Device for rectifying and concentrating krypton xenon at low temperature

Abstract

The invention relates to the technical field of krypton and xenon purification, in particular to a device for low-temperature rectification and concentration of krypton and xenon. Comprising a cooling compression tower, a rectifying tower and a purifying tower, mixed gas containing krypton and xenon is cooled and compressed by the cooling compression tower and poured into the rectifying tower, and then nitrogen and oxygen are separated out by the rectifying tower and then flow into the purifying tower; the purifying tower comprises a tower body and a tower base at the bottom of the tower body; an upper baffle plate and a lower baffle plate are arranged in the tower body; a first air outlet groove is formed in the upper baffle disc in an up-down penetrating manner; a first air inlet groove corresponding to the first air outlet groove is formed in the lower baffle disc in an up-down penetrating manner; according to the purification tower disclosed by the invention, the molecular sieves in the separation cavities are driven to rotate between the upper baffle disc and the lower baffle disc through the rotation of the plurality of separation plates, so that the plurality of separation cavities are sequentially communicated with the first gas outlet groove, the blocked molecular sieves can be smoothly replaced, the purification effect of the purification tower on krypton-xenon gas is ensured, and the purity of the krypton-xenon gas is higher.

Description

Technical Field

[0001] The present invention relates to the technical field of krypton and xenon purification, in particular to a device for concentrating krypton and xenon by low-temperature distillation. Background Art

[0002] Krypton and xenon are two rare gases with important applications in industry and scientific research. Krypton is widely used in lighting and laser technology, such as in the manufacture of high-efficiency fluorescent lamps, while xenon is commonly used in medical imaging and ion thrusters.

[0003] In the cryogenic distillation process for krypton-xenon concentration, the krypton-xenon mixture is first cooled and compressed, converting it from a gaseous state to a liquid state. This liquid is then introduced into a distillation tower where it is heated. Due to their relatively low boiling points, nitrogen and oxygen vaporize first during the heating process and migrate upward, while krypton and xenon, with their higher boiling points, remain liquid and migrate downward, achieving initial separation. The krypton-xenon liquid accumulated at the bottom of the distillation tower is directed through a flow diversion device and then enters the vaporization stage. The vaporized gas is further purified by a device equipped with adsorbents such as molecular sieves. However, after prolonged use, adsorbents such as molecular sieves may become saturated with adsorbed impurities and become clogged. This can affect the efficiency of filtration and purification, and consequently, the quality of the krypton-xenon concentration. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, the present invention proposes a device for low-temperature distillation and concentration of krypton and xenon. The present invention rotates multiple partition plates, driving the molecular sieve within the partition chamber to rotate between the upper and lower baffles, thereby connecting the multiple partition chambers in sequence with the first gas outlet slot. This ensures that the blocked molecular sieve can be smoothly replaced, thereby ensuring the purification effect of the purification tower on the krypton and xenon gas, and making the krypton and xenon gas more pure.

[0005] The technical solution adopted by the present invention to solve its technical problems is as follows: a device for low-temperature distillation and concentration of krypton and xenon according to the present invention comprises a cooling and compression tower, a distillation tower and a purification tower; the cooling and compression tower cools and compresses a mixed gas containing krypton and xenon and pours the gas into the distillation tower, whereupon nitrogen and oxygen are separated by the distillation tower and flow into the purification tower; the purification tower comprises a tower body and a tower base at the bottom of the tower body; an upper baffle and a lower baffle are provided inside the tower body; a first gas outlet groove is provided through the upper and lower baffles; a first gas inlet groove corresponding to the first gas outlet groove is provided through the lower and upper baffles; a screen jacket is rotatably connected between the upper and lower baffles; the screen jacket is divided into a plurality of compartments by a partition plate; the cross-section of the compartment chamber is adapted to the cross-section of the first gas outlet groove; the compartment chamber is filled with a molecular sieve; a heating rod is provided inside the tower body and below the lower baffle; a first gas inlet pipe is provided on the lower outer wall of the tower body; and a first gas outlet pipe is provided on the upper outer wall of the tower body.

[0006] Preferably, the upper baffle and the lower baffle pass through the center rod up and down; the center rod is rotatably sealed with the upper baffle and the lower baffle; the center rod is fixedly connected to the partition plate; the rotation of the center rod can drive the rotation of multiple partition chambers; the upper end of the center rod is connected to the fan blade; the fan blade is located directly above the first air outlet groove.

[0007] Preferably, the upper end of the center rod is fixedly connected to the driven gear; a gear rod is vertically provided on the inner wall of the top of the tower body; the gear rod is located directly above the first air outlet groove; the lower end of the gear rod is rotatably connected to the driving gear; the upper end of the center rod is fixedly connected to the driven gear; the driving gear and the driven gear are driven by a chain; the fan blades are fixedly connected to the lower surface of the driving gear through the blade rod.

[0008] Preferably, the number of teeth of the driving gear is smaller than the number of teeth of the driven gear.

[0009] Preferably, the heating rod is fixedly connected to the lower end of the center rod.

[0010] Preferably, a motor is embedded in the upper surface of the tower base and located inside the tower body; and the output shaft of the motor is fixedly connected to the center rod at the lower end.

[0011] Preferably, the upper baffle is provided with a second air outlet groove running through the upper and lower parts; the lower baffle is provided with a second air inlet groove running through the upper and lower parts; the lower surface of the lower baffle is fixedly connected to an air inlet shell connected to the second air inlet groove; a heating wire is provided in the air inlet shell; the air inlet shell is connected to the air pump outside the tower body; the upper surface of the upper baffle is fixedly connected to the air outlet shell; the air outlet shell is connected to the pipeline outside the tower body.

[0012] Preferably, the partition plate is made of heat-insulating material and can isolate the heat in the partition cavity.

[0013] The beneficial effects of the present invention are as follows:

[0014] 1. The present invention rotates multiple partition plates to drive the molecular sieve in the partition chamber to rotate between the upper and lower baffles, thereby connecting the multiple partition chambers to the first gas outlet slot in sequence, thereby ensuring that the blocked molecular sieve can be smoothly replaced, thereby ensuring the purification effect of the purification tower on krypton-xenon gas, and making the krypton-xenon gas higher in purity.

[0015] 2. The present invention provides a fan blade directly above the first air outlet slot, so that the rotation speed of the fan blade increases as the air outlet speed of the first air outlet slot increases, and then the replacement speed of the multiple partition chambers changes with the amount of krypton-xenon gas, further ensuring the filtering effect of the krypton-xenon gas.

[0016] 3. The present invention allows heated external air to pass through the blocked molecular sieve, so that the impurities in the molecular sieve are heated and vaporized, thereby cleaning and unblocking the molecular sieve, thereby ensuring the filtering effect of the molecular sieve and realizing the repeated use of the molecular sieve. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 is a perspective view of the present invention;

[0019] Figure 2 is a cross-sectional view of a purification tower in the present invention;

[0020] Figure 3 1 is a schematic top view of the partition plate and the partition cavity in the present invention;

[0021] Figure 4 It is a structural schematic diagram of the upper baffle in the present invention;

[0022] Figure 5 It is a structural schematic diagram of the lower baffle in the present invention;

[0023] Figure 6 It is a transmission schematic diagram of the driven gear and the driving gear of the present invention.

[0024] In the figure: cooling and compression tower 1, distillation tower 2, purification tower 3, tower body 31, tower base 32, heating rod 33, first air inlet pipe 34, first air outlet pipe 35, motor 36, upper baffle 4, first air outlet groove 41, second air outlet groove 42, air outlet shell 43, lower baffle 5, first air inlet groove 51, second air inlet groove 52, air inlet shell 53, heating wire 54, air pump 55, sieve jacket 6, partition plate 61, partition chamber 62, molecular sieve 63, center rod 7, fan blade 71, driven gear 72, blade rod 73, gear rod 8, driving gear 81, chain 82. DETAILED DESCRIPTION

[0025] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0026] like Figures 1 to 6As shown, the device for low-temperature distillation and concentration of krypton and xenon according to the present invention comprises a cooling and compression tower 1, a distillation tower 2 and a purification tower 3; the cooling and compression tower 1 cools and compresses the mixed gas containing krypton and xenon and pours it into the distillation tower 2, and then the nitrogen and oxygen are separated by the distillation tower 2 and flow into the purification tower 3; the purification tower 3 comprises a tower body 31 and a tower base 32 at the bottom of the tower body 31; an upper baffle 4 and a lower baffle 5 are provided inside the tower body 31; the upper baffle 4 is provided with a first gas outlet slot 41 running through it from top to bottom; the lower baffle 5 is provided with a first gas outlet slot 41 running through it from top to bottom A first air inlet groove 51 corresponding to the first air outlet groove 41 is provided; a screen jacket 6 is rotatably connected between the upper baffle 4 and the lower baffle 5; the screen jacket 6 is divided into multiple separation chambers 62 by a partition plate 61; the cross-section of the separation chamber 62 is adapted to the cross-section of the first air outlet groove 41; the separation chamber 62 is filled with a molecular sieve 63; a heating rod 33 is provided inside the tower body 31 and below the lower baffle 5; a first air inlet pipe 34 is provided on the lower outer wall of the tower body 31; a first air outlet pipe 35 is provided on the upper outer wall of the tower body 31.

[0027] As an embodiment of the present invention, the upper baffle 4 and the lower baffle 5 pass through the center rod 7 up and down; the center rod 7 is rotatably sealed and connected to the upper baffle 4 and the lower baffle 5; the center rod 7 is fixedly connected to the partition plate 61; the rotation of the center rod 7 can drive the rotation of multiple partition chambers 62; the upper end of the center rod 7 is connected to the fan blade 71; the fan blade 71 is located directly above the first air outlet groove 41.

[0028] As an embodiment of the present invention, the upper end of the center rod 7 is fixedly connected to the driven gear 72; a gear rod 8 is vertically provided on the top inner wall of the tower body 31; the gear rod 8 is located directly above the first air outlet groove 41; the gear rod 8 is rotatably connected to the driving gear 81 at the lower end; the upper end of the center rod 7 is fixedly connected to the driven gear 72; the driving gear 81 and the driven gear 72 are transmitted by a chain 82; the fan blade 71 is fixedly connected to the lower surface of the driving gear 81 through the blade rod 73.

[0029] As an embodiment of the present invention, the number of teeth of the driving gear 81 is smaller than the number of teeth of the driven gear 72 .

[0030] As an embodiment of the present invention, the heating rod 33 is fixedly connected to the lower end of the center rod 7.

[0031] As an embodiment of the present invention, a motor 36 is embedded in the upper surface of the tower base 32 and located inside the tower body 31 ; the output shaft of the motor 36 is fixedly connected to the center rod 7 at the lower end.

[0032] As an embodiment of the present invention, the upper baffle plate 4 is provided with a second air outlet groove 42 running through it from top to bottom; the lower baffle plate 5 is provided with a second air inlet groove 52 running through it from top to bottom; the lower surface of the lower baffle plate 5 is fixedly connected to an air inlet shell 53 connected to the second air inlet groove 52; a heating wire 54 is provided in the air inlet shell 53; the air inlet shell 53 is connected to the air pump 55 on the outside of the tower body 31; the upper surface of the upper baffle plate 4 is fixedly connected to the air outlet shell 43; the air outlet shell 43 is connected to the pipeline on the outside of the tower body 31.

[0033] As an embodiment of the present invention, the partition plate 61 is made of a heat-insulating material and can isolate the heat in the partition cavity 62 .

[0034] The specific workflow is as follows:

[0035] First, a gas mixture containing krypton and xenon is introduced into a cooling and compression tower 1 for cooling and compression, converting the gas mixture from a gaseous state to a liquid state. The liquid is then introduced into a distillation tower 2, where it is heated. Nitrogen and oxygen, due to their relatively low boiling points, vaporize and rise first, while krypton and xenon, due to their higher boiling points, remain in a liquid state and move downward, achieving preliminary separation. The liquid krypton and xenon enter the lower portion of the tower body 31 through a first inlet pipe 34 of the tower body 31, where they come into contact with a heater rod 33 at the bottom of the tower body 31. The heater rod 33 is electrically heated, and the heated and vaporized krypton and xenon liquids pass from bottom to top through the first inlet slot 51 of the lower baffle plate 5 and into a partition chamber 62. The partition chamber 62 contains a molecular sieve 63, filtering impurities from the krypton and xenon gases. The filtered krypton and xenon gases then pass through the first outlet slot 41 of the upper baffle plate 4 and into the top portion of the tower body 31, where they are finally discharged through the first outlet pipe 35.

[0036] As the filtered krypton-xenon gas is discharged upward along the first gas outlet slot 41, it impacts the fan blades 71, causing them to rotate. The rotation of the fan blades 71 drives the blade rod 73, which in turn drives the driving gear 81. The driving gear 81 then rotates the driven gear 72 via a chain 82. Because the number of teeth on the driving gear 81 is much smaller than that on the driven gear 72, the driving gear 81 can drive the driven gear 72 with less effort. The rotation of the driven gear 72 drives the center rod 7, which in turn drives the multiple partition plates 61. The rotation of the partition plates 61 drives the partition chamber 62. The partition chamber 62 is divided into multiple chambers by the partition plates 61, each filled with molecular sieves 63. As the center rod 7 rotates, the multiple partition chambers 62 alternately connect to the first gas outlet slot 41. In this way, the molecular sieve 63 that is connected to the first gas inlet slot 51 and has been saturated or blocked by the filtration is removed as the center rod 7 rotates, and the new molecular sieve 63 moves to a position connected to the first gas outlet slot 41, thereby ensuring the molecular sieve 63's filtering effect on the krypton-xenon gas.

[0037] The rotation of the center rod 7 is driven by the fan blades 71. When the power is insufficient, the motor 36 is triggered to drive it to rotate. During the rotation, the partition plate 61 is driven to rotate and part of the power is transmitted to the heating rod 33, stirring the krypton-xenon liquid at the bottom of the tower body 31, increasing the contact area and improving the gasification efficiency; at the same time, when the center rod 7 rotates, the air pump 55 works to introduce external gas into the air inlet shell 53. The air inlet shell 53 is directly below the lower baffle 5 and is connected to the second air inlet groove 52. There is an energized heating wire 54 in the shell. After the gas is heated, it enters the connected partition chamber 62 along the second air inlet groove 52, heats the used molecular sieve 63 to vaporize impurities, and the vaporized impurities are discharged along the second air outlet groove 42 to the air outlet shell 43 and then to the outer pipe of the tower body 31; when the gas passes through the used molecular sieve 63, multiple partition plates 61 separate the molecular sieves 63 in each chamber, ensuring that the krypton-xenon gas in the tower is not connected to other unactivated molecular cavities, thereby ensuring the purity of the krypton-xenon gas.

[0038] The present invention rotates the plurality of partition plates 61 to drive the molecular sieve 63 in the partition chamber 62 to rotate between the upper baffle plate 4 and the lower baffle plate 5, thereby sequentially connecting the plurality of partition chambers 62 to the first gas outlet slot 41. This ensures that the blocked molecular sieve 63 can be smoothly replaced, thereby ensuring the purification effect of the purification tower 3 on the krypton-xenon gas, and making the krypton-xenon gas more pure.

[0039] The present invention provides a fan blade 71 directly above the first gas outlet slot 41, so that the rotation speed of the fan blade 71 increases as the gas outlet velocity of the first gas outlet slot 41 increases. This in turn causes the replacement speed of the multiple partition chambers 62 to change with the amount of krypton-xenon gas, further ensuring the filtering effect of the krypton-xenon gas.

[0040] The present invention allows heated external air to pass through the blocked molecular sieve 63, so that impurities in the molecular sieve 63 are heated and gasified, thereby cleaning and unblocking the molecular sieve 63, thereby ensuring the filtering effect of the molecular sieve 63 and realizing the repeated use of the molecular sieve 63.

[0041] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate directions or positional relationships based on the attached Figure 1 The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as limiting the scope of protection of the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0042] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for cryogenically distilling and concentrating krypton and xenon, comprising a cooling and compression tower, a distillation tower, and a purification tower; the cooling and compression tower cools and compresses a mixed gas containing krypton and xenon, which is then poured into the distillation tower, where nitrogen and oxygen are separated and then flow into the purification tower; the device is characterized by: The purification tower includes a tower body and a tower base at the bottom of the tower body; an upper baffle and a lower baffle are provided inside the tower body; a first air outlet groove is provided through the upper and lower parts of the upper baffle; a first air inlet groove corresponding to the first air outlet groove is provided through the upper and lower parts of the lower baffle; a screen jacket is rotatably connected between the upper and lower baffles; the screen jacket is divided into multiple separation chambers by a separation plate; the cross-section of the separation chamber is adapted to the cross-section of the first air outlet groove; the separation chamber is filled with molecular sieves; a heating rod is provided inside the tower body and below the lower baffle; a first air inlet pipe is provided on the lower outer wall of the tower body; and a first air outlet pipe is provided on the upper outer wall of the tower body.

2. The apparatus for cryogenic distillation concentration of krypton and xenon according to claim 1, characterized in that: The upper baffle and the lower baffle pass through the center rod up and down; the center rod is rotatably and sealedly connected to the upper baffle and the lower baffle; the center rod is fixedly connected to the partition plate; the rotation of the center rod can drive the rotation of multiple partition chambers; the upper end of the center rod is connected to the fan blade; the fan blade is located directly above the first air outlet groove.

3. The apparatus for cryogenic distillation concentration of krypton and xenon according to claim 2, characterized in that: The upper end of the center rod is fixedly connected to the driven gear; a gear rod is vertically provided on the inner wall of the top of the tower body; the gear rod is located directly above the first air outlet groove; the lower end of the gear rod is rotatably connected to the driving gear; the upper end of the center rod is fixedly connected to the driven gear; the driving gear and the driven gear are driven by a chain; the fan blades are fixedly connected to the lower surface of the driving gear through the blade rod.

4. The apparatus for cryogenic distillation concentration of krypton and xenon according to claim 3, characterized in that: The number of teeth of the driving gear is smaller than the number of teeth of the driven gear.

5. The apparatus for cryogenic distillation and concentration of krypton and xenon according to claim 2, characterized in that: The heating rod is fixedly connected to the lower end of the center rod.

6. The apparatus for cryogenic distillation concentration of krypton and xenon according to claim 2, characterized in that: A motor is embedded in the upper surface of the tower base and located inside the tower body; and an output shaft of the motor is fixedly connected to the lower end of the center rod.

7. The apparatus for cryogenic distillation concentration of krypton and xenon according to claim 1, characterized in that: The upper baffle is provided with a second air outlet groove running through it from top to bottom; the lower baffle is provided with a second air inlet groove running through it from top to bottom; the lower surface of the lower baffle is fixedly connected to an air inlet shell connected to the second air inlet groove; a heating wire is provided in the air inlet shell; the air inlet shell is connected to the air pump outside the tower body; the upper surface of the upper baffle is fixedly connected to the air outlet shell; the air outlet shell is connected to the pipeline outside the tower body.

8. The apparatus for cryogenic distillation concentration of krypton and xenon according to claim 1, characterized in that: The partition plate is made of heat-insulating material and can isolate the heat in the partition cavity.

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