Gas dehydration system and gas dehydration process
By designing a gas dehydration system including a combustion chamber, a filtration device, a cooling tower and a dehydration device, the problem that traditional processes cannot meet the ultra-low water content requirements is solved, and the water content of rare gas is reduced to below 0.1ppm, meeting the aerospace Industry demand.
Patent Information
- Application Number
- CN202411766013.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-04
- Publication Date
- 2025-02-07
AI Technical Summary
Traditional rare gas purification and dehydration processes cannot reduce the water content of rare gas to the aerospace industry's requirements for ultra-low water content, and it is difficult to meet the water content requirements of rare gases in the aerospace industry.
A gas dehydration system is designed, including a combustion chamber, a filtration device, a cooling tower and a dehydration device. The first mixed gas is generated by combusting the raw material gas through the combustion chamber, and the filtering device obtains the second mixed gas. The cooling tower separates Kr and cools H2O to a solid state. The dehydration device condenses and adsorbs H2O in the liquid mixed gas.
The water content of rare gas is reduced to below 0.1ppm, meeting the ultra-low water content requirements of the aerospace industry for rare gases.
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Figure CN119386637A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of gas drying, and in particular to a gas dehydration system and a gas dehydration process applied to the gas dehydration system. Background Art
[0002] In the related technology, the aerospace industry usually needs to use high-purity, ultra-low water content rare gases, and the aerospace industry requires the water content of rare gases to be below 0.1ppm. The traditional rare gas purification and dehydration process is to purify and dehydrate the rare gases through molecular sieves. Molecular sieves can purify rare gases but can only reduce the water content of rare gases to 2ppm, which cannot meet the ultra-low water content requirements of the aerospace industry. Therefore, the traditional gas dehydration process is difficult to meet the ultra-low water content requirements of the aerospace industry for rare gases. Summary of the invention
[0003] In order to reduce the water content of the rare gas to below 0.1 ppm so that the water content of the rare gas can meet the requirements of the aerospace industry, the present application provides a gas dehydration system.
[0004] The present application further proposes a gas dehydration process.
[0005] The gas dehydration system provided in this application adopts the following technical solution: A gas dehydration system comprises: a combustion chamber and a filtering device, wherein the filtering device is connected to the combustion chamber, and a raw gas flows into the combustion chamber. The combustion chamber is used to burn the raw gas to obtain a first mixed gas, and the filtering device is used to filter the first mixed gas to obtain a second mixed gas, wherein the second mixed gas comprises Xe, Kr and H2O.
[0006] A cooling tower, wherein the cooling tower has a first air inlet, a first air outlet and a second air outlet, the filtering device is connected to the first air inlet, the cooling tower is used to separate Kr in the second mixed gas to obtain a liquid mixed gas, Kr flows out of the cooling tower through the first air outlet, and the liquid mixed gas flows out of the cooling tower through the second air outlet, and the liquid mixed gas includes Xe and H2O.
[0007] A dehydration device, the dehydration device includes a cooling tank and a first adsorption component, the cooling tank is connected between the second gas outlet and the first adsorption component, a cooling medium below a preset temperature is provided in the cooling tank, the cooling tank is used to condense H2O in the liquid mixed gas, and the first adsorption component is used to adsorb H2O in the liquid mixed gas.
[0008] A first filling device, wherein the first filling device is connected to the first adsorption component, and the first filling device is used to fill the liquid mixed gas into the gas cylinder.
[0009] By adopting the above technical solution, the Xe in the second mixed gas is cooled to a liquid state through a cooling tower, and the H2O in the second mixed gas is cooled to a solid state to obtain a liquid mixed gas, and the H2O in the liquid mixed gas is condensed through a cooling tank, and the solid H2O in the liquid mixed gas is adsorbed by the first adsorption component. Compared with the prior art, the present application can reduce the water content of the rare gas to below 0.1ppm, so that the water content of the rare gas can meet the rare gas water content requirements of the aerospace industry.
[0010] Preferably, the dehydration device also includes: a first control valve, a water content detection component and a controller, the first control valve is connected between the first filling device and the first adsorption component, the cooling tank has a second air inlet, the second air inlet is connected to the second air outlet, the first control valve includes a first input end, a first output end and a second output end, the first input end is connected to the first adsorption component, the first output end is connected to the first filling device, and the second output end is connected to the second air inlet, the first control valve is used to connect or block the first input end and the first output end, and to connect or block the first input end and the second output end, the water content detection component is connected between the first input end and the first adsorption component, the water content detection component is used to detect the water content of the liquid mixed gas, the controller is communicatively connected to the first control valve and the water content detection component, and the controller is used to control the working state of the first control valve according to the detection signal of the water content detection component.
[0011] By adopting the above technical solution, when the water content in the liquid mixed gas is higher than or equal to the preset water content, the water content detection component generates a first detection signal, and the controller controls the first control valve to block the first input end and the first output end, and connect the first input end and the second output end according to the first detection signal of the water content detection component, and the liquid mixed gas flows back into the cooling tank, the cooling tank condenses the H2O in the liquid mixed gas, and the first adsorption component adsorbs the solid H2O in the liquid mixed gas, thereby preventing the water content of the liquid mixed gas from being higher than the preset water content, and avoiding the water content of the liquid mixed gas from failing to meet the rare gas water content requirements of the aerospace industry.
[0012] Preferably, the dehydration device also includes: a second control valve, the second control valve is connected between the second air inlet and the second air outlet, the second control valve includes a second input end, a third input end and a third output end, the second input end is connected to the second air outlet, the third input end is connected to the second output end, the third output end is connected to the second air inlet, the second control valve is used to connect or block the second input end and the third output end, and connect or block the third input end and the third output end, the second control valve is communicatively connected to the controller, and the controller is used to control the working state of the second control valve according to the working state of the first control valve.
[0013] By adopting the above technical scheme, when the first control valve blocks the first input end and the first output end, and connects the first input end and the second output end, the controller controls the second control valve to block the second input end and the third output end, and connects the third input end and the third output end, the liquid mixed gas in the cooling tower stops flowing into the cooling tank, and the liquid mixed gas flowing out of the first adsorption component flows back into the cooling tank, thereby preventing the liquid mixed gas in the cooling tower and the liquid mixed gas flowing back into the cooling tank from mixing, preventing the liquid mixed gas in the cooling tower from increasing the water content of the liquid mixed gas flowing back into the cooling tank, thereby improving the dehydration efficiency of the gas dehydration system, and improving the working reliability of the gas dehydration system.
[0014] Preferably, the dehydration device also includes: a third control valve, the first adsorption assembly includes a plurality of first molecular sieves, the plurality of first molecular sieves are arranged at intervals, the plurality of first molecular sieves are all connected to the first filling device, the third control valve is connected between the first adsorption assembly and the cooling tank, the third control valve is used to control the liquid mixed gas output from the cooling tank to flow into the first molecular sieve in an unsaturated state, and the first molecular sieve is used to adsorb H2O in the liquid mixed gas.
[0015] By adopting the above technical solution, when one or part of the multiple first molecular sieves are in a saturated state, the third control valve controls the liquid mixed gas flowing out of the cooling tank to flow into the first molecular sieve in an unsaturated state, so that the first molecular sieve in an unsaturated state adsorbs H2O in the liquid mixed gas. Compared with setting a single first molecular sieve, when the single first molecular sieve is in a saturated state, the gas dehydration system needs to stop working to wait for the first molecular sieve to be regenerated. Such a setting can improve the working efficiency of the gas dehydration system.
[0016] Preferably, the filtering device includes a thermal diffusion tube, the thermal diffusion tube having a first end and a second end opposite to each other, the first end being provided with a third air inlet and a third air outlet, the second end being provided with a fourth air outlet, the third air inlet being communicated with the combustion chamber, the third air outlet being communicated with the first air inlet, the temperature of the first end being higher than the temperature of the second end, the first mixed gas including Xe, Kr, CO2, H2O and O2, the Xe, Kr and H2O of a first preset concentration in the first mixed gas being gathered at the first end to obtain the second mixed gas, the second mixed gas flowing into the cooling tower through the third air outlet, the CO2, O2 and H2O of a second preset concentration in the first mixed gas being gathered at the second end and flowing out of the thermal diffusion tube through the fourth air outlet, the first preset concentration being less than the second preset concentration.
[0017] By adopting the above technical scheme, under the action of the temperature gradient between the first end and the second end, the gas with larger molecular weight in the first mixed gas is collected at the first end, and the gas with smaller molecular weight is collected at the second end, that is, Xe, Kr and H2O of the first preset concentration in the first mixed gas are collected at the first end, and CO2, O2 and H2O of the second preset concentration in the first mixed gas are collected at the second end, thereby achieving the technical effect of separating CO2 and O2 from the first mixed gas to obtain the second mixed gas.
[0018] Preferably, the filtering device also includes a fourth control valve, there are multiple thermal diffusion tubes, and the multiple thermal diffusion tubes are arranged at intervals. The fourth control valve is connected between the multiple thermal diffusion tubes and the combustion chamber, and the fourth control valve is used to control the flow direction of the first mixed gas so that the first mixed gas flows into the thermal diffusion tubes that do not store the first mixed gas.
[0019] By adopting the above technical solution, during the process of separating CO2 and O2 in the first mixed gas by the thermal diffusion tube, the combustion chamber stops supplying the first mixed gas to the thermal diffusion tube storing the first mixed gas, and by providing a plurality of thermal diffusion tubes and the fourth control valve, the fourth control valve controls the first mixed gas to flow into the thermal diffusion tube where the first mixed gas is not stored, thereby achieving the technical effect of the gas dehydration system continuously separating CO2 and O2 in the first mixed gas, thereby improving the working efficiency of the gas dehydration system.
[0020] Preferably, a one-way membrane is provided between the first end and the second end, and the one-way membrane is used to prevent CO2 and O2 located at the second end from flowing to the first end.
[0021] By adopting the above technical solution, the unidirectional membrane is used to prevent O2 and CO2 located at the second end from flowing to the first end, thereby preventing O2 and CO2 from mixing into the second mixed gas, reducing the time for the thermal diffusion tube to separate the first mixed gas, and further improving the working efficiency of the gas dehydration system.
[0022] Preferably, the filtering device further comprises a second adsorption component, the second adsorption component is connected between the thermal diffusion tube and the combustion chamber, the second adsorption component comprises a second molecular sieve, a third molecular sieve and a fourth molecular sieve, the first mixed gas sequentially passes through the second molecular sieve, the third molecular sieve and the fourth molecular sieve and flows into the thermal diffusion tube, the second molecular sieve is used to adsorb H2O in the first mixed gas, the third molecular sieve is used to adsorb O in the first mixed gas 2， The fourth molecular sieve is used for adsorbing CO2 in the first mixed gas.
[0023] By adopting the above technical solution, the second molecular sieve adsorbs H2O in the first mixed gas, the third molecular sieve adsorbs O2 in the first mixed gas, and the fourth molecular sieve adsorbs CO2 in the first mixed gas, thereby reducing the content of H2O, O2 and CO2 in the first mixed gas, thereby reducing the time for the thermal diffusion tube to separate CO2 and O2 in the first mixed gas, and improving the working efficiency of the gas dehydration system.
[0024] A gas dehydration process provided in this application adopts the following technical solution: A gas dehydration process, which is applicable to the above-mentioned gas dehydration system, comprises: burning raw gas to obtain a first mixed gas, filtering the first mixed gas to obtain a second mixed gas, wherein the second mixed gas comprises Xe, Kr and H2O; cooling and separating Kr in the second mixed gas to obtain a liquid mixed gas, wherein the liquid mixed gas comprises Xe and H2O; condensing the liquid mixed gas, and adsorbing H2O in the liquid mixed gas; and filling the liquid mixed gas into a gas cylinder.
[0025] By adopting the above technical solution, the Kr in the second mixed gas is separated by cooling through a cooling tower, and the H2O in the second mixed gas is cooled to a solid state to obtain a liquid mixed gas, the cooling tank further condenses the H2O in the liquid mixed gas, and the first adsorption component adsorbs the H2O in the liquid mixed gas. Compared with the prior art, the present application can reduce the water content of the rare gas to below 0.1ppm, so that the water content of the rare gas can meet the rare gas water content requirements of the aerospace industry.
[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. Cooling the Xe in the second mixed gas to a liquid state through a cooling tower, and cooling the H2O in the second mixed gas to a solid state, to obtain a liquid mixed gas, and condensing the H2O in the liquid mixed gas through a cooling tank, and adsorbing the solid H2O in the liquid mixed gas through a first adsorption component. Compared with the prior art, the present application can reduce the water content of the rare gas to below 0.1ppm, so that the water content of the rare gas can meet the rare gas water content requirements of the aerospace industry; 2. When one or part of the multiple first molecular sieves is in a saturated state, the third control valve controls the liquid mixed gas flowing out of the cooling tank to flow into the first molecular sieve in an unsaturated state, so that the first molecular sieve in an unsaturated state adsorbs H2O in the liquid mixed gas. Compared with setting a single first molecular sieve, when a single first molecular sieve is in a saturated state, the gas dehydration system needs to stop working to wait for the first molecular sieve to regenerate. Such a setting can improve the working efficiency of the gas dehydration system; 3. Under the action of the temperature gradient between the first end and the second end, the gas with a larger molecular weight in the first mixed gas is gathered at the first end, and the gas with a smaller molecular weight is gathered at the second end. That is to say, Xe, Kr and H2O of a first preset concentration in the first mixed gas are gathered at the first end, and CO2, O2 and H2O of a second preset concentration in the first mixed gas are gathered at the second end, thereby achieving the technical effect of separating CO2 and O2 from the first mixed gas to obtain the second mixed gas. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] Figure 1 is a schematic diagram of a gas dehydration system according to an embodiment of the present application; Figure 2 is a schematic diagram of a first adsorption component and a third control valve according to an embodiment of the present application; Figure 3 is a schematic diagram of a heat diffusion tube and a fourth control valve according to an embodiment of the present application; Figure 4 It is a flow chart of the gas dehydration process according to an embodiment of the present application.
[0028] Description of reference numerals: 100. Gas dehydration system; 1. Combustion chamber; 2. Filter device; 21. Heat diffusion tube; 211. First end; 212. Second end; 213. Third air inlet; 214. Third air outlet; 215. Fourth air outlet; 216. One-way membrane; 22. Fourth control valve; 23. Second adsorption assembly; 231. Second molecular sieve; 232. Third molecular sieve; 233. Fourth molecular sieve; 3. Cooling tower; 31. First air inlet; 32. First air outlet; 33. Second air outlet; 4. Dehydration device; 41. Cooling tank; 411. Second air inlet; 42. First adsorption assembly; 421. First molecular sieve; 43. First control valve; 431. First input end; 432. First output end; 433. Second output end; 44. Water content detection element; 45. Second control valve; 451. Second input end; 452. Third input end; 453. Third output end; 46. Third control valve; 5. The first filling device; 6. The second filling device. DETAILED DESCRIPTION
[0029] The following is combined with Figure 1-Figure 4 This application is described in further detail.
[0030] The embodiment of the present application discloses a gas dehydration system 100 .
[0031] Reference Figure 1 According to the embodiment of the present application, the gas dehydration system 100 includes: a combustion chamber 1, a filter device 2, a cooling tower 3, a dehydration device 4 and a first loading device 5. The filter device 2 is connected to the combustion chamber 1, and the raw gas flows into the combustion chamber 1. The combustion chamber 1 is used to burn the raw gas to obtain a first mixed gas. Specifically, the raw gas includes Xe, Kr, O2 and hydrocarbon gas. The hydrocarbon gas is fully burned in the combustion chamber 1, and the hydrocarbon gas is converted into CO2 and H2O, so that the technical effect of removing hydrocarbon gas from the raw gas can be achieved, and the raw gas can be preliminarily purified. The first mixed gas includes Xe, Kr, O2, CO2 and H2O.
[0032] In some specific embodiments, the hydrocarbon gas may be methane, but the present application is not limited thereto, and the hydrocarbon gas may also be ethane or the like.
[0033] In some specific embodiments, the combustion temperature of the combustion chamber 1 is 400°C-450°C.
[0034] In addition, the filter device 2 is used to filter the first mixed gas to obtain a second mixed gas. The first mixed gas flows from the combustion chamber 1 into the filter device 2. The filter device 2 is used to filter CO2, O2 and H2O of a second preset concentration in the first mixed gas to obtain a second mixed gas. The second mixed gas includes Xe, Kr and H2O, thereby achieving the technical effect of further purifying the first mixed gas and performing preliminary dehydration treatment on the first mixed gas.
[0035] It should be noted that the filter device 2 can filter most of the H2O in the first mixed gas, and only a small amount of H2O exists in the second mixed gas.
[0036] In some specific embodiments, the water content of the second mixed gas is 2 ppm, and the second preset concentration is 10 ppm.
[0037] The cooling tower 3 has a first air inlet 31, a first air outlet 32 and a second air outlet 33. The filter device 2 is connected to the first air inlet 31. The cooling tower 3 is used to separate Kr from the second mixed gas to obtain a liquid mixed gas. Kr flows out of the cooling tower 3 through the first air outlet 32, and the liquid mixed gas flows out of the cooling tower 3 through the second air outlet 33. The liquid mixed gas includes Xe and H2O.
[0038] Specifically, the second mixed gas flows from the filtering device 2 into the cooling tower 3 through the first air inlet 31, and the cooling tower 3 cools the second mixed gas. The cooling tower 3 cools the Xe in the second mixed gas to a liquid state, and cools the H2O in the second mixed gas to a solid state, and the Kr in the second mixed gas is maintained in a gaseous state, thereby achieving a technical effect of separating Kr from the second mixed gas to obtain a liquid mixed gas. The Kr in the second mixed gas flows out of the cooling tower 3 through the first air outlet 32, and the liquid mixed gas flows out of the cooling tower 3 through the second air outlet 33, thereby achieving a technical effect of further purifying the first mixed gas.
[0039] It should be noted that the temperature of the cooling tower 3 is lower than the boiling point of Xe and higher than the boiling point of Kr. In some specific embodiments, the temperature of the cooling tower 3 can be -120°C, but the present application is not limited thereto. The temperature of the cooling tower 3 can also be -140°C, etc.
[0040] Furthermore, the gas dehydration system 100 may further include a second filling device 6 , which is connected to the first gas outlet 32 , and is used to fill Kr into the gas cylinder.
[0041] The dehydration device 4 includes a cooling tank 41 and a first adsorption component 42. The cooling tank 41 is connected between the second gas outlet 33 and the first adsorption component 42. The liquid mixed gas flows into the cooling tank 41 through the second gas outlet 33. The cooling tank 41 is provided with a cooling medium whose temperature is lower than a preset temperature. The cooling tank 41 is used to condense H2O in the liquid mixed gas. The liquid mixed gas condensed by the cooling tank 41 flows into the first adsorption component 42. The first adsorption component 42 is used to adsorb H2O in the liquid mixed gas.
[0042] Specifically, the cooling tank 41 condenses the H2O in the liquid mixed gas to further condense the H2O in the liquid mixed gas into solid H2O. The liquid mixed gas after condensation flows into the first adsorption component 42. The first adsorption component 42 adsorbs the solid H2O in the liquid mixed gas to reduce the water content in the liquid mixed gas to below 0.1ppm, so that the water content of Xe in the liquid mixed gas can meet the ultra-low water content requirements of the aerospace industry for rare gases.
[0043] In some specific embodiments, the cooling medium may be liquid nitrogen and the preset temperature may be -180°C.
[0044] The first filling device 5 is connected to the first adsorption assembly 42 , and the liquid mixed gas adsorbed by the first adsorption assembly 42 flows into the first filling device 5 . The first filling device 5 is used to fill Xe in the liquid mixed gas into the gas cylinder.
[0045] Thus, the Xe in the second mixed gas is cooled to a liquid state through the cooling tower 3, and the H2O in the second mixed gas is cooled to a solid state to obtain a liquid mixed gas, and the H2O in the liquid mixed gas is condensed through the cooling tank 41, and the solid H2O in the liquid mixed gas is adsorbed through the first adsorption assembly 42. Compared with the prior art, the present application can reduce the water content of the rare gas to below 0.1ppm, so that the water content of the rare gas can meet the rare gas water content requirements of the aerospace industry.
[0046] Reference Figure 1 In some embodiments of the present application, the dehydration device 4 may also include: a first control valve 43, a water content detection component 44 and a controller, the first control valve 43 is connected between the first filling device 5 and the first adsorption component 42, the cooling tank 41 has a second air inlet 411, the second air inlet 411 is connected to the second air outlet 33, and the liquid mixed gas flows into the cooling tank 41 through the second air outlet 33 and the second air inlet 411.
[0047] The first control valve 43 includes a first input end 431, a first output end 432 and a second output end 433. The first input end 431 is connected to the first adsorption component 42, the first output end 432 is connected to the first filling device 5, and the second output end 433 is connected to the second air inlet 411. The first control valve 43 is used to connect or block the first input end 431 and the first output end 432, and to connect or block the first input end 431 and the second output end 433. The water content detection component 44 is connected between the first input end 431 and the first adsorption component 42. The water content detection component 44 is used to detect the water content of the liquid mixed gas. The controller is communicatively connected to the first control valve 43 and the water content detection component 44. The controller is used to control the working state of the first control valve 43 according to the detection signal of the water content detection component 44.
[0048] Specifically, when the liquid mixed gas flows out of the first adsorption component 42, the water content detection component 44 detects the water content in the liquid mixed gas. When the water content in the liquid mixed gas is higher than or equal to the preset water content, the water content detection component 44 generates a first detection signal. The controller controls the first control valve 43 to block the first input end 431 and the first output end 432, and connect the first input end 431 and the second output end 433 according to the first detection signal of the water content detection component 44. The liquid mixed gas flows back into the cooling tank 41, and the cooling tank 41 condenses the H2O in the liquid mixed gas. The first adsorption component 42 adsorbs the solid H2O in the liquid mixed gas, thereby preventing the water content of the liquid mixed gas from being higher than the preset water content, and avoiding the water content of the liquid mixed gas from failing to meet the rare gas water content requirements of the aerospace industry.
[0049] When the water content in the liquid mixed gas is lower than the preset water content, the water content detection component 44 generates a second detection signal, and the controller controls the first control valve 43 to connect the first input end 431 and the first output end 432, and block the first input end 431 and the second output end 433 according to the second detection signal of the water content detection component 44, and the liquid mixed gas flows into the first filling device 5.
[0050] It should be noted that when the first control valve 43 blocks the first input end 431 and the first output end 432, and connects the first input end 431 and the second output end 433, the liquid mixed gas in the cooling tower 3 stops flowing into the cooling tank 41. When the first control valve 43 connects the first input end 431 and the first output end 432, and blocks the first input end 431 and the second output end 433, the liquid mixed gas in the cooling tower 3 flows into the cooling tank 41.
[0051] In some specific embodiments, the preset water content may be 0.1 ppm.
[0052] In some specific embodiments, the moisture content detection component 44 may be an online moisture analyzer, etc., and the first control valve 43 may be a directional control valve, etc.
[0053] Reference Figure 1 In some embodiments of the present application, the dehydration device 4 may also include: a second control valve 45, the second control valve 45 is connected between the second air inlet 411 and the second air outlet 33, the second control valve 45 includes a second input end 451, a third input end 452 and a third output end 453, the second input end 451 is connected to the second air outlet 33, the third input end 452 is connected to the second output end 433, and the third output end 453 is connected to the second air inlet 411, the second control valve 45 is used to connect or block the second input end 451 and the third output end 453, and to connect or block the third input end 452 and the third output end 453, the second control valve 45 is communicatively connected to the controller, and the controller is used to control the working state of the second control valve 45 according to the working state of the first control valve 43.
[0054] Specifically, when the first control valve 43 blocks the first input end 431 and the first output end 432, and connects the first input end 431 and the second output end 433, the controller controls the second control valve 45 to block the second input end 451 and the third output end 453, and connects the third input end 452 and the third output end 453, the liquid mixed gas in the cooling tower 3 stops flowing into the cooling tank 41, and the liquid mixed gas flowing out of the first adsorption component 42 flows back into the cooling tank 41, thereby preventing the liquid mixed gas in the cooling tower 3 and the liquid mixed gas flowing back into the cooling tank 41 from mixing, and preventing the liquid mixed gas in the cooling tower 3 from increasing the water content of the liquid mixed gas flowing back into the cooling tank 41, thereby improving the dehydration efficiency of the gas dehydration system 100, and improving the working reliability of the gas dehydration system 100.
[0055] When the first control valve 43 connects the first input end 431 and the first output end 432, and blocks the first input end 431 and the second output end 433, the controller controls the second control valve 45 to connect the second input end 451 and the third output end 453, and blocks the third input end 452 and the third output end 453, and the liquid mixed gas in the cooling tower 3 flows into the cooling tank 41.
[0056] Furthermore, a hydraulic pump may be provided in the cooling tank 41 , and the hydraulic pump is used to transport the liquid mixed gas to the first adsorption assembly 42 .
[0057] In some specific embodiments, the second control valve 45 may be a directional control valve or the like.
[0058] Reference Figure 1 and Figure 2In some embodiments of the present application, the dehydration device 4 may further include: a third control valve 46, the first adsorption component 42 includes a plurality of first molecular sieves 421, the plurality of first molecular sieves 421 are arranged at intervals, and the plurality of first molecular sieves 421 are all connected to the first filling device 5, and the third control valve 46 is connected between the first adsorption component 42 and the cooling tank 41, that is, the discharge end of each first molecular sieve 421 is connected to the first filling device 5, and the feed end of each first molecular sieve 421 is connected to the third control valve 46.
[0059] Specifically, the third control valve 46 has a first feed port and multiple second feed ports. The first feed port of the third control valve 46 is connected to the cooling tank 41, and the multiple second feed ports are arranged one by one corresponding to the multiple first molecular sieves 421. The feed end of the first molecular sieve 421 is connected to the corresponding second feed port.
[0060] The third control valve 46 is used to control the liquid mixed gas output from the cooling tank 41 to flow into the first molecular sieve 421 in an unsaturated state. The first molecular sieve 421 is used to adsorb H 2 O in the liquid mixed gas.
[0061] Specifically, after the first molecular sieve 421 has adsorbed H2O in the liquid mixed gas for a long time, the first molecular sieve 421 is in a saturated state. The first molecular sieve 421 in the saturated state can no longer adsorb H2O in the liquid mixed gas. The first molecular sieve 421 in the saturated state needs to be regenerated to change the first molecular sieve 421 from the saturated state to the unsaturated state.
[0062] When one or part of the multiple first molecular sieves 421 are in a saturated state, the third control valve 46 controls the liquid mixed gas flowing out of the cooling tank 41 to flow into the first molecular sieve 421 in an unsaturated state, so that the first molecular sieve 421 in an unsaturated state adsorbs H2O in the liquid mixed gas. Compared with setting a single first molecular sieve 421, when a single first molecular sieve 421 is in a saturated state, the gas dehydration system 100 needs to stop working to wait for the first molecular sieve 421 to be regenerated. Such a setting can improve the working efficiency of the gas dehydration system 100.
[0063] In some specific embodiments, the first molecular sieve 421 may be a 3A molecular sieve, but the present application is not limited thereto, and the first molecular sieve 421 may also be a 4A molecular sieve, etc.
[0064] In some specific embodiments, the third control valve 46 may be a directional control valve or the like.
[0065] Reference Figure 1In some embodiments of the present application, the filter device 2 includes a heat diffusion tube 21, and the heat diffusion tube 21 has a first end 211 and a second end 212 opposite to each other. Along the air intake direction of the heat diffusion tube 21, the left end of the heat diffusion tube 21 is the first end 211, and the right end of the heat diffusion tube 21 is the second end 212. The air intake direction of the diffusion tube can refer to Figure 3 The left-right direction in the direction from left to right.
[0066] The first end 211 is provided with a third air inlet 213 and a third air outlet 214, and the second end 212 is provided with a fourth air outlet 215. The third air inlet 213 is connected to the combustion chamber 1, and the third air outlet 214 is connected to the first air inlet 31. The temperature of the first end 211 is higher than the temperature of the second end 212. In some specific embodiments, the temperature of the first end 211 can be 450°C, and the temperature of the second end 212 can be 80°C.
[0067] The first mixed gas includes Xe, Kr, CO2, H2O and O2. Xe, Kr and H2O of a first preset concentration in the first mixed gas are collected at the first end 211 to obtain a second mixed gas. The second mixed gas flows into the cooling tower 3 through the third gas outlet 214. CO2, O2 and H2O of a second preset concentration in the first mixed gas are collected at the second end 212 and flow out of the thermal diffusion tube 21 through the fourth gas outlet 215. The first preset concentration is less than the second preset concentration.
[0068] Specifically, when the first mixed gas flows out of the combustion chamber 1, the first mixed gas enters the thermal diffusion tube 21, and under the action of the temperature gradient between the first end 211 and the second end 212, the gas with larger molecular weight in the first mixed gas gathers at the first end 211, and the gas with smaller molecular weight gathers at the second end 212. That is to say, Xe, Kr and H2O of the first preset concentration in the first mixed gas gather at the first end 211, and CO2, O2 and H2O of the second preset concentration in the first mixed gas gather at the second end 212, thereby achieving the technical effect of separating CO2 and O2 from the first mixed gas to obtain the second mixed gas.
[0069] In some specific embodiments, the first preset concentration may be 2 ppm, and the second preset concentration may be 10 ppm.
[0070] It should be noted that the thermal diffusion tube 21 cannot completely remove H2O in the second mixed gas. When the first mixed gas is stored in the thermal diffusion tube 21 and the thermal diffusion tube 21 separates CO2 and O2 in the first mixed gas, the combustion chamber 1 stops supplying the first mixed gas to the thermal diffusion tube 21.
[0071] Furthermore, both the first end 211 and the second end 212 may be provided with a fan. The fan located at the first end 211 is used to blow the second mixed gas into the cooling tower 3, and the fan located at the second end 212 is used to blow the CO2, O2 and the second preset concentration of H2O in the first mixed gas away from the thermal diffusion tube 21 through the fourth air outlet 215.
[0072] Furthermore, the fourth gas outlet 215 may be connected to a CO2 collection device, and the CO2 collection device is used to collect CO2.
[0073] Reference Figure 1 and Figure 3 In some embodiments of the present application, the filtering device 2 may further include a fourth control valve 22 , there are multiple heat diffusion tubes 21 , the multiple heat diffusion tubes 21 are spaced apart, and the fourth control valve 22 is connected between the multiple heat diffusion tubes 21 and the combustion chamber 1 .
[0074] Specifically, the fourth control valve 22 has a second feed port and multiple second discharge ports. The second feed port of the fourth control valve 22 is connected to the combustion chamber 1. The multiple second discharge ports are arranged one-to-one with the multiple thermal diffusion tubes 21. The third air inlet 213 of each thermal diffusion tube 21 is connected to the corresponding second discharge port.
[0075] The fourth control valve 22 is used to control the flow direction of the first mixed gas so that the first mixed gas flows into the thermal diffusion tube 21 where the first mixed gas is not stored.
[0076] Specifically, when the first mixed gas is stored in the thermal diffusion tube 21, the thermal diffusion tube 21 separates CO2 and O2 in the first mixed gas, and during the process of the thermal diffusion tube 21 separating CO2 and O2 in the first mixed gas, the combustion chamber 1 stops supplying the first mixed gas to the thermal diffusion tube 21 storing the first mixed gas. By setting a plurality of thermal diffusion tubes 21 and the fourth control valve 22, the fourth control valve 22 controls the first mixed gas to flow into the thermal diffusion tube 21 where the first mixed gas is not stored, thereby achieving the technical effect of the gas dehydration system 100 continuously separating CO2 and O2 in the first mixed gas, thereby improving the working efficiency of the gas dehydration system 100.
[0077] In some specific embodiments, the fourth control valve 22 may be a directional control valve or the like.
[0078] It should be noted that after the thermal diffusion tube 21 has separated the first mixed gas, and the second mixed gas and CO 2 , O 2 and H 2 O at the second end 212 have flowed out of the thermal diffusion tube 21 , the first mixed gas is not stored in the thermal diffusion tube 21 .
[0079] Reference Figure 3In some embodiments of the present application, a one-way membrane 216 is provided between the first end 211 and the second end 212, and the one-way membrane 216 is used to prevent CO2 and O2 located at the second end 212 from flowing to the first end 211. Specifically, by providing a one-way membrane 216 between the first end 211 and the second end 212, the one-way membrane 216 is used to prevent O2 and CO2 located at the second end 212 from flowing to the first end 211, thereby preventing O2 and CO2 from mixing into the second mixed gas, reducing the time for the thermal diffusion tube 21 to separate the first mixed gas, and further improving the working efficiency of the gas dehydration system 100.
[0080] In some specific embodiments, the unidirectional membrane 216 may be a hatched polymer membrane, but the present application is not limited thereto. The unidirectional membrane 216 may also be a metal organic framework membrane or the like.
[0081] Furthermore, the cooling tower 3 may be provided with three cooling parts, and the temperatures of the three cooling parts are different. When the second mixed gas is mixed with CO2 and O2, the cooling tower 3 separates CO2 and O2 in the second mixed gas through the three cooling parts.
[0082] Specifically, the three cooling parts are the first cooling part, the second cooling part and the third cooling part. When the second mixed gas mixed with CO2 and O2 enters the cooling tower 3, the second mixed gas mixed with CO2 and O2 flows into the first cooling part. The temperature of the first cooling part is between -80°C and -100°C. CO2 condenses into liquid in the first cooling part, and Xe, Kr and O2 are all gaseous. Liquid CO2 flows out of the first cooling part and enters the CO2 collection device. Gaseous Xe, Kr and O2 flow out of the first cooling part and flow into the second cooling part.
[0083] The temperature of the second cooling part is between -110°C and -140°C. In the second cooling part, Xe condenses into liquid, Kr and O2 are both gaseous, liquid Xe flows out of the second cooling part and flows into the cooling tank 41, and gaseous Kr and O2 flow out of the second cooling part and flow into the third cooling part.
[0084] The temperature of the third cooling part is between -155°C and -170°C. In the third cooling part, Kr is condensed into liquid and O2 is gaseous. Liquid Kr flows out of the third cooling part and enters the Kr collection device, and O2 flows out of the third cooling part and enters the O2 collection device. Such an arrangement can achieve the technical effect of gradually separating CO2, O2, Xe and Kr.
[0085] Reference Figure 1In some embodiments of the present application, the filtering device 2 may further include a second adsorption component 23, which is connected between the thermal diffusion tube 21 and the combustion chamber 1. The second adsorption component 23 includes a second molecular sieve 231, a third molecular sieve 232 and a fourth molecular sieve 233. The first mixed gas passes through the second molecular sieve 231, the third molecular sieve 232 and the fourth molecular sieve 233 in sequence and flows into the thermal diffusion tube 21. The second molecular sieve 231 is used to adsorb H2O in the first mixed gas, the third molecular sieve 232 is used to adsorb O2 in the first mixed gas, and the fourth molecular sieve 233 is used to adsorb CO2 in the first mixed gas.
[0086] By arranging a second molecular sieve 231 and a third molecular sieve 232 between the combustion chamber 1 and the thermal diffusion tube 21, the second molecular sieve 231 adsorbs H2O in the first mixed gas, the third molecular sieve 232 adsorbs O2 in the first mixed gas, and the fourth molecular sieve 233 adsorbs CO2 in the first mixed gas, thereby reducing the content of H2O, O2 and CO2 in the first mixed gas, thereby reducing the time for the thermal diffusion tube 21 to separate CO2 and O2 in the first mixed gas, and improving the working efficiency of the gas dehydration system 100.
[0087] In some specific embodiments, the second molecular sieve 231 can be a 3A molecular sieve, the third molecular sieve 232 can be a 5A molecular sieve, and the fourth molecular sieve 233 can be a 13X molecular sieve, but the present application is not limited thereto. The second molecular sieve 231 can also be a 4A molecular sieve, the third molecular sieve 232 can also be activated alumina, and the fourth molecular sieve 233 can also be activated carbon, etc.
[0088] Based on this, the present application further discloses a gas dehydration process, which is applicable to the gas dehydration system of the above embodiment. Figure 4 As shown, according to an embodiment of the present application, the gas dehydration system includes the following steps: S1. Combusting raw gas to obtain a first mixed gas, filtering the first mixed gas to obtain a second mixed gas, the second mixed gas including Xe, Kr and H2O. Specifically, the raw gas is combusted in a combustion chamber, and the hydrocarbon gas in the raw gas is fully burned in the combustion chamber to be converted into CO2 and H2O to obtain a first mixed gas, the first mixed gas including Xe, Kr, CO2, O2 and H2O, and then CO2 and O2 in the first mixed gas are separated by a thermal diffusion tube, Xe, Kr and H2O of a first preset concentration in the first mixed gas are collected at a first end to obtain a second mixed gas, the second mixed gas flows into a cooling tower through a third gas outlet, CO2, O2 and H2O of a second preset concentration in the first mixed gas are collected at a second end and flow out of the thermal diffusion tube through a fourth gas outlet.
[0089] Furthermore, by adsorbing H2O in the first mixed gas through the second molecular sieve, adsorbing O2 in the first mixed gas through the third molecular sieve, and adsorbing CO2 in the first mixed gas through the fourth molecular sieve, the contents of CO2, O2 and H2O in the first mixed gas can be reduced, thereby reducing the time for the thermal diffusion tube to separate CO2 and O2 in the first mixed gas, and improving the working efficiency of the gas dehydration system.
[0090] S2. Cool and separate Kr in the second mixed gas to obtain a liquid mixed gas, wherein the liquid mixed gas includes Xe and H2O. Specifically, the cooling tower cools the second mixed gas, wherein the Xe in the second mixed gas is converted into a liquid state, the H2O in the second mixed gas is converted into a solid state, and the Kr in the second mixed gas is maintained in a gaseous state. The Xe and H2O in the second mixed gas are collected at the bottom of the cooling tower to obtain a liquid mixed gas, and the liquid mixed gas flows into the cooling tank through the second gas outlet, and the Kr in the second mixed gas flows out of the cooling tower through the first gas outlet.
[0091] In some specific embodiments, the temperature of the cooling tower may be -120°C, but the present application is not limited thereto, and the temperature of the cooling tower may also be -140°C, etc.
[0092] S3. Condensing the liquid mixed gas and adsorbing H2O in the liquid mixed gas. Specifically, the cooling tank condenses the liquid mixed gas, and the H2O in the liquid mixed gas is further condensed into solid H2O. The liquid mixed gas after condensation flows into the first adsorption component, and the first adsorption component adsorbs the solid H2O in the liquid mixed gas to reduce the water content in the liquid mixed gas to less than 0.1 ppm.
[0093] S4. Fill the liquid mixed gas into the gas cylinder. Specifically, the liquid mixed gas flowing out of the first adsorption component flows into the first filling device, and the first filling device fills the liquid mixed gas into the gas cylinder.
[0094] The Kr in the second mixed gas is separated by cooling in a cooling tower, and the H2O in the second mixed gas is cooled to a solid state to obtain a liquid mixed gas, the cooling tank further condenses the H2O in the liquid mixed gas, and the first adsorption component adsorbs the H2O in the liquid mixed gas. Compared with the prior art, the present application can reduce the water content of the rare gas to below 0.1ppm, so that the water content of the rare gas can meet the rare gas water content requirements of the aerospace industry.
[0095] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.
Claims
1. A gas dehydration system, characterized in that: include: A combustion chamber (1) and a filter device (2), wherein the filter device (2) is connected to the combustion chamber (1), a raw gas flows into the combustion chamber (1), the combustion chamber (1) is used to burn the raw gas to obtain a first mixed gas, and the filter device (2) is used to filter the first mixed gas to obtain a second mixed gas, wherein the second mixed gas includes Xe, Kr and H2O; A cooling tower (3), the cooling tower (3) having a first air inlet (31), a first air outlet (32) and a second air outlet (33), the filtering device (2) being in communication with the first air inlet (31), the cooling tower (3) being used for separating Kr from the second mixed gas to obtain a liquid mixed gas, the Kr flowing out of the cooling tower (3) through the first air outlet (32), the liquid mixed gas flowing out of the cooling tower (3) through the second air outlet (33), the liquid mixed gas comprising Xe and H2O; A dehydration device (4), the dehydration device (4) comprising a cooling tank (41) and a first adsorption component (42), the cooling tank (41) being connected between the second gas outlet (33) and the first adsorption component (42), the cooling tank (41) being provided with a cooling medium having a temperature lower than a preset temperature, the cooling tank (41) being used for condensing H2O in the liquid mixed gas, and the first adsorption component (42) being used for adsorbing H2O in the liquid mixed gas; A first filling device (5), the first filling device (5) is connected to the first adsorption component (42), and the first filling device (5) is used to fill the liquid mixed gas into the gas cylinder.
2. A gas dehydration system according to claim 1, characterized in that: The dehydration device (4) further comprises: a first control valve (43), a water content detection element (44) and a controller, wherein the first control valve (43) is connected between the first filling device (5) and the first adsorption component (42), the cooling tank (41) has a second air inlet (411), the second air inlet (411) is connected to the second air outlet (33), the first control valve (43) comprises a first input end (431), a first output end (432) and a second output end (433), the first input end (431) is connected to the first adsorption component (42), the first output end (432) is connected to the first filling device (5), the second output end (433) is connected to the first adsorption component (42), The first control valve (43) is used to connect or block the first input end (431) and the first output end (432), and to connect or block the first input end (431) and the second output end (433); the water content detection element (44) is connected between the first input end (431) and the first adsorption component (42); the water content detection element (44) is used to detect the water content of the liquid mixed gas; the controller is communicatively connected to the first control valve (43) and the water content detection element (44); the controller is used to control the working state of the first control valve (43) according to the detection signal of the water content detection element (44).
3. A gas dehydration system according to claim 2, characterized in that: The dehydration device (4) further comprises: a second control valve (45), the second control valve (45) being connected between the second air inlet (411) and the second air outlet (33), the second control valve (45) comprising a second input end (451), a third input end (452) and a third output end (453), the second input end (451) being in communication with the second air outlet (33), the third input end (452) being in communication with the second output end (433), and the third output end (453) being in communication with the second air inlet (411), the second control valve (45) being used for connecting or blocking the second input end (451) and the third output end (453), and connecting or blocking the third input end (452) and the third output end (453), the second control valve (45) being in communication with the controller, and the controller being used for controlling the working state of the second control valve (45) according to the working state of the first control valve (43).
4. A gas dehydration system according to claim 1, characterized in that: The dehydration device (4) further comprises: a third control valve (46); the first adsorption component (42) comprises a plurality of first molecular sieves (421); the plurality of first molecular sieves (421) are arranged at intervals; the plurality of first molecular sieves (421) are all connected to the first filling device (5); the third control valve (46) is connected between the first adsorption component (42) and the cooling tank (41); the third control valve (46) is used to control the liquid mixed gas output from the cooling tank (41) to flow into the first molecular sieve (421) in an unsaturated state; the first molecular sieve (421) is used to adsorb H2O in the liquid mixed gas.
5. A gas dehydration system according to claim 1, characterized in that: The filtering device (2) comprises a heat diffusion tube (21), the heat diffusion tube (21) having a first end (211) and a second end (212) opposite to each other, the first end (211) being provided with a third air inlet (213) and a third air outlet (214), the second end (212) being provided with a fourth air outlet (215), the third air inlet (213) being in communication with the combustion chamber (1), the third air outlet (214) being in communication with the first air inlet (31), the temperature of the first end (211) being higher than the temperature of the second end (212), and the first mixing chamber (215) being provided with a third air inlet (213) and a third air outlet (214). The mixed gas comprises Xe, Kr, CO2, H2O and O2, the Xe, Kr and H2O of a first preset concentration in the first mixed gas are collected at the first end (211) to obtain the second mixed gas, the second mixed gas flows into the cooling tower (3) through the third gas outlet (214), the CO2, O2 and H2O of a second preset concentration in the first mixed gas are collected at the second end (212) and flow out of the thermal diffusion tube (21) through the fourth gas outlet (215), and the first preset concentration is less than the second preset concentration.
6. A gas dehydration system according to claim 5, characterized in that: The filtering device (2) further comprises a fourth control valve (22); the plurality of thermal diffusion tubes (21) are arranged at intervals; the fourth control valve (22) is connected between the plurality of thermal diffusion tubes (21) and the combustion chamber (1); the fourth control valve (22) is used to control the flow direction of the first mixed gas so that the first mixed gas flows into the thermal diffusion tube (21) that does not store the first mixed gas.
7. A gas dehydration system according to claim 5, characterized in that: A one-way membrane (216) is provided between the first end (211) and the second end (212), and the one-way membrane (216) is used to prevent CO2 and O2 located at the second end (212) from flowing to the first end (211).
8. A gas dehydration system according to claim 5, characterized in that: The filtering device (2) further comprises a second adsorption component (23), the second adsorption component (23) being connected between the thermal diffusion tube (21) and the combustion chamber (1), the second adsorption component (23) comprising a second molecular sieve (231), a third molecular sieve (232) and a fourth molecular sieve (233), the first mixed gas sequentially passes through the second molecular sieve (231), the third molecular sieve (232) and the fourth molecular sieve (233) and flows into the thermal diffusion tube (21), the second molecular sieve (231) is used for adsorbing H2O in the first mixed gas, the third molecular sieve (232) is used for adsorbing O2 in the first mixed gas, and the fourth molecular sieve (233) is used for adsorbing CO2 in the first mixed gas.
9. A gas dehydration process, the gas dehydration process being applicable to a gas dehydration system according to any one of claims 1 to 8, characterized in that: include: Burning raw gas to obtain a first mixed gas, filtering the first mixed gas to obtain a second mixed gas, wherein the second mixed gas includes Xe, Kr and H2O; Cooling and separating Kr in the second mixed gas to obtain a liquid mixed gas, wherein the liquid mixed gas includes Xe and H2O; Condensing the liquid mixed gas and adsorbing H2O in the liquid mixed gas; The liquid mixed gas is filled into a gas cylinder.