Polyester chip dehumidifying drying tower

Abstract

The utility model discloses a polyester chip dehumidification drying tower belongs to polyester production equipment technical field. From top to bottom includes drying section, cooling section and material collecting section in proper order, drying section is equipped with the circular tower body of gradually reducing diameter in proper order from top to bottom, and the lower end of each upper circular tower body is connected with the lower circular tower body through the conical contraction section respectively, the top of the uppermost end circular tower body is equipped with the central feed pipe and gas phase export, the lateral wall of each circular tower body is equipped with hot -blast import respectively, and is communicated with the tower body inner chamber through the distributor in the tower body, and cooling section includes the cylinder, the upper tube sheet of being located the cylinder upper end, the lower tube sheet of being located the cylinder lower end and the multiple heat exchange pipes of being installed vertically between the upper tube sheet and the lower tube sheet, and the cylinder is equipped with cooling medium import and export, and material collecting section is connected in the lower of cooling section and is equipped with the discharge gate at the bottom. This drying tower can remove moisture content efficiently, and can cool directly and quickly after drying, saves equipment investment and floor area, reduces operating cost.

Description

Technical Field

[0001] This utility model relates to a drying device, and more particularly to a dehumidifying drying tower for polyester chips, belonging to the technical field of polyester production equipment. Background Technology

[0002] Polyester chips are polyester raw materials produced by polymerizing low-molecular-weight organic compounds, and are typically processed into sheet-like granules. These chips are widely used as raw materials in the production of fibers, packaging materials, films, gels, and engineering plastics. After molding, polyester chips need to be dried to prevent high-temperature hydrolysis reactions that could affect the quality of subsequent spinning. On existing production lines, the chips are usually dehydrated and dried in a drying tower using hot dry gas as the medium. The chips dried at high temperatures then require cooling.

[0003] Existing drying towers typically employ a slender tower body and are equipped with a distributor to increase the contact opportunity between the falling chips and the rising hot dry gas. For example, Chinese utility model patent CN 204535328U discloses "a drying tower for nylon 6 chips," in which the distributor uses two concentric frustum cones to form an annular channel. At the annular channel, the chips convect with high-speed nitrogen gas, improving drying efficiency. However, its shortcomings are: 1. It requires a separate cooling device, and the material also needs to be transferred and transported; 2. For large-diameter drying towers, the distribution of chips and heating medium nitrogen is uneven, resulting in a decrease in drying efficiency.

[0004] The utility model patent with announcement number CN 207797679U discloses "a novel nylon polymer chip drying and cooling system". The drying tower and the cooling tower are connected by pipelines. The chips dried in the drying tower enter the cooling tower, and cold nitrogen gas is introduced into the cooling tower to cool the chips. Its shortcomings are: 1. The chips rely on gas cooling, which is slow and the cooling rate is uneven between the center and the edge of the container wall; 2. The drying tower and the cooling tower are set up separately, which occupies a large space. Utility Model Content

[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, and such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0006] In view of the problems existing in the above and / or prior art, this utility model is proposed.

[0007] The purpose of this invention is to overcome the problems existing in the prior art and provide a dehumidifying and drying tower for polyester chips, which can make the chips fully contact the hot dry airflow, efficiently remove moisture and dust from the chips, and directly and uniformly and quickly cool the chips after drying, saving equipment investment and floor space, and reducing operating costs.

[0008] To solve the above technical problems, this utility model provides a polyester chip dehumidification and drying tower, which includes a drying section, a cooling section and a material collection section from top to bottom. The drying section is provided with multiple circular towers with progressively smaller diameters from top to bottom. The lower ends of each upper circular tower are connected to the lower circular tower through a tapered contraction section that is wider at the top and narrower at the bottom. The top of the uppermost circular tower is provided with a central feed pipe and a gas phase outlet. Each of the circular towers is provided with a hot air inlet on its side wall, and the hot air inlet is connected to the inner cavity of the tower through a distributor located inside the tower. The cooling section includes a cylinder, an upper tube sheet located at the upper end of the cylinder, a lower tube sheet located at the lower end of the cylinder, and multiple heat exchange tubes vertically installed between the upper and lower tube sheets; the cylinder is provided with a cooling medium inlet and a cooling medium outlet. The material collection section is connected below the cooling section, and its bottom is provided with a discharge port.

[0009] Furthermore, the distributor includes a straight guide tube located inside the inner cavity of the circular tower body, the upper end of which is connected to the upper tower body, and the lower end is open; a central material dispensing cone is provided inside the straight guide tube; an annular channel with a closed upper end and an open lower end is formed between the outer wall of the straight guide tube and the inner wall of the circular tower body; the hot air inlet is connected to the annular channel.

[0010] Furthermore, the distributor includes an upper cone and a lower cone located coaxially within the inner cavity of the circular tower. The upper cone has a structure that is wider at the top and narrower at the bottom, while the lower cone has a structure that is narrower at the top and wider at the bottom. The connection between the two forms the most concave part of the distributor. A central feeding cone is provided inside the distributor. The outer walls of the upper and lower cones form an annular channel with a closed upper end and an open lower end between them and the inner wall of the circular tower. The axis of the hot air inlet is located on the same horizontal plane as the most concave part.

[0011] Furthermore, the distributor includes an upper conical cylinder, a middle cylindrical cylinder, and a lower conical cylinder located coaxially within the inner cavity of the circular tower. The upper conical cylinder has a structure that is wider at the top and narrower at the bottom, while the lower conical cylinder has a structure that is narrower at the top and wider at the bottom. The middle cylindrical cylinder connects the two. A central feeding cone is provided at the upper part of the inner cavity of the distributor. Multiple ventilation holes are provided on the wall of the middle cylindrical cylinder. An annular channel with a closed upper end and an open lower end is formed between the outer wall of the distributor and the inner wall of the circular tower. The hot air inlet is aligned with the middle cylindrical cylinder.

[0012] Furthermore, the distributor includes an outer cylinder, a middle cylinder, and an inner cylinder coaxially disposed within the inner cavity of the circular tower. The outer cylinder includes an outer upper conical cylinder, an outer middle cylindrical cylinder, and an outer lower conical cylinder that are connected as one piece. The outer middle cylindrical cylinder has an outer vent hole on its cylinder wall. The inner layer cylinder includes an inner upper conical cylinder, an inner middle cylindrical cylinder, and an inner lower conical cylinder that are connected as one piece. The inner middle cylindrical cylinder has an inner vent hole on its cylinder wall and a central material spreading cone at its center. The middle layer cylinder is located between the outer layer cylinder and the inner layer cylinder, and includes an upper conical cylinder, a middle section cylinder, and a lower conical cylinder that are connected as a single unit. The middle section cylinder has a ventilation hole on its wall. The top of the upper conical cylinder is connected to the top of the upper conical cylinder. A first annular channel is formed between the outer cylinder and the inner wall of the circular tower body; a second annular channel is formed between the outer cylinder and the middle cylinder, and a third annular channel is formed between the middle cylinder and the inner cylinder; a fourth annular channel is formed within the inner cavity of the inner cylinder; the hot air inlet points towards the middle section of the outer cylinder.

[0013] Furthermore, each tube sheet hole on the upper tube sheet is provided with a flared opening at its upper end, and the upper ends of adjacent flared openings are tangent to each other.

[0014] Furthermore, the cooling section has multiple baffles inside its cylinder.

[0015] Furthermore, the aggregate section has a tapered structure that is wider at the top and narrower at the bottom, and its upper port is connected to the lower tube sheet.

[0016] Compared with the prior art, the present invention has achieved the following beneficial effects: 1. Functional integration and compact layout: The two key process sections of drying and cooling are integrated into the same tower body, realizing continuous integrated operation of drying and cooling, which significantly reduces the equipment footprint and plant space requirements.

[0017] 2. Smooth process and energy saving: The material is conveyed by gravity from the drying section to the cooling section, eliminating the need for intermediate transfer equipment and its supporting power, simplifying the process and reducing equipment investment and operating energy consumption.

[0018] 3. High-efficiency drying and uniform air distribution: Multi-stage distributor structures (such as straight cylinder, conical cylinder, and combined cylinder with ventilation holes) are designed for different tower diameters, which effectively improves and ensures the uniform distribution of hot air across the entire tower cross section, prolongs the countercurrent contact time and contact effect between the slices and the hot air, and improves the dehydration efficiency and drying uniformity.

[0019] 4. Rapid, uniform, and controllable cooling: A water-cooled shell-and-tube heat exchanger is used as the cooling section. The slices are dispersed within numerous parallel heat exchange tubes, with the cooling medium flowing outside the tubes. This structure significantly increases the heat exchange area, resulting in high cooling intensity and speed. Simultaneously, the slices are cooled synchronously within multiple independent pipes, overcoming the problem of uneven cooling between the center and edges in traditional air cooling or large-space cooling methods, ensuring the uniformity and stability of material cooling.

[0020] 5. One tower with multiple diameters, strong adaptability: By configuring the drying section with selectable distributor types that adapt to different diameters, the same tower structure can be flexibly matched with different production scales and capacity requirements, improving the equipment's versatility and applicability. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. The drawings are provided for reference and illustration only and are not intended to limit this utility model. Wherein: Figure 1 This is a front view of Embodiment 1 of the polyester chip dehumidification and drying tower of this utility model; Figure 2 This is a schematic diagram of the distributor in Embodiment 2 of this utility model; Figure 3 This is a schematic diagram of the distributor in Embodiment 3 of this utility model; Figure 4 This is a schematic diagram of the distributor in Embodiment 4 of this utility model; Figure reference numerals: 1. Drying section; 1a. Central feed pipe; 1b. Gas phase outlet; 1c. Hot air inlet; 1d. Distributor: 1d1. Upper cone; 1d2. Lower cone; 1d3. Middle section cylinder; 1d4. Vent hole; 1d5. Outer upper cone; 1d6. Outer middle section cylinder; 1d7. Outer lower cone; 1d8. Outer vent; 1d9. Upper cone of the middle layer; 1d10. Middle section cylinder of the middle layer; 1d11. Lower cone of the middle layer; 1d12. Vent in the middle layer; 1d13. Inner upper conical cylinder; 1d14. Inner middle section cylinder; 1d15. Inner lower conical cylinder; 1d16. Inner vent; 1e. Center spreading cone; 2. Cooling section; 2a. Upper tube sheet; 2b. Heat exchange tubes; 2c. Lower tube sheet; 2d. Cooling medium inlet; 2e. Cooling medium outlet; 2f. Baffle plate; 3. Gathering section; 3a. Discharge port. Detailed Implementation

[0022] To make the technical means, creative features, achieved objectives and effects of this utility model easier to understand, the present utility model will be further described below with reference to specific illustrations. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0024] like Figure 1 As shown, the polyester chip dehumidification drying tower of this utility model includes a drying section 1, a cooling section 2 and a collection section 3 from top to bottom. The drying section 1 is provided with multiple circular tower bodies with progressively smaller diameters from top to bottom. The lower ends of each upper circular tower body are connected to the lower circular tower body through a tapered contraction section that is wider at the top and narrower at the bottom. The uppermost circular tower body has the largest diameter and is provided with an upper end cap. A central feed pipe 1a is provided at the center of the upper end cap, and a gas phase outlet 1b is provided on one side of the central feed pipe 1a.

[0025] Each circular tower body in the drying section 1 is provided with a hot air inlet 1c on its side wall. The hot air entering from the hot air inlet 1c is uniformly introduced into the inner cavity of the circular tower body through the corresponding distributor 1d.

[0026] Polyester chips enter the inner cavity of drying section 1 through the central feed pipe 1a at the top and fall under gravity. A central spreading cone 1e is set below the central feed pipe 1a to facilitate the polyester chips falling onto the cone and splashing outwards. Drying hot nitrogen gas enters through the hot air inlet 1c and is evenly distributed into the inner cavity of the circular tower through the distributor 1d. It flows upward along the cross-section of the circular tower and faces the falling polyester chips. Due to the low density of the polyester chips, they fly in a boiling state under the blowing of the hot nitrogen gas. The gas phase heats the polyester chips as it flows upward and contacts them in a countercurrent, gradually removing moisture from the polyester chips and carrying away fine dust.

[0027] After drying in the previous section, the polyester chips pass through the conical shrinkage section and enter the next circular tower section, where they continue to be dried by the hot nitrogen gas that just entered. Finally, the polyester chips are discharged from the last section of drying section 1 and enter cooling section 2. The hygroscopic hot nitrogen gas is finally discharged from the top gas phase outlet 1b.

[0028] The distributor 1d can have various structural forms. Figure 1The diagram shows the first type of distributor, employing a straight guide tube structure. The straight guide tube is located within the inner cavity of the circular tower body, with its upper end smoothly connected to the upper tower body. The straight guide tube extends downwards and is open at its lower end. The central feeding cone 1e is a right circular cone structure, narrow at the top and wide at the bottom, located at the center of the straight guide tube. Both the central feeding cone 1e and the straight guide tube are coaxial with the circular tower body. Preferably, the lower end of the straight guide tube is flush with the lower end of the circular tower body. An annular channel is formed between the outer wall of the straight guide tube and the inner wall of the circular tower body, with the upper end closed and the lower end open. Dry hot nitrogen gas entering from the hot air inlet 1c first enters the entire circumference of the annular channel and then flows out from the lower end of the annular channel. The lower end of the conical contraction section contracts inwards, guiding the airflow to the center of the tower body. Under the negative pressure suction of the gas phase outlet 1b, the hot nitrogen gas bends and flows upwards, causing the polyester chips to fall onto the central feeding cone 1e and scatter outwards, flowing counter-currently to the hot nitrogen gas and thus being dried. The distributor reduces the channel area, increases the flow rate of hot nitrogen, increases the descent resistance of polyester chips, and prolongs the contact time between polyester chips and hot nitrogen. The distributor also improves the distribution of polyester chips across the cross-section of the tower. Furthermore, the polyester chips bounce back after hitting the central feeding cone 1e, which also reduces the descent speed of the polyester chips and improves the drying efficiency.

[0029] Figure 2 The diagram shows a second type of distributor, suitable for circular towers with a slightly larger inner diameter. Compared to the first type, the straight guide tube is replaced with a bent structure with a central concave section. Specifically, the distributor 1d comprises an upper cone 1d1 and a lower cone 1d2 integrated together. The upper cone 1d1 is wider at the top and narrower at the bottom, while the lower cone 1d2 is narrower at the top and wider at the bottom. The distributor 1d remains located within the inner cavity of the circular tower and the two are coaxial. The central dispensing cone 1e remains on the distributor axis, and the hot air inlet 1c remains connected to the outer wall of the circular tower. An annular channel is still formed between the outer walls of the upper and lower cones 1d1 and the inner wall of the circular tower, with the upper end closed and the lower end open. The part where the upper cone 1d1 and the lower cone 1d2 are connected is the concave part of the distributor. The cross-section of the annular channel is the widest here, and the resistance is the lowest. The axis of the hot air inlet 1c is in the same horizontal plane as the concave part of the distributor. The dry hot nitrogen gas entering from the hot air inlet 1c first enters the widest part in the middle of the annular channel and is rapidly and evenly distributed in the whole circumference. Then it flows downward along the entire annular channel until it flows out from the lower end of the annular channel. The conical contraction section below guides the airflow to the center of the tower and bends upward. The polyester chips fall on the central spreading cone 1e and scatter in all directions, flowing in the opposite direction to the hot nitrogen gas and being dried.

[0030] Figure 3The diagram shows the third type of distributor, suitable for circular towers with larger inner diameters. Compared to the second type, the distributor 1d comprises an integrated upper conical cylinder 1d1, a middle cylindrical cylinder 1d3, and a lower conical cylinder 1d2. The upper conical cylinder 1d1 retains its top-wide, bottom-narrow structure, as does the lower conical cylinder 1d2, which is narrower at the top and wider at the bottom. A middle cylindrical cylinder 1d3 is added between the upper and lower conical cylinders 1d1 and 1d2. The distributor 1d remains located within the inner cavity of the circular tower and the two are coaxial. The central feeding cone 1e is located at the upper part of the distributor's inner cavity. Multiple vents 1d4 are evenly distributed along the entire circumference and height of the middle cylindrical cylinder 1d3. An annular channel is still formed between the outer wall of the distributor and the inner wall of the circular tower. The annular channel is widest at the junction of the outer wall of the middle cylindrical cylinder 1d3 and the inner wall of the circular tower, resulting in minimal resistance. The hot air inlet 1c remains connected to the outer wall of the circular tower and is aligned with the middle cylindrical cylinder 1d3. The hot, dry nitrogen gas entering from the hot air inlet 1c first enters the widest part of the annular channel and rapidly and evenly distributes itself along the entire circumference. A portion of the hot nitrogen gas flows downward along the entire annular channel until it exits from the lower end of the annular channel. The conical contraction section below guides the airflow to the center of the tower and bends upward. Another portion of the hot nitrogen gas passes directly through each vent 1d4 into the central channel, working together to dry the polyester chips that fall from the bottom and splash from the central discharge cone 1e. This further improves the uniformity of air distribution and fabric distribution.

[0031] Figure 4 The diagram shows the fourth type of distributor, suitable for circular towers with larger inner diameters. The outer cylinder is the same as the third type, consisting of an outer upper conical cylinder 1d5, an outer middle cylindrical cylinder 1d6, and an outer lower conical cylinder 1d7, all connected as one unit. The outer upper conical cylinder 1d5 still has a structure that is wider at the top and narrower at the bottom, and the outer lower conical cylinder 1d7 still has a structure that is narrower at the top and wider at the bottom. Multiple outer ventilation holes 1d8 are evenly distributed along the entire circumference and height of the outer middle cylindrical cylinder 1d6.

[0032] An inner cylinder is provided inside the outer cylinder. The inner cylinder includes an inner upper conical cylinder 1d13, an inner middle cylindrical cylinder 1d14, and an inner lower conical cylinder 1d15 that are connected as a whole. The inner upper conical cylinder 1d13 has a structure that is wider at the top and narrower at the bottom, and the inner lower conical cylinder 1d15 has a structure that is narrower at the top and wider at the bottom. Multiple inner vent holes 1d16 are evenly distributed along the entire circumference and height of the inner middle cylindrical cylinder 1d14. A central material spreading cone 1e is provided at the center of the inner middle cylindrical cylinder 1d14.

[0033] A middle layer cylinder is provided between the outer and inner layers. The middle layer cylinder includes an upper conical cylinder 1d9, a middle section cylindrical cylinder 1d10, and a lower conical cylinder 1d11 that are connected as a whole. The upper conical cylinder 1d9 has a structure that is narrow at the top and wide at the bottom, and the top of the upper conical cylinder 1d9 is connected to the top of the upper conical cylinder 1d13 of the inner layer to form a closed structure. The lower conical cylinder 1d11 has a structure that is wide at the top and narrow at the bottom. Multiple vent holes 1d12 are evenly distributed in the entire circumference and height direction of the middle section cylindrical cylinder 1d10.

[0034] The distributor 1d remains located within the inner cavity of the circular tower and the two are coaxial. The upper end of the outer cone 1d5 is connected to the inner wall of the circular tower to form a closed structure. The hot air inlet 1c remains connected to the outer wall of the circular tower, and the inner end of the hot air inlet 1c points towards the upper part of the middle section of the outer cylinder 1d6.

[0035] The outer cylinder and the circular tower body form an outer annular channel, which is closed at the top and open at the bottom, i.e., the first annular channel. The outer cylinder and the middle cylinder form a second annular channel that runs vertically through the tower. The middle cylinder and the inner cylinder form a third annular channel that is closed at the top and open at the bottom. The inner cylinder and the central spreading cone 1e form a fourth annular channel that runs vertically through the tower. In this way, the internal cavity of the large-diameter tower is divided into multiple annular spaces, which improves the uniformity of air distribution.

[0036] Dry hot nitrogen gas entering from the hot air inlet 1c first enters the widest part of the outer annular channel, rapidly and evenly distributing throughout the circumference. The hot nitrogen flows downwards along the outer annular channel until it exits from the lower end. The conical contraction section below guides the airflow to the center of the tower, where it bends and flows upwards into the second, third, and fourth annular channels. Part of the hot nitrogen in the outer annular channel passes through the outer vent 1d8 on the outer middle section cylinder 1d6 into the second annular channel. The hot nitrogen entering the third annular channel enters the second and fourth annular channels through the middle vent 1d12 on the middle section cylinder 1d10 and the inner vent 1d16 on the inner middle section cylinder 1d14. The radial jets from the vents supplement and disturb the axial hot air, further improving the uniformity of the air distribution. The polyester chips fall evenly along the vertically connected second and fourth annular channels, also improving the uniformity of the fabric. The drying medium can be dry hot nitrogen or dry hot air.

[0037] The upper end of the cooling section is equipped with an upper tube sheet, and the lower end is equipped with a lower tube sheet. Both the upper and lower tube sheets have multiple corresponding tube sheet holes. The two ends of the heat exchange tubes are expanded or welded into the corresponding tube sheet holes of the upper and lower tube sheets, respectively. The circular tower at the bottom of the drying section has the smallest diameter and is aligned with the upper tube sheet of the cooling section to ensure that the polyester chips fall within the heat exchange tube arrangement area of ​​the cooling section.

[0038] The lower and upper parts of the cooling section 2 are respectively connected to a cooling medium inlet 2d and a cooling medium outlet 2e. Cooling water or other cooling media enter the shell-side cavity of the cooling section 2 from the cooling medium inlet 2d, indirectly cool the polyester chips in the heat exchange tube 2b, and then flow out from the cooling medium outlet 2e.

[0039] To extend the travel of the cooling medium and prolong the heat exchange time with the polyester chips inside the tube, multiple baffles 2f can be installed on the shell side of the cooling section 2.

[0040] Each tube sheet hole on the upper tube sheet 2a has a flared opening at its upper end. The upper ends of adjacent flared openings are tangent to form a ridge, which allows the dried polyester chips to smoothly enter each flared opening and be introduced into each heat exchange tube 2b, avoiding accumulation and retention on the upper tube sheet 2a. The polyester chips in the heat exchange tube 2b are indirectly cooled by the cooling water outside the tube, i.e., the shell side. Since the polyester chips are dispersed into each heat exchange tube 2b, the material cooling rate of the entire cross section is relatively uniform.

[0041] A collecting cone 3 is connected below the lower tube sheet 2c of the cooling section 2. The upper port flange of the collecting cone 3 is connected below the flange of the lower tube sheet 2c. The cooled polyester chips enter the collecting cone 3 for collection and facilitate smooth discharge from the discharge port 3a at the lower end of the collecting cone 3.

[0042] The above description is merely a preferred embodiment of the present utility model, showing and describing the basic principles, main features, and advantages of the present utility model. It is not intended to limit the scope of patent protection of the present utility model. Those skilled in the art should understand that the present utility model is not limited to the above embodiments. In addition to the above embodiments, the present utility model may have other implementations without departing from the spirit and scope of the present utility model. Various changes and improvements to the present utility model are also possible. All technical solutions formed by equivalent substitutions or equivalent transformations fall within the scope of protection claimed by the present utility model. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents. Technical features not described in the present utility model can be implemented by or using existing technology, and will not be elaborated here.

Claims

1. A dehumidifying and drying tower for polyester chips, characterized in that: From top to bottom, it includes a drying section (1), a cooling section (2), and an aggregate section (3); The drying section (1) is provided with multiple circular towers with progressively smaller diameters from top to bottom. The lower ends of each upper circular tower are connected to the lower circular tower through a tapered contraction section that is wider at the top and narrower at the bottom. The top of the uppermost circular tower is provided with a central feed pipe (1a) and a gas phase outlet (1b). Each circular tower has a hot air inlet (1c) on its side wall. The hot air inlet (1c) is connected to the inner cavity of the tower through a distributor (1d) located inside the tower. The cooling section (2) includes a cylinder, an upper tube sheet (2a) located at the upper end of the cylinder, a lower tube sheet (2c) located at the lower end of the cylinder, and multiple heat exchange tubes (2b) vertically installed between the upper tube sheet (2a) and the lower tube sheet (2c); the cylinder is provided with a cooling medium inlet (2d) and a cooling medium outlet (2e). The collecting section (3) is connected below the cooling section (2), and its bottom is provided with a discharge port (3a).

2. The polyester chip dehumidification and drying tower according to claim 1, characterized in that: The distributor (1d) includes a straight guide tube located inside the inner cavity of the circular tower body. The upper end of the straight guide tube is connected to the upper tower body, and the lower end is open. A central feeding cone (1e) is provided inside the straight guide tube. An annular channel with a closed upper end and an open lower end is formed between the outer wall of the straight guide tube and the inner wall of the circular tower body. The hot air inlet (1c) is connected to the annular channel.

3. The polyester chip dehumidification and drying tower according to claim 1, characterized in that: The distributor (1d) includes an upper cone (1d1) and a lower cone (1d2) located coaxially within the inner cavity of the circular tower. The upper cone (1d1) has a structure that is wider at the top and narrower at the bottom, while the lower cone (1d2) has a structure that is narrower at the top and wider at the bottom. The connection between the two forms the most concave part of the distributor. A central feeding cone (1e) is provided inside the distributor (1d). The outer walls of the upper cone (1d1) and the lower cone (1d2) form an annular channel with a closed upper end and an open lower end between them and the inner wall of the circular tower. The axis of the hot air inlet (1c) is located on the same horizontal plane as the most concave part.

4. The polyester chip dehumidification and drying tower according to claim 1, characterized in that: The distributor (1d) includes an upper conical cylinder (1d1), a middle cylindrical cylinder (1d3), and a lower conical cylinder (1d2) located coaxially within the inner cavity of the circular tower. The upper conical cylinder (1d1) has a structure that is wider at the top and narrower at the bottom, while the lower conical cylinder (1d2) has a structure that is narrower at the top and wider at the bottom. The middle cylindrical cylinder (1d3) connects the two. A central feeding cone (1e) is provided at the upper part of the inner cavity of the distributor (1d). The cylinder wall of the middle cylindrical cylinder (1d3) is provided with multiple ventilation holes (1d4). An annular channel with a closed upper end and an open lower end is formed between the outer wall of the distributor (1d) and the inner wall of the circular tower. The hot air inlet (1c) is aligned with the middle cylindrical cylinder (1d3).

5. The polyester chip dehumidification and drying tower according to claim 1, characterized in that: The distributor (1d) includes an outer cylinder, a middle cylinder, and an inner cylinder coaxially arranged within the inner cavity of the circular tower. The outer cylinder includes an outer upper conical cylinder (1d5), an outer middle cylindrical cylinder (1d6), and an outer lower conical cylinder (1d7) that are connected as a whole. The outer middle cylindrical cylinder (1d6) has an outer vent hole (1d8) on its cylinder wall. The inner cylinder includes an inner upper conical cylinder (1d13), an inner middle cylindrical cylinder (1d14), and an inner lower conical cylinder (1d15) that are connected as a whole. The inner middle cylindrical cylinder (1d14) has an inner vent hole (1d16) on its cylinder wall and a central material spreading cone (1e) at its center. The middle layer cylinder is located between the outer layer cylinder and the inner layer cylinder, and includes an integrally connected upper conical cylinder (1d9), a middle section cylinder (1d10), and a lower conical cylinder (1d11). The middle section cylinder (1d10) has a middle layer vent hole (1d12) on its cylinder wall. The top of the upper conical cylinder (1d9) is connected to the top of the upper conical cylinder (1d13). A first annular channel is formed between the outer cylinder and the inner wall of the circular tower body; a second annular channel is formed between the outer cylinder and the middle cylinder; a third annular channel is formed between the middle cylinder and the inner cylinder; and a fourth annular channel is formed in the inner cavity of the inner cylinder. The hot air inlet (1c) points to the middle section of the outer cylinder (1d6).

6. The polyester chip dehumidification drying tower according to any one of claims 1 to 5, characterized in that: Each tube sheet hole on the upper tube sheet (2a) is provided with a flared opening at its upper end, and the upper ends of adjacent flared openings are tangent to each other.

7. The polyester chip dehumidification drying tower according to any one of claims 1 to 5, characterized in that: The cooling section (2) is equipped with multiple baffles (2f) inside its cylinder.

8. The polyester chip dehumidification drying tower according to any one of claims 1 to 5, characterized in that: The material collection section (3) is a tapered structure that is wider at the top and narrower at the bottom, and its upper port is connected to the lower tube plate (2c).

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