Continuous flow reactor and heating method

Abstract

The application discloses a kind of continuous flow reactor and heating method, belong to microwave technical field, including reactor pipe body, two circular waveguides and super material body;The reactor pipe body extends along left and right directions;The reactor pipe body left and right ends are respectively equipped with microwave feed inlet;Two The circular waveguide is respectively connected to the microwave feed inlet of the reactor pipe body;The inner wall of the circular waveguide is equipped with super material body;The thickness of the super material body gradually increases from the direction of reactor pipe body away to close to reactor pipe body, and the thickness of super material body close to the end of reactor pipe body is equal to the thickness of reactor pipe body;Material channel is formed in the reactor pipe body;The material channel is used to pass material;The microwave transmitted in the circular waveguide is fed into the material channel.The application can effectively improve the problems that microwave heating device cannot realize efficient and stable heating for large range dielectric material when carrying out continuous flow material microwave heating.

Description

Technical Field

[0001] This invention relates to the field of microwave technology, specifically to a continuous flow reactor and a heating method. Background Technology

[0002] Microwave heating, due to its advantages such as high speed, timely control, selective heating, high efficiency, and cleanliness, is now widely used in food processing, chemical industry, and pharmaceutical fields for heating continuous flow materials. It also has important applications in promoting organic chemical reactions, such as esterification and the iodination of acetone. Esterification is a crucial reaction for biodiesel production, and studying the heating effect of microwaves on esterification is significant for subsequent biodiesel production. The iodination of acetone exhibits a significant dielectric change and is often used to study chemical kinetics.

[0003] In existing technologies, continuous flow reactors are typically used to heat continuously flowing materials. However, traditional continuous flow reactors cannot provide stable auxiliary effects for a wide range of chemical reactions; furthermore, during chemical reactions, the dielectric properties of the reactants often change, leading to a reduction in microwave heating efficiency. Therefore, traditional microwave heating cannot achieve stable and efficient heating of materials with a wide range of dielectric properties. Summary of the Invention

[0004] To address the problems existing in the prior art, this invention provides a continuous flow reactor and heating method, aiming to solve the problem that existing continuous flow reactors cannot achieve efficient and stable heating of a wide range of dielectric materials. To achieve the above objective, this invention provides the following technical solution:

[0005] A continuous flow reactor includes a reactor tube, two circular waveguides, and a metamaterial body. The reactor tube extends in a left-right direction. Microwave feed inlets are located at both ends of the reactor tube. The two circular waveguides are connected to the microwave feed inlets of the reactor tube. The metamaterial body is wound around the inner wall of each circular waveguide. The thickness of the metamaterial body gradually increases from the direction away from the reactor tube to the direction closer to the reactor tube, and the thickness of the metamaterial body at the end closer to the reactor tube is equal to the thickness of the reactor tube. A material channel is formed within the reactor tube. The material channel is used for material passage. Microwaves transmitted within the circular waveguides are fed into the material channel.

[0006] Furthermore, the length of the metamaterial body is consistent with the length of the circular waveguide; the cross-section of the metamaterial body is a right trapezoid.

[0007] Furthermore, the material channel is a material flow pipe; the reactor tube body is provided with a cavity; the material flow pipe is disposed in the cavity; the reactor tube body is provided with a material inlet and a material outlet; the material inlet, the material flow pipe and the material outlet correspond to each other to form a material channel.

[0008] Furthermore, the material flow pipe is spirally arranged along the axis of the reactor tube; the cross-section of the material flow pipe is rectangular.

[0009] Furthermore, it also includes a microwave solid-state source, a waveguide-coaxial converter, a circulator, a load, a directional coupler, a microwave power meter, and a waveguide adapter; the microwave solid-state source, the waveguide-coaxial converter, the circulator, the directional coupler, the waveguide adapter, and the circular waveguide are connected in sequence; the circulator is connected to the load; and the directional coupler is connected to the microwave power meter.

[0010] A heating method for a continuous flow reactor, comprising the aforementioned continuous flow reactor, wherein microwaves are fed into a circular waveguide; the microwaves transmitted within the circular waveguide are fed into a material channel; and the continuous flow material passes through the material channel at a uniform speed.

[0011] The beneficial effects of this invention are:

[0012] 1. This invention achieves non-reciprocal transmission in a circular waveguide by designing a wedge-shaped metamaterial body in the circular waveguide. Compared with ordinary circular waveguides, non-reciprocal transmission circular waveguides have very low reflection and high microwave energy utilization.

[0013] 2. This invention is based on a non-reciprocal transmission circular waveguide design for a continuous flow reactor, which can achieve efficient heating of a wide range of dielectric materials, thus overcoming the shortcomings of traditional continuous flow reactors;

[0014] 3. The continuous flow reactor of the present invention has a compact structure, which effectively avoids the influence of the continuous flow reactor material on microwave transmission. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a continuous flow reactor according to an embodiment of the present invention;

[0016] Figure 2 This is a front view of a continuous flow reactor according to an embodiment of the present invention;

[0017] Figure 3 This is a rear view of a continuous flow reactor according to an embodiment of the present invention;

[0018] Figure 4 This is a cross-sectional view of a continuous flow reactor according to an embodiment of the present invention;

[0019] Figure 5This is a schematic diagram of the electromagnetic wave propagation path of the planar plate metamaterial described in an embodiment of the present invention;

[0020] Figure 6 This is an electric field distribution diagram of microwave propagation in the forward and reverse directions along a non-reciprocal circular waveguide, as described in an embodiment of the present invention.

[0021] Figure 7 This is a schematic diagram of the non-reciprocal circular waveguide model described in an embodiment of the present invention;

[0022] Figure 8 The figure shows the experimental results of the effect of the thickness of the left and right ends of the reactor tube on the heating effect.

[0023] Figure 9 This is a graph showing the experimental results of the effect of the relative permittivity of the reactor tube on the heating effect.

[0024] Figure 10 This is a graph showing the experimental results of the effect of the relative permittivity of the material flow pipe of this invention on the heating effect;

[0025] Figure 11 This is a graph showing the experimental results of the effect of the material thickness of the material flow pipe on the heating effect according to the present invention;

[0026] Figure 12 This is a graph showing the experimental results of the effect of the pipe opening size of the material flow pipe of the present invention on the heating effect;

[0027] Figure 13 This is a graph showing the experimental results of the effect of the number of turns in the material flow pipe on the heating effect according to the present invention;

[0028] Figure 14 This is a graph showing the experimental results of the effect of fluid dielectric change on system heating efficiency according to the present invention;

[0029] Figure 15 This is a graph showing the experimental results of heating efficiency of ethanol solutions of different concentrations according to the present invention;

[0030] Figure 16 This is a graph showing the experimental results of the effect of different flow rates of the esterification reaction on the heating efficiency in the embodiments of the present invention;

[0031] Figure 17 This is a graph showing the experimental results of the effect of different rates of acetone iodination reaction on heating efficiency in the embodiments of the present invention.

[0032] In the attached diagram: 1-reactor tube, 2-circular waveguide, 3-metamaterial body, 4-material flow tube, 5-material inlet, 6-material outlet, 8-waveguide coaxial converter, 9-circulator, 10-load, 11-directional coupler, 12-microwave power meter, 13-waveguide adapter. Detailed Implementation

[0033] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, but the present invention is not limited to the following embodiments.

[0034] Example 1:

[0035] See attached Figure 1-17 A continuous flow reactor includes a reactor tube 1, two circular waveguides 2, and a metamaterial body 3. The reactor tube 1 extends in a left-right direction. Microwave feed inlets are respectively provided at both ends of the reactor tube 1. The two circular waveguides 2 are respectively connected to the microwave feed inlets of the reactor tube 1. The metamaterial body 3 is wound around the inner wall of the circular waveguides 2. The thickness of the metamaterial body 3 gradually increases from away from the reactor tube 1 to near the reactor tube 1, and the thickness of the metamaterial body 3 near the reactor tube 1 is equal to the thickness of the reactor tube 1. A material channel is formed inside the reactor tube 1. The material channel is used for material passage. Microwaves transmitted in the circular waveguides 2 are fed into the material channel. As can be seen from the above structure, the present invention relates to a continuous flow reactor, such as... Figure 1 , Figure 2 and Figure 3 As shown, the reactor includes a reactor tube 1, two circular waveguides 2, and a metamaterial body 3. The reactor tube 1 is used to heat a continuous flow of material. The reactor tube 1 is horizontally positioned and extends in the left-right direction. Microwave inlets are located at both the left and right ends of the reactor tube 1, allowing microwaves to be fed in. Circular waveguides 2 are connected to the left and right ends of the reactor tube 1, respectively. A metamaterial body 3 is wound around the inner wall of each circular waveguide 2. The thickness of the metamaterial body 3 gradually increases from the direction away from the reactor tube 1 to the direction closer to the reactor tube 1, and the thickness of the metamaterial body 3 at the end closer to the reactor tube 1 is equal to the thickness of the reactor tube 1. Figure 4 As shown, two circular waveguides 2 and a metamaterial body 3 within the circular waveguides 2 are symmetrically arranged at the left and right ends of the reactor tube 1. The circular waveguides 2 can be connected to a microwave source, which can be an existing solid-state source. The microwaves generated by the microwave source are fed into the circular waveguides 2. Because the circular waveguides 2 contain a metamaterial body 3 with a material thickness that gradually increases from the distance from the reactor tube 1 to the distance from the reactor tube 1, non-reciprocal circular waveguide models are formed at the left and right ends of the reactor tube 1. According to the existing non-reciprocal transmission principle, after the microwave propagates forward from the non-reciprocal circular waveguides 2, when it reaches the metasurface of the metamaterial body 3, its reflection angle is greater than the incident angle. After multiple reflections, the microwave will be parallel to the central axis of the circular waveguides 2, thus becoming a surface wave. For microwaves incident in the opposite direction, their reflection angle is smaller than the incident angle. After multiple reflections, the microwave will be refracted back. The electric field distributions of the forward and reverse propagation of the circular waveguides 2 are shown below. Figure 6As shown, microwaves propagating in the forward direction can travel through the non-reciprocal circular waveguide 2, while microwaves propagating in the reverse direction cannot reach the non-reciprocal circular waveguide 2. Simulation experiments show that at an operating frequency of 2.45 GHz, the reflection coefficient S11 of the forward propagation is less than -10 dB, and the reflection coefficient S11 of the reverse propagation is close to 0 dB, meeting the standard for non-reciprocal propagation. Simulation experiments demonstrate the feasibility of the non-reciprocal circular waveguide 2, enabling unidirectional microwave transmission. Therefore, microwaves generated by the microwave source are forward-fed into two non-reciprocal circular waveguides 2 symmetrically arranged at both ends of the reactor tube 1. After being converted into surface waves by the non-reciprocal circular waveguides 2, they are then transmitted through the reactor tube 1 to the material channel within the reactor tube 1, achieving efficient heating of the continuous flow of material within the material channel.

[0036] Among them, the law of reflection was proposed by Snell, which states that when a beam of light strikes an interface, the angles formed by the incident ray and the reflected ray with the normal are the same. Light is a type of electromagnetic wave, and the law of reflection also applies to electromagnetic waves of other frequency bands. According to Snell's law of reflection, after an electromagnetic wave is incident on the interface, the angle of reflection is equal to the angle of incidence, as shown in formula (1).

[0037] θ i =θ r (1)

[0038] k1sinθ i =k2sinθ r (2)

[0039] Where, θ i θ r Here, k1 and k2 are the angle of incidence and the angle of reflection, respectively, and k1 and k2 are the refractive indices of the two media. Snell's law of refraction states that the angle of refraction is related to the angle of incidence and the wavenumbers of the two regions, as shown in formula (2). The wavenumber can be equivalent to the refractive index; therefore, it is generally said that the angle of refraction is related to the angle of incidence and the refractive indices of the two media. With the addition of a metamaterial with a gradient refractive index, the propagation of electromagnetic waves will no longer follow the traditional Snell's law of reflection, but will follow the generalized law of refraction. When the refractive index of the metasurface increases along the z-axis, it has a phase gradient on the z-axis, and the reflected wave will be as follows: Figure 5 As shown by the solid lines in the diagram, for an electromagnetic wave incident on the left, after it reaches the metasurface, its reflection angle is greater than the incident angle. After multiple reflections, the electromagnetic wave will be parallel to the z-axis, thus becoming a surface wave. For an electromagnetic wave incident on the right, its reflection angle is smaller than the incident angle. After multiple reflections, the electromagnetic wave will be reflected back.

[0040] Example 2:

[0041] See attached Figure 1-17Based on Embodiment 1, the length of the metamaterial body 3 is consistent with the length of the circular waveguide 2; the cross-section of the metamaterial body 3 is a right trapezoid. As can be seen from the above structure, by winding the metamaterial body 3 around the inner wall of the circular waveguide 2, the thickness of the metamaterial body 3 gradually increases from the direction away from the reactor tube 1 to the direction closer to the reactor tube 1. This ensures that the microwaves generated by the microwave source are positively fed into the two non-reciprocal circular waveguides 2 symmetrically arranged at the left and right ends of the reactor tube 1, and then converted into surface waves by the non-reciprocal circular waveguides 2. These waves are then transmitted through the reactor tube 1 to the material flow pipe 4 located inside the reactor tube 1, achieving efficient heating of the continuous flow within the material flow pipe 4. However, materials with continuously varying dielectric constants are often difficult to obtain. Therefore, this invention approximates the continuous variation of the dielectric constant of the metamaterial body 3 along the electromagnetic wave propagation direction by changing the volume ratio of the lossless medium to air in a periodic structure of the waveguide. Figure 7 As shown, the equivalent dielectric constant varies depending on the ratio of air to the dielectric medium. Specifically, ε... r Let be the dielectric constant of the medium, and the dielectric constant of air is 1. The length of the metamaterial body 3 in this invention is consistent with the length of the circular waveguide 2, and it is wound around the inner wall of the circular waveguide 2 of the metamaterial body 3. The cross-section of the metamaterial body 3 is a right-angled trapezoid, as shown below. Figure 7 As shown. This invention achieves non-reciprocal transmission in a circular waveguide by designing a wedge-shaped metamaterial body within the waveguide. Compared to ordinary circular waveguides, non-reciprocal transmission circular waveguides exhibit very low reflection and high microwave energy utilization.

[0042] The material channel is a material flow pipe 4; the reactor tube 1 has a cavity; the material flow pipe 4 is disposed within the cavity; the reactor tube 1 has a material inlet 5 and a material outlet 6; the material inlet 5, the material flow pipe 4, and the material outlet 6 correspond to each other, forming a material channel. From the above structure, it can be seen that the reactor tube 1 is used to heat a continuous flow of material. The reactor tube 1 has a cavity, and the material flow pipe 4 is disposed within the cavity. Therefore, the reactor tube 1 and the material flow pipe 4 constitute a structure for heating a continuous flow of material. To facilitate the inflow and outflow of the continuous flow of material, a material inlet 5 and a material outlet 6 are provided on the reactor tube 1. The material flow pipe 4 is used for the continuous passage of material; therefore, the material flow pipe 4 is a hollow structure. The material inlet 5, the material flow pipe 4, and the material outlet 6 correspond to each other, forming a material flow channel. When the continuous flow of material is heated, it flows into the material flow pipe 4 through the material inlet 5, is efficiently heated by microwaves in the material flow pipe 4, and the heated continuous flow of material flows out from the material outlet 6. A Coriolis flow meter can also be used to keep the continuous flow of material moving at a constant speed, so that it is heated evenly in the material flow pipe 4.

[0043] The material flow pipe 4 is spirally arranged along the axis of the reactor tube 1; the cross-section of the material flow pipe 4 is rectangular. As can be seen from the above structure, the material flow pipe 4 is used for the continuous passage of material, and it is located within the reactor tube 1. The material flow pipe 4 can be made of microwave-transparent material. When microwaves are transmitted to the reactor tube 1, they penetrate the microwave-transparent material material flow pipe 4 to heat the continuous flow of material within it. Simultaneously, to make the continuous flow reactor structure more compact and further improve heating efficiency, the material flow pipe 4 is spirally arranged along the axis of the reactor tube 1, and its cross-section is rectangular.

[0044] The system also includes a microwave solid-state source, a waveguide-coaxial converter 8, a circulator 9, a load 10, a directional coupler 11, a microwave power meter 12, and a waveguide adapter 13. The microwave solid-state source, waveguide-coaxial converter 8, circulator 9, directional coupler 11, waveguide adapter 13, and circular waveguide 2 are connected sequentially. The circulator 9 is connected to the load 10. The directional coupler 11 is connected to the microwave power meter 12. From the above structure, it can be seen that microwaves are excited by the microwave solid-state source, fed into the waveguide-coaxial converter 8, then transmitted through the circulator 9 to the directional coupler 11, and finally transmitted through the waveguide adapter 13 to the circular waveguide 2. The circulator 9 is connected to the load 10, for example, a water load, which absorbs reflected microwaves and protects the microwave solid-state source. The directional coupler 11 is connected to the microwave power meter 12, which can be used to detect the system's energy utilization rate. The reactor tube 1 has symmetrical structures at both ends. Therefore, there are two waveguide coaxial converters 8, circulators 9, loads 10, directional couplers 11, microwave power meters 12, and waveguide adapters 13. There can be one or two microwave solid-state sources.

[0045] Example 3:

[0046] See attached Figure 1-17 Based on Example 2, a continuous flow reactor heating method is provided, employing the aforementioned continuous flow reactor, where microwaves are fed into a circular waveguide 2; the microwaves transmitted within the circular waveguide 2 are then fed into a material channel; the continuous flow material passes through the material channel at a uniform speed. As can be seen from the above structure, when heating the continuous flow material using the aforementioned continuous flow reactor, firstly, a microwave solid-state source is turned on, and microwaves are input from the microwave source. The microwaves are converted into surface waves through the non-reciprocal transmission circular waveguide 2. Microwave reflection within the non-reciprocal transmission circular waveguide 2 is minimal, resulting in high microwave energy utilization. The continuous flow material enters the material flow pipe 4 through the material inlet 5, is heated within the material flow pipe 4, and finally flows out from the material outlet 6. The continuous flow material can maintain a uniform speed of movement within the continuous flow reactor, enabling more uniform heating.

[0047] Based on the above-mentioned heating method for a continuous flow reactor, a traditional continuous flow reactor and the continuous flow reactor of this invention were simulated in simulation software. The traditional method was used, that is, without setting the metamaterial body 3 inside the circular waveguide 2. The input frequency of the microwave source was 2.45 GHz, the circular waveguide 2 was a C25 circular waveguide, and the overall length of the circular waveguide 2 was 260 mm; the relative permittivity of the metamaterial body 3 was 20, and the dimensions of the metamaterial body were d = 10 mm and d0 = 0.5 mm; the overall length L of the reactor tube 1 was 201 mm, and the relative permittivity was 20; the thickness of the left and right ends of the reactor tube 1 was H; the material flow pipe 4 was 3D printed, and its material had a dielectric constant of 3.4 and 10 turns; W is the width of the material flow pipe 4, d1 is the thickness of the material of the material flow pipe 4, and L1 is the length of the material flow pipe 4.

[0048] Comparative Experiment 1:

[0049] To verify the robustness of the continuous flow reactor of the present invention, a series of simulation experiments were conducted.

[0050] a. The effect of the thickness H at both ends of the reactor tube 1 on the heating effect.

[0051] like Figure 8 As shown, Figure 8 The effect of the thickness H at both ends of the reactor tube 1 on the heating effect of the entire system is demonstrated. Compared with conventional methods, the heating system of this invention exhibits good robustness and heating efficiency when the thickness H at both ends of the reactor tube 1 is changed.

[0052] b. The effect of the relative permittivity of reactor tube 1 on the heating effect.

[0053] like Figure 9 As shown, Figure 9 The effect of the dielectric properties of the reactor tube 1 material on the heating effect of the entire system is demonstrated. Compared with conventional methods, the heating efficiency of this invention is consistently maintained above 85%, and reaches its optimum at a relative permittivity of 20.

[0054] c. The effect of the relative permittivity of the material flow pipe 4 on the heating effect.

[0055] like Figure 10 As shown, Figure 10 The effect of the dielectric properties of the material in the material flow pipe 4 on the heating effect of the entire system is demonstrated. Compared with traditional heating systems, the heating efficiency of this invention remains above 95%, and it exhibits good robustness. The heating efficiency of traditional heating systems is low, far lower than that of this invention.

[0056] d. The effect of the size of the material flow pipe on the heating effect.

[0057] like Figure 11 and Figure 12 As shown, Figure 11 , Figure 12 The effect of the size of the material flow pipe 4 on the heating system is demonstrated. Different sizes of material flow pipe 4 have little impact on the heating efficiency of the present invention, but have a greater impact on the conventional heating system.

[0058] e. The effect of the number of turns in the material flow pipe on the heating effect.

[0059] like Figure 13 As shown, Figure 13 The invention demonstrates the effect of the number of turns in the material flow pipe on the heating system. The invention maintains a heating efficiency of over 90% under different numbers of turns, while the efficiency of traditional heating systems is less than 70% and has poor robustness.

[0060] Comparative Experiment 2:

[0061] To verify the heating efficiency of the continuous flow reactor of this invention, a series of simulation experiments were conducted to discuss the influence of the dielectric properties of the continuous flow material on the heating efficiency. For example... Figure 14 As shown, Figure 14 This invention demonstrates that, under a wide range of dielectric fluid conditions, the heating efficiency of the fluid remains above 85%, while the heating efficiency of conventional heating systems is below 70%.

[0062] Ethanol solutions of different concentrations have different dielectrics and are often used as wide-range dielectric solutions to verify the robustness of heating systems. Table 1 shows the dielectric parameters of 0%-100% concentration ethanol solutions.

[0063] Table 1. Relative permittivity of ethanol at different concentrations

[0064]

[0065] The microwave power of the solid-state source is 50W, such as... Figure 15 As shown, Figure 15 The heating efficiency of ethanol solutions with different concentrations was tested, and the experimental results demonstrate that the heating efficiency for a wide range of dielectric fluids is above 85%. This result proves that the present invention can still achieve efficient heating under a wide range of dynamic dielectric fluids, providing a new approach for the industrial application of microwave heating.

[0066] Comparative Experiment 3:

[0067] The heating effect of a continuous flow reactor on chemical reactions was further discussed.

[0068] f. Esterification reaction.

[0069] Esterification is the process by which biodiesel is produced. Studying the effect of microwave heating on the esterification reaction is of great significance for subsequent biodiesel production. For example... Figure 16 As shown, Figure 16 The heating efficiency of this invention and a conventional heating system is demonstrated when the material inlet 5 has a flow rate of 0.10 m / s, 0.15 m / s, and 0.2 m / s. At different flow rates, the equilibrium time for the chemical reaction varies, as does the change in dielectric constant. Figure 16 The invention demonstrates that it can achieve highly efficient heating of the esterification reaction at different flow rates, with an efficiency exceeding 90%. Traditional heating systems have low efficiency, only around 65%.

[0070] g. Acetone iodination reaction.

[0071] The iodination of acetone involves a significant dielectric change and is often used as a reaction in the study of chemical kinetics. For example... Figure 17 As shown, Figure 17 The system heating effect at different flow rates was demonstrated. This invention enables highly efficient heating of the iodination reaction. Compared with traditional heating systems, it exhibits excellent energy utilization. This invention solves the problem of microwaves being unable to heat a wide range of dielectric liquids by using a non-reciprocal transmission waveguide, enabling highly efficient heating of various chemical reactions.

[0072] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A continuous flow reactor characterized by: It includes reactor tube body (1), two circular waveguides (2) and super material body (3), the reactor tube body (1) extends along left and right directions, the reactor tube body (1) is respectively provided with microwave feed inlet at left and right ends, two circular waveguides (2) are respectively connected to the microwave feed inlet of the reactor tube body (1), the inner wall of the circular waveguide (2) is provided with super material body (3), the axial length of the super material body (3) is consistent with the length of the circular waveguide (2), the thickness of the super material body (3) gradually increases from the direction away from the reactor tube body (1) to the direction close to the reactor tube body (1), and the thickness of the super material body (3) close to one end of the reactor tube body (1) is equal to the thickness of the reactor tube body (1), the reactor tube body (1) is formed with material channel, the material channel is used for passing material, and the microwave transmitted in the circular waveguide (2) is fed into the material channel. The material channel is material flow pipe (4), the reactor tube body (1) is provided with cavity, the material flow pipe (4) is arranged in the cavity, the reactor tube body (1) is provided with material inlet (5) and material outlet (6), the material inlet (5), the material flow pipe (4) and the material outlet (6) correspond to each other. The material flow pipe (4) is spirally arranged along the axis of the reactor tube body (1), and the cross section of the material flow pipe (4) is rectangular.

2. A continuous flow reactor according to claim 1, wherein: The cross section of the super material body (3) is right trapezoidal.

3. A continuous flow reactor according to claim 1, wherein: It also includes microwave solid source, waveguide coaxial converter (8), circulator (9), load (10), directional coupler (11), microwave power meter (12) and waveguide adapter (13), the microwave solid source, waveguide coaxial converter (8), circulator (9), directional coupler (11), waveguide adapter (13) and circular waveguide (2) are sequentially connected, the circulator (9) is connected with load (10), and the directional coupler (11) is connected with microwave power meter (12).

4. A continuous flow reactor heating method, characterized by: The continuous flow reactor is used, the microwave is fed into the circular waveguide (2), the microwave transmitted in the circular waveguide (2) is fed into the material channel, and the continuous flow material passes through the material channel at a constant speed.

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