A device for purifying a crude krypton-xenon gas
By installing a three-way valve and an adsorber in the existing crude krypton-xenon purification system, the problem of purifying purchased crude krypton-xenon gas is solved, the electric heating load and cooling consumption are reduced, and the system achieves stable operation and improved energy efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HENAN XINLIANXIN SHENLENG ENERGY
- Filing Date
- 2025-08-05
- Publication Date
- 2026-07-24
AI Technical Summary
Existing cryogenic distillation equipment has high investment costs and limited processing capacity. Purchasing crude krypton xenon gas for purification is costly and may cause pipeline blockage. Furthermore, existing equipment cannot effectively process crude krypton xenon gas from external cylinders.
The existing crude krypton xenon purification system is equipped with a first three-way valve, an adsorber, and a multi-stage heat exchanger. By mixing the crude krypton xenon produced in the pre-process section with the purchased crude krypton xenon gas, the adsorber removes moisture, lowers the temperature, and increases the temperature of the material entering the distillation column, thereby reducing the electric heating load.
This method achieves effective purification of purchased crude krypton xenon gas, reduces the load on the electrically heated reboiler, avoids pipe blockage, saves cooling energy consumption, and improves system stability and energy efficiency.
Smart Images
Figure CN224540997U_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of krypton-xenon gas preparation and concentration technology, specifically a purification device for crude krypton-xenon gas. Background Technology
[0002] Krypton and xenon are rare gases with important applications in many industrial and scientific fields, such as semiconductor manufacturing, lighting, and low-temperature superconductivity research in the electronics industry. With the rapid development of the electronics industry and fierce competition, product unit cost has become a key competitive advantage for companies.
[0003] Crude krypton-xenon gas extraction occurs in liquid oxygen. With the continuous concentration of krypton and xenon, crude krypton-xenon liquid is eventually formed. Current crude krypton-xenon purification is achieved through cryogenic distillation, where the crude krypton-xenon gas is fed into a subsequent distillation column via a main feed gas pipeline for cryogenic distillation. As is well known, cryogenic distillation equipment has high investment costs, and some small and medium-sized enterprises cannot perform subsequent concentration and purification. They can only vaporize the crude krypton-xenon liquid in a vaporizer and store it in steel cylinders for external sale as raw material. However, most companies with cryogenic distillation equipment normally do not choose externally sourced crude krypton-xenon from steel cylinders for distillation, because... The reasons are as follows: 1. During the distillation process, the electric heater in existing distillation equipment is generally operating at full load, meaning that the processing capacity of existing distillation equipment is limited and cannot purify crude krypton xenon from external sources; 2. Low-temperature distillation equipment requires a low temperature for the raw material, and a large amount of cooling energy is required before purchasing crude krypton xenon from cylinders for low-temperature distillation, resulting in high purification costs for purchased crude krypton xenon; 3. Due to inconsistent cylinder standards and processing standards, the crude krypton xenon from external sources has unstable impurity components in the cylinders, which may cause blockages in the system pipelines after the gas enters the system. Utility Model Content
[0004] To overcome the above deficiencies, this invention provides a purification device for crude krypton xenon gas, thereby solving the technical problems existing in the prior art.
[0005] The technical solution adopted by this utility model to solve its technical problem is:
[0006] A purification device for crude krypton-xenon gas includes a crude krypton-xenon distillation column. The crude krypton-xenon distillation column is equipped with an electrically heated reboiler inside. The inlet of the crude krypton-xenon distillation column is equipped with a main feed gas pipeline. The main feed gas pipeline is equipped with a first tee. The third end of the first tee is connected to a crude krypton-xenon recovery section. The crude krypton-xenon recovery section includes a crude krypton-xenon recovery pipeline, which is connected to the third end of the first tee through an adsorber.
[0007] The beneficial effects of this utility model are as follows: The essence of this utility model is the modification of the existing crude krypton xenon purification system, enabling it to purify both the crude krypton xenon produced in the upstream section and the purchased crude krypton xenon gas. Specifically, by setting a first three-way valve in the existing crude krypton xenon gas purification system, the crude krypton xenon gas from the outside is purified. This process allows the crude krypton xenon gas produced in the upstream section to be mixed with the purchased crude krypton xenon gas, thereby lowering the temperature of the crude krypton xenon gas to meet the requirements of low-temperature distillation. At the same time, the temperature of the crude krypton xenon gas produced in the upstream section is raised to increase the temperature at which it enters the crude krypton xenon distillation column, thereby reducing the heating load of the electrically heated reboiler. Furthermore, by setting an adsorber, moisture in the purchased crude krypton xenon gas can be removed to avoid the defect of pipeline blockage caused by icing after the crude krypton xenon gas is cooled.
[0008] Preferably, the main feed gas pipeline is connected to the inlet of the crude krypton-xenon distillation column via the first channel of the preheat exchanger and the first channel of the main heat exchanger; a second tee and a third tee are respectively provided on both sides of the first channel of the main heat exchanger, and a first tee is provided between the third end of the second tee and the third end of the third tee; a first flow meter and a first control valve are provided between the second tee and the first channel of the main heat exchanger; a second flow meter and a second control valve are provided between the second tee and the first tee.
[0009] Preferably, the gas phase outlet at the top of the crude krypton-xenon distillation column is connected to the first channel of the condenser, the gas phase outlet of the first channel of the condenser is connected to the first tail gas venting pipe through the first venting valve, and the liquid phase outlet of the first channel of the condenser is connected to the reflux port at the top of the crude krypton-xenon distillation column; the liquid nitrogen pipeline is connected to the nitrogen heater through the second channel of the condenser, the second channel of the main heat exchanger and the second channel of the preheat exchanger, and the nitrogen heater is connected to the regeneration gas inlet of the adsorber.
[0010] Preferably, a fourth three-way valve and a fourth control valve are provided between the second channel of the preheater and the nitrogen heater, and the third end of the fourth three-way valve is connected to a second vent pipe with a second vent valve.
[0011] Preferably, the front part of the adsorber is provided with a third control valve, a third flow meter and a pressure reducing valve in sequence.
[0012] Preferably, a fifth three-way valve and a filter are sequentially provided between the adsorber and the first three-way valve, and the third end of the fifth three-way valve is connected to the gas analysis chamber through a fifth control valve.
[0013] A purification device for crude krypton xenon gas was fabricated according to the above scheme. This purification device can purify both the crude krypton xenon produced in the previous stage and purchased crude krypton xenon gas, thus achieving the characteristic of purifying purchased crude krypton xenon gas while reducing modification costs. Specifically, this invention utilizes an adsorber to remove moisture from the purchased crude krypton xenon gas, preventing the crude krypton xenon gas from freezing and causing pipeline blockage after cooling. Simultaneously, it mixes the crude krypton xenon gas produced in the previous stage with the purchased crude krypton xenon gas, thereby lowering the temperature of the crude krypton xenon gas. In order to meet the requirements of low-temperature distillation, this invention can also raise the temperature of the crude krypton xenon produced in the upstream section to increase the temperature of its entry into the crude krypton xenon distillation column, thereby reducing the heating load of the electric reboiler. Furthermore, this invention, through a two-stage material mixing method, not only ensures the stability of the inlet material temperature of the crude krypton xenon distillation column to achieve stable distillation, but also allows a portion of the crude krypton xenon produced in the upstream section to bypass the main heat exchanger for cooling, thereby further raising the temperature of the material entering the crude krypton xenon distillation column and reducing the heating load of the electric reboiler. This invention uses liquid nitrogen to provide cooling for the condenser, and the nitrogen gas after providing cooling provides cooling for the main heat exchanger and preheater to cool the crude krypton-xenon liquid and meet the distillation requirements of the crude krypton-xenon distillation column. At the same time, this invention utilizes the nitrogen gas after providing cooling as the regeneration gas for the adsorber to achieve energy saving, consumption reduction and cost saving. It has the advantages of modifying the existing crude krypton-xenon purification system to meet the purification of crude krypton-xenon produced in the previous stage and purchased crude krypton-xenon gas, with reasonable process design, low energy consumption and the ability to achieve long-term stable operation. Attached Figure Description
[0014] 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.
[0015] Figure 1 This is a schematic diagram of the structure of this utility model.
[0016] In the diagram: 1. Crude krypton-xenon distillation column; 2. Electrically heated reboiler; 3. Main feed gas pipeline; 4. First tee; 5. Crude krypton-xenon recovery pipeline; 6. Adsorber; 7. Main heat exchanger; 8. Second tee; 9. Third tee; 10. First flow meter; 11. First control valve; 12. Second flow meter; 13. Second control valve; 14. Condenser; 15. First vent valve; 16. Liquid nitrogen pipeline; 17. Nitrogen heater; 18. Fourth tee; 19. Fifth control valve; 20. Second vent valve; 21. Third control valve; 22. Third flow meter; 23. Pressure reducing valve; 24. Fifth tee; 25. Filter; 26. Gas analysis chamber; 27. Fifth control valve; 28. Preheat exchanger. Detailed Implementation
[0017] 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.
[0018] The following is in conjunction with the appendix Figure 1This application provides a further detailed description of a purification device for crude krypton-xenon gas, comprising a crude krypton-xenon distillation column 1, an electrically heated reboiler 2 inside the crude krypton-xenon distillation column 1, a main feed gas pipeline 3 at the inlet of the crude krypton-xenon distillation column 1, a first tee 4 on the main feed gas pipeline 3, the third end of the first tee 4 being connected to a crude krypton-xenon recovery section, the crude krypton-xenon recovery section including a crude krypton-xenon recovery pipeline 5, the crude krypton-xenon recovery pipeline 5 being connected to the third end of the first tee 4 via an adsorber 6. The essence of this invention lies in the modification of the existing crude krypton-xenon purification system. This system enables the purification of both the crude krypton-xenon produced in the upstream process and the purchased crude krypton-xenon gas, thereby improving the purification efficiency while meeting the heating load requirements of the electrically heated reboiler 2. Using this invention, the crude krypton-xenon produced in the upstream process can be processed separately, or both can be processed simultaneously. Specifically, the purchased crude krypton-xenon gas is dehydrated by the adsorber 6, thus preventing freezing and pipe blockage at low temperatures. Furthermore… This invention utilizes the heat from purchased crude krypton-xenon gas to mix with the crude krypton-xenon gas produced in the previous stage, thereby increasing the temperature of the material entering the crude krypton-xenon distillation column 1. This reduces the heating load on the electrically heated reboiler 2 and avoids the loss of cooling energy caused by the need to cool the purchased crude krypton-xenon gas. The above configuration avoids the problems of pipe blockage and high energy consumption caused by the purchased krypton-xenon gas (including the high heat load caused by the increased amount of material entering the crude krypton-xenon distillation column 1 and the high cooling energy consumption caused by cooling the purchased crude krypton-xenon gas), and enables the purification of the purchased crude krypton-xenon gas.
[0019] Furthermore, the main raw gas pipeline 3 is connected to the inlet of the crude krypton-xenon distillation column 1 via the first channel of the preheat exchanger 28 and the first channel of the main heat exchanger 7; a second tee 8 and a third tee 9 are respectively provided on both sides of the first channel of the main heat exchanger 7, and a first tee 4 is provided between the third end of the second tee 8 and the third end of the third tee 9; a first flow meter 10 and a first control valve 11 are provided between the second tee 8 and the first channel of the main heat exchanger 7; a second flow meter 12 and a second control valve 13 are provided between the second tee 8 and the first tee 4. The above-mentioned configuration of this utility model enables the two-stage mixing of purchased crude krypton xenon gas with the crude krypton xenon gas produced in the previous stage. The two-stage mixing enables the crude krypton xenon gas to be cooled down step by step with uniform and stable temperature, laying the foundation for the long-term stable operation of the crude krypton xenon distillation column 1. Furthermore, since some of the crude krypton xenon gas produced in the previous stage does not pass through the main heat exchanger 7, and the temperature of the material entering the crude krypton xenon distillation column 1 can be raised as a whole by introducing purchased crude krypton xenon gas, the energy consumption of the electric heating reboiler 2 is saved.
[0020] Furthermore, the gas phase outlet at the top of the crude krypton-xenon distillation column 1 is connected to the first channel of the condenser 14. The gas phase outlet of the first channel of the condenser 14 is connected to the first tail gas venting pipe through the first venting valve 15. The liquid phase outlet of the first channel of the condenser 14 is connected to the reflux port at the top of the crude krypton-xenon distillation column 1. The liquid nitrogen pipe 16 is connected to the nitrogen heater 17 through the second channel of the condenser 14, the second channel of the main heat exchanger 7, and the second channel of the preheater 28. The nitrogen heater 17 is connected to the regeneration gas inlet of the adsorber 6. This invention uses liquid nitrogen in liquid nitrogen pipeline 16 as a cold source to condense the gas phase in condenser 14. The liquid phase after condensation is returned to the crude krypton-xenon distillation column 1 as reflux liquid. Non-condensable gases are discharged through the first tail gas venting pipeline equipped with the first venting valve 15. Furthermore, the nitrogen gas after heat exchange is used as a cold source to achieve heat exchange in the main heat exchanger 7 and the preheating heat exchanger 28. The above heat exchange process can realize the stepwise utilization of nitrogen cooling capacity, while raising the temperature of nitrogen gas. After being heated by nitrogen heater 17, it can be used as regeneration gas for adsorber 6 to achieve full utilization of nitrogen gas.
[0021] Furthermore, a fourth three-way valve 18 and a fourth control valve 19 are provided between the second channel of the preheater 28 and the nitrogen heater 17. The third end of the fourth three-way valve 18 is connected to a second vent pipe equipped with a second vent valve 20. The nitrogen can choose its path according to the actual situation. When it needs to be used as regeneration gas, it can enter the nitrogen heater 17 for heating and then be sent to the adsorber 6. When the adsorber 6 is operating normally, the nitrogen can be vented through the second vent pipe equipped with the second vent valve 20.
[0022] Furthermore, the front of the adsorber 6 is sequentially equipped with a third control valve 21, a third flow meter 22, and a pressure reducing valve 23. This invention uses a first flow meter 10, a second flow meter 12, and a third flow meter 22 to detect the flow rate of the material entering the crude krypton-xenon distillation column 1, and controls the proportions of the various materials through corresponding control valves. This control also indirectly regulates the temperature of the material entering the crude krypton-xenon distillation column 1, thereby ensuring the long-term stable operation of the crude krypton-xenon distillation column 1.
[0023] Furthermore, a fifth three-way valve 24 and a filter 25 are sequentially provided between the adsorber 6 and the first three-way valve 4. The third end of the fifth three-way valve 24 is connected to the gas analysis chamber 26 through a fifth control valve 19. This invention can analyze the impurity components of crude krypton xenon gas through the gas analysis chamber 26. In the actual distillation process, the distillation parameters can be adjusted according to the impurity components of the crude krypton xenon gas. Furthermore, the crude krypton xenon gas can be purified by setting the filter 25.
[0024] The working principle of this utility model is as follows: the raw gas in the main raw gas pipeline 3 undergoes heat exchange through the preheat exchanger 28, and after heat exchange, a portion of the raw gas enters the main heat exchanger 7 through the second three-way valve 8 for further heat exchange (maximum gas flow rate is 600 NM). 3 / h), the other part enters the bypass pipeline (the maximum gas flow rate in the bypass pipeline is 15NM). 3 The crude krypton xenon gas is then combined with purified purchased crude krypton xenon gas. The purchased crude krypton xenon gas cylinder is connected to the crude krypton xenon gas recycling pipeline 5. The pressure of the crude krypton xenon gas is reduced to 0.5 MPa through the pressure reducing valve 23, and then it enters the adsorber 6 through the third flow meter 22 and the third control valve 21 to remove moisture from the crude krypton xenon gas. The adsorber 6 can be set up in parallel with two sets, operating in a mode where one adsorbs and the other regenerates. The third flow meter 22 monitors the flow rate, and the third control valve 21 controls the maximum flow rate of the purchased crude krypton xenon gas to not exceed 5 NM. 3 / h; Most of the crude krypton xenon gas passing through the adsorber 6 is filtered through the filter 25 and then enters the first three-way valve 4, where it mixes with the crude krypton xenon gas in the bypass pipe; a small portion of the crude krypton xenon gas passing through the adsorber 6 enters the gas analysis chamber 26 for analysis of impurity components in the purchased crude krypton xenon gas; the crude krypton xenon gas passing through the adsorber 6 and filter 25 can avoid the possibility of pipe blockage; the gas mixed through the first three-way valve 4 enters the third three-way valve 9, mixes with the crude krypton xenon gas from the main heat exchanger 7, and then enters the crude krypton xenon tower rectification column 1 for rectification. The liquid phase after rectification enters the subsequent process, and the gas phase after rectification enters the condenser 14, where it exchanges heat with liquid nitrogen from the liquid nitrogen pipe 16. The liquid phase after the gas phase condenses is returned to the crude krypton xenon tower rectification column 1 as reflux liquid. Non-condensable gases pass through the first three-way valve 25. The first exhaust gas vent pipe of the vent valve 15 is used for external discharge; the nitrogen gas temperature after the above heat exchange is about -130℃, the nitrogen gas temperature of -1℃ is about 30℃, the nitrogen gas temperature after heat exchange through the main heat exchanger 7 is about -40℃, the nitrogen gas temperature of -40℃ is about 15℃ after heat exchange through the pre-heat exchanger 28. When the adsorber 6 does not need to be regenerated, the nitrogen gas temperature of about 15℃ is vented through the second vent pipe with the second vent valve 20. When the adsorber 6 needs to be regenerated, the nitrogen gas temperature of about 15℃ enters the nitrogen heater 17 to raise the temperature to 200℃, and then sends it into the adsorber 6 that needs to be regenerated for regeneration and activation. This not only increases the service life of the adsorber, but also ensures that the molecular sieve in the adsorber can effectively adsorb the impurity components in the crude krypton xenon cylinder. The above method can not only modify the existing crude krypton xenon purification system to meet the needs of purifying crude krypton xenon produced in the previous stage and purchased crude krypton xenon, but also has the characteristics of reasonable process design, low energy consumption and long-term stable operation.
[0025] 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 purification apparatus for crude krypton-xenon gas, comprising a crude krypton-xenon distillation column (1), wherein the crude krypton-xenon distillation column (1) is provided with an electrically heated reboiler (2), characterized in that: The crude krypton-xenon distillation column (1) is equipped with a main feed gas pipeline (3) at its inlet. A first tee (4) is provided on the main feed gas pipeline (3), and the third end of the first tee (4) is connected to the crude krypton-xenon recovery section. The crude krypton xenon recovery section includes a crude krypton xenon recovery pipe (5), which is connected to the third end of the first tee (4) via an adsorber (6).
2. The purification device for crude krypton-xenon gas according to claim 1, characterized in that: The main raw gas pipeline (3) is connected to the inlet of the crude krypton-xenon distillation column (1) through the first channel of the preheat exchanger (28) and the first channel of the main heat exchanger (7); The first channel of the main heat exchanger (7) is provided with a second tee (8) and a third tee (9) on both sides respectively, and a first tee (4) is provided between the third end of the second tee (8) and the third end of the third tee (9); A first flow meter (10) and a first control valve (11) are provided between the second three-way valve (8) and the first channel of the main heat exchanger (7); A second flow meter (12) and a second control valve (13) are provided between the second tee (8) and the first tee (4).
3. The purification device for crude krypton-xenon gas according to claim 2, characterized in that: The gas phase outlet at the top of the crude krypton xenon distillation column (1) is connected to the first channel of the condenser (14). The gas phase outlet of the first channel of the condenser (14) is connected to the first tail gas venting pipe through the first venting valve (15). The liquid phase outlet of the first channel of the condenser (14) is connected to the reflux port at the top of the crude krypton xenon distillation column (1). The liquid nitrogen pipeline (16) is connected to the nitrogen heater (17) through the second channel of the condenser (14), the second channel of the main heat exchanger (7) and the second channel of the preheater (28). The nitrogen heater (17) is connected to the regeneration gas inlet of the adsorber (6).
4. The purification apparatus for crude krypton-xenon gas according to claim 3, characterized in that: The second channel of the preheater (28) is provided with a fourth three-way valve (18) and a fourth control valve (19) between it and the nitrogen heater (17). The third end of the fourth three-way valve (18) is connected to the second vent pipe with a second vent valve (20).
5. The purification apparatus for crude krypton-xenon gas according to claim 1, characterized in that: The front part of the adsorber (6) is provided with a third control valve (21), a third flow meter (22) and a pressure reducing valve (23).
6. A purification apparatus for crude krypton-xenon gas according to claim 1, 2, or 5, characterized in that: A fifth three-way valve (24) and a filter (25) are sequentially provided between the adsorber (6) and the first three-way valve (4). The third end of the fifth three-way valve (24) is connected to the gas analysis chamber (26) through the fifth control valve (27).