielding cap 13 installed above the air inlet pipe 11 prevents the falling water and phosphorus from entering the air inlet pipe 11, thus preventing the air inlet pipe 11 from freezing and clogging due to the temperature drop in the tower body 1 after the cryogenic tube 2 is cooled again.

[0051] Working principle: During cleaning, the cleaning unit 3 and the electric heating wire are started at the same time. The cleaning unit 3 does not contact the cryogenic tube 2 when the electric heating wire is not started. When the electric heating wire is started, the water and phosphorus condensed on the cryogenic tube 2 gradually separate. At this time, the lifting unit 5 first lowers the cleaning unit 3. Since there is a cleaning unit 3 above and below each cryogenic tube 2, there are multiple cleaning units 3 in the tower body 1. The lifting unit 5 drives all the cleaning units 3 to rise and fall synchronously. When the lifting unit 5 drives the cleaning unit 3 to fall, the corresponding cleaning unit 3 above each cryogenic tube 2 begins to fall. The shielding plate 33 in the cleaning unit 3 rotates and withdraws from the opening of the covering shell 32, and the driving unit 4 drives The covering shells 32 in all cleaning units 3 are driven to rotate around the axis of the tower body 1, and at the same time, the cleaning plates 31 in the covering shells 32 begin to rotate around the axis of the covering shells 32. This avoids the situation where the cleaning plates 31 always use a single position of a cleaning plate 31 to clean the cryogenic tube 2 as the covering shell 32 rotates around the axis of the tower body 1, which results in poor cleaning effect and high wear on the cleaning plates 31. Instead, the cleaning plates 31 are rotated in the covering shells 32, and multiple cleaning plates 31 are arranged in one covering shell 32, thereby improving the cleaning effect.

[0052] While the cleaning unit 3 above the cryogenic tube 2 is cleaning the cryogenic tube 2, the cleaning unit 3 below the cryogenic tube 2 is away from the cryogenic tube 2, and the opening of the covering shell 32 in the cleaning unit 3 is shielded by the shielding plate 33. This prevents the water and phosphine removed from the cryogenic tube 2 from falling through the opening into the covering shell 32 below the cryogenic tube 2. Similarly, after the cleaning unit 3 above the cryogenic tube 2 completes cleaning the upper portion of the cryogenic tube 2, the lifting unit 5 drives the cleaning unit 3 upward, allowing the cleaning unit 3 below the cryogenic tube 2 to clean the lower portion of the cryogenic tube 2. While the cleaning unit 3 below the cryogenic tube 2 is cleaning the cryogenic tube 2, the shielding plate 33 in the cleaning unit 3 rotates and withdraws from the opening of the covering shell 32. Subsequently, the cleaning plate 31 in the cleaning unit 3 rotates within the covering shell 32 around the axis of the covering shell 32, and the covering shell 32 rotates around the axis of the tower body 1, thereby completing the cleaning of the cryogenic tube 2.

[0053] This achieves automatic cleaning of the cryogenic tube 2, reducing workload. Furthermore, by providing the outer covering 32 around the cleaning plate 31, it prevents the cleaning plate 31 from being attached to phosphorus when not in the cleaning state, preventing the cleaning plate 31 from slipping while cleaning the cryogenic tube 2, thereby ensuring effective cleaning. It is worth noting that the rotation speed of the cleaning plate 31 within the covering 32 is greater than the rotation speed of the covering 32 around the tower body 1, thus avoiding blind spots when cleaning the cryogenic tube 2.

[0054] The above embodiments merely represent one or more embodiments of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of protection of the present invention. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present invention, and such modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the appended claims.

Claims

1. A self-cleaning low-temperature dehydration tower for removing combined phosphorus, comprising a tower body (1) and a low-temperature pipe (2) arranged in the tower body (1); It is characterized in that The tower body (1) is a cylindrical shell structure. A plurality of cryogenic tubes (2) are arranged in the tower body (1) in a vertical direction. A cleaning unit (3) is arranged above and below each layer of cryogenic tubes (2). The cleaning unit (3) includes a covering shell (32) that rotates around the axis of the tower body (1). The covering shell (32) is a cylindrical structure. The axis of the covering shell (32) is parallel to the radial direction of the tower body (1). An opening is provided on the covering shell (32), and the opening is vertically facing the cryogenic tube (2). A shielding plate (33) is rotatably arranged in the covering shell (32). The shielding plate (33) is an arc-shaped structure. The shielding plate (33) can shield the opening during the rotation process, and a cleaning plate (31) is further provided in the covering shell (32) and rotates around the axis of the covering shell (32). When the shielding plate (33) shields the opening, the cleaning plate (31) stops rotating. When the shielding plate (33) is withdrawn from the opening, the cleaning plate (31) continues to rotate. A driving unit (4) is provided on the upper part of the cleaning unit (3) for driving the covering shell (32) to rotate around the axis of the tower body (1), and a lifting unit (5) is further provided above the cleaning unit (3) for driving the cleaning unit (3) to rise and fall in the vertical direction.

2. The self-cleaning low-temperature dehydration tower for removing combined phosphorus according to claim 1, characterized in that: The rotation speed of the cleaning plate (31) around the axis of the covering shell (32) is greater than the rotation speed of the covering shell (32) around the axis of the tower body (1).

3. The self-cleaning low-temperature dehydration tower for removing combined phosphorus according to claim 1, characterized in that: The cleaning unit (3) comprises a rotating shaft (311) arranged inside the covering shell (32) and rotatable along the axis of the covering shell (32); a driving unit (4) is arranged on the rotating shaft (311) inside the covering shell (32) and rotatable along the axis of the covering shell (32); a cleaning plate (31) is arranged on the rotating shaft (311); the cleaning plate (31) rotates synchronously with the rotating shaft (311); a plurality of magnetic blocks (313) are evenly distributed around the axis of the rotating shaft (311) at the end of the rotating shaft (311); a plurality of electromagnets (312) are distributed on one side of the magnetic blocks (313); the electromagnets (312) are arranged around the axis of the rotating shaft (311); and the energizing logic of the electromagnets (312) is to energize them sequentially.

4. The self-cleaning low-temperature dehydration tower for removing combined phosphorus according to claim 3, characterized in that: A ratchet (34) is fixedly provided at the end of the rotating shaft (311), a rotating ring (35) is rotatably provided on the periphery of the ratchet (34), the shielding plate (33) is fixedly provided on the rotating ring (35), and a plurality of extension claws (351) are fixedly provided on the inner ring of the rotating ring (35), the extension claws (351) are evenly arranged around the axis of the rotating ring (35), the ends of the extension claws (351) extend to one side of the ratchet (34) and contact the ratchet (34), the extension claws (351) and the ratchet (34) are unidirectionally rotated together, the extension claws (351) are made of elastic material, and a limit block (36) is fixedly provided inside the covering shell (32), the limit block (36) is located on one side of the opening of the covering shell (32), and the limit block (36) is located on the rotation path of the shielding plate (33).

5. The self-cleaning low-temperature dehydration tower for removing combined phosphorus according to claim 3, characterized in that: The drive unit (4) includes a drive shaft (41) vertically rotatably arranged in the tower body (1), a covering shell (32) fixedly arranged on the side wall of the drive shaft (41), an upper fixed sleeve of the drive shaft (41) is provided with a gear ring (42), one side of the gear ring (42) is meshed with a gear (43), and the upper end of the gear (43) is provided with a rotary driver (44) for driving the gear (43) to rotate.

6. A self-cleaning low-temperature dehydration tower for removing combined phosphorus according to claim 5, characterized in that: A first ventilation groove (45) is vertically provided in the driving shaft (41), a second ventilation groove (46) is provided in the rotating shaft (311) along the axial direction of the rotating shaft (311), the first ventilation groove (45) and the second ventilation groove (46) are communicated with each other, a push plate (47) is vertically provided in the first ventilation groove (45), a limiting ring (48) is fixedly provided above and below the push plate (47), and the push plate (47) moves between the two limiting rings (48) in the vertical direction, an air pump (49) connected to the first ventilation groove (45) is provided on the upper part of the first ventilation groove (45), a sliding groove is provided on the rotating shaft (311) along the radial direction of the rotating shaft (311), and the cleaning plate (31) is slidably provided on the sliding groove.

7. The self-cleaning low-temperature dehydration tower for removing combined phosphorus according to claim 5, characterized in that: A driving rod (441) is vertically fixedly provided on the output end of the rotary driver (44). The horizontal cross-section of the driving rod (441) is a non-circular structure. The driving rod (441) vertically penetrates the gear (43) and slides with the gear (43) in a vertical direction.

8. The self-cleaning low-temperature dehydration tower for removing combined phosphorus according to claim 1, characterized in that: The lifting unit (5) includes a winder (51) arranged on the upper part of the tower body (1), a lifting rope (53) is wound inside the winder (51), a lifting frame (52) is arranged to move in the vertical direction inside the tower body (1), a driving unit (4) is arranged on the lifting frame (52), and an end of the lifting rope (53) extending from the winder (51) is fixedly connected to the lifting frame (52).

9. The self-cleaning low-temperature dehydration tower for removing combined phosphorus according to claim 1, characterized in that: A plurality of air inlet pipes (11) are vertically arranged at the bottom of the tower body (1), and the air inlet pipes (11) introduce the gas containing diphosphorus into the tower body (1). A fan (12) is arranged at the top of the tower body (1), and the fan (12) is used to discharge the air in the tower body (1).

10. The self-cleaning low-temperature dehydration tower for removing combined phosphorus according to claim 9, characterized in that: A shielding cap (13) is provided on the upper portion of the air inlet pipe (11), and the shielding cap (13) is a conical structure. A switch valve (14) is provided at the bottom of the tower body (1).

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