A triple-jacketed-heat-pipe millimeter channel reactor and its use method

Abstract

The application discloses a triple-tube heat-pipe millimeter channel reactor and a use method thereof, and the reactor comprises an evaporation section and a condensation section; the evaporation section adopts a coaxial triple-tube structure to form an inner annular gap and an outer annular gap; the condensation section comprises a second inner tube and a plurality of large fins arranged in a slanting radial manner; the second inner tube is communicated with the first inner tube, and the outer annular gap is communicated with the inside of the large fins; the outer wall of the second inner tube is provided with first small fins, and the outer wall of the large fins is provided with second small fins. The design significantly increases the heat exchange area and improves the rapid heat removal capacity through the triple-tube structure and the multi-stage fins; meanwhile, the millimeter-level channel size makes the processing fluid volume large and effectively prevents the blockage of high-viscosity or solid-containing reaction systems. The application effectively solves the problems of high risk of thermal runaway, easy blockage and low heat removal efficiency of the existing sleeve pipe micro-channel reactor in the strong exothermic reactions such as nitration, chlorination, diazotization and sulfonation.

Description

Technical Field

[0001] This invention belongs to the field of millimeter channel reactor technology, and relates to a three-tube-heat pipe millimeter channel reactor and its usage method. Background Technology

[0002] Millimeter-channel reactors are an important branch of continuous flow chemistry and process intensification. As a mesoscale reactor that lies between traditional macroscopic reactors (such as batch and tubular reactors) and microscale microchannel reactors, it aims to balance reaction performance and engineering feasibility, and is regarded as a key technological path to achieve a smooth transition from laboratory results to industrial production.

[0003] While microchannel reactors excel in mass and heat transfer, their sub-millimeter-scale channels often face challenges during industrial scale-up, including clogging, high manufacturing precision requirements, large system pressure drop, and limited throughput per unit time. Millimeter-channel reactors were developed to address these challenges. Their design retains the core advantages of continuous flow technology: excellent specific surface area, precise residence time control, high single-channel fluid throughput, superior thermal management, and intrinsic safety. Simultaneously, by appropriately increasing the channel size, they significantly improve system robustness, the ability to handle solids or highly viscous materials, ease of manufacturing, and the production throughput per unit.

[0004] Millimeter channels, through the construction of specific flow channel geometries, can achieve highly efficient mixing in laminar or transitional flow conditions. Their mass transfer coefficient is far higher than that of traditional stirred tank reactors, allowing reactants to achieve molecular-scale mixing within seconds or even milliseconds, thereby effectively suppressing side reactions and improving reaction selectivity and yield. Simultaneously, the large specific surface area results in extremely high heat exchange efficiency, rapidly removing heat released by strongly exothermic reactions and enabling precise control of the reaction temperature, which is crucial for many temperature-sensitive rapid reactions.

[0005] Compared to traditional double- or triple-tube heat exchange methods, heat pipes have a greater latent heat of phase change than sensible heat, resulting in better heat exchange performance. Inert particles are added to the evaporation section, enhancing its heat transfer capacity. Fins in the condensation section increase the heat transfer area, further improving condensation heat transfer. Summary of the Invention

[0006] To address the problems existing in the prior art, the present invention provides a three-tube-heat pipe millimeter channel reactor and its usage method, thereby solving the technical problems of high risk of thermal runaway, easy blockage of high viscosity / solid-liquid mixtures, and poor heat exchange efficiency of the tube reactor in the prior art when performing strongly exothermic reactions such as nitration, chlorination, diazotization, and sulfonation.

[0007] This invention is achieved through the following technical solution: A three-tube-heat-pipe millimeter-channel reactor includes an evaporation section and a condensation section; The evaporation section includes a first inner tube, a middle tube, and an outer tube coaxially sleeved from the inside out; an inner annular gap is formed between the first inner tube and the middle tube; and an outer annular gap is formed between the middle tube and the outer tube. The condensation section includes a second inner tube and several large fins; the large fins are arranged obliquely radially around the second inner tube; the second inner tube is connected to the first inner tube; the outer annular gap is connected to the large fins. The outer wall of the second inner tube is provided with several first small fins communicating with it; the outer wall of the large fin is provided with several second small fins communicating with it.

[0008] Preferably, the angle between the large fin and the second inner tube is 15° to 60°.

[0009] Preferably, two adjacent large fins are arranged in a V-shape. The number of large fins is 4 to 10.

[0010] Preferably, the included angle between two adjacent large fins is 10° to 60°.

[0011] Preferably, the width of the large fin gradually increases as it extends from the end connected to the second inner tube to its other free end.

[0012] Preferably, the angle between the first small fin and the outer wall of the second inner tube is 15° to 165°.

[0013] Preferably, the angle between the second small fin and the outer wall of the large fin is 15° to 165°.

[0014] Preferably, the inner diameters of the first inner tube and the second inner tube are 0.5-30 mm; the interior of the large fin is provided with a large fin gap, and the radial thickness of the inner annular gap and the outer annular gap, as well as the thickness of the large fin gap, are all 0.5-10 mm.

[0015] The above-mentioned method of using a three-tube-heat pipe millimeter channel reactor involves introducing a hot fluid into the inner annular gap and introducing a heat exchange medium into the first inner tube and the outer annular gap.

[0016] Preferably, the heat exchange medium includes a liquid medium and inert particles.

[0017] Compared with the prior art, the present invention has the following beneficial technical effects: This invention discloses a three-tube-heatpipe millimeter-channel reactor. Through structural innovation and multi-stage enhanced heat exchange design, this invention effectively solves the problems of high thermal runaway risk, easy clogging, and low heat exchange efficiency in existing tube reactors when handling strongly exothermic reactions such as nitration, chlorination, diazotization, and sulfonation. Firstly, addressing the drawbacks of limited heat exchange area and difficulty in timely removal of large amounts of reaction heat in dual-tube reactors, this invention achieves a structural breakthrough. It employs a three-tube structure in the evaporation section, forming two independent working fluid heating spaces—an inner annulus and an outer annulus—significantly increasing the heat transfer area. More importantly, inert particles are added to the evaporation section to enhance the heat transfer capacity of the heat pipe. The condensation section innovatively features several large fins arranged obliquely radially around the second inner tube, with large fin gaps communicating with the outer annulus. This design greatly expands the heat dissipation area of ​​the condensation section, allowing the gaseous working fluid to condense in contact with the cooling medium over a larger area, thereby significantly improving the overall heat exchange efficiency and ensuring that the enormous heat generated by the strongly exothermic reaction can be quickly and effectively removed, fundamentally reducing the risk of thermal runaway. Secondly, to address the clogging issue in high-viscosity / solid-liquid mixtures, this invention designs the reaction channel at the millimeter scale. This scale retains the advantages of microchannel reactors—good mixing effect and high mass and heat transfer efficiency—while significantly improving the processing capacity of a single channel and reducing flow resistance. Its millimeter-scale annular circumferential scale effectively prevents clogging by solid-containing systems or high-viscosity materials. Furthermore, this invention further enhances the condensation effect by adding first and second small fins to the second inner tube and the outer wall of the large fins. In summary, this reactor, through a three-tube structure, millimeter-scale annular channel design, and multi-stage finned heat exchange enhancement, collaboratively solves the technical bottlenecks in safety and applicability of dual-tube microchannel reactors.

[0018] Furthermore, the angle between the large fins and the second inner tube is 15°~60°. This angle design is crucial for the efficient operation of the gravity heat pipe. The 15°~60° oblique radiation setting provides the optimal angle for the release of gravitational potential energy of the condensed liquid working fluid. Compared to vertical or overly gentle structures, this angle ensures that the condensate slides quickly off the surface of the large fins under gravity, while also preventing droplet accumulation and the formation of "liquid film thermal resistance," thereby significantly shortening the working fluid circulation cycle and improving the heat exchange response speed.

[0019] Furthermore, the two adjacent large fins are arranged in a V-shape, with 4 to 10 large fins in total. The V-shaped structure forms a natural "flow channel" between adjacent large fins, and in the condensation section, the V-shaped opening helps to guide the collected condensate to the center or bottom, preventing droplet splashing or retention, and keeping the fin surface dry to facilitate subsequent heat exchange.

[0020] Furthermore, the included angle between two adjacent large fins is 10°~60°, which allows for sufficient heat exchange between the uniformly distributed large fins and smooth reflux of the working fluid after condensation.

[0021] Furthermore, as the large fins extend from the end connected to the second inner tube to its other free end, their width gradually increases. Since the heat source is concentrated in the central second inner tube, the heat diffuses radially outwards. The gradually increasing width of the large fins increases the heat exchange area away from the heat source, compensating for the decrease in temperature gradient and thus ensuring a more uniform temperature distribution throughout the condensation section. Moreover, this variable cross-section design makes better use of the thermal conductivity of the metal material than constant-width fins, avoiding material waste.

[0022] Furthermore, the angle between the first small fin and the outer wall of the second inner tube is 15°~165°, and the angle between the second small fin and the outer wall of the large fin is 15°~165°. The angle of 15°~165° can break the boundary layer to the greatest extent and effectively enhance turbulence and convection. The small fins are set vertically or at a large angle, which is equivalent to implanting more "heat dissipation needles" in a limited space, greatly increasing the surface area in contact with air and effectively increasing the heat exchange area. In addition, the 45° tilt angle can also play a guiding role, guiding the cooling medium to flow to the surface of the equipment and assisting natural convection or forced convection cooling.

[0023] Furthermore, the inner diameters of the first and second inner tubes are 0.5-30 mm; the interior of the large fins is equipped with large fin gaps, and the radial thickness of the inner and outer annular gaps, as well as the thickness of the large fin gaps, are all 0.5-10 mm. This is a core improvement for solid-containing / high-viscosity systems such as nitration, chlorination, diazotization, and sulfonation. Compared to microchannels, the millimeter-scale annular gap circumferential scale significantly reduces the pressure drop, effectively preventing solid particles or high-viscosity materials from clogging the millimeter channels, increasing the fluid throughput, while maintaining good mass and heat transfer efficiency. Moreover, the tube wall thickness at this scale is sufficient to withstand the pressure required for industrial reactions, thus balancing "enhanced heat transfer" and "engineering practicality".

[0024] This invention also discloses a method for using the aforementioned three-tube-heat pipe millimeter-channel reactor, characterized in that, during use, a hot fluid is introduced into the inner annular gap, while a heat exchange medium is introduced into the first inner tube and the outer annular gap. This method utilizes the unique characteristics of the three-tube structure, allowing the heat exchange medium to simultaneously absorb heat from the hot fluid in the inner annular gap within two independent channels: the first inner tube and the outer annular gap. This design achieves "one heat source, two heat absorption channels," significantly improving heat exchange efficiency. Simultaneously, the hot fluid, i.e., the reactants, and the heat exchange medium, i.e., the heat transfer medium, undergo indirect heat exchange through the tube walls, with physical isolation ensuring the safety of the reaction.

[0025] Furthermore, the heat exchange medium comprises a liquid working fluid and inert particles. The addition of inert particles to the liquid working fluid disrupts the liquid boundary layer, enhancing turbulence and significantly improving the convective heat transfer coefficient. Additionally, the collision of particles during flow prevents fouling from depositing on the tube walls, which is crucial for long-term operation of highly exothermic reactors. Moreover, by selecting different types of liquids and inert particles, various reaction requirements from ambient to high temperatures can be flexibly accommodated. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a front view of a three-tube-heat pipe millimeter channel reactor according to the present invention; Figure 2 This is a left view of a three-tube-heat pipe millimeter channel reactor according to the present invention; Figure 3 This is a partial structural schematic diagram of the condensation section of a three-tube-heatpipe millimeter-channel reactor according to the present invention; Figure 4 This is a partial structural diagram of the large fins in a three-tube-heat pipe millimeter channel reactor according to the present invention; Wherein: 1. Evaporation section; 11. First inner tube; 12. Middle tube; 13. Outer tube; 14. Inner annular gap; 15. Outer annular gap; 2. Condensation section; 21. Second inner tube; 211. First small fin; 22. Large fin; 221. Second small fin; 222. Large fin gap. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0030] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0031] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0032] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0033] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0034] The present invention will now be described in further detail with reference to the accompanying drawings: Example 1 like Figures 1-4 As shown, the present invention discloses a three-tube-heat pipe millimeter channel reactor, including an evaporation section 1 and a condensation section 2; the evaporation section 1 includes a first inner tube 11, a middle tube 12 and an outer tube 13 coaxially arranged from the inside to the outside; an inner annular gap 14 is formed between the first inner tube 11 and the middle tube 12; an outer annular gap 15 is formed between the middle tube 12 and the outer tube 13; The condensation section 2 includes a second inner tube 21 and a plurality of large fins 22; the plurality of large fins 22 are arranged obliquely radially around the second inner tube 21; the second inner tube 21 is connected to the first inner tube 11; the outer annular gap 15 is connected to the large fins 22, and here, the interior of the large fins 22 is provided with large fin gaps 222, that is, the large fin gaps 222 are connected to the outer annular gap 15; The outer wall of the second inner tube 21 is provided with a plurality of first small fins 211, and the second inner tube 21 is internally connected to the first small fins 211; the outer wall of the large fin 22 is provided with a plurality of second small fins 221, and the large fin 22 is internally connected to the second small fins 221.

[0035] The arrangement of several large fins 22 in a radiating oblique pattern around the second inner tube 21 is as follows: one end of each large fin 22 is connected to the condensation section 2, and the other end is arranged radiating obliquely, meaning there is a certain angle between the large fins 22 and the second inner tube 21, ranging from 15° to 60°. Within this angle range, the condensed fluid can quickly and promptly return to the evaporation section. In other words, the large fins 22 are evenly distributed circumferentially from the outer tube. This evenly distributed circumferential arrangement of the large fins 22 provides a large heat exchange area, maximizing the cooling of the evaporating working fluid.

[0036] Furthermore, two adjacent large fins 22 are arranged in a V-shape, and the number of large fins is 4 to 10. In a preferred embodiment, the included angle between two adjacent large fins 22 is 10° to 60°.

[0037] In a more preferred embodiment, the width of the large fin 22 gradually increases as it extends from one end connected to the second inner tube 21 to its other free end.

[0038] In one specific embodiment, a plurality of first small fins 211 are evenly distributed on the outer wall of the second inner tube 21, and a plurality of second small fins 221 are evenly distributed on the outer wall of the large fin 22. The arrangement of the large fin 22, the first small fins 211, and the second small fins 221 increases the heat exchange area and improves the heat exchange efficiency. More specifically, the plurality of first small fins 211 are evenly spaced along the axial direction of the outer wall of the second inner tube 21; the plurality of second small fins 221 are evenly spaced along the length direction of the large fin 22.

[0039] In this embodiment, the reactor adopts a three-tube-heat pipe structure. The evaporation section 1 includes a first inner tube 11, a middle tube 12, and an outer tube 13 coaxially arranged from the inside to the outside. An inner annular gap 14 is formed between the first inner tube 11 and the middle tube 12; an outer annular gap 15 is formed between the middle tube 12 and the outer tube 13. This multi-annular gap structure increases the heat exchange area. When the fluid flows in different annular gaps, it can fully exchange heat with the tube walls. At the same time, the flow of multiple fluids can also enhance the convective heat transfer effect. The heat exchange medium composed of liquid and inert particles is in the first inner tube 11 and the outer annular gap 15. When hot fluid is introduced into the inner annular gap 14, heat is transferred through the inner and outer walls of the first inner tube 11 and the middle tube 12, heating and evaporating the heat exchange medium in the first inner tube 11 and the outer annular gap 15. After evaporation, the heat exchange medium in the first inner tube 11 enters the second inner tube 21 in a gaseous state. It can also be cooled by the connected first small fins 211. After cooling, the working medium flows back to the first inner tube 11 due to gravity. After the heat exchange medium in the outer annular gap 15 evaporates, it enters the dispersed large fin gap 222 in a gaseous state. It can also be cooled through the connected second small fin 221. After cooling, the heat exchange medium flows back into the outer annular gap 15 due to gravity. This improves the overall heat exchange efficiency.

[0040] In a further preferred embodiment, the working fluid of the first inner tube 11 and the outer annular gap 15 is composed of a liquid working fluid and inert particles. That is, different types of liquids and millimeter-scale inert particles are used as the working fluid of the evaporation section of the first inner tube 11 and the outer annular gap 15. The combination of different types of liquids and inert particles can increase the evaporation rate of the evaporation section and thus improve the heat exchange efficiency.

[0041] The liquid working fluid can be one of the following: low temperature working fluid, normal temperature working fluid, medium-high temperature working fluid, or high temperature working fluid. Selecting the appropriate working fluid for different reactions can effectively improve heat exchange efficiency and time.

[0042] The working medium at low temperature can be ammonia, propane, etc.; the working medium at room temperature can be water, ethanol, etc.; the working medium at medium and high temperature can be naphthalene, diphenyl ether, etc.; and the working medium at high temperature can be sodium, potassium, etc. The inert particles can be one of the following: metal particles, metal oxide particles, carbon-based materials, or composite particles. Selecting appropriate inert particles can improve the evaporation rate of the liquid working fluid and increase the heat exchange efficiency.

[0043] Here, the metal particles can be copper powder, aluminum powder, etc.; the metal oxide particles can be aluminum oxide, copper oxide, etc.; the carbon-based materials can be graphene, carbon nanotubes, etc.; and the composite particles can be carbon composite particles, porous carrier-supported particles, etc.

[0044] Further preferably, the angle between the plurality of first small fins 211 and the outer wall of the second inner tube 21 is 15° to 165°. The angle between the plurality of second small fins 221 and the outer wall of the large fin 22 is 15° to 165°. Within the angle range of 15° to 165°, the condensed fluid can be quickly and timely returned to the evaporation section.

[0045] In a further preferred embodiment, the inner diameters of the first inner tube 11 and the second inner tube 21 are 0.5-30 mm; the radial distances between the inner annular gap 14, the outer annular gap 15, and the large fin gap 222 are 0.5-10 mm, meaning the radial thicknesses of the inner annular gap 14 and the outer annular gap 15, and the thickness of the large fin gap 222 are all 0.5-10 mm. The millimeter-scale inner diameter and annular gaps retain the advantages of microchannels, such as low material volume, good mixing effect, and high heat and mass transfer efficiency, while significantly improving single-channel processing capacity and reducing equipment costs. The millimeter-scale circumferential size of the annular gaps further effectively solves the problem of blockage in solid-containing systems.

[0046] In a further preferred embodiment, the first small fin 211 and the second small fin 221 can have different shapes. Fins with a large heat exchange area and high heat exchange efficiency are selected to improve heat exchange efficiency.

[0047] Comparative Example 1 A conventional heat pipe millimeter-channel reactor containing only two tubes was selected for the experiment. This type of heat pipe millimeter-channel reactor includes an inner tube and a coaxially arranged outer tube, forming an annular gap between the inner and outer tubes. During the experiment, a hot fluid is introduced into the inner tube, and a working fluid is introduced into the annular gap. When the hot fluid passes through the inner tube and heat is transferred to the working fluid located in the annular gap, the working fluid begins to evaporate, producing gas. The gas evaporates to the upper part of the annular gap, encounters cold air, condenses, and flows back to the lower part of the annular gap due to gravity.

[0048] When the reaction is carried out using the three-tube-heat pipe millimeter-channel reactor of the present invention, the corresponding liquid working fluid and inert particles are added to the first inner tube 11 and the outer annular gap 15. A hot fluid is introduced into the inner annular gap 14, and the heat of the hot fluid can be transferred to the working fluid located in the first inner tube 11 and the outer annular gap 15. The working fluid is heated and evaporated. The vapor in the outer annular gap 15 escapes into the large fin gap 222, and the vapor in the first inner tube 11 escapes into the second inner tube 21. Furthermore, since the outer wall of the large fin 22 is provided with several second small fins 221, and the outer wall of the second inner tube 21 is provided with several first small fins 211, the contact surface between the vapor and the external cold air is larger, effectively enhancing the condensation effect. The condensed liquid flows back into the annular gap due to gravity. Therefore, under the same experimental conditions, the three-tube-heat pipe millimeter-channel reactor of the present invention can greatly improve the efficiency of the reaction heat conversion, providing a basic condition for the stable conduct of the reaction and also improving the safety of the reactor.

[0049] Comparative Example 2 Compared to the structure of Example 1, this comparative example does not have small fins on the outer wall of the second inner tube 21 and the outer wall of the large fin 22. During the experiment, a hot fluid was introduced into the inner annular gap 14, and a working fluid was introduced into the first inner tube 11 and the outer annular gap 15. The heat from the hot fluid in the inner annular gap 14 was transferred to the working fluid in the first inner tube 11 and the working fluid in the outer annular gap 15. Upon heating, the working fluid in the first inner tube 11 and the working fluid in the outer annular gap 15 began to evaporate. The working fluid in the first inner tube 11 evaporated in a gaseous state into the second inner tube 21. After the air cooled, the cooled fluid flowed back into the first inner tube 11 due to gravity. The working fluid in the outer annular gap 15 evaporated in a gaseous state into the gap 222 of the large fin. After the air cooled, the cooled fluid flowed back into the outer annular gap 15 due to gravity. The results show that, under the same experimental conditions, a three-tube-heat pipe millimeter-channel reactor with small fins greatly improves the efficiency of heat conversion, provides the basic conditions for stable reaction, and also improves the safety of the reactor.

[0050] This invention combines three-tube heat pipe and millimeter-channel technology to propose a three-tube-heat pipe millimeter-channel reactor. Compared with traditional gravity heat pipe and shell-and-tube millimeter-channel reactors, the heat transfer efficiency is greatly improved and the heat transfer time is significantly shortened. Traditional gravity heat pipe and shell-and-tube millimeter-channel reactors rely on a single heat exchange method, resulting in low heat exchange efficiency. The three-tube-heat pipe millimeter-channel reactor, however, increases the heat exchange area, effectively controlling the temperature of strongly exothermic reactions. The heat exchange rate can be precisely controlled by adjusting the working fluid type. Its millimeter-level inner diameter and annular gap circumferential dimensions further effectively solve the problem of blockage in systems containing solids / high viscosity.

[0051] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A three-tube-heat pipe millimeter-channel reactor, characterized in that, It includes an evaporation section (1) and a condensation section (2); The evaporation section (1) includes a first inner tube (11), a middle tube (12) and an outer tube (13) coaxially arranged from the inside to the outside; an inner annular gap (14) is formed between the first inner tube (11) and the middle tube (12); an outer annular gap (15) is formed between the middle tube (12) and the outer tube (13). The condensation section (2) includes a second inner tube (21) and several large fins (22); the several large fins (22) are arranged obliquely and radially around the second inner tube (21); the second inner tube (21) is connected to the first inner tube (11); the outer annular gap (15) is connected to the large fins (22). The outer wall of the second inner tube (21) is provided with a plurality of first small fins (211) communicating with it; the outer wall of the large fin (22) is provided with a plurality of second small fins (221) communicating with it. As the large fin (22) extends from the end connected to the second inner tube (21) to its other free end, its width gradually increases; The inner diameters of the first inner tube (11) and the second inner tube (21) are 0.5-30 mm; the interior of the large fin (22) is provided with a large fin gap (222), and the radial thickness of the inner annular gap (14) and the outer annular gap (15), as well as the thickness of the large fin gap (222), are all 0.5~10 mm.

2. The three-tube-heat pipe millimeter-channel reactor according to claim 1, characterized in that, The angle between the large fin (22) and the second inner tube (21) is 15°~60°.

3. The three-tube-heat pipe millimeter channel reactor according to claim 1, characterized in that, The two adjacent large fins (22) are arranged in a V-shape, and the number of large fins is 4 to 10.

4. A three-tube-heat pipe millimeter-channel reactor according to claim 1, characterized in that, The included angle between two adjacent large fins (22) is 10°~60°.

5. A three-tube-heat pipe millimeter-channel reactor according to claim 1, characterized in that, The angle between the first small fin (211) and the outer wall of the second inner tube (21) is 15°~165°.

6. A three-tube-heat pipe millimeter-channel reactor according to claim 1, characterized in that, The angle between the outer wall of the second small fin (221) and the large fin (22) is 15°~165°.

7. A method of using a three-tube-heat pipe millimeter channel reactor according to any one of claims 1 to 6, characterized in that, In use, a hot fluid is introduced into the inner annular gap (14), and a heat exchange medium is introduced into the first inner tube (11) and the outer annular gap (15).

8. The method of using a three-tube-heat pipe millimeter channel reactor according to claim 7, characterized in that, The heat exchange medium includes a liquid medium and inert particles.

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