SAP particle drying tower

Abstract

The invention relates to the field of particle drying, in particular to an SAP particle drying tower which comprises a barrel, a feeding pipe for feeding resin particles into the barrel, a discharging pipe for discharging the resin particles out of the barrel, an air inlet pipe for feeding hot airflow into the barrel, an exhaust pipe for discharging the hot airflow and a plurality of centrifugal nets rotationally connected to the interior of the barrel. The centrifugal net is concave downwards, a plurality of net openings are formed in the periphery of the upper portion of the centrifugal net in a penetrating mode, a plurality of centrifugal strips are detachably connected to the concave inner surface of the centrifugal net, each centrifugal strip corresponds to one net opening, the centrifugal strips are inclined, and the front ends of the centrifugal strips in the rotating direction of the centrifugal net are far away from the net openings. Even if a small number of resin particles are accumulated in the centrifugal net, the centrifugal strips can drive the resin particles to synchronously rotate along with the centrifugal net, so that the resin particles smoothly flow in the barrel, and the influence on the overall production efficiency is reduced.

Description

Technical Field

[0001] The present 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 put into 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 flow 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 centralized nets are distributed in the cylinder. The conical nets and centralized 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 flow can also pass through the conical nets and centralized 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 large weight, the accumulated resin particles will rotate with the rotation of the conical net, so that the upper resin particles can be sent out from the material outlet 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 greatly affect the overall production efficiency of the resin particles, the present application provides a SAP particle drying tower.

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

[0007] A SAP particle drying tower 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 feeding hot air flow into the cylinder body, an exhaust pipe for discharging the hot air flow, and 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 in the front position along the rotation direction of the centrifugal net is far away from the mesh 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 and move, 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 centrifugal screen. The concentration screen is concave, and the lowest part of 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 to a air distribution plate located between the corresponding air ring pipe and the concentration screen and densely covered with holes.

[0010] By adopting the above technical solution, the hot air flow in the cylinder is made more uniform to dry the resin particles more fully.

[0011] Optionally, the air ring pipe is communicated with an inner pipe that penetrates into the interior 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, making it difficult 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 part of the U-shaped section.

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

[0015] Optionally, the cylinder includes several sub-cylinders. Each sub-cylinder is provided with a centrifugal screen and a concentration screen. 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 the 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 then 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 separation cylinder less likely to enter the higher separation cylinder through the central pipe, so that the water vapor in the higher separation cylinder can be discharged more effectively, and the drying efficiency and effect of the resin particles can be better improved.

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

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

[0021] Optionally, all the separation cylinders are located on the same vertical line, and the adjacent two separation cylinders are detachably connected with cylinder plates on the adjacent surfaces, and a support rod is fixedly connected between the two adjacent cylinder plates.

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

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

[0024] By adopting the above technical solution, it is possible to make the heat loss at the central pipe less, so as to better maintain the temperature in each separation 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 meshed 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 stably rotate synchronously with the rotation of the centrifugal net, so that the resin particles can effectively enter the mesh opening 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 the present application in cross-section; Figure 2 is a schematic cross-sectional structural view of a sub-cylinder.

[0030] 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 section; 43, sub-cylinder; 44, cylinder plate; 45, support rod; 46, mesh gear; 47, centrifugal motor; 48, power rod; 49, rod gear; 5, exhaust pipe; 51, centrifugal net; 52, net opening; 53, centrifugal strip; 54, concentrated net; 55, concentrated pipe; 56, air ring pipe; 57, branch pipe; 58, air distribution plate; 59, inner pipe. Detailed implementation manners

[0031] The present application will be further described in detail below with reference to the accompanying drawings.

[0032] An embodiment of the present 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 communicated with a feed pipe 2. The feed pipe 2 can convey resin particles into the cylinder body 1 through pneumatic conveying or auger conveying using hot air flow. The bottom of the cylinder body 1 is communicated with a discharge pipe 3 for sending out the dried resin particles. The cylinder body 1 is communicated with 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 communicated with an exhaust pipe 5 for discharging water vapor.

[0033] Referring to Figure 1 and Figure 2 , the cylinder body 1 includes several sub-cylinders 43 evenly distributed at equal intervals in the vertical direction. Removable cylinder plates 44 are connected to the surfaces of adjacent two sub-cylinders 43. Two cylinder plates 44 can be arranged on the surface of each sub-cylinder 43 facing the adjacent sub-cylinder 43. A vertical support rod 45 is fixedly connected between two adjacent cylinder plates 44 in the vertical direction. A centrifugal net 51 is rotatably connected in each sub-cylinder 43. The rotation axis of the centrifugal net 51 is the vertical center line of the sub-cylinder 43. The feed pipe 2 is only communicated with the upper part of the sub-cylinder 43 with the highest height. At the same time, the centrifugal net 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 net 51, so that the resin particles can stably fall into the centrifugal net 51. And the aperture of the holes on the centrifugal net 51 is small enough to block the resin particles from passing through. Several net openings 52 are evenly penetrated through the periphery of the upper part of each centrifugal net 51 around its rotation axis for the resin particles to pass through and fall.

[0034] 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 separation cylinder 43. The output shaft of the centrifugal motor 47 is coaxially and detachably connected to a power rod 48. Each separation 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.

[0035] 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 forward 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 and fall under the action of centrifugal force.

[0036] Refer to Figure 1 and Figure 2 , a centralized net 54 is fixedly connected in each separation cylinder 43. The centralized 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 centralized net 54. The aperture of the holes in the centralized net 54 is also small enough to prevent the resin particles from passing through. A centralized pipe 55 is connected to the center of the concave part of the centralized net 54 and is vertically arranged. The centralized pipe 55 penetrates through the bottom of the corresponding separation cylinder 43 and enters the separation cylinder 43 with a lower height at the adjacent level, so that the bottom opening of the centralized pipe 55 of the separation cylinder 43 with a higher height can be close to the concave inner bottom surface of the centrifugal net 51 in the separation cylinder 43 with a lower height, so that the resin particles are not likely to fall to the position where the net gear 46 is arranged on the centrifugal net 51. The centralized pipe 55 in the separation cylinder 43 with the lowest height does not need to penetrate through the corresponding separation cylinder 43.

[0037] Refer to Figure 1 and Figure 2 , the upper part of each separation cylinder 43 is communicated with an exhaust pipe 5, so that the hot air in each separation cylinder 43 can be discharged separately and in time. And, the inner diameter of the centralized pipe 55 changes gradually. The inner diameter of the upper end of the centralized pipe 55 is larger than that of the lower end of the centralized pipe 55, so as to further reduce the water vapor in the separation cylinder 43 with a lower height from entering the separation cylinder 43 with a higher height. Since a part of the centralized pipe 55 is exposed outside the separation cylinder 43, a heat insulation layer 31 made of foam glass or polyurethane foam is coated on the exposed part of each centralized pipe 55 to reduce the heat loss at the centralized pipe 55.

[0038] Refer to Figure 2, each part of the central pipe 55 located at the bottom of the separation 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 on 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 separation cylinder 43, so that the hot air flow in each separation 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 inner bottom surface of the central net 54 in order to reduce the space in the separation 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.

[0039] Refer to Figure 2 , the lowest bending part of the U-shaped section 41 is connected 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 of the smaller inner diameter of the central pipe 55. At the same time, it can also reduce the possibility of water vapor in the lower separation cylinder 43 entering the higher separation 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.

[0040] 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 separation 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. Then, they fall through the central pipe 55 into the centrifugal net 51 in the next separation cylinder 43. Finally, they continuously fall from the central pipe 55 in the lowest separation cylinder 43 into the discharge pipe 3, so that the resin particles complete continuous drying.

[0041] The above are all preferred embodiments of the present application. The protection scope of the present application is not limited accordingly. 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 (1), a feed pipe (2) for feeding resin particles into the cylinder (1), a discharge pipe (3) for sending the resin particles out of the cylinder (1), an air inlet pipe (4) for feeding a hot air flow into the cylinder (1), an exhaust pipe (5) for sending the hot air flow out, and a plurality of centrifugal nets (51) rotatably connected to the inside of the cylinder (1), wherein the centrifugal nets (51) are concave and have a plurality of net openings (52) formed on the periphery of the upper part, and characterized in that: The concave inner surface of the centrifugal net (51) is detachably connected to a plurality of centrifugal bars (53), each of which corresponds to a net opening (52). The centrifugal bars (53) are inclined, and the front end of the centrifugal bars (53) that is located in the direction of rotation of the centrifugal net (51) is away from the net opening (52).

2. A SAP granule drying tower according to claim 1, characterized in that: There is a concentrating net (54) directly below each centrifugal net (51). The concentrating net (54) is concave and the lowest point in the center of the concentrating net (54) is connected to a concentrating pipe (55). One end of the concentrating pipe (55) away from the concentrating net (54) to which it is connected is close to the concave bottom of the centrifugal net (51). Each concentrating pipe (55) is detachably connected to an air ring pipe (56) connected to an air inlet pipe (4). The air ring pipe (56) surrounds the concentrating pipe (55) and is connected to a plurality of branch pipes (57). The concentrating pipe (55) is detachably connected to an air distribution plate (58) densely covered with holes and located between the corresponding air ring pipe (56) and the concentrating net (54).

3. A SAP granule drying tower according to claim 2, characterized in that: The air ring pipe (56) is connected to an inner pipe (59) that penetrates into the interior of the centralizing pipe (55), and an air outlet of the inner pipe (59) is connected to one end of the centralizing network (54) directly opposite to the centralizing pipe (55).

4. A SAP granule drying tower according to claim 3, characterized in that: The portion of the inner tube (59) located in the concentrating net (54) is formed into a U-shaped segment (41), and the bent portion of the U-shaped segment (41) is the lowest point of the U-shaped segment (41).

5. The SAP granule drying tower according to claim 4, characterized in that: The cylinder body (1) comprises a plurality of sub-cylinders (43), each of which is provided with a centrifugal net (51) and a concentrating net (54), the concentrating pipe (55) of the higher sub-cylinder (43) penetrates into the lower sub-cylinder (43), and the upper part of each sub-cylinder (43) is connected to the exhaust pipe (5).

6. The SAP granule drying tower according to claim 5, characterized in that: The inner diameter of the concentrating tube (55) changes gradually, and the inner diameter of the bottom end of the concentrating tube (55) is smaller than the inner diameter of the top end of the concentrating tube (55).

7. A SAP granule drying tower according to claim 6, characterized in that: The lowest point of the U-shaped section (41) is connected to a section bottom pipe (42) for delivering airflow to the bottom opening of the centralizing pipe (55).

8. The SAP granule drying tower according to claim 5, characterized in that: All of the sub-barrels (43) are located on the same vertical line, and adjacent surfaces of two adjacent sub-barrels (43) are detachably connected with a barrel plate (44), and a support rod (45) is fixedly connected between two adjacent barrel plates (44).

9. The SAP granule drying tower according to claim 5, characterized in that: The portion of the central tube (55) located outside the branch tube (43) is coated with a heat-insulating layer (31) capable of reducing heat loss at the central tube.

10. The SAP granule drying tower according to claim 1, characterized in that: Each centrifugal net (51) is coaxially and detachably connected to a net gear (46); the cylinder (1) is detachably connected to a centrifugal motor (47); the output shaft of the centrifugal motor (47) is coaxially and detachably connected to a power rod (48); the power rod (48) is coaxially and fixedly connected to a plurality of rod gears (49) that mesh with each net gear (46) in a one-to-one correspondence.

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