A low-temperature distillation tower

Abstract

An embodiment of the present invention provides a cryogenic distillation tower, which includes a condenser, a distillation column, a connector, a support assembly, and an adapter. The condenser is used to condense a gaseous target substance; the distillation column is used to distill the target substance; the connector is connected between the condenser and the distillation column; the condenser is located above the support assembly, the distillation column is located below the support assembly, and the connector is inserted into and fixed in the support assembly; the adapter is connected between the connector and the support assembly, and a heat transfer path is formed between the support assembly and the connector, the distillation column, and the condenser only through the adapter; the thermal conductivity of the material of the adapter is lower than the thermal conductivity of the material of the connector and the support assembly. The cryogenic distillation tower in the embodiment of the present invention is conducive to maintaining the low temperature of the low-temperature coolant in the condenser by providing the adapter, thereby reducing the power consumption of the condenser; and reducing the probability of problems such as structural extrusion deformation and ice blockage caused by ice formation on the support assembly and the connector.

Description

Technical Field

[0001] The present invention relates to the technical field of cryogenic distillation, and in particular to a cryogenic distillation tower. Background Art

[0002] A cryogenic distillation tower is a device that performs distillation at low temperatures to increase the concentration of a target substance.

[0003] During operation of the cryogenic distillation tower, the fillers, catalysts and other parts will be replaced regularly. Therefore, the structure of the cryogenic distillation tower is detachable.

[0004] A condenser is provided in the cryogenic distillation tower for condensing part of the gaseous target substance in the cryogenic distillation tower into liquid, so that contact mass transfer can be achieved between the gas and liquid phases of the target substance in the cryogenic distillation tower.

[0005] External heat can be conducted to the condenser through the connection structure of the condenser, causing the temperature of the condenser to rise, thereby affecting the distillation effect of the entire distillation process. Summary of the Invention

[0006] In view of this, embodiments of the present application hope to provide a cryogenic distillation tower capable of reducing heat conduction between the condenser and the outside world.

[0007] To achieve the above objectives, the technical solution of the embodiment of the present application is implemented as follows:

[0008] An embodiment of the present invention provides a cryogenic distillation tower, comprising:

[0009] a condenser for condensing a gaseous target substance;

[0010] a distillation column for distilling the target substance;

[0011] A connecting piece connected between the condenser and the distillation column;

[0012] A support assembly, wherein the condenser is located above the support assembly, the distillation column is located below the support assembly, and the connecting member is passed through and fixed in the support assembly;

[0013] an adapter, the adapter being connected between the connector and the support assembly, wherein a heat transfer path is formed between the support assembly and the connector, the distillation column, and the condenser only through the adapter;

[0014] The thermal conductivity of the material of the adapter is lower than the thermal conductivity of the materials of the connecting member and the supporting assembly.

[0015] In some embodiments, the adapter is made of ceramic or rubber, and the support assembly and the adapter are made of stainless steel.

[0016] In some embodiments, the connecting member includes a connecting tube and a limiting protrusion, the connecting tube connects the condenser and the distillation column, the limiting protrusion is provided on the circumferential outer surface of the connecting tube, and the adapter abuts against the limiting protrusion along the vertical direction.

[0017] In some embodiments, the adapter is provided with a first mounting hole extending vertically therethrough, and the connecting tube is passed through the first mounting hole.

[0018] In some embodiments, the support assembly is provided with a second mounting hole extending vertically therethrough, the connecting member is passed through the second mounting hole, and an inner wall of the second mounting hole is spaced from the connecting member.

[0019] In some embodiments, the support assembly includes a flange and a support member, the flange is provided with a first through hole extending vertically therethrough, the support member is provided with a second through hole extending vertically therethrough, the support member is located at the top of the flange and abuts against the flange in the vertical direction, the top of the support member abuts against the adapter in the vertical direction, the first through hole and the second through hole are connected to form the second mounting hole.

[0020] In some embodiments, a recessed area is provided on the top surface of the flange, the first through hole is located in the recessed area, and the support member abuts against the top surface of the recessed area along a vertical direction.

[0021] In some embodiments, the cryogenic distillation tower includes a top cover, which is buckled onto the top of the flange and sealed with the flange to form a first installation space together with the flange, and the condenser is located in the first installation space.

[0022] In some embodiments, an annular sealing groove is provided on the top surface of the flange, the first through hole is located inside the annular sealing groove, a sealing ring is provided in the annular sealing groove, and the top cover is sealed and pressed against the sealing ring.

[0023] In some embodiments, the low-temperature distillation tower includes a bottom cover, which is arranged at the bottom of the support assembly and is sealed with the support assembly to form a second installation space together with the support assembly. The distillation column is located in the second installation space, and the bottom cover is provided with an exhaust hole, one end of which is connected to the second installation space.

[0024] The low-temperature distillation tower in the embodiment of the present invention, by providing a connector, not only connects the condenser and the distillation column to realize the distillation operation, but also transfers the weight of the condenser and the distillation column to the support assembly, which not only provides an installation position for the two, but also avoids the condenser and the distillation column from directly serving as a load-bearing structure, which is beneficial to reducing the structural weight of the two. By providing an adapter with poorer heat conductivity, the ability of the condenser to exchange heat with the outside world through the connector and the support assembly is reduced, and the external heat transferred to the condenser is reduced, which is beneficial to maintaining the low-temperature coolant in the condenser at a low temperature, and further beneficial to improving the efficiency of the target substance condensing into a liquid state, reducing the probability of the liquid target substance re-sublimating into a gaseous state, so that the distillation operation in the distillation tower can proceed smoothly, which is beneficial to reducing the power consumption of the condenser; at the same time, it reduces the probability of problems such as structural extrusion deformation and ice blockage caused by ice formation on the support assembly and the connector, thereby improving the service life of the distillation tower. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the arrangement of the connector, support assembly, adapter and bottom cover in one embodiment of the present invention;

[0026] Figure 2 A schematic diagram of a flange according to an embodiment of the present invention;

[0027] Figure 3 is a schematic diagram of a connecting member in one embodiment of the present invention;

[0028] Figure 4 is a schematic diagram of an adapter in one embodiment of the present invention;

[0029] Figure 5 is a schematic diagram of a support member in one embodiment of the present invention;

[0030] Figure 6 Schematic cross-section of a connector, a support assembly, and an adapter in one embodiment of the present invention.

[0031] Description of Reference Numerals

[0032] Connecting member 10; connecting tube 11; communicating hole 11a; limiting protrusion 12; supporting assembly 20; second mounting hole 20a; flange 21; first through hole 21a; recessed area 21b; annular sealing groove 21c; supporting member 22; second through hole 22a; adapter 30; first mounting hole 30a; bottom cover 40; exhaust hole 40a DETAILED DESCRIPTION

[0033] It should be noted that, unless there is a conflict, the embodiments and technical features in the embodiments of this application can be combined with each other, and the detailed description in the specific implementation method should be understood as an explanation of the purpose of this application and should not be regarded as an improper restriction on this application.

[0034] In the description of this application, the orientation or position relationship of "top", "bottom" and "vertical direction" is based on the attached Figure 1 The orientation or position relationship shown in the figure is based on the orientation or position relationship of the attached Figure 6 Regarding the orientation or positional relationship shown, it should be understood that these orientation terms are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0035] The embodiment of the present invention provides a cryogenic distillation tower, referring to Figure 1 The low-temperature distillation tower includes a condenser, a distillation column, a connecting piece 10, a supporting assembly 20 and a transition piece 30.

[0036] The condenser is used to condense the gaseous target substance.

[0037] The condenser is equipped with a cryogenic coolant. After the gaseous target substance enters the cryogenic distillation column, a portion rises to the top and enters the condenser, exchanging heat with the cryogenic coolant in the condenser, causing this portion of the target substance to condense into a liquid state. The liquid target substance then falls into the distillation column under the action of gravity.

[0038] The specific form of the condenser is not limited, such as tube type, plate type and plate-fin type.

[0039] The specific material of the condenser is not limited, such as copper, stainless steel and aluminum alloy, etc., which has high thermal conductivity to facilitate heat exchange between the gaseous target substance and the low-temperature coolant in the condenser and improve the efficiency of heat exchange.

[0040] The specific type of cryogenic coolant is not limited, such as liquid nitrogen.

[0041] The specific type of the input target substance is not limited, such as CO (carbon monoxide), CH4 (methane), etc.

[0042] The distillation column is used to distill the target substance.

[0043] A packing section is provided in the distillation column, and heat and mass transfer occurs between the gaseous target substance and the liquid target substance in the packing section, thereby achieving the concentration of the target substance.

[0044] It should be noted that the specific mechanism, reaction conditions and other technical parameters for achieving concentration of the target substance in the packing section have been maturely applied in related technologies and will not be elaborated here.

[0045] The specific type of the packing in the packing section is not limited, such as plate corrugated packing, grid packing, wire mesh corrugated structured packing, pulse packing, bulk packing, etc.

[0046] The connector 10 is connected between the condenser and the distillation column to connect the two, so that the liquid target substance can pass through the connector 10 and enter the distillation column.

[0047] The specific number of the distillation columns in the cryogenic distillation tower is not limited and can be one or more. The specific number of the condensers is not limited and can be one or more.

[0048] The number of the rectification columns and the number of the condensers can be the same to achieve corresponding settings of the two.

[0049] The condenser is located above the support assembly 20, and the distillation column is located below the support assembly 20. The connector 10 is inserted into and fixed to the support assembly 20. In other words, the connector 10 is fixedly connected to the support assembly 20, and the condenser and the distillation column are suspended by the connector 10, so that the main structures of the condenser and the distillation column do not bear any load, reducing the possibility of damage to both.

[0050] The weight of the condenser and the distillation column is transferred to the support assembly 20 through the connecting member 10, and the support assembly 20 bears the weight of the condenser and the distillation column.

[0051] The adapter 30 is connected between the connector 10 and the support assembly 20. The only heat transfer path between the support assembly 20 and the connector 10, the distillation column, and the condenser is through the adapter 30. In other words, the connector 10, the distillation column, and the condenser do not come into direct contact with the support assembly 20, so that heat between them and the support assembly 20 is conducted solely through the adapter 30.

[0052] The thermal conductivity of the material of the adapter 30 is lower than that of the material of the connector 10 and the support assembly 20. In other words, the thermal conductivity of the material of the connector 10 and the material of the support assembly 20 are both greater than the thermal conductivity of the material of the adapter 30.

[0053] The low-temperature distillation tower in the embodiment of the present invention is provided with a connector 10, which not only connects the condenser and the distillation column to realize the distillation operation, but also realizes the function of transferring the weight of the condenser and the distillation column to the support assembly 20, providing an installation position for the two, and avoiding the condenser and the distillation column from directly serving as a load-bearing structure, which is beneficial to reducing the structural weight of the two. By providing an adapter 30 with poorer heat conductivity, the ability of the condenser to exchange heat with the outside world through the connector 10 and the support assembly 20 is reduced, and the external heat transferred to the condenser is reduced, which is beneficial to maintaining the low-temperature coolant in the condenser at a low temperature, thereby improving the efficiency of the target substance condensing into a liquid state, reducing the probability of the liquid target substance re-sublimating into a gaseous state, and allowing the distillation operation in the low-temperature distillation tower to proceed smoothly, which is beneficial to reducing the power consumption of the condenser; at the same time, the probability of problems such as structural extrusion deformation and ice blockage caused by ice formation on the support assembly 20 and the connector 10 is reduced, thereby improving the service life of the low-temperature distillation tower.

[0054] The specific material of the adapter 30 is not limited.

[0055] For example, the material of the adapter 30 is ceramic, which has the characteristics of high hardness, high wear resistance, oxidation resistance, and low thermal conductivity; for another example, the material of the adapter 30 is rubber, which has the characteristics of high elasticity and low thermal conductivity, and can reduce the heat conducted from the outside to the condenser, while absorbing the vibration and noise during the operation of the low-temperature distillation tower.

[0056] The specific materials of the supporting assembly 20 and the connecting member 10 are not limited.

[0057] For example, the support assembly 20 and the adapter 30 are made of stainless steel to improve structural strength and reduce manufacturing costs.

[0058] The specific structural form of the connecting member 10 is not limited.

[0059] In some embodiments, see Figure 3 and Figure 6The connecting member 10 includes a connecting tube 11 and a limiting protrusion 12. The connecting tube 11 connects the condenser and the distillation column. The limiting protrusion 12 is provided on the circumferential outer surface of the connecting tube 11. The adapter 30 abuts against the limiting protrusion 12 in the vertical direction, that is, the top of the adapter 30 fits with the bottom of the limiting protrusion 12. The connecting tube 11 connects the condenser and the distillation column so that the target substances in liquid and gaseous states can flow between the condenser and the distillation column. Moreover, the weight of the condenser and the distillation column is transferred to the limiting protrusion 12 through the connecting tube 11, and then to the adapter 30, thereby forming a force transmission path in the vertical direction. That is, the adapter 30 conducts heat and weight at the same time. On the one hand, gravity is used to make the connection between the adapter 30 and the connecting member 10 tighter, reducing the probability of the two being separated during the operation of the low-temperature distillation tower; on the other hand, it is conducive to reducing the number of parts and simplifying the structure of the low-temperature distillation tower.

[0060] A through-hole 11 a is provided in the connecting piece 10 . One end of the through-hole 11 a is connected to the rectification column, and the other end is connected to the condenser.

[0061] The inner diameter of the communicating hole 11a may be kept consistent along its extending direction, or may be varied according to the conditions of the condenser and the rectification column.

[0062] In some embodiments, see Figure 6 The adapter 30 is clamped between the limiting protrusion 12 and the support assembly 20 in the vertical direction, so that the weight of the condenser and the distillation column is finally transferred to the support assembly 20, while reducing the probability of separation between the adapter 30 and the support assembly 20.

[0063] In some embodiments, see Figure 1 and Figure 4 The adapter 30 is provided with a first mounting hole 30a extending vertically therethrough, and the connecting tube 11 is inserted into the first mounting hole 30a. The inner wall of the first mounting hole 30a constrains the horizontal range of motion between the adapter 30 and the connecting member 10. Combined with the adapter 30's vertical contact with the limiting protrusion 12, the adapter 30's freedom of movement is limited, reducing the chance of separation between the adapter 30 and the connecting member 10 and improving installation stability.

[0064] The inner wall of the first mounting hole 30a and the outer surface of the user connection tube 11 may or may not be in contact with each other.

[0065] In some embodiments, see Figure 4 The adapter 30 is cylindrical to reduce the probability of stress concentration and improve stability. At the same time, it can contact the connector 10 more evenly, making heat transfer more uniform and reducing the probability of ice formation.

[0066] There is no limitation on the manner in which the connecting member 10 is inserted into the supporting assembly 20 .

[0067] In some embodiments, see Figure 2 and Figure 6 The support assembly 20 is provided with a second mounting hole 20a extending vertically therethrough. The connector 10 is inserted into the second mounting hole 20a, with a distance between the inner wall of the second mounting hole 20a and the connector 10. On the one hand, the inner wall of the second mounting hole 20a constrains the range of motion of the connector 10, reducing the chance of separation between the support assembly 20 and the connector 10. On the other hand, the inner wall of the second mounting hole 20a does not contact the connector 10, facilitating installation of the connector 10 in the support assembly 20 while preventing heat from being directly transferred between the support assembly 20 and the connector 10.

[0068] In the embodiment with the connecting cylinder 11 and the limiting protrusion 12, see Figure 6 The connecting tube 11 is inserted into the second mounting hole 20a, and the limiting protrusion 12 is located at the top side of the second mounting hole 20a. In a vertical projection, the connecting tube 11 is within the projection of the second mounting hole 20a, and the projection of the limiting protrusion 12 at least partially overlaps with the projection of the second mounting hole 20a. The limiting protrusion 12 can vertically abut the edge of the second mounting hole 20a, thereby facilitating adjustment of the vertical installation position of the connecting tube 11 and improving assembly efficiency.

[0069] It can be understood that in the embodiment provided with the first mounting hole 30a and the second mounting hole 20a, the horizontal constraint between the support assembly 20, the connecting member 10 and the adapter 30 is achieved through the inner wall of the first mounting hole 30a and the inner wall of the second mounting hole 20a. Combined with the fact that the adapter 30 and the connecting member 10 are pressed against the support assembly 20 under the action of gravity, the purpose of fixing the relative positions of the support assembly 20, the connecting member 10 and the adapter 30 is achieved.

[0070] The specific structural form of the support assembly 20 is not limited.

[0071] In some embodiments, see Figure 2 、 Figure 5 and Figure 6The support assembly 20 includes a flange 21 and a support member 22. The flange 21 is provided with a first through hole 21a extending vertically therethrough. The support member 22 is provided with a second through hole 22a extending vertically therethrough. The support member 22 is located at the top of the flange 21 and abuts against the flange 21 in the vertical direction. The top of the support member 22 abuts against the adapter 30 in the vertical direction. The first through hole 21a and the second through hole 22a are connected to form a second mounting hole 20a. In other words, the connector 10 passes through both the flange 21 and the support member 22. The support member 22 supports the adapter 30 in the vertical direction and transfers the weight it carries to the flange 21. By providing the support member 22, the structural strength of the connection between the support assembly 20 and the adapter 30 can be enhanced without increasing the overall thickness of the flange 21, thereby reducing the production process and lowering the production cost.

[0072] It can be understood that the inner wall of the first through hole 21 a and the inner wall of the second through hole 22 a are both spaced apart from the connecting member 10 in the horizontal direction.

[0073] The flange 21 and the support member 22 may be made of the same material or different materials.

[0074] In some embodiments, see Figure 5 The support member 22 is cylindrical to reduce the probability of stress concentration and improve the stability of the installation.

[0075] See Figure 2 The flange 21 is circular, and the plurality of first through holes 21a are symmetrically arranged about the center of the flange 21 to improve the installation stability of the entire cryogenic distillation tower.

[0076] The specific method for fixing the flange 21 and the support member 22 is not limited.

[0077] In some embodiments, see Figure 2 and Figure 6 The top surface of the flange 21 is provided with a recessed area 21b, in which the first through-hole 21a is located. The support member 22 abuts the top surface of the recessed area 21b in the vertical direction. The recessed area 21b facilitates positioning of the support member 22 during installation, improving assembly efficiency. Furthermore, the horizontal sidewalls of the recessed area 21b secure the support member 22 in the horizontal direction, while the vertical bottom wall of the recessed area 21b supports and limits the support member 22 in the vertical direction, thereby fixing the relative position between the flange 21 and the support member 22 and facilitating subsequent assembly and disassembly.

[0078] The stability of the fixation between the flange 21 and the support member 22 can be further improved, for example, by welding the flange 21 and the support member 22 by spot welding.

[0079] It is understandable that the condenser is prevented from being directly exposed to the outside world so that direct heat conduction cannot occur between the condenser and the outside world.

[0080] In some embodiments, the cryogenic distillation column includes a top cover that snaps onto the top of flange 21 and is sealed therewith. Together with flange 21, the top cover and flange 21 enclose a first installation space, in which the condenser is located. The top cover protects the condenser, reducing the likelihood of damage from collisions. Furthermore, the top cover isolates the condenser from the outside world, preventing direct heat exchange between the condenser and outside air, thereby reducing the condenser's power consumption.

[0081] It is understandable that the first installation space is vacuumed to further reduce heat exchange between the outside and the condenser.

[0082] It is understandable that the top cover and the flange 21 are detachably connected so that the top cover can be subsequently disassembled and assembled to facilitate repair and maintenance of the condenser.

[0083] The specific manner of achieving the detachable connection between the top cover and the flange 21 is not limited. For example, the top cover and the flange 21 are connected by bolts.

[0084] It is understandable that the connection position between the top cover and the flange 21 is located at the edge of the flange 21 along the horizontal direction, so as to increase the volume of the first installation space as much as possible.

[0085] It is understandable that the joint between the top cover and the flange 21 needs to be sealed to reduce the probability of outside air entering the first installation space through the joint and exchanging heat with the condenser.

[0086] Specifically, see Figure 1 and Figure 2 An annular sealing groove 21c is provided on the top surface of the flange 21, and the first through hole 21a is located on the inner side of the annular sealing groove 21c. A sealing ring is provided in the annular sealing groove 21c. The top cover and the sealing ring are sealed and pressed together. The sealing ring, the top cover and the flange 21 are squeezed and fitted in the vertical direction, thereby achieving the purpose of sealing the joint position between the top cover and the flange 21, and reducing the probability of air outside the sealing ring entering the inside of the sealing ring.

[0087] The specific material of the sealing ring is not limited, such as rubber.

[0088] It is understandable that after the liquid target substance enters the distillation column, if it absorbs heat and sublimates back into gas before coming into contact with the gaseous target substance, the efficiency of the distillation operation will be affected. Therefore, it is necessary to reduce the heat exchange between the outside world and the distillation column.

[0089] In some embodiments, see Figure 1 The low-temperature distillation tower includes a bottom cover 40, which is covered on the bottom of the support assembly 20 and is sealed with the support assembly 20 to form a second installation space together with the support assembly 20. The distillation column is located in the second installation space. On the one hand, the bottom cover 40 can play a certain protective role on the distillation column and reduce the probability of damage to the distillation column caused by collision; on the other hand, the bottom cover 40 can separate the distillation column from the outside world, avoiding direct heat exchange between the outside air and the distillation column, thereby improving the efficiency of the distillation operation.

[0090] In some embodiments, see Figure 1 The bottom cover 40 is provided with an air extraction hole 40a, one end of which is connected to the second installation space. The air extraction hole 40a is connected to the vacuum pumping device to vacuum the second installation space, thereby further reducing the heat exchange between the outside world and the distillation column.

[0091] In some embodiments, the cryogenic distillation column includes a support frame, which is supported between the support assembly 20 and the ground, so that the weight of the cryogenic distillation column is transferred to the ground and fixed.

[0092] The connection method between the bracket and the support assembly 20 is not limited, for example, bolt connection, so as to facilitate subsequent disassembly and maintenance.

[0093] In some embodiments, the bracket is connected to the flange 21 along the horizontal edge to reduce interference of the bracket installation on the condenser and the distillation column.

[0094] The various embodiments / implementations provided in this application can be combined with each other without causing any contradiction.

[0095] The foregoing description is merely a preferred embodiment of the present application and is not intended to limit the present application. Persons skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A cryogenic distillation tower, characterized in that: The cryogenic distillation tower comprises: a condenser for condensing a gaseous target substance; a distillation column for distilling the target substance; A connecting piece connected between the condenser and the distillation column; A support assembly, wherein the condenser is located above the support assembly, the distillation column is located below the support assembly, and the connecting member is passed through and fixed in the support assembly; an adapter, the adapter being connected between the connector and the support assembly, wherein a heat transfer path is formed between the support assembly and the connector, the distillation column, and the condenser only through the adapter; The thermal conductivity of the material of the adapter is lower than the thermal conductivity of the materials of the connecting member and the supporting assembly; The connecting member includes a connecting tube and a limiting protrusion, the connecting tube connects the condenser and the distillation column, the limiting protrusion is provided on the circumferential outer surface of the connecting tube, and the adapter abuts against the limiting protrusion along the vertical direction.

2. The cryogenic distillation tower according to claim 1, characterized in that The material of the adapter is ceramic or rubber, and the material of the supporting component is stainless steel.

3. The cryogenic distillation tower according to claim 1, wherein The adapter is provided with a first mounting hole penetrating in a vertical direction, and the connecting tube is passed through the first mounting hole.

4. The cryogenic distillation tower according to claim 1, wherein The support assembly is provided with a second mounting hole penetrating in a vertical direction, the connecting member is passed through the second mounting hole, and an inner wall of the second mounting hole and the connecting member are spaced apart.

5. The cryogenic distillation tower according to claim 4, characterized in that The support assembly includes a flange and a support member, the flange is provided with a first through hole extending along the vertical direction, the support member is provided with a second through hole extending along the vertical direction, the support member is located at the top of the flange and abuts against the flange in the vertical direction, the top of the support member abuts against the adapter in the vertical direction, the first through hole and the second through hole are connected to form the second mounting hole.

6. The cryogenic distillation tower according to claim 5, characterized in that A recessed area is provided on the top surface of the flange, the first through hole is located in the recessed area, and the support member abuts against the top surface of the recessed area along a vertical direction.

7. The cryogenic distillation tower according to claim 5, characterized in that The cryogenic distillation tower includes a top cover, which is buckled onto the top of the flange and sealed with the flange to form a first installation space together with the flange. The condenser is located in the first installation space.

8. The cryogenic distillation tower according to claim 7, characterized in that An annular sealing groove is provided on the top surface of the flange, the first through hole is located inside the annular sealing groove, a sealing ring is provided in the annular sealing groove, and the top cover is sealed and pressed against the sealing ring.

9. The cryogenic distillation tower according to claim 1, characterized in that The low-temperature distillation tower includes a bottom cover, which is arranged at the bottom of the support assembly and is sealed with the support assembly to form a second installation space together with the support assembly. The distillation column is located in the second installation space, and the bottom cover is provided with an exhaust hole, one end of which is connected to the second installation space.

Images