Novel combined pressure-equalizing PSA (Pressure Swing Adsorption) oxygen production device

Abstract

The utility model discloses a novel combined pressure-equalizing PSA (Pressure Swing Adsorption) oxygen production device which comprises an air buffer tank, an oxygen buffer tank and a pipeline, and a first adsorption tower and a second adsorption tower are connected between the air buffer tank and the oxygen buffer tank; a first raw material air valve and a second raw material air valve are respectively arranged between the air buffer tank and the first adsorption tower and between the air buffer tank and the second adsorption tower, and a first emptying valve and a second emptying valve are respectively arranged at the exhaust ends of the first adsorption tower and the second adsorption tower; a first lower pressure equalizing valve, a second lower pressure equalizing valve and an upper pressure equalizing valve are mounted between the first adsorption tower and the second adsorption tower. According to the novel combined pressure-equalizing PSA oxygen production device, a combined pressure-equalizing process is adopted, so that the purity of oxygen can be ensured, and the yield of the product oxygen can be improved; according to the step of step-by-step pressure equalizing, upper pressure equalizing and upper pressure equalizing are firstly carried out to improve the oxygen purity, then upper pressure equalizing and lower pressure equalizing are carried out to collect unused oxygen, and the yield of the oxygen is improved.

Description

Technical Field

[0001] This utility model relates to the field of oxygen generation device technology, specifically a novel combined pressure equalization PSA oxygen generation device. Background Technology

[0002] Currently, the mainstream PSA (Pressure Swing Adsorption) oxygen generation processes on the market are divided into two types: The first type is the top-to-bottom pressure equalization process, where when one adsorption tower finishes depressurization and venting, and the other adsorption tower finishes adsorption and oxygen production, the pressure equalization valve is opened, and pressure equalization (pressure equalization between the tops of the adsorption towers) is performed from the high-pressure adsorption tower to the low-pressure adsorption tower; The second type is the bottom-to-top pressure equalization process, where when one adsorption tower finishes depressurization and venting, and the other adsorption tower finishes adsorption and oxygen production, the pressure equalization valve is opened, and pressure equalization (pressure equalization between the top of the high-pressure adsorption tower and the bottom of the low-pressure adsorption tower) is performed from the high-pressure adsorption tower to the low-pressure adsorption tower.

[0003] The advantages of the pressure equalization process are fast pressure equalization speed and high oxygen purity in the product, but the disadvantage is a lower yield.

[0004] The advantage of the pressure equalization process is a higher oxygen yield, while the disadvantages are a slow pressure equalization speed and lower product oxygen purity. Utility Model Content

[0005] To address the shortcomings of existing technologies, this invention provides a novel combined pressure equalization PSA oxygen generator, which solves the aforementioned problems.

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution: A novel combined pressure equalization PSA oxygen generator includes an air buffer tank, an oxygen buffer tank, and pipelines. A first adsorption tower and a second adsorption tower are connected between the air buffer tank and the oxygen buffer tank. A first raw material gas valve and a second raw material gas valve are respectively provided between the air buffer tank and the first and second adsorption towers. A first vent valve and a second vent valve are respectively installed at the exhaust ends of the first and second adsorption towers. A first lower pressure equalization valve, a second lower pressure equalization valve, and an upper pressure equalization valve are installed between the first and second adsorption towers. A first oxygen production valve, a second oxygen production valve, a first one-way valve, a second one-way valve, and a speed control valve are installed between the exhaust ends of the first and second adsorption towers and the oxygen buffer tank.

[0007] Preferably, the air inlet of the air buffer tank is connected to the raw material gas source, and the air outlet of the oxygen buffer tank is connected to the product gas source.

[0008] Preferably, both the first adsorption tower and the second adsorption tower are equipped with molecular sieves.

[0009] Preferably, the first adsorption tower and the second adsorption tower are connected in parallel between the air buffer tank and the oxygen buffer tank.

[0010] Preferably, the inlet ends of the first raw material gas valve and the second raw material gas valve are connected to the air buffer tank, and the outlet ends of the first raw material gas valve and the second raw material gas valve are respectively connected to the first adsorption tower and the second adsorption tower.

[0011] Preferably, the inlet ends of the first oxygen generating valve and the second oxygen generating valve are respectively connected to the outlet ends of the first adsorption tower and the second adsorption tower, and the outlet ends of the first oxygen generating valve and the second oxygen generating valve are connected to the oxygen buffer tank.

[0012] Preferably, the inlet ends of the first vent valve and the second vent valve are connected to the first adsorption tower and the second adsorption tower, respectively, and the outlet ends of the first vent valve and the second vent valve are connected to silencers.

[0013] This invention provides a novel combined pressure equalization PSA oxygen generator. Compared with the prior art, it has the following advantages:

[0014] 1. Compared with any single pressure equalization process, this new combined pressure equalization PSA oxygen generator can ensure the purity of oxygen and improve the yield of product oxygen.

[0015] 2. This novel combined pressure equalization PSA oxygen generator features a step-by-step pressure equalization process. First, it performs upper-to-upper pressure equalization to improve oxygen purity, and then performs lower-to-upper pressure equalization to collect unused oxygen and improve oxygen yield.

[0016] 3. In this novel combined pressure equalization PSA oxygen generator, when the pressure is equalized and increased from top to bottom, the airflow follows the adsorption direction, flushing the gas with lower oxygen purity at the bottom of the adsorption tower to the top for pre-adsorption, thereby maximizing the oxygen yield.

[0017] 4. This new type of combined pressure equalization PSA oxygen generator adopts a combined pressure equalization process. While ensuring oxygen purity, it allows the pressure equalization gas to re-enter the drying and adsorption process, which reduces the upward movement speed of the moisture saturation zone of the molecular sieve and extends the service life of the molecular sieve. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a diagram showing the concentration distribution of components inside the PSA oxygen generation adsorption tower of this invention.

[0020] In the diagram: 1. Air buffer tank; 2. Oxygen buffer tank; 3. Piping; 4. First adsorption tower; 5. Second adsorption tower; 6. First raw material gas valve; 7. Second raw material gas valve; 8. First vent valve; 9. Second vent valve; 10. First lower equalizing valve; 11. Second lower equalizing valve; 12. Upper equalizing valve; 13. First oxygen production valve; 14. Second oxygen production valve; 15. First check valve; 16. Second check valve; 17. Speed ​​control valve; 18. Silencer. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figure 1-2This utility model provides a technical solution: a novel combined pressure equalization PSA oxygen generator, comprising an air buffer tank 1, an oxygen buffer tank 2, and a pipeline 3. The inlet of the air buffer tank 1 is connected to a raw material gas source, and the outlet of the oxygen buffer tank 2 is connected to a product gas source. A first adsorption tower 4 and a second adsorption tower 5 are connected between the air buffer tank 1 and the oxygen buffer tank 2. Both the first adsorption tower 4 and the second adsorption tower 5 are equipped with molecular sieves. The first adsorption tower 4 and the second adsorption tower 5 are connected in parallel between the air buffer tank 1 and the oxygen buffer tank 2, allowing for selective loading of the raw material gas. The air can be introduced into either the first adsorption tower 4 or the second adsorption tower 5. A first raw material gas valve 6 and a second raw material gas valve 7 are respectively provided between the air buffer tank 1 and the first adsorption tower 4 and the second adsorption tower 5. The inlet ends of the first raw material gas valve 6 and the second raw material gas valve 7 are connected to the air buffer tank 1, and the outlet ends of the first raw material gas valve 6 and the second raw material gas valve 7 are respectively connected to the first adsorption tower 4 and the second adsorption tower 5. A first vent valve 8 and a second vent valve 9 are respectively installed at the exhaust ends of the first adsorption tower 4 and the second adsorption tower 5. A first lower equalization device is installed between the first adsorption tower 4 and the second adsorption tower 5. Pressure equalization valve 10, second lower pressure equalization valve 11, and upper pressure equalization valve 12 are installed between the exhaust ends of the first adsorption tower 4 and the second adsorption tower 5 and the oxygen buffer tank 2. A first oxygen generating valve 13, a second oxygen generating valve 14, a first one-way valve 15, a second one-way valve 16, and a speed control valve 17 are also installed. Through the control of the speed control valve 17, the first one-way valve 15, and the second one-way valve 16, free nitrogen can be flushed and discharged with product oxygen, which helps to improve the purity of the product oxygen. The inlet ends of the first oxygen generating valve 13 and the second oxygen generating valve 14 are respectively connected to the outlet ends of the first adsorption tower 4 and the second adsorption tower 5. The outlet ends of the first oxygen generating valve 13 and the second oxygen generating valve 14 are connected to the oxygen buffer tank 2. The inlet ends of the first vent valve 8 and the second vent valve 9 are respectively connected to the first adsorption tower 4 and the second adsorption tower 5. The outlet ends of the first vent valve 8 and the second vent valve 9 are connected to a silencer 18. The silencer 18 can suppress the exhaust noise of the exhaust airflow when the first adsorption tower 4 and the second adsorption tower 5 are vented. Moreover, the above-mentioned raw material gas valve, vent valve, pressure equalization valve and oxygen generating valve are all programmable valves, which are automatically opened or closed by the PLC control system to realize the automatic operation of the system.

[0023] The entire workflow is as follows:

[0024] 1. Adsorption process

[0025] The raw gas enters the first adsorption tower 4 from the bottom of the adsorption tower. After selective adsorption by the adsorbent, oxygen with a purity of 70-90% is directly obtained and discharged from the top of the tower into the oxygen buffer tank 2.

[0026] 2. Upper pressure equalization and pressure reduction process

[0027] After the adsorption step of the first adsorption tower 4 is completed, the upper pressure equalization valve 12 is opened, and the airflow flows from the top of the first adsorption tower 4 to the top of the second adsorption tower 5 to achieve the effect of preliminary pressure equalization.

[0028] 3. Pressure equalization and reduction process

[0029] Close the upper pressure equalization valve 12 and open the second lower pressure equalization valve 11 of the second adsorption tower 5. The airflow flows from the top of the first adsorption tower 4 to the bottom of the second adsorption tower 5, completing the entire pressure equalization process.

[0030] 4. Depressurization and venting process

[0031] After the pressure equalization step is completed, the first vent valve 8 of the first adsorption tower 4 is opened to release the air. As the pressure inside the tower decreases, the adsorption capacity of the molecular sieve decreases, and the adsorbed nitrogen gas is desorbed and released.

[0032] 5. Product air flushing process

[0033] The depressurization process cannot completely remove the nitrogen from the adsorption tower. Some free nitrogen remains in the gaps between the molecular sieves. By controlling the speed control valve 17 and the first check valve 15 and the second check valve 16, the free nitrogen is flushed and discharged with product oxygen, which helps to improve the purity of the product oxygen.

[0034] 6. Upper equalization and pressure increase process

[0035] After the nitrogen adsorbed by the molecular sieve in the first adsorption tower 4 is completely desorbed, the pressure inside the tower is low. When the upper pressure equalization valve 12 is opened, the gas flow flows from the top of the first adsorption tower 4 to the top of the second adsorption tower 5, achieving the effect of preliminary pressure equalization.

[0036] 7. Pressure equalization and boosting process

[0037] Close the upper equalizing valve 12 and open the first lower equalizing valve 10 of the first adsorption tower 4. The airflow flows from the top of the second adsorption tower 5 to the bottom of the first adsorption tower 4, increasing the pressure inside the adsorption tower until it reaches the adsorption pressure.

[0038] After this process, the adsorption tower completes the entire regeneration process and is ready for the next adsorption cycle.

[0039] By alternating between the first adsorption tower 4 and the second adsorption tower 5, a continuous supply of oxygen product can be obtained.

[0040] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

Claims

1. A novel combined pressure swing adsorption (PSA) oxygen generation plant, characterized in that: The application relates to an air buffer tank (1), an oxygen buffer tank (2) and a pipeline (3), wherein the air buffer tank (1) is connected with the oxygen buffer tank (2) through a first adsorption tower (4) and a second adsorption tower (5), the air buffer tank (1) is respectively provided with a first raw gas valve (6) and a second raw gas valve (7) between the first adsorption tower (4) and the second adsorption tower (5), the exhaust end of the first adsorption tower (4) and the second adsorption tower (5) is respectively provided with a first vent valve (8) and a second vent valve (9), the first adsorption tower (4) and the second adsorption tower (5) are provided with a first lower pressure equalizing valve (10), a second lower pressure equalizing valve (11) and an upper pressure equalizing valve (12) between the first adsorption tower (4) and the second adsorption tower (5), and the exhaust end of the first adsorption tower (4) and the second adsorption tower (5) is provided with a first oxygen production valve (13), a second oxygen production valve (14), a first one-way valve (15), a second one-way valve (16) and a speed control valve (17) between the first adsorption tower (4) and the second adsorption tower (5) and the oxygen buffer tank (2).

2. A novel combined pressure swing adsorption (PSA) oxygen generating device according to claim 1, characterized in that: The air inlet end of the air buffer tank (1) is connected with a raw gas source, and the air outlet end of the oxygen buffer tank (2) is connected with a product gas source.

3. A novel combined pressure swing adsorption (PSA) oxygen generating device according to claim 1, characterized in that: Molecular sieves are arranged in the first adsorption tower (4) and the second adsorption tower (5).

4. The novel combined pressure swing adsorption (PSA) oxygen generating device according to claim 1, characterized in that: The first adsorption tower (4) and the second adsorption tower (5) are connected in parallel between the air buffer tank (1) and the oxygen buffer tank (2).

5. The novel combined pressure swing adsorption (PSA) oxygen generating device according to claim 1, characterized in that: The air inlet end of the first raw gas valve (6) and the second raw gas valve (7) is connected with the air buffer tank (1), and the air outlet end of the first raw gas valve (6) and the second raw gas valve (7) is connected with the first adsorption tower (4) and the second adsorption tower (5) respectively.

6. A novel combined pressure swing adsorption (PSA) oxygen generating device as claimed in claim 1, wherein: The air inlet end of the first oxygen production valve (13) and the second oxygen production valve (14) is connected with the air outlet end of the first adsorption tower (4) and the second adsorption tower (5) respectively, and the air outlet end of the first oxygen production valve (13) and the second oxygen production valve (14) is connected with the oxygen buffer tank (2).

7. A novel combined pressure swing adsorption (PSA) oxygen generating device as claimed in claim 1, wherein: The air inlet end of the first vent valve (8) and the second vent valve (9) is connected with the first adsorption tower (4) and the second adsorption tower (5) respectively, and the air outlet end of the first vent valve (8) and the second vent valve (9) is connected with a silencer (18).

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