A krypton-xenon extraction device and a krypton-xenon extraction method based on the device

Abstract

The present invention provides a krypton-xenon extraction device and a krypton-xenon extraction method based on the device, belonging to the technical field of gas extraction equipment. The device comprises a first reaction tower, a second reaction tower, a third reaction tower, a fourth reaction tower, and a fifth reaction tower, which are sequentially connected by pipelines. The refrigerant inlet of the first condenser-evaporator is connected to a liquid nitrogen pipeline. The first condenser-evaporator is connected to the second and third condenser-evaporators, respectively, and to a nitrogen discharge pipeline via pipelines. The second and third refrigerant discharge pipelines of the second and third condenser-evaporators are connected to the fourth and fifth condenser-evaporators, respectively, and to a nitrogen discharge pipeline. The fourth and fourth refrigerant discharge pipelines of the fourth and fifth condenser-evaporators are connected to a nitrogen discharge pipeline. This device effectively reuses low-temperature nitrogen, reduces nitrogen usage during the extraction process, and lowers extraction costs.

Description

Technical Field

[0001] The invention relates to a krypton-xenon extraction device and a krypton-xenon extraction method based on the device, belonging to the technical field of gas extraction equipment. Background Art

[0002] The content of krypton and xenon in the atmosphere is about 1.14×10 -6 and 0.086×10 -6 The high boiling point components krypton, xenon, hydrocarbons (mainly methane) and fluorides are accumulated in the liquid oxygen in the lower tower of the air separation equipment. The liquid oxygen in the low pressure tower is sent to the krypton-xenon pre-concentration distillation tower for distillation. The krypton-xenon in the air is concentrated to 500 to 3000×10 -6 The product is then pressurized, vaporized, and heated to catalytically remove methane and other hydrocarbons. CO2 and water are removed by an adsorber before entering a krypton-xenon separation unit for separation and purification. The Chinese patent application number, CN200910198684.X, entitled "A Method for Extracting Krypton and Xenon from Liquid Oxygen," proposes using liquid nitrogen and nitrogen gas as the low-temperature cooling source for the krypton-xenon separation unit. However, this patent uses nitrogen evaporated from the condenser-evaporator of the first-stage distillation column as the cooling source for the condensers of the third, fourth, fifth, and sixth stages. The ambient-temperature nitrogen used for temperature control of the condensers is also directly connected to the inlet of each distillation column. This cooling source configuration requires the use of additional hot nitrogen to mix the low-temperature nitrogen (>-130°C) to serve as the cooling source for the condensers of the fifth and sixth stages. The -130 to -140℃ low-temperature nitrogen coming out of the third and fourth condenser evaporators is not fully utilized as the cold source for the fifth and sixth-stage distillation tower condenser evaporators, but is directly returned to the main heat exchanger for reheating. This results in the need to consume more cold sources and more room-temperature nitrogen. For a low-carbon circular economy, it is obviously necessary to further optimize the utilization of cold energy. Summary of the Invention

[0003] In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a krypton-xenon extraction device and a krypton-xenon extraction method based on the device, so as to solve the problems in the prior art that the existing devices for extracting krypton and xenon from liquid oxygen require more cold sources and more room-temperature nitrogen, resulting in low energy utilization, high reaction costs, and easy waste of resources.

[0004] To achieve the above-mentioned and other related objects, the present invention provides a krypton-xenon extraction device, comprising a first reaction tower, a second reaction tower, a third reaction tower, a fourth reaction tower, and a fifth reaction tower, which are sequentially connected through pipelines for extraction operations. The first reaction tower, the second reaction tower, the third reaction tower, the fourth reaction tower, and the fifth reaction tower are respectively connected to a first condenser-evaporator, a second condenser-evaporator, a third condenser-evaporator, a fourth condenser-evaporator, and a fifth condenser-evaporator above, and are respectively connected to a first reboiler, a second reboiler, a third reboiler, a fourth reboiler, and a fifth reboiler below, the refrigerant inlet of the first condenser-evaporator is connected to a liquid nitrogen pipeline, and the refrigerant inlet of the first condenser-evaporator is connected to a liquid nitrogen pipeline. The first refrigerant discharge pipe is respectively connected to the refrigerant inlet and the nitrogen discharge pipe of the second condenser evaporator and the third condenser evaporator. The refrigerant inlet of the second condenser evaporator and the third condenser evaporator is also connected to the first nitrogen pipe. The second refrigerant discharge pipe and the third refrigerant discharge pipe of the second condenser evaporator and the third condenser evaporator are respectively connected to the refrigerant inlet and the nitrogen discharge pipe of the fourth condenser evaporator and the fifth condenser evaporator. The refrigerant inlet of the fourth condenser evaporator and the fifth condenser evaporator is also connected to the second nitrogen pipe. The fourth refrigerant discharge pipe and the fourth refrigerant discharge pipe of the fourth condenser evaporator and the fifth condenser evaporator are connected to the nitrogen discharge pipe.

[0005] In one embodiment of the present invention, the first reaction tower is connected to the feed pipeline, the first reaction tower is connected to the liquid oxygen discharge pipeline through the first condenser-evaporator above the first reaction tower, the first reboiler below the first reaction tower is connected to the second reaction tower through the first delivery pipeline, the second condenser-evaporator above the second reaction tower is connected to the third reaction tower through the fourth delivery pipeline, the second reboiler below the second reaction tower is connected to the fourth reaction tower through the second delivery pipeline, the fourth condenser-evaporator above the fourth reaction tower is connected to the fifth reaction tower through the third delivery pipeline, and the fifth condenser-evaporator above the fifth reaction tower is connected to the recovery pipeline.

[0006] In one embodiment of the present invention, the third condenser evaporator above the third reaction tower is connected to the krypton gas collecting device through a pipeline.

[0007] In one embodiment of the present invention, the fifth reboiler below the fifth reaction tower is connected to a xenon gas collecting device through a pipeline.

[0008] In one embodiment of the present invention, condensers are provided in the feed pipe, the liquid oxygen discharge pipe, and the nitrogen discharge pipe.

[0009] In one embodiment of the present invention, a vent pipe is connected to the lower portion of the third reboiler below the third reaction tower and the lower portion of the fourth reboiler below the fourth reaction tower.

[0010] A krypton-xenon extraction method based on the krypton-xenon extraction device comprises the following steps:

[0011] S1. The oxygen containing krypton and xenon components from which hydrocarbons, carbon dioxide and water have been removed or the concentrated krypton and xenon concentrate is fed into the middle of the first reaction tower (10) for distillation separation. A krypton and xenon concentrate with Kr+Xe>99.9% is obtained at the bottom of the tower, and liquid oxygen and oxygen with Kr+Xe<0.1% are obtained at the top of the tower. The liquid nitrogen is throttled and fed into the first condenser evaporator (9) to evaporate into low-temperature nitrogen gas. The oxygen at the top of the tower is partially condensed into liquid oxygen as the reflux liquid of the first reaction tower (10).

[0012] S2. The krypton-xenon concentrate obtained in step S1 is fed into the middle of a second reaction tower (13) for distillation separation. Crude krypton is obtained at the top of the tower, and crude xenon is obtained at the bottom of the tower. The low-temperature nitrogen evaporated in the first condenser-evaporator (9) is mixed with the room-temperature nitrogen and then fed into a second condenser-evaporator (34) to condense the crude krypton.

[0013] S3, the crude krypton obtained at the top of the tower in step S2 is sent to the third reaction tower (15) for distillation separation, and high-purity krypton with a molar content of not less than 99.999% is obtained at the top of the tower. The low-temperature nitrogen evaporated in the first condenser evaporator (9) is mixed with the room-temperature nitrogen and then enters the third condenser evaporator (27) to condense the high-purity krypton;

[0014] S4, the crude xenon obtained at the bottom of the tower in step S2 is sent to the fourth reaction tower (21) for distillation separation, and crude xenon with a molar content of not less than 99.9% is obtained at the top of the tower. The low-temperature nitrogen evaporated in the second condenser-evaporator (34) and the third condenser-evaporator (27) is mixed with the room-temperature nitrogen and then enters the fourth condenser-evaporator (28) to condense the crude xenon;

[0015] S5. The crude xenon with a molar content of not less than 99.9% obtained at the top of the tower in step S4 is fed into a fifth reaction tower (23) for distillation separation, and high-purity xenon with a molar content of not less than 99.999% is obtained at the bottom of the tower. The low-temperature nitrogen evaporated in the second condenser-evaporator (34) and the third condenser-evaporator (27) is mixed with the room-temperature nitrogen and then fed into the fifth condenser-evaporator (29) to condense the high-purity xenon.

[0016] In one embodiment of the present invention, a portion of the low-temperature nitrogen evaporated in the first condenser evaporator (9) is mixed with the room-temperature nitrogen and then enters the second condenser evaporator (34) and the third condenser evaporator (27), while the other portion is decompressed by a valve and discharged through the nitrogen discharge pipe (4).

[0017] In one embodiment of the present invention, part of the low-temperature nitrogen evaporated in the second condenser-evaporator (34) and the third condenser-evaporator (27) is mixed with the room-temperature nitrogen and then enters the fourth condenser-evaporator (28) and the fifth condenser-evaporator (29), and the other part is decompressed by a valve and discharged through the nitrogen discharge pipe (4).

[0018] In one embodiment of the present invention, the low-temperature nitrogen gas evaporated in the fourth condenser-evaporator (28) and the fifth condenser-evaporator (29) is discharged through the nitrogen discharge pipe (4).

[0019] As described above, the krypton-xenon extraction device and the krypton-xenon extraction method based on the device of the present invention have the following beneficial effects:

[0020] (1) In the present invention, the low-temperature nitrogen gas condensed and evaporated in the first condenser-evaporator is transported to the second condenser-evaporator and the third condenser-evaporator as a refrigerant, and then the low-temperature nitrogen gas condensed and evaporated in the second condenser-evaporator and the third condenser-evaporator is transported to the fourth condenser-evaporator and the fifth condenser-evaporator as a refrigerant, thereby effectively realizing the reuse of the low-temperature nitrogen gas, reducing the amount of nitrogen used in the extraction process, reducing the extraction cost, and saving energy;

[0021] (2) In the present invention, the low-temperature nitrogen gas condensed and evaporated in the second condenser-evaporator and the third condenser-evaporator is transported to the fourth condenser-evaporator and the fifth condenser-evaporator as a refrigerant. The temperature difference between the cold source in the fourth condenser-evaporator and the liquefaction point of the xenon gas is small, and the high-boiling-point low-temperature xenon gas is not easy to solidify during the distillation process, resulting in a good distillation effect and high efficiency.

[0022] (3) The present invention has a simple overall structure, requires few devices, occupies a small area, and is easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Shown is a schematic diagram of the composition of a krypton-xenon extraction device according to an embodiment of the present invention.

[0024] Among them, 1. feed pipeline; 2. liquid oxygen discharge pipeline; 3. condenser; 4. nitrogen discharge pipeline; 5. liquid nitrogen pipeline; 6. first refrigerant discharge pipeline; 7. first nitrogen pipeline; 8. second nitrogen pipeline; 9. first condenser evaporator; 10. first reaction tower; 11. first reboiler; 12. first conveying pipeline; 13. second reaction tower; 14. second conveying pipeline; 15. third reaction tower; 16. second refrigerant discharge pipeline; 17. third refrigerant discharge pipeline; 18. Fourth refrigerant discharge pipe; 19. Fifth refrigerant discharge pipe; 20. Recovery pipe; 21. Fourth reaction tower; 22. Third delivery pipe; 23. Fifth reaction tower; 24. Krypton gas collection device; 25. Xenon gas collection device; 26. Fourth delivery pipe; 27. Third condenser-evaporator; 28. Fourth condenser-evaporator; 29. ​​Fifth condenser-evaporator; 30. Second reboiler; 31. Third reboiler; 32. Fourth reboiler; 33. Fifth reboiler; 34. Second condenser-evaporator. DETAILED DESCRIPTION

[0025] The following describes the implementation of the present invention through specific embodiments. People skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0026] See also Figure 1 . It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention. Therefore, they have no substantive technical significance. Any modification of the structure, change in the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the efficacy and purpose that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0027] See also Figure 1The present invention provides a krypton-xenon extraction device, comprising a first reaction tower 10, a second reaction tower 13, a third reaction tower 15, a fourth reaction tower 21 and a fifth reaction tower 23, which are sequentially connected through pipelines for extraction operations. The first reaction tower 10, the second reaction tower 13, the third reaction tower 15, the fourth reaction tower 21 and the fifth reaction tower 23 are respectively connected to a first condenser evaporator 9, a second condenser evaporator 34, a third condenser evaporator 27, a fourth condenser evaporator 28 and a fifth condenser evaporator 29 above, and are respectively connected to a first reboiler 11, a second reboiler 30, a third reboiler 31, a fourth reboiler 32 and a fifth reboiler 33 below ... The tower 10 is connected to the feed pipeline 1, the first reaction tower 10 is connected to the liquid oxygen discharge pipeline 2 through the first condenser evaporator 9 above, the first reboiler 11 below the first reaction tower 10 is connected to the second reaction tower 13 through the first conveying pipeline 12, the second condenser evaporator 34 above the second reaction tower 13 is connected to the third reaction tower 15 through the fourth conveying pipeline 26, the second reboiler 30 below the second reaction tower 13 is connected to the fourth reaction tower 21 through the second conveying pipeline 14, the fourth condenser evaporator 28 above the fourth reaction tower 21 is connected to the fifth reaction tower 23 through the third conveying pipeline 22, the fourth reboiler 31 below the fourth reaction tower 21 is connected to the vent pipeline, and the fifth The fifth condenser evaporator 29 above the reaction tower 23 is connected to the recovery pipe 20, the refrigerant inlet of the first condenser evaporator 9 is connected to the liquid nitrogen pipe 5, the first refrigerant discharge pipe 6 in the first condenser evaporator 9 is respectively connected to the refrigerant inlet of the second condenser evaporator 34 and the third condenser evaporator 27 and the nitrogen discharge pipe 4, the refrigerant inlet of the second condenser evaporator 34 and the third condenser evaporator 27 is also connected to the first nitrogen pipe 7, the second refrigerant discharge pipe 16 and the third refrigerant discharge pipe 17 in the second condenser evaporator 34 and the third condenser evaporator 27 are respectively connected to the refrigerant inlet of the fourth condenser evaporator 28 and the fifth condenser evaporator 29 and the nitrogen discharge pipe 4. The refrigerant inlets of the fourth condenser evaporator 28 and the fifth condenser evaporator 29 are also connected to the second nitrogen pipeline 8, the fourth refrigerant discharge pipeline 18 and the fourth refrigerant discharge pipeline 19 in the fourth condenser evaporator 28 and the fifth condenser evaporator 29 are connected to the nitrogen discharge pipeline 4, the third condenser evaporator 27 above the third reaction tower 15 is connected to the krypton gas collecting device 24 through a pipeline, the third reboiler 31 below the third reaction tower 15 is connected to the vent pipeline, and the fifth reboiler 33 below the fifth reaction tower 23 is connected to the xenon gas collecting device 25 through a pipeline. A condenser 3 is provided in the feed pipeline 1, the liquid oxygen discharge pipeline 2 and the nitrogen discharge pipeline 4.

[0028] A krypton-xenon extraction device is used in an application method. The krypton-xenon-containing oxygen or concentrated krypton-xenon concentrate, from which hydrocarbons, carbon dioxide, and water have been removed, is fed through a feed pipe 1 into the middle of a first reaction tower 10 for distillation separation. A krypton-xenon concentrate with a Kr+Xe ratio greater than 99.9% is obtained at the bottom of the tower, and liquid oxygen and oxygen with a Kr+Xe ratio less than 0.1% are obtained at the top of the tower. The liquid nitrogen, after throttling, passes through a liquid nitrogen pipe 5 and enters a first condenser evaporator 9 at the top of the tower, where it evaporates into low-temperature nitrogen gas. The oxygen at the top of the tower is partially condensed into liquid oxygen and discharged through a liquid oxygen discharge pipe 2.

[0029] The krypton-xenon concentrate obtained at the bottom of the tower is transported to the second reaction tower 13 through the first reboiler 11 and the first transport pipeline 12 for distillation separation. Crude krypton is obtained at the top of the second reaction tower 13, and crude xenon is obtained at the bottom of the tower.

[0030] The crude krypton is transported to the third reaction tower 15 via the second condenser evaporator 34 and the fourth delivery pipeline 26 for distillation separation. High-purity krypton with a molar content of not less than 99.999% is obtained at the top of the third reaction tower 15. The high-purity krypton is condensed in the third condenser evaporator 27 and then transported to the krypton gas collection device for collection.

[0031] The crude xenon is transported to the fourth reaction tower 21 through the second reboiler 30 and the second transport pipeline 14 for distillation separation, and crude xenon with a molar content of not less than 99.9% is obtained at the top of the fourth reaction tower;

[0032] The crude xenon is then transported through the fourth condenser evaporator 28 above the fourth reaction tower 21 and the third delivery pipeline 22 to the fifth reaction tower 23 for distillation separation. High-purity xenon with a molar content of not less than 99.999% is obtained at the bottom of the tower. The high-purity xenon is then transported to the xenon gas collection device 25 for storage after passing through the fifth reboiler 33.

[0033] During the distillation separation process, liquid nitrogen enters the first condenser-evaporator 9 through the liquid nitrogen pipeline 5. Part of the low-temperature nitrogen formed after evaporation in the first condenser-evaporator 9 is discharged through the nitrogen discharge pipeline 4, and the other part is mixed with the room-temperature nitrogen in the first nitrogen pipeline 7 through the first refrigerant discharge pipeline 6 and then transported to the second condenser-evaporator 13 and the third condenser-evaporator 15 as a refrigerant for condensation and evaporation. The low-temperature nitrogen after condensation and evaporation in the second condenser-evaporator 13 and the third condenser-evaporator 15 is mixed with the room-temperature nitrogen in the second nitrogen pipeline 8 through the second refrigerant discharge pipeline 16 and the third refrigerant discharge pipeline 17 and then transported to the fourth condenser-evaporator 28 and the fifth condenser-evaporator 29 as a refrigerant for condensation and evaporation. The room-temperature nitrogen after condensation and evaporation is transported to the nitrogen discharge pipeline 4 through the fourth refrigerant discharge pipeline 18 and the fifth refrigerant discharge pipeline 19 for discharge.

[0034] A krypton-xenon extraction method based on a krypton-xenon extraction device, comprising the following steps:

[0035] S1. The oxygen containing krypton and xenon components, from which hydrocarbons, carbon dioxide, and water have been removed, or the concentrated krypton and xenon concentrate is fed into the middle portion of a first reaction tower 10 for distillation separation. A krypton and xenon concentrate having Kr+Xe>99.9% is obtained at the bottom of the tower, and liquid oxygen and oxygen substantially free of krypton and xenon are obtained at the top of the tower. The liquid nitrogen is throttled and fed into a first condenser evaporator 9 to evaporate into low-temperature nitrogen gas. The oxygen at the top of the tower is partially condensed into liquid oxygen as reflux liquid for the first reaction tower 10.

[0036] S2. The krypton-xenon concentrate obtained in step S1 is fed into the middle portion of a second reaction tower 13 for distillation separation. Crude krypton is obtained at the top of the tower, and crude xenon is obtained at the bottom of the tower. A portion of the low-temperature nitrogen evaporated in the first condenser-evaporator 9 is mixed with the room-temperature nitrogen and then fed into the second condenser-evaporator 34 to condense the crude krypton. The remaining portion is depressurized by a valve and discharged through a nitrogen discharge pipe 4.

[0037] S3. The crude krypton obtained at the top of step S2 is fed into a third reaction tower 15 for rectification and separation. High-purity krypton with a molar content of not less than 99.999% is obtained at the top of the tower. A portion of the low-temperature nitrogen evaporated in the first condenser-evaporator 9 is mixed with the room-temperature nitrogen and then fed into the third condenser-evaporator 27 to condense the high-purity krypton. The remaining portion is decompressed by a valve and discharged through the nitrogen discharge pipe 4.

[0038] S4. The crude xenon obtained at the bottom of step S2 is fed into a fourth reaction tower 21 for distillation separation. A crude xenon having a molar content of not less than 99.9% is obtained at the top of the tower. A portion of the low-temperature nitrogen evaporated in the second condenser-evaporator 34 and the third condenser-evaporator 27 is mixed with the room-temperature nitrogen and then fed into the fourth condenser-evaporator 28 to condense the crude xenon. The remaining portion is depressurized by a valve and discharged through a nitrogen discharge pipe 4. The low-temperature nitrogen evaporated in the fourth condenser-evaporator 28 is depressurized by a valve and discharged through a nitrogen discharge pipe 4.

[0039] S5. The crude xenon with a molar content of not less than 99.9% obtained at the top of step S4 is fed into the fifth reaction tower 23 for distillation separation, and high-purity xenon with a molar content of not less than 99.999% is obtained at the bottom of the tower. A portion of the low-temperature nitrogen evaporated in the second condenser-evaporator 34 and the third condenser-evaporator 27 is mixed with the room-temperature nitrogen and then enters the fifth condenser-evaporator 29 to condense the high-purity xenon. The remaining portion is depressurized by a valve and discharged through the nitrogen discharge pipe 4. The low-temperature nitrogen evaporated in the fifth condenser-evaporator 29 is depressurized by a valve and discharged through the nitrogen discharge pipe 4.

[0040] In summary, in the present invention, the low-temperature nitrogen gas condensed and evaporated in the first condenser-evaporator is transported to the second condenser-evaporator and the third condenser-evaporator as a refrigerant, and then the low-temperature nitrogen gas condensed and evaporated in the second condenser-evaporator and the third condenser-evaporator is transported to the fourth condenser-evaporator and the fifth condenser-evaporator as a refrigerant, effectively realizing the reuse of the low-temperature nitrogen gas, reducing the amount of nitrogen used in the extraction process, reducing the extraction cost, and saving energy; in the present invention, the low-temperature nitrogen gas condensed and evaporated in the second condenser-evaporator and the third condenser-evaporator is transported to the fourth condenser-evaporator and the fifth condenser-evaporator as a refrigerant, the temperature difference between the cold source in the fourth condenser-evaporator and the liquefaction point of the xenon gas is small, the high-boiling-point low-temperature xenon gas is not easily solidified during the distillation process, the distillation effect is good, and the efficiency is high; the overall structure of the present invention is simple, the equipment used is small, the occupied area is small, and it is easy to use. Therefore, the present invention effectively overcomes the various shortcomings of the prior art and has high industrial utilization value.

[0041] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A krypton-xenon extraction device, comprising a first reaction tower (10), a second reaction tower (13), a third reaction tower (15), a fourth reaction tower (21), and a fifth reaction tower (23) connected in sequence through pipelines for extraction operations, wherein the first reaction tower (10), the second reaction tower (13), the third reaction tower (15), the fourth reaction tower (21), and the fifth reaction tower (23) are connected to a first condenser-evaporator (9), a second condenser-evaporator (34), a third condenser-evaporator (27), a fourth condenser-evaporator (28), and a fifth condenser-evaporator (29) at the top, and are connected to a first reboiler (11), a second reboiler (30), a third reboiler (31), a fourth reboiler (32), and a fifth reboiler (33) at the bottom, characterized in that: The refrigerant inlet of the first condenser evaporator (9) is connected to the liquid nitrogen pipeline (5); the first refrigerant discharge pipeline (6) in the first condenser evaporator (9) is respectively connected to the refrigerant inlets of the second condenser evaporator (34) and the third condenser evaporator (27) and the nitrogen discharge pipeline (4); the refrigerant inlets of the second condenser evaporator (34) and the third condenser evaporator (27) are also connected to the first nitrogen pipeline (7); the second refrigerant discharge pipeline (16) and the third refrigerant discharge pipeline (17) in the second condenser evaporator (34) and the third condenser evaporator (27) are respectively connected to the refrigerant inlets of the fourth condenser evaporator (28) and the fifth condenser evaporator (29) and the nitrogen discharge pipeline (4); the refrigerant inlets of the fourth condenser evaporator (28) and the fifth condenser evaporator (29) are also connected to the second nitrogen pipeline (8); the fourth refrigerant discharge pipeline (18) and the fourth refrigerant discharge pipeline (19) in the fourth condenser evaporator (28) and the fifth condenser evaporator (29) are connected to the nitrogen discharge pipeline (4).

2. The krypton-xenon extraction device according to claim 1, characterized in that: The first reaction tower (10) is connected to the feed pipeline (1), the first reaction tower (10) is connected to the liquid oxygen discharge pipeline (2) through the first condenser evaporator (9) above, the first reboiler (11) below the first reaction tower (10) is connected to the second reaction tower (13) through the first conveying pipeline (12), the second condenser evaporator (34) above the second reaction tower (13) is connected to the third reaction tower (15) through the fourth conveying pipeline (26), the second reboiler (30) below the second reaction tower (13) is connected to the fourth reaction tower (21) through the second conveying pipeline (14), the fourth condenser evaporator (28) above the fourth reaction tower (21) is connected to the fifth reaction tower (23) through the third conveying pipeline (22), and the fifth condenser evaporator (29) above the fifth reaction tower (23) is connected to the recovery pipeline (20).

3. The krypton-xenon extraction device according to claim 2, characterized in that: The third condenser evaporator (27) above the third reaction tower (15) is connected to the krypton gas collecting device (24) through a pipeline.

4. The krypton-xenon extraction device according to claim 2, characterized in that: The fifth reboiler (33) below the fifth reaction tower (23) is connected to the xenon gas collecting device (25) through a pipeline.

5. The krypton-xenon extraction device according to claim 2, characterized in that: Condensers (3) are provided in the feed pipe (1), the liquid oxygen discharge pipe (2) and the nitrogen discharge pipe (4).

6. The krypton-xenon extraction device according to claim 1, characterized in that: The lower portion of the third reboiler (31) below the third reaction tower (15) and the lower portion of the fourth reboiler (31) below the fourth reaction tower (21) are both connected to vent pipes.

7. A krypton-xenon extraction method based on the krypton-xenon extraction device according to any one of claims 1 to 6, characterized in that the steps include: S1. The oxygen containing krypton and xenon components from which hydrocarbons, carbon dioxide and water have been removed or the concentrated krypton and xenon concentrate is fed into the middle of a first reaction tower (10) for distillation separation. A krypton and xenon concentrate having a molar percentage of Kr+Xe>99.9% is obtained at the bottom of the tower, and liquid oxygen and oxygen having a molar percentage of Kr+Xe<0.1% are obtained at the top of the tower. The liquid nitrogen is throttled and fed into a first condenser evaporator (9) to evaporate into low-temperature nitrogen gas. The oxygen at the top of the tower is partially condensed into liquid oxygen as reflux liquid for the first reaction tower (10). S2. The krypton-xenon concentrate obtained in step S1 is fed into the middle of a second reaction tower (13) for distillation separation. Crude krypton is obtained at the top of the tower, and crude xenon is obtained at the bottom of the tower. The low-temperature nitrogen evaporated in the first condenser-evaporator (9) is mixed with the room-temperature nitrogen and then fed into a second condenser-evaporator (34) to condense the crude krypton. S3, the crude krypton obtained at the top of the tower in step S2 is sent to the third reaction tower (15) for distillation separation, and high-purity krypton with a molar content of not less than 99.999% is obtained at the top of the tower. The low-temperature nitrogen evaporated in the first condenser evaporator (9) is mixed with the room-temperature nitrogen and then enters the third condenser evaporator (27) to condense the high-purity krypton; S4, the crude xenon obtained at the bottom of the tower in step S2 is sent to the fourth reaction tower (21) for distillation separation, and crude xenon with a molar content of not less than 99.9% is obtained at the top of the tower. The low-temperature nitrogen evaporated in the second condenser-evaporator (34) and the third condenser-evaporator (27) is mixed with the room-temperature nitrogen and then enters the fourth condenser-evaporator (28) to condense the crude xenon; S5. The crude xenon with a molar content of not less than 99.9% obtained at the top of the tower in step S4 is fed into a fifth reaction tower (23) for distillation separation, and high-purity xenon with a molar content of not less than 99.999% is obtained at the bottom of the tower. The low-temperature nitrogen evaporated in the second condenser-evaporator (34) and the third condenser-evaporator (27) is mixed with the room-temperature nitrogen and then fed into the fifth condenser-evaporator (29) to condense the high-purity xenon.

8. The krypton-xenon extraction method according to claim 7, characterized in that: Part of the low-temperature nitrogen evaporated in the first condenser evaporator (9) is mixed with the room-temperature nitrogen and then enters the second condenser evaporator (34) and the third condenser evaporator (27), while the other part is decompressed by a valve and discharged through the nitrogen discharge pipe (4).

9. The krypton-xenon extraction method according to claim 7, characterized in that: Part of the low-temperature nitrogen evaporated in the second condenser evaporator (34) and the third condenser evaporator (27) is mixed with the room-temperature nitrogen and then enters the fourth condenser evaporator (28) and the fifth condenser evaporator (29), while the other part is decompressed by a valve and discharged through the nitrogen discharge pipe (4).

10. The krypton-xenon extraction method according to claim 7, characterized in that: The low-temperature nitrogen gas evaporated in the fourth condenser evaporator (28) and the fifth condenser evaporator (29) is discharged through the nitrogen discharge pipe (4).

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