A pressure swing adsorption device for producing high-purity oxygen

Abstract

The present invention discloses a pressure swing adsorption device for producing high-purity oxygen, which relates to the technical field of oxygen preparation, and comprises an adsorption tank, wherein the adsorption tank is separated into a first adsorption chamber and a second adsorption chamber by a separation net, wherein the first adsorption chamber and the second adsorption chamber are both filled with an adsorbent, and further comprises: a final filter assembly, which comprises an isolation disk, a first airway, and a second airway, wherein the isolation disk is slidably connected in the adsorption tank, wherein the first airway and the second airway are both opened on the isolation disk, and the second airway only allows oxygen to pass through; a sealing member, which is rotatably connected to the isolation disk, and the sealing member has a first position and a second position. In the first position, after the present invention utilizes the adsorbent to adsorb impurities, the final filter assembly immediately intercepts the oxygen, further reduces impurities, improves the oxygen purity, and helps to improve the efficiency. In a low-pressure state, the final filter assembly stops filtering to allow the impurities to pass through smoothly, thereby improving the efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of oxygen preparation, and in particular to a pressure swing adsorption device for producing high-purity oxygen. Background Art

[0002] Oxygen pressure swing adsorption is a gas separation technology. It mainly uses the difference in the adsorption capacity of adsorbents for different gas components when the pressure changes to achieve the process of separating oxygen from the air. The basic principle is that under higher pressure, the adsorbent selectively adsorbs impurity gases such as nitrogen and carbon dioxide in the air, while the adsorption of oxygen on the adsorbent is relatively weak, thereby enriching oxygen and obtaining high-purity oxygen products. The specific principle is: when air enters the adsorption tower, under the action of pressure, gas molecules diffuse to the surface of the adsorbent. For impurity gases such as nitrogen, they will be adsorbed by the active sites on the surface of the adsorbent. This is because there is a van der Waals force between nitrogen molecules and the adsorbent, and in some adsorbents, such as zeolite molecular sieves, nitrogen molecules can also interact with cations inside the molecular sieve. However, due to its slightly different molecular structure and physicochemical properties from nitrogen, the degree of its adsorption at the same pressure is relatively weak, so it can pass through the adsorption layer or be only partially adsorbed.

[0003] At present, impurities in the air are adsorbed by adsorbents, and oxygen can pass through smoothly, but it is inevitable that some impurities will pass through with the oxygen. Therefore, in order to improve the purity of oxygen, a multi-stage separation tank will be set up to adsorb the impurities in the gas multiple times to obtain oxygen with higher purity. This will inevitably affect the oxygen production efficiency and significantly increase the cost of oxygen purification. Summary of the invention

[0004] The object of the present invention is to provide a pressure swing adsorption device for producing high purity oxygen to solve the above-mentioned deficiencies in the prior art.

[0005] In order to achieve the above object, the present invention provides the following technical solution: A pressure swing adsorption device for high-purity oxygen production, comprising an adsorption tank, wherein the adsorption tank is separated into a first adsorption chamber and a second adsorption chamber by a separation net, wherein the first adsorption chamber and the second adsorption chamber are both filled with an adsorbent, and further comprising:

[0006] The final filter assembly includes an isolation disk, a first air passage, and a second air passage. The isolation disk is slidably connected in the adsorption tank. The first air passage and the second air passage are both opened on the isolation disk. The second air passage only allows oxygen to pass through.

[0007] A sealing member rotatably connected to the isolation disk, wherein the sealing member has a first position and a second position. In the first position, the sealing member blocks the second air passage, and in the second position, the sealing member blocks the first air passage;

[0008] The linkage structure passively adjusts the position of the seal according to the change of the air pressure in the adsorption tank.

[0009] Preferably, it also includes a positioning ring, which is fixedly mounted on the inner wall of the adsorption tank, and a guide rod is fixedly mounted on the positioning ring, and the lower part of the guide rod is slidably connected to the isolation disk.

[0010] Preferably, an elastic member is included, and the elastic member applies a downward thrust to the isolation disk.

[0011] Preferably, the linkage structure includes a travel rack, a fixed block, a transmission shaft, a first spur gear, a second bevel gear, and a third bevel gear. The fixed block is fixedly mounted on the isolation disk, the transmission shaft is rotatably connected to the fixed block, the first spur gear and the second bevel gear are respectively fixedly mounted on both ends of the transmission shaft, the travel rack is fixedly mounted on the inner wall of the adsorption tank, and the third bevel gear is fixedly mounted on the seal.

[0012] Preferably, the travel rack is arranged on the moving path of the first spur gear in the vertical direction, and the second bevel gear is meshed with the third bevel gear.

[0013] Preferably, an exhaust pipe is provided at the upper portion of the adsorption tank, and the gas filtered by the final filter assembly is discharged through the exhaust pipe.

[0014] Preferably, an air intake assembly is provided at the lower portion of the adsorption tank, and the gas enters the adsorption tank through the air intake assembly.

[0015] Preferably, the air intake assembly includes a bushing, an air intake pipe and an anti-backflow structure, the bushing is fixedly installed at the lower part of the adsorption tank, the air intake pipe is fixedly installed in the bushing, the anti-backflow structure is arranged at the end of the air intake pipe, and the anti-backflow structure is used to prevent the adsorbent from entering the air intake pipe.

[0016] Preferably, the base is fixedly installed in the air intake pipe, the support rod is fixedly installed on the base, the plug is fixedly installed on the upper end of the support rod, and the sliding sleeve is slidably sleeved on the outside of the plug.

[0017] Preferably, the lower portion of the sliding sleeve is inserted into the bushing, and a gap of not less than 10 mm is provided between the bushing and the sliding sleeve.

[0018] In the above technical scheme, the present invention provides a pressure swing adsorption device for high-purity oxygen production. During the high-pressure adsorption process, after the adsorbent is used to adsorb the impurities, the final filter component immediately intercepts the oxygen for secondary filtration to further reduce the impurities, improve the oxygen purity, and help improve the efficiency. In the low-pressure state, the final filter component stops filtering to allow the impurities to pass smoothly, reduce the oxygen production cycle, and improve efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0020] Figure 1 It is an overall schematic diagram of a pressure swing adsorption device for producing high-purity oxygen according to the present invention;

[0021] Figure 2 A cross-sectional view of an adsorption tank of a pressure swing adsorption device for producing high-purity oxygen according to the present invention;

[0022] Figure 3 This is a schematic diagram of the structure of a final filter assembly of a pressure swing adsorption device for high-purity oxygen production according to the present invention;

[0023] Figure 4 This is a schematic diagram of the structure of an isolation disk of a pressure swing adsorption device for high-purity oxygen production according to the present invention;

[0024] Figure 5 The invention provides an accessory of a pressure swing adsorption device for producing high purity oxygen Figure 2 The schematic diagram of the structure after the enlargement of A in the middle;

[0025] Figure 6 It is a schematic diagram of a backflow prevention structure of a pressure swing adsorption device for high-purity oxygen production in a high-pressure oxygenation state according to the present invention;

[0026] Figure 7 The present invention is a schematic structural diagram of a pressure swing adsorption device for high-purity oxygen production when a sealing component blocks a first airway in a high-pressure oxygen production state.

[0027] Explanation of the accompanying drawings: 1. adsorption tank; 101. first adsorption chamber; 102. second adsorption chamber; 2. separation net; 3. final filter assembly; 31. isolation plate; 32. first air duct; 33. second air duct; 34. sealing member; 35. positioning ring; 36. guide rod; 37. elastic member; 4. linkage structure; 41. travel rack; 42. fixing block; 43. transmission shaft; 44. first spur gear; 45. second bevel gear; 46. third bevel gear; 5. air intake assembly; 51. bushing; 52. air intake pipe; 53. base; 54. support rod; 55. plug; 56. sliding sleeve; 6. exhaust pipe. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0029] See also Figure 1-7 , a pressure swing adsorption device for high-purity oxygen production provided by an embodiment of the present invention comprises an adsorption tank 1, wherein the adsorption tank 1 is separated into a first adsorption chamber 101 and a second adsorption chamber 102 by a separation net 2, and the space in the adsorption tank 1 can be separated into the first adsorption chamber 101 and the second adsorption chamber 102 by the separation net 2, and the first adsorption chamber 101 and the second adsorption chamber 102 are both filled with an adsorbent, and the adsorbent can adsorb impurities other than oxygen in a high-pressure state, so that when the gas is injected, it is in a high-pressure state, and the adsorbent selectively adsorbs impurity gases such as nitrogen and carbon dioxide in the air. At this time, the impurities in the injected gas will be adsorbed by the adsorbent, and the oxygen molecules can pass through the adsorbent smoothly, so that the separation of oxygen and impurities can be completed (the common adsorbent is a 13X molecular sieve), and the 13X molecular sieve filled in the first adsorption chamber 101 and the second adsorption chamber 102 is spherical in shape, and further comprises:

[0030] The final filter assembly 3 includes an isolation disk 31, a first air passage 32, and a second air passage 33. The isolation disk 31 is slidably connected in the adsorption tank 1. The first air passage 32 and the second air passage 33 are both opened on the isolation disk 31. The second air passage 33 only allows oxygen to pass through.

[0031] The isolation disk 31 blocks the second adsorption chamber 102, and the oxygen passing through the second adsorption chamber 102 is intercepted by the isolation disk 31. The second air channel 33 is provided with a strip of ‌13X molecular sieve. Therefore, the second air channel 33 only allows oxygen to pass through, and impurities cannot pass through the second air channel 33 smoothly. Since the adsorbents in the first adsorption chamber 101 and the second adsorption chamber 102 are spherical, there is inevitably a certain gap between the adsorbents. Therefore, the oxygen passing through the first adsorption chamber 101 and the second adsorption chamber 102 will still contain a part of impurities that are not adsorbed. By setting the second air channel 33, all oxygen must pass through to achieve the final fine filtration of oxygen. In this way, the purity of oxygen is greatly improved, the number of oxygen adsorption times is reduced, and it is helpful to improve production efficiency.

[0032] A sealing member 34 rotatably connected to the isolation disk 31 , wherein the sealing member 34 has a first position and a second position. In the first position, the sealing member 34 blocks the second air passage 33 , and in the second position, the sealing member 34 blocks the first air passage 32 ;

[0033] The sealing member 34 can only block the first gas passage 32 or the second gas passage 33 at the same time to achieve the flow of gas under corresponding conditions;

[0034] The linkage structure 4 passively adjusts the position of the sealing member 34 according to the change of the air pressure in the adsorption tank 1 .

[0035] The linkage structure 4 can adjust the position of the seal 34 in real time according to the change of air pressure. When the pressure is low, the pressure in the adsorption tank 1 is small and is not enough to squeeze the isolation disk 31 to move upward. Figure 3As shown, the seal 34 is in the second position, at which time the seal 34 seals the second air channel 33. As the air pressure increases, due to the isolation effect of the isolation disk 31, the pressure in the corresponding cavities above and below the isolation disk 31 changes, the pressure below the isolation disk 31 is large, and the pressure above the isolation disk 31 is small. Therefore, the isolation disk 31 will be displaced. When the isolation disk 31 moves upward, the seal 34 will rotate under the drive of the linkage structure 4, so that the seal 34 will be separated from the second air channel 33, and the seal 34 will block the first air channel 32. At this time, the air flow can only flow from the second air channel 33, and the second air channel 33 is filled with strips of ‌13X molecular sieve. The oxygen is further purified when passing through the second air channel 33, thereby improving the purification efficiency, while in the adsorbent After adsorption is saturated, it is necessary to stop the air intake. Inevitably, the air pressure in the adsorption tank 1 will gradually decrease. After the air pressure decreases, the impurities adsorbed by the adsorbent will fall off. At this time, the oxygen has been adsorbed, and the pressure in the adsorption tank 1 is reduced. The pressure on the upper and lower surfaces of the isolation disk 31 is also clean. In this way, the isolation disk 31 will move downward, thereby driving the seal 34 to reset. In this way, at low pressure, the seal 34 is reset to the first position, and the seal 34 divides the second air channel 33. At this time, the first air channel 32 is exposed, and the impurities emitted by the adsorbent can quickly pass through the first air channel 32 without filtering, so as to achieve rapid discharge of impurities. By utilizing the pressure change of the adsorption tank 1 during oxygen production, the start and stop of the final filter component 3 is passively controlled according to the oxygen production process, which greatly improves the oxygen production efficiency.

[0036] The present embodiment also has the beneficial effect that, after the high-pressure oxygen injection is completed, the isolation disk 31 is not immediately reset, and as the pressure drops, a small amount of impurities are released. At this time, there is still oxygen in the second adsorption chamber 102, so the oxygen is still filtered through the second air duct 33, and the impurities are still adsorbed by the second air duct 33, thereby improving the oxygen preparation rate until the pressure is lower than a certain value, the impurities are released in large quantities, and at this time the second air duct 33 is also blocked, and a large amount of impurities quickly leave the adsorption tank 1 through the first air duct 32.

[0037] In the embodiments of the present invention, please refer to Figure 3 and Figure 7 , further comprising a positioning ring 35, the positioning ring 35 being fixedly mounted on the inner wall of the adsorption tank 1, a guide rail 36 being fixedly mounted on the positioning ring 35, the lower part of the guide rail 36 being slidably connected to the isolation disk 31. An elastic member 37 is included, the elastic member 37 exerts a downward thrust on the isolation disk 31.

[0038] The positioning ring 35 is fixed in the adsorption tank 1. The positioning ring 35 can fix the guide rod 36 to ensure that the guide rod 36 is always in a static state. The guide rod 36 and the isolation plate 31 are slidably connected. Due to the limitation of the guide rod 36, the isolation plate 31 can only change its height in the vertical direction. In this way, when a pressure difference occurs between the upper and lower surfaces of the isolation plate 31, it is ensured that the isolation plate 31 can be displaced. When oxygen is injected at high pressure, the pressure below the isolation plate 31 is large, so the isolation plate 31 will overcome the elastic force of the elastic member 37 and displace upward. At low pressure, the pressure provided below the isolation plate 31 is not enough to support the isolation plate 31. The isolation plate 31 will reset downward under the action of its own gravity and the elastic force of the elastic member 37, and synchronously drive the seal 34 to reset during the resetting process to achieve adjustment of the angle of the seal 34.

[0039] In the embodiments of the present invention, please refer to Figure 2 , 3 and Figure 7 The linkage structure 4 includes a travel rack 41, a fixed block 42, a transmission shaft 43, a first spur gear 44, a second bevel gear 45, and a third bevel gear 46. The fixed block 42 is fixedly mounted on the isolation disk 31. When the isolation disk 31 is displaced in the vertical direction, the fixed block 42 will be displaced in the vertical direction synchronously. The transmission shaft 43 is rotatably connected to the fixed block 42. When the fixed block 42 is displaced in the vertical direction, the transmission shaft 43 can be synchronously driven to be displaced in the vertical direction. The first spur gear 44 and the second bevel gear 45 are respectively fixedly mounted on both ends of the transmission shaft 43. The first spur gear 44 and the second bevel gear 45 can move with the transmission shaft 43. Synchronous movement and synchronous rotation, the travel rack 41 is fixedly mounted on the inner wall of the adsorption tank 1, and the third bevel gear 46 is fixedly mounted on the seal 34. When the isolation disk 31 moves upward, the first spur gear 44 will move upward synchronously, and will mesh with the travel rack 41 during the upward movement of the first spur gear 44. Therefore, the first spur gear 44 will rotate. Synchronously, under the transmission action of the transmission shaft 43, the second bevel gear 45 rotates synchronously, and the second bevel gear 45 and the third bevel gear 46 are meshed. Therefore, the third bevel gear 46 rotates, and the third bevel gear 46 will drive the seal 34 to rotate during its rotation, so that the seal 34 switches to the attached Figure 7 In the position shown, the seal 34 blocks the first air passage 32 , and at this time, the second air passage 33 is in a free-flowing state, so as to ensure that oxygen can enter the upper part of the adsorption tank 1 only through the second air passage 33 , so as to be smoothly discharged from the upper part of the adsorption tank 1 .

[0040] In the embodiment of the present invention, the travel rack 41 is arranged on the moving path of the first spur gear 44 in the vertical direction, and the second bevel gear 45 is meshed with the third bevel gear 46. When the first spur gear 44 is displaced in the vertical direction, the first spur gear 44 is necessarily meshed with the travel rack 41, so that the passive rotation of the first spur gear 44 can be achieved, ensuring that the sealing member 34 can be driven to rotate, and the opening and closing of the first air passage 32 and the second air passage 32 can be achieved.

[0041] In the embodiment of the present invention, please refer to 1-2, the upper part of the adsorption tank 1 is provided with an exhaust pipe 6, and the gas filtered by the final filter assembly 3 is discharged through the exhaust pipe 6. In the high pressure state, the exhaust pipe 6 is used to discharge oxygen, and in the low pressure state, impurities are discharged to the outside through the exhaust pipe 6.

[0042] In the embodiments of the present invention, please refer to Figure 1-2 The lower part of the adsorption tank 1 is provided with an air intake assembly 5, and the gas enters the adsorption tank 1 through the air intake assembly 5. The filtered air enters the adsorption tank 1 through the air intake assembly 5.

[0043] In the embodiments of the present invention, please refer to Figure 1 , Figure 2 , Figure 5 , Figure 6 The air intake assembly 5 includes a bushing 51, an air intake pipe 52 and an anti-backflow structure. The bushing 51 is fixedly installed at the lower part of the adsorption tank 1, and the air intake pipe 52 is fixedly installed in the bushing 51. The anti-backflow structure is arranged at the end of the air intake pipe 52. The anti-backflow structure is used to prevent the adsorbent from entering the air intake pipe 52. The base 53 is fixedly installed in the air intake pipe 52, the support rod 54 is fixedly installed on the base 53, the plug 55 is fixedly installed at the upper end of the support rod 54, and the sliding sleeve 56 is slidably connected to the outside of the plug 55. The lower part of the sliding sleeve 56 is inserted into the bushing 51, and a gap of not less than 10 mm is arranged between the bushing 51 and the sliding sleeve 56. When no air is injected, the air intake assembly 5 is as shown in the attached Figure 6 In the state shown in FIG. 1 , as air is injected, the air first enters the air intake pipe 52, and under the action of the air flow, the air flow will flow out from between the sliding sleeve 56 and the air intake pipe 52. At this time, under the thrust of the air flow, the sliding sleeve 56 will have a tendency to move upward. At this time, the air intake assembly 5 is switched to the state shown in FIG. Figure 5As shown, the airflow is discharged outwardly from the gap reserved between the sliding sleeve 56 and the bushing 51 to the first adsorption chamber 101. When the air is inhaled, the air is dispersed in a circular air intake manner, and the air intake is smooth. In addition, due to the setting of the sliding sleeve 56, the filled spherical ‌13X molecular sieve will fit on the sliding sleeve 56, and the density of the spherical ‌13X molecular sieve at the fitting position will be significantly lower than that at other positions. In this way, the setting can further ensure the smoothness of the air intake, avoid the accumulation of a large number of spherical ‌13X molecular sieves and cause the air to pass through the temperature with low efficiency, so that the air intake is smoother, and the air can be quickly dispersed to the first adsorption chamber 101. The air intake assembly 5 also has an anti-backflow function. After the air input is stopped, the sliding sleeve 56 will move downward, and the lower part of the sliding sleeve 56 will abut against the port of the air intake pipe 52, thereby achieving sealing of the port to prevent the backflow of air. In the long-term use process, the ‌13X molecular sieve will age and produce some debris, which can be automatically avoided by the sliding sleeve 56 to prevent these debris from entering the air intake pipe 52. The debris can only enter the gap between the sliding sleeve 56 and the bushing 51. When the air is taken in next time, the debris will be dispersed into the first adsorption chamber 101 by the airflow to prevent the debris from entering the air intake pipe 52 to ensure smooth air intake.

[0044] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A pressure swing adsorption device for producing high-purity oxygen, comprising an adsorption tank (1), wherein the adsorption tank (1) is separated into a first adsorption chamber (101) and a second adsorption chamber (102) by a separation net (2), wherein the first adsorption chamber (101) and the second adsorption chamber (102) are both filled with an adsorbent, and characterized in that: Also includes: A final filter assembly (3), comprising an isolation disk (31), a first air passage (32), and a second air passage (33), wherein the isolation disk (31) is slidably connected in the adsorption tank (1), the first air passage (32) and the second air passage (33) are both opened on the isolation disk (31), and the second air passage (33) only allows oxygen to pass through; a sealing member (34) rotatably connected to the isolation disk (31), the sealing member (34) having a first position and a second position, wherein in the first position the sealing member (34) blocks the second air passage (33), and in the second position the sealing member (34) blocks the first air passage (32); The linkage structure (4) passively adjusts the position of the sealing member (34) according to the change of the air pressure in the adsorption tank (1); comprising an elastic member (37), wherein the elastic member (37) applies a downward thrust to the isolation disk (31); An air intake assembly (5) is arranged at the lower part of the adsorption tank (1), and gas enters the adsorption tank (1) through the air intake assembly (5); the air intake assembly (5) comprises a bushing (51), an air intake pipe (52), and an anti-backflow structure; the bushing (51) is fixedly mounted at the lower part of the adsorption tank (1), the air intake pipe (52) is fixedly mounted in the bushing (51), and the anti-backflow structure is arranged at the end of the air intake pipe (52), and the anti-backflow structure is used to prevent the adsorbent from entering the air intake pipe (52); The anti-backflow structure comprises a base (53), a support rod (54), a plug (55) and a sliding sleeve (56); the base (53) is fixedly mounted in the air intake pipe (52); the support rod (54) is fixedly mounted on the base (53); the plug (55) is fixedly mounted on the upper end of the support rod (54); and the sliding sleeve (56) is slidably sleeved on the outside of the plug (55).

2. A pressure swing adsorption device for producing high-purity oxygen according to claim 1, characterized in that: It also comprises a positioning ring (35), the positioning ring (35) being fixedly mounted on the inner wall of the adsorption tank (1), a guide rail rod (36) being fixedly mounted on the positioning ring (35), and a lower part of the guide rail rod (36) being slidably connected to the isolation disk (31).

3. A pressure swing adsorption device for producing high-purity oxygen according to claim 1, characterized in that: The linkage structure (4) comprises a travel rack (41), a fixed block (42), a transmission shaft (43), a first spur gear (44), a second bevel gear (45), and a third bevel gear (46); the fixed block (42) is fixedly mounted on the isolation disk (31); the transmission shaft (43) is rotatably connected to the fixed block (42); the first spur gear (44) and the second bevel gear (45) are respectively fixedly mounted on two ends of the transmission shaft (43); the travel rack (41) is fixedly mounted on the inner wall of the adsorption tank (1); and the third bevel gear (46) is fixedly mounted on the sealing member (34).

4. A pressure swing adsorption device for producing high-purity oxygen according to claim 3, characterized in that: The travel rack (41) is arranged on a moving path of the first spur gear (44) in a vertical direction, and the second bevel gear (45) is meshed with the third bevel gear (46).

5. A pressure swing adsorption device for producing high-purity oxygen according to claim 1, characterized in that: An exhaust pipe (6) is provided at the top of the adsorption tank (1), and the gas filtered by the final filter assembly (3) is discharged through the exhaust pipe (6).

6. A pressure swing adsorption device for producing high purity oxygen according to claim 1, characterized in that: The lower portion of the sliding sleeve (56) is inserted into the bushing (51), and a gap of not less than 10 millimeters is provided between the bushing (51) and the sliding sleeve (56).

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