A SAP particle drying tower

Abstract

This application relates to the field of particulate drying, and particularly to a SAP particle drying tower, which includes a cylinder body, a feed pipe for feeding resin particles into the cylinder body, a discharge pipe for discharging resin particles from the cylinder body, an air inlet pipe for sending hot air flow into the cylinder body, an exhaust pipe for discharging the hot air flow, several centrifugal nets rotatably connected inside the cylinder body. The centrifugal nets are concave downward and are provided with several mesh openings penetrating through the upper periphery. A plurality of centrifugal bars are detachably connected to the inner surface of the concave part of the centrifugal nets. Each centrifugal bar corresponds to a mesh opening. The centrifugal bars are inclined and the end of the centrifugal bar that is closer to the direction of rotation of the centrifugal net is far away from the mesh opening. So that even if a small amount of resin particles accumulate in the centrifugal net, the centrifugal bars will drive the resin particles to rotate synchronously with the centrifugal net, so that the resin particles can flow smoothly in the cylinder body and reduce the impact on the overall production efficiency.

Description

Technical Field

[0001] This application relates to the field of particulate drying, and particularly to a SAP particle drying tower. Background Art

[0002] SAP, namely superabsorbent resin, undergoes steps such as neutralization, polymerization, granulation, and drying during the manufacturing process. In the past, resin particles were fed into the corresponding drying equipment batch by batch during the drying process. In order to improve the drying efficiency and thus the overall production efficiency, continuous drying equipment is now used, so that while the resin particles are continuously fed, the dried materials can be continuously discharged.

[0003] For example, in a polyphenylene sulfide resin continuous drying device with the publication number CN115773649A, resin particles are fed into the upper part of the cylinder through a feed pipe, hot air is fed into the lower part of the cylinder and discharged from the upper part of the cylinder. At the same time, a plurality of rotatable conical nets and concentrator nets are distributed in the cylinder. The conical nets and concentrator nets are both concave downward to extend the residence time of the resin particles in the cylinder. While preventing the resin particles from being discharged from the cylinder too quickly, the hot air can also pass through the conical nets and concentrator nets to dry the resin particles.

[0004] Regarding the above related technology, the feed pipe is close to the concave bottom of the conical net so that the resin particles can stably fall into the conical net. However, this also causes the end opening of the feed pipe to be blocked by the accumulated resin particles when there is less resin particles accumulated at the bottom of the conical net, resulting in an increase in the pressure between the inside of the feed pipe and the conical net. Only after the accumulated resin particles reach a relatively large weight will they rotate along with the rotation of the conical net, so that the upper resin particles can be sent out from the material opening at the upper part of the conical net under the action of centrifugal force, resulting in the resin particles not moving smoothly in the cylinder, and thus affecting the overall production efficiency of the resin particles. Summary of the Invention

[0005] In order not to significantly affect the overall production efficiency of the resin particles, this application provides a SAP particle drying tower.

[0006] A SAP particle drying tower provided by this application adopts the following technical solutions.

[0007] A SAP particle drying tower includes a cylinder, a feed pipe for feeding resin particles into the cylinder, a discharge pipe for discharging resin particles from the cylinder, an air inlet pipe for feeding hot air into the cylinder, an exhaust pipe for discharging hot air, and several centrifugal nets rotatably connected inside the cylinder. The centrifugal nets are concave downward and are provided with several net openings penetrating through the upper periphery. A plurality of centrifugal bars are detachably connected to the inner surface of the concave part of the centrifugal net. Each centrifugal bar corresponds to a net opening. The centrifugal bars are inclined and the end of the centrifugal bar that is in front in the direction of rotation of the centrifugal net is far away from the net opening.

[0008] By adopting the above technical solution, the feed pipe initially feeds resin particles into the centrifugal screen. When the accumulation amount of resin particles is small, due to the existence of the centrifugal strips, the resin particles can still rotate synchronously with the rotation of the centrifugal screen stably, so that the resin particles can effectively enter the mesh openings for movement, so that the resin particles can be fed into the centrifugal screen from the feed pipe more smoothly, and it is not easy to have blockage of resin particles, which helps to reduce the influence on the overall production speed of resin particles.

[0009] Optionally, there is a concentration screen directly below each of the centrifugal screens. The concentration screen is concave, and the lowest point at the center of the concentration screen is communicated with a concentration pipe. One end of the concentration pipe far from the connected concentration screen is close to the concave bottom of the centrifugal screen. Each concentration pipe is detachably connected to an air ring pipe communicated with the air inlet pipe. The air ring pipe is communicated with several branch pipes around the concentration pipe. The concentration pipe is detachably connected with a air distribution plate which is located between the corresponding air ring pipe and the concentration screen and is densely provided with holes.

[0010] By adopting the above technical solution, the hot air flow in the cylinder can be distributed more evenly to dry the resin particles more fully.

[0011] Optionally, the air ring pipe is communicated with an inner pipe which penetrates into the inside of the concentration pipe, and the air outlet of the inner pipe faces the end of the concentration pipe communicated with the concentration screen.

[0012] By adopting the above technical solution, when it is necessary to accelerate the moving speed of resin particles in the cylinder, resin particles accumulate at the connection of the concentration screen and the concentration pipe, resulting in difficulty for the resin particles to fall smoothly. The setting of the inner pipe can use the hot air flow of the air ring pipe to blow the resin particles accumulated at the bottom of the concentration screen. As long as the accumulated resin particles are slightly loosened, the resin particles can continue to fall.

[0013] Optionally, the part of the inner pipe located in the concentration screen is formed into a U-shaped section, and the bent part of the U-shaped section is the lowest point of the U-shaped section.

[0014] By adopting the above technical solution, it can prevent resin particles from entering the air ring pipe through the inner pipe, so that the hot air flow can flow smoothly in the air ring pipe.

[0015] Optionally, the cylinder includes several sub-cylinders. A centrifugal screen and a concentration screen are arranged in each sub-cylinder. The concentration pipe of the sub-cylinder with a higher position penetrates into the sub-cylinder with a lower position, and the upper part of each sub-cylinder is communicated with an exhaust pipe.

[0016] By adopting the above technical solution, the water vapor in each sub-cylinder can be discharged separately, and it is not easy to have more water vapor accumulated in the upper part of the whole cylinder, which helps to improve the drying efficiency and effect of resin particles.

[0017] Optionally, the inner diameter of the central pipe is gradually changed, and the inner diameter of the bottom end of the central pipe is smaller than that of the upper end of the central pipe.

[0018] By adopting the above technical solution, it is possible to make the water vapor in the lower separating cylinder less likely to enter the higher separating cylinder through the central pipe, so that the water vapor in the higher separating cylinder can be discharged more effectively, and the drying efficiency and effect of the resin particles can be better improved.

[0019] Optionally, a bottom pipe that sends out air flow and opens at the bottom end of the central pipe is connected to the lowest part of the U-shaped section.

[0020] By adopting the above technical solution, on the one hand, the possibility of resin particle blockage at the bottom end with a smaller inner diameter of the central pipe is reduced, and on the other hand, the possibility of water vapor in the lower separating cylinder entering the higher separating cylinder through the central pipe is further reduced.

[0021] Optionally, all the separating cylinders are located on the same vertical line, and barrel plates can be detachably connected to the adjacent surfaces of two adjacent separating cylinders, and a support rod is fixedly connected between the two adjacent barrel plates.

[0022] By adopting the above technical solution, it is possible to make all the separating cylinders not occupy too much space, and the separating cylinders can be stably supported.

[0023] Optionally, the part of the central pipe outside the separating cylinder is coated with a heat insulation layer that can reduce heat loss at the central pipe.

[0024] By adopting the above technical solution, it is possible to make the central pipe not have too much heat loss, so as to better maintain the temperature in each separating cylinder and help reduce energy consumption.

[0025] Optionally, each centrifugal net is coaxially and detachably connected with a net gear, the cylinder body is detachably connected with a centrifugal motor, the output shaft of the centrifugal motor is coaxially and detachably connected with a power rod, and the power rod is coaxially and fixedly connected with several rod gears that are respectively engaged with each net gear.

[0026] By adopting the above technical solution, it is possible to make all the centrifugal nets rotate synchronously.

[0027] In summary, the present application has at least the following beneficial effects.

[0028] The feed pipe initially sends the resin particles into the centrifugal net. When the accumulation amount of the resin particles is small, due to the existence of the centrifugal strips, the resin particles can still rotate synchronously with the rotation of the centrifugal net stably, so that the resin particles can effectively enter the mesh openings and move, so that the resin particles can be more smoothly sent from the feed pipe into the centrifugal net, and it is not easy to have resin particle blockage, which helps to reduce the influence on the overall production speed of the resin particles. Description of the Drawings

[0029] Figure 1 is a schematic structural view of the overall internal and external related structures of this application in cross-section;

[0030] Figure 2 is a schematic cross-sectional view of a split cylinder.

[0031] Explanation of reference numerals: 1, cylinder body; 2, feed pipe; 3, discharge pipe; 31, heat insulation layer; 4, inlet air pipe; 41, U-shaped section; 42, bottom pipe of the section; 43, split cylinder; 44, cylinder plate; 45, support rod; 46, mesh gear; 47, centrifugal motor; 48, power rod; 49, rod gear; 5, exhaust pipe; 51, centrifugal mesh; 52, mesh opening; 53, centrifugal strip; 54, concentrated mesh; 55, concentrated pipe; 56, air ring pipe; 57, branch pipe; 58, air distribution plate; 59, inner pipe. Detailed implementation manners

[0032] The following further details this application with reference to the accompanying drawings.

[0033] An embodiment of this application discloses a SAP particle drying tower. Referring to Figure 1 , it includes a cylinder body 1. The upper part of the cylinder body 1 is connected to a feed pipe 2. The feed pipe 2 can send resin particles into the cylinder body 1 through pneumatic conveying or screw conveyor using hot air flow. The bottom of the cylinder body 1 is connected to a discharge pipe 3 for sending out the dried resin particles. The cylinder body 1 is connected to an inlet air pipe 4 that can be connected to an external hot air blower, so that the inlet air pipe 4 can send hot air flow into the cylinder body 1. The upper part of the cylinder body 1 is connected to an exhaust pipe 5 for discharging water vapor.

[0034] Referring to Figure 1 and Figure 2 , the cylinder body 1 includes several split cylinders 43 evenly distributed at equal intervals in the vertical direction. Removable cylinder plates 44 are connected to the surfaces of adjacent split cylinders 43. Two cylinder plates 44 can be arranged on the surface of each split cylinder 43 facing the adjacent split cylinder 43. A vertical support rod 45 is fixedly connected between two adjacent cylinder plates 44 in the vertical direction. A centrifugal mesh 51 is rotatably connected in each split cylinder 43. The rotation axis of the centrifugal mesh 51 is the vertical center line of the split cylinder 43. The feed pipe 2 is only connected to the upper part of the split cylinder 43 with the highest height. At the same time, the centrifugal mesh 51 is concave. The opening of the end of the feed pipe 2 for sending out resin particles is close to the bottom of the concave inner surface of the corresponding centrifugal mesh 51, so that the resin particles can stably fall into the centrifugal mesh 51. And the aperture of the holes on the centrifugal mesh 51 is small enough to block the resin particles from passing through. Several mesh openings 52 are evenly penetrated around the upper periphery of each centrifugal mesh 51 along its rotation axis for the resin particles to pass through and fall.

[0035] Referring to Figure 1, a net gear 46 is coaxially and fixedly connected to the upper part of each centrifugal net 51. The height of the net gear 46 is higher than that of the net opening 52. A centrifugal motor 47 is detachably connected to the outer wall of the peripheral part of the lowest sub-cylinder 43. The output shaft of the centrifugal motor 47 is coaxially and detachably connected to a power rod 48. Each sub-cylinder 43 can be provided with a bearing seat for the power rod 48 to be rotatably connected. The power rod 48 is coaxially and fixedly connected to a rod gear 49 corresponding to each net gear 46, and each rod gear 49 meshes with the corresponding net gear 46.

[0036] Refer to Figure 2 , several centrifugal bars 53 are fixedly connected to the concave inner surface of each centrifugal net 51. The centrifugal bars 53 are inclined. The end of the centrifugal bar 53 that is closer to the position in the rotation direction of the centrifugal net 51 is far from the net opening 52. The upper end of each centrifugal bar 53 is located at one end of the corresponding net opening 52. The end of the net opening 52 close to the centrifugal bar 53 is at the rear position in the rotation direction of the centrifugal net 51. So that during the rotation of the centrifugal net 51, even if there are only a small amount of resin particles, the centrifugal bars 53 can drive the resin particles to rotate effectively, so that the resin particles enter the net opening 52 under the action of centrifugal force and fall.

[0037] Refer to Figure 1 and Figure 2 , a central net 54 is fixedly connected to each sub-cylinder 43. The central net 54 is concave and located below the centrifugal net 51, so that the resin particles falling from the net opening 52 fall into the concave inner wall of the central net 54. The aperture of the holes in the central net 54 is also small enough to prevent the resin particles from passing through. A central pipe 55 is connected to the center of the concave part of the central net 54 and is vertically arranged. The central pipe 55 passes through the bottom of the corresponding sub-cylinder 43 and enters the sub-cylinder 43 with a lower height adjacent to it, so that the bottom opening of the central pipe 55 of the sub-cylinder 43 with a higher height can be close to the concave inner bottom surface of the centrifugal net 51 in the sub-cylinder 43 with a lower height, so that the resin particles are not likely to fall to the position of the centrifugal net 51 where the net gear 46 is arranged. The central pipe 55 in the lowest sub-cylinder 43 does not need to penetrate through the corresponding sub-cylinder 43.

[0038] Refer to Figure 1 and Figure 2 , the upper part of each sub-cylinder 43 is communicated with an exhaust pipe 5, so that the hot air in each sub-cylinder 43 can be discharged separately and in time. And, the inner diameter of the central pipe 55 changes gradually. The inner diameter of the upper end of the central pipe 55 is larger than the inner diameter of the lower end of the central pipe 55, so as to further reduce the water vapor in the sub-cylinder 43 with a lower height from entering the sub-cylinder 43 with a higher height. Since a part of the central pipe 55 is exposed outside the sub-cylinder 43, a heat insulation layer 31 made of foam glass or polyurethane foam is coated on the exposed part of each central pipe 55 to reduce the heat loss at the central pipe 55.

[0039] Refer to Figure 2, each part of the central pipe 55 located at the bottom of the sub-cylinder 43 is fixedly connected with an air ring pipe 56 located below the central net 54. Several branch pipes 57 are connected around the vertical center line of the central pipe 55 at the upper part of the air ring pipe 56. The central pipe 55 is fixedly connected with a blast plate 58 with dense holes. The periphery of the blast plate 58 is fixedly connected to the inner wall of the sub-cylinder 43, so that the hot air flow in each sub-cylinder 43 is more uniform. Each air ring pipe 56 is fixedly connected with several inner pipes 59 around the vertical center line of the central pipe 55 evenly. The inner pipes 59 penetrate into the adjacent central pipe 55. The part of the inner pipe 59 located in the central pipe 55 is formed into a U-shaped section 41. The bending part of the U-shaped section 41 is the lowest part of itself. The upper end opening of the U-shaped section 41 is close to the position where the central pipe 55 communicates with the central net 54. When it is necessary to make the lower part of the concave part of the centrifugal net 51 close to the lower concave inner bottom surface of the central net 54 in order to reduce the space in the sub-cylinder 43, the upper end opening of the U-shaped section 41 can send out air flow to blow the resin particles between the central net 54 and the central pipe 55, so as to increase the throughput of the resin particles.

[0040] Refer to Figure 2 , the lowest bending part of the U-shaped section 41 is communicated with a bottom pipe 42. The bottom pipe 42 can send out hot air flow downward to the bottom end of the central pipe 55, so as to reduce the possibility of resin particle blockage at the bottom end with a smaller inner diameter of the central pipe 55. At the same time, it can also reduce the possibility that the water vapor in the lower sub-cylinder 43 enters the higher sub-cylinder 43 through the central pipe 55. The bottom end opening of the bottom pipe 42 is close to the bottom end opening of the central pipe 55, so that the bottom end of the central pipe 55 with a smaller inner diameter is not easy to be blocked when facing a large amount of resin particle flow.

[0041] The implementation principle of a SAP particle drying tower according to an embodiment of the present application is as follows: Resin particles are sent into the sub-cylinder 43 with the highest height through the feed pipe 2 and fall to the bottom of the concave part of the centrifugal net 51. Then, the rotating centrifugal net 51 makes the resin particles sent out from the mesh opening 52 and fall onto the central net 54, and then fall through the central pipe 55 into the centrifugal net 51 in the next sub-cylinder 43, and continuously fall until finally fall from the central pipe 55 in the lowest sub-cylinder 43 into the discharge pipe 3, so that the resin particles complete continuous drying.

[0042] The above are all the preferred embodiments of the present application. The protection scope of the present application is not limited by this. Therefore, all equivalent changes made according to the structure, shape and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A SAP particle drying tower, comprising a cylinder body (1), a feed pipe (2) for feeding resin particles into the cylinder body (1), a discharge pipe (3) for discharging resin particles from the cylinder body (1), an air inlet pipe (4) for feeding hot air flow into the cylinder body (1), an exhaust pipe (5) for discharging the hot air flow, and several centrifugal nets (51) rotatably connected inside the cylinder body (1), the centrifugal nets (51) being concave downward and having several mesh openings (52) penetrating through the upper periphery thereof, characterized in that: The concave inner surface of the centrifugal net (51) is detachably connected with several centrifugal bars (53). Each centrifugal bar (53) corresponds to a mesh opening (52). The centrifugal bars (53) are inclined, and the end of the centrifugal bar (53) that is closer to the rotation direction of the centrifugal net (51) is far from the mesh opening (52). There is a concentrator net (54) directly below each centrifugal net (51). The concentrator net (54) is concave, and the lowest point in the center of the concentrator net (54) is connected with a concentrator pipe (55). One end of the concentrator pipe (55) far from the connected concentrator net (54) is close to the concave bottom of the centrifugal net (51). Each concentrator pipe (55) is detachably connected with an air ring pipe (56) communicating with the intake pipe (4). The air ring pipe (56) is connected with several branch pipes (57) surrounding the concentrator pipe (55). The concentrator pipe (55) is detachably connected with a air distribution plate (58) located between the corresponding air ring pipe (56) and the concentrator net (54) and densely distributed with holes. The air ring pipe (56) is connected with an inner pipe (59) passing through and entering the interior of the concentrator pipe (55). The air outlet of the inner pipe (59) is directly opposite to the end of the concentrator pipe (55) connected with the concentrator net (54). The part of the inner pipe (59) located in the concentrator net (54) is formed into a U-shaped section (41), and the bent part of the U-shaped section (41) is the lowest point of the U-shaped section (41). The cylinder body (1) includes several sub-cylinders (43). Each sub-cylinder (43) is provided with a centrifugal net (51) and a concentrator net (54). The concentrator pipe (55) of the sub-cylinder (43) at a higher position passes through and enters the sub-cylinder (43) at a lower position. The upper part of each sub-cylinder (43) is connected to the exhaust pipe (5). The inner diameter of the concentrator pipe (55) is gradually changed, and the inner diameter of the bottom end of the concentrator pipe (55) is smaller than the inner diameter of the upper end of the concentrator pipe (55). The lowest point of the U-shaped section (41) is connected with a bottom pipe (42) that sends out air flow opening towards the bottom end of the concentrator pipe (55).

2. The SAP particle drying tower according to claim 1, wherein: All the sub-cylinders (43) are located on the same vertical line. The adjacent surfaces of the adjacent two sub-cylinders (43) are detachably connected with cylinder plates (44), and a support rod (45) is fixedly connected between the two adjacent cylinder plates (44).

3. A SAP particle drying tower according to claim 1, characterized in that: The part of the concentrator pipe (55) located outside the sub-cylinder (43) is coated with a heat insulation layer (31) that can reduce heat dissipation at the concentrator pipe.

4. A SAP particle drying tower according to claim 1, characterized in that: Each centrifugal net (51) is coaxially and detachably connected with a net gear (46). The cylinder body (1) is detachably connected with a centrifugal motor (47). The output shaft of the centrifugal motor (47) is coaxially and detachably connected with a power rod (48). The power rod (48) is coaxially and fixedly connected with several rod gears (49) that are meshed with each net gear (46) one by one.

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