A spiral tube rectifying column

Abstract

The application relates to the technical field of rectifying tower structures, in particular to a spiral pipe rectifying column which comprises a box body, a hollow spiral pipe arranged in the box body and a heat preservation layer arranged between the box body and the hollow spiral pipe, and the hollow spiral pipe is arranged obliquely. Therefore, aiming at the problems of site limitation of high-tower rectification for isotopes, high tower plate number required for separation due to small volatility, frequent regeneration required for complex adsorption separation due to poor continuity, high cost of centrifugal separation equipment and high separation cost, a spiral pipe rectifying column technology is introduced, and the technical bottlenecks of the traditional methods are effectively solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rectifying column structure, and more particularly to a spiral pipe rectifying column. BACKGROUND

[0002] Rectification is a very important chemical separation technology, but when separating isotopes, the relative volatility of isotopes is very small, and the number of rectification trays is very high, which cannot be solved by conventional rectification. Chemical exchange rectification (heavy water, boron-11), complex adsorption separation (boron-11), centrifugal separation (germanium-72), diffusion separation, high-tower rectification (carbon-13), etc.

[0003] However, the conventional separation methods have different disadvantages: chemical exchange rectification, large amount of exchange agent, poor system stability, high energy consumption, high rectification tower, only suitable for small atomic number substances; complex adsorption separation, poor continuity, frequent regeneration; centrifugal separation, high equipment requirement, large equipment investment, high separation cost; diffusion separation, low separation coefficient, high separation cost; high-tower rectification, very high rectification tower, site limited, etc. SUMMARY

[0004] Based on the above problems, the present application provides a spiral pipe rectifying column to solve the technical problems of "high-tower rectification of isotopes is limited by site, and the number of trays is extremely high due to the small volatility", "complex adsorption separation has poor continuity and needs frequent regeneration", "centrifugal separation is expensive and has high separation cost", and "diffusion separation has low efficiency and high cost".

[0005] To solve the above technical problems, the technical solution adopted by the present application is:

[0006] A spiral pipe rectifying column, comprising a box body, a hollow spiral pipe arranged in the box body, and a heat preservation layer arranged between the box body and the hollow spiral pipe, wherein the hollow spiral pipe is arranged obliquely.

[0007] In a specific implementation, a liquidophilic layer is arranged below the inner wall of the hollow spiral pipe, and a liquidophobing layer is arranged above the inner wall of the hollow spiral pipe.

[0008] In a specific implementation, the diameter of the hollow spiral pipe is 3mm-20mm.

[0009] In a specific implementation, the liquidophilic layer is made of copper powder sintered with a particle size of 10um.

[0010] In a specific implementation, the heat preservation layer between the box body and the hollow spiral pipe is foamed by conventional polyurethane.

[0011] In one specific embodiment, the liquid- repellent layer is a perfluorinated coating.

[0012] In one specific embodiment, the hollow spiral tube pitch is (2-5) times the hollow spiral tube diameter.

[0013] In one specific embodiment, the hollow spiral tube pitch is (2-5) times the hollow spiral tube diameter.

[0014] Advantages of the present application:

[0015] The present application uses a hollow spiral rectification column, changes the traditional rectification liquid, gas up and down exchange mode, exchanges in the spiral channel, prolongs the gas-liquid exchange time and exchange channel length, greatly reduces the rectification column theoretical plate height, greatly improves the rectification efficiency, and has an important role in high separation degree requirement, small capacity product separation. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the provided drawings.

[0017] Figure 1 The structure diagram of the present application is shown in the figure;

[0018] Figure 2 The structure diagram of the hollow spiral tube in the present application is shown in the figure;

[0019] Explanation of reference signs

[0020] 1, box; 2, hollow spiral tube; 3, insulation layer; 4, liquid-philic layer; 5, liquid-repellent layer. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0022] Example 1

[0023] As Figure 1 and 2As shown, it includes a housing 1, a hollow spiral tube 2 disposed in the housing 1, and a heat insulation layer 3 disposed between the housing 1 and the hollow spiral tube 2. The hollow spiral tube 2 is arranged at an inclination, the distillation column is 10m high, and the wall thickness of the hollow spiral tube 2 is 1mm.

[0024] A hydrophilic layer 4 is provided on the lower part of the inner wall of the hollow spiral tube 2, and a hydrophobic layer 5 is provided on the upper part of the inner wall of the hollow spiral tube 2.

[0025] The hydrophilic layer 4 is made by sintering copper powder with a particle size of 10 μm.

[0026] The insulation layer 3 between the box body 1 and the hollow spiral tube 2 is made of conventional polyurethane foam.

[0027] The liquid-repellent layer 5 is a perfluorinated coating;

[0028] The hollow spiral tube 2 has a diameter of 3mm, a pitch of 6mm, and a spiral pitch diameter of 30mm. Naturally abundant germanium tetrafluoride is added to the distillation column under total reflux. The distillation pressure is 0.1MPa, and the pressure difference between the top and bottom of the column is approximately 30% of the flooding point pressure difference. 169 trays were measured, with a tray height of 3.6mm. Under the same height and other operating conditions, the wire mesh θ packing... The number of trays is 22.

[0029] Example 2

[0030] like Figure 1 and 2 As shown, it includes a housing 1, a hollow spiral tube 2 disposed in the housing 1, and a heat insulation layer 3 disposed between the housing 1 and the hollow spiral tube 2. The hollow spiral tube 2 is arranged at an inclination, the distillation column is 10m high, and the wall thickness of the hollow spiral tube 2 is 1mm.

[0031] A hydrophilic layer 4 is provided on the lower part of the inner wall of the hollow spiral tube 2, and a hydrophobic layer 5 is provided on the upper part of the inner wall of the hollow spiral tube 2.

[0032] The hydrophilic layer 4 is made by sintering copper powder with a particle size of 10 μm.

[0033] The insulation layer 3 between the box body 1 and the hollow spiral tube 2 is made of conventional polyurethane foam.

[0034] The liquid-repellent layer 5 is a perfluorinated coating;

[0035] The hollow spiral pipe 2 has a pipe diameter of 20 mm, a pitch of 100 mm, and a spiral center diameter of 1000 mm. The natural abundance of germanium tetrafluoride is added to the rectifying column for total reflux, the rectifying pressure is 0.1 MPa, and the pressure difference between the column top and the column bottom is about 30% of the liquid flooding point pressure difference. The measured number of column plates is 628, and the theoretical column plate height is 15.9 mm. Under the same height and other operating conditions, the wire mesh θ packing The number of column plates is 362.

[0036] Example 3

[0037] As shown in Figure 1 and 2 , this embodiment is the optimal embodiment, which comprises a box body 1, a hollow spiral pipe 2 arranged in the box body 1, and a heat preservation layer 3 arranged between the box body 1 and the hollow spiral pipe 2, the hollow spiral pipe 2 is arranged obliquely, the rectifying column height is 10 m, and the hollow spiral pipe 2 has a pipe wall thickness of 1 mm.

[0038] A liquidophilic layer 4 is arranged below the inner wall of the hollow spiral pipe 2, and a liquidophobe layer 5 is arranged above the inner wall of the hollow spiral pipe 2.

[0039] The liquidophilic layer 4 is made of copper powder sintering with a particle size of 10 μm.

[0040] The heat preservation layer 3 between the box body 1 and the hollow spiral pipe 2 is foamed by conventional polyurethane.

[0041] The liquidophobe layer 5 is a perfluorinated coating layer.

[0042] The hollow spiral pipe 2 has a pipe diameter of 5 mm, a pitch of 10 mm, and a spiral center diameter of 250 mm. The natural abundance of germanium tetrafluoride is added to the rectifying column for total reflux, the rectifying pressure is 0.1 MPa, and the pressure difference between the column top and the column bottom is about 30% of the liquid flooding point pressure difference. The measured number of column plates is 1588, and the theoretical column plate height is 0.6 mm. Under the same height and other operating conditions, the wire mesh θ packing The number of column plates is 36. When rectifying, liquid forms a liquid film spiral and flows downward from the lower side of the inner wall of the hollow spiral pipe 2, gas flows upward from the gas phase space, and the gas-liquid two phases are countercurrently contacted and exchange matter and energy. Since the hollow spiral pipe 2 is inclined, the downward flow speed of the liquid is greatly reduced and uniform flow is maintained. At the same time, since the hollow spiral pipe 2 is arranged obliquely, the gas-liquid exchange channel is greatly lengthened, and the theoretical column plate height is greatly reduced. The rectifying system uses a natural abundance of germanium tetrafluoride rectifying system to prepare germanium tetrafluoride-72 for isotopic separation verification.

[0043] Since the inside lower side of the hollow spiral pipe 2 has a coating of particles of a lyophilic medium and the inside upper side of the hollow spiral pipe 2 has a coating of a lyophobic medium, the liquid, when flowing downward, remains in the lower part of the inside of the hollow spiral pipe 2 due to the effect of surface tension and does not block the gas-liquid passage due to condensation and irregular flow.

[0044] Finally, it should be noted that the terminology used herein, such as the relationship terms "first" and "second", are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "comprise", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such a process, method, article or device. Without more limitations, the element defined by the statement "comprises a" does not exclude the presence of other identical elements in the process, method, article or device that includes the element.

[0045] The above description of disclosed embodiments enables one of ordinary skill in the art to make or use the application. Various modifications to these embodiments will be readily apparent to those of ordinary skill in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Accordingly, the application is not to be limited to the embodiments shown herein but is to be accorded the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A spiral tube rectification column, characterized by, The application relates to a heat preservation box, which comprises a box body (1), a hollow spiral pipe (2) arranged in the box body (1) and a heat preservation layer (3) arranged between the box body (1) and the hollow spiral pipe (2), wherein the hollow spiral pipe (2) is arranged in an inclined manner. A liquid-philic layer (4) is arranged below the inner wall of the hollow spiral pipe (2), and a liquid-phobic layer (5) is arranged above the inner wall of the hollow spiral pipe (2).

2. A spiral tube rectifying column according to claim 1, characterized in that The pipe diameter of the hollow spiral pipe (2) is 3-20 mm.

3. A spiral column rectification column according to claim 1, characterized in that The liquid-philic layer (4) is made of copper powder with a particle size of 10 mu m.

4. A spiral column rectification column according to claim 1, characterized in that The heat preservation layer (3) between the box body (1) and the hollow spiral pipe (2) is made of conventional polyurethane foam.

5. A spiral column rectification column according to claim 1, wherein, The liquid-phobic layer (5) is a perfluorinated coating layer.

6. A spiral duct rectifying column according to claim 1, characterized in that, The pitch of the hollow spiral pipe (2) is (2-5) times the pipe diameter of the hollow spiral pipe (2).

7. A spiral column rectification column according to claim 1, wherein, The spiral middle diameter of the hollow spiral pipe (2) is (10-50) times the pipe diameter of the hollow spiral pipe (2).

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