A mesophase pitch thermal polycondensation reactor and reaction device

Abstract

The utility model relates to a kind of mesophase pitch heat polycondensation reactor and reaction device, mesophase pitch heat polycondensation reactor includes reactor, heater, power mechanism and stirring mechanism, reactor is vertically arranged and is connected with heater, the top of reactor is equipped with material inlet, the bottom of reactor is fixed with material outlet;Power mechanism is fixed in the top of reactor, and stirring mechanism is located in reactor;Stirring mechanism includes stirring shaft, outer anchor frame and inner stirring part, stirring shaft is coaxially fixed connection with power mechanism output shaft, the central axis of stirring shaft coincides with the central axis of reactor, outer anchor frame is fixed on stirring shaft, inner stirring part is located in outer anchor frame and is connected with stirring shaft, and inner stirring part is arranged around stirring shaft.The utility model uses outer anchor frame+inner stirring part combined type stirring paddle, and inner stirring part can push material to flow along axial direction, realizes material overall circulation, makes material mixing more uniform, and it is favorable to improve the mesophase content of mesophase pitch product.

Description

Technical Field

[0001] This utility model relates to the technical field of mesophase pitch preparation equipment, specifically to a mesophase pitch thermal polycondensation reactor and reaction device. Background Technology

[0002] Mesophase pitch, as a novel carbon material precursor with excellent properties, has broad application prospects in high-performance carbon fibers, carbon material electrodes, and thermally conductive materials. Its preparation process mainly relies on thermal polycondensation reactions, and the performance of the reaction equipment directly affects the quality and production efficiency of mesophase pitch. Therefore, developing efficient and stable mesophase pitch thermal polycondensation reactors is of great significance for promoting the development of the mesophase pitch industry.

[0003] The preparation of mesophase pitch is typically achieved through thermal polycondensation of raw materials such as coal tar pitch and petroleum pitch. During this process, the raw materials are heated to induce a series of chemical reactions, forming mesophase pitch with specific structures and properties. The thermal polycondensation process for producing mesophase pitch usually takes place within a reactor. This process requires ensuring that the liquid mesophase pitch within the reactor remains as homogeneous as possible; therefore, stirring with a stirring paddle is necessary to facilitate reaction, heat transfer, and mass transfer.

[0004] In existing technologies, mesophase pitch thermal polycondensation reactors mostly employ traditional heat transfer oil heating methods. However, these heating methods have many drawbacks. Traditional heating methods heat the material by transferring heat from the outside to the inside. This method leads to uneven heating of the material; the material near the heating source has an excessively high temperature, which easily causes over-reaction and coking; while the material far from the heating source has an insufficient temperature and incomplete reaction, thus reducing the mesophase content of the mesophase pitch product.

[0005] Meanwhile, the existing reactors have poorly designed stirring devices, mostly using a single-structure agitator that cannot achieve sufficient mixing of materials. During the reaction, materials easily adhere to the reactor's inner wall and the agitator, further exacerbating coking. Coking not only affects the reactor's heat transfer efficiency and stirring effect but also requires frequent shutdowns for cleaning, making long-term continuous operation impossible and severely impacting production efficiency and product quality stability.

[0006] During the thermal polycondensation of mesophase pitch, its viscosity increases significantly with the progress of the reaction, and the material is prone to coking and adhering to the vessel walls. Therefore, the design of the agitator is crucial for ensuring the homogeneity of the reaction system, heat and mass transfer efficiency, and preventing coking. Conventional agitators are prone to "slippage" (energy is consumed by viscosity rather than driving mixing). Mesophase pitch tends to accumulate on the vessel walls, forming dead zones and reducing heat and mass transfer efficiency. For every 10-fold increase in viscosity, the agitation power consumption increases approximately 100-fold, necessitating optimization of the agitator design to reduce the energy consumption ratio.

[0007] Furthermore, due to the aforementioned problems with existing technologies, the mesophase content of the prepared mesophase pitch products is typically low, generally below 80%, making it difficult to meet the demand for high-purity mesophase pitch in high-end applications. Therefore, developing a mesophase pitch thermal polycondensation reactor that can solve the problems of easy coking in existing reactors and low mesophase content in mesophase pitch products, enabling long-term continuous operation and achieving a mesophase content of over 95% in the mesophase pitch products, is of significant practical importance.

[0008] Utility model patent CN217699154 ​​U discloses a molten salt reactor, including a molten salt heating tank, a reaction vessel, an insulation layer, and a main heating element. The reaction vessel is disposed within the cavity of the molten salt heating tank, and an asphalt stirring device is installed inside the reaction vessel. A molten salt stirring device is also installed inside the molten salt cavity. A gas distribution pipe is provided at the bottom of the reaction vessel, and an inlet pipe and an outlet pipe are provided at the top of the reaction vessel. The inlet pipe is connected to the gas distribution pipe. The main heating element is disposed on the outer wall of the molten salt heating tank, and the insulation layer completely covers the molten salt heating tank and the main heating element. The main heating element is an electrically heated armored heater. This patent uses a heating element disposed on the inner wall of the insulation layer around the reaction vessel for heating. However, the placement of this heating element and stirring device may still result in coking.

[0009] Utility model patent CN 220246032 U discloses a mesophase pitch preparation device, comprising: a first extractor having a first extractant inlet, a medium-low temperature coal tar pitch inlet, a first residue outlet, and a first separated pitch outlet; a second extractor having a second extractant inlet, a first separated pitch inlet, a second residue outlet, and a second separated pitch outlet, the first separated pitch inlet being connected to the first separated pitch outlet; a heater having a second separated pitch inlet and a modified pitch outlet, the second separated pitch inlet being connected to the second separated pitch outlet, the heater being used to heat and modify the flowing pitch; and a separator having a modified pitch inlet and a mesophase pitch outlet, the modified pitch inlet being connected to the modified pitch outlet, the separator being used to separate mesophase pitch from the modified pitch. The heater is a regenerative reactor, the regenerative reactor comprising: a shell having a heating chamber; a reaction tube disposed in the heating chamber, the second separated pitch inlet and the modified pitch outlet both being disposed in the reaction tube; and a heating unit for heating the reaction tube. This patent uses extraction and separation to prepare mesophase pitch. Utility Model Content

[0010] In order to solve one or more technical problems existing in the prior art, this utility model provides an intermediate phase pitch thermal polycondensation reactor and reaction device.

[0011] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: This utility model provides a mesophase pitch thermal polycondensation reactor, including a reactor, a heater, a power mechanism and a stirring mechanism. The reactor is arranged vertically and connected to the heater. The top of the reactor is provided with a material inlet and the bottom of the reactor is fixedly provided with a material outlet. The power mechanism is fixed to the top of the reactor and the stirring mechanism is located inside the reactor. The stirring mechanism includes a stirring shaft, an outer anchor frame, and an inner stirring part. The stirring shaft is coaxially and fixedly connected to the output shaft of the power mechanism. The central axis of the stirring shaft coincides with the central axis of the reactor. The outer anchor frame is fixed on the stirring shaft. The inner stirring part is located inside the outer anchor frame and connected to the stirring shaft. The inner stirring part is arranged around the stirring shaft.

[0012] The beneficial effects of this utility model are as follows: The mesophase asphalt thermal polycondensation reactor of this utility model adopts a combined stirring paddle with an outer anchor frame and an inner stirring part. The inner stirring part can drive the material to flow axially and realize the overall circulation of the material. The outer anchor frame stirring paddle can scrape off the material adhering to the inner wall of the reactor, prevent the material from coking, and at the same time enhance the radial stirring effect of the material, making the material mix more uniform, improving the uniformity and fullness of the reaction, and helping to increase the mesophase content of the mesophase asphalt product.

[0013] Based on the above technical solution, the present invention can be further improved as follows.

[0014] Furthermore, a horizontally arranged first fixing rod is fixed near the bottom of the outer anchor frame, and the lower end of the inner stirring part is fixed on the first fixing rod. The central axis of the inner stirring part coincides with the central axis of the stirring shaft.

[0015] The beneficial effect of adopting the above-mentioned further solution is that by setting the first fixing rod, the stable installation and connection of the internal threaded belt can be achieved.

[0016] Furthermore, the internal stirring section includes multiple internal spiral ribbons, which are arranged in an alternating and uniform manner. The middle parts of two adjacent internal spiral ribbons are fixedly connected by a second fixing rod, and the upper ends of two adjacent internal spiral ribbons are fixedly connected by a third fixing rod.

[0017] The beneficial effect of adopting the above-mentioned further solution is that by setting an internal spiral belt, the material can be stirred evenly and stably.

[0018] Furthermore, the inner stirring part includes two inner spiral ribbons, which are arranged symmetrically in an alternating manner. The second fixing rod and the third fixing rod are both fixedly connected to the stirring shaft. The two ends of the third fixing rod are respectively fixedly connected to the upper ends of the two inner spiral ribbons or the two ends of the third fixing rod are respectively fixed to the upper end of the outer anchor frame.

[0019] The beneficial effect of adopting the above-mentioned further solution is that setting two internal spiral bands improves the mixing effect.

[0020] Furthermore, the internal stirring section includes internal helical blades, which are fixed on the stirring shaft and arranged helically around the stirring shaft.

[0021] The beneficial effect of adopting the above-mentioned further scheme is that the internal helical blade agitator can drive the material to flow axially, realizing the overall circulation of the material.

[0022] Furthermore, the outer anchor frame includes two vertical rods and two V-shaped connecting rods located on the same plane. The two vertical rods are symmetrically arranged on both sides of the stirring shaft, and the two V-shaped connecting rods are symmetrically connected to the lower ends of the stirring shaft. The lower ends of the vertical rods are fixedly connected to the free ends of the V-shaped connecting rods. A section of the vertical rods and the connected V-shaped connecting rods are respectively adjacent to the inner sidewall and the inner bottom wall of the reactor and are adapted to the cross-sectional shape of the inner sidewall and the inner bottom wall of the reactor. The material outlet is arranged directly opposite the lower end of the stirring shaft. The two V-shaped connecting rods and the inner bottom wall of the reactor form a material outlet chamber, and the material outlet is connected to the material outlet chamber.

[0023] Furthermore, a pressure sensor is also embedded in the top of the reactor.

[0024] Furthermore, the heater includes a plurality of microwave heaters, which are respectively fixed on the outer side wall of the reactor.

[0025] The beneficial effects of adopting the above-mentioned further solution are: using microwaves as a heating method, microwaves can penetrate deep into the material and achieve uniform heating of the material, avoiding the local overheating phenomenon caused by traditional heating methods, thereby reducing coking of the material.

[0026] Furthermore, the heater includes an electric heater, and a material circulation port is provided on the side wall of the reactor. The material outlet is connected to and communicates with the inlet of the electric heater through a first circulation pipeline, and the outlet of the electric heater is connected to and communicates with the material circulation port through a second circulation pipeline. A screw pump is provided on the first circulation pipeline.

[0027] The beneficial effects of adopting the above-mentioned further scheme are: by using the mesophase asphalt external circulation heating method, there is no need to arrange heating facilities on the reactor body, which reduces the manufacturing difficulty and cost of the reactor. The material can be uniformly heated outside the reactor, avoiding the local overheating phenomenon of the material caused by the traditional heating method, thereby reducing the coking of the material.

[0028] This utility model also provides a reaction device, including a mesophase pitch thermal polycondensation reactor as described above, and further including a temperature sensor and a temperature controller. Multiple temperature sensors are embedded in the side wall of the reactor, and the temperature sensors and the heater are electrically connected to the temperature controller.

[0029] The beneficial effects of this utility model are: by setting a temperature sensor and a temperature controller, it is convenient to control the heating power of the heater through the temperature controller, thereby achieving precise control of the material temperature. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the internal structure of the reaction device of this utility model. Figure 1 ; Figure 2 This is a schematic diagram of the principle structure of the reaction device of this utility model. Figure 1 ; Figure 3 This is a schematic diagram of the main structure of the stirring mechanism of the reaction device of this utility model. Figure 1 ; Figure 4 This is a top view of the stirring mechanism of the reaction device of this utility model. Figure 1 ; Figure 5 This is a schematic diagram of the internal structure of the reaction device of this utility model. Figure 2; Figure 6 This is a schematic diagram of the principle structure of the reaction device of this utility model. Figure 2 ; Figure 7 This is a schematic diagram of the main structure of the stirring mechanism of the reaction device of this utility model. Figure 2 ; Figure 8 This is a top view of the stirring mechanism of the reaction device of this utility model. Figure 2 .

[0031] The attached diagram lists the components represented by each number as follows: 1. Reactor; 11. Material inlet; 12. Material outlet; 13. Bottom valve; 14. Pressure sensor; 15. Exhaust pipe; 2. Mixing mechanism; 21. Mixing shaft; 22. Outer anchor frame; 221. Material outlet chamber; 23. Inner spiral ribbon; 24. First fixing rod; 25. Second fixing rod; 26. Third fixing rod; 27. Inner spiral blade; 28. Groove; 3. Power mechanism; 4. Microwave heater; 5. Temperature sensor; 6. Temperature controller; 7. Electric heater; 71. First circulation pipeline; 72. Second circulation pipeline; 73. Screw pump. Detailed Implementation

[0032] The principles and features of this utility model are described below. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0033] Example 1 like Figures 1-8 As shown, an intermediate phase pitch thermal polycondensation reactor of this embodiment includes a reactor 1, a heater, a power mechanism 3, and a stirring mechanism 2. The reactor 1 is arranged vertically and connected to the heater. The top of the reactor 1 is provided with a material inlet 11, and the bottom of the reactor 1 is fixedly provided with a material outlet 12. The power mechanism 3 is fixed to the top of the reactor 1, and the stirring mechanism 2 is located inside the reactor 1. A bottom valve 13 for controlling the on / off state is provided at the material outlet 12.

[0034] The stirring mechanism 2 includes a stirring shaft 21, an outer anchor frame 22, and an inner stirring part. The stirring shaft 21 is coaxially and fixedly connected to the output shaft of the power mechanism 3. The central axis of the stirring shaft 21 coincides with the central axis of the reactor 1. The outer anchor frame 22 is fixed on the stirring shaft 21. The inner stirring part is located inside the outer anchor frame 22 and connected to the stirring shaft 21. The inner stirring part is arranged around the stirring shaft 21.

[0035] like Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, in one specific embodiment, a pressure sensor 14 is also embedded in the top of the reactor 1.

[0036] The mesophase asphalt thermal polycondensation reactor in this embodiment adopts a combined agitator with an outer anchor frame and an inner stirring section. The inner stirring section can drive the material to flow axially, realizing the overall circulation of the material. The outer anchor frame agitator can scrape off the material adhering to the inner wall of the reactor, preventing the material from coking, while enhancing the radial stirring effect of the material, making the material mix more uniform, improving the uniformity and completeness of the reaction, and helping to increase the mesophase content of the mesophase asphalt product.

[0037] Example 2 Based on Example 1, this example provides a preferred structure for the internal stirring section. For example... Figures 1-4 As shown, in this embodiment, a horizontally arranged first fixing rod 24 is fixed near the bottom of the outer anchor frame 22. The lower end of the inner stirring part is fixed to the first fixing rod 24, and the central axis of the inner stirring part coincides with the central axis of the stirring shaft 21. By setting the first fixing rod, stable installation and connection of the inner spiral ribbon can be achieved. An exhaust pipe 15 can also be installed on the first fixing rod for introducing gas into the reactor.

[0038] Preferred, such as Figures 1-4 As shown, the internal stirring section includes multiple internal spiral ribbons 23, which are arranged in a staggered and uniform manner. The middle of two adjacent internal spiral ribbons 23 is fixedly connected by a second fixing rod 25, and the upper ends of two adjacent internal spiral ribbons 23 are fixedly connected by a third fixing rod 26. By setting the internal spiral ribbons, the material can be stirred evenly and stably.

[0039] Furthermore, such as Figure 1 and Figure 3 As shown, the internal stirring section in this embodiment includes two internal spiral ribbons 23, which are arranged symmetrically and alternately. The second fixing rod 25 and the third fixing rod 26 are both fixedly connected to the stirring shaft 21. The two ends of the third fixing rod 26 are respectively fixedly connected to the upper ends of the two internal spiral ribbons 23 (e.g., ...). Figure 3 (as shown) or the two ends of the third fixing rod 26 are respectively fixed to the upper end of the outer anchor frame 22 (as shown). Figure 1 (As shown). The addition of two internal spiral bands makes the structure more stable and improves the mixing effect.

[0040] Example 3 Based on Example 1, this example provides a preferred structure for the internal stirring section. For example... Figures 5-8As shown, in this embodiment, a horizontally arranged first fixing rod 24 is fixed near the bottom of the outer anchor frame 22. The lower end of the inner stirring part is fixed to the first fixing rod 24, and the central axis of the inner stirring part coincides with the central axis of the stirring shaft 21. By setting the first fixing rod, stable installation and connection of the inner threaded section can be achieved.

[0041] Preferred, such as Figures 5-8 As shown, the internal stirring section includes an internal helical blade 27, which is fixed on the stirring shaft 21 and arranged helically around the stirring shaft 21. The internal helical blade stirring paddle can drive the material to flow axially, realizing the overall circulation of the material.

[0042] Example 4 Based on any of the above embodiments, this embodiment provides a preferred structure for the outer anchor frame 22. For example... Figure 1 , Figure 3 , Figure 5 and Figure 7 As shown, the outer anchor frame 22 in this embodiment includes two vertical rods and two V-shaped connecting rods located on the same plane. The two vertical rods are symmetrically arranged on both sides of the stirring shaft 21, and the two V-shaped connecting rods are symmetrically connected to the lower ends of the stirring shaft 21. The lower ends of the vertical rods are fixedly connected to the free ends of the V-shaped connecting rods. A section of the vertical rod and the connected V-shaped connecting rod is adjacent to the inner sidewall and the inner bottom wall of the reactor 1, respectively, and is adapted to the cross-sectional shape of the inner sidewall and the inner bottom wall of the reactor 1. The material outlet is arranged directly opposite the lower end of the stirring shaft 21. The two V-shaped connecting rods and the inner bottom wall of the reactor 1 enclose a material outlet cavity 221, and the material outlet 12 communicates with the material outlet cavity 221. The first fixing rod 24 is located above the V-shaped connecting rod.

[0043] In this embodiment, the V-shaped connecting rod has a slot 28 on one side that is close to the inner bottom wall of the reactor 1 to avoid internal components of the reactor 1.

[0044] Example 5 Based on any of the above embodiments, this embodiment provides a preferred structure for a heater. For example... Figure 1 and Figure 2 As shown, the heater in this embodiment includes multiple microwave heaters 4, which are respectively fixed on the outer wall of the reactor 1. Using microwaves as the heating method allows them to penetrate deep into the material, achieving uniform heating and avoiding localized overheating caused by traditional heating methods, thereby reducing coking.

[0045] Further preferred, such as Figure 1 and Figure 2As shown, the reactor 1 in this embodiment is provided with multiple layers of microwave heaters 4 around its periphery. Each layer of microwave heaters 4 includes multiple microwave heaters 4, and adjacent layers of microwave heaters 4 are staggered. By setting multiple layers of microwave heaters, uniform heating of the entire reactor can be achieved.

[0046] Example 6 Based on embodiments 1 to 4 above, this embodiment provides a preferred structure for a heater. For example... Figure 5 and Figure 6 As shown, the heater in this embodiment includes an electric heater 7. A material circulation port is provided on the side wall of the reactor 1. The material outlet 12 is connected to and communicates with the inlet of the electric heater 7 through a first circulation pipe 71. The outlet of the electric heater 7 is connected to and communicates with the material circulation port through a second circulation pipe 72. A screw pump 73 is provided on the first circulation pipe 71. By adopting an external circulation heating method for mesophase asphalt, heating facilities do not need to be arranged on the reactor body, reducing the manufacturing difficulty and cost of the reactor. The material can be uniformly heated outside the reactor, avoiding the local overheating phenomenon caused by traditional heating methods, thereby reducing coking of the material.

[0047] Example 7 This embodiment provides a reaction apparatus, including a mesophase pitch thermal polycondensation reactor as described above, and further including a temperature sensor 5 and a temperature controller 6, as shown below. Figure 2 and Figure 6 As shown, multiple temperature sensors 5 are embedded in the sidewall of the reactor 1, and both the temperature sensors 5 and the heater are electrically connected to the temperature controller 6. In this embodiment, multiple temperature sensors 5 can be used to monitor the temperature of the reactor sidewall, and the temperature controller 6 can be used for closed-loop control. The entire control process can be implemented using existing control methods. Figure 2 and Figure 6 In this context, TIC stands for temperature controller 6, and TT stands for temperature sensor 5. Figure 2 MPG in the text refers to microwave heater 4.

[0048] This embodiment uses a temperature sensor and a temperature controller to facilitate the control of the heater's heating power, thereby achieving precise control of the material temperature.

[0049] In the description of this utility model, it should be understood that the terms "center", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0050] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0051] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0052] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0053] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0054] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A mesophase pitch thermal polycondensation reactor, characterized in that, The reactor includes a reactor, a heater, a power unit, and a stirring unit. The reactor is vertically arranged and connected to the heater. The top of the reactor has a material inlet, and the bottom of the reactor has a fixed material outlet. The power unit is fixed to the top of the reactor, and the stirring unit is located inside the reactor. The stirring mechanism includes a stirring shaft, an outer anchor frame, and an inner stirring part. The stirring shaft is coaxially and fixedly connected to the output shaft of the power mechanism. The central axis of the stirring shaft coincides with the central axis of the reactor. The outer anchor frame is fixed on the stirring shaft. The inner stirring part is located inside the outer anchor frame and connected to the stirring shaft. The inner stirring part is arranged around the stirring shaft.

2. The mesophase pitch thermal polycondensation reactor according to claim 1, characterized in that, A horizontally arranged first fixing rod is fixed near the bottom of the outer anchor frame, and the lower end of the inner stirring part is fixed on the first fixing rod. The central axis of the inner stirring part coincides with the central axis of the stirring shaft.

3. The mesophase pitch thermal polycondensation reactor according to claim 2, characterized in that, The internal stirring section includes multiple internal spiral ribbons, which are arranged in an alternating and uniform manner. The middle of two adjacent internal spiral ribbons is fixedly connected by a second fixing rod, and the upper ends of two adjacent internal spiral ribbons are fixedly connected by a third fixing rod.

4. The mesophase pitch thermal polycondensation reactor according to claim 3, characterized in that, The internal stirring part includes two internal spiral ribbons, which are arranged symmetrically and alternately. The second fixing rod and the third fixing rod are both fixedly connected to the stirring shaft. The two ends of the third fixing rod are respectively fixedly connected to the upper ends of the two internal spiral ribbons or the two ends of the third fixing rod are respectively fixed to the upper end of the outer anchor frame.

5. The mesophase pitch thermal polycondensation reactor according to claim 2, characterized in that, The internal stirring section includes internal spiral blades, which are fixed on the stirring shaft and arranged spirally around the stirring shaft.

6. A mesophase pitch thermal polycondensation reactor according to any one of claims 1 to 5, characterized in that, The outer anchor frame includes two vertical rods and two V-shaped connecting rods located on the same plane. The two vertical rods are symmetrically arranged on both sides of the stirring shaft, and the two V-shaped connecting rods are symmetrically connected to the lower ends of the stirring shaft. The lower ends of the vertical rods are fixedly connected to the free ends of the V-shaped connecting rods. A section of the vertical rods and the connected V-shaped connecting rods are respectively adjacent to the inner sidewall and the inner bottom wall of the reactor and are adapted to the cross-sectional shape of the inner sidewall and the inner bottom wall of the reactor. The material outlet is arranged directly opposite the lower end of the stirring shaft. The two V-shaped connecting rods and the inner bottom wall of the reactor form a material outlet chamber, and the material outlet is connected to the material outlet chamber.

7. A mesophase pitch thermal polycondensation reactor according to any one of claims 1 to 5, characterized in that, A pressure sensor is also embedded in the top of the reactor.

8. A mesophase pitch thermal polycondensation reactor according to any one of claims 1 to 5, characterized in that, The heater includes multiple microwave heaters, which are respectively fixed on the outer wall of the reactor.

9. A mesophase pitch thermal polycondensation reactor according to any one of claims 1 to 5, characterized in that, The heater includes an electric heater. A material circulation port is provided on the side wall of the reactor. The material outlet is connected to the inlet of the electric heater through a first circulation pipeline. The outlet of the electric heater is connected to the material circulation port through a second circulation pipeline. A screw pump is provided on the first circulation pipeline.

10. A reaction apparatus, characterized in that, The reactor includes a mesophase pitch thermal polycondensation reactor as described in any one of claims 1 to 9, and further includes a temperature sensor and a temperature controller. A plurality of temperature sensors are embedded in the sidewall of the reactor, and the temperature sensors and the heater are electrically connected to the temperature controller.

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