Micro mixer and method for continuously preparing nano cooling liquid

Abstract

The invention belongs to the technical field of micro-reaction, and particularly relates to a micro-mixer and a method for continuously preparing nano cooling liquid. Comprising a reaction cavity in which a plurality of reaction flow channels are arranged, all the reaction flow channels are used for preparing nano cooling liquid and are vertically arranged in the reaction cavity in a three-dimensional spiral shape, and each reaction flow channel is internally provided with a plurality of disturbance structures and a plurality of distributors which are arranged in the reaction cavity and located above all the reaction flow channels, each distributor is connected with the inlets of all the reaction flow channels, the collectors are arranged at the outlets of all the reaction flow channels, and pressure regulating structures are arranged in the collectors. According to the invention, the distributor is adopted to enable the reaction fluid to flow into the corresponding reaction flow channel, the three-dimensional spiral flow channel design in the reaction cavity is folded in space, so that the overall size of the microreactor is not too large, and a disturbance structure is arranged in each reaction flow channel, so that the mixing efficiency can be further improved; the production rate of the microreactor is improved, and blockage in a flow channel is avoided.

Description

Technical Field

[0001] The invention belongs to the field of micro-reaction technology, and in particular relates to a micro-mixer and a method for continuously preparing nano-cooling liquid. Background Art

[0002] Cooling medium is one of the important components of the engine thermal balance system. Helping the engine maintain the optimal thermal balance temperature is an effective means to improve combustion efficiency and reduce fuel consumption. Nano high boiling point coolant has a higher boiling point and a higher dynamic balance temperature than traditional antifreeze, which reduces the temperature difference with the thermal contact surface and reduces heat loss. When the coolant temperature rises, the higher boiling point and the presence of solid nanoparticles reduce the amount of bubbles generated, avoiding the decrease in coolant flow and heat transfer efficiency due to air resistance factors. In addition, the structure of the radiator will cause strong turbulence in the coolant, which will intensify the collision of nanoparticles and enhance heat transfer. Therefore, at the radiator end, nano coolant has better heat exchange efficiency than traditional antifreeze. In summary, nano high boiling point coolant has the product characteristics of fast low temperature heating and fast high temperature heat dissipation. Under normal working conditions, the coolant maintains a relatively high thermal balance temperature within a safe range, thereby increasing the combustion temperature in the cylinder, making the fuel burn more fully and reducing heat loss; under high load conditions, nano fluid coolant can maintain a more stable heat exchange efficiency than traditional antifreeze, so that the engine has better in-cylinder combustion conditions.

[0003] However, the traditional method, such as application number CN201310022983.4, discloses a copper nanofluid solar coolant and its preparation method. The synthesis of nanofluid coolant is discontinuous, the process is complicated, the output is small, and the prepared nanofluid coolant has poor stability. The demand for coolant is large, and the poor stability leads to serious deposition during the cooling process, which is not conducive to long-term use.

[0004] Microchemical technology, as a cutting-edge technology in the field of modern chemical industry, has significantly improved the reaction rate and heat and mass transfer efficiency with its miniaturized equipment and fine microchannel design. However, microchemical technology still faces challenges in some indicators. For example, the reaction distance in the microreactor is relatively long, and the actual reaction length is generally tens of centimeters or even meters; and some studies have designed some tortuous flow channels to ensure sufficient reaction, but the reaction time is greatly extended. In order to break through this limitation, domestic and foreign researchers have proposed a variety of solutions. Among them, on the one hand, the production capacity is increased by parallel replication and amplification of reactors, but this method directly leads to a surge in the number of equipment, which in turn brings high labor costs and maintenance pressure; on the other hand, microchemical technology is usually a continuous flow reaction, and most of the outlet pipelines are designed either above the reactor plane or on the same plane as the reactor, which can easily cause reactor blockage problems. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a micro mixer and method for continuously preparing nano cooling liquid. The structure can significantly improve the mixing efficiency of the micro reactor, the simple parallel scheme can greatly improve the production rate of the micro reactor, and the outlet plane is lower than the inlet plane, and the solid product is gathered to the outlet by gravity, avoiding the blockage problem in the flow channel, which is very suitable for the preparation of high-quality nano cooling liquid. The three-dimensional spiral flow channel design in the reaction chamber is folded in space, so that the overall size of the micro reactor will not be too large, and the flow channel curve is smooth. The most important thing is that the curved flow channel will produce secondary flow, which is called Dean vortex, which can enhance the mixing efficiency; the outlet size of each reaction flow channel can be controlled by the pressure regulating structure, thereby controlling the reaction pressure in the channel to achieve chemical reactions that require high-pressure reaction conditions.

[0006] The present invention solves the above technical problems through the following technical solutions.

[0007] One of the purposes of the present invention is to provide a micro mixer for continuously preparing nano-cooling liquid, comprising:

[0008] A reaction chamber is provided with at least two reaction channels, all of which are used to prepare nano-cooling liquids. Along the axial direction of the reaction chamber, all of the reaction channels are vertically arranged in the reaction chamber in a three-dimensional spiral shape. Each reaction channel is provided with a plurality of disturbance structures, and each disturbance structure is used to disturb, impact and mix the reaction fluid in a reaction channel.

[0009] A plurality of distributors are arranged in the reaction chamber and located above all the reaction channels, and each distributor is connected to the inlets of all the reaction channels.

[0010] The collector is arranged at the outlet of all reaction channels and is used to collect the coolant. A pressure regulating structure is arranged in the collector and is used to regulate the reaction pressure of all reaction channels.

[0011] Furthermore, the disturbance structures in each reaction channel are evenly distributed on the two inner walls of the reaction channel in an alternating manner.

[0012] Furthermore, all disturbance structures are inclined boat-shaped structures, the angle between the inclined boat-shaped structure and the inner wall of the reaction channel is 80° to 110°, and a plurality of flow holes are arranged at the lower end of the boat-shaped structure.

[0013] Furthermore, the pressure regulating structure includes a rotating disk, a fixed disk, a plurality of blades and an open slot. The rotating disk and the fixed disk are rotatably connected. The open slot is arranged on the fixed disk. One end of all the blades is connected to the rotating disk through a corresponding first limiting column, and the other end is slidably connected to the open slot through a corresponding second limiting column. The outer wall of the rotating disk is connected to the inner wall of the collector, the lower end of the collector passes through the inner wall of the reaction chamber, and the lower end of the collector is rotatably connected to the inner wall of the reaction chamber.

[0014] Furthermore, a heat exchange channel is provided between the reaction chamber and all reaction channels, a heat exchange inlet and a heat exchange outlet are provided on the reaction chamber, and the heat exchange inlet, the heat exchange outlet and the heat exchange channel are connected.

[0015] Furthermore, all distributors are arranged at equal intervals along the axial direction of the reaction chamber, each distributor is connected to all reaction channels through at least two inlet pipes, and each distributor is provided with a reaction liquid inlet, which passes through the reaction chamber.

[0016] Furthermore, all reaction channels are evenly distributed in a circle in the reaction chamber, and the cross section of each reaction channel includes a circle, a square, an ellipse or a triangle, and the cross-sectional diameter of all reaction channels is 0.005 mm to 5 mm.

[0017] The second object of the present invention is to provide a method for continuously preparing nano-cooling liquid, which is prepared by using the above-mentioned micro-mixer, comprising the following steps:

[0018] Along the axial direction of the reaction chamber, the reactant solution and the catalyst solution are respectively introduced into each distributor, and flow into the corresponding reaction channel through each distributor. The reactant solution and the catalyst solution react in the reaction channel to form a reaction fluid, and the reaction fluid in each corresponding reaction channel is disturbed, impacted and mixed by a disturbance structure to increase the mixed reaction efficiency, achieve consistent reaction conditions in each reaction channel, and obtain nano coolant. During the reaction, the reaction pressure of all reaction channels is adjusted by a pressure regulating structure, and finally collected by a collector.

[0019] Furthermore, the concentrations of the reactant solution and the catalyst solution are both 0.1 mol / L to 10 mol / L, the reactants in the reactant solution are tetraethyl silicate, tetrabutyl titanate, tetrabutyl zirconate, aluminum chloride hexahydrate or copper sulfate pentahydrate, and the catalyst in the catalyst solution is water, hydrochloric acid, sodium hydroxide or ascorbic acid.

[0020] Furthermore, the inlet flow rate of the reaction channel is 0.1 mL / min to 50 mL / min.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) The micro mixer for continuous preparation of nano-cooling liquid provided by the present invention adopts a distributor integrated distribution design, and flows into the corresponding reaction flow channel through the distributor, wherein all reaction flow channels are vertically arranged in the reaction chamber in a three-dimensional spiral shape along the axial direction of the reaction chamber, that is, the outlet plane of the reaction flow channel is lower than the inlet plane, and the use of gravity is conducive to the discharge of solid products in the reactor and avoids the blockage problem in the flow channel; the vertical three-dimensional spiral flow channel design in the reaction chamber is folded in space, so that the overall size of the microreactor will not be too large, and the flow channel curve is smooth. Most importantly, the curved flow channel will produce secondary flow, which is called Dean vortex, which can enhance mixing efficiency and reduce labor costs and maintenance pressure; and a disturbance structure is provided in the reaction flow channel to enhance fluid disturbance, which can further improve mixing efficiency. The outlet size of each reaction flow channel can be controlled by the pressure regulating structure, thereby controlling the reaction pressure in the channel to achieve chemical reactions requiring high-pressure reaction conditions.

[0023] (2) The disturbance structure provided by the present invention can increase the mutual collision of the reaction fluids by tilting the boat-shaped structure, thereby improving the mixing efficiency and promoting the reaction of the reaction fluids. The flow holes on the tilted boat-shaped structure can be used to form diversion drips on the reaction fluids, thereby increasing the mixing area of ​​the reaction fluids, making the reaction uniformity of the reaction fluids higher, and can effectively reduce the flow channel length and the overall volume of the microreactor, thereby improving the reaction efficiency.

[0024] (3) The present invention provides a heat exchange channel between the reaction chamber and all reaction channels, into which a heating / cooling medium can be introduced, thereby achieving control of the reaction temperature; each independent spiral microchannel is evenly distributed along the circumference in space, ensuring that the reaction conditions in the channel are consistent. By simply increasing the number of spiral channels, the output of the reactor can be increased.

[0025] (4) The present invention continuously prepares nanofluid coolants based on microreactors. The particle size of the prepared nanofluid coolants can be controllably adjusted by changing the inlet flow rate ratio of reactants and catalysts. The nanofluid coolant prepared by the one-step method has extremely high stability and can achieve long-term stability of more than 6 months without obvious agglomeration and sedimentation. According to actual cooling needs, the nanofluid coolant collected from the outlet can be directly used after dilution without generating additional waste, which meets the requirements of the sustainable development strategy. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The three-dimensional structure schematic diagram of the micro mixer used for continuously preparing nano-cooling liquid according to the present invention.

[0027] Figure 2 The schematic diagram of the front view of the micro mixer for continuously preparing nano-cooling liquid according to the present invention.

[0028] Figure 3 Schematic diagram of the flow line of the reaction channel of the present invention.

[0029] Figure 4 It is a structural schematic diagram of the disturbance structure of the present invention.

[0030] Figure 5 Schematic diagram of flow disturbance generated by the disturbance structure of the present invention.

[0031] Figure 6 It is a structural schematic diagram of the voltage regulating structure of the present invention.

[0032] Figure 7 This is a schematic diagram of the structure of a micro-mixer for continuously preparing nano-cooling liquid according to Example 1 or Example 2 of the present invention.

[0033] Figure 8 This is a schematic diagram of the structure of a micro-mixer for continuously preparing nano-cooling liquid according to Example 3 or Example 4 of the present invention.

[0034] Fig. 9 This is a physical picture of the silicon dioxide nano-cooling liquid prepared in Example 1 of the present invention.

[0035] Fig.10 This is a microstructure diagram of the silicon dioxide nano-coolant prepared in Example 1 of the present invention.

[0036] Fig.11 This is a physical picture of the titanium dioxide nano-coolant prepared in Example 2 of the present invention.

[0037] Fig.12 This is a microstructure diagram of the titanium dioxide nano-coolant prepared in Example 2 of the present invention.

[0038] Fig.13 This is a physical picture of the copper nano coolant prepared in Example 3 of the present invention.

[0039] Fig.14 This is a microstructure diagram of the copper nano-cooling liquid prepared in Example 3 of the present invention.

[0040] Fig.15 This is a physical picture of the boehmite nano-coolant prepared in Example 4 of the present invention.

[0041] Fig.16 This is a microstructure diagram of the boehmite nano-coolant prepared in Example 4 of the present invention.

[0042] Illustration Description:

[0043] 1. Reaction chamber, 2. Reaction flow channel, 3. Disturbance structure, 4. Distributor, 5. Collector, 6. Pressure regulating structure, 61. Rotating disk, 62. Fixed disk, 63. Blade, 64. Opening slot, 7. Heat exchange channel, 8. Inlet pipe. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0045] It should be noted that the professional terms used in the present invention are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of the present invention. Certain words are used in the present invention to refer to specific components. Those skilled in the art should understand that technicians will use different nouns to refer to the same component. The present invention does not distinguish between components by the difference in nouns, but by the difference in the functions of the components. As mentioned throughout the specification and claims, "including" is an open term and should be understood as "including but not limited to".

[0046] In one aspect, the present invention provides a micro mixer for continuously preparing nano-cooling liquid, such as Figure 1 to Figure 6 As shown, it includes: a reaction chamber 1, wherein a plurality of reaction channels 2 are arranged in the reaction chamber 1, all of which are used to prepare nano-cooling liquid, and along the axial direction of the reaction chamber 1, all of the reaction channels 2 are vertically arranged in the reaction chamber 1 in a three-dimensional spiral shape, and each of the reaction channels 2 is provided with a plurality of disturbance structures 3, and each of the disturbance structures 3 is used to disturb, impact and mix the reaction fluid in a reaction channel 2.

[0047] A plurality of distributors 4 are arranged in the reaction chamber 1 and located above all the reaction channels 2 . Each distributor 4 is connected to the inlets of all the reaction channels 2 .

[0048] The collector 5 is rotatably disposed at the outlets of all the reaction channels 2 for collecting the cooling liquid. A pressure regulating structure 6 is disposed inside the collector 5 for regulating the reaction pressure of all the reaction channels 2 .

[0049] The micro mixer for continuous preparation of nano-cooling liquid provided by the present invention adopts a distributor 4 integrated distribution design, and a pump is provided on the distributor 4. The liquid in the distributor 4 flows into the corresponding reaction channel 2, and the outlet plane is lower than the inlet plane. The gravity is used to facilitate the discharge of solid products in the reactor and avoid blockage problems in the channel. The three-dimensional spiral channel design in the reaction chamber 1 is folded in space, so that the overall size of the microreactor will not be too large, and the channel curve is smooth. Most importantly, the curved channel will produce secondary flow, which can mix the materials, which is called Dean vortex, and can enhance the mixing efficiency; and a disturbance structure 3 is provided in each reaction channel 2 to enhance fluid disturbance, which can further improve the mixing efficiency and the reaction efficiency. The outlet size of each reaction channel 2 can be controlled by the pressure regulating structure 6, thereby controlling the reaction pressure in the channel to achieve chemical reactions requiring high-pressure reaction conditions.

[0050] Among them, the number of distributors 4 is at least 2, and the distributors 4 are each provided with a delivery pump, through which the reaction liquid is delivered to the distributor 4. When the reaction liquid for preparing the nano-cooling liquid is two components, namely, a reactant solution and a catalyst solution, the number of distributors 4 is two. When the reaction raw materials for preparing the nano-cooling liquid are multi-component, the number of distributors 4 can be set according to the components of the reaction raw materials. At least two reaction channels 2 are provided in the reaction chamber 1, namely, a double-helix reaction channel, a triple-helix reaction channel, a quadruple-helix reaction channel, etc. Each reaction channel 2 contains at least two inlets and one outlet, all inlets and distributors 4 are in communication, and the reaction fluid flows to the inlet through the distributor 4 and flows out from the outlet from top to bottom along the spiral channel.

[0051] In some specific embodiments, the disturbance structures 3 in each reaction channel 2 are evenly distributed on the two inner walls of the reaction channel 2 in an alternating manner. All disturbance structures 3 are inclined boat-shaped structures, and the angle between the inclined boat-shaped structure and the inner wall of the reaction channel 2 is 80° to 110°, and a plurality of flow holes are provided at the lower end of the boat-shaped structure. The disturbance structure 3 provided by the present invention, the angle between the inclined boat-shaped structure and the inner wall of the reaction channel 2 can be any value between 80° and 110°, such as 80°, 90°, 100° or 110°, and the mutual collision of the reaction fluid can be increased by tilting the boat-shaped structure, thereby improving the mixing efficiency, prompting the reaction fluid to react, and the reaction fluid is formed into a diversion dripping mode through the flow holes on the inclined boat-shaped structure, thereby increasing the mixing area of ​​the reaction of the reaction fluid, making the reaction uniformity of the reaction fluid higher, and being able to effectively reduce the flow channel length and overall volume of the microreactor, and the reaction efficiency is higher.

[0052] In some specific embodiments, the pressure regulating structure 6 includes a rotating disk 61, a fixed disk 62, a plurality of blades 63 and an open slot 64. The rotating disk 61 and the fixed disk 62 are rotatably connected. The open slot 64 is provided on the fixed disk 62. One end of all blades 63 is connected to the rotating disk 61 through a corresponding first limiting column, and the other end is slidably connected to the open slot 64 through a corresponding second limiting column. The outer wall of the rotating disk 61 is connected to the inner wall of the collector 5, and the lower end of the collector 5 passes through the inner wall of the reaction chamber 1. The lower end of the collector 5 is rotatably connected to the inner wall of the reaction chamber 1. The rotating disk 61 is also provided with a plurality of third limiting columns, each of which is rotatably connected to the fixed disk 62 through the opening slot 64. The lower end of the collector 5 passes through the inner wall of the reaction chamber 1. A sealing ring is provided at the position of passing through, which is used to seal between the collector 5 and the reaction chamber 1 to prevent the heating / cooling medium in the reaction chamber 1 from flowing out. The lower end of the collector 5 is rotatably connected to the inner wall of the reaction chamber 1. When the rotating collector 5 passes through part, the rotating disk 61 rotates accordingly, and the corresponding second limiting column slides in the opening slot 64, driving the clutch of all the plates 63, thereby adjusting the size of the aperture at the opening of the collector 5, that is, the size of the aperture at the opening of the collector 5 is adjusted by an iris mechanism, and the maximum diameter is determined by the number of blades 63. When the number of blades 63 increases, the blades 63 can be deformed into strip blades; that is, the blades 63 include any one of arc blades and strip blades. For reactions that require high-pressure reaction conditions, the pressure regulating structure 6 at the opening of the collector 5 is adjusted to reduce the area at the outlet, thereby increasing the pressure in the flow channel, so as to achieve chemical reactions that require high-pressure reaction conditions.

[0053] In some specific embodiments, a heat exchange channel 7 is provided between the reaction chamber 1 and all the reaction channels 2, and a heat exchange inlet and a heat exchange outlet are provided on the reaction chamber 1, and the heat exchange inlet, the heat exchange outlet and the heat exchange channel 7 are connected. The heat exchange channel 7 is a cavity that can accommodate a heating / cooling medium, and a heating / cooling medium can be introduced through the heat exchange inlet and the heat exchange outlet to heat / cool the pipeline system, thereby realizing the control of the reaction temperature.

[0054] In some specific embodiments, all distributors 4 are arranged at equal intervals along the axial direction of the reaction chamber 1, and each distributor 4 is connected to all reaction channels 2 through at least two inlet pipes 8, and each distributor 4 is provided with a reaction liquid inlet, and the reaction liquid inlet passes through the reaction chamber 1. Each distributor 4 is connected to all reaction channels 2 through the inlet pipe 8, that is, when the reaction channel 2 is a double-helix reaction channel, each distributor 4 is provided with two inlet pipes 8, one of which is connected to one reaction channel 2, and the other is connected to another reaction channel 2, and different components are poured into each distributor 4, and then circulated to one reaction channel 2 for reaction.

[0055] In some specific embodiments, all reaction channels 2 are evenly distributed in a circle in the reaction chamber 1, and the cross-section of each reaction channel 2 includes a circle, a square, an ellipse or a triangle, and the cross-sectional diameter of all reaction channels 2 is 0.005 mm to 5 mm.

[0056] On the other hand, the present invention provides a method for continuously preparing nano-cooling liquid, which is prepared by using the above-mentioned micro mixer, such as Figure 1 to Figure 3 As shown, taking the case where the components of the nano coolant are formed by the reaction of two components as an example, the following steps are included:

[0057] S1. Prepare reactant solution and catalyst solution according to the needs of nanofluid.

[0058] S2. Along the axial direction of the reaction chamber 1, the reactant solution and the catalyst solution are respectively poured into the corresponding distributors 4, and the reactant solution and the catalyst solution in the two distributors 4 are circulated to all the reaction channels 2. The reactant solution and the catalyst solution react in the reaction channel 2 to form a reaction fluid, and the reaction fluid in each corresponding reaction channel 2 is disturbed, impacted and mixed by the disturbance structure 3. The inclined boat-shaped structure can increase the mutual collision of the reaction fluids, thereby improving the mixing efficiency, and promoting the reaction of the reaction fluid. The flow holes on the inclined boat-shaped structure are used to form a diversion and dripping method for the reaction fluid, thereby increasing the mixing area of ​​the reaction fluid reaction, making the reaction uniformity of the reaction fluid higher, increasing the mixing reaction efficiency, and achieving consistent reaction conditions in each reaction channel 2. During the reaction process, for reactions requiring high-pressure reaction conditions, the reaction pressure of all reaction channels 2 is adjusted by the pressure regulating structure 6 to obtain a nano coolant.

[0059] S3. For reactions requiring high temperature / low temperature reaction conditions, a heating / cooling medium may be introduced into the cavity between the reactor and the reaction channel 2 to increase / reduce the reaction temperature.

[0060] S4. Finally, the nano-cooling liquid is collected by the collector 5.

[0061] The concentration of the nanofluid is achieved by adjusting the concentration of the reactant solution and the catalyst solution. The reactant solution or the catalyst solution is a dispersion formed by dissolving the reactant or the catalyst in a dispersant. The types of dispersants include water, ethanol, ethylene glycol and fluorinated liquid. The particle size of the prepared nanofluid coolant can be controllably adjusted by changing the inlet flow rate ratio of the reactant and the catalyst. The inlet flow rate of the reaction channel 2 is 0.1mL / min to 50mL / min. In addition, the synthesis based on the microreactor is continuous and rapid. Therefore, the daily output of the nanofluid coolant can reach a maximum of hundreds to thousands of liters.

[0062] In some specific embodiments, the concentrations of the reactant solution and the catalyst solution are both 0.1 mol / L to 10 mol / L, the reactant in the reactant solution is tetraethyl silicate, tetrabutyl titanate, tetrabutyl zirconate or copper sulfate pentahydrate, and the catalyst in the catalyst solution is ammonia, hydrochloric acid, sodium hydroxide or ascorbic acid. The present invention is based on the continuous preparation of nanofluid coolant by microreactor, and the particle size of the prepared nanofluid coolant can be controllably adjusted by changing the inlet flow rate ratio of the reactant and the catalyst. The nanofluid coolant prepared by the one-step method has extremely high stability, can achieve long-term stability of more than 6 months, has no obvious agglomeration and sedimentation, and according to the actual cooling demand, the nanofluid coolant collected from the outlet can be directly used after dilution, without generating additional waste, and meets the requirements of the sustainable development strategy.

[0063] The invention is further described below through specific examples.

[0064] Example 1

[0065] The present invention provides a method for continuously preparing nano-cooling liquid using the above-mentioned micro-mixer, such as Figure 7 As shown, three reaction channels 2 are arranged in the reaction chamber 1, all the reaction channels 2 are three-dimensionally spirally evenly distributed in the reaction chamber 1, the cross section of each reaction channel 2 is a triangle, the cross-sectional diameter of all the reaction channels 2 is 5 mm, the disturbance structures 3 are all inclined boat-shaped structures, and the angle between the inclined boat-shaped structure and the inner wall of the reaction channel 2 is 80°; two distributors are arranged in the reaction chamber 1, and each distributor 4 is provided with three inlet pipes 8, wherein the first inlet pipe 8 is connected to one reaction channel 2, the second inlet pipe 8 is connected to another reaction channel 2, and the third inlet pipe 8 is connected to the last reaction channel 2.

[0066] The continuous preparation of nano-coolant comprises the following steps:

[0067] S1. According to the needs of nanofluid, the reactant tetraethyl silicate and the catalyst hydrochloric acid are dispersed in ethanol respectively to obtain a reactant solution and a catalyst solution, wherein the concentration of the reactant solution is 36 mmol / L, and the concentration of the catalyst solution is 1.5 mol / L.

[0068] S2. Along the axial direction of the reaction chamber 1, the reactant solution and the catalyst solution are respectively poured into a distributor 4, and the reactant solution and the catalyst solution in the two distributors 4 are passed into the corresponding reaction channel 2. The reaction fluid enters the reaction channel 2 at an inlet flow rate of 20 mL / min. The reaction fluid reacts in the reaction channel 2, and the disturbance structure 3 is used to disturb, impact and mix the reaction fluid in each corresponding reaction channel 2 to increase the mixing reaction efficiency, achieve consistent reaction conditions in each reaction channel 2, and obtain a nano coolant.

[0069] S4. Finally, 1 liter of ethanol-based silica nanofluid coolant is collected through the collector 5.

[0070] Fig. 9 This is a physical picture of the silicon dioxide nano-cooling liquid prepared in Example 1 of the present invention. Fig.10 This is a microstructure diagram of the silicon dioxide nano-coolant prepared in Example 1 of the present invention. Fig. 9 and Fig.10 As shown, the actual picture of 1 liter of the synthesized silica nano-cooling liquid and the scanning electron microscope picture of the silica nano-particles in the nano-cooling liquid, the synthesized silica nano-cooling liquid is transparent and clear, without obvious agglomeration and sedimentation, the silica nano-particles in the coolant are not agglomerated, and the particle size is uniform.

[0071] Example 2

[0072] The present invention provides a method for continuously preparing nano-cooling liquid using the above-mentioned micro-mixer, such as Figure 7 As shown, three reaction channels 2 are arranged in the reaction chamber 1, all the reaction channels 2 are three-dimensionally spirally evenly distributed in the reaction chamber 1, the cross section of each reaction channel 2 is a square, the cross-sectional diameter of all the reaction channels 2 is 1 mm, the disturbance structures 3 are all inclined boat-shaped structures, and the angle between the inclined boat-shaped structure and the inner wall of the reaction channel 2 is 95°; two distributors are arranged in the reaction chamber 1, each distributor 4 is provided with three inlet pipes 8, wherein the first inlet pipe 8 is connected to one reaction channel 2, the second inlet pipe 8 is connected to another reaction channel 2, and the third inlet pipe 8 is connected to the last reaction channel 2.

[0073] The continuous preparation of nano-coolant comprises the following steps:

[0074] S1. According to the needs of nanofluid, the reactant tetrabutyl titanate and the catalyst ammonia water are dispersed in ethanol respectively to obtain a reactant solution and a catalyst solution, wherein the concentration of the reactant solution is 36 mmol / L, and the concentration of the catalyst solution is 1.5 mol / L.

[0075] S2. Along the axial direction of the reaction chamber 1, the reactant solution and the catalyst solution are respectively poured into a distributor 4, and the reactant solution and the catalyst solution in the two distributors 4 are passed into the corresponding reaction channel 2. The reaction fluid enters the reaction channel 2 at an inlet flow rate of 20 mL / min. The reaction fluid reacts in the reaction channel 2, and the disturbance structure 3 is used to disturb, impact and mix the reaction fluid in each corresponding reaction channel 2 to increase the mixing reaction efficiency, achieve consistent reaction conditions in each reaction channel 2, and obtain a nano coolant.

[0076] S3. Finally, 1 liter of ethanol-based titanium dioxide nanofluid coolant is collected through the collector 5.

[0077] Fig.11 This is a physical picture of the titanium dioxide nano-cooling liquid prepared in Example 2 of the present invention. Fig.11 As shown, the titanium dioxide nano-coolant is white and translucent, with no obvious agglomeration and sedimentation. Fig.12 This is a microstructure diagram of the titanium dioxide nano-coolant prepared in Example 2 of the present invention. Fig.12 As shown, the titanium dioxide nanoparticles have no agglomeration and have uniform particle size.

[0078] Example 3

[0079] The present invention provides a method for continuously preparing nano-cooling liquid using the above-mentioned micro-mixer, such as Figure 8 As shown, four reaction channels 2 are arranged in the reaction chamber 1, all the reaction channels 2 are three-dimensional spirally evenly distributed in the reaction chamber 1, the cross section of each reaction channel 2 is a square, the cross-sectional diameter of all reaction channels 2 is 0.01 mm, and the disturbance structures 3 are all inclined boat-shaped structures, and the angle between the inclined boat-shaped structure and the inner wall of the reaction channel 2 is 100°; two distributors are arranged in the reaction chamber 1, and each distributor 4 is provided with three inlet pipes 8, wherein the first inlet pipe 8 is connected to one reaction channel 2, the second inlet pipe 8 is connected to another reaction channel 2, and the third inlet pipe 8 is connected to the last reaction channel 2.

[0080] The continuous preparation of nano-coolant comprises the following steps:

[0081] S1. According to the needs of nanofluid, the reactant copper sulfate pentahydrate and the catalyst ascorbic acid are dispersed in ethanol respectively to obtain a reactant solution and a catalyst solution, wherein the concentration of the reactant solution is 24 mmol / L, and the concentration of the catalyst solution is 3 mol / L.

[0082] S2. Along the axial direction of the reaction chamber 1, the reactant solution and the catalyst solution are respectively poured into a distributor 4, and the reactant solution and the catalyst solution in the two distributors 4 are passed into the corresponding reaction channel 2. The reaction fluid enters the reaction channel 2 at an inlet flow rate of 20 mL / min. The reaction fluid reacts in the reaction channel 2, and the disturbance structure 3 is used to disturb, impact and mix the reaction fluid in each corresponding reaction channel 2 to increase the mixing reaction efficiency, achieve consistent reaction conditions in each reaction channel 2, and obtain a nano coolant.

[0083] S4. Finally, 1 liter of ethylene glycol-based copper nanofluid coolant is collected through the collector 5.

[0084] Fig.13 This is a physical picture of the copper nano coolant prepared in Example 3 of the present invention. Fig.13As shown, the copper nano-coolant is brown-red and translucent, with no obvious agglomeration and sedimentation. Fig.14 This is a microstructure diagram of the copper nano-cooling liquid prepared in Example 3 of the present invention. Fig.14 As shown, the copper nanoparticles have no agglomeration and have uniform particle size.

[0085] Example 4

[0086] The present invention provides a method for continuously preparing nano-cooling liquid using the above-mentioned micro-mixer, such as Figure 8 As shown, four reaction channels 2 are arranged in the reaction chamber 1, all the reaction channels 2 are three-dimensionally spiral and are evenly distributed in the reaction chamber 1 in a circle, each reaction channel 2 has a square cross-section, and the cross-sectional diameter of all reaction channels 2 is 0.01 mm. The disturbance structures 3 are all inclined boat-shaped structures, and the angle between the inclined boat-shaped structure and the inner wall of the reaction channel 2 is 110°; two distributors are arranged in the reaction chamber 1, and each distributor 4 is provided with three inlet pipes 8, wherein the first inlet pipe 8 is connected to one reaction channel 2, the second inlet pipe 8 is connected to another reaction channel 2, and the third inlet pipe 8 is connected to the last reaction channel 2.

[0087] The continuous preparation of nano-coolant comprises the following steps:

[0088] S1. According to the needs of nanofluid, the reactant aluminum chloride hexahydrate and the catalyst ammonia water are dispersed in ethanol respectively to obtain a reactant solution and a catalyst solution, wherein the concentration of the reactant solution is 40 mmol / L, and the concentration of the catalyst solution is 0.5 mol / L.

[0089] S2. Along the axial direction of the reaction chamber 1, the reactant solution and the catalyst solution are respectively poured into a distributor 4, and the reactant solution and the catalyst solution in the two distributors 4 are passed into the corresponding reaction channel 2. The reaction fluid enters the reaction channel 2 at an inlet flow rate of 20 mL / min. The reaction fluid reacts in the reaction channel 2, and the disturbance structure 3 disturbs, impacts and mixes the reaction fluid in each corresponding reaction channel 2 to increase the mixed reaction efficiency, achieve consistent reaction conditions in each reaction channel 2, and obtain nano coolant. During the reaction process, for reactions requiring high-pressure reaction conditions, the reaction pressure of all reaction channels 2 is adjusted by the pressure regulating structure 6, and the pressure in the channel is adjusted to 0.35 MPa by rotating the outlet part of the collector 5.

[0090] S3. For reactions requiring high temperature / low temperature reaction conditions, a heating / cooling medium can be introduced into the cavity between the reactor and the reaction channel 2 to increase / decrease the temperature of the reaction. Heated dimethyl silicone oil is introduced into the cavity to heat the channel to 135°C.

[0091] S4. Finally, 1 liter of water-based boehmite nanofluid coolant is collected through the collector 5.

[0092] Fig.15 This is a physical picture of the boehmite nano-coolant prepared in Example 4 of the present invention. Fig.15 As shown, the boehmite nano-coolant is white and translucent, without obvious agglomeration and sedimentation. Fig.16 This is a microstructure diagram of the boehmite nano-coolant prepared in Example 4 of the present invention. Fig.15 As shown, the boehmite nanoparticles have no agglomeration and have uniform particle size.

[0093] It should be noted that when the present invention involves a numerical range, it should be understood that the two endpoints of each numerical range and any value between the two endpoints can be selected. Since the steps and methods used are the same as those in the embodiments, in order to avoid redundancy, the present invention describes a preferred embodiment. Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they know the basic creative concept. Therefore, the attached claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0094] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A micro mixer for continuous preparation of nano-cooling liquid, characterized in that: include: A reaction chamber (1), wherein at least two reaction channels (2) are arranged in the reaction chamber (1), all the reaction channels (2) are used to prepare nano-cooling liquid, and along the axial direction of the reaction chamber (1), all the reaction channels (2) are vertically arranged in the reaction chamber (1) in a three-dimensional spiral shape, and each reaction channel (2) is provided with a plurality of disturbance structures (3), and each disturbance structure (3) is used to perform a disturbance, collision and mixing function on a reaction fluid in a reaction channel (2); A plurality of distributors (4) are arranged in the reaction chamber (1) and located above all the reaction channels (2), and each distributor (4) is connected to the inlet of all the reaction channels (2); The collector (5) is rotatably arranged at the outlets of all reaction channels (2) and is used to collect cooling liquid. A pressure regulating structure (6) is arranged in the collector (5) and is used to regulate the reaction pressure of all reaction channels (2).

2. The micro mixer for continuous preparation of nano-cooling liquid according to claim 1, characterized in that: The disturbance structures (3) in each reaction channel (2) are evenly distributed in an alternating manner on the two inner walls of the reaction channel (2).

3. The micro mixer for continuous preparation of nano-cooling liquid according to claim 1, characterized in that: All disturbance structures (3) are inclined boat-shaped structures, the angle between the inclined boat-shaped structure and the inner wall of the reaction flow channel (2) is 80° to 110°, and a plurality of flow holes are arranged at the lower end of the boat-shaped structure.

4. The micro mixer for continuous preparation of nano-cooling liquid according to claim 1, characterized in that: The pressure regulating structure (6) comprises a rotating disk (61), a fixed disk (62), a plurality of blades (63) and an open slot (64); the rotating disk (61) and the fixed disk (62) are rotatably connected; the open slot (64) is arranged on the fixed disk (62); one end of all blades (63) is connected to the rotating disk (61) through a corresponding first limiting column, and the other end is slidably connected to the open slot (64) through a corresponding second limiting column; the outer wall of the rotating disk (61) is connected to the inner wall of the collector (5); the lower end of the collector (5) passes through the inner wall of the reaction chamber (1); and the lower end of the collector (5) is rotatably connected to the inner wall of the reaction chamber (1).

5. The micro mixer for continuous preparation of nano-cooling liquid according to claim 1, characterized in that: A heat exchange channel (7) is provided between the reaction chamber (1) and all reaction channels (2); a heat exchange inlet and a heat exchange outlet are provided on the reaction chamber (1); and the heat exchange inlet, the heat exchange outlet and the heat exchange channel (7) are in communication.

6. The micro mixer for continuous preparation of nano-cooling liquid according to claim 1, characterized in that: All distributors (4) are arranged at equal intervals along the axial direction of the reaction chamber (1); each distributor (4) is connected to all reaction channels (2) via at least two inlet pipes (8); and each distributor (4) is provided with a reaction liquid inlet, which passes through the reaction chamber (1).

7. The micro mixer for continuous preparation of nano-cooling liquid according to claim 1, characterized in that: All reaction channels (2) are evenly distributed in a circle in the reaction chamber (1); the cross section of each reaction channel (2) includes a circle, a square, an ellipse or a triangle; and the cross section diameter of all reaction channels (2) is 0.005 mm to 5 mm.

8. A method for continuously preparing nano-cooling liquid, characterized in that: The method is prepared by using the micromixer according to any one of claims 1 to 7, comprising the following steps: Along the axial direction of the reaction chamber (1), the reactant solution and the catalyst solution are respectively introduced into each distributor (4), and circulated into all the reaction channels (2) through each distributor (4). The reactant solution and the catalyst solution react in the reaction channel (2) to form a reaction fluid, and the reaction fluid in each corresponding reaction channel (2) is disturbed, impacted and mixed by a disturbance structure (3), thereby increasing the efficiency of the mixed reaction and achieving the same reaction conditions in each reaction channel (2). During the reaction process, the reaction pressure of all the reaction channels (2) is adjusted by a pressure regulating structure (6), and finally the solution is collected by a collector (5) to obtain a nano-cooling liquid.

9. The method for continuously preparing nano-cooling liquid according to claim 8, characterized in that: The concentrations of the reactant solution and the catalyst solution are both 0.1 mol / L to 10 mol / L, the reactant in the reactant solution is tetraethyl silicate, tetrabutyl titanate, tetrabutyl zirconate or copper sulfate pentahydrate, and the catalyst in the catalyst solution is ammonia water, hydrochloric acid, sodium hydroxide or ascorbic acid.

10. The method for continuously preparing nano-cooling liquid according to claim 8, characterized in that: The inlet flow rate of the reaction channel (2) is 0.1 mL / min to 50 mL / min.

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