Gas phase processing system in a krypton-xenon refining system

Abstract

The utility model belongs to a kind of gas phase treatment system in krypton-xenon refining system;Including krypton-xenon refining system in the lean krypton-xenon raw material main pipeline, lean krypton-xenon raw material main pipeline is connected with the light removal rectifying column by the first passage of main condenser, and the top gas phase outlet of its light removal rectifying column is connected with column top condenser, and the gas phase outlet of column top condenser is connected with the concentration rectifying column of several krypton-xenon pre-concentration systems;The above structure can make the non-condensable gas in krypton-xenon refining system and krypton-xenon pre-concentration system and lean krypton-xenon filling system coupling, can effectively utilize the aforementioned non-condensable gas, avoid resource waste, oxygen in non-condensable gas can also be recycled simultaneously, improve concentration rectifying column and recovery rate, avoid the advantages that safety risk caused by methane aggregation in vaporizer in filling system.

Description

Technical Field

[0001] This utility model belongs to the field of gas phase reuse technology in krypton-xenon refining, specifically a gas phase processing system in a krypton-xenon refining system. Background Technology

[0002] Krypton and xenon are rare gases with important applications in many industrial and scientific research fields. Krypton-xenon extraction occurs in liquid oxygen, and as krypton and xenon are continuously concentrated, crude krypton-xenon liquid is eventually formed. The remaining oxygen in the krypton-xenon refining system can be liquefied by the top condenser and used as reflux liquid in the distillation column and / or returned to the liquid oxygen storage tank. However, some non-condensable gas (excess oxygen) is still emitted into the air, resulting in resource waste and increasing the production cost of krypton-xenon. Utility Model Content

[0003] To overcome the above deficiencies, this invention provides a gas phase processing system in a krypton-xenon refining system to solve the technical problems existing in the prior art.

[0004] The technical solution adopted by this utility model to solve its technical problem is:

[0005] A gas phase processing system in a krypton-xenon refining system includes a lean krypton-xenon feedstock main pipeline in the krypton-xenon refining system. The lean krypton-xenon feedstock main pipeline is connected to a light-light distillation column through a first channel of a main condenser. The top gas phase outlet of the light-light distillation column is connected to a top condenser. The gas phase outlet of the top condenser is connected to a concentration distillation column of several krypton-xenon pre-concentration systems.

[0006] The beneficial effects of this utility model are as follows: By coupling the krypton-xenon refining system with the krypton-xenon pre-concentration system, the non-condensable gas produced in the top condenser of the krypton-xenon refining system enters the concentrating distillation column of the krypton-xenon pre-concentration system, so that the non-condensable gas is re-liquefied and recovered. At the same time, the pressure in the concentrating distillation column can be increased, so as to facilitate the extraction of liquid oxygen in the concentrating distillation column.

[0007] Preferably, the gas phase outlet of the top condenser is connected to the first three-way valve, the second end of the first three-way valve is connected to the second three-way valve through the second channel of the main condenser, the third end of the first three-way valve is connected to the second end of the second three-way valve through the first control valve, and the third end of the second three-way valve is connected to the concentration distillation columns of several krypton-xenon pre-concentration systems.

[0008] Preferably, the concentrated distillation column is connected to a pipeline with a full-load valve via a second control valve and a third tee, and the third end of the third tee is connected to the third end of the second tee via a third control valve.

[0009] Preferably, a fourth three-way valve is provided between the third control valve and the second three-way valve, and the third end of the fourth three-way valve is connected to the vaporizer on the depleted krypton xenon filling tank through the fourth control valve.

[0010] Preferably, a fifth three-way valve is provided between the second and fourth three-way valves, and the third end of the fifth three-way valve is connected to the vent pipe through a fifth control valve.

[0011] Preferably, the gas phase outlet of the top condenser is connected to the concentration distillation columns of the two krypton-xenon pre-concentration systems.

[0012] A gas-phase processing system for a krypton-xenon refining system, fabricated according to the above scheme, allows the non-condensable gas produced in the overhead condenser of the krypton-xenon refining system to enter the concentrator of the krypton-xenon pre-concentration system. This allows the non-condensable gas to be re-liquefied and recovered within the concentrator, while simultaneously increasing the pressure within the concentrator to facilitate the extraction of liquid oxygen. Furthermore, this invention can send the non-condensable gas produced in the overhead condenser of the krypton-xenon refining system to the vaporizer of a lean krypton-xenon filling tanker, thus avoiding the risk of methane accumulation and explosion within the vaporizer. This invention couples the non-condensable gas in the krypton-xenon refining system with both the krypton-xenon pre-concentration system and the lean krypton-xenon filling system, enabling effective utilization of the non-condensable gas, avoiding resource waste, and recovering oxygen from the non-condensable gas. This also improves the efficiency of the concentrator and the extraction rate, and avoids the safety risks caused by methane accumulation in the vaporizer of the filling system. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the structure of this utility model.

[0015] In the diagram: 1. Main pipeline for lean krypton xenon feedstock; 2. Main condenser; 3. Light weight removal distillation column; 4. Top condenser; 5. Concentrated distillation column; 6. First tee; 7. Second tee; 8. First control valve; 9. Second control valve; 10. Third tee; 11. Fourth tee; 12. Fourth control valve; 13. Lean krypton xenon filling tank; 14. Vaporizer; 15. Fifth tee; 16. Fifth control valve; 17. Vent pipeline; 18. Third control valve; 19. Full valve. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0017] The following is in conjunction with the appendix Figure 1 This application provides a further detailed description of the present invention, which is a gas phase processing system in a krypton-xenon refining system. It includes a main pipeline 1 for lean krypton-xenon feedstock in the refining system. The main pipeline 1 is connected to a light-weight removal distillation column 3 via a first channel of a main condenser 2. The top gas phase outlet of the light-weight removal distillation column 3 is connected to a top condenser 4, and the gas phase outlet of the top condenser 4 is connected to a concentration distillation column 5 of several krypton-xenon pre-concentration systems. This invention primarily addresses the problem of resource waste caused by the venting of gas phase during the krypton-xenon refining process. Based on the properties of krypton-xenon gas extraction, the vented gas phase is mainly oxygen. Therefore, the present invention aims to solve the problem of how to recover and reuse the vented gas phase from the krypton-xenon refining system. Specifically, the vented gas phase is fed into the concentration distillation columns 5 of several krypton-xenon pre-concentration systems, allowing the non-condensable gases to be reliquefied and recovered within the concentration distillation columns. Simultaneously, the pressure within the concentration distillation columns is increased to facilitate the extraction of liquid oxygen.

[0018] Furthermore, the gas phase outlet of the top condenser 4 is connected to the first three-way valve 6. The second end of the first three-way valve 6 is connected to the second three-way valve 7 through the second channel of the main condenser 2. The third end of the first three-way valve 6 is connected to the second end of the second three-way valve 7 through the first control valve 8. The third end of the second three-way valve 7 is connected to the concentration distillation column 5 of several krypton-xenon pre-concentration systems. The above-mentioned arrangement of this utility model can adjust the temperature of the gas phase while recovering the cold energy from the gas phase of the top condenser 4. Specifically, the gas phase temperature passing through the main condenser 2 is relatively high (which enables the utilization of the cold energy from the gas phase of the top condenser 4), and the gas phase temperature not passing through the main condenser 2 is relatively low. By adjusting the gas volume, the temperature of the mixed gas phase can be controlled. The gas phase passing through the main condenser 2 can utilize its own cold energy. By adjusting the gas phase temperature, it can meet the inlet requirements of the concentration distillation column 5. At the same time, under the premise of meeting the inlet requirements, the gas phase temperature can be increased as much as possible to achieve the purpose of pressurizing the inside of the concentration distillation column 5.

[0019] Furthermore, the concentrated distillation column 5 is connected to a pipeline with a full-load valve 19 via a second control valve 9 and a third three-way valve 10. The third end of the third three-way valve 10 is connected to the third end of the second three-way valve 7 via a third control valve 18. The gas phase from the top condenser 4 described in this invention can enter through the existing full-load valve 19 in the concentrated distillation column 5. This configuration allows for pressurization and depressurization of the concentrated distillation column 5 without damaging its original structure, while also reducing equipment modification costs.

[0020] Furthermore, a fourth three-way valve 11 is provided between the third control valve 18 and the second three-way valve 7, and the third end of the fourth three-way valve 11 is connected to the vaporizer 14 on the depleted krypton xenon filling tank 13 through the fourth control valve 12. The gas phase from the top condenser 4 can not only re-enter the concentrating distillation column 5 for pressurization, but also enter the lean krypton xenon filling tank 13 through the vaporizer 14. The above process is mainly used when the lean krypton xenon filling tank 13 is self-pressurized during unloading, and methane may accumulate in the vaporizer 14, which is prone to explosion. This invention introduces the above gas to directly pressurize the lean krypton xenon filling tank 13, which not only avoids the risk of methane accumulation and explosion during self-pressurization of the vaporizer 14, but also avoids the energy consumption generated by starting the vaporizer 14. It should be noted that when the gas phase from the top condenser 4 enters the lean krypton xenon filling tank 13 through the vaporizer 14 for pressurization, the gas phase from the top condenser 4 can all pass through the main condenser 2, which not only achieves the characteristic of making full use of the cooling capacity, but also achieves the purpose of increasing the gas phase temperature to easily increase the internal pressure of the lean krypton xenon filling tank 13. Furthermore, the above-mentioned setup enables pressurization and reduces the risk of explosion without damaging the structure of the depleted krypton xenon filling tank 13, while also reducing the cost of equipment modification.

[0021] Furthermore, a fifth three-way valve 15 is provided between the second three-way valve 7 and the fourth three-way valve 11, and the third end of the fifth three-way valve 15 is connected to the vent pipe 17 through the fifth control valve 16. When the lean krypton xenon filling tank 13 and the concentrated distillation column 5 do not require pressurization, they can be vented through the vent pipe 17.

[0022] Furthermore, the gas phase outlet of the top condenser 4 is connected to the concentration distillation column 5 of the two krypton-xenon pre-concentration systems, respectively.

[0023] The working principle of this utility model is as follows: In the krypton-xenon refining system, the lean krypton-xenon raw material in the main pipeline 1 enters the light-light distillation column 3 through the first channel of the main condenser 2 for distillation. The liquid phase after distillation enters the subsequent process section, and the gas phase after distillation enters the top condenser 4 and exchanges heat with the cold source in the top condenser 4 for condensation. The non-condensable gas after heat exchange and condensation can enter the concentrated distillation column 5 for pressurization, and / or enter the lean krypton-xenon filling tank 13 for pressurization. When it is not necessary to enter the above equipment for pressurization, it can be vented through the venting pipeline 17. When it is necessary to enter the concentrated distillation column 5 for pressurization, the temperature of the gas phase entering the concentrated distillation column 5 can be adjusted according to the actual working conditions. The purpose of this adjustment is to make the gas phase temperature meet the requirements for entering the concentrated distillation column 5, and, under the premise of meeting the above requirements, make the gas phase temperature as high as possible to achieve the characteristic of pressurizing the concentrated distillation column 5. The specific process is: the flow of the gas phase that has not passed through the main condenser 2 is controlled by the first control valve 8. One stream of gas (with a relatively low gas phase temperature) passes through the main condenser 2 for heat exchange (the cooling capacity of this stream of gas is utilized, hence its relatively high temperature). The two streams merge and enter through the original full-load valve 19 of the concentrator 5. Entering the concentrator 5 allows for the re-liquefaction and recovery of the gas phase, and also increases the pressure within the concentrator 5, facilitating the extraction of liquid oxygen. When pressurization is required in the lean krypton xenon filling tank 13, the gas phase can be entirely cooled by passing through the main condenser 2. The cooled gas phase then enters the lean krypton xenon filling tank 13 via the vaporizer 14 for pressurization. This not only avoids the risk of methane accumulation and explosion during self-pressurization of the vaporizer 14, but also avoids the energy consumption associated with starting the vaporizer 14. This system features increased liquid oxygen recovery, reduced risk of methane accumulation and explosion within the vaporizer, and lower modification costs while ensuring stable equipment operation.

[0024] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A gas-phase processing system in a krypton-xenon refining system, comprising a lean krypton-xenon feedstock main pipeline (1) in the krypton-xenon refining system, the lean krypton-xenon feedstock main pipeline (1) being connected to a light-light distillation column (3) via a first channel of a main condenser (2), characterized in that: The top gas phase outlet of the light-removing distillation column (3) is connected to the top condenser (4), and the gas phase outlet of the top condenser (4) is connected to the concentration distillation column (5) of several krypton-xenon pre-concentration systems.

2. The gas phase processing system in a krypton-xenon refining system according to claim 1, characterized in that: The gas phase outlet of the top condenser (4) is connected to the first three-way valve (6). The second end of the first three-way valve (6) is connected to the second three-way valve (7) through the second channel of the main condenser (2). The third end of the first three-way valve (6) is connected to the second end of the second three-way valve (7) through the first control valve (8). The third end of the second three-way valve (7) is connected to the concentration distillation column (5) of several krypton-xenon pre-concentration systems.

3. The gas phase processing system in a krypton-xenon refining system according to claim 2, characterized in that: The concentrated distillation column (5) is connected to a pipeline with a full-load valve (19) via a second control valve (9) and a third tee (10). The third end of the third tee (10) is connected to the third end of the second tee (7) via a third control valve (18).

4. The gas phase processing system in a krypton-xenon refining system according to claim 3, characterized in that: A fourth three-way valve (11) is provided between the third control valve (18) and the second three-way valve (7). The third end of the fourth three-way valve (11) is connected to the vaporizer (14) on the depleted krypton xenon filling tank (13) through the fourth control valve (12).

5. The gas phase processing system in a krypton-xenon refining system according to claim 4, characterized in that: A fifth tee (15) is provided between the second tee (7) and the fourth tee (11). The third end of the fifth tee (15) is connected to the vent pipe (17) through the fifth control valve (16).

6. The gas phase processing system in a krypton-xenon refining system according to any one of claims 1-3, characterized in that: The gas phase outlet of the top condenser (4) is connected to the concentration distillation column (5) of the two krypton-xenon pre-concentration systems.

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