High-efficiency disc type stirring polycondensation kettle

Abstract

The utility model discloses a kind of high-efficiency disc type stirring polycondensation kettle, belong to polyester production equipment technical field.Polycondensation kettle includes the cylinder of circular horizontal type, the bottom of feed end of cylinder is equipped with melt inlet, top of discharge end is equipped with gas phase outlet, the bottom of discharge end is equipped with melt outlet, and heating jacket is equipped in the outer periphery of cylinder;Rotor shaft is eccentrically installed in the inner chamber of cylinder, and the axis of rotor shaft is located just below the axis of cylinder;Low-viscosity zone disc group, medium-viscosity zone disc group and high-viscosity zone disc are sequentially fixed along the axial direction of rotor shaft, and baffle is equipped between melt outlet and adjacent annular disc.The high-efficiency disc type stirring polycondensation kettle is designed by partition, variable structure disc, adapts the characteristics of viscosity change in the whole process of polycondensation reaction, significantly improves mass transfer heat transfer efficiency, improves residence time distribution, can substantially improve devolatilization area, enhance devolatilization efficiency, reduce energy consumption, and reduce operation risk.

Description

Technical Field

[0001] This utility model relates to a polycondensation reactor, and more particularly to a high-efficiency disc-type stirred polycondensation reactor, belonging to the technical field of polyester production equipment. Background Technology

[0002] Polycondensation reactors are commonly used for the devolatilization and polycondensation of polymer melts such as PET, PETG, and PTT to obtain melts with high viscosity, high L-value, and low AA-value. The agitators in the final polycondensation reactor are classified by design as: annular disc type, disc-cage structure, or annular cage type. Their function is to rotate the agitator, causing the melt to form a film on the disc surface. Small molecules and oligomers are easily devolatilized to achieve viscosity increase, and then re-enter the molten pool to renew the melt. The devolatilization efficiency and equipment cycle life of these three structural forms are inversely proportional.

[0003] Traditionally, the demand for higher throughput in polymerization plants has necessitated the design of larger reactors to accommodate more discs and plates to meet process requirements. This leads to several problems: larger reactor volumes mean larger diameter discs and more discs, increasing manufacturing complexity; furthermore, more large-diameter discs result in higher agitation power consumption, further increasing production and operating costs.

[0004] Chinese utility model patent with publication number CN 2671676Y discloses a "continuous polyester squirrel cage agitator". It uses several spokes to connect two large plates to form the main frame. Inside the agitator, several discs are woven from round steel or slats. Connectors are set at both ends to fix the drive shaft and non-drive shaft. It has the advantages of large film-forming area and high efficiency. However, the disadvantages are also obvious. A large number of film fragments are easily carried out by the gas phase, resulting in increased consumption. The overall rigidity is poor, which limits the size of the device. The high viscosity melt is not easy to fall off, which narrows its application range.

[0005] Chinese patent application CN 101460241A discloses a "terminal reactor" that uses a disc-type squirrel cage agitator. Specifically, it uses a cylinder with a diameter of about half as the rotor support, on which discs are welded. Connectors are set at both ends to fix the drive shaft and non-drive shaft. It also has the advantages of large film-forming area and high efficiency. The disadvantages are that the discs lack effective support and are easy to deform, the overall rigidity is poor, which limits the size of the device. A large number of film fragments are easily carried out by the gas phase, resulting in increased consumption. The gas phase channel is narrow and usually requires two gas phase outlets.

[0006] Chinese utility model patent CN 2707362Y discloses a "novel disc reactor" comprising a sealed, horizontally placed cylindrical body with a material inlet and outlet. Inside the cylinder is a drive shaft with multiple sets of annular discs fixed to it. Each annular disc has multiple parallel axially tensioned film steel plates fixed to its side. This novel disc reactor utilizes the annular discs and axially tensioned film steel plates to form vertical and parallel films during use, thereby increasing the amount of liquid film carried within the reactor's internal space, increasing the reactor's mass transfer area, and effectively improving stirring efficiency. However, it has the following shortcomings: 1. The width of the traditional disc rings is designed to be approximately 10% of the reactor's inner diameter, limiting the devolatilization area; 2. The agitation of material in the low-viscosity zone relies solely on a few connecting round steel bars, thus limiting the function of forming a film parallel to the airflow direction within the reactor. Utility Model Content

[0007] 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.

[0008] In view of the problems existing in the above and / or prior art, this utility model is proposed.

[0009] The purpose of this invention is to overcome the problems existing in the prior art and provide a high-efficiency disc-type stirred polycondensation reactor that can significantly increase the devolatilization area, enhance devolatilization efficiency, reduce energy consumption, and reduce operational risks.

[0010] To solve the above technical problems, this utility model provides a high-efficiency disc-type stirred polycondensation reactor, comprising a circular horizontal cylinder. The bottom of the feed end of the cylinder is provided with a melt inlet, the top of the discharge end is provided with a gas phase outlet, and the bottom of the discharge end is provided with a melt outlet. A heating jacket is provided on the outer periphery of the cylinder. A rotor shaft is eccentrically mounted in the inner cavity of the cylinder, and the axis of the rotor shaft is located directly below the axis of the cylinder. A low-viscosity zone disc group, a medium-viscosity zone disc group, and a high-viscosity zone disc are sequentially fixed along the axial direction of the rotor shaft. A baffle is provided between the melt outlet and the adjacent annular disc.

[0011] Furthermore, the low-viscosity zone disc assembly is provided in four to six groups along the rotor shaft axis. Each group of low-viscosity zone disc assemblies includes multiple parallel annular discs, with a gap between the outer edge of each annular disc and the inner wall of the cylinder. The middle annular disc is fixed to the free end of multiple radially distributed spokes, the roots of which are fixed to the rotor shaft. The outer annular discs and the middle annular disc are connected as a whole by multiple connecting crossbars parallel to the rotor shaft. The radial width of the annular discs in the low-viscosity zone disc assembly is 18%-22% of the inner diameter of the cylinder.

[0012] Furthermore, the annular disks of the low-viscosity zone disk assembly are evenly and densely covered with circular holes, and the connecting crossbar is a circular tube, which passes through the circular holes to fix and connect each annular disk.

[0013] Furthermore, some or all of the low-viscosity zone disc assembly are also provided with multiple semi-circular feeding tubes parallel to the rotor shaft. The semi-circular feeding tubes have a semi-circular cross-section and the opening faces upward in the direction of rotation. Each of the semi-circular feeding tubes is evenly distributed on the circumference near the outer edge of the annular disc and is inserted into the corresponding semi-circular groove of the annular disc.

[0014] Furthermore, the intermediate viscous zone disc assembly is provided in multiple groups along the rotor shaft axis. Each intermediate viscous zone disc assembly includes two or three parallel annular discs. Each annular disc is fixed to the free end of multiple radially distributed spokes, and the root of the spokes is fixed to the rotor shaft. The annular discs in the same group are connected as a whole by multiple connecting crossbars parallel to the rotor shaft. The radial width of the annular discs in the intermediate viscous zone disc assembly is 16%-18% of the inner diameter of the cylinder.

[0015] Furthermore, the annular disks of the medium adhesion zone disk assembly are evenly and densely covered with regular hexagonal holes, and the connecting crossbar is a round tube, which passes through the regular hexagonal holes to fix and connect the annular disks.

[0016] Furthermore, the high-viscosity zone discs are single-piece annular disc structures arranged at intervals along the rotor shaft; each annular disc is fixed to the free end of multiple radially distributed spokes, and the roots of the spokes are fixed to the rotor shaft; the annular discs in the high-viscosity zone are uniformly and densely covered with large regular hexagonal holes.

[0017] Furthermore, the radial width of the annular disk in the high viscosity zone is 10%-15% of the inner diameter of the cylinder, wherein the width of the two annular disks closest to the discharge end is 10% of the inner diameter of the cylinder, and they are non-perforated optical disc structures.

[0018] Furthermore, the outer edge of the annular disk in the high viscosity zone is uniformly provided with multiple rotating scrapers. The rotating scrapers extend along the cylinder axis and the blades point towards the inner wall of the cylinder. The rotating scrapers are fixed to the free end of the spokes and have a pushing angle with the rotor shaft axis to push the material towards the discharge end.

[0019] Furthermore, the rotor shaft is a single main shaft, and its discharge end is supported on an inner bearing seat by an inner bearing. The inner bearing seat is installed on an inner support, and the root of the inner support is welded to the inner wall of the discharge end cap.

[0020] Compared with the prior art, the advantages or beneficial effects of this utility model include at least the following: 1. Significantly improved devolatilization efficiency and reduced energy consumption: The width of the annular disc in the low-viscosity zone is 18%-22% of the inner diameter of the cylinder, greatly increasing the devolatilization area of ​​a single disc. Simultaneously, the connecting crossbar and semi-circular feed tube form a large number of additional "parallel films" during stirring, further multiplying the effective film-forming area and forming a composite film-forming mechanism. This significantly increases the specific surface area of ​​the melt, strengthens the mass transfer and devolatilization process, and thus effectively shortens the reaction time or reduces the equipment size while achieving the same or higher output and quality indicators, directly reducing stirring power and heating energy consumption. Combining the stability of disc stirring and the high film-forming area of ​​cage stirring, it is more suitable for the polycondensation production of high-viscosity materials.

[0021] 2. Enhanced Structural Rigidity and Operational Stability: The core structure of the annular disk is directly supported by a single rotor shaft and multiple radial spokes. Multiple annular disks in the same group are rigidly connected as a whole through connecting crossbars, forming a stable spatial truss system. This reduces operational risks and equipment lifespan issues caused by deformation and vibration during large-scale production. Welded joints are also easier to inspect using non-destructive testing, ensuring manufacturing quality.

[0022] 3. Excellent material adaptability, reducing consumption and pollution: Both conventional and high-viscosity varieties can be produced, with differentiated designs for different viscosity zones: In the low-viscosity zone, round holes and semi-circular feed tubes are used to enhance stirring and renewal, prevent wall overheating, and effectively block droplets; in the medium and high-viscosity zones, gradually increasing hexagonal holes are used to ensure devolatilization area and rigidity while facilitating the flow and renewal of high-viscosity melts and promoting the release of small molecules. This significantly reduces raw material degradation and entrainment losses caused by uneven film formation, localized overheating, or film breakage, and lowers the burden on post-processing steps.

[0023] 4. High overall economic benefits and easy to scale up: Higher devolatilization efficiency per unit reaction volume means that for a given production capacity, smaller reactors and smaller drive units can be designed, thus reducing initial equipment investment. Its excellent rigidity and stability facilitate large-scale equipment development. Simultaneously, the reduced energy consumption due to high efficiency and the raw material savings from low consumption together constitute a significant long-term operating cost advantage. Attached Figure Description

[0024] 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 the high-efficiency disc-type stirred polycondensation reactor of this utility model; Figure 2 This is a cross-section of the low-viscosity zone disc assembly of this utility model. Figure 1 ; Figure 3 This is a cross-section of the low-viscosity zone disc assembly of this utility model. Figure 2 ; Figure 4 This is a cross-sectional view of the disc assembly in the middle adhesion zone of this utility model; Figure 5 This is a cross-sectional view of the non-last high-viscosity zone disc in this utility model; Figure 6 This is a cross-sectional view of the high-viscosity zone disc at the very end of this invention; Reference numerals: 1. Shell; 1a. Melt inlet; 1b. Gas phase outlet; 1c. Melt outlet; 2. Rotor shaft; 3. Low-viscosity zone disc assembly; 4. Medium-viscosity zone disc assembly; 5. High-viscosity zone disc; 6. Spokes; 7. Connecting crossbar; 8. Annular disk; 8a. Circular hole; 8b. Small hexagonal hole; 8c. Large hexagonal hole; 9. Semi-circular feed tube; 10. Rotary scraper; 11. Baffle; 12. Inner bearing seat; 13. Inner support. Detailed Implementation

[0025] 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 some embodiments of this utility model, and not all embodiments.

[0026] 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.

[0027] like Figure 1 As shown, the high-efficiency disc-type stirred polycondensation reactor of this utility model includes a circular horizontal cylinder 1. The bottom of the feed end of the cylinder 1 is provided with a melt inlet 1a, the top of the cylinder 1 is provided with a gas phase outlet 1b, and the bottom of the discharge end of the cylinder 1 is provided with a melt outlet 1c. A heating jacket is provided on the outer periphery of the cylinder 1 to heat the melt in the inner cavity of the cylinder 1.

[0028] The inner cavity of the cylinder 1 is axially mounted with a rotor shaft 2. Since the melt is only located in the bottom area of ​​the cylinder 1 and the upper part of the inner cavity of the cylinder 1 is a devolatilization space, there is no assembly requirement with the rotor. Therefore, the rotor shaft 2 is eccentrically set in the inner cavity of the cylinder 1, and the axis of the rotor shaft 2 is located directly below the axis of the cylinder 1.

[0029] Along the axial direction of rotor shaft 2, a low-viscosity zone disc group 3, a medium-viscosity zone disc group 4, and a high-viscosity zone disc group 5 are fixed sequentially. The low-viscosity zone disc group 3 is located near the melt inlet 1a (feed end), and the high-viscosity zone disc group 5 is located near the melt outlet 1c (discharge end). A baffle 11 is provided between the melt outlet 1c and the adjacent annular disc 8 to maintain a certain liquid level of the melt at the bottom of the cylinder 1. The upper edge of the baffle 11 slopes along the melt surface, better matching the actual operating conditions of the equipment.

[0030] like Figure 2 As shown, the low-viscosity zone disk group 3 is provided with four to six groups along the length direction of the rotor shaft 2, i.e., axially. Figure 2 There are six groups in total. Each low-viscosity zone disc group 3 has four or five parallel annular discs 8, with a gap between the outer edge of the annular discs 8 and the inner wall of the cylinder 1. The two or three annular discs 8 in the middle are fixed to the free ends of multiple spokes 6. The spokes 6 are evenly distributed radially, and the root of each spoke 6 is fixed to the rotor shaft 2. Preferably, the low-viscosity zone disc group 3 has six spokes 6.

[0031] The two outer annular disks 8 are connected to the two or three middle annular disks 8 by multiple connecting crossbars 7, which are parallel to the axis of the rotor shaft 2 and evenly distributed on two circumferences near the inner and outer edges of the annular disks 8. The annular disks 8 in the low-viscosity zone disk group 3 are all the same size, and their radial width is 18%-22% of the inner diameter of the cylinder 1.

[0032] The rotor shaft 2 drives each annular disk 8 to rotate via spokes 6. The bottom of the annular disk 8 is immersed in the melt at the bottom of the cylinder 1, and then rotates to the devolatilization space at the upper part of the inner cavity of the cylinder 1. The melt forms a film on both sides of the annular disk 8, which increases the specific surface area of ​​the melt, which is conducive to the overflow of small molecules and their extraction from the gas phase outlet 1b. The melt achieves condensation polymerization, and the molecular weight increases.

[0033] Each annular disc 8 has multiple evenly distributed circular holes 8a, which increases the surface area for volatilization while reducing weight, ensuring material flow, and preventing droplets. Each connecting crossbar 7 is a circular tube that passes through the corresponding circular holes 8a, fixing each annular disc 8 into a single unit.

[0034] Since each annular disk 8 can only rotate within its own plane, its stirring effect on the melt is limited, and the film on both sides is perpendicular to the axis of the rotor shaft 2.

[0035] Since the temperature of the inner wall of the cylinder 1 is the highest, the melt sticking to the inner wall of the cylinder 1 for a long time can easily cause overheating. Each connecting crossbar 7 serves to connect each annular disk 8. When the annular disk 8 rotates, each connecting crossbar 7 rotates in the circumference around the axis of the rotor shaft 2, which plays a good role in stirring and turning the melt at the bottom of the cylinder 1. This prevents the melt adhering to the wall from overheating. At the same time, a film (commonly known as a parallel film) is formed between adjacent connecting crossbars 7 parallel to the axis of the rotor shaft 2, which further increases the film area of ​​the melt and improves the devolatilization effect.

[0036] To further enhance the agitation of the melt at the bottom of the cylinder 1 and increase the area of ​​the parallel film, some or all of the low-viscosity zone disc assembly 3 is equipped with multiple semi-circular scraper tubes 9. Each semi-circular scraper tube 9 has a semi-circular cross-section, with its opening facing upwards in the direction of rotation. Each semi-circular scraper tube 9 is parallel to the rotor shaft 2 axis and evenly distributed on the circumference near the outer edge of the annular disc 8. A semi-circular groove is provided at a corresponding location on each annular disc 8 for the semi-circular scraper tube 9 to be inserted and fixed. When the semi-circular scraper tube 9 rotates to the bottom of the cylinder 1, it agitates the melt while simultaneously scooping up a portion of it. This portion then rotates with the annular disc 8 to the devolatilization space at the upper part of the cylinder 1's inner cavity, where it is poured downwards to form a film, thus maximizing the area of ​​the parallel film.

[0037] like Figure 3 As shown, as the viscosity of the material increases, the two low-viscosity zone disc groups 3 that are farthest from the melt inlet 1a may not be equipped with semi-circular material lifting pipes 9, in order to reduce efficiency consumption and improve stress conditions.

[0038] The intermediate adhesion zone is located in the axial middle of the cylinder 1. Multiple sets of intermediate adhesion zone disc groups 4 are arranged along the length direction of the rotor shaft 2, i.e., axially, usually four sets. Each intermediate adhesion zone disc group 4 is provided with two or three parallel annular discs 8. Similarly, the annular discs 8 are fixed to the free ends of multiple spokes 6. The spokes 6 are evenly distributed radially, and the root of each spoke 6 is fixed to the rotor shaft 2. Preferably, the intermediate adhesion zone disc group 4 has five spokes 6.

[0039] The annular disks 8 in the same group are connected as a whole by multiple connecting crossbars 7. Each connecting crossbar 7 is parallel to the axis of the rotor shaft 2 and is evenly distributed on two circumferences near the inner and outer edges of the annular disks 8. The annular disks 8 in the middle adhesion zone disk group 4 have the same size, and their radial width is 16%-18% of the inner diameter of the cylinder 1.

[0040] like Figure 4 As shown, each annular disk 8 has a plurality of uniformly distributed hexagonal holes 8b, which increases the devolatilization area of ​​the disk while reducing weight, ensuring material flow, and facilitating the devolatilization of oligomers and small molecules. Each connecting crossbar 7 is a circular tube that passes through the corresponding hole 8b, fixing each annular disk 8 into a whole.

[0041] The high-viscosity zone adopts a single-disc structure, with each annular disk 8 fixed to the free end of multiple spokes 6. The spokes 6 are evenly distributed radially, and the root of each spoke 6 is fixed on the rotor shaft 2. Preferably, each annular disk 8 in the high-viscosity zone has five spokes 6.

[0042] like Figure 5 As shown, each annular disk 8 in the high viscosity zone is evenly and densely covered with multiple large hexagonal holes 8c. The side length of the large hexagonal holes 8c is greater than the side length of the small hexagonal holes 8b in the medium viscosity zone. That is, the opening size on the annular disk 8 in the high viscosity zone is larger than that in the medium viscosity zone. While increasing the devolatilization area of ​​the disk, it further reduces the weight, ensures material flow, and facilitates the devolatilization of oligomers and small molecules.

[0043] The radial width of each annular disk 8 in the high-viscosity zone is 10%-15% of the inner diameter of the cylinder 1, where, for example... Figure 6 As shown, the two annular disks 8 closest to the discharge end have a radial width of 10% of the inner diameter of the cylinder 1, and can be designed as non-perforated discs to facilitate the shedding of highly viscous melt. The rest are as follows... Figure 5 As shown, the radial width of each annular disk 8 in the high viscosity zone is 12%-15% of the inner diameter of the cylinder 1.

[0044] like Figure 1 As shown, multiple rotating scrapers 10 are evenly arranged on the outer edge of each annular disk 8 in the high viscosity zone. The rotating scrapers 10 extend axially along the cylinder 1 with their blades pointing towards the inner wall of the cylinder 1. The rotating scrapers 10 are fixed to the free ends of each spoke 6. There is a pushing angle between each rotating scraper 10 and the axis of the rotor shaft 2, which pushes the material towards the discharge end. While updating the material on the bottom wall of the cylinder 1, each rotating scraper 10 also pushes the melt, facilitating the flow of the melt towards the melt outlet 1c.

[0045] The rotor shaft 2 adopts a one-piece main shaft design, which reduces the amount of welding in the agitator and makes the welded joints easy to perform non-destructive testing, fully ensuring the mechanical strength of the agitator and avoiding the rigidity problems and weld damage problems of squirrel cage and disc squirrel cage agitators.

[0046] The feed end of rotor shaft 2 extends from the feed end cover and is supported on the outer frame by a bearing housing, with multiple seals at the feed end cover. The discharge end of rotor shaft 2 is supported on an inner bearing housing 12 by an inner bearing, which is mounted on an inner support 13. The root of the inner support 13 is welded to the inner wall of the discharge end cover, thus reducing leakage points.

[0047] 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 high-efficiency disc-type stirred polycondensation reactor, comprising a circular horizontal cylinder (1), wherein the bottom of the feed end of the cylinder (1) is provided with a melt inlet (1a), the top of the discharge end is provided with a gas phase outlet (1b), and the bottom of the discharge end is provided with a melt outlet (1c), and a heating jacket is provided on the outer periphery of the cylinder (1); characterized in that: The inner cavity of the cylinder (1) is eccentrically mounted with a rotor shaft (2), the axis of the rotor shaft (2) is located directly below the axis of the cylinder (1); along the axial direction of the rotor shaft (2), a low viscosity zone disc group (3), a medium viscosity zone disc group (4) and a high viscosity zone disc (5) are fixed in sequence; a baffle (11) is provided between the melt outlet (1c) and the adjacent annular disc (8); The low-viscosity zone disc group (3) is provided with four to six groups along the rotor shaft (2). Each low-viscosity zone disc group (3) includes multiple parallel annular discs (8). There is a gap between the outer edge of each annular disc (8) and the inner wall of the cylinder (1). The annular disc (8) located in the middle is fixed to the free end of multiple radially distributed spokes (6). The root of the spokes (6) is fixed to the rotor shaft (2). The annular discs (8) located on the outer side and the annular discs (8) located in the middle are connected as a whole by multiple connecting crossbars (7) parallel to the rotor shaft (2). The radial width of the annular discs (8) of the low-viscosity zone disc group (3) is 18%-22% of the inner diameter of the cylinder (1).

2. The high-efficiency disc-type stirred polycondensation reactor according to claim 1, characterized in that: The annular disk (8) of the low-viscosity disk group (3) has evenly distributed circular holes (8a). The connecting crossbar (7) is a circular tube, and the connecting crossbar (7) passes through the circular holes (8a) to fix and connect each annular disk (8).

3. The high-efficiency disc-type stirred polycondensation reactor according to claim 1, characterized in that: Some or all of the low-viscosity zone disc group (3) are also provided with multiple semi-circular feeding tubes (9) parallel to the rotor shaft (2). The semi-circular feeding tubes (9) have a semi-circular cross-section and the opening faces upward in the direction of rotation. Each of the semi-circular feeding tubes (9) is evenly distributed on the circumference near the outer edge of the annular disc (8) and inserted into the corresponding semi-circular groove of the annular disc (8).

4. The high-efficiency disc-type stirred polycondensation reactor according to claim 1, characterized in that: The medium-adhesion zone disc group (4) is provided in multiple groups along the rotor shaft (2). Each medium-adhesion zone disc group (4) includes two or three parallel annular discs (8). Each annular disc (8) is fixed to the free end of multiple radially distributed spokes (6). The root of the spokes (6) is fixed to the rotor shaft (2). The annular discs (8) in the same group are connected as a whole by multiple connecting crossbars (7) parallel to the rotor shaft (2). The radial width of the annular discs (8) in the medium-adhesion zone disc group (4) is 16%-18% of the inner diameter of the cylinder (1).

5. The high-efficiency disc-type stirred polycondensation reactor according to claim 4, characterized in that: The annular disk (8) of the middle adhesive zone disk group (4) is evenly and densely covered with regular hexagonal holes (8b). The connecting crossbar (7) is a round tube, and the connecting crossbar (7) passes through the regular hexagonal holes (8b) to fix and connect each annular disk (8).

6. The high-efficiency disc-type stirred polycondensation reactor according to claim 1, characterized in that: The high-viscosity zone disc (5) is a single-piece annular disc structure arranged at intervals along the rotor shaft (2); each annular disc (8) is fixed to the free end of multiple radially distributed spokes (6), and the root of the spokes (6) is fixed to the rotor shaft (2); the annular disc (8) in the high-viscosity zone is uniformly and densely covered with regular hexagonal large holes (8c).

7. The high-efficiency disc-type stirred polycondensation reactor according to claim 6, characterized in that: The radial width of the annular disk (8) in the high viscosity zone is 10%-15% of the inner diameter of the cylinder (1), wherein the width of the two annular disks (8) closest to the discharge end is 10% of the inner diameter of the cylinder (1), and they are non-perforated optical disc structures.

8. The high-efficiency disc-type stirred polycondensation reactor according to claim 6, characterized in that: Multiple rotating scrapers (10) are evenly provided on the outer edge of the annular disk (8) in the high viscosity zone. The rotating scrapers (10) extend along the axial direction of the cylinder (1) and the blades point towards the inner wall of the cylinder (1). The rotating scrapers (10) are fixed to the free end of the spokes (6) and there is a pushing angle between them and the axis of the rotor shaft (2) to push the material towards the discharge end.

9. The high-efficiency disc-type stirred polycondensation reactor according to claim 1, characterized in that: The rotor shaft (2) is a whole main shaft, and its discharge end is supported on the inner bearing seat (12) by the inner bearing. The inner bearing seat (12) is installed on the inner bracket (13), and the root of the inner bracket (13) is welded to the inner wall of the discharge end cover.

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