Chemical reaction kettle with closed feeding structure

Abstract

The invention discloses a chemical reaction kettle with a closed feeding structure, and relates to the technical field of chemical reaction kettles.The chemical reaction kettle comprises a tank body and a tank cover which are connected through a flange, and a driving motor, a driving center stirring shaft and stirring blades are arranged at the top of the tank cover; a jacket is arranged outside the tank body, steam is introduced into the bottom, steam is discharged from the top, an inclined folded plate is arranged in the jacket to form a baffling channel, and a steam path is prolonged to improve heat transfer efficiency; an auxiliary frame is arranged on the outer side of the stirring shaft and comprises a bent plate attached to the inner wall of the tank body, a supporting plate and a connecting plate, a micro-channel pipe network filled with a low-boiling-point working medium is integrated in the stirring shaft, the surface is coated with a silicon carbide coating, and the heat conduction performance is enhanced. Heat-conducting fins are arranged on the outer sides of the auxiliary frames to further promote heat transfer; by optimizing the jacket baffling structure and the heat conduction design of the auxiliary frame, the problem of non-uniform heat transfer of the traditional reaction kettle is solved.

Description

Technical Field

[0001] The invention relates to the technical field of chemical reactors, in particular to a chemical reactor with a closed feeding structure. Background Art

[0002] In the field of chemical production, temperature uniformity in reactors is a key factor affecting reaction efficiency, product consistency, and safety. In existing technologies, closed chemical reactors heated by steam typically use a stirring shaft to drive stirring blades to achieve material mixing.

[0003] However, this type of structure has significant defects: the temperature of the inner wall of the reactor is significantly higher than that of the central area due to direct contact with the heat source, and heat transfer relies only on passive heat conduction between materials, resulting in significant axial and radial temperature gradients. Local high temperature may accelerate side reactions and cause a decrease in product purity; the low temperature in the center causes the reaction rate to lag and prolongs the production cycle. For this reason, we propose a chemical reactor with a closed feeding structure. Summary of the Invention

[0004] The purpose of the present invention is to provide a chemical reactor with a closed feeding structure, which has the advantage of solving the problem of uneven temperature distribution in the reactor through active heat transfer structure and baffle design, improving reaction uniformity and reducing energy consumption.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a chemical reactor with a closed feeding structure, comprising: a tank body and a tank cover sealed and connected by a flange, a drive motor fixed on the top of the tank cover, a stirring shaft rotatably provided at the center of the tank body, the top end of the stirring shaft is drive-connected to the drive motor, and a stirring blade is fixed on the outside of the stirring shaft; a jacket, sealed and fixed to the outside of the tank body, a steam inlet pipe and a steam outlet pipe fixed on the outside of the jacket, the steam inlet pipe is located at the bottom of the jacket, and the steam outlet pipe is located at the top of the jacket; a plurality of auxiliary frames, evenly arranged on the outside of the stirring shaft, for transferring heat from the inner wall of the tank body to the center of the tank body; an auxiliary component, arranged in the jacket, for extending the flow path of the steam in the jacket to improve the heat transfer efficiency.

[0006] Preferably, the auxiliary frame includes a bent plate, a support plate and a connecting plate. The outer side of the bent plate is adapted to and fits the curvature of the inner wall of the tank body. The support plate is fixed to the inner side of the bent plate to enhance the structural strength. There are two connecting plates. One end of the two connecting plates is fixed to the outside of the stirring shaft, and the other end is connected to the bent plate and the support plate respectively.

[0007] Preferably, a closed microchannel network is provided inside the bent plate, the support plate and the connecting plate, and the microchannel network is filled with a low-boiling-point working medium.

[0008] Preferably, the surface of the bent plate in contact with the inner wall of the tank is coated with a silicon carbide ceramic coating.

[0009] Preferably, the auxiliary component includes a plurality of folding plates, which are arranged obliquely in the jacket to form a deflection channel between adjacent folding plates, and the opening of the folding plate at the bottom is arranged below the side of the adjacent upper folding plate away from the opening to guide the steam to flow along the deflection channel.

[0010] Preferably, a guide plate is provided at the opening of the folding plate, the guide plate is fixed to the folding plate, and both sides of the guide plate are inclined surfaces for guiding the condensed water to the discharge outlet at the connection between the opening of the folding plate and the inner wall of the jacket.

[0011] Preferably, heat-conducting fins are fixedly provided on the outside of the auxiliary frame, and the heat-conducting fins extend radially along the stirring shaft.

[0012] Preferably, two groups of stirring blades are provided and distributed axially along the stirring shaft.

[0013] Preferably, a condensate pipe is fixedly provided at the bottom of the jacket for discharging steam condensate.

[0014] Preferably, the outlet of the steam inlet pipe is located below the high side of the bottom fold plate, so as to force the steam to fill the area below the fold plate before entering the upper baffle channel.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The present invention uses the microchannel pipe network and heat-conducting fin design of the auxiliary frame, combined with the phase change heat transfer of the low-boiling-point working fluid, to actively and quickly transfer heat from the high-temperature area of ​​the inner wall of the tank to the low-temperature area in the center, thereby reducing the axial and radial temperature gradients, effectively avoiding local overheating or reaction lag, ensuring uniform heating of the reactants, and improving the purity and consistency of the products.

[0017] 2. The present invention uses the deflection channel formed by the multiple layers of inclined folded plates in the auxiliary components, combined with the directional layout of the steam inlet pipe, to force the steam to form turbulence in the jacket and extend the residence time, thereby fully releasing the latent heat. The steam condensate is discharged in an orderly manner through the guide plate and the discharge port, thereby improving the heat transfer efficiency, reducing steam consumption, and lowering energy costs.

[0018] 3. The present invention coats the surface of the bent plate with a silicon carbide ceramic coating, which has both high thermal conductivity and corrosion resistance, and can withstand high temperature, high pressure and chemical corrosion for a long time, reducing the risk of scaling on the inner wall; the coordinated design of the auxiliary frame and the stirring blade avoids sudden changes in material viscosity caused by uneven temperature, reduces mechanical stress, extends the service life of the equipment, and at the same time reduces the risk of explosion caused by local overheating. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 It is a schematic diagram of the overall structure of the present invention from another perspective;

[0021] Figure 3 This is a schematic diagram of the internal structure of the tank body and jacket of the present invention;

[0022] Figure 4 It is a schematic cross-sectional view of the overall structure of the present invention;

[0023] Figure 5 This is a schematic diagram of the auxiliary frame structure of the present invention;

[0024] Figure 6 This is a schematic cross-sectional view of the internal structure of the auxiliary frame of the present invention;

[0025] Figure 7 This is a schematic diagram of the distribution of support plates inside the jacket of the present invention;

[0026] Figure 8 This is a schematic structural diagram of the guide plate portion of the present invention;

[0027] Figure 9 Schematic diagram of the silicon carbide ceramic coating on the outside of the bent plate of the present invention.

[0028] In the figure: 1. Tank body; 2. Tank cover; 3. Drive motor; 4. Stirring shaft; 5. Stirring blade; 6. Jacket; 7. Steam inlet pipe; 8. Steam outlet pipe; 9. Auxiliary frame; 10. Auxiliary component; 11. Bend plate; 12. Support plate; 13. Connecting plate; 14. Microchannel pipe network; 15. Silicon carbide ceramic coating; 16. Folding plate; 17. Opening; 18. Guide plate; 19. Inclined surface; 20. Discharge outlet; 21. Heat transfer fin; 22. Condensate pipe. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] Example 1: Please refer to Figure 1 - Figure 9, a chemical reactor with a closed feeding structure shown in the figure includes: a tank body 1 and a tank cover 2 connected by a flange seal, the tank body 1 and the tank cover 2 are sealed by the flange to ensure the full sealing of the reaction process and avoid material leakage or external contamination; a driving motor 3 is fixed on the top of the tank cover 2, and a stirring shaft 4 is provided for rotation at the center of the tank body 1. The top of the stirring shaft 4 is connected to the driving motor 3 for driving, and efficient power transmission is achieved by directly driving the stirring shaft 4 to reduce energy loss; a stirring blade 5 is fixed on the outside of the stirring shaft 4, which can enhance the uniformity of material mixing and improve the reaction efficiency; a jacket 6 is sealed and fixed to the outside of the tank body 1, and a steam inlet pipe 7 and a steam outlet pipe 8 are fixed on the outside of the jacket 6, the steam inlet pipe 7 is located at the bottom of the jacket 6, and the steam outlet pipe 8 is located at the top of the jacket 6, high-temperature steam is input through the steam inlet pipe 7 at the bottom, and low-temperature steam is discharged through the steam outlet pipe 8 at the top, forming a stable thermal cycle;

[0031] Multiple auxiliary racks 9 are evenly arranged on the outside of the stirring shaft 4, and are used to transfer the heat from the inner wall of the tank body 1 to the center of the tank body 1; the auxiliary components 10 are arranged in the jacket 6, and are used to extend the flow path of the steam in the jacket 6 to improve the heat transfer efficiency; the auxiliary components 10 arranged in the jacket 6, such as the folding plate 16, extend the steam flow path and enhance the heat exchange; the auxiliary racks 9 are evenly distributed on the outside of the stirring shaft 4, and transfer the heat to the reaction center by contacting the inner wall of the tank body 1, thereby solving the problem of large temperature difference between the edge and the center of the traditional reactor and ensuring the uniformity of the reaction temperature.

[0032] The auxiliary frame 9 includes a bent plate 11, a support plate 12, and a connecting plate 13. The outer side of the bent plate 11 is adapted and fitted with the curvature of the inner wall of the tank body 1, maximizing the contact area to improve the heat transfer efficiency; the support plate 12 is fixed to the inner side of the bent plate 11 to enhance the structural strength. The triangular support structure enhances the overall mechanical strength and avoids vibration deformation during the stirring process; there are two connecting plates 13, one end of each connecting plate 13 is fixed to the outside of the stirring shaft 4, and the other end is connected to the bent plate 11 and the support plate 12 respectively, forming a dynamic heat transfer link, so that the heat is synchronously diffused to the center of the tank body 1 with the stirring action, further optimizing the temperature field distribution;

[0033] The curved plate 11, support plate 12, and connecting plate 13 are internally provided with a closed microchannel network 14. This network is filled with a low-boiling-point working fluid (such as acetone or liquid ammonia). When heated, the working fluid rapidly vaporizes and absorbs heat, efficiently absorbing heat from the inner wall of the tank 1 through a phase change process. The steam flows through the microchannels to a low-temperature region, where it condenses and releases heat, forming a self-circulating heat transfer system. This design significantly improves heat transfer rates while reducing reliance on mechanical agitation and lowering energy consumption.

[0034] Furthermore, the surface of the bent plate 11 in contact with the inner wall of the tank 1 is coated with a silicon carbide ceramic coating 15. Leveraging its high thermal conductivity, high-temperature resistance, and chemical corrosion resistance, it ensures stable heat transfer even in long-term high-temperature and high-pressure environments. The coating also reduces material adhesion, prevents the accumulation of coking or reaction residues, and extends the equipment's cleaning cycle.

[0035] The principle of active heat transfer in the auxiliary frame 9 is as follows: the agitator shaft 4 is driven by the drive motor 3 on top of the tank lid 2, which rotates the agitator blades 5 to achieve basic mixing of the materials. The auxiliary frame 9 is fixed to the outside of the agitator shaft 4 via a connecting plate 13 and rotates synchronously with it. The outer surface of the curved plate 11 of the auxiliary frame 9 conforms to the curvature of the inner wall of the tank body 1. The silicon carbide ceramic coating 15 on the surface, thanks to its high thermal conductivity, quickly transfers heat absorbed by the inner wall of the tank body 1 to the microchannel network 14 within the curved plate 11. Low-boiling-point fluids such as Freon or liquid ammonia filled in the network rapidly vaporize upon contact with the high-temperature area, absorbing a large amount of heat during the phase change process. The gaseous fluid flows through the microchannels to the center of the tank body 1, where it reliquefies upon encountering the cooler materials and releases latent heat, thus forming a continuous heat "pumping" cycle. The structural design of the support plate 12 and connecting plate 13 not only enhances the mechanical strength of the auxiliary frame 9, but also integrates microchannel branches within it, further expanding the heat transfer area. In addition, the radial heat-conducting fins 21 welded on the outside of the auxiliary frame 9 stir the material as the stirring shaft 4 rotates, accelerating the diffusion of heat from the fin surface to the main body of the material, while strengthening the fluid shear force to prevent the material from adhering and coking in the high-temperature area.

[0036] The auxiliary assembly 10 includes a plurality of folded plates 16, which are arranged obliquely within the jacket 6. Baffles are formed between adjacent folded plates 16. After steam enters the jacket 6 from the bottom, it is forced to rise along the baffles, extending its residence time and increasing its contact area with the outer wall of the tank body 1. Furthermore, an opening 17 of the bottom folded plate 16 is located below the side of the adjacent upper folded plate 16 away from the opening 17, thereby guiding the steam to flow along the baffles and forcing the steam to diffuse layer by layer within the jacket 6, ensuring that the steam fully releases its latent heat and improving heat transfer efficiency.

[0037] Among them, a guide plate 18 is provided at the opening 17 of the folded plate 16. The guide plate 18 is fixed to the folded plate 16. The guide plate 18 has inclined surfaces 19 on both sides, which are used to guide the condensed water to the discharge port 20 at the connection between the opening 17 of the folded plate 16 and the inner wall of the jacket 6, effectively avoiding the accumulation of condensed water in the baffle channel to form thermal resistance, and at the same time preventing water droplets from being carried by steam to the high-temperature area to cause local cooling, thereby ensuring stable and efficient steam heat transfer process;

[0038] Furthermore, heat-conducting fins 21 are fixed to the outside of the auxiliary frame 9 and extend radially along the stirring shaft 4, further expanding the heat transfer surface area. As the fins rotate with the stirring shaft 4, they disturb the material and enhance convective heat transfer. The high thermal conductivity of the metal material quickly transfers heat from the edge of the tank 1 to the stirring area, reducing the temperature gradient within the reaction system.

[0039] At the same time, a condensate pipe 22 is fixedly provided at the bottom of the jacket 6 for discharging steam condensate. The inclined folding plate 16 can be used to allow the steam condensate above the jacket 6 to slide to the bottom of the jacket 6, ensuring that the condensate is quickly discharged by gravity. A solenoid valve can be provided at the condensate pipe 22 to prevent excessive accumulation of condensate at the bottom of the jacket 6 while ensuring the steam pressure inside the jacket 6.

[0040] It is worth noting that the outlet of the steam inlet pipe 7 is located below the upper side of the lowest folding plate 16, forcing the steam to fill the area below the folding plate 16 before entering the upper baffle channel. This design prevents steam from directly impacting the upper structure, ensuring uniform steam distribution within the jacket 6, while fully utilizing the steam's latent heat and reducing energy waste.

[0041] The auxiliary component 10 enables the principle of linked heat transfer between the tank body 1 and the jacket 6: the jacket 6 wrapped around the outside of the tank body 1 is injected with high-temperature steam from the bottom through the steam inlet pipe 7, and the steam is guided by the deflection channel of the auxiliary component 10 in the jacket 6, forming a spiral upward turbulent path. The folding plates 16 adopt a multi-layer inclined layout, and the openings 17 between adjacent folding plates 16 are staggered in direction, forcing the steam to flow along a zigzag path in the jacket 6. The opening 17 of the folding plate 16 at the bottom layer is arranged below the side of the upper folding plate 16 away from the opening 17. Combined with the design that the outlet of the steam inlet pipe 7 is located below the high side of the bottom folding plate 16, it is ensured that the steam first fills the bottom area of ​​the jacket 6 and then diffuses layer by layer to the upper deflection channel. This design significantly prolongs the residence time of the steam in the jacket 6, allowing its latent heat to be fully released to the outer wall of the tank body 1. At the same time, a guide plate 18, added to opening 17 of folded plate 16, directs condensed water toward drain outlet 20 via inclined surfaces 19 on either side, preventing condensate accumulation and thermal resistance, thereby maintaining efficient heat exchange between the inner wall of jacket 6 and the steam. A condensate pipe 22 at the bottom of jacket 6 further ensures timely discharge of condensed water, preventing liquid pressure from affecting steam flow stability.

[0042] The present invention weakens the temperature gradient between the inner wall and the central area of ​​the tank body 1 to a greater extent through the two-way heat transfer between the auxiliary frame 9 and the jacket 6. Specifically, the uniform heat release of the steam in the jacket 6 makes the temperature of the outer wall of the tank body 1 tend to be consistent, and the active heat transfer mechanism of the auxiliary frame 9 quickly transfers the edge heat to the center, avoiding the axial and radial temperature differences caused by the lag of heat conduction in traditional reactors. The corrosion resistance of the silicon carbide ceramic coating 15 can resist the erosion of strong acids, strong alkalis or organic solvents, reduce the microscopic defects of the inner wall caused by chemical corrosion, and thus reduce the risk of local hot spots. The coordinated rotation design of the auxiliary frame 9 and the stirring blade 5 further optimizes the fluidity of the material. The high-viscosity material is evenly dispersed under the shearing action of the stirring blade 5, avoiding viscosity fluctuations caused by temperature changes, thereby reducing the mechanical load of the stirring shaft 4 and the motor and extending the service life of the equipment.

[0043] In this technical solution, the optimal configuration of the inclination angle and spacing of the folded plates 16 can be adjusted based on specific process requirements: for exothermic reactions, the spacing can be reduced to enhance turbulence; for endothermic reactions, the spacing can be increased to extend steam residence time. The coordinated operation of the steam outlet pipe 8 at the top of the jacket 6 and the condensate pipe 22 at the bottom ensures stable steam system pressure and flow, preventing a decrease in heat transfer efficiency due to pressure fluctuations.

[0044] In this technical solution, the entire device is equipped with a closed feeding structure, including multiple sets of feeding pipes for feeding solid materials, liquid materials or powder materials, and is equipped with a pressure gauge and a thermometer to monitor the reaction pressure and reaction temperature in real time. The discharge pipe arranged at the bottom of the tank body 1 is used to discharge the product after the mixed reaction.

[0045] The implementation steps of this technical solution are as follows:

[0046] S1. Input high-temperature steam through the steam inlet pipe 7 at the bottom of the jacket 6. The steam first enters the bottom layer of the jacket 6, and is guided by the folding plate 16 of the auxiliary component 10, spirally rising along the zigzag baffle channel. The design of the inclination angle of the folding plate 16 and the staggered openings 17 forces the steam to diffuse layer by layer, prolonging the residence time and fully releasing the latent heat to the outer wall of the tank body 1; the liquid water generated by the condensation of steam in the jacket 6 flows along the inner wall of the jacket 6 and the surface of the folding plate 16, and then is collected to the discharge port 20 through the inclined surface 19 of the guide plate 18 at the opening 17 of the folding plate 16, and finally falls into the bottom area of ​​the jacket 6 and is discharged through the condensate pipe 22 at the bottom of the jacket 6. The solenoid valve equipped on the condensate pipe 22 controls the frequency of condensate discharge to prevent liquid accumulation from affecting the stability of steam flow;

[0047] S2. Materials are added in a sealed state through multiple dedicated feed tubes for solids, liquids, or powders at the top of the tank body 1. The flanged connection between the tank body 1 and the tank lid 2 ensures no leaks, while a pressure gauge and thermometer monitor the internal environment in real time. A drive motor 3 rotates the stirring shaft 4, and the stirring blades 5 shear and mix the materials. Simultaneously, the auxiliary frame 9 rotates synchronously with the stirring shaft 4. The curved plate 11 of the auxiliary frame 9 fits against the inner wall of the tank body 1, and the silicon carbide ceramic coating 15 quickly absorbs the heat from the inner wall and transfers it to the internal microchannel network 14.

[0048] During S3, the low-boiling-point working fluid in the microchannel network 14 is heated and vaporized, absorbing heat from the edge of the tank body 1 and then flowing toward the center of the tank body 1. In the low-temperature region, the working fluid condenses and releases heat, forming a self-circulating heat transfer link. The microchannel branches inside the support plate 12 and the connecting plate 13 further expand the heat transfer area; at the same time, the steam in the jacket 6 continuously heats the outer wall of the tank body 1, and the baffle channel design ensures uniform steam distribution. Heat is conducted to the interior through the wall of the tank body 1, and synergistically acts with the active heat transfer of the auxiliary frame 9 to eliminate the temperature difference between the edge and the center.

[0049] During the reaction, the reaction temperature is maintained by adjusting the steam flow rate and pressure to control the valve of the steam inlet pipe 7. The heat conducting fins 21 on the outside of the auxiliary frame 9 rotate with the stirring to disturb the material, enhance convective heat transfer, and reduce the temperature gradient.

[0050] S5. After the reaction is completed, the steam inlet pipe 7 is closed, and the residual steam in the jacket 6 is discharged through the top steam outlet pipe 8. The condensed water is completely emptied, and the product is discharged through the discharge pipe at the bottom of the tank body 1. The stirring shaft 4 continues to rotate at a low speed to prevent material sedimentation and ensure complete discharge;

[0051] S6. Use high-pressure cleaning equipment to remove residues. The low adhesion characteristics of the silicon carbide coating can simplify the cleaning process. Check whether the auxiliary frame 9, the folding plate 16 and the microchannel pipe network 14 are blocked or corroded to ensure efficient operation in the next cycle.

[0052] Example 2: This embodiment further illustrates Example 1. Figure 3 As shown, the difference lies in the optimization of the stirring blade 5 outside the stirring shaft 4;

[0053] Specifically, two sets of stirring blades 5 are arranged axially along the stirring shaft 4. The upper set of stirring blades 5 primarily breaks up material agglomerates, while the lower set of stirring blades 5 enhances material circulation at the bottom. This dual set design creates a three-dimensional mixing flow field, preventing material stratification or sedimentation, making it particularly suitable for high-viscosity or solid-liquid mixing reaction systems.

[0054] Example 3: This embodiment further illustrates Example 1. Figure 3 and Figure 4 As shown, the difference lies in the optimization of the jacket 6;

[0055] Specifically, the bottom of the jacket 6 is configured to be conical, and the interface of the condensate pipe 22 is located at the lowest point of the conical jacket 6 , so that the steam condensate can be collected into the condensate pipe 22 .

[0056] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0057] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A chemical reactor with a closed feeding structure, characterized in that: include: A tank body (1) and a tank cover (2) are sealed and connected by a flange, a driving motor (3) is fixedly provided on the top of the tank cover (2), a stirring shaft (4) is rotatably provided at the center of the tank body (1), the top end of the stirring shaft (4) is drivingly connected to the driving motor (3), and a stirring blade (5) is fixedly provided on the outside of the stirring shaft (4); A jacket (6) is sealed and fixed to the outside of the tank body (1); a steam inlet pipe (7) and a steam outlet pipe (8) are fixedly provided on the outside of the jacket (6); the steam inlet pipe (7) is located at the bottom of the jacket (6), and the steam outlet pipe (8) is located at the top of the jacket (6); A plurality of auxiliary racks (9) are evenly arranged outside the stirring shaft (4) and are used to transfer heat from the inner wall of the tank body (1) to the center of the tank body (1); An auxiliary component (10) is provided in the jacket (6) and is used to extend the flow path of steam in the jacket (6) to improve heat transfer efficiency.

2. A chemical reactor with a closed feeding structure according to claim 1, characterized in that: The auxiliary frame (9) comprises a bent plate (11), a support plate (12) and a connecting plate (13); the outer side of the bent plate (11) is adapted to and fits the curvature of the inner wall of the tank body (1); the support plate (12) is fixed to the inner side of the bent plate (11) to enhance the structural strength; two connecting plates (13) are provided, one end of each of the two connecting plates (13) is fixed to the outer side of the stirring shaft (4), and the other end is connected to the bent plate (11) and the support plate (12) respectively.

3. The chemical reactor with a closed feeding structure according to claim 2, characterized in that: A closed microchannel network (14) is provided inside the bent plate (11), the support plate (12) and the connecting plate (13), and the microchannel network (14) is filled with a low-boiling-point working medium.

4. The chemical reactor with a closed feeding structure according to claim 3, characterized in that: The surface of the bent plate (11) in contact with the inner wall of the tank body (1) is coated with a silicon carbide ceramic coating (15).

5. The chemical reactor with a closed feeding structure according to claim 1, characterized in that: The auxiliary component (10) includes a plurality of folding plates (16), which are arranged obliquely in the jacket (6), and a deflection channel is formed between adjacent folding plates (16), and the opening (17) of the folding plate (16) at the bottom is arranged below the side of the adjacent upper folding plate (16) away from the opening (17) to guide the steam to flow along the deflection channel.

6. The chemical reactor with a closed feeding structure according to claim 5, characterized in that: A guide plate (18) is provided at the opening (17) of the folding plate (16), and the guide plate (18) is fixed to the folding plate (16). Both sides of the guide plate (18) are inclined surfaces (19) for guiding condensed water to a discharge outlet (20) at a connection between the opening (17) of the folding plate (16) and the inner wall of the jacket (6).

7. The chemical reactor with a closed feeding structure according to claim 2, characterized in that: A heat-conducting fin (21) is fixedly provided on the outside of the auxiliary frame (9), and the heat-conducting fin (21) extends radially along the stirring shaft (4).

8. The chemical reactor with a closed feeding structure according to claim 1, characterized in that: The stirring blades (5) are provided in two groups and are distributed axially along the stirring shaft (4).

9. The chemical reactor with a closed feeding structure according to claim 1, characterized in that: A condensate pipe (22) is fixedly provided at the bottom of the jacket (6) for discharging steam condensate.

10. The chemical reactor with a closed feeding structure according to claim 5, characterized in that: The outlet of the steam inlet pipe (7) is located below the high side of the bottom folding plate (16), so as to force the steam to fill the area below the folding plate (16) before entering the upper folding channel.

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