TRIPLE-PIPE-HEAT PIPE MILLIMETER CHANNEL REACTOR AND USE METHOD THEREOF

Abstract

The present disclosure discloses a triple-pipe-heat pipe millimeter channel reactor and a use method thereof. The reactor includes an evaporation section and a condensation section; the evaporation section adopts a coaxial triple-pipe structure to form an inner annular gap and an outer annular gap; the condensing section includes a second inner pipe and multiple large fins arranged in an oblique radial shape; the second inner pipe is connected to the first inner pipe, and the outer annular gap is connected to the inside of the large fin. The outer wall of the second inner pipe is equipped with the first small fin, and the outer wall of the large fin is equipped with the second small fin.

Description

TECHNICAL FIELD

The present disclosure belongs to the technical field of millimeter channel reactor, and relates to a triple-pipe-heat pipe millimeter channel reactor and a use method thereof.

BACKGROUND

Millimeter channel reactors represent a significant advancement in the fields of continuous flow chemistry and process intensification. As meso-scale reactors positioned between traditional macro-scale reactors, such as stirred tanks and tubular reactors, and micro-scale channel reactors, they are designed to strike a balance between reaction performance and engineering practicality. This makes them a key technological pathway for enabling a smooth transition from laboratory-scale results to industrial production.

Although microchannel reactors exhibit outstanding mass and heat transfer performance, their sub-millimeter channels often pose challenges in industrial scale-up, including susceptibility to clogging, high manufacturing precision requirements, substantial system pressure drops, and limited throughput per unit time. Millimeter channel reactors have emerged as a response to these limitations. While preserving the core benefits of continuous flow technology, such as high specific surface area, precise control of residence time, efficient single-channel fluid handling, superior thermal management, and inherent safety, they also incorporate moderately enlarged channel dimensions. This adjustment significantly enhances system robustness, the ability to process solid-containing or high-viscosity fluids, ease of fabrication, and the production capacity of individual units.

By utilizing specially designed flow channel geometries, millimeter channel reactors achieve efficient mixing even under laminar or transitional flow regimes. Their mass transfer coefficients far exceed those of traditional stirred tanks, enabling reactants to mix at the molecular scale within seconds or even milliseconds. This rapid mixing effectively suppresses side reactions and improves both reaction selectivity and yield. Furthermore, the high specific surface area facilitates exceptional heat transfer performance, allowing for the rapid removal of heat generated by highly exothermic reactions and ensuring precise temperature control, an essential feature for many fast, temperature-sensitive reactions.

In comparison with conventional double-jacketed or triple-pipe heat transfer configurations, heat pipes offer superior performance due to the greater thermal capacity associated with latent heat relative to sensible heat. The incorporation of inert particles in the evaporation section further enhances heat transfer, while fins added to the condensation section increase the heat exchange area and improve condensation efficiency.

SUMMARY

In view of the problems existing in the existing technology, the present disclosure provides a triple-pipe-heat pipe millimeter channel reactor and a use method thereof, the present disclosure is designed to overcome the technical challenges inherent in highly exothermic reactions, such as nitration, chlorination, diazotization, and sulfonation, including the high risk of thermal runaway, susceptibility to blockage in high-viscosity or solid-liquid mixed systems, and poor heat exchange efficiency commonly encountered with existing technologies.

The present disclosure is realized by the following technical scheme:

A triple-pipe-heat pipe millimeter channel reactor, including an evaporation section and a condensation section;

the evaporation section includes a first inner pipe, a middle pipe, and an outer pipe coaxially sleeved from an interior to an exterior; an inner annular gap is formed between the first inner pipe and the middle pipe; an outer annular gap is formed between the middle pipe and the outer pipe;

the condensing section includes a second inner pipe and multiple large fins; multiple large fins are arranged in oblique radiation around the second inner pipe; the second inner pipe is connected to the first inner pipe; the outer annular gap is connected to the large fins;

an outer wall of the second inner pipe is provided with multiple first small fins, and the first small fins are connected to the outer wall of the second inner pipe; the outer walls of the large fins are provided with multiple second small fins, and the second small fins are connected to the outer walls of the large fins.

In some embodiments, an angle between the large fin and the second inner pipe is 15°-60°.

In some embodiments, the two adjacent large fins are arranged in a V-shaped configuration. The number of the large fins is 4-10.

In some embodiments, an angle between the two adjacent large fins is 10°-60°.

In some embodiments, when the large fin extends from one end connected to the second inner pipe to the other free end, a width increases gradually.

In some embodiments, an angle between the first small fin and the outer wall of the second inner pipe is 15°-165 °.

In some embodiments, an angle between the second small fin and the outer wall of the large fin is 15°-165°.

In some embodiments, an inner diameter of the first inner pipe and the second inner pipe is 0.5-30 mm, a large fin gap is set inside the large fin, radial thicknesses of the inner annular gap and the outer annular gap, and a thickness of the large fin gap are 0.5-10 mm.

A use method for a triple-pipe-heat pipe millimeter channel reactor, when used, hot fluid is introduced into the inner annular gap, and a heat transfer working medium is introduced into the first inner pipe and the outer annular gap.

In some embodiments, the heat transfer working medium includes a liquid working medium and inert particles.

Compared with the prior art, the present disclosure has the following beneficial technical effects:

The present disclosure discloses a triple-pipe heat pipe millimeter channel reactor. Through structural innovation and a multi-stage enhanced heat transfer design, the present disclosure effectively addresses the challenges associated with strongly exothermic reactions such as nitration, chlorination, diazotization, and sulfonation, including the high risk of thermal runaway, susceptibility to blockage, and low heat exchange efficiency. First, to overcome the limitations of the double-pipe reactor, namely its restricted heat exchange area and difficulty in promptly removing substantial reaction heat, the present disclosure introduces a structural breakthrough. It employs a triple-pipe configuration in the evaporation section, creating two independent working medium heating spaces: the inner annular gap and the outer annular gap. This design significantly increases the heat transfer area. More importantly, inert particles are added to the evaporation section to further enhance the heat transfer capacity of the heat pipe. In the condensation section, multiple large fins are arranged around the second inner pipe and connected to the outer annular gap. This configuration greatly expands the heat dissipation area, allowing the gaseous working medium to contact and condense with the cooling medium over a larger region. As a result, the overall heat exchange efficiency is substantially improved, ensuring that the immense heat generated by strongly exothermic reactions can be rapidly and effectively removed, thereby fundamentally reducing the risk of thermal runaway. Secondly, to address the issue of blockage in high-viscosity or solid-liquid mixed systems, the reaction channel is designed at the millimeter scale. This scale preserves the advantages of microchannel reactors, such as effective mixing and high mass and heat transfer efficiency, while significantly enhancing the processing capacity of a single channel and reducing flow resistance. The millimeter-scale annular gap effectively prevents blockages caused by solid-containing systems or high-viscosity materials. In addition, the present disclosure further enhances condensation performance by incorporating first and second small fins on the second inner pipe and the outer wall of the large fins. In summary, the reactor overcomes the technical bottlenecks related to the safety and applicability of double-pipe microchannel reactors through a combination of strategies, including a triple-pipe structure, millimeter-scale annular channel design, and multi-stage fin-enhanced heat transfer.

Furthermore, the angle between the large fin and the second inner pipe is between 15° and 60°, which is critical to the efficient operation of the gravity heat pipe. This oblique orientation provides the optimal angle for gravitational potential energy release of the condensed liquid working fluid. Compared with vertical or excessively flat configurations, this angle ensures that the condensate slides rapidly over the surface of the large fin under gravity while preventing droplet accumulation that could lead to “liquid film thermal resistance.” This significantly shortens the working fluid cycle period and improves the heat transfer response speed.

Furthermore, the adjacent large fins are arranged in a V-shaped configuration, with the number of large fins ranging from 4 to 10. The V-shaped structure creates a natural “diversion groove” between adjacent fins. In the condensation section, the V-shaped opening facilitates the collection and guidance of condensate toward the center or bottom, preventing droplet splashing or retention and maintaining a dry fin surface to promote efficient heat transfer.

Furthermore, the angle between two adjacent large fins is between 10° and 60°, ensuring uniform heat transfer distribution among the fins and smooth return of the condensed working fluid.

Furthermore, the width of each large fin gradually increases from the end connected to the second inner pipe toward the free end. Since the heat source is concentrated in the central second inner pipe, heat diffuses radially outward. The outwardly increasing width of the large fin expands the heat transfer area away from the heat source, compensating for the decrease in temperature gradient and ensuring more uniform temperature distribution across the condensation section. Moreover, this variable cross-section design optimizes the use of the thermal conductivity of the metal material, avoiding material waste compared to fins of uniform width.

Furthermore, the angle between the first small fin and the outer wall of the second inner pipe ranges from 15° to 165°, and the angle between the second small fin and the outer wall of the large fin also ranges from 15° to 165°. This angular range maximally disrupts the boundary layer and effectively enhances turbulence and convection. The vertical or steeply angled arrangement of the small fins effectively implants additional “cooling pins” within a limited space, greatly increasing the surface area in contact with air and thus expanding the heat transfer area. In addition, a 45° tilt angle can also guide the cooling medium toward the equipment surface, aiding natural or forced convection cooling.

Furthermore, the inner diameter of the first inner pipe and the second inner pipe is between 0.5 and 30 mm. The radial thickness of the inner and outer annular gaps and the gap within the large fins are all between 0.5 and 10 mm. This represents a core improvement for solid or high-viscosity systems involved in reactions such as nitration, chlorination, diazotization, and sulfonation. Compared with microchannels, the millimeter-scale annular gap significantly reduces pressure drop, effectively prevents blockage by solid particles or high-viscosity materials, enhances fluid processing capacity, and maintains superior mass and heat transfer efficiency. The wall thickness at this scale is sufficient to withstand the pressures required for industrial reactions, balancing “enhanced heat transfer” with “engineering practicality.” The present disclosure also discloses a use method for using the triple-pipe heat pipe millimeter channel reactor, characterized in that, during operation, a hot fluid is introduced into the inner annular gap, while a heat exchange medium is introduced into the first inner pipe and the outer annular gap. This method leverages the triple-pipe structure, allowing the heat transfer working medium to absorb heat from the thermal fluid in the inner annular gap simultaneously through the two independent channels, the first inner pipe and the outer annular gap. This design achieves “one heat source, dual heat absorption channels,” greatly improving heat transfer efficiency. Meanwhile, the thermal fluid (i.e., the reaction material) and the heat transfer working medium (i.e., the heat-conducting medium) exchange heat through the pipe wall, with physical isolation ensuring reaction safety.

Furthermore, the heat transfer working medium includes a liquid working medium and inert particles. The inert particles are added to the liquid working medium. The presence of solid particles disrupts the liquid boundary layer and enhances turbulence, thereby significantly increasing the convective heat transfer coefficient. In addition, particle collisions during flow help prevent fouling from depositing on the pipe wall, which is especially important for strongly exothermic reactors operating over extended periods. By selecting different types of liquids and inert particles, the system can be flexibly adapted to various reaction requirements ranging from room temperature to high temperatures.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly explain the technical scheme of the embodiment of the present disclosure, the following will briefly introduce the drawings needed to be used in the embodiment. It should be understood that the following drawings only show some embodiments of the present disclosure, so they should not be regarded as a limitation of the scope. Ordinary technicians in this field can also obtain other relevant drawings based on these drawings without paying for creative work.

FIG. 1 is a front view of a triple-pipe-heat pipe millimeter channel reactor in the present disclosure;

FIG. 2 is a left view of a triple-pipe-heat pipe millimeter channel reactor in the present disclosure;

FIG. 3 is a schematic diagram of the local structure of the condensation section of a triple-pipe-heat pipe millimeter channel reactor in the present disclosure;

FIG. 4 is a schematic diagram of the local structure of the large fin in a triple-pipe-heat pipe millimeter channel reactor in the present disclosure;

Marks in the figures: 1, evaporation section; 11, the first inner pipe; 12, middle pipe; 13, outer pipe; 14, inner annular gap; 15, outer ring gap; 2, condensation section; 21, the second inner pipe; 211, the first small fin; 22, large fin; 221, the second small fin; 222, large fin gap.

DETAILED DESCRIPTION OF THE EMBODIMENTS

To clarify the purpose, technical solutions, and advantages of the embodiments of the present disclosure, the following provides a clear and complete description of the technical solutions of the embodiments of the present disclosure with reference to the accompanying drawings. It is evident that the described embodiments are some, but not all, of the embodiments of the present disclosure. The components of the embodiments of the present disclosure, as generally described and illustrated in the accompanying drawings herein, may be arranged and designed in a variety of different configurations.

Accordingly, the following detailed description of the embodiments of the present disclosure provided in the accompanying drawings is not intended to limit the scope of the present disclosure claimed for protection, but merely to represent selected embodiments of the present disclosure. Based on the embodiments described in this present disclosure, all other embodiments that may be obtained by persons of ordinary skill in the art without involving inventive effort fall within the scope of protection of this present disclosure.

It should be noted that similar reference numerals and letters denote similar items in the following figures. Therefore, once an item is defined in one figure, it need not be further defined or explained in subsequent figures.

In the description of the embodiments of the present disclosure, it is to be understood that if terms indicating orientation or positional relationships, such as “up,” “down,” “horizontal,” “inside,” etc., are used, these are based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationships in which the product of the present disclosure is typically placed during use. They are used merely for convenience in describing the present disclosure and simplifying the description, and do not indicate or imply that the referenced device or component must have a specific orientation, be constructed in a specific orientation, or operate in a specific orientation. Therefore, they should not be construed as limiting the present disclosure. In addition, terms such as “first” and “second” are used only for the purpose of distinguishing between descriptions and should not be understood as indicating or implying relative importance.

Furthermore, if the term “horizontal” appears, it does not require that the components be absolutely horizontal; rather, they may be slightly inclined. For example, “horizontal” merely indicates that the direction is more horizontal than “vertical,” and does not mean that the structure must be completely horizontal; a slight inclination is permissible.

In the description of the embodiments of the present disclosure, it is also necessary to explain that, unless otherwise explicitly defined and limited, if terms such as “arranged,” “installed,” “connected,” and “coupled” appear, they should be interpreted broadly. For example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may be mechanical connections or electrical connections; they may be direct connections or indirect connections via an intermediate medium, and they may refer to internal communications between two components. For persons of ordinary skill in the art, the specific meanings of the above terms in the present disclosure may be understood based on specific circumstances.

The following provides a further detailed description of the present disclosure in conjunction with the accompanying drawings:

Example 1

As shown in FIG. 1-FIG. 4, the present disclosure discloses a triple-pipe-heat pipe millimeter channel reactor, including an evaporation section 1 and a condensation section 2; the evaporation section 1 includes the first inner pipe 11, the middle pipe 12 and the outer pipe 13 set from the inner to the outer coaxial sleeve; the inner annular gap 14 is formed between the first inner pipe 11 and the middle pipe 12; the outer annular gap 15 is formed between the middle pipe 12 and the outer pipe 13;

the condensation section 2 includes the second inner pipe 21 and multiple large fins 22; multiple large fins 22 are arranged in oblique radiation around the second inner pipe 21; the second inner pipe 21 is connected to the first inner pipe 11; the outer ring gap 15 is connected to the large fin 22, where the large fin gap 222 is set inside the large fin 22, that is, the large fin gap 222 is connected to the outer ring gap 15;

the outer wall of the second inner pipe 21 is provided with multiple first small fins 211, and the internal connection between the second inner pipe 21 and the first small fin 211 is set. The outer wall of the large fin 22 is provided with multiple second small fins 221, and the internal connection setting of the large fin 22 and the second small fin 221.

Multiple large fins 22 are set to radiate obliquely around the second inner pipe 21, one end of the large fin 22 is connected to the condensation section 2, and the other end is set to radiate obliquely; namely, a certain angle is set between the large fin 22 and the second inner pipe 21, the angle is 15°-60°, in the range of 15°-60°, the condensed fluid can be quickly and timely returned to the evaporation section. That is to say, multiple large fins 22 are evenly arranged in the circumferential direction from the outer pipe, the large fin 22 with uniform circumferential arrangement has a large heat transfer area, which can maximize the cooling and evaporation of the working fluid.

The two adjacent large fins 22 are V-shaped, and the number of large fins is 4-10. In a preferred embodiment, the angle between two adjacent large fins 22 is 10°-60 °.

In a more preferred embodiment, when the large fin 22 extends from one end connected to the second inner pipe 21 to the other free end, the width increases gradually.

In a specific implementation example, multiple first small fins 211 are uniformly distributed on the outer wall of the second inner pipe 21, and multiple second small fins 221 are uniformly distributed on the outer wall of the large fin 22. The setting of the large fin 22, the first small fin 211, and the second small fin 221 can increase the heat exchange area and improve the heat exchange efficiency. Furthermore, the first small fin 211 is evenly spaced along the axial direction of the outer wall of the second inner pipe 21; multiple second small fins 221 are evenly spaced along the length direction of the large fin 22.

In this embodiment, the reactor adopts a triple-pipe-heat pipe structure, and the evaporation section 1 includes the first inner pipe 11, the middle pipe 12, and the outer pipe 13 coaxially sleeved from the interior to the exterior. The inner annular gap 14 is formed between the first inner pipe 11 and the middle pipe 12; the outer ring gap 15 is formed between the middle pipe 12 and the outer pipe 13. This multi-annular gap structure increases the heat transfer area, when the fluid flows in different annular gaps, it can fully exchange heat with the pipe wall, and the flow of multiple fluids can also enhance the convective heat transfer effect. The heat transfer working medium, composed of liquid and inert particles, is in the first inner pipe 11 and the outer annular gap 15. When the hot fluid is introduced into the inner annular gap 14, the heat transfer is performed through the inner and outer walls of the first inner pipe 11, and the inner and outer walls of the middle pipe 12, and the heat transfer working medium in the first inner pipe 11 and the outer annular gap 15 is heated and evaporated. The heat transfer working medium in the first inner pipe 11 evaporates and enters the second inner pipe 21 in a gaseous state. It can also be cooled by the connected first small fin 211. After cooling, the working medium returns to the first inner pipe 11 due to gravity. The heat transfer working medium in the outer annular gap 15 evaporates and enters the dispersed large fin gap 222 in a gaseous state, it can also be cooled by the connected second small fin 221. After cooling, the heat transfer working medium returns to the outer annular gap 15 due to gravity, so as to improve the overall heat exchange efficiency.

Furthermore, the working fluid of the first inner pipe 11 and the outer annular gap 15 is composed of liquid working fluid and inert particles, that is, different types of liquid and millimeter-scale inert particles are used as the working fluid of the evaporation section of the first inner pipe 11 and the outer annular gap 15. The combined solid holdup and liquid filling rate of different types of liquid and inert particles can increase the evaporation rate of the evaporation section, thereby improving the heat transfer efficiency.

Among them, the liquid working medium can be one of the low temperature working medium, the normal temperature working medium, the medium and high temperature working medium, and the high temperature working medium; selecting the appropriate working medium for different reactions can effectively improve the heat transfer efficiency and time.

The low temperature working fluid can be ammonia, propane, etc.; the normal temperature working medium can be water, ethanol, etc.; the medium and high temperature working fluids can be naphthalene, diphenyl ether, etc.; the high temperature working fluid can be sodium, potassium, etc.;

among them, the inert particles can be one of the metal particles, metal oxide particles, carbon-based materials, and composite particles; selecting the appropriate inert particles to increase the evaporation rate of the liquid working medium and improve the heat transfer efficiency.

Here, the metal particles can be copper powder, aluminum powder, etc.; the metal oxide particles can be alumina, copper oxide, etc.; the carbon-based materials can be graphene, carbon nanotubes, etc.; the composite particles can be carbon composite particles, porous carrier-loaded particles, etc.

Furthermore, the angle between the first small fin 211 and the outer wall of the second inner pipe 21 is 15°-165°, the angle between the second small fin 221 and the outer wall of the large fin 22 is 15°-165°. In the range of 15°-165°, the condensed fluid can be quickly and timely returned to the evaporation section.

Furthermore, the inner diameter of the first inner pipe 11 and the second inner pipe 21 is 0.5-30 mm; the radial distance between the size of the inner annular gap 14, the outer annular gap 15 and the large fin gap 222 is 0.5-10 mm, that is, the radial thickness of the inner annular gap 14 and the outer annular gap 15, and the thickness of the large fin gap 222 are 0.5-10 mm, the inner diameter and annular gap of millimeter scale not only retain the advantages of less on-line material, good mixing effect, high heat and mass transfer efficiency, but also significantly improve the single channel processing capacity and reduce the equipment cost. The millimeter-scale circumferential scale of the annular gap further effectively solves the problem of solid-containing system blockage.

Furthermore, the structure of the first small fin 211 and the second small fin 221 can be of different shapes, and the fins with a large heat exchange area and high heat exchange efficiency can be selected to improve the heat exchange efficiency.

Comparison Case 1

A conventional heat pipe millimeter channel reactor containing only two pipes was selected for implementation. The heat pipe millimeter channel reactor consists of an inner pipe and an outer pipe coaxially arranged; the inner pipe and the outer pipe form an annular gap between the inner and outer pipes, during the test, the hot fluid is introduced into the inner pipe, and the working medium is introduced into the inner and outer pipe annular gap. When the hot fluid passes through the inner pipe, and the heat is transmitted to the working medium in the inner and outer pipe annular gap through the inner pipe, the working medium begins to evaporate to produce gas. The gas evaporates to the upper part of the inner and outer pipe annular gap, after encountering cold air, it condenses and returns to the lower part of the inner and outer pipe annular gap due to gravity.

When the reaction is carried out in the triple-pipe-heat pipe millimeter channel reactor of the present disclosure, the corresponding liquid working medium and inert particles are added to the first inner pipe 11 and the outer annular gap 15, and the hot fluid is introduced into the inner annular gap 14. The heat of the hot fluid can be transferred to the working medium located in the first inner pipe 11 and the outer annular gap 15, and the working medium is heated and evaporated. The vapor in the outer annular gap 15 escapes to the large fin gap 222, and the vapor in the first inner pipe 11 escapes to the second inner pipe 21. In addition, since the outer wall of the large fin 22 is equipped with multiple second small fins 221, the outer wall of the second inner pipe 21 is equipped with multiple first small fins 211. The contact surface between the steam and the external cold air is larger, which effectively enhances the condensation effect, and the condensed liquid returns to the annular gap due to gravity. Therefore, under the same experimental conditions, a triple-pipe-heat pipe millimeter channel reactor in the present disclosure can greatly improve the efficiency of reaction heat conversion, provide basic conditions for stable reaction, and improve the safety of the reactor.

Comparison Case 2

Compared with the structure of Example 1, the outer wall of the second inner pipe 21 and the outer wall of the large fin 22 do not have small fins. During the test, the hot fluid is introduced into the inner annular gap 14, and the working fluid is introduced into the first inner pipe 11 and the outer annular gap 15, the heat of the hot fluid in the inner annular gap 14 is transferred to fluid in the first inner pipe 11 and the working fluid in the outer annular gap 15 are heated, the working fluid begins to evaporate. The working fluid in the first inner pipe 11 evaporates to the second inner pipe 21 in a gaseous state. After the air is cooled, the cooled fluid returns to the first inner pipe 11 due to gravity, and the working fluid in the outer annular gap 15 evaporates to the large fin gap 222. After the air is cooled, the cooled fluid returns to the outer annular gap 15 due to gravity. The results show that under the same experimental conditions, a triple-pipe-heat pipe millimeter channel reactor with small fins greatly improves the efficiency of reaction heat conversion, provides the basic conditions for the stable reaction, and also improves the safety of the reactor.

The present disclosure combines triple-pipe, heat pipe, and millimeter channel technology, and proposes a triple-pipe-heat pipe millimeter channel reactor. Compared with the traditional gravity heat pipe and the sleeve millimeter channel reactor, the heat transfer efficiency is greatly improved, and the heat transfer time is greatly shortened. The traditional gravity heat pipe and sleeve millimeter channel reactor rely on a single heat exchange mode, and the heat exchange efficiency is low. The heat transfer area of the triple-pipe-heat pipe millimeter channel reactor is improved, and the temperature of the strong exothermic reaction is effectively controlled, the heat transfer rate is precisely controlled by adjusting the type of working fluid. Its millimeter-scale inner diameter and circumferential scale of the annular gap further effectively solve the problem of blockage of solid/high viscosity systems.

The above is only the preferred embodiment of the present disclosure, and is not used to limit the present disclosure. For technicians in this field, the present disclosure can have various changes and changes. Any modifications, equivalent replacements, improvements, etc., made within the spirit and principles of the present disclosure should be included within the scope of protection of the present disclosure.

Claims

1. A triple-pipe-heat pipe millimeter channel reactor, comprising an evaporation section (1) and a condensation section (2);

the evaporation section (1) comprises a first inner pipe (11), a middle pipe (12) and an outer pipe (13) coaxially sleeved from an interior to an exterior; an inner annular gap (14) is formed between the first inner pipe (11) and the middle pipe (12); an outer annular gap (15) is formed between the middle pipe (12) and the outer pipe (13);

the condensing section (2) comprises a second inner pipe (21) and multiple large fins (22); multiple large fins (22) are arranged in oblique radiation around the second inner pipe (21); the second inner pipe (21) is connected to the first inner pipe (11); the outer annular gap (15) is connected to the large fins;

an outer wall of the second inner pipe (21) is provided with multiple first small fins (211) and the first small fins (211) are connected to the outer wall of the second inner pipe (21); the outer walls of the large fins (22) are provided with multiple second small fins (221) and the second small fins (221) are connected to the outer walls of the large fins (22).

2. The triple-pipe-heat pipe millimeter channel reactor according to claim 1, wherein an angle between the large fin (22) and the second inner pipe (21) is 15°-60°.

3. The triple-pipe-heat pipe millimeter channel reactor according to claim 1, wherein the two adjacent large fins (22) are arranged in a V-shaped configuration; a number of large fins is 4-10.

4. The triple-pipe-heat pipe millimeter channel reactor according to claim 1, wherein an angle between the two adjacent large fins (22) is 10°-60°.

5. The triple-pipe-heat pipe millimeter channel reactor according to claim 1, wherein when the large fin (22) extends from one end connected to the second inner pipe (21) to the other free end, a width increases gradually.

6. The triple-pipe-heat pipe millimeter channel reactor according to claim 1, wherein an angle between the first small fin (211) and the outer wall of the second inner pipe (21) is 15°-165°.

7. The triple-pipe-heat pipe millimeter channel reactor according to claim 1, wherein an angle between the second small fin (211) and the outer wall of the large fin (22) is 15°-165°.

8. The triple-pipe-heat pipe millimeter channel reactor according to claim 1, wherein an inner diameter of the first inner pipe (11) and the second inner pipe (21) is 0.5-30 mm, a large fin gap (222) is set inside the large fin (22), radial thicknesses of the inner annular gap (14) and the outer annular gap (15), and a thickness of the large fin gap (222) are 0.5-10 mm.

9. A use method for the triple-pipe-heat pipe millimeter channel reactor according to claim 1, wherein when used, introducing hot fluid into the inner annular gap (14), and introducing a heat transfer working medium into the first inner pipe (11) and the outer annular gap (15).

10. The triple-pipe-heat pipe millimeter channel reactor according to claim 1, wherein the heat transfer working medium comprises a liquid working medium and inert particles.