Argon gas dehydration purification system

Abstract

The invention discloses an argon gas dehydration and purification system, which relates to the technical field of argon gas dehydration and purification, and includes a drying system, a regeneration system and a drainage system. The drying system includes a gas-water separator, a molecular sieve adsorber a, a low-temperature dryer, a heater, a dew point meter, a compressor and a gas storage tank. The gas-water separator is connected to the molecular sieve adsorber a, the molecular sieve adsorber a is connected to the low-temperature dryer, the low-temperature dryer is connected to the heater, the heater is connected to the dew point meter, the dew point meter is connected to the compressor, the compressor is connected to the gas storage tank, and the regeneration system includes a molecular sieve adsorber b. The argon gas dehydration and purification system improves the argon gas dehydration and purification effect by combining adsorption, cooling, compression and other means, realizes the conversion and use of the molecular sieve adsorber by regeneration, rewarming and other methods, and improves the argon gas dehydration and purification efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of argon gas dehydration and purification, in particular to an argon gas dehydration and purification system. Background Art

[0002] In the application process of nuclear fusion argon, due to its direct contact with water and the problem of radioactive contamination, or other reasons, when the argon gas passes through the water bath, it will carry a lot of water or water vapor. In order to avoid the discharge of contaminated water and the recycling of argon gas, the water in the argon gas must be removed. There are generally three methods for removing water, absorption drying, adsorption, cooling, etc.

[0003] Cooling is an effective method for removing water vapor. When wet gas is cooled below its dew point, the water vapor condenses into liquid water, which can be separated from the gas. Absorption uses hygroscopic materials, such as calcium chloride or silica gel. When these materials come into contact with water vapor, they absorb moisture, thereby reducing the humidity of the air. Absorption is often used in enclosed spaces or environments where low humidity needs to be maintained for a long time, such as laboratories or storage facilities. Adsorption usually involves the use of solid materials with a large number of micropores, such as activated carbon or molecular sieves. These materials have a large surface area and can effectively adsorb and fix water vapor molecules. Over time, the adsorbent material becomes saturated and needs to be regenerated by heating or other methods to release the adsorbed water and restore its dehumidification capacity.

[0004] In the existing argon gas dehydration and purification system, when the two adsorbers are working, usually one of them performs adsorption and drying work, and the other performs regeneration work such as pressure relief, heating, and cooling. However, when the adsorber performing drying gradually becomes saturated, it takes time to restore the molecular sieve adsorber, thereby reducing the efficiency of argon gas dehydration and purification. Summary of the invention

[0005] 1. Technical issues to be resolved In view of the deficiencies in the prior art, the present invention provides an argon gas dehydration and purification system, which solves the problem that when two adsorbers are working, usually one of them performs adsorption and drying work, and the other performs regeneration work of pressure relief, heating, and cooling. However, when the adsorber performing drying gradually becomes saturated, it takes time to restore the molecular sieve adsorber, thereby reducing the efficiency of argon gas dehydration and purification.

[0006] (II) Technical solution To achieve the above objectives, the present invention is implemented through the following technical solutions: an argon gas dehydration and purification system, including a drying system, a regeneration system and a drainage system: The drying system comprises an air-water separator, a molecular sieve adsorber a, a low-temperature dryer, a heater, a dew point meter, a compressor, and an air storage tank. The air-water separator is connected to the molecular sieve adsorber a, the molecular sieve adsorber a is connected to the low-temperature dryer, the low-temperature dryer is connected to the heater, the heater is connected to the dew point meter, the dew point meter is connected to the compressor, and the compressor is connected to the air storage tank; The regeneration system comprises a molecular sieve adsorber b, the input end of the molecular sieve adsorber b is connected to a gas storage tank, and the output end of the molecular sieve adsorber b is connected to a gas-water separator; The drainage system comprises a water collecting tank, one side of which is connected to the gas-water separator, and the other side of which is connected to the low-temperature dryer; A solenoid valve d and a solenoid valve e are arranged between the gas-water separator and the molecular sieve adsorber b, the solenoid valve d is close to one side of the molecular sieve adsorber b, the solenoid valve e is close to one side of the gas-water separator, a solenoid valve g is arranged between the molecular sieve adsorber a and the gas storage tank, and a solenoid valve j is arranged between the molecular sieve adsorber b and the low-temperature dryer.

[0007] Preferably, a solenoid valve a is provided at the input end of the gas-water separator, a solenoid valve b is provided at the output end of the gas-water separator, a solenoid valve c is provided at the input end of the molecular sieve adsorber a, a solenoid valve i is provided between the molecular sieve adsorber a and the low-temperature dryer, a solenoid valve m is provided at the input end of the gas storage tank, and a solenoid valve p is provided at the output end of the gas storage tank.

[0008] Preferably, the input end of the solenoid valve p is provided with a solenoid valve k, and the output end of the solenoid valve k is connected to a pressure reducing valve.

[0009] Preferably, the input end of the molecular sieve adsorber b is provided with a solenoid valve h, the output end of the pressure reducing valve is connected to the solenoid valve h, the output end of the molecular sieve adsorber b is provided with a solenoid valve f, and the output end of the solenoid valve f is connected to the gas-water separator.

[0010] Preferably, a float valve is connected between the gas-water separator and the water collecting tank, a solenoid valve n is connected between the water collecting tank and the low-temperature dryer, a one-way valve is connected between the solenoid valve n and the water collecting tank, and a drain valve is connected to the output end of the water collecting tank.

[0011] Preferably, two ends of the solenoid valve d are respectively connected to one end of the solenoid valve c and one end of the solenoid valve f, and two ends of the solenoid valve e are respectively connected to the other end of the solenoid valve c and the other end of the solenoid valve f.

[0012] Preferably, two ends of the solenoid valve g are respectively connected to one end of the solenoid valve h and one end of the solenoid valve i, and two ends of the solenoid valve j are respectively connected to the other end of the solenoid valve h and the other end of the solenoid valve i.

[0013] Preferably, a pressure sensor and a safety valve are installed on the surface of the gas storage tank.

[0014] Preferably, thermometers are installed inside the molecular sieve adsorber a, the molecular sieve adsorber b and the low-temperature dryer.

[0015] (III) Beneficial effects The present invention provides an argon gas dehydration and purification system, which has the following beneficial effects: The argon gas dehydration and purification system utilizes the opening and closing of different solenoid valves to realize the switching between the drying route and the regeneration route, so that the saturated molecular sieve adsorber can be continuously evaporated and dried, thus shortening the recovery time of the molecular sieve adsorber, improving the efficiency of argon gas dehydration and purification, and being more flexible and varied in use.

[0016] The argon gas dehydration and purification system still works through the double molecular sieve adsorber, and does not need to add multiple molecular sieve adsorbers to achieve the purification efficiency of argon gas. It has a simple structure and saves equipment investment.

[0017] (III) The argon gas dehydration and purification system can remove a large amount of water vapor in the argon gas by using a gas-water separator, thereby reducing the workload of the subsequent molecular sieve adsorber, extending the time for the molecular sieve adsorber to reach saturation, and improving the use effect. The gas-water separator, molecular sieve adsorber and low-temperature dryer are used to dry the water vapor in the argon gas multiple times, thereby improving the dehydration and purification effect of the argon gas.

[0018] (IV) The argon gas dehydration and purification system can prevent the low-temperature dryer from refluxing air when discharging melted water through a one-way valve, thus avoiding air from entering the low-temperature dryer and reducing the purified argon concentration, thereby ensuring the purification quality of the argon gas. In addition, the low-temperature dryer can be automatically de-iced and drained through intelligent temperature management, thus ensuring the use effect of the low-temperature dryer.

[0019] (V) The argon gas dehydration and purification system can monitor the gas pressure in the gas tank in real time through the pressure sensor and the safety valve to ensure the safety of the system, and can adaptively control and adjust the drying system and regeneration system in the system through the set pressure value, thereby realizing intelligent management of the system and improving the overall work efficiency of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the water removal and purification system of the present invention; Figure 2 This is the control logic sequence diagram of the system of the present invention; Figure 3 This is the pressure detection logic sequence diagram of the present invention.

[0021] Note: Figure 1 The midpoint dashed line indicates the argon drying route; Figure 1 The middle dashed line represents the regeneration gas route.

[0022] In the figure: 1. gas-water separator; 2. molecular sieve adsorber a; 3. molecular sieve adsorber b; 4. low-temperature dryer; 5. heater; 6. dew point meter; 7. compressor; 8. gas storage tank; 9. water collecting tank; 10. solenoid valve a; 11. solenoid valve b; 12. solenoid valve c; 13. solenoid valve d; 14. solenoid valve e; 15. solenoid valve f; 16. solenoid valve g; 17. solenoid valve h; 18. solenoid valve i; 19. solenoid valve j; 20. solenoid valve k; 21. solenoid valve p; 22. solenoid valve m; 23. solenoid valve n; 24. pressure reducing valve; 25. float valve; 26. drain valve; 27. one-way valve. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] See also Figure 1-3 The present invention provides a technical solution: an argon gas dehydration and purification system, including a drying system, a regeneration system and a drainage system: The drying system includes an air-water separator 1, a molecular sieve adsorber a2, a low-temperature dryer 4, a heater 5, a dew point meter 6, a compressor 7, and an air storage tank 8. The air-water separator 1 is connected to the molecular sieve adsorber a2, the molecular sieve adsorber a2 is connected to the low-temperature dryer 4, the low-temperature dryer 4 is connected to the heater 5, the heater 5 is connected to the dew point meter 6, the dew point meter 6 is connected to the compressor 7, and the compressor 7 is connected to the air storage tank 8; The regeneration system includes a molecular sieve adsorber b3, the input end of the molecular sieve adsorber b3 is connected to the gas storage tank 8, and the output end of the molecular sieve adsorber b3 is connected to the gas-water separator 1; The drainage system includes a water collecting tank 9, one side of which is connected to the air-water separator 1, and the other side of the air-water separator 1 is connected to the low-temperature dryer 4; Solenoid valve d13 and solenoid valve e14 are arranged between the gas-water separator 1 and the molecular sieve adsorber b3, the solenoid valve d13 is close to one side of the molecular sieve adsorber b3, the solenoid valve e14 is close to one side of the gas-water separator 1, a solenoid valve g16 is arranged between the molecular sieve adsorber a2 and the gas storage tank 8, and a solenoid valve j19 is arranged between the molecular sieve adsorber b3 and the low-temperature dryer 4.

[0025] Among them, a solenoid valve a10 is provided at the input end of the gas-water separator 1, a solenoid valve b11 is provided at the output end of the gas-water separator 1, a solenoid valve c12 is provided at the input end of the molecular sieve adsorber a2, a solenoid valve i18 is provided between the molecular sieve adsorber a2 and the low-temperature dryer 4, a solenoid valve m22 is provided at the input end of the gas storage tank 8, and a solenoid valve p21 is provided at the output end of the gas storage tank 8.

[0026] The input end of the solenoid valve p21 is provided with a solenoid valve k20 , and the output end of the solenoid valve k20 is connected with a pressure reducing valve 24 .

[0027] Among them, the input end of the molecular sieve adsorber b3 is provided with a solenoid valve h17, the output end of the pressure reducing valve 24 is connected to the solenoid valve h17, the output end of the molecular sieve adsorber b3 is provided with a solenoid valve f15, and the output end of the solenoid valve f15 is connected to the gas-water separator 1.

[0028] Among them, a float valve 25 is connected between the gas-water separator 1 and the water collecting tank 9, a solenoid valve n23 is connected between the water collecting tank 9 and the low-temperature dryer 4, a one-way valve 27 is connected between the solenoid valve n23 and the water collecting tank 9, and a drain valve 26 is connected to the output end of the water collecting tank 9.

[0029] The two ends of the solenoid valve d13 are respectively connected to one end of the solenoid valve c12 and one end of the solenoid valve f15, and the two ends of the solenoid valve e14 are respectively connected to the other end of the solenoid valve c12 and the other end of the solenoid valve f15.

[0030] Among them, the two ends of the solenoid valve g16 are respectively connected to one end of the solenoid valve h17 and one end of the solenoid valve i18, and the two ends of the solenoid valve j19 are respectively connected to the other end of the solenoid valve h17 and the other end of the solenoid valve i18.

[0031] Among them, a pressure sensor and a safety valve are installed on the surface of the gas storage tank 8.

[0032] Among them, thermometers are installed inside the molecular sieve adsorber a2, the molecular sieve adsorber b3 and the low-temperature dryer 4.

[0033] When working: See Figure 1The system can be divided into two routes, namely the gas drying route and the regeneration gas route. When drying the argon gas, the argon gas is dehydrated and dried through the gas drying route, and the molecular sieve adsorber 2 is used as a dryer, that is, the argon gas containing water vapor-solenoid valve a10-gas-water separator 1-solenoid valve b11-solenoid valve c12-molecular sieve adsorber a2-solenoid valve i18-low-temperature dryer 4-heater 5-dew point meter 6-compressor 7-solenoid valve m22-gas storage tank 8-solenoid valve p21. First, the argon gas containing a large amount of water vapor enters the gas-water separator 1 through the solenoid valve a10 for rough separation, and the condensed water is automatically collected in the water collecting tank 9 due to the float valve 25, and the drain valve 26 is opened for drainage. The separated argon gas enters the molecular sieve adsorber molecular sieve adsorber a2 through the solenoid valve b11 and the solenoid valve c12, and the molecular sieve adsorber a2 adsorbs the water vapor in the argon gas. The argon gas after secondary drying flows through the solenoid valve i18 and enters the low-temperature dryer 4, where the lowest temperature can reach -105°C to -110°C, cooling, condensing and separating the excess water molecules in the argon gas. Finally, it is restored to normal temperature through the heater 5 and tested by the dew point meter 6 to obtain 1PPM of argon gas, of which the air drying dew point temperature of 1PPM is about -100°C. The system can adjust the temperature of the low-temperature dryer 4 according to the actual required PPM value, making it more flexible to use. The compressor 7 compresses the low-pressure, normal-temperature, 1ppm dry argon gas into the gas storage tank 8 for standby use. The gas storage tank 8 is equipped with a pressure sensor and a safety valve. When the pressure inside the gas storage tank 8 exceeds the set value, the compressor 7 and the solenoid valve a10 and the solenoid valve m22 are turned off. If argon gas needs to be supplied, the solenoid valve p21 is opened; When regenerating gas, the molecular sieve adsorber B3 is used as a regeneration container, that is, gas tank 8-solenoid valve K20-pressure reducing valve 24-solenoid valve H17-molecular sieve adsorber B3-solenoid valve F15-gas-water separator 1. When the pressure in the gas tank 8 exceeds a certain value, the excess high-pressure, room-temperature, dry gas can be used to regenerate the molecular sieve adsorber B3. The molecular sieve adsorber B3 can be heated to 250℃-350℃ to evaporate the water vapor in its molecular sieve, and the evaporated water vapor is brought into the gas-water separator 1 through dry argon gas, and re-enters the gas drying route.

[0034] When the molecular sieve adsorber a2 is used as a dryer and the molecular sieve adsorber b3 is used as a regenerator, the solenoid valves b11, c12, f15, h17, i18, k20 and m22 are in the open state, and the solenoid valves m13, e14, g16 and j19 are in the closed state. If the states of molecular sieve adsorber a2 and molecular sieve adsorber b3 are converted, that is, molecular sieve adsorber a2 is converted into a regenerator and molecular sieve adsorber b3 is converted into a dryer, then solenoid valve b11, solenoid valve d13, solenoid valve e14, solenoid valve g16, solenoid valve j19, solenoid valve k20 and solenoid valve m22 are in an open state, and solenoid valve c12, solenoid valve f15, solenoid valve h17 and solenoid valve i18 are in a closed state. At this time, the drying system and the regeneration system are respectively converted into the regeneration system and the drying system, thereby realizing the conversion between the drying system and the regeneration system, and being able to continuously evaporate and dry the saturated adsorber, shortening the recovery time of the adsorber and improving the water removal and purification efficiency of argon.

[0035] See also Figure 2 , the low-temperature dryer 4 needs to be reheated regularly to remove ice residues on the surface. When the dew point meter 6 detects that the exhaust gas PPM value exceeds 1PPM, or exceeds the set PPM value, all valves are closed and the compressor 7 is shut down. The low-temperature dryer 4 is reheated. When the temperature returns to normal temperature (Tnormal), the solenoid valve n23 is opened to drain the excess water. There is a one-way valve 27 between the solenoid valve n23 and the water collecting tank 9 to prevent air backflow during drainage. The above is during operation, the system will regularly detect, reheat, and drain. When the system is restarted, the solenoid valve n23 will be opened for 2-3s to discharge the water after the ice residues on the surface of the low-temperature dryer 4 melted when the system was shut down, and then the solenoid valve n23 will be closed, and the low-temperature dryer 4 will store cold until the low-temperature dryer 4 stores cold to a value lower than the set low temperature value Tlow.

[0036] See also Figure 3There are pressure sensors and safety valves on the gas tank 8, which are used to detect the internal pressure of the gas tank 8 in real time and ensure the safety of the system. Three pressure values ​​are set in the system, namely P1 (argon gas inlet pressure, low pressure) < P2 (medium pressure) < P3 (high pressure). When the pressure P in the gas tank 8 is < P1, the solenoid valve f15, solenoid valve h17, solenoid valve k20, and solenoid valve p21 are closed, that is, the exhaust and regeneration systems are closed, and only drying and gas storage are performed; when P1 < P < P2, the system can open the solenoid valve p21. When the solenoid valve P21 is not opened, that is, no exhaust is required, the system automatically opens the solenoid valves F15, H17 and K20, that is, the regeneration system, to regenerate the molecular sieve adsorber B3; when P2<P<P3, the system automatically opens the solenoid valves F15, H17 and K20, that is, the regeneration system, and allows the solenoid valve P21 to be opened at the same time for exhaust; when P>P3, the solenoid valve A10 is closed, and the solenoid valves F15, H17 and K20 are automatically opened, that is, the regeneration system, and the solenoid valve P21 is allowed to be opened at the same time, and the drying system is always in working condition.

[0037] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0038] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An argon gas dehydration and purification system, comprising a drying system, a regeneration system and a drainage system, characterized in that: The drying system comprises a gas-water separator (1), a molecular sieve adsorber a (2), a low-temperature dryer (4), a heater (5), a dew point meter (6), a compressor (7), and a gas storage tank (8); the gas-water separator (1) is connected to the molecular sieve adsorber a (2), the molecular sieve adsorber a (2) is connected to the low-temperature dryer (4), the low-temperature dryer (4) is connected to the heater (5), the heater (5) is connected to the dew point meter (6), the dew point meter (6) is connected to the compressor (7), and the compressor (7) is connected to the gas storage tank (8); The regeneration system comprises a molecular sieve adsorber b (3), wherein the input end of the molecular sieve adsorber b (3) is connected to a gas storage tank (8), and the output end of the molecular sieve adsorber b (3) is connected to a gas-water separator (1); The drainage system comprises a water collecting tank (9), one side of the water collecting tank (9) is connected to the air-water separator (1), and the other side of the air-water separator (1) is connected to the low-temperature dryer (4); A solenoid valve d (13) and a solenoid valve e (14) are provided between the gas-water separator (1) and the molecular sieve adsorber b (3), wherein the solenoid valve d (13) is close to one side of the molecular sieve adsorber b (3), and the solenoid valve e (14) is close to one side of the gas-water separator (1). A solenoid valve g (16) is provided between the molecular sieve adsorber a (2) and the gas storage tank (8), and a solenoid valve j (19) is provided between the molecular sieve adsorber b (3) and the low-temperature dryer (4).

2. The argon gas dehydration and purification system according to claim 1, characterized in that: The input end of the gas-water separator (1) is provided with a solenoid valve a (10), the output end of the gas-water separator (1) is provided with a solenoid valve b (11), the input end of the molecular sieve adsorber a (2) is provided with a solenoid valve c (12), a solenoid valve i (18) is provided between the molecular sieve adsorber a (2) and the low-temperature dryer (4), the input end of the gas storage tank (8) is provided with a solenoid valve m (22), and the output end of the gas storage tank (8) is provided with a solenoid valve p (21).

3. The argon gas dehydration and purification system according to claim 2, characterized in that: The input end of the solenoid valve p (21) is provided with a solenoid valve k (20), and the output end of the solenoid valve k (20) is connected to a pressure reducing valve (24).

4. The argon gas dehydration and purification system according to claim 3, characterized in that: The input end of the molecular sieve adsorber b (3) is provided with a solenoid valve h (17), the output end of the pressure reducing valve (24) is connected to the solenoid valve h (17), the output end of the molecular sieve adsorber b (3) is provided with a solenoid valve f (15), and the output end of the solenoid valve f (15) is connected to the gas-water separator (1).

5. The argon gas dehydration and purification system according to claim 1, characterized in that: A float valve (25) is connected between the gas-water separator (1) and the water collecting tank (9), a solenoid valve n (23) is connected between the water collecting tank (9) and the low-temperature dryer (4), a one-way valve (27) is connected between the solenoid valve n (23) and the water collecting tank (9), and a drain valve (26) is connected to the output end of the water collecting tank (9).

6. The argon gas dehydration and purification system according to claim 2, characterized in that: The two ends of the solenoid valve d (13) are respectively connected to one end of the solenoid valve c (12) and one end of the solenoid valve f (15), and the two ends of the solenoid valve e (14) are respectively connected to the other end of the solenoid valve c (12) and the other end of the solenoid valve f (15).

7. The argon gas dehydration and purification system according to claim 4, characterized in that: The two ends of the solenoid valve g (16) are respectively connected to one end of the solenoid valve h (17) and one end of the solenoid valve i (18), and the two ends of the solenoid valve j (19) are respectively connected to the other end of the solenoid valve h (17) and the other end of the solenoid valve i (18).

8. The argon gas dehydration and purification system according to claim 1, characterized in that: A pressure sensor and a safety valve are installed on the surface of the gas storage tank (8).

9. The argon gas dehydration and purification system according to claim 1, characterized in that: The molecular sieve adsorber a (2), the molecular sieve adsorber b (3) and the low-temperature dryer (4) are all equipped with thermometers.

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