Double-stirring reaction kettle

Abstract

The utility model discloses a double-stirring reaction kettle, which relates to the technical field of reaction kettles and comprises a kettle body, a main stirrer and an auxiliary stirrer, the main stirrer comprises a rotary driver I, a main stirring shaft, a main stirring paddle I and a main stirring paddle II; the main stirring shaft is arranged in the inner cavity of the kettle body; a rotary driving end of the rotary driver I is in transmission connection with the upper end of the main stirring shaft; the main stirring paddle I is arranged on the main stirring shaft, is positioned in the middle of the inner cavity of the kettle body and can drive materials in the kettle body to flow downwards; the main stirring paddle II is mounted on the main stirring shaft and close to the bottom of the inner cavity of the kettle body and can drive materials at the bottom of the kettle body to rotate and centrifuge; the auxiliary stirrer comprises a rotary driver II, an auxiliary stirring shaft and a dispersion disc; the auxiliary stirring shaft corresponds to the peripheral side of the main stirring shaft; the rotary driving end of the rotary driver II is in transmission connection with the auxiliary stirring shaft to drive the auxiliary stirring shaft to rotate; the dispersing disc is mounted on the auxiliary stirring shaft and is positioned above the main stirring paddle I to shear and disperse materials. The device is reasonable in structure and low in energy consumption, and the mass transfer efficiency is remarkably improved.

Description

Technical Field

[0001] This utility model relates to the field of reaction vessel technology, and in particular to a double-stirred reaction vessel. Background Technology

[0002] Stirred reactors are widely used in industry for mixing, reaction, heat transfer, and mass transfer. When processing liquid materials, especially in multiphase systems such as gas-liquid, liquid-liquid, and solid-liquid reactions, the mass transfer rate is often a key factor limiting reaction efficiency and yield.

[0003] Traditional single-stirred reactors have the following limitations in enhancing mass transfer:

[0004] The contradiction between overall circulation and local shear: large-size low-speed impellers (such as propellers and inclined blade turbines) can provide good overall circulation, but insufficient local shear force; small-size high-speed impellers (such as disc turbines and serrated discs) can provide high shear, but weak overall circulation capacity and are prone to dead zones.

[0005] Insufficient mass transfer in specific areas: Areas such as the bottom of the reactor, near the wall, or near the liquid surface often suffer from low mass transfer efficiency due to uneven flow field distribution.

[0006] Low energy efficiency: In order to achieve the required mass transfer effect, sometimes a single agitator needs to run at high speed, which leads to a significant increase in energy consumption.

[0007] Existing technologies include some dual-stirring or multi-layer stirring designs, such as combined stirrers (e.g., anchor + turbine): mainly used to solve the mixing of high-viscosity materials, with the anchor impeller responsible for wall renewal and the turbine responsible for central mixing; however, their effect on enhancing micro-mass transfer (e.g., bubble / droplet dispersion) is limited, and their structure is complex and energy consumption may be high.

[0008] Therefore, how to provide a dual-stirred reactor that can more effectively address the needs of overall circulation and local high shear, specifically enhance the mass transfer process in key areas within the reactor, especially for liquid material systems, significantly improve mixing and reaction efficiency while reducing energy consumption, and possess good adaptability is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0009] In view of this, the present invention proposes a dual-stirring reactor, which aims to solve the technical problem that the above-mentioned traditional stirred reactors cannot simultaneously perform the stirring functions of overall circulation and local shearing, resulting in low mass transfer efficiency.

[0010] To achieve the above objectives, the present invention adopts the following technical solution:

[0011] This utility model provides a dual-stirring reactor, comprising: a reactor body, a main stirrer, and a secondary stirrer;

[0012] The main agitator includes a rotary driver, a main agitator shaft, a main agitator blade, and a main agitator blade. The main agitator shaft is axially arranged in the inner cavity of the vessel body. The rotary driver is driven by a drive end connected to the upper end of the main agitator shaft to drive its rotation. The main agitator blade is mounted on the main agitator shaft and located in the middle of the inner cavity of the vessel body, and can drive the material in the vessel body to flow downward. The main agitator blade is mounted on the main agitator shaft and close to the bottom of the inner cavity of the vessel body, and can drive the material at the bottom of the vessel body to rotate and centrifuge.

[0013] The auxiliary stirrer includes a second rotary driver, an auxiliary stirring shaft, and a dispersion disc; the auxiliary stirring shaft is located in the upper part of the inner cavity of the vessel and corresponds to the outer periphery of the main stirring shaft; the rotary driver is connected to the auxiliary stirring shaft to drive its rotation; the dispersion disc is mounted on the auxiliary stirring shaft and located above the main stirring paddle to shear and disperse the flowing material.

[0014] This invention relates to a dual-stirred reactor. A main stirrer establishes a large-scale, unified circulation of liquid materials within the reactor, ensuring macroscopic homogeneity of the material. Simultaneously, a secondary stirrer is positioned in a critical mass transfer region. This secondary stirrer is specifically designed to provide intense, localized turbulence and high shear forces to efficiently break up bubbles, droplets, agglomerated solid particles, or disrupt the mass transfer boundary layer, thereby significantly enhancing the microscopic mass transfer process. The main and secondary stirrers work synergistically in terms of function and flow field, achieving a highly efficient mass transfer mode of "macroscopic circulation + microscopic enhancement." The main agitator consists of two main components: a first main agitator pushes liquid material axially from top to bottom to establish the main circulation; a second main agitator drives the liquid material at the bottom of the vessel to rotate and centrifuge, enhancing radial mixing and preventing sedimentation; and a dispersion disk located above the first main agitator, within the core circulation path of the main agitator, which is the essential path for material circulation and a key area with low mass transfer efficiency. When the strongly circulating material flows through its area of ​​action, the dispersion disk applies extremely high local shear rates and turbulence intensity, forcefully breaking up the dispersed phase (bubbles, droplets, particles), dispersing agglomerates, and thinning the boundary layer, thereby greatly enhancing the local mass transfer rate in that region. This invention features a reasonable structure, low energy consumption, and significantly improved mass transfer efficiency, making it suitable for optimizing mass transfer in processes such as mixing, reaction, and dispersion of liquid materials.

[0015] As a further improvement to the above technical solution, the main stirring paddle is an axial flow stirring paddle with a diameter of 0.3-0.4 times the inner diameter of the vessel.

[0016] As a further improvement to the above technical solution, the second main stirring paddle is a radial flow stirring paddle with a diameter of 0.4-0.6 times the inner diameter of the vessel.

[0017] As a further improvement to the above technical solution, the diameter of the dispersion disk is 0.2-0.3 times the diameter of the main stirring paddle.

[0018] As a further improvement to the above technical solution, a baffle plate is also included, which is fixed to the inner wall of the vessel along the height direction of the vessel body.

[0019] The beneficial effects of the above technical solution are: the baffle plate can increase the backflow and repeated collision of materials during flow, thereby improving the uniformity of mixing of reactants and reaction efficiency.

[0020] As a further improvement to the above technical solution, the dispersion disk corresponds to the outer peripheral side of the main stirring paddle and the inner wall of the vessel.

[0021] As a further improvement to the above technical solution, both the first rotary driver and the second rotary driver are drive motors.

[0022] As a further improvement to the above technical solution, the rotational speed of the main stirring shaft is 1500-3000 revolutions per minute.

[0023] As a further improvement to the above technical solution, the rotational speed of the auxiliary stirring shaft is 200-400 revolutions per minute.

[0024] As a further improvement to the above technical solution, there are multiple dispersion discs, all of which are located below the secondary stirring shaft and are arranged at intervals along the axial direction of the secondary stirring shaft.

[0025] The beneficial effects of the above technical solution are: setting up multiple dispersion disks increases the range of action path length and improves the effect of local high shear and turbulence.

[0026] As can be seen from the above technical solution, compared with the prior art, the present invention discloses a double-stirred reactor, which has the following advantages and beneficial effects:

[0027] 1. The reaction vessel of this utility model has a simple structure, involves few devices, and has low cost. It is suitable for simple modification of existing reaction vessel equipment to improve stirring reaction efficiency and enhance product quality.

[0028] 2. This utility model can significantly improve the mixing effect and achieve efficient mass transfer of materials through the synergistic effect of the main and auxiliary agitators.

[0029] 3. The position of the auxiliary stirrer of this utility model can be flexibly designed. It can be precisely deployed in the area with the greatest mass transfer resistance to achieve "targeted" enhancement.

[0030] 4. The reaction vessel of this utility model optimizes energy consumption. The main stirrer can operate at a lower speed to meet the circulation requirements, while the auxiliary stirrer, which plays an auxiliary role, only operates at high speed in key areas and when needed to provide high shear force. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0032] Figure 1 This utility model provides a schematic diagram of a double-stirred reaction vessel structure.

[0033] In the diagram: 1. Vessel body; 2. Main agitator; 21. Rotary actuator one; 22. Main stirring shaft; 23. Main stirring paddle one; 24. Main stirring paddle two; 3. Auxiliary agitator; 31. Rotary actuator two; 32. Auxiliary stirring shaft; 33. Dispersion disc; 34. Auxiliary stirring shaft protective sleeve; 4. Baffle plate; 41. Flow notch; 5. Manhole structure; 6. Feed inlet; 7. Discharge outlet; 8. Jacket; 81. Jacket medium inlet; 82. Jacket medium outlet; 9. Overflow port; 10. Support. Detailed Implementation

[0034] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0035] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", 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.

[0036] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0037] 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 mechanical connection or an electrical connection; 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0038] According to the embodiments of this utility model, such as Figure 1 As shown, a dual-stirring reactor includes: a reactor body 1, a main stirrer 2, and a secondary stirrer 3;

[0039] The main agitator 2 includes a rotary driver 21, a main agitator shaft 22, a main agitator paddle 23, and a main agitator paddle 24. The main agitator shaft 22 is axially arranged in the inner cavity of the vessel body 1. The rotary driver 21 is driven by a drive connection to the upper end of the main agitator shaft 22 to drive it to rotate. The main agitator paddle 23 is coaxially fixedly installed on the main agitator shaft 22 and located in the middle of the inner cavity of the vessel body 1, and can drive the material in the vessel body 1 to flow downward. The main agitator paddle 24 is coaxially fixedly installed on the main agitator shaft 22 and close to the bottom of the inner cavity of the vessel body 1, and can drive the material at the bottom of the vessel body 1 to rotate and centrifuge.

[0040] The auxiliary stirrer 3 includes a rotary driver 31, an auxiliary stirring shaft 32, and a dispersing disk 33. The auxiliary stirring shaft 32 is located in the upper part of the inner cavity of the vessel body 1 and corresponds to the outer periphery of the main stirring shaft 22. The rotary driver 31 is connected to the auxiliary stirring shaft 32 to drive its rotation. The dispersing disk 33 is installed on the auxiliary stirring shaft 32 and located above the main stirring paddle 23 to shear and disperse the flowing material.

[0041] This embodiment of a dual-stirred reactor utilizes a main stirrer 2 located in the main body of the reactor to establish a large-scale, integrated circulation of liquid materials within the reactor body 1. This main stirrer 2 features a double-layered impeller capable of generating strong axial flow and moderate radial flow, ensuring macroscopically uniform mixing of the materials. Simultaneously, a secondary stirrer 3 is located in a critical mass transfer region. This secondary stirrer 3 is specifically designed to provide intense, localized turbulence and high shear force to efficiently break up bubbles, droplets, agglomerated solid particles, or disrupt the mass transfer boundary layer, thereby significantly enhancing the microscopic mass transfer process. The main and secondary stirrers work synergistically in terms of function and flow field, achieving a highly efficient mass transfer mode of "macroscopic circulation + microscopic enhancement." The main stirring paddle 23 is used to push liquid material from top to bottom along the axial direction to establish the main circulation; the main stirring paddle 24 is used to drive the liquid material at the bottom of the vessel 1 to rotate and centrifuge, enhance radial mixing, and prevent sedimentation; the dispersion disk 33 is designed above the main stirring paddle 23, located within the core circulation path of the main stirrer 2, which is the necessary path for material circulation and a key area with low mass transfer efficiency; when the strongly circulating material flows through its area of ​​action, the dispersion disk 33 applies extremely high local shear rates and turbulence intensities, powerfully breaking up dispersed phase bubbles, droplets, and particles, dispersing agglomerates, and thinning the boundary layer, thereby greatly enhancing the local mass transfer rate in this area. This utility model has a reasonable structure, low energy consumption, and significantly improved mass transfer efficiency, and is suitable for optimizing the mass transfer effect in processes such as mixing, reaction, and dispersion of liquid materials.

[0042] Specifically, the housings of rotary drive 1 21 and rotary drive 2 31 are both fixedly mounted on the top of the vessel body 1; rotary drive 2 31 is located on one side of rotary drive 1 21. The drive shaft of rotary drive 1 21 is driven to the upper end of the main stirring shaft 22; the drive shaft of rotary drive 2 31 is driven to the upper end of the auxiliary stirring shaft 32.

[0043] Specifically, a manhole structure 5 is provided on the top of the vessel body 1, on the side away from the rotary actuator 21. A feed inlet 6 is located on the top of the vessel body 1, on the side away from the rotary actuator 21, and a discharge outlet 7 is located at the center of the bottom of the vessel body 1. The outer and bottom walls of the vessel body 1 are covered by a jacket 8; the bottom of the jacket 8 has a jacket medium inlet 81 on the side corresponding to the discharge outlet 7, and the top outer wall of the jacket 8 has a jacket medium outlet 82. Multiple supports 10 are evenly welded and fixed to the outer wall of the vessel body 1 along the axial direction. The vessel body 1 is made of 316L stainless steel and has a tank body, top cover / bottom end cap, and a volume of 3000L, suitable for processing low-viscosity liquid materials.

[0044] In some embodiments, the main stirring paddle 23 is an axial flow stirring paddle with a diameter of 0.3-0.4 times the inner diameter of the vessel body 1.

[0045] Specifically, the diameter of the main stirring paddle 23 is 0.35 times the inner diameter of the vessel body 1.

[0046] In some embodiments, the main stirring paddle 24 is a radial flow stirring paddle with a diameter of 0.4-0.6 times the inner diameter of the vessel body 1.

[0047] Specifically, the diameter of the main stirring paddle 24 is 0.5 times the inner diameter of the vessel body 1.

[0048] Specifically, the main agitator 23 can be any of the following: a three-bladed swept-back agitator, a high-efficiency axial flow agitator, a wide-bladed airfoil agitator, or a slanted-blade turbine agitator. Angle optimization is used to achieve predominantly axial flow. The core function of the main agitator 23 is to establish a strong circulating flow from the bottom to the top of the vessel or from the top to the bottom, achieving large-scale mixing of the bulk material. The main agitator 24 is a paddle-type radial flow agitator, providing strong radial driving force. Synchronous rotation of the main agitator 23 and the main agitator 24 establishes a strong radial and axial mixing flow. For example, the main agitator 23 can be a 45° slanted-blade turbine, with adjustable main agitation speed.

[0049] In some embodiments, the diameter of the dispersion disk 33 is 0.2-0.3 times the diameter of the main stirring paddle 23.

[0050] Specifically, the diameter of the dispersion disc 33 can be designed to be 0.25 times the diameter of the main agitator 23.

[0051] In some embodiments, a baffle plate 4 is also included, which is fixed to the inner wall of the vessel body 1 along the height direction of the vessel body 1.

[0052] The baffle 4 can increase the backflow and repeated collisions of materials during flow, thereby improving the uniformity of mixing of reactants and reaction efficiency.

[0053] Specifically, the baffle plate 4 is a strip plate arranged along the height direction of the vessel body 1, and one side of its width direction is vertically welded and fixed to the inner wall of the vessel body 1; the baffle plate 4 has an overflow notch 41 on the side near the inner wall of the vessel body 1; the overflow notch 41 can reduce the resistance of the liquid material flowing along the circumferential direction against the inner wall of the vessel body 1, so as to ensure the continuous and stable flow of the mixed material on a large scale.

[0054] Specifically, there are multiple baffles 4, which are evenly distributed along the inner wall of the vessel body 1.

[0055] Specifically, there are two or four baffles 4.

[0056] Specifically, the outer peripheral wall of the vessel body 1 has an overflow port 9; the overflow port 9 is located above the baffle plate 4; the dispersion plate 33 corresponds to the upper part of the baffle plate 4.

[0057] In some embodiments, the dispersion disk 33 corresponds to the outer periphery of the main stirring paddle 23 and the inner wall of the vessel body 1.

[0058] In some embodiments, rotary driver 1 21 and rotary driver 2 31 are both drive motors.

[0059] In some embodiments, the rotational speed of the main stirring shaft 22 is adjustable from 1500 to 3000 revolutions per minute.

[0060] In some embodiments, the rotational speed of the auxiliary stirring shaft 32 is adjustable from 200 to 400 revolutions per minute.

[0061] In some embodiments, there are multiple dispersion disks 33, all located below the auxiliary stirring shaft 32 and spaced apart along the axial direction of the auxiliary stirring shaft 32. Providing multiple dispersion disks 33 increases the range of action path length and improves the effect of localized high shear and turbulence.

[0062] In some embodiments, the dispersion disks 33 are all high-shear dispersion disks with teeth, positioned slightly above the central region inside the vessel (i.e., the area swept by the circulating flow formed by the main agitator and where the dispersed phase easily accumulates). The dispersion disks 33 can be selected from serrated disc agitators, high-shear dispersion disks (with teeth), small-diameter high-speed radial flow turbines, stator-rotor type high-shear heads, etc. Their core function is to apply extremely high local shear rates and turbulence intensity when the strongly circulating material flows through its action area, powerfully breaking up the dispersed phase (bubbles, droplets, particles), dispersing agglomerates, thinning the boundary layer, and instantly breaking it into fine droplets and dispersing it into the system, thereby greatly enhancing the local mass transfer rate in this region, and coordinating with the main agitator to achieve the purpose of enhanced mass transfer.

[0063] Specifically, an auxiliary stirring shaft protective sleeve 34 is coaxially fitted around the external part of the secondary stirring shaft 32; the upper end of the auxiliary stirring shaft protective sleeve 34 penetrates the top wall of the vessel body 1 and is welded and fixed to the vessel body 1; the secondary stirring shaft 32 is rotatably connected inside the auxiliary stirring shaft protective sleeve 34 via bearings; the auxiliary stirring shaft protective sleeve 34 is a steel sleeve, which serves to support and stabilize the secondary stirring shaft 32 and prevent the secondary stirring shaft 32 from shaking during high-speed stirring. The lower part of the secondary stirring shaft 32 extends below the auxiliary stirring shaft protective sleeve 34; multiple dispersion discs 33 are coaxially and fixedly installed at the lower part of the secondary stirring shaft 32 and corresponding to the lower part of the auxiliary stirring shaft protective sleeve 34.

[0064] 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. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0065] 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 double-stirred reaction vessel, characterized in that, include: The vessel body (1), the main stirrer (2), and the auxiliary stirrer (3); The main stirrer (2) includes a rotary driver (21), a main stirring shaft (22), a main stirring paddle (23), and a main stirring paddle (24); the main stirring shaft (22) is arranged axially in the inner cavity of the vessel body (1); the rotary driving end of the rotary driver (21) is connected to the upper end of the main stirring shaft (22) to drive it to rotate; The first main stirring paddle (23) is installed on the main stirring shaft (22) and located in the middle of the inner cavity of the vessel body (1), and can drive the material in the vessel body (1) to flow downward; the second main stirring paddle (24) is installed on the main stirring shaft (22) and close to the bottom of the inner cavity of the vessel body (1), and can drive the material at the bottom of the vessel body (1) to rotate and centrifuge. The auxiliary stirrer (3) includes a second rotary driver (31), an auxiliary stirring shaft (32), and a dispersion disk (33); the auxiliary stirring shaft (32) is located in the upper part of the inner cavity of the vessel body (1) and corresponds to the outer periphery of the main stirring shaft (22); the rotary driving end of the second rotary driver (31) is connected to the auxiliary stirring shaft (32) to drive it to rotate; The dispersion disc (33) is mounted on the auxiliary stirring shaft (32) and located above the main stirring paddle (23) to shear and disperse the flowing material.

2. The double-stirred reactor according to claim 1, characterized in that, The main stirring paddle (23) is an axial flow stirring paddle, and its diameter is 0.3-0.4 times the inner diameter of the vessel body (1).

3. The double-stirred reactor according to claim 1, characterized in that, The second main stirring paddle (24) is a radial flow stirring paddle, and its diameter is 0.4-0.6 times the inner diameter of the vessel body (1).

4. The double-stirred reactor according to claim 1, characterized in that, The diameter of the dispersion disk (33) is 0.2-0.3 times the diameter of the main stirring paddle (23).

5. The double-stirred reactor according to claim 1, characterized in that, It also includes a baffle plate (4), which is fixed to the inner wall of the vessel body (1) along the height direction of the vessel body (1).

6. The double-stirred reactor according to claim 1, characterized in that, The dispersion disk (33) is located between the outer periphery of the main stirring paddle (23) and the inner wall of the vessel body (1).

7. The double-stirred reactor according to claim 1, characterized in that, Both the first rotary driver (21) and the second rotary driver (31) are drive motors.

8. The double-stirred reactor according to claim 7, characterized in that, The main stirring shaft (22) has a rotational speed range of 1500-3000 revolutions per minute.

9. The double-stirred reactor according to claim 7, characterized in that, The rotational speed of the auxiliary stirring shaft (32) is 200-400 revolutions per minute.

10. A double-stirred reactor according to claim 1, characterized in that, There are multiple dispersion discs (33), all of which are located at the lower part of the auxiliary stirring shaft (32) and are arranged at intervals along the axial direction of the auxiliary stirring shaft (32).

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