Device for purifying helium through oxidative dehydrogenation
Through the design of the helium oxidation and dehydrogenation purification device, catalytic oxidation reaction and deoxygenation reaction are combined with heat exchanger to absorb heat, solving the risk of catalyst deactivation or explosion, achieving safe and efficient helium purification, ensuring the acquisition of high-purity helium.
Patent Information
- Application Number
- CN202422478082.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-14
- Publication Date
- 2025-09-05
- Estimated Expiration
- 2034-10-14
AI Technical Summary
When excessive oxygen is added to the prior art, the helium oxidation and dehydrogenation process poses a risk of catalyst deactivation or explosion. How to safely and effectively remove hydrogen from hydrogen-rich helium exhaust gas and purify high-purity helium.
Helium oxidation and dehydrogenation purification device is adopted, including gas storage tanks, pipelines, oxidation and dehydrogenation purification units and heat exchangers. The heat is absorbed through catalytic oxidation reaction and deoxygenation reaction combined with the heat exchanger to avoid excessive temperature. The device includes multiple catalytic oxidation reactors, deoxygenation reactors and oxygen supply components. Using precious metals or transition metal oxide catalysts, two groups of reactors operate alternately to maintain catalyst activity.
Effectively absorb heat from catalytic oxidation reaction, avoid catalyst deactivation or explosion, ensure the safety and high purity of the helium purification process, maintain the catalyst activity through alternate operation of the two groups of reactors, and reduce the risk of catalyst deactivation or agglomeration at high temperatures.
Smart Images
Figure CN223299810U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of gas purification, in particular to a device for purifying helium by oxidative dehydrogenation. Background Art
[0002] Helium (He) is a rare, monatomic, inert gas widely used in aerospace, medical, refrigeration, welding, and other fields. However, its natural abundance is extremely low, accounting for only 0.0005% of the total atmospheric volume. Helium primarily exists as a dissolved form in natural gas, typically at levels below 0.05% (v / v). Therefore, extracting helium from natural gas requires complex processes and high investment costs.
[0003] With the rapid development of the liquefied natural gas (LNG) industry, LNG has become an important source of helium. During storage and transportation, LNG produces cryogenic flash steam, a component of LNG that is difficult to liquefy and gradually accumulates in the LNG.
[0004] The main components of low-temperature flash steam are methane (CH4), nitrogen (N2), helium (He), and hydrogen (H2). To separate and extract He from low-temperature flash steam, cryogenic distillation or membrane separation can be used to remove CH4 and N2 from the low-temperature flash steam. Hen can then be separated and purified from the remaining He- and H2-rich tail gas. Because the CH4 and some H2 in the low-temperature flash steam completely combust with the O2 in the pure air produced by air separation, producing water (H2O) and carbon dioxide (CO2), the H2 content in the low-temperature flash steam is relatively high, typically exceeding 4%.
[0005] To separate and extract high-purity He from low-temperature flash steam, H2 must first be removed from the H2-rich He tail gas. A common method is to add excess O2 to catalytically convert H2 into H2O. However, this method carries certain safety risks, as the reaction between H2 and O2 is exothermic. When the H2 content is high, the reaction temperature rises, potentially leading to catalyst deactivation or explosion. Therefore, how to safely and effectively remove H2 from H2-rich He tail gas and purify high-purity He is a technical challenge. Utility Model Content
[0006] The utility model provides a helium oxidative dehydrogenation purification device, which is used to solve the defect in the prior art that adding excessive oxygen may cause catalyst deactivation or explosion.
[0007] The utility model provides a device for oxidative dehydrogenation and purification of helium, comprising: a first gas storage tank, a first pipeline, an oxidative dehydrogenation purification unit and a heat exchanger; the first gas storage tank is used to store helium, and the first gas storage tank is connected to the oxidative dehydrogenation purification unit through the first pipeline; the oxidative dehydrogenation purification unit is used to react with hydrogen in the helium to purify the helium; the heat exchanger is arranged in the oxidative dehydrogenation purification unit, and the heat exchanger is used to absorb heat generated during the oxidation reaction.
[0008] According to the utility model, a device for oxidative dehydrogenation and purification of helium is provided, which also includes a pipeline assembly. The oxidative dehydrogenation purification unit includes: a first oxidative dehydrogenation purification assembly and a second oxidative dehydrogenation purification assembly; the first oxidative dehydrogenation purification assembly is connected to the first pipeline, and the second oxidative dehydrogenation purification assembly is connected to the first oxidative dehydrogenation purification assembly, and the two ends of the pipeline assembly are respectively connected to the second oxidative dehydrogenation purification assembly and the first pipeline.
[0009] According to a device for helium oxidation, dehydrogenation and purification provided by the utility model, the first oxidation, dehydrogenation and purification component includes: a first catalytic oxidation reactor, a first deoxygenation reactor and a first oxygen supply component; the first catalytic oxidation reactor is connected to the first pipeline, the first deoxygenation reactor is connected to the first catalytic oxidation reactor and the second oxidation, dehydrogenation and purification component, and the first oxygen supply component is connected to the first catalytic oxidation reactor; the first oxygen supply component is used to provide oxygen to the first catalytic oxidation reactor, and the heat exchanger is provided in the first catalytic oxidation reactor.
[0010] According to a helium oxidation, dehydrogenation and purification device provided by the utility model, the second oxidation, dehydrogenation and purification component includes: a second catalytic oxidation reactor, a second deoxygenation reactor and a second oxygen supply component; the second catalytic oxidation reactor is connected to the first deoxygenation reactor, the second deoxygenation reactor is connected to the second catalytic oxidation reactor, the second oxygen supply component is connected to the second catalytic oxidation reactor, and the second catalytic oxidation reactor and the second deoxygenation reactor are connected to the first pipeline through the pipeline component; the second oxygen supply component is used to provide oxygen to the second catalytic oxidation reactor, and the heat exchanger is provided in the second catalytic oxidation reactor.
[0011] According to a helium oxidation dehydrogenation purification device provided by the present invention, the pipeline assembly includes: a second pipeline and a third pipeline; the two ends of the second pipeline are respectively connected to the first pipeline and the second catalytic oxidation reactor; the two ends of the third pipeline are respectively connected to the first pipeline and the second deoxygenation reactor.
[0012] According to the utility model, a device for oxidative dehydrogenation and purification of helium further includes a preheater, which is arranged in the first pipeline and is used to preheat the helium.
[0013] According to a helium oxidation dehydrogenation purification device provided by the present invention, the first oxygen supply component includes: a second gas storage tank, a fourth pipeline and a first disperser; the second gas storage tank is connected to the first catalytic oxidation reactor through the fourth pipeline, and the first disperser is arranged in the fourth pipeline.
[0014] According to a helium oxidation dehydrogenation purification device provided by the present invention, the second oxygen supply component includes: a third gas storage tank, a fifth pipeline and a second disperser; the third gas storage tank is connected to the second catalytic oxidation reactor through the fifth pipeline, and the second disperser is arranged on the fifth pipeline.
[0015] According to the utility model, a helium oxidation dehydrogenation purification device further includes a plurality of collectors, and the plurality of collectors are respectively connected to the first deoxygenation reactor and the second deoxygenation reactor.
[0016] According to the utility model, a helium oxidation dehydrogenation purification device further includes a plurality of valves, and the plurality of valves are respectively arranged on the first pipeline and the pipeline assembly.
[0017] The helium oxidative dehydrogenation purification device provided by the utility model can absorb heat in the catalytic oxidation reaction process by arranging an oxidative dehydrogenation purification unit and a heat exchanger, thereby avoiding catalyst deactivation or explosion caused by excessive temperature of the oxidative dehydrogenation purification unit. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0019] Figure 1 It is a structural schematic diagram of a device for oxidative dehydrogenation and purification of helium provided by the utility model.
[0020] Reference numerals:
[0021] 11. First gas storage tank; 12. Second gas storage tank; 13. Third gas storage tank; 21. First catalytic oxidation reactor; 22. First deoxygenation reactor; 23. Second catalytic oxidation reactor; 24. Second deoxygenation reactor; 31. First collector; 32. Second collector; 40. Preheater; 51. First disperser; 52. Second disperser; 61. First pipeline; 62. Second pipeline; 63. Third pipeline; 64. Fourth pipeline; 65. Fifth pipeline; 66. Sixth pipeline; 67. Seventh pipeline; 68. Eighth pipeline; 71. First valve; 72. Second valve; 73. Third valve; 74. Fourth valve; 75. Fifth valve; 76. Sixth valve; 77. Seventh valve; 78. Eighth valve. DETAILED DESCRIPTION
[0022] To make the purpose, technical solutions, and advantages of the present invention more clear, the following will be combined with the accompanying drawings to clearly and completely describe the technical solutions of the present invention. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0023] The following combination Figure 1 The utility model describes the device for purifying helium by oxidative dehydrogenation.
[0024] like Figure 1 As shown, in an embodiment of the present invention, an apparatus for oxidative dehydrogenation and purification of helium includes: a first gas tank 11, a first pipeline 61, an oxidative dehydrogenation purification unit, and a heat exchanger. The first gas tank 11 is used to store helium and is connected to the oxidative dehydrogenation purification unit via the first pipeline 61. The oxidative dehydrogenation purification unit is used to oxidatively dehydrogenate and purify the helium. The oxidative dehydrogenation purification unit is equipped with a heat exchanger to absorb heat generated during the oxidation reaction.
[0025] Specifically, the helium in the first gas tank 11 enters the oxidative dehydrogenation purification unit through the first pipeline 61 for a catalytic oxidation reaction. In this embodiment, the helium in the first gas tank 11 is rich in hydrogen. The hydrogen-rich helium undergoes a catalytic oxidation reaction with oxygen in the oxidative dehydrogenation purification unit. The heat generated by the catalytic oxidation reaction is absorbed by the heat exchanger, thereby ensuring that the temperature in the oxidative dehydrogenation purification unit does not become excessively high, which could lead to catalyst deactivation or explosion of the oxidative dehydrogenation purification unit.
[0026] The helium oxidative dehydrogenation purification device provided in the embodiment of the present invention can absorb heat during the catalytic oxidation reaction by providing an oxidative dehydrogenation purification unit and a heat exchanger, thereby avoiding catalyst deactivation or explosion caused by excessive temperature of the oxidative dehydrogenation purification unit.
[0027] In an embodiment of the present invention, the apparatus for oxidative dehydrogenation and purification of helium further includes a pipeline assembly. The oxidative dehydrogenation purification unit includes: a first oxidative dehydrogenation purification assembly and a second oxidative dehydrogenation purification assembly, wherein the first oxidative dehydrogenation purification assembly is connected to a first pipeline 61, and the second oxidative dehydrogenation purification assembly is connected to the first oxidative dehydrogenation purification assembly, and the two ends of the pipeline assembly are respectively connected to the second oxidative dehydrogenation purification assembly and the first pipeline 61.
[0028] Specifically, the helium in the first gas storage tank 11 enters the first oxidative dehydrogenation purification assembly through the first pipeline 61 for a catalytic oxidation reaction. The exhaust gas after catalytic oxidation still contains hydrogen, which undergoes a primary deoxidation reaction with the deoxidizer in the first oxidative dehydrogenation purification assembly. Some of the hydrogen reacts with the oxidized portion of the deoxidizer and is consumed. The exhaust gas then undergoes a secondary catalytic oxidation reaction and a secondary deoxidation reaction in the second oxidative dehydrogenation purification assembly to produce high-purity helium.
[0029] During the secondary deoxygenation reaction, the deoxidizer in the second oxidative dehydrogenation purification assembly is partially oxidized. Helium undergoes catalytic oxidation and deoxygenation reactions in the second oxidative dehydrogenation purification assembly through the pipeline assembly. The resulting tail gas then flows through the pipeline assembly, through the first pipeline 61, and into the first oxidative dehydrogenation purification assembly, where it undergoes catalytic oxidation and deoxygenation reactions again, yielding high-purity helium.
[0030] like Figure 1 As shown, in an embodiment of the present invention, the first oxidative dehydrogenation purification assembly includes: a first catalytic oxidation reactor 21, a first deoxygenation reactor 22, and a first oxygen supply assembly. The first catalytic oxidation reactor 21 is connected to the first pipeline 61, the first deoxygenation reactor 22 is connected to the first catalytic oxidation reactor 21, and the first oxygen supply assembly is connected to the first catalytic oxidation reactor 21. The first oxygen supply assembly is used to provide oxygen to the first catalytic oxidation reactor 21.
[0031] Specifically, the helium in the first gas tank 11 enters the first catalytic oxidation reactor 21 through the first pipeline 61 for a catalytic oxidation reaction. The helium mixed with hydrogen undergoes a primary catalytic oxidation reaction with oxygen in the first catalytic oxidation reactor 21. In this embodiment, the amount of oxygen introduced into the first catalytic oxidation reactor 21 by the first oxygen supply assembly is only sufficient to consume approximately half of the hydrogen. The catalyst used in the reaction is a precious metal catalyst or a transition metal oxide catalyst.
[0032] After the catalytic oxidation reaction, the exhaust gas enters the first deoxidation reactor 22. This exhaust gas still contains hydrogen. This hydrogen undergoes a primary deoxidation reaction with the deoxidizer in the first deoxidation reactor 22. Part of the hydrogen reacts with the oxidized portion of the deoxidizer and is consumed. In this embodiment, the deoxidizer is a solid deoxidizer, such as copper wire or iron powder.
[0033] like Figure 1 As shown, in an embodiment of the present invention, the second oxidative dehydrogenation purification assembly includes: a second catalytic oxidation reactor 23, a second deoxygenation reactor 24, and a second oxygen supply assembly. The second catalytic oxidation reactor 23 is connected to the first deoxygenation reactor 22, the second deoxygenation reactor 24 is connected to the second catalytic oxidation reactor 23, and the second oxygen supply assembly is connected to the second catalytic oxidation reactor 23 to provide oxygen to the second catalytic oxidation reactor 23.
[0034] Specifically, the exhaust gas after the deoxygenation reaction enters the second catalytic oxidation reactor 23 and undergoes a secondary catalytic oxidation reaction with oxygen. In this embodiment, the amount of oxygen introduced into the second catalytic oxidation reactor 23 by the second oxygen supply component is slightly greater than that capable of reacting about half of the hydrogen. The catalyst used in the reaction is a precious metal catalyst or a transition metal oxide catalyst.
[0035] After the catalytic oxidation reaction, the tail gas enters the second deoxygenation reactor 24. This tail gas still contains hydrogen. The hydrogen undergoes a secondary deoxygenation reaction with the deoxidizer in the second deoxygenation reactor 24 to produce high-purity helium. This is the first mode of helium oxidation dehydrogenation purification.
[0036] Furthermore, after 12-24 hours of operation, since the first catalytic oxidation reactor 21 and the second catalytic oxidation reactor 23 are respectively in a reducing atmosphere and an oxidizing atmosphere for a long time, it is not conducive to maintaining the stability of the catalyst. At the same time, the deoxidizer in the second deoxygenation reactor 24 is partially oxidized. At this time, the catalytic oxidation reaction and the deoxygenation reaction can be carried out again.
[0037] Specifically, the pipeline assembly includes a second pipeline 62 and a third pipeline 63 . Both ends of the second pipeline 62 are respectively connected to the first pipeline 61 and the second catalytic oxidation reactor 23 . Both ends of the third pipeline 63 are respectively connected to the first pipeline 61 and the second deoxidation reactor 24 .
[0038] Helium is introduced into the second catalytic oxidation reactor 23 via the first and second pipelines 61 and 62. A second oxygen supply assembly introduces oxygen into the second catalytic oxidation reactor 23 in an amount sufficient to convert approximately half of the hydrogen into hydrogen. A catalytic oxidation reaction occurs in the second catalytic oxidation reactor 23 at a temperature of 100°C to 300°C. The resulting tail gas enters the second deoxygenation reactor 24 for a deoxygenation reaction. At this point, the hydrogen reacts with the oxidized portion of the deoxidizer and is consumed. The post-reaction tail gas enters the first catalytic oxidation reactor 21 via the third pipeline 63 and the first pipeline 61. The first oxygen supply assembly introduces oxygen into the first catalytic oxidation reactor 21 in an amount sufficient to convert approximately half of the hydrogen into hydrogen. A catalytic oxidation reaction occurs at a temperature of 100°C to 300°C. The post-reaction tail gas undergoes another deoxygenation reaction in the first deoxygenation reactor 22, producing high-purity helium. This is the second mode of helium oxidation-dehydrogenation purification.
[0039] In an embodiment of the present invention, the helium oxidative dehydrogenation purification apparatus further includes a preheater 40, disposed within the first pipeline 61, for preheating the helium flowing through the first pipeline 61. The preheated helium enters the first catalytic oxidation reactor 21, where a catalytic oxidation reaction occurs at a temperature of 100°C to 300°C. A heat exchanger is provided within the first catalytic oxidation reactor 21 to absorb the heat generated by the catalytic oxidation reaction, thereby preventing the temperature within the first catalytic oxidation reactor 21 from becoming excessively high, potentially leading to catalyst deactivation or explosion.
[0040] A heat exchanger is also provided in the second catalytic oxidation reactor 23. The reaction temperature of the exhaust gas in the second catalytic oxidation reactor 23 is 200°C-500°C. The heat generated by the catalytic oxidation reaction is absorbed by the heat exchanger, thereby ensuring that the temperature in the second catalytic oxidation reactor 23 is not too high, resulting in catalyst deactivation or explosion of the second catalytic oxidation reactor 23.
[0041] like Figure 1 As shown, in an embodiment of the present invention, the device for oxidative dehydrogenation and purification of helium also includes a first collector 31 and a second collector 32, which are used to collect high-purity helium, wherein the first collector 31 is connected to the second deoxygenation reactor 24, and the second collector 32 is connected to the first deoxygenation reactor 22.
[0042] like Figure 1 As shown, in an embodiment of the present invention, the first oxygen supply assembly includes: a second gas tank 12, a fourth pipeline 64, and a first disperser 51. The second gas tank 12 is used to store pure oxygen. The second gas tank 12 is connected to the first catalytic oxidation reactor 21 via the fourth pipeline 64. The first disperser 51 is disposed in the fourth pipeline 64. The pure oxygen enters the first catalytic oxidation reactor 21 after passing through the first disperser 51.
[0043] like Figure 1 As shown, the second oxygen supply assembly includes a third gas tank 13, a fifth pipeline 65, and a second disperser 52. The third gas tank 13 is used to store pure oxygen and is connected to the second catalytic oxidation reactor 23 via the fifth pipeline 65. The second disperser 52 is disposed in the fifth pipeline 65. After passing through the second disperser 52, the pure oxygen enters the second catalytic oxidation reactor 23.
[0044] like Figure 1 As shown, in an embodiment of the present invention, the helium oxidative dehydrogenation purification device further includes a plurality of valves, including a first valve 71, a second valve 72, a third valve 73, a fourth valve 74, a fifth valve 75, a sixth valve 76, a seventh valve 77, and an eighth valve 78.
[0045] The first valve 71 is arranged on the first pipeline 61, used to control the connection and disconnection between the first gas storage tank 11 and the first catalytic oxidation reactor 21; the second valve 72 is arranged on the second pipeline 62, used to control the connection and disconnection between the first gas storage tank 11 and the second catalytic oxidation reactor 23; the third valve 73 is arranged on the third pipeline 63, used to control the connection and disconnection between the first pipeline 61 and the second deoxygenation reactor 24; the fourth valve 74 is arranged on the fourth pipeline 64, used to control the connection and disconnection between the second gas storage tank 12 and the first catalytic oxidation reactor 21; the fifth valve 75 is arranged on the fifth pipeline 65, used to control the connection and disconnection between the third gas storage tank 13 and the second catalytic oxidation reactor 23.
[0046] The helium oxidative dehydrogenation purification apparatus further includes a sixth pipeline 66, a seventh pipeline 67, and an eighth pipeline 68. The sixth pipeline 66 is used to connect the first deoxygenation reactor 22 and the second catalytic oxidation reactor 23, the seventh pipeline 67 is used to connect the first deoxygenation reactor 22 and the second collector 32, and the eighth pipeline 68 is used to connect the second deoxygenation reactor 24 and the first collector 31. A sixth valve 76 is provided in the sixth pipeline 66, a seventh valve 77 is provided in the seventh pipeline 67, and an eighth valve 78 is provided in the eighth pipeline 68.
[0047] In the first mode, the first valve 71, the sixth valve 76, and the eighth valve 78 are open, and the second valve 72, the third valve 73, and the seventh valve 77 are closed. The helium in the first gas storage tank 11 enters the first catalytic oxidation reactor 21 through the first pipeline 61 for a catalytic oxidation reaction. The amount of oxygen introduced into the first catalytic oxidation reactor 21 by the first oxygen supply component is only sufficient to react with about half of the hydrogen. The exhaust gas after the deoxygenation reaction enters the second catalytic oxidation reactor 23 and undergoes a secondary catalytic oxidation reaction with oxygen. The amount of oxygen introduced into the second catalytic oxidation reactor 23 by the second oxygen supply component is slightly greater than that required to react with about half of the hydrogen. After the catalytic oxidation reaction, the exhaust gas enters the second deoxygenation reactor 24. The exhaust gas still contains hydrogen, which undergoes a secondary deoxygenation reaction with the deoxidizer in the second deoxygenation reactor 24 to obtain high-purity helium, which is collected by the first collector 31.
[0048] In the second mode, the first valve 71 and the eighth valve 78 are closed, and the second valve 72 and the third valve 73 are opened. The helium in the first gas storage tank 11 enters the second catalytic oxidation reactor 23 through the first pipeline 61 and the second pipeline 62. The second oxygen supply assembly introduces oxygen into the second catalytic oxidation reactor 23 in an amount sufficient to convert approximately half of the hydrogen into hydrogen, and a catalytic oxidation reaction occurs in the second catalytic oxidation reactor 23. The resulting exhaust enters the second deoxygenation reactor 24 for a deoxygenation reaction.
[0049] With seventh valve 77 open and sixth valve 76 closed, the post-reaction exhaust gas enters first catalytic oxidation reactor 21 through third pipeline 63 and first pipeline 61. Oxygen is introduced into first catalytic oxidation reactor 21 by the first oxygen supply assembly to initiate a catalytic oxidation reaction. The post-reaction exhaust gas undergoes further deoxygenation in first deoxygenation reactor 22, producing high-purity helium, which is collected by second collector 32.
[0050] Because the helium oxidative dehydrogenation purification apparatus provided in the embodiments of the present invention switches back and forth between two modes for helium purification, one catalytic oxidation reactor is always in a reducing atmosphere during the purification process. Therefore, if the catalyst active sites are noble metals, they are prone to agglomeration at high temperatures, while if they are metal oxide sites, they are easily over-reduced and lose their activity. Therefore, in the embodiments of the present invention, the catalyst must be resistant to agglomeration and thermally stable in a reducing atmosphere. For this reason, the catalyst is generally a supported catalyst, comprising a support and an active component. The support comprises a mass fraction of 85% to 99.8% and a specific surface area of 200 to 1500 m2 / g. The support includes, but is not limited to, alumina and molecular sieve materials. Because oxygen concentrations are low during catalyst use, the support must have good oxygen transfer capacity. Therefore, the support can be modified with additives such as Ce, Zr, and La that have good oxygen transfer capabilities. The additives can be added during support synthesis or during support formation. The amount of additive added is 1% to 5% of the support mass. The catalytic active sites must have a strong dissociative adsorption capacity for H2. The active components used in the catalyst material can be precious metals such as Pd, Pt, Ru, Ag, etc., with a mass fraction of 0.2 to 1%; or they can be bimetallic alloys such as NiMo, CoMo, NiCu, etc., with a mass fraction of 2% to 15%.
[0051] The helium oxidation dehydrogenation purification device provided by the embodiment of the present invention divides the reaction zone into two parts, namely, a secondary catalytic oxidation reaction and a deoxygenation reaction, thereby ensuring that the temperature rise during the catalytic oxidation process is not too high; on the other hand, the first catalytic oxidation reactor when helium is introduced for the first time and the second catalytic oxidation reactor when helium is introduced for the second time can maintain the reduced state of the catalyst active center under a reducing atmosphere, thereby preventing particle aggregation caused by an oxidizing atmosphere under long-term operation.
[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.
Claims
1. A device for oxidative dehydrogenation and purification of helium, characterized in that: include: a first gas storage tank, a first pipeline, an oxidative dehydrogenation purification unit, and a heat exchanger; The first gas storage tank is used to store helium, and the first gas storage tank is connected to the oxidative dehydrogenation purification unit through the first pipeline. The oxidative dehydrogenation purification unit is used to react with hydrogen in the helium to purify the helium; The heat exchanger is arranged in the oxidative dehydrogenation purification unit, and is used to absorb the heat generated during the oxidation reaction.
2. The helium oxidative dehydrogenation purification device according to claim 1, characterized in that: Also included is a pipeline assembly, wherein the oxidative dehydrogenation purification unit comprises: a first oxidative dehydrogenation purification assembly and a second oxidative dehydrogenation purification assembly; The first oxidative dehydrogenation purification component is connected to the first pipeline, the second oxidative dehydrogenation purification component is connected to the first oxidative dehydrogenation purification component, and both ends of the pipeline component are connected to the second oxidative dehydrogenation purification component and the first pipeline respectively.
3. The helium oxidative dehydrogenation purification device according to claim 2, characterized in that: The first oxidative dehydrogenation purification component includes: a first catalytic oxidation reactor, a first deoxygenation reactor and a first oxygen supply component; The first catalytic oxidation reactor is connected to the first pipeline, the first deoxygenation reactor is connected to the first catalytic oxidation reactor and the second oxidative dehydrogenation purification component, and the first oxygen supply component is connected to the first catalytic oxidation reactor; The first oxygen supply component is used to provide oxygen to the first catalytic oxidation reactor, and the heat exchanger is provided in the first catalytic oxidation reactor.
4. The helium oxidative dehydrogenation purification device according to claim 3, characterized in that: The second oxidative dehydrogenation purification component includes: a second catalytic oxidation reactor, a second deoxygenation reactor and a second oxygen supply component; The second catalytic oxidation reactor is connected to the first deoxygenation reactor, the second deoxygenation reactor is connected to the second catalytic oxidation reactor, the second oxygen supply assembly is connected to the second catalytic oxidation reactor, and the second catalytic oxidation reactor and the second deoxygenation reactor are connected to the first pipeline via the pipeline assembly; The second oxygen supply assembly is used to provide oxygen to the second catalytic oxidation reactor, and the heat exchanger is provided in the second catalytic oxidation reactor.
5. The helium oxidative dehydrogenation purification device according to claim 4, characterized in that: The pipeline assembly includes: a second pipeline and a third pipeline; Both ends of the second pipeline are connected to the first pipeline and the second catalytic oxidation reactor respectively; Both ends of the third pipeline are connected to the first pipeline and the second deoxygenation reactor respectively.
6. The helium oxidative dehydrogenation purification device according to claim 1, characterized in that: It also includes a preheater, which is arranged in the first pipeline and is used to preheat the helium.
7. The helium oxidative dehydrogenation purification device according to claim 3, characterized in that: The first oxygen supply assembly includes: a second gas storage tank, a fourth pipeline and a first disperser; The second gas storage tank is connected to the first catalytic oxidation reactor through the fourth pipeline, and the first disperser is arranged on the fourth pipeline.
8. The helium oxidative dehydrogenation purification device according to claim 4, characterized in that: The second oxygen supply assembly includes: a third gas storage tank, a fifth pipeline and a second disperser; The third gas storage tank is connected to the second catalytic oxidation reactor through the fifth pipeline, and the second disperser is arranged on the fifth pipeline.
9. The helium oxidative dehydrogenation purification device according to claim 4, characterized in that: The system further comprises a plurality of collectors, wherein the plurality of collectors are respectively connected to the first deoxygenation reactor and the second deoxygenation reactor.
10. The helium oxidative dehydrogenation purification device according to claim 2, characterized in that: It also includes a plurality of valves, which are respectively arranged on the first pipeline and the pipeline assembly.