Continuous microchannel reaction system containing multiple temperature zones and temperature control method

Abstract

The invention relates to the field of microchannel reaction, in particular to a continuous microchannel reaction system containing multiple temperature zones and a temperature control method. The system comprises a water tank, a plurality of temperature change assemblies and micro-channel reactors in one-to-one correspondence with the temperature change assemblies, and the water tank is provided with a heating piece; the temperature change assembly comprises a heat conduction column, a water outlet main pipe and a plurality of winding metal pipes which are sequentially wound on the heat conduction column from bottom to top; the lower end opening of the lowermost winding metal pipe is communicated with a water tank through a water pump; the adjacent winding metal pipes are connected through a metal pipe water inlet valve; an upper end opening of each winding metal pipe is connected with a water outlet main pipe through a water outlet valve; the micro-channel pipelines of the micro-channel reactors are sequentially connected through liquid discharge valves; the inlet of the water bath layer of each micro-channel reactor is communicated with the corresponding water outlet header pipe, and the outlet is communicated with the water tank. According to the invention, independent heat exchange can be carried out on a plurality of micro-channel reactors participating in continuous reactions according to the requirements of different reactions and different stages, so that the reactions can be carried out safely and efficiently.

Description

Technical Field

[0001] The invention relates to the technical field of microchannel reaction, and in particular to a continuous microchannel reaction system containing multiple temperature zones and a temperature control method. Background Art

[0002] A microchannel reactor is a three-dimensional structural element that can be used for chemical reactions and is made of a solid matrix using special micromachining technology. Microchannel reactors usually have channels of smaller size and diverse shapes, in which fluids flow and the required reactions occur. Microchannel reactors have a very large specific surface area in microstructured chemical equipment, and compared to reactors, microchannel reactors have better heat and mass transfer capabilities.

[0003] During the reaction process, multiple microchannel reactors are sometimes used for the reaction. The reaction is carried out in the previous microchannel reactor, and the product obtained enters the next microchannel reactor to continue the reaction as a reactant. The reaction temperature requirements of each microchannel reactor are also different.

[0004] Moreover, exothermic reactions are a very common type of reaction. Timely heat exchange in these reactions affects the reaction effect of the entire reaction and may even pose a major safety hazard. Currently, many exothermic reactions involve a large amount of heat released during the reaction, which causes the reaction temperature to soar, directly affecting the reaction effect of the entire reaction. If the reaction heat cannot be controlled in time, it will cause safety issues such as explosions.

[0005] Therefore, it is urgent to design a continuous microchannel reaction system with multiple temperature zones to meet the heat exchange requirements of multiple microchannel reactors at different stages and ensure the safe and efficient progress of the reaction. Summary of the invention

[0006] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a continuous microchannel reaction system with multiple temperature zones, which can independently exchange heat for multiple microchannel reactors participating in the continuous reaction according to the needs of different reactions and different stages, thereby ensuring safe and efficient reactions.

[0007] In order to solve the above technical problems, the technical solution of the present invention is: a continuous microchannel reaction system with multiple temperature zones, comprising a water tank, a plurality of temperature modification components, and a plurality of microchannel reactors, wherein the water tank is equipped with a heating element, and each microchannel reactor corresponds to a temperature modification component; wherein,

[0008] Each temperature modification component includes a heat-conducting column, a water outlet main pipe and a plurality of winding metal pipes, wherein the plurality of winding metal pipes are wound on the heat-conducting column in sequence from bottom to top; the lower end opening of the lowest winding metal pipe is connected to the water tank through a water pump; adjacent winding metal pipes are connected through metal pipe water inlet valves; the upper end opening of each winding metal pipe is also connected to the water outlet main pipe through a water outlet valve;

[0009] The microchannel pipelines of each microchannel reactor are connected in sequence through a drain valve; the water inlet of the water bath layer of each microchannel reactor is connected to the water outlet main pipe of the corresponding temperature modification component, and the water outlet is connected to the water tank through a return pipe;

[0010] The temperature modification component is configured to adjust the temperature of water held in a water bath entering a corresponding microchannel reactor through a water outlet main pipe by adjusting the number of wound metal pipes put into use, so as to heat or dissipate heat for the corresponding microchannel pipeline.

[0011] In order to ensure the stability of the outlet water temperature and to block impurities and precipitation, the water tank is fixed with a first partition and a second partition from left to right, dividing the water tank from left to right into a heating area, a water passing area and a water outlet area; wherein,

[0012] The upper end of the first partition is connected to the water tank, and there is a gap between the lower end and the water tank;

[0013] The lower end of the second partition is connected to the water tank, and a gap is left between the upper end and the water tank;

[0014] The heating element is installed in the heating zone, and the lower end opening of the lowest winding metal tube of each temperature modification component is directly connected to the water outlet zone through a water inlet pipe equipped with the water pump, and the return pipe is directly connected to the heating zone.

[0015] In order to further enable the temperature modification component to dissipate heat better, each temperature modification component also includes a temperature modification component placement box and a heat exchange plate. The heat conductive column is installed in the temperature modification component placement box, the heat exchange plate is installed on the corresponding heat conductive column, and the part extending out of the temperature modification component placement box is configured with cooling fins.

[0016] In order to further save floor space and enable each heat dissipation column to dissipate heat evenly, each heat-conducting column is stacked in sequence from bottom to top, and a heat insulation board is arranged between adjacent heat-conducting columns.

[0017] In order to facilitate the transfer of materials within each microchannel reactor and save space, the microchannel reactors are arranged in sequence in the upper and lower directions. In two adjacent microchannel reactors, the lower end opening of the upper microchannel pipeline is connected to the upper end opening of the lower microchannel pipeline through a drainage pipe equipped with the drainage valve.

[0018] To facilitate the introduction of new reactants into each microchannel pipeline, the upper end opening of the top microchannel pipeline and the drainage pipeline are respectively connected to a liquid inlet pipeline, or each microchannel pipeline is respectively connected to a liquid inlet pipeline; the liquid inlet pipeline is equipped with a liquid inlet valve.

[0019] To further facilitate the discharge of the final product, the lower end opening of the lowest microchannel pipeline is connected to a final discharge pipeline, and the final discharge pipeline is equipped with a final discharge valve.

[0020] In order to place the water pumps in an orderly manner and facilitate heat dissipation, the continuous microchannel reaction system with multiple temperature zones also includes a water pump placement box, which is provided with multiple layers, each layer is equipped with a water pump, and each layer is provided with air holes.

[0021] The present invention also provides a temperature control method for a continuous microchannel reaction containing multiple temperature zones based on a continuous microchannel reaction system containing multiple temperature zones, the method comprising:

[0022] The reactants react in the microchannel pipelines of each microchannel reactor in turn, and the product in the previous microchannel pipeline serves as the reactant in the next microchannel pipeline;

[0023] Adjust the opening and closing states of the water inlet valves and the water outlet valves of the metal pipes on the corresponding temperature modification components, so that the water in the water tank enters the water bath layer of the corresponding microchannel reactor after passing through the corresponding number of winding metal pipes under the pumping of the corresponding water pump, and adjusts the temperature in the corresponding microchannel pipeline;

[0024] Wherein, for each microchannel reactor:

[0025] Before the reaction starts and / or at the initial stage of the reaction, water in the water tank is pumped by a corresponding water pump through a small number of wound metal pipes and then enters the water bath layer of the microchannel reactor, heating the microchannel pipeline to a preset reaction temperature;

[0026] If an exothermic reaction is taking place in the microchannel pipeline, the water in the water tank is pumped by a corresponding water pump through a large number of wound metal pipes and then enters the water bath layer of the microchannel reactor, so that the microchannel pipeline maintains a preset reaction temperature.

[0027] After adopting the above technical solution, the present invention has the following beneficial effects:

[0028] 1. The present invention is equipped with a plurality of microchannel reactors connected in sequence, and the product in the previous microchannel reactor can easily enter the next microchannel reactor to participate in the reaction as a reactant. Therefore, the present invention can easily carry out continuous reactions. In addition, the present invention independently controls the temperature of the microchannel reactor through a temperature modification component corresponding to the microchannel reactor, ensuring that the system has multiple temperature zones, and each microchannel reactor can be at its required reaction temperature, ensuring that the reaction is carried out efficiently.

[0029] 2. Before the reaction starts or at the initial stage of the reaction, the hot water in the water tank can enter the temperature change component and pass through fewer winding metal tubes or even no winding metal tubes to keep as little heat loss as possible, enter the water bath layer of the corresponding microchannel reactor at a higher temperature, and heat the microchannel pipeline of the microchannel reactor in a water bath so that the microchannel pipeline reaches the required reaction temperature as soon as possible to ensure efficient reaction; after the reaction is carried out normally, if the microchannel pipeline is an exothermic reaction, the hot water in the water tank can enter the temperature change component and pass through more winding metal tubes to keep as much heat loss as possible, and enter the water bath layer of the microchannel reactor at a lower temperature, thereby taking away the heat of the microchannel pipeline of the microchannel reactor, so that the microchannel reactor can still maintain the most suitable temperature when carrying out an exothermic reaction, greatly improving the reaction efficiency, and avoiding the safety hazards caused by the temperature soaring due to the large amount of heat released during the reaction, thereby ensuring the safety of the reaction. Therefore, the present invention can independently exchange heat for multiple microchannel reactors participating in the continuous reaction according to the needs of different reactions and different stages, and ensure safe and efficient reactions.

[0030] 3. Most of the microchannel reactors carry out exothermic reactions. Each microchannel reactor is put into use and reacts in sequence. The heat generated during the reaction of the previous microchannel reactor is taken away by the water in the water bath layer and returned to the water tank through the return pipe. Therefore, the heat generated by the reaction in the previous microchannel reactor can be used to heat the next microchannel reactor before or at the beginning of the reaction, thereby saving energy. In addition, the water in the water tank is recycled. Therefore, the operating cost of the entire device is low and it is easy to promote and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is an axial structural schematic diagram of a continuous microchannel reaction system with multiple temperature zones of the present invention;

[0032] Figure 2 for Figure 1 A cross-sectional view of

[0033] Figure 3 A cross-sectional view of a housing box for multiple temperature-changing components of the present invention;

[0034] Figure 4 for Figure 3 A cross-sectional view of the bottom temperature change component placement box;

[0035] Figure 5 for Figure 4 A magnified view of part A;

[0036] Figure 6 is a cross-sectional view of a plurality of microchannel reactors of the present invention;

[0037] Figure 7 for Figure 6 A magnified view of part B;

[0038] Figure 8 It is a cross-sectional view of a water pump placement box of the present invention;

[0039] In the figure, 1. water tank; 2. microchannel reactor; 21. microchannel pipeline; 3. heat conducting column; 4. water outlet main pipe; 5. winding metal pipe; 6. water inlet pipe; 7. water pump; 8. metal pipe water inlet valve; 9. water outlet branch pipe; 10. water outlet valve; 11. drainage pipe; 12. drainage valve; 13. return pipe; 14. first partition; 15. second partition; 16. heating zone; 17. water passing zone; 18. water outlet zone; 19. temperature change component placement box; 20. heat exchange plate; 21. heat dissipation fin; 22. heat insulation board; 23. liquid inlet pipe; 24. liquid inlet valve; 25. final discharge pipe; 26. final discharge valve; 27. water pump placement box; 28. air hole; 29. ​​heating element. DETAILED DESCRIPTION

[0040] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments in conjunction with the accompanying drawings.

[0041] Embodiment 1

[0042] like Figures 1 to 8 As shown, a continuous microchannel reaction system with multiple temperature zones includes a water tank 1, a plurality of temperature modification components, and a plurality of microchannel reactors 2. The water tank 1 is provided with a heating element 29, and each microchannel reactor 2 corresponds to a temperature modification component; wherein,

[0043] Each temperature modification component includes a heat-conducting column 3, a water outlet main pipe 4 and a plurality of winding metal pipes 5, which are wound around the heat-conducting column 3 from bottom to top and connected in sequence; the lower end opening of the lowest winding metal pipe 5 is connected to the water tank 1 through a water inlet pipe 6, and a water pump 7 is arranged on the water inlet pipe 6; a metal pipe water inlet valve 8 is arranged between adjacent winding metal pipes 5; the upper end opening of each winding metal pipe 5 is also connected to the water outlet main pipe 4 through a water outlet branch pipe 9, and each water outlet branch pipe 9 is equipped with a water outlet valve 10;

[0044] The microchannel pipelines 21 of each microchannel reactor 2 are connected in sequence through a drainage pipe 11, and a drainage valve 12 is arranged on the drainage pipe 11; the water inlet of the water bath layer of each microchannel reactor 2 is connected to the water outlet main pipe 4 of the corresponding temperature change component, and the water outlet is connected to the water tank 1 through a return pipe 13;

[0045] The temperature modification component is configured to adjust the temperature of the water in the water bath clamped by the corresponding microchannel reactor 2 through the outlet main pipe 4 by adjusting the number of the wound metal tubes 5 put into use, so as to heat or dissipate the corresponding microchannel pipeline 21.

[0046] In this embodiment, when it is necessary to heat the microchannel pipeline 21, in order to minimize the heat loss at the temperature change component, considering that water flows from bottom to top in each wound metal tube 5, the lower end opening of the lowest wound metal tube 5 can also be connected to the water outlet main pipe 4 through a water outlet branch pipe 9 equipped with a water outlet valve 10, and a metal tube water inlet valve 8 is also arranged at a position slightly above the water outlet main pipe 4. In this way, by closing the metal tube water inlet valve 8 and opening the water outlet valve 10, the water pumped by the water pump 7 can directly reach the water outlet main pipe 4 at the temperature change component without passing through any wound metal tube 5, thereby minimizing heat loss.

[0047] Specifically, this embodiment is configured with a plurality of microchannel reactors 2 connected in sequence, and the microchannel reactor 2 is independently temperature-controlled by a temperature modification component corresponding to the microchannel reactor 2, thereby ensuring that the system has multiple temperature zones and each microchannel reactor can be at its required reaction temperature, thereby ensuring efficient reaction. Before the reaction starts or in the early stage of the reaction, the hot water in the water tank 1 can enter the temperature change component and pass through fewer winding metal tubes 5 or even no winding metal tubes 5 to keep as little heat loss as possible, enter the water bath layer of the corresponding microchannel reactor 2 at a higher temperature, and heat the microchannel pipeline 21 of the microchannel reactor 2 in a water bath so that the microchannel pipeline reaches the required reaction temperature as soon as possible to ensure efficient reaction; after the reaction proceeds normally, if the microchannel pipeline 21 is an exothermic reaction, the hot water in the water tank 1 can enter the temperature change component and pass through more winding metal tubes 5 to keep as much heat loss as possible, and enter the water bath layer of the microchannel reactor 2 at a lower temperature, thereby taking away the heat of the microchannel pipeline 21 of the microchannel reactor 2, so that the microchannel reactor 2 can still maintain the most suitable temperature when performing an exothermic reaction, greatly improving the reaction efficiency, and avoiding the safety hazards caused by the temperature surge caused by the large amount of heat released during the reaction, thereby ensuring the safety of the reaction. In addition, most of the microchannel reactors 2 carry out exothermic reactions, and each microchannel reactor 2 is put into use and reacts in sequence. The heat generated during the reaction of the previous microchannel reactor 2 is taken away by the water in the water bath layer and returned to the water tank 1 through the return pipe 13. Therefore, the heat generated by the reaction in the previous microchannel reactor 2 can be used to heat the next microchannel reactor 2 before the reaction of the next microchannel reactor 2 or at the initial stage of the reaction, thereby saving energy consumption. In addition, the water in the water tank 1 is recycled. Therefore, the operating cost of the entire device is low and it is easy to promote and use.

[0048] In addition, in this embodiment, the water tank 1, each water outlet main pipe 4, and each microchannel reactor 2 are equipped with a temperature sensor, and each valve is an electric valve. The controller is simultaneously connected to the heating element 29, each temperature sensor, and each electric valve, and controls the operation of the heating element 29 according to the temperature feedback from the corresponding temperature sensor, and determines the number of wound metal tubes 5 put into use in each temperature modification component, and controls the opening and closing of each electric valve according to the number of wound metal tubes 5 put into use.

[0049] The more the number of wound metal tubes 5 is put into use, the larger the surface area in contact with the heat-conducting column 3 is, and the more the temperature is reduced. Figure 1 , Figure 2 In the example shown, three temperature modification components and three microchannel reactors 2 are respectively configured, and the metal tube water inlet valve 8 at the upper end opening of the wound metal tube 5 is located above the water outlet valve 10. Take one of the temperature modification components as an example: if only one wound metal tube 5 is needed for use, the water outlet valve 10 at the upper end opening of the lowest wound metal tube 5 will be opened, and the metal tube water inlet valve 8 between the lowest wound metal tube 5 and the wound metal tube 5 above it will be closed; if two wound metal tubes 5 are needed for use, for the first wound metal tube 5 from bottom to top, the water outlet valve 10 at its upper end opening will be closed, and the metal tube water inlet valve 8 at its upper end opening will be opened; for the second wound metal tube from bottom to top, the water outlet valve 10 at its upper end opening will be opened, and the metal tube water inlet valve 8 at its upper end opening will be closed.

[0050] In this embodiment, if Figure 2 and Figure 3 As shown, the heat-conducting columns 3 can be stacked in sequence from bottom to top, and a heat-insulating plate 22 is disposed between adjacent heat-conducting columns 3 .

[0051] Such an arrangement can save floor space on the one hand, and can prevent heat transfer and temperature interference between adjacent heat-conducting columns as much as possible on the other hand, thereby more accurately controlling the water temperature in each water outlet main pipe 4.

[0052] In this embodiment, if Figure 1 , Figure 2 and Figure 6 As shown, each microchannel reactor 2 is arranged in sequence in the up-down direction. In two adjacent microchannel reactors 2 , the lower end opening of the upper microchannel pipeline 21 is connected to the upper end opening of the lower microchannel pipeline 21 through a drainage pipeline 11 .

[0053] Such an arrangement can save floor space on the one hand, and facilitate the transfer of materials in adjacent microchannel reactors 2 on the other hand, so that the product in the previous microchannel reactor 2 can enter the next microchannel reactor 2 more smoothly and participate in the reaction as a reactant.

[0054] In this embodiment, if Figure 2 , Figure 6 and Figure 7 As shown, the upper end opening of the topmost microchannel pipeline 21 and the liquid discharge pipeline 11 are respectively connected to the liquid inlet pipeline 23, or each microchannel pipeline 21 is respectively connected to the liquid inlet pipeline;

[0055] The liquid inlet pipeline 23 is provided with a liquid inlet valve 24 .

[0056] In this way, reactants, catalysts, etc. can be easily added into the microchannel pipeline 21 as needed.

[0057] In this embodiment, if Figure 1 , Figure 2 and Figure 6 As shown, the lower end opening of the lowest microchannel pipeline 21 is connected to a final discharge pipeline 25 , and the final discharge pipeline 25 is provided with a final discharge valve 26 .

[0058] In this way, it is convenient to discharge the final reaction product.

[0059] In this embodiment, if Figure 1 , Figure 2 and Figure 8 As shown, the continuous microchannel reaction system with multiple temperature zones also includes a water pump placement box 27. The water pump 7 installation box is provided with multiple layers, each layer is equipped with a water pump 7, and each layer is provided with air holes 28.

[0060] In this way, the orderly installation and arrangement of multiple water pumps 7 are facilitated, and heat can be dissipated quickly.

[0061] Embodiment 2

[0062] Based on the first embodiment, Figure 2 As shown, a first partition 14 and a second partition 15 are fixedly connected in sequence from left to right in the water tank 1, dividing the water tank 1 from left to right into a heating area 16, a water passing area 17 and a water outlet area 18; wherein,

[0063] The upper end of the first partition 14 is connected to the water tank 1, and there is a gap between the lower end and the water tank 1; the lower end of the second partition 15 is connected to the water tank 1, and there is a gap between the upper end and the water tank 1;

[0064] The heating element 29 is installed in the heating area 16 , the water inlet pipe 6 is directly connected to the water outlet area 18 , and the water return pipe 13 is directly connected to the heating area 16 .

[0065] Specifically, the water in the water tank 1 reaches the water passing area 17 and the water outlet area in turn along the S-shaped self-heating area 16, and finally enters the water inlet pipe 6. In this way, the temperature of the water entering the water inlet pipe 6 can be guaranteed to be stable, and it can also play a certain degree of blocking effect on impurities, precipitation, etc. in the water tank 1, avoiding blockage of the water bath layer wrapped around the metal tube 5 and the microchannel reactor 2.

[0066] Embodiment 3

[0067] On the basis of Example 1 or Example 2, Figure 2 , Figure 3 and Figure 4 As shown, each temperature modification component further includes a temperature modification component placement box 19 and a heat exchange plate 20. The heat-conducting column 3 is installed in the temperature modification component placement box 19. The heat exchange plate 20 is installed on the corresponding heat-conducting column 3, and the portion extending out of the temperature modification component placement box 19 is provided with a heat dissipation fin 21. In addition, a heat insulation plate 22 can also be provided between the top of the uppermost heat-conducting column 3 and the temperature modification component placement box 19 to reduce the heat transfer between the heat-conducting column 3 and the temperature modification component placement box 19.

[0068] Specifically, a temperature modification component placement box 19 is provided. On the one hand, it can ensure that each temperature modification component is arranged and installed in an orderly manner. On the other hand, it can play an insulating role. The heat on the heat-conducting column 3 is transferred to the outside of the temperature modification component installation box 19 through the heat exchange plate 20 and the heat dissipation fins 21, thereby preventing the heat emitted by the heat-conducting column 3 from affecting the temperature of the wound metal tube 5 in turn.

[0069] In addition, a heat recovery device or heat storage device can be set outside the temperature modification component placement box 19. This part of heat can be used to heat the next microchannel reactor 2, and can also be used to evaporate and purify the final product, further saving energy consumption.

[0070] Embodiment 4

[0071] A method for controlling temperature of a continuous microchannel reaction containing multiple temperature zones based on the continuous microchannel reaction system containing multiple temperature zones of Embodiment 1, Embodiment 2 or Embodiment 3, the method comprising:

[0072] The reactants react in the microchannel pipelines 21 of each microchannel reactor 2 in sequence, and the product in the previous microchannel pipeline 21 serves as the reactant in the next microchannel pipeline 21;

[0073] Adjust the opening and closing states of the metal pipe water inlet valves 8 and the water outlet valves 10 on the corresponding temperature modification components, so that the water in the water tank 1 enters the water bath layer of the corresponding microchannel reactor 2 after passing through the corresponding number of winding metal pipes 5 under the pumping of the corresponding water pump 7, and adjusts the temperature in the corresponding microchannel pipeline 21;

[0074] Wherein, for each microchannel reactor 2:

[0075] Before the reaction starts and / or at the initial stage of the reaction, the water in the water tank 1 is pumped by the corresponding water pump 7 through a small number of wound metal tubes 5 and then enters the water bath layer of the microchannel reactor 2, and the microchannel pipeline 21 is heated to a preset reaction temperature;

[0076] If an exothermic reaction is taking place in the microchannel pipeline 21, the water in the water tank 1 is pumped by the corresponding water pump 7 and passes through a larger number of wound metal tubes 5 before entering the water bath layer of the microchannel reactor 2, so that the microchannel pipeline 21 maintains a preset reaction temperature.

[0077] It should be noted that if the microchannel reaction pipeline 21 still needs to be heated during the normal reaction process, the water in the water tank 1 can also enter the water bath layer of the microchannel reactor 2 after being pumped by the corresponding water pump 7 through a small number of winding metal tubes 5 (which can be zero), so as to heat the microchannel reaction pipeline 21.

[0078] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A continuous microchannel reaction system with multiple temperature zones, characterized in that: It comprises a water tank (1), a plurality of temperature modification components, and a plurality of microchannel reactors (2), wherein the water tank (1) is provided with a heating element (29), and each microchannel reactor (2) corresponds to a temperature modification component; wherein: Each temperature modification component comprises a heat-conducting column (3), a water outlet main pipe (4) and a plurality of winding metal pipes (5), wherein the plurality of winding metal pipes (5) are wound around the heat-conducting column (3) in sequence from bottom to top; the lower end opening of the lowest winding metal pipe (5) is connected to the water tank (1) via a water pump (7); adjacent winding metal pipes (5) are connected via a metal pipe water inlet valve (8); and the upper end opening of each winding metal pipe (5) is also connected to the water outlet main pipe (4) via a water outlet valve (10); The microchannel pipelines (21) of the various microchannel reactors (2) are connected in sequence via a liquid discharge valve (12); the water inlet of the water bath layer of each microchannel reactor (2) is connected to the water outlet main pipe (4) of the corresponding temperature modification component, and the water outlet is connected to the water tank (1) via a return pipe (13); The temperature modification component is configured to adjust the temperature of the water in the water bath clamped by the corresponding microchannel reactor (2) through the outlet main pipe (4) by adjusting the number of wound metal pipes (5) put into use, so as to heat or dissipate heat for the corresponding microchannel pipeline (21).

2. The continuous microchannel reaction system with multiple temperature zones according to claim 1, characterized in that: A first partition (14) and a second partition (15) are fixedly connected in sequence from left to right in the water tank (1), dividing the water tank (1) from left to right into a heating area (16), a water passing area (17) and a water outlet area (18); wherein: The upper end of the first partition (14) is connected to the water tank (1), and a gap is left between the lower end and the water tank (1); the lower end of the second partition (15) is connected to the water tank (1), and a gap is left between the upper end and the water tank (1); The heating element (29) is installed in the heating zone (16), and the lower end opening of the winding metal tube (5) at the bottom of each temperature change component is directly connected to the water outlet zone (18) through a water inlet pipe (6) equipped with the water pump (7), and the return pipe (13) is directly connected to the heating zone (16).

3. The continuous microchannel reaction system with multiple temperature zones according to claim 1, characterized in that: Each temperature modification component further comprises a temperature modification component placement box (19) and a heat exchange plate (20); the heat conductive column (3) is installed in the temperature modification component placement box (19); the heat exchange plate (20) is installed on the corresponding heat conductive column (3); and the portion extending out of the temperature modification component placement box (19) is provided with heat dissipation fins (21).

4. The continuous microchannel reaction system with multiple temperature zones according to claim 1, characterized in that: The heat-conducting columns (3) are stacked in sequence from bottom to top, and a heat-insulating plate (22) is arranged between adjacent heat-conducting columns (3).

5. The continuous microchannel reaction system with multiple temperature zones according to claim 1, characterized in that: The microchannel reactors (2) are arranged in sequence in the vertical direction. In two adjacent microchannel reactors (2), the lower end opening of the upper microchannel pipeline (21) is connected to the upper end opening of the lower microchannel pipeline (21) via a discharge pipe (11) equipped with the discharge valve (12).

6. The continuous microchannel reaction system with multiple temperature zones according to claim 5, characterized in that: The upper end opening of the uppermost microchannel pipeline (21) and the liquid discharge pipeline (11) are respectively connected to a liquid inlet pipeline (23), or the upper end opening of each microchannel pipeline (21) is respectively connected to a liquid inlet pipeline; The liquid inlet pipeline (23) is provided with a liquid inlet valve (24).

7. The continuous microchannel reaction system with multiple temperature zones according to claim 5, characterized in that: The lower end opening of the lowest microchannel pipeline (21) is connected to a final discharge pipeline (25), and the final discharge pipeline (25) is provided with a final discharge valve (26).

8. The continuous microchannel reaction system with multiple temperature zones according to claim 1, characterized in that: It also comprises a water pump placement box (27), wherein the water pump (7) installation box is provided with multiple layers, each layer is provided with a water pump (7), and each layer is provided with air holes (28).

9. A temperature control method for a continuous microchannel reaction with multiple temperature zones based on the continuous microchannel reaction system with multiple temperature zones according to any one of claims 1 to 8, characterized in that: Methods include: The reactants react in the microchannel pipelines (21) of each microchannel reactor (2) in sequence, and the product in the previous microchannel pipeline (21) is used as the reactant in the next microchannel pipeline (21); Adjusting the opening and closing states of the metal pipe water inlet valves (8) and water outlet valves (10) on the corresponding temperature modification assembly, so that the water in the water tank (1) enters the water bath layer of the corresponding microchannel reactor (2) after passing through a corresponding number of wound metal pipes (5) under the pumping of the corresponding water pump (7), thereby adjusting the temperature in the corresponding microchannel pipeline (21); Wherein, for each microchannel reactor (2): Before the reaction starts and / or at the initial stage of the reaction, water in the water tank (1) is pumped by a corresponding water pump (7) through a small number of wound metal pipes (5) and then enters the water bath layer of the microchannel reactor (2), thereby heating the microchannel pipeline (21) to a preset reaction temperature; If an exothermic reaction is taking place in the microchannel pipeline (21), the water in the water tank (1) is pumped by a corresponding water pump (7) and passes through a large number of wound metal tubes (5) before entering the water bath layer of the microchannel reactor (2), so that the microchannel pipeline (21) maintains a preset reaction temperature.

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