Dry reboiler for isotope rectifying tower device

Abstract

The invention discloses a dry reboiler for an isotope rectifying tower device. The dry reboiler comprises a porous thin-wall structure and a heating supporting part, wherein the heating supporting part comprises a liquid collecting surface, the porous thin-wall structure is connected with the heating supporting part and located above the liquid collecting surface of the heating supporting part, and the porous thin-wall structure is configured to provide a capillary surface for liquid to flow; liquid on the liquid collecting surface is sucked into the thin wall of the porous thin-wall structure from bottom to top through capillary force, so that gas and liquid flowing in the porous thin-wall structure are subjected to heat and mass transfer; the heating supporting part is provided with a heating rod, the heating supporting part is further configured to transfer heat to the liquid collecting surface of the heating supporting part and the porous thin-wall structure through the heating rod, and the dry type reboiler can reduce the liquid holdup and has the functions of quickly responding to load change, being compact in structure and the like, so that the production requirements of high efficiency, energy conservation and stability are met.

Description

Technical Field

[0001] The present application relates to heating equipment in the field of distillation technology, and in particular to a dry reboiler for an isotope distillation tower device. Background Art

[0002] In industrial processes such as semiconductors, chemicals, pharmaceuticals, and gas separation, the reboiler is the core supporting equipment of the distillation tower, and its performance directly affects the distillation efficiency, product purity, and system energy consumption.

[0003] Traditional reboilers (such as kettle reboilers, thermosyphon reboilers, etc.) have gradually exposed many limitations in long-term applications: 1) Existing reboilers generally have the problem of excessive liquid holdup, which leads to prolonged residence time of the liquid in the equipment, which not only clogs the gaps in the packing, increases pressure drop, and reduces processing capacity, but may also induce side reactions (such as organic polymerization) in low-temperature environments, seriously affecting product purity. For example, thermosyphon reboilers do not have the capillary siphon enhancement of porous media, and have a high liquid holdup, which is prone to pressure drop and side reaction problems; 2) When faced with operating load fluctuations, traditional reboilers are difficult to quickly adjust the vaporization rate and cannot match the operating flexibility of the packed tower; under low-temperature conditions, The control accuracy of the bottom temperature is limited, and local overheating is prone to occur, which affects the treatment effect of heat-sensitive materials. Therefore, the load adaptability and temperature control are insufficient; 3) Some reboilers have loose structures, occupy a large space, and have low installation flexibility; and when treating low-temperature, easily crystallized materials, the tube walls are prone to scaling, resulting in a decrease in heat transfer efficiency, requiring frequent cleaning and maintenance, and increasing operating costs. For example, the heat transfer surface of the thermal siphon reboiler is mostly a smooth tube wall with weak anti-scaling properties; 4) In the field of isotope separation, traditional materials are difficult to simultaneously achieve efficient selective adsorption (enrichment of heavy components) and capillary siphon action (maintaining dry operating conditions), which limits the separation efficiency and equipment operation stability.

[0004] Therefore, there is an urgent need in this field to develop a dry reboiler for an isotope distillation tower device, which can reduce liquid holdup and has functions such as rapid response to load changes and compact structure, thereby meeting the needs of efficient, energy-saving and stable production. Summary of the Invention

[0005] The purpose of this application is to provide a dry reboiler for an isotope distillation tower device, which can reduce liquid holdup and has functions such as rapid response to load changes and compact structure, thereby meeting the production needs of high efficiency, energy saving and stability.

[0006] The first aspect of the present application provides a dry reboiler for an isotope distillation tower device, wherein the dry reboiler is located inside the distillation tower and at the bottom of the distillation tower, and comprises: a porous thin-wall structure and a heating support portion; wherein, The heating support portion includes a liquid collection surface, the porous thin-walled structure is connected to the heating support portion and is located above the liquid collection surface of the heating support portion, the porous thin-walled structure is configured to provide a capillary surface for liquid flow, and to draw the liquid located on the liquid collection surface from bottom to top into the thin wall of the porous thin-walled structure through capillary force, thereby enabling heat and mass transfer between the gas and liquid flowing in the porous thin-walled structure; The heating support portion is equipped with a heating rod, and the heating support portion is further configured to transfer heat to the liquid collection surface of the heating support portion and the porous thin-walled structure through the heating rod, thereby vaporizing the liquid located on the liquid collection surface and the porous thin-walled structure; The capillary number Ca of the porous thin-walled structure is less than 10 -4 Specific surface area>1000 m 2 / g, the Laplace pressure of the capillary force>10kPa, and the porosity is between 10%-85%, and the equivalent pore size of the porous thin-walled structure is between 5-200 microns, and the permeability is between 6x10 -16 -5x10 -12 m 2 between.

[0007] In another preferred embodiment, the dry reboiler is a vertical reboiler.

[0008] In another preferred example, the porous thin-walled structure includes a thin wall and a gas channel surrounded by the thin wall. During the distillation process, the thin wall provides a liquid channel for liquid flow, and the gas flows from the gas channel of the porous thin-walled structure from bottom to top into the packing of the distillation tower. The liquid is sucked onto the thin wall by capillary force or the liquid from the packing section of the distillation tower flows onto the thin wall.

[0009] In another preferred embodiment, the equivalent pore size of the porous thin-walled structure is between 5 and 100 microns.

[0010] More preferably, the equivalent pore size is between 5 microns and 30 microns.

[0011] In another preferred example, the porous thin-walled structure is a honeycomb porous thin-walled structure, which includes a thin wall and a gas channel surrounded by the thin wall. During the distillation process, the thin wall provides a liquid channel for liquid flow, and the gas flows from the gas channel of the honeycomb porous thin-walled structure from bottom to top into the packing of the distillation tower. The liquid is sucked onto the thin wall by capillary force or the liquid from the packing section of the distillation tower flows onto the thin wall.

[0012] In another preferred embodiment, the porous thin-walled structure is a bionic honeycomb porous thin-walled structure obtained by 3D printing alloy.

[0013] In another preferred embodiment, the porous thin-walled structure is made of MOF material.

[0014] In another preferred embodiment, the porous thin-walled structure is a honeycomb porous thin-walled structure obtained by 3D printing MOF material.

[0015] In another preferred example, the dry reboiler further includes a reboiler shell, the reboiler shell is cylindrical, the porous thin-walled structure is filled in the reboiler shell, and the heating support part is cylindrical.

[0016] In another preferred example, the heating support portion is provided with a heating rod hole for assembling the heating rod.

[0017] In another preferred example, the dry reboiler further includes a liquid level differential pressure gauge, which is configured to detect the height of the liquid in the dry reboiler.

[0018] The second aspect of the present application provides an isotope distillation tower device, which includes a distillation tower, the distillation tower includes one or more sub-towers and a vacuum hood, the sub-tower includes a condenser, a packing section and the above-mentioned dry reboiler, the dry reboiler is a vertical reboiler, the dry reboiler is connected to the bottom of the packing section, and the dry reboiler is communicated with the packing section.

[0019] It should be understood that within the scope of the present invention, the above-mentioned technical features of the present invention and the technical features described in detail below (such as in the embodiments) can be combined with each other to form new or preferred technical solutions. Due to space limitations, they will not be listed here one by one. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. It should be understood that the drawings described below are merely some implementation examples of the present invention, and those skilled in the art can also derive other implementation examples based on these drawings without inventive effort.

[0021] Figure 1 is a schematic diagram of the structure of a dry reboiler for an isotope fractionation column according to one embodiment of the present application; Figure 2 This is a physical image of a porous thin-walled structure obtained by 3D printing an alloy according to one embodiment of the present application; Figure 3 yes Figure 2 Microstructure diagram of Figure 4 is a top view of a porous thin-walled structure of a dry reboiler according to another embodiment of the present application; Figure 5 is a schematic diagram of a porous thin-walled structure and its microstructure obtained by 3D printing an alloy according to another embodiment of the present application; Figure 6 is a schematic diagram of the connection between the dry reboiler of the present application and the packing section of the distillation column according to one embodiment of the present application; Figure 7 Schematic diagram of a distillation device using the dry reboiler of the present application according to one embodiment of the present application.

[0022] In the accompanying drawings, the following are marked 100-Dry Reboiler 1-Porous thin-walled structure 2- Heating support part 200-Condenser 300-packing section 400-feed port 500-tower bottom take-off port 600-Middle sampling port 700-Tower top take-off port 800-Vacuum hood DETAILED DESCRIPTION

[0023] Through extensive and in-depth research, the inventors have developed a novel dry reboiler for isotope distillation towers. This novel dry reboiler, through structural improvements and high-precision liquid level control, can reduce liquid holdup, rendering the liquid level undetectable by a differential pressure gauge and maintaining a "dry" state. The dry reboiler also features rapid response to load changes, a compact structure, strong anti-fouling properties, and enhanced isotope enrichment, thus meeting the demands of efficient, energy-saving, and stable production. The 3D-printed honeycomb thin-walled structure (equivalent pore size 5-200 microns, preferably 5-100 microns) of this application is enhanced by high-flow rate flushing, significantly reducing the risk of fouling and making it particularly suitable for low-temperature, easily crystallized materials.

[0024] In the following description, many technical details are provided to help readers better understand this application. However, those skilled in the art will understand that even without these technical details and various changes and modifications based on the following embodiments, the technical solutions claimed in this application can be implemented.

[0025] the term As used herein, the terms "dry reboiler" and "reboiler" are used interchangeably; In the present invention, all directional indications (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0026] This application has at least one of the following advantages: (a) The dry reboiler of the present application is provided with a porous thin-wall structure. The liquid at the bottom of the reboiler is sucked into the thin wall by the capillary siphon effect of the honeycomb porous material, and the liquid is rapidly vaporized to a very small amount of liquid holdup. The gas-liquid mixture naturally returns to the distillation tower due to the density difference, eliminating the need for external pump power and reducing energy consumption. (b) The highly efficient heat transfer characteristics of the porous thin-walled structure of the dry reboiler of the present application enable rapid adjustment of the vaporization rate when the load changes; the high velocity of the gas-liquid mixture flushes the thin wall, significantly reducing the risk of scaling (especially for low-temperature, easily crystallized materials); (c) The porous thin-walled structure of the dry reboiler of the present application is made of MOF material, which screens isotopes through quantum effects (such as preferential adsorption of deuterium). Optionally, the MOF material of the present application can preferentially adsorb specific components (such as deuterium) through spatial confinement effects and wave function characteristics, thereby enhancing the isotope separation efficiency.

[0027] (d) The dry reboiler of the present application introduces MOF materials and 3D printing technology to obtain a honeycomb porous thin-walled structure through 3D printing of MOF materials. The porous structure design of the MOF material strengthens the capillary siphon effect, significantly reduces the liquid holdup, and realizes dry operation; (e) This application combines the nanoscale pores (0.3-1 nm) of MOF materials into micron-scale porous thin-walled structures (5-30 microns) through 3D printing to form cross-scale mass transfer channels; (f) The anti-fouling mechanism of this application not only relies on surface wettability, but also achieves dynamic self-cleaning through porous adsorption and high flow rate flushing of MOF materials.

[0028] In order to make the purpose, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that these are only some examples that the present invention may take, but are not intended to limit the scope of the present invention.

[0029] Example 1 See also Figure 1The present application provides a dry reboiler for an isotope distillation tower, the dry reboiler is located inside the distillation tower and at the bottom of the distillation tower, the dry reboiler comprises: a porous thin-walled structure 1 and a heating support portion 2; wherein the heating support portion 2 comprises a liquid collection surface, the porous thin-walled structure 1 is connected to the heating support portion 2 and is located above the liquid collection surface of the heating support portion 2, the porous thin-walled structure 1 is configured to provide a capillary surface for liquid flow, and the liquid located on the liquid collection surface is sucked from bottom to top into the porous thin-walled structure 1 by capillary force, so that the porous thin-walled structure The gas and liquid flowing in the honeycomb porous thin-walled structure 1 conduct heat and mass transfer, achieve rapid vaporization to reduce liquid holdup, and at the same time utilize its large specific surface area to enhance gas-liquid heat and mass exchange, and use its own space as an effective distillation section; wherein, the porous thin-walled structure includes a thin wall and a gas channel surrounded by the thin wall. During the distillation process, the thin wall provides a liquid channel for liquid flow, and the gas flows from the gas channel of the honeycomb porous thin-walled structure from bottom to top into the packing of the distillation tower, and the liquid is sucked onto the thin wall by capillary force or the liquid from the packing section of the distillation tower flows onto the thin wall.

[0030] The heating support 2 is equipped with a heating rod, and the heating support 2 is further configured to transfer heat to the liquid collection surface of the heating support 2 and the porous thin-walled structure 1 through the heating rod, thereby vaporizing the liquid located on the liquid collection surface and in the porous thin-walled structure 1; The capillary number Ca of the porous thin-walled structure 1 is less than 10 -4 , specific surface area>1000 m² / g, Laplace pressure of capillary force>10 kPa, and porosity between 10%-85%, and the equivalent pore size of the porous thin-walled structure 1 is between 5-200 microns, and the permeability is 6x10 -16 -5x10 -12 m².

[0031] In this embodiment, the porous thin-walled structure 1 is a biomimetic honeycomb porous thin-walled structure obtained by 3D printing alloy (i.e., a honeycomb thin-walled alloy structure prepared using laser sintering technology). 3D printing alloys (such as metal materials prepared by powder laser sintering) use a biomimetic honeycomb thin-walled structure, preferably with an equivalent pore size reduced to 5-30 microns, to achieve complex three-dimensional topology at a lower cost and enhance heat transfer and anti-scaling performance. Figure 2-Figure 5 ,exist Figure 2-Figure 5Several examples of biomimetic honeycomb porous thin-walled structures obtained by 3D printing alloys are given. The honeycomb porous thin-walled structure includes thin walls and gas channels surrounded by the thin walls. During the distillation process, the thin walls provide liquid channels for liquid flow. Gas flows from the gas channels of the honeycomb porous thin-walled structure from bottom to top into the packing of the distillation tower. Liquid is drawn onto the thin walls by capillary force or flows from the packing section of the distillation tower to the thin walls.

[0032] In other words, the capillary siphon effect of the honeycomb porous material draws the liquid from the bottom into the thin walls of the porous thin-walled structure 1, rapidly vaporizing it and minimizing liquid holdup. Due to the density difference, the gas-liquid mixture naturally returns to the distillation column, eliminating the need for external pumping power and reducing energy consumption. The efficient heat transfer characteristics of the thin-walled structure allow for rapid adjustment of the vaporization rate as the load changes. The high flow rate of the gas-liquid mixture flushes the thin walls and tube walls, significantly reducing the risk of scaling (especially for low-temperature, easily crystallized materials).

[0033] Heating support 2 is provided with heating rod holes for mounting heating rods. This hole layout ensures even heat distribution and prevents local overheating. The heating rods must be compatible with the heating rod hole material and have good thermal conductivity (such as metal) to ensure efficient heat transfer to the honeycomb porous material and the liquid collection surface of heating support 2.

[0034] Because the heating support 2 is located below the porous thin-walled structure 1 and includes a liquid collection surface, it carries the initial heating process of the liquid and is directly connected to the porous thin-walled structure 1, transferring heat to it. It also serves as the starting point for liquid circulation, driving natural circulation by utilizing density differences (the density of the gas-liquid mixture decreases after vaporization). The heating support 2 is made of a high-thermal-conductivity metal material (such as an alloy). When connected to the 3D-printed honeycomb alloy material (porous thin-walled structure 1), it forms a "fluid-side fin" structure, enhancing heat transfer efficiency.

[0035] See also Figure 1 and Figure 6 The reboiler is a vertically mounted carrier. The dry reboiler also includes a reboiler housing, which is used to form a closed cavity to accommodate the porous thin-walled structure 1 and the heating support portion 2, ensuring the overall structural stability of the reboiler. Preferably, the reboiler housing is part of the distillation tower housing and is integrated with the distillation tower housing, for example, welded to the distillation tower. That is, the reboiler is located inside the distillation tower and at the bottom of the distillation tower, thereby saving a lot of space. Preferably, the reboiler housing is generally made of corrosion-resistant and high-temperature resistant metal materials (such as stainless steel or alloys) and is suitable for industrial environments such as chemical industry and gas separation.

[0036] The dry reboiler of the present application also includes a control system, which is composed of a heating rod (preferably an electric heating rod), a liquid level differential pressure gauge and a temperature sensor. The dry reboiler of the present application is used in an isotope distillation tower device. During the distillation process, the distillation tower is first cooled when it is started, and the working fluid forms a liquid level in the dry reboiler 100. The liquid level differential pressure gauge will display a reading, and then the heating power of the heating rod of the heating support part 2 of the dry reboiler 100 is gradually increased, so that the liquid collection surface of the heating support part 2 of the reboiler 100 and the dynamic liquid level of the porous thin-walled structure 1 gradually disappear and reach dynamic equilibrium, thereby allowing the liquid of the distillation tower packing collected by the dry reboiler 100 to be completely vaporized, and the vaporized gas enters the packing section 300 of the sub-tower and participates in the mass transfer exchange process of the distillation tower again.

[0037] Therefore, when the dry reboiler of this application is used in an isotope-enriched distillation column, the actual separation process requires a reduced holdup volume to minimize waste, as many isotope gas sources are relatively scarce and expensive. The liquid holdup of the dry reboiler of this application is over 90% lower than that of a conventional reboiler. The minimum startup volume of a distillation column equipped with a dry reboiler (liquid phase volume approximately 10 mL, with no macroscopic liquid level) is much lower than the minimum startup volume of a conventional reboiler (100 mL).

[0038] When the dry reboiler of the present application is used in the distillation tower device for isotope enrichment, the distillation equilibrium time is compared with the experimental data. 12 CO / 13 For CO isotope gas, the liquid phase volume of the dry reboiler is only at the 10mL level, which greatly shortens the isotope abundance equilibrium time in the reboiler. The traditional reboiler equilibrium time is about 96 hours, while the dry reboiler distillation tower system equilibrium time is about 36 hours.

[0039] Example 2 Unlike Example 1, in this example, the porous thin-walled structure 1 is made of a metal-organic framework (MOF) material. This porous structure utilizes capillary wicking, while also filtering isotopes through spatial confinement effects (zero-point energy differences and wave function distribution characteristics). The quantum effects of the MOF material selectively adsorb specific isotope components (such as deuterium), enhancing separation efficiency. The MOF's pore size (0.3-0.8 nm) precisely matches the molecular dynamics diameters of the isotopes (D2: 0.29 nm, H2: 0.28 nm). This preferential adsorption of heavy components through quantum tunneling allows for simultaneous distillation and isotope enrichment within the reboiler.

[0040] Example 3 Unlike Examples 1 and 2, in this example, the porous thin-walled structure 1 is a honeycomb-shaped porous thin-walled structure obtained by 3D printing MOF materials. This example, based on MOF materials and 3D printing technology, designs a dry reboiler that integrates efficient heat and mass transfer, low liquid holdup, and enhanced isotope enrichment. The MOF material selects isotopes through quantum effects (e.g., preferentially adsorbing deuterium), while its porous structure minimizes the liquid level, maintaining dry operating conditions.

[0041] In this embodiment, by combining MOF materials with 3D printed structures, functions such as heat transfer enhancement, low liquid holdup control, and isotope enrichment are integrated, solving the core pain points of traditional reboilers.

[0042] The ultra-microporous structure (pore size <1nm) and quantum confinement effect of MOF materials (such as SIFSIX-3-Zn) enable the selective adsorption of hydrogen isotopes (such as D2 / H2). This separation mechanism, based on zero-point energy differences and wave function distribution characteristics, improves separation efficiency by over 10,000 times compared to traditional cryogenic distillation methods.

[0043] Example 4 Unlike Examples 1, 2 and 3, in this embodiment, the porous thin-walled structure 1 is a 3D-printed MOF-alloy composite structure, which is a 3D-printed alloy (such as stainless steel 316L) and inlaid with MOF material (such as SIFSIX-3-Zn or MIL-101(Cr)), that is, an integrated preparation process of MOF material (such as SIFSIX-3-Zn or MIL-101(Cr)) and 3D-printed alloy (such as stainless steel 316L), including in-situ growth technology of MOF material on the alloy surface (such as solvothermal method) and interface bonding strength (shear strength>5MPa).

[0044] Example 5 See also Figure 6 and Figure 7 The present application provides an isotope distillation tower device, which includes a feed port 400, a bottom take-off port 500, a middle section sampling port 600, and a top take-off port 700. The feed port 400 is configured to allow product gas to enter, the bottom take-off port 500 is configured to output a high-abundance heavy isotope liquid in the product gas, and the top take-off port 700 is configured to discharge a light isotope gas. For a working fluid with an inverse isotope effect, the bottom take-off port 500 is configured to output a high-abundance light isotope liquid / gas in the product gas (for example, 28 SiF4), the top take-off port 700 is configured to discharge heavy isotope gas ( 29 SiF4 and 30 SiF4).

[0045] The device also includes a distillation tower, which includes one or more sub-towers and a vacuum cover 800. The sub-tower includes a condenser 200, a packing section 300, and the dry reboiler 100 of the above-mentioned embodiment 1, embodiment 2, or embodiment 3. The dry reboiler 100 is a vertical reboiler, which is connected to the bottom of the packing section 300 and is in communication with the packing section 300.

[0046] As mentioned above, when the dry reboiler of the present application is used in the distillation tower device for isotope enrichment, the distillation equilibrium time is compared with the experimental data. 12 CO / 13 For CO isotope gas, the liquid phase volume of the dry reboiler is only at the 10mL level, which greatly shortens the isotope abundance equilibrium time in the reboiler. The traditional reboiler equilibrium time is about 96 hours, while the dry reboiler distillation tower system equilibrium time is about 36 hours.

[0047] It should be noted that in this patent application, relational terms such as first and second, etc., are used solely to distinguish one entity or operation from another, and do not necessarily require or imply any actual relationship or order between these entities or operations. Furthermore, the terms "comprise," "include," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. Without further limitation, an element specified by the phrase "comprising a" does not preclude the presence of additional identical elements in the process, method, article, or apparatus comprising the element. In this patent application, reference to performing an action in accordance with an element means performing the action in accordance with at least that element, including two situations: performing the action in accordance with that element alone, and performing the action in accordance with that element and other elements. Expressions such as "plurality," "multiple times," and "many" include "two," "twice," "two kinds," and "more than two," "more than two times," and "more than two kinds."

[0048] All documents mentioned in this application are considered to be included in their entirety in the disclosure of this application so that they can be used as a basis for modification when necessary. In addition, it should be understood that after reading the above disclosure of this application, those skilled in the art may make various changes or modifications to this application, and these equivalent forms also fall within the scope of protection claimed in this application.

Claims

1. A dry reboiler for an isotope fractionation tower device, characterized in that: The dry reboiler is located inside the distillation tower and at the bottom of the distillation tower. The dry reboiler comprises: a porous thin-wall structure (1) and a heating support part (2); wherein, The heating support portion (2) includes a liquid collection surface, the porous thin-walled structure (1) is connected to the heating support portion (2) and is located above the liquid collection surface of the heating support portion (2), the porous thin-walled structure (1) is configured to provide a capillary surface for liquid flow, and to draw the liquid located on the liquid collection surface from bottom to top into the thin wall of the porous thin-walled structure (1) through capillary force, thereby allowing the gas and liquid flowing in the porous thin-walled structure (1) to transfer heat and mass; The heating support portion (2) is equipped with a heating rod, and the heating support portion (2) is further configured to transfer heat to the liquid collection surface of the heating support portion (2) and the porous thin-walled structure (1) through the heating rod, thereby vaporizing the liquid located on the liquid collection surface and in the porous thin-walled structure (1); The capillary number Ca of the porous thin-walled structure (1) is less than 10 -4 Specific surface area>1000 m 2 / g, the Laplace pressure of the capillary force>10kPa, and the porosity is between 10%-85%, and the equivalent pore size of the porous thin-walled structure (1) is between 5-200 microns, and the permeability is between 6x10 -16 -5x10 -12 m 2 between.

2. The dry reboiler according to claim 1, wherein The porous thin-walled structure (1) comprises a thin wall and a gas channel surrounded by the thin wall. During the distillation process, the thin wall provides a liquid channel for liquid flow. Gas flows from the gas channel of the porous thin-walled structure (1) from bottom to top into the packing of the distillation tower. Liquid is sucked onto the thin wall by capillary force or liquid from the packing section of the distillation tower flows onto the thin wall.

3. The dry reboiler according to claim 1, wherein The equivalent pore size of the porous thin-wall structure is between 5 and 100 microns.

4. The dry reboiler according to claim 1, wherein The porous thin-walled structure (1) is a honeycomb porous thin-walled structure, comprising a thin wall and a gas channel surrounded by the thin wall. During the distillation process, the thin wall provides a liquid channel for liquid flow, and gas flows from the gas channel of the honeycomb porous thin-walled structure (1) from bottom to top into the packing of the distillation tower. Liquid is sucked onto the thin wall by capillary force, or liquid from the packing section of the distillation tower flows onto the thin wall.

5. The dry reboiler according to claim 1, wherein The porous thin-walled structure is a bionic honeycomb porous thin-walled structure obtained by 3D printing alloy.

6. The dry reboiler according to claim 1, wherein The porous thin-walled structure (1) is made of MOF material.

7. The dry reboiler according to claim 5, wherein The porous thin-walled structure (1) is a honeycomb porous thin-walled structure obtained by 3D printing MOF material.

8. The dry reboiler according to claim 1, wherein The dry reboiler further comprises a reboiler shell, the reboiler shell is cylindrical, the porous thin-walled structure (1) is filled in the reboiler shell, and / or the heating support part (2) is cylindrical, and the heating support part (2) is provided with a heating rod hole for assembling the heating rod.

9. The dry reboiler according to claim 1, wherein The dry reboiler further includes a liquid level differential pressure gauge configured to detect a liquid height in the dry reboiler.

10. An isotope distillation tower device, characterized in that: The device comprises a distillation tower, the distillation tower comprises one or more sub-towers and a vacuum cover (800), the sub-tower comprises a condenser (200), a packing section (300) and a dry reboiler according to any one of claims 1 to 8, the dry reboiler is a vertical reboiler, the dry reboiler is connected to the bottom of the packing section (300), and the dry reboiler is in communication with the packing section (300).

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