A multi-stage super-gravity rotating disc reactor device for intensifying micro-mixing and reaction

Abstract

The present application relates to a kind of multi-stage supergravity rotating disc reactor device of reinforced micro-mixing and reaction, including reactor, it includes central shaft, rotating disc is arranged on central shaft, liquid flow channel is arranged on the edge of rotating disc;Temperature control structure is arranged on the reactor, for regulating the temperature of liquid in the reactor;Wherein, microstructure is arranged on the surface of rotating disc, for reinforcing micro-mixing and reaction effect;Rotating disc surface is not set microstructure and is smooth disc, the hole is set in the center of smooth disc, for being inserted into central shaft, different rotating disc is formed by being set different microstructure in smooth disc, and microstructure includes microgroove structure and hydrophobic layer.The rotating disc structure of the present application can effectively improve the micro-mixing and reaction effect of rotating disc reactor, shorten reaction time, and the temperature control cavity can effectively regulate the reaction temperature.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of supergravity, in particular to a multi-stage supergravity rotating disc reactor device for strengthening micro-mixing and reaction. BACKGROUND

[0002] Supergravity technology is a technology based on the study of physical and chemical changes of materials under a force far greater than gravity. The technology is mainly realized by the controllable centrifugal field formed by the high-speed rotating rotor in the supergravity equipment. The existing supergravity reactor can be applied to gas-liquid, gas-liquid-solid, liquid-liquid and other systems for absorption, extraction, mixing, multiphase reaction and other processes. The supergravity reactor can strengthen the interphase transfer and reaction process, and is a good process intensification equipment. Since the supergravity technology was proposed, there have been many types of supergravity equipment. The single-stage rotating disc reactor enhances the effects of heat transfer and mass transfer by forming a high-shear liquid film through the centrifugal action of the rotating disc. However, the single-stage rotating disc reactor has poor micro-mixing efficiency and limited processing capacity.

[0003] Therefore, the present application provides a multi-stage supergravity rotating disc reactor device for strengthening micro-mixing and reaction. SUMMARY

[0004] The present application provides a multi-stage supergravity rotating disc reactor device for strengthening micro-mixing and reaction, which can effectively improve the micro-mixing and reaction effect of the rotating disc reactor, shorten the reaction time, and effectively control the reaction temperature by using the multi-stage rotating disc reactor rotating disc structure.

[0005] The technical solutions adopted by the present application are as follows:

[0006] A multi-stage supergravity rotating disc reactor device for strengthening micro-mixing and reaction, comprising:

[0007] A reactor comprising a central shaft, a rotating disc arranged on the central shaft, and a liquid flow channel arranged on the edge of the rotating disc;

[0008] A temperature control structure arranged on the reactor for controlling the temperature of the liquid in the reactor;

[0009] Wherein, a microstructure is arranged on the surface of the rotating disc for strengthening the micro-mixing and reaction effect.

[0010] Further features of the present application are as follows:

[0011] The reactor is provided with an upper end cover at the top and a lower end cover at the bottom, and the lower end cover is arranged in a fixed frame. The reactor further comprises a distance sleeve for positioning and axially fixing the rotating disc.

[0012] The temperature control structure comprises a heat transfer partition plate, a distance adjusting gasket, a cooling cavity, a stepped partition plate and a support block, the heat transfer partition plate is arranged on the front and back surfaces of the rotating disc, the inner side of the heat transfer partition plate is positioned and fixed by an upper end cover, the stepped partition plate and a lower end cover, the distance adjusting gasket is located between the heat transfer partition plate and the liquid flow channel, the distance between the heat transfer partition plate and the rotating disc is adjusted through the distance adjusting gasket, the stepped partition plate is located between adjacent rotating discs, the cooling cavity is a reserved cavity between the upper end cover, the stepped partition plate, the lower end cover and the heat transfer partition plate, and is used for entering the cooling liquid into the cooling cavity to control the liquid temperature, and the support block is arranged between the heat transfer partition plates on the front and back surfaces of the rotating disc and is used for supporting the heat transfer partition plate.

[0013] The support block is provided with a temperature measuring hole at the edge of the rotating disc, and a temperature measuring probe is inserted into the temperature measuring hole to detect the temperature of the experimental liquid in real time.

[0014] The surface of the rotating disc is not provided with a microstructure, and is a smooth disc, a hole is arranged in the center of the smooth disc and is used for sleeving a central shaft, different rotating discs are formed by arranging different microstructures on the smooth disc, and the microstructure comprises a micro groove structure and a hydrophobic layer.

[0015] A rectangular cross-section concentric groove is arranged on the surface of the smooth disc, that is, a micro groove structure is arranged, and a concentric single groove disc is formed, and is used for strengthening passive mixing in the process of radial spreading of a liquid film.

[0016] Eight rectangular cross-section concentric grooves are sequentially and equidistantly arranged on the surface of the smooth disc, that is, eight micro groove structures are arranged, a concentric eight-groove disc is formed, and is used for strengthening passive mixing in the process of radial spreading of a liquid film.

[0017] Radial rectangular grooves are equidistantly arranged on the surface of the smooth disc, that is, radial micro groove structures are arranged, a radial sixteen-groove disc is formed, and is used for forming radial vortex to break the liquid film and enhance the micro mixing effect.

[0018] A circular ring hydrophobic layer is sprayed on the surface of the smooth disc, an inlet area hydrophobic disc is formed, and is used for reducing energy dissipation of the liquid, increasing initial kinetic energy of the liquid and initial spreading speed.

[0019] A circular ring hydrophobic layer is sprayed on the surface of the smooth disc, and radial hydrophobic layers are equidistantly sprayed outside the circular ring hydrophobic layer, a radial hydrophobic disc is formed, and is used for disturbing the liquid film on the hydrophilic-hydrophobic critical surface, breaking the liquid film and enhancing the micro mixing effect.

[0020] The beneficial effects of the present application are as follows:

[0021] The application has the advantages that the structure is compact and reasonable, the operation is convenient, and the application can be suitable for different scale fast reaction or sensitive reaction system; the multi-stage system is adopted, the treatment capacity is significantly increased, the structure is simple and compact, the disassembly and replacement are convenient, and the application is easy to enlarge and popularize and apply in industry; different surface microstructures can be constructed according to the reaction type and reaction condition, the application is wide, and the product quality is improved significantly; the residence time of the material in the reaction device is prolonged by adopting multiple rotating discs, the residence time is controllable, and the micro mixing effect and reaction performance can be effectively improved.

[0022] Meanwhile, the application also has the following advantages:

[0023] (1) By designing the cooling cavity and the temperature measuring hole, the micro mixing and the reaction temperature can be controlled according to the reaction type and the reaction condition, and the product quality is improved.

[0024] (2) A rectangular cross-section concentric groove with a width of 0.3mm-0.5mm and a depth of 0.1-0.2mm is arranged at a distance of 25mm from the center of the smooth disc surface, that is, the micro groove structure is added to the surface to form a concentric single groove disc; compared with the smooth disc, the circumferential micro groove strengthens the passive mixing of the liquid film in the radial spreading process of the liquid film, and the concentric wave disturbance makes the micro mixing effect better.

[0025] (3) Eight rectangular cross-section concentric grooves with a width of 0.3mm-0.5mm and a depth of 0.1-0.2mm are arranged at a distance of 25mm from the center of the smooth disc surface, that is, eight micro groove structures are added to the surface to form a concentric eight-groove disc, compared with the concentric single groove disc, the liquid film is affected by the micro groove structure from flowing into the disc surface to flowing out of the disc surface, so that the disc surface can generate greater shear force on the liquid film when the liquid film flows, the refresh rate of the liquid film is higher, and the fast reaction is more beneficial.

[0026] (4) Radial rectangular grooves with a width of 0.3mm-0.5mm and a depth of 0.1-0.2mm are arranged at equal intervals on the surface of the smooth disc, that is, radial micro groove structures are added to the surface to form a radial sixteen-groove disc; the liquid film is affected by the radial micro groove structure when flowing into the disc surface and flowing out of the disc surface, and the rotating groove can drive the liquid film to form many radial vortices in the process of flowing through the radial groove, which has a stronger breaking effect, so that the liquid film is more easily broken, and the micro mixing effect is better.

[0027] (5) In the center of the smooth disc surface 20-23 mm, spray a ring hydrophobic layer to form the inlet area hydrophobic disc; the contact between the liquid and the rotating disc surface is a dynamic process. In the process of impacting the rotating disc surface, the liquid overcomes the surface tension, adhesion and friction. In the initial state, due to the small centrifugal force received by the liquid, the liquid mainly spreads outward under the action of inertia. This process converts part of the kinetic energy of the liquid into surface energy, and part of the kinetic energy is dissipated by viscosity. Compared with the hydrophilic surface, coating a hydrophobic layer in the inlet area helps to reduce the energy dissipation of the liquid, increase the initial kinetic energy of the liquid and the initial spreading speed.

[0028] (6) In the center of the smooth disc surface 20-23 mm, spray a ring hydrophobic layer, and spray a radial hydrophobic layer with a width of 0.3-0.5 mm and a depth of 0.1-0.2 mm on the rotating disc surface to form a radial hydrophobic disc. Compared with the inlet area hydrophobic disc, in addition to reducing the energy dissipation of the liquid when impacting the solid-liquid contact, the liquid film is tightly adhered to the solid wall surface due to the adhesion of the wall surface when flowing over the hydrophilic layer surface, and the solid-liquid contact angle is small. When contacting the hydrophobic surface, due to the relatively large surface tension of the hydrophobic layer, the liquid film quickly moves to the hydrophobic layer surface, and at the same time, the liquid film quickly spreads outward due to the centrifugal force received by the rotating disc. Under the action of these combined forces, the liquid film is disturbed on the hydrophilic-hydrophobic critical surface, has a stronger breaking effect, and is more easily broken, so that the micro-mixing effect is better. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 The structure of the present application is shown in the figure.

[0030] Figure 2 The reactor profile of the present application is shown in the figure.

[0031] Figure 3 The structure of the present application is shown in the figure.

[0032] Figure 4 The structure of the present application is shown in the figure.

[0033] Figure 5 The structure of the present application is shown in the figure.

[0034] Figure 6 The structure of the present application is shown in the figure.

[0035] Figure 7 The structure of the present application is shown in the figure.

[0036] Figure 8 The structure of the present application is shown in the figure.

[0037] Figure 9 The structure of the present application is shown in the figure.

[0038] Figure 10 This is a schematic diagram of the micro-mixing principle of the present invention.

[0039] The components include: 1. Reactor; 2. Temperature control structure; 3. Upper end cover; 4. Lower end cover; 5. Fixing frame; 101. Central shaft; 102. Turntable; 103. Spacing sleeve; 104. Liquid flow channel; 201. Heat transfer baffle; 202. Adjustable spacing gasket; 203. Cooling cavity; 204. Stepped baffle; 205. Support block; 206. Temperature measuring hole; 301. Liquid injection hole; 401. Material collection tank; 1021. Smooth disc; 1022. Concentric single-slot disc; 1023. Concentric eight-slot disc; 1024. Radial sixteen-slot disc; 1025. Inlet area drainage disc; 1026. Radial drainage disc. Detailed Implementation

[0040] The specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0041] like Figures 1-3 As shown, a multi-stage centrifugal rotating disk reactor device for enhancing micro-mixing and reaction includes a reactor 1, a temperature control structure 2, an upper end cover 3, a lower end cover 4, and a fixing frame 5. The fixing frame 5 has a recessed design, and the lower end cover 4 is located in the recess of the fixing frame 5, and the lower end cover 4 is connected to the fixing frame 5 by bolts. The temperature control structure 2 is mounted on the reactor 1.

[0042] Reactor 1 includes a central shaft 101, a turntable 102, a spacer sleeve 103, and a liquid flow channel 104. The turntable 102 is connected to the central shaft 101 for rotation and is positioned and axially fixed by the spacer sleeve 103. The liquid flow channel 104 is arranged along the edge of the turntable 102. Multiple turntables 102 are provided, including three or other quantities, and all multiple turntables 102 are arranged inside reactor 1.

[0043] The temperature control structure 2 includes heat transfer baffles 201, adjustable spacers 202, cooling cavities 203, stepped baffles 204, and support blocks 205. Six heat transfer baffles 201 are provided, or other quantities, the number of heat transfer baffles 201 being twice the number of turntables 102, and arranged on both sides of the turntables 102. The inner sides of the heat transfer baffles 201 are positioned and fixed by the upper end cover 3, the stepped baffles 204, and the lower end cover 4, respectively. The adjustable spacers 202 are located between the heat transfer baffles 201 and the liquid flow channel 104. The distance between the heat transfer baffle 201 and the turntable 102 is adjusted by adjusting the shims 202. The stepped baffle 204 is located between adjacent turntables 102. The cooling cavity 203 is a pre-reserved cavity between the upper end cover 3, the stepped baffle 204, the lower end cover 4, and the heat transfer baffle 201. The width of the pre-reserved cavity is 3-5mm, which facilitates the entry of coolant into the cooling cavity 203 to cool the liquid. The support block 205 is arranged between the heat transfer baffles 201 on both sides of the turntable 102, which serves to support the heat transfer baffles 201. The support block 205 has a temperature measuring hole 206 with a diameter of 0.4-0.6mm at the edge of the turntable 102, which facilitates the insertion of a temperature measuring probe to detect the temperature of the experimental liquid in real time.

[0044] The upper end cover 3 and the lower end cover 4 are respectively set at the upper and lower ends of the reactor 1. The upper end cover 3 is provided with a liquid injection hole 301, and the bottom of the lower end cover 4 is provided with a material collection tank 401. The lower end cover 4 and the material collection tank 401 are connected by bolts. A beaker is placed below the material collection tank 401 to facilitate the collection of liquid after the reaction.

[0045] like Figures 4-9 As shown, the turntable 102 is a smooth circular disk 1021 with a diameter of 200 mm and a thickness of 8-10 mm, with a 40 mm diameter hole in the center to facilitate the insertion of the central shaft 101. Different turntables 102 are formed by setting different microstructures on the surface of the smooth circular disk 1021. By selecting turntables 102 with different surface microstructures, it is convenient to investigate the micro-mixing effect of liquid passing through turntables 102 with different surface microstructures. The microstructure can be a microgroove structure, a hydrophobic layer, or other structures.

[0046] A concentric groove with a rectangular cross-section, 0.3mm-0.5mm wide and 0.1-0.2mm deep, is opened on the surface of the smooth disk 1021 at a distance of 25mm from the center. This is called adding a microgroove structure to the surface to form a concentric single-groove disk 1022. Compared with the smooth disk 1021, the addition of a microgroove structure to the surface enhances the passive mixing of the liquid film during the radial spread of the liquid film. The concentric wave disturbance is brought forward, resulting in a better micro-mixing effect.

[0047] Eight concentric rectangular cross-section grooves with width of 0.3mm-0.5mm and depth of 0.1-0.2mm are opened on the surface of the smooth disc 1021 at equal intervals at a distance of 25mm from the center, i.e. eight micro groove structures are added to the surface to form a concentric eight-groove disc 1023. Compared with the concentric single-groove disc 1022, the liquid film is affected by the micro groove structure during the process of flowing into the disc surface and flowing out of the disc surface, so that the disc surface can generate greater shear force on the liquid film when the liquid film flows, the refresh rate of the liquid film is higher, and the rapid reaction is more conducive to the progress.

[0048] Radial rectangular grooves with width of 0.3mm-0.5mm and depth of 0.1-0.2mm are opened on the surface of the smooth disc 1021 at equal intervals, i.e. radial micro groove structures are added to the surface to form a radial sixteen-groove disc 1024; the liquid film is affected by the radial micro groove structure during the process of flowing into the disc surface and flowing out of the disc surface, and at the same time, the rotating groove can drive the liquid film to form many radial eddies during the process of flowing through the radial groove, which has a stronger breaking effect, so that the liquid film is more easily broken and the micro mixing effect is better.

[0049] A circular ring hydrophobic layer is sprayed on the surface of the smooth disc 1021 at a distance of 20-23mm from the center to form an inlet area hydrophobic disc 1025; the contact between the liquid and the surface of the rotating disc 102 is a dynamic process. During the process of impacting the surface of the rotating disc 102, the liquid overcomes the surface tension, adhesion and friction. In the initial state, since the centrifugal force acting on the liquid is small, the liquid mainly spreads outward under the action of inertia force. This process converts part of the kinetic energy of the liquid into surface energy, and part of the kinetic energy is dissipated by viscosity. Compared with the hydrophilic surface, the hydrophobic layer on the inlet area helps to reduce the energy dissipation of the liquid, increase the initial kinetic energy of the liquid and the initial spreading speed.

[0050] A circular ring hydrophobic layer is sprayed on the surface of the smooth disc 1021 at a distance of 20-23mm from the center, and a radial hydrophobic layer with width of 0.3mm-0.5mm and depth of 0.1-0.2mm is sprayed on the surface of the rotating disc at equal intervals to form a radial hydrophobic disc 1026. Compared with the inlet area hydrophobic disc 1025, in addition to reducing the energy dissipation when the liquid impacts the solid-liquid contact, the liquid film is tightly adhered to the solid wall surface due to the adhesion of the wall surface when the liquid film flows over the hydrophilic layer surface, and the solid-liquid contact angle is small; when the liquid film contacts the hydrophobic surface, the liquid film quickly moves to the hydrophobic layer surface due to the relatively large surface tension of the hydrophobic layer, and at the same time, the liquid film quickly spreads outward under the action of the centrifugal force caused by the rotation of the rotating disc. Under the action of such combined forces, the liquid film is disturbed on the hydrophilic-hydrophobic critical surface, has a stronger breaking effect, and the liquid film is more easily broken, so that the micro mixing effect is better.

[0051] As Figure 2 and Figure 10The multi-stage rotating disc reactor device of the present application enhances micro-mixing and reaction principle: according to the reaction type and reaction conditions, the appropriate rotating disc 102, cooling liquid and adjusting the height of the adjusting distance gasket 202 are selected. The material is poured along the liquid injection hole 301, the experimental material enters the three rotating discs 102 in turn along the liquid flow channel 104, and finally enters the material collection tank 401. The reaction temperature is controlled by the cooling cavity 203 and the heat transfer partition plate 201, and the reaction temperature is monitored in real time through the temperature measuring hole 206. The specific material flow and temperature control fluid injection position are as shown in Figure 10

[0052] Using the multi-stage rotating disc reactor device of the present application, the iodide-iodate reaction system can be used to determine the micro-mixing efficiency in different reactors. Studies have shown that the micro-mixing enhancement effect of the concentric single groove disc 1022 is poorer than that of the concentric eight groove disc 1023, and the radial sixteen groove disc 1024 has the best enhancement effect. Especially for the radial sixteen groove disc 1024, the radial groove has a stronger disturbance effect on the liquid film surface wave, and the micro-mixing enhancement effect is significantly enhanced compared with the circumferential groove disc. The circumferential groove makes the spiral wave more easily broken, but the radial groove makes the surface wave once occur to be broken by the radial micro-groove, forming a large number of small three-dimensional waves. Compared with the smooth disc 1021, the micro-mixing enhancement effect of the hydrophobic disc 1022 in the inlet area is better. Because of the spraying of the hydrophobic layer in the inlet area, the initial spreading resistance of the material can be reduced, which helps the rapid spreading of the liquid film and increases the initial spreading area of the liquid film on the rotating disc surface under the action of rotating supergravity.

[0053] The above description is an explanation of the present application, not a limitation of the invention, the scope of the present application is defined in the claims, within the protection scope of the present application, any form of modification can be made.​

Claims

1. A multi-stage high-gravity rotating disc reactor device for intensifying micro-mixing and reactions, characterized in that, The application relates to a reactor (1) comprising a central shaft (101) provided with a rotating disc (102) on the central shaft (101), and a liquid flow channel (104) arranged at the edge of the rotating disc (102); a temperature control structure (2) arranged on the reactor (1) and used for regulating the temperature of liquid in the reactor (1); wherein the rotating disc (102) is provided with a plurality of; the surface of the rotating disc (102) is a smooth disc (1021) without microstructure at the beginning, equidistant radial rectangular grooves are arranged on the surface of the smooth disc (1021) to form a radial sixteen-groove disc (1024) for forming a radial vortex to break liquid film and enhance micro-mixing effect. The application further comprises a fixing frame (5) used for supporting the reactor (1); the reactor (1) is provided with an upper end cover (3) at the top and a lower end cover (4) at the bottom, the lower end cover (4) is arranged in the fixing frame (5), and the reactor (1) further comprises a distance sleeve (103) used for positioning and axially fixing the rotating disc (102). The temperature control structure (2) comprises a heat transfer partition plate (201), a distance adjusting gasket (202), a cooling cavity (203), a stepped partition plate (204) and a supporting block (205); the heat transfer partition plate (201) is arranged on the front and back surfaces of the rotating disc (102), the inner side of the heat transfer partition plate (201) is positioned and fixed by the upper end cover (3), the stepped partition plate (204) and the lower end cover (4) respectively, the distance adjusting gasket (202) is arranged between the heat transfer partition plate (201) and the liquid flow channel (104), the distance between the heat transfer partition plate (201) and the rotating disc (102) is adjusted through the distance adjusting gasket (202), the stepped partition plate (204) is arranged between adjacent rotating discs (102), the cooling cavity (203) is a reserved cavity between the upper end cover (3), the stepped partition plate (204), the lower end cover (4) and the heat transfer partition plate (201), cooling liquid enters the cooling cavity (203) to cool liquid, and the supporting block (205) is arranged between the heat transfer partition plates (201) on the front and back surfaces of the rotating disc (102) and used for supporting the heat transfer partition plates (201). The supporting block (205) is provided with a temperature measuring hole (206) at the edge of the rotating disc (102) and used for a temperature measuring probe to penetrate in and detect the temperature of experimental liquid in real time. The smooth disc (1021) is provided with a hole in the center and used for sleeving the central shaft (101).

2. A multi-stage supergravity rotating disc reactor device for intensifying micro-mixing and reactions as claimed in claim 1, characterized in that: ​ 3. A multi-stage high-gravity rotating disc reactor device for intensifying micro-mixing and reactions as claimed in claim 2, characterized in that: ​ 4. A multi-stage high-gravity rotating disc reactor device for intensifying micro-mixing and reactions as claimed in claim 3, wherein: ​ 5. The multi-stage high-gravity turntable reactor device for intensifying micro-mixing and reaction according to claim 1, characterized in that: ​

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