Oxygen generation system and oxygen generation method

Abstract

The invention relates to an oxygen generation system and an oxygen generation method, the oxygen generation system comprises a first adsorption tower and a second adsorption tower, the first adsorption tower and the second adsorption tower are both used for introducing compressed air and adsorbing oxygen in the compressed air, and the first adsorption tower and the second adsorption tower are communicated through a pressure equalizing valve; the waste gas buffer device is respectively communicated with the first adsorption tower and the second adsorption tower through a first pipeline and a second pipeline and is used for recovering the non-oxygen gas discharged by the first adsorption tower and the second adsorption tower; the extraction buffer device is communicated with the first adsorption tower and the second adsorption tower through a third pipeline and a fourth pipeline respectively and is used for extracting oxygen adsorbed in the first adsorption tower and the second adsorption tower; and a first switch valve, a second switch valve, a third switch valve and a fourth switch valve are respectively arranged on the first pipeline, the second pipeline, the third pipeline and the fourth pipeline. According to the oxygen production system, the oxygen production process can be simplified, high-purity oxygen can be continuously produced, and the oxygen production efficiency is effectively improved.

Description

Technical Field

[0001] The present application relates to the technical field of oxygen production, and in particular to an oxygen production system and an oxygen production method. Background Art

[0002] Pressure swing adsorption unit is a commonly used oxygen production system. It usually includes two main steps: adsorption and desorption. In the adsorption process, compressed air is first sucked into an adsorption tower containing molecular sieves, where nitrogen and other impurities are adsorbed onto the surface of the molecular sieves, while the oxygen-rich airflow flows directly out through the molecular sieves. In the desorption process, by changing conditions such as temperature or pressure, the molecular sieve releases the nitrogen and other impurities that have been adsorbed, thereby restoring its adsorption capacity.

[0003] In the related art, the oxygen production system mainly includes two main steps: producing oxygen-enriched air at the front end and producing high-purity oxygen at the back end. The oxygen production process is complicated and the oxygen production efficiency is low. Summary of the invention

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application provides an oxygen production system and an oxygen production method, wherein the oxygen production system can simplify the process of producing oxygen, can continuously produce high-purity oxygen, and effectively improve the efficiency of producing oxygen.

[0005] In a first aspect, the present application provides an oxygen production system, comprising:

[0006] A first adsorption tower and a second adsorption tower, wherein the first adsorption tower and the second adsorption tower are both used to introduce compressed air and adsorb oxygen in the compressed air, and the first adsorption tower and the second adsorption tower are connected through a pressure equalizing valve;

[0007] an exhaust gas buffer device, connected to the first adsorption tower and the second adsorption tower through a first pipeline and a second pipeline respectively, for recovering the non-oxygen gas discharged from the first adsorption tower and the second adsorption tower;

[0008] an extraction buffer device, connected to the first adsorption tower and the second adsorption tower through a third pipeline and a fourth pipeline respectively, for extracting oxygen adsorbed in the first adsorption tower and the second adsorption tower;

[0009] The first pipeline, the second pipeline, the third pipeline and the fourth pipeline are respectively provided with a first switch valve, a second switch valve, a third switch valve and a fourth switch valve.

[0010] The oxygen production system according to the first aspect of the present application has at least the following beneficial effects:

[0011] The oxygen production system of the present application is arranged in coordination with the first adsorption tower, the second adsorption tower, the waste gas buffer device and the extraction buffer device. During the oxygen production process, when one of the first adsorption tower and the second adsorption tower adsorbs oxygen in the compressed air and guides the non-absorbed non-oxygen gas in the compressed air to the waste gas buffer device, the extraction buffer device simultaneously vacuums and depressurizes the other adsorption tower to synchronously desorb the oxygen adsorbed in the adsorption tower, and then extracts and collects it. At the same time, after each oxygen extraction action of the extraction buffer device, the equalizing valve is opened for a period of time to make the pressure of the first adsorption tower and the second adsorption tower relatively balanced, and also to ensure the system pressure balance, and reduce the risk of damage to various switch valves and other equipment due to pressure changes. In this way, the first adsorption tower and the second adsorption tower alternately implement the action of adsorbing oxygen and the action of desorbing oxygen under the action of the extraction buffer device, so that the extraction buffer device can continuously produce oxygen with higher purity. Compared with the traditional oxygen production system, the oxygen production process is simplified and the oxygen production efficiency is effectively improved.

[0012] In some embodiments, the first pipeline and the second pipeline are both connected to the exhaust gas buffer device through a fifth pipeline, and the first pipeline is connected to the second pipeline, and a fifth switch valve is provided on the fifth pipeline.

[0013] In some embodiments, the outlet of the first adsorption tower and the outlet of the second adsorption tower are connected through a sixth pipeline, and the pressure equalizing valve is disposed on the sixth pipeline.

[0014] In some embodiments, the third pipeline and the fourth pipeline are both connected to the extraction buffer device through a seventh pipeline, the seventh pipeline is connected to a first exhaust branch, and a tenth switch valve is provided on the first exhaust branch.

[0015] In some embodiments, the oxygen production system also includes an air compressor, which is used to compress air into compressed air and transport the compressed air to the first adsorption tower and the second adsorption tower. The air compressor is connected to the first adsorption tower and the second adsorption tower through an eighth pipeline and a ninth pipeline respectively. An eighth switch valve and a ninth switch valve are respectively provided on the eighth pipeline and the ninth pipeline.

[0016] In some embodiments, the eighth pipeline and the ninth pipeline are both connected to the outlet of the air compressor through the tenth pipeline, the tenth pipeline is connected to a second exhaust branch, and the second exhaust branch is provided with an eleventh switch valve.

[0017] In some embodiments, the oxygen production system further includes an air purification device, which is disposed at the inlet of the air compressor and is used to remove dust and dry the air entering the air compressor.

[0018] In some embodiments, the extraction buffer device includes a negative pressure mechanism and an oxygen buffer tank, and the negative pressure mechanism is connected to the oxygen buffer tank.

[0019] In a second aspect, the present application provides an oxygen production method, which is used to operate the oxygen production system described above, and the oxygen production method comprises the following steps:

[0020] Step S1, compressed air is introduced into the first adsorption tower, the first adsorption tower adsorbs and enriches the oxygen in the compressed air, and the remaining non-oxygen gas in the compressed air is introduced into the exhaust gas buffer device. At the same time, the extraction buffer device vacuums and depressurizes the second adsorption tower that has completed the oxygen adsorption, so as to desorb and collect the oxygen adsorbed in the second adsorption tower;

[0021] Step S2, opening the pressure equalizing valve to allow part of the non-oxygen gas remaining in the first adsorption tower to enter the second adsorption tower;

[0022] Step S3, the compressed air is introduced into the second adsorption tower, the second adsorption tower adsorbs and enriches the oxygen in the compressed air, and the remaining non-oxygen gas in the compressed air is introduced into the exhaust gas buffer device. At the same time, the extraction buffer device vacuums and depressurizes the first adsorption tower that has completed the adsorption of oxygen, so as to desorb and collect the oxygen adsorbed in the first adsorption tower;

[0023] Step S4, opening the pressure equalizing valve to allow part of the non-oxygen gas remaining in the second adsorption tower to enter the first adsorption tower;

[0024] Step S5, repeat the above steps S1 to S4.

[0025] In some embodiments, step S1 includes:

[0026] Step 11: Open the first switch valve, close the pressure equalizing valve, and pass the compressed air into the first adsorption tower. The first adsorption tower adsorbs and enriches the oxygen in the compressed air, and the remaining non-oxygen gas in the compressed air is introduced into the exhaust gas buffer device through the first pipeline.

[0027] Step 12, close the fifth switch valve, open the first switch valve and the second switch valve, so that the first pipeline and the second pipeline are connected for a first preset time;

[0028] Step 13, opening the fourth switch valve, closing the first switch valve and the second switch valve, and the extraction buffer device evacuates and depressurizes the second adsorption tower that has completed oxygen adsorption through the fourth pipeline to desorb and collect the oxygen adsorbed in the second adsorption tower;

[0029] And / or, step S3 comprises:

[0030] S31, open the second switch valve, close the pressure equalizing valve, and pass the compressed air into the second adsorption tower, the second adsorption tower adsorbs and enriches the oxygen in the compressed air, and the remaining non-oxygen gas in the compressed air that is not adsorbed is introduced into the exhaust gas buffer device through the second pipeline;

[0031] S32, closing the fifth switch valve, opening the first switch valve and the second switch valve, so that the first pipeline and the second pipeline are connected for a second preset time;

[0032] S33, opening the third switch valve, closing the first switch valve and the second switch valve, and the extraction buffer device evacuates and reduces the pressure of the first adsorption tower that has completed oxygen adsorption through the third pipeline to desorb and collect the oxygen adsorbed in the first adsorption tower.

[0033] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0035] Figure 1 This is a schematic diagram of the structure of the oxygen production system according to an embodiment of the present application.

[0036] Figure 2 Another structural schematic diagram of the oxygen production system according to an embodiment of the present application.

[0037] Description of reference numerals: air compressor 100; first adsorption tower 200; pressure sensor 210; first temperature sensor 220; second adsorption tower 300; second pressure sensor 310; second temperature sensor 320; exhaust gas buffer device 400; equalizing valve 500; extraction buffer device 600; negative pressure mechanism 610; oxygen buffer tank 620; air purification device 700; first pipeline 10; second pipeline 20; third pipeline 30; fourth pipeline 40; fifth pipeline 50; sixth pipeline 60; seventh pipeline 70; eighth pipeline 80; ninth pipeline 90; The first switch valve 11; the second switch valve 21; the third switch valve 31; the fourth switch valve 41; the fifth switch valve 51; the eighth switch valve 81; the ninth switch valve 91; the tenth pipeline 101; the first exhaust branch 102; the first sub-exhaust branch 1021; the second sub-exhaust branch 1022; the tenth switch valve 103; the first automatic valve 1031; the first manual valve 1032; the second exhaust branch 104; the third sub-exhaust branch 1041; the fourth sub-exhaust branch 1042; the eleventh switch valve 105; the second automatic valve 1051; the second manual valve 1052. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0039] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0040] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0041] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0042] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0043] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0044] Pressure swing adsorption unit is a commonly used oxygen production system. It usually includes two main steps: adsorption and desorption. In the adsorption process, compressed air is first sucked into an adsorption tower containing molecular sieves, where nitrogen and other impurities are adsorbed onto the surface of the molecular sieves, while the oxygen-rich airflow flows directly out through the molecular sieves. In the desorption process, by changing conditions such as temperature or pressure, the molecular sieve releases the nitrogen and other impurities that have been adsorbed, thereby restoring its adsorption capacity.

[0045] In the related art, the oxygen production system mainly includes two main steps: producing oxygen-enriched air at the front end and producing high-purity oxygen at the back end. The oxygen production process is complicated and the oxygen production efficiency is low.

[0046] Based on this, in order to address the problems of complicated oxygen production process and low oxygen production efficiency in the existing oxygen production system, one or more embodiments of the present application provide an oxygen production system. Through the coordinated arrangement of a first adsorption tower, a second adsorption tower, an exhaust gas buffer device and an extraction buffer device, during the oxygen production process, when one of the first adsorption tower and the second adsorption tower adsorbs oxygen in the compressed air and guides the non-absorbed non-oxygen gas in the compressed air to the exhaust gas buffer device, the extraction buffer device simultaneously vacuums and reduces the pressure in the other adsorption tower to synchronously desorb the oxygen adsorbed in the adsorption tower, and then extracts and collects it. At the same time, after each oxygen extraction action of the extraction buffer device, the pressure equalizing valve is opened for a period of time to make the pressure of the first adsorption tower and the second adsorption tower relatively balanced, thereby ensuring the pressure balance of the system and reducing the risk of damage to various equipment such as switch valves due to pressure changes.

[0047] In this way, the first adsorption tower and the second adsorption tower alternately adsorb oxygen and desorb oxygen under the action of the extraction buffer device, so that the extraction buffer device can continuously produce oxygen with higher purity. Compared with the traditional oxygen production system, the oxygen production process is simplified and the oxygen production efficiency is effectively improved.

[0048] See also Figure 1 An embodiment of the present application provides an oxygen production system, which includes a first adsorption tower 200, a second adsorption tower 300, an exhaust gas buffer device 400 and an extraction buffer device 600.

[0049] The first adsorption tower 200 and the second adsorption tower 300 are both used for introducing compressed air and adsorbing oxygen in the compressed air. The first adsorption tower 200 and the second adsorption tower 300 are connected via a pressure equalizing valve 500.

[0050] The waste gas buffer device 400 is connected to the first adsorption tower 200 and the second adsorption tower 300 through the first pipeline 10 and the second pipeline 20 respectively. The waste gas buffer device 400 is used to recover the non-oxygen gas discharged from the first adsorption tower 200 and the second adsorption tower 300.

[0051] The extraction buffer device 600 is connected to the first adsorption tower 200 and the second adsorption tower 300 through the third pipeline 30 and the fourth pipeline 40 respectively, and the extraction buffer device 600 is used to extract oxygen adsorbed in the first adsorption tower 200 and the second adsorption tower 300.

[0052] The first pipeline 10 , the second pipeline 20 , the third pipeline 30 and the fourth pipeline 40 are respectively provided with a first switch valve 11 , a second switch valve 21 , a third switch valve 31 and a fourth switch valve 41 .

[0053] It should be noted that, in the oxygen production system of the present application, the first adsorption tower 200 refers to a container device filled with an adsorbent, and the adsorbent filled in the first adsorption tower 200 can be a carbon molecular sieve solid adsorbent. It should be noted that the carbon molecular sieve is a carbon-based adsorbent that can selectively adsorb gas molecules with a diameter smaller than its micropore pore size. The carbon molecular sieve has a uniform microporous structure, and its micropore pore size is larger than the diameter of the oxygen molecule. When the compressed air enters the first adsorption tower 200, since the oxygen in the compressed air has a small diameter and a fast diffusion rate, the oxygen in the compressed air can quickly diffuse into the micropores of the carbon molecular sieve in the first adsorption tower 200 and be adsorbed by the micropores of the carbon molecular sieve. The non-oxygen gas (such as nitrogen, carbon dioxide, water vapor, etc.) in the compressed air is basically not adsorbed by the micropores of the carbon molecular sieve due to the large pore size and slow diffusion rate. The non-oxygen gas in the compressed air is enriched in the gas phase and gathered at the outlet of the first adsorption tower 200.

[0054] It is understandable that the first adsorption tower 200 can separate oxygen from non-oxygen gas in compressed air and adsorb and enrich oxygen. The structure and function of the second adsorption tower 300 are consistent with those of the first adsorption tower 200, and will not be described in detail here.

[0055] In the oxygen production system of the present application, the waste gas buffer device 400 refers to a recovery storage container capable of recovering the non-oxygen gas flowing out of the first adsorption tower 200 and the second adsorption tower 300, and the waste gas buffer device 400 can discharge the recovered non-oxygen gas in a green manner.

[0056] In the oxygen production system of the present application, the extraction buffer device 600 refers to a device capable of extracting the oxygen adsorbed in the first adsorption tower 200 and the second adsorption tower 300, and recycling and storing the extracted oxygen. The extraction buffer device 600 may include a negative pressure mechanism 610 and an oxygen buffer tank 620 that are connected. The negative pressure mechanism 610 is connected to the first adsorption tower 200 and the second adsorption tower 300, respectively, to extract the oxygen adsorbed in the first adsorption tower 200 and the second adsorption tower 300 by vacuuming, and transport the extracted oxygen to the oxygen buffer tank 620, so that the oxygen buffer tank 620 collects and stores the oxygen.

[0057] In the oxygen production system of the present application, the first pipeline 10, the second pipeline 20, the third pipeline 30 and the fourth pipeline 40 can be lightweight pipelines such as plastic pipelines and silicone pipelines.

[0058] In the oxygen production system of the present application, the first switch valve 11, the second switch valve 21, the third switch valve 31 and the fourth switch valve 41 can be electronic valves, pneumatic valves, etc. The oxygen production system can also include a control module (not shown in the figure), which is electrically connected to the first adsorption tower 200, the second adsorption tower 300, the exhaust gas buffer device 400, the extraction buffer device 600, the first switch valve 11, the second switch valve 21, the third switch valve 31 and the fourth switch valve 41, so as to automatically control the operating state of the entire oxygen production system based on on-site needs.

[0059] In addition, in the oxygen production system of the present application, see Figure 1 The first adsorption tower 200 is provided with a first pressure sensor 210 and a first temperature sensor 220, which are used to detect the pressure and temperature in the first adsorption tower 200. Similarly, the second adsorption tower 300 is provided with a second pressure sensor 310 and a second temperature sensor 320, which are used to detect the pressure and temperature in the second adsorption tower 300.

[0060] The first pressure sensor 210, the first temperature sensor 220, the second pressure sensor 310 and the second temperature sensor 320 are all telecommunication-connected to the control module, so that the control module can monitor the operating status of the first adsorption tower 200 and the second adsorption tower 300 in real time according to the detection signals of the first pressure sensor 210, the first temperature sensor 220, the second pressure sensor 310 and the second temperature sensor 320, so as to adjust the operating status of the first adsorption tower 200 and the second adsorption tower 300 in real time to ensure the operating reliability of the first adsorption tower 200 and the second adsorption tower 300.

[0061] Based on the above description of the oxygen production system of the present application, the operating principle of the oxygen production system is described in detail below:

[0062] Before the oxygen production system produces oxygen, the extraction buffer device 600 is first operated at no load to preheat the extraction buffer device 600 to ensure the stability and reliability of its subsequent operation.

[0063] The oxygen production system operates as follows:

[0064] Step S1, open the first switch valve 11 and the fourth switch valve 41, close the equalizing valve 500, the second switch valve 21, and the third switch valve 31, and pass the compressed air into the first adsorption tower 200. The first adsorption tower 200 adsorbs and enriches the oxygen in the compressed air, and the remaining non-oxygen gas in the compressed air is introduced into the exhaust gas buffer device 400 through the first pipeline 10. At the same time, the extraction buffer device 600 vacuums and reduces the pressure of the second adsorption tower 300 that has completed the adsorption of oxygen through the fourth pipeline 40, so as to desorb and collect the oxygen adsorbed in the second adsorption tower 300.

[0065] Step S2, open the pressure equalizing valve 500 to allow part of the non-oxygen gas remaining in the first adsorption tower 200 to enter the second adsorption tower 300, the first adsorption tower 200 is depressurized, and the second adsorption tower 300 is pressurized, so as to achieve pressure equalization between the first adsorption tower 200 and the second adsorption tower 300, ensure the pressure balance of the system, and reduce the risk of damage to various equipment such as switch valves due to pressure changes.

[0066] Step S3, open the second switch valve 21 and the third switch valve 31, close the equalizing valve 500, the first switch valve 11, and the fourth switch valve 41, and pass the compressed air into the second adsorption tower 300. The second adsorption tower 300 adsorbs and enriches the oxygen in the compressed air, and the remaining non-oxygen gas in the compressed air is introduced into the exhaust gas buffer device 400 through the second pipeline 20; at the same time, the extraction buffer device 600 vacuums and reduces the pressure of the first adsorption tower 200 that has completed the adsorption of oxygen through the third pipeline 30, so as to desorb and collect the oxygen adsorbed in the first adsorption tower 200.

[0067] Step S4, open the pressure equalizing valve 500 to allow part of the non-oxygen gas remaining in the second adsorption tower 300 to enter the first adsorption tower 200, the second adsorption tower 300 is depressurized, and the first adsorption tower 200 is pressurized to achieve pressure equalization of the first adsorption tower 200 and the second adsorption tower 300.

[0068] Step S5, repeat the above steps S1 to S4.

[0069] In this way, the extraction buffer device 600 continuously collects oxygen with higher purity, effectively improving the efficiency of producing oxygen.

[0070] It can be understood that in the oxygen production system of the present application, through the coordinated arrangement of the first adsorption tower 200, the second adsorption tower 300, the exhaust gas buffer device 400 and the extraction buffer device 600, during the process of producing oxygen, when one of the first adsorption tower 200 and the second adsorption tower 300 adsorbs oxygen in the compressed air and guides the non-absorbed non-oxygen gas in the compressed air to the exhaust gas buffer device 400, the extraction buffer device 600 simultaneously vacuums and reduces the pressure in the other adsorption tower to synchronously desorb the oxygen adsorbed in the adsorption tower, and then extracts and collects it. At the same time, after the extraction buffer device 600 extracts oxygen each time, the equalizing valve 500 is opened for a period of time to make the pressures of the first adsorption tower 200 and the second adsorption tower 300 relatively balanced, so as to ensure the pressure balance of the system and reduce the risk of damage to various equipment such as switch valves due to pressure changes.

[0071] In this way, the first adsorption tower 200 and the second adsorption tower 300 alternately perform the action of adsorbing oxygen and the action of desorbing oxygen under the action of the extraction buffer device 600, so that the extraction buffer device 600 can continuously produce oxygen with higher purity. Compared with the traditional oxygen production system, the oxygen production process is simplified and the oxygen production efficiency is effectively improved.

[0072] In some embodiments of the present application, see Figure 1 The first pipeline 10 and the second pipeline 20 are both connected to the exhaust gas buffer device 400 through the fifth pipeline 50 , and the first pipeline 10 and the second pipeline 20 are connected, and the fifth pipeline 50 is provided with a fifth switch valve 51 .

[0073] Specifically, the oxygen production system includes a first three-way pipe joint (not shown in the figure), the first adsorption tower 200 is connected to the first interface of the first three-way pipe joint through the first pipeline 10, the second adsorption tower 300 is connected to the second interface of the first three-way pipe joint through the second pipeline 20, and the exhaust gas buffer device 400 is connected to the third interface of the first three-way pipe joint through the fifth pipeline 50.

[0074] In this way, when the first switch valve 11 and the second switch valve 21 are both opened and the fifth switch valve 51 is closed, the first pipeline 10 and the second pipeline 20 are connected, and when one of the first switch valve 11 and the second switch valve 21 is closed, the first pipeline 10 and the second pipeline 20 are not connected.

[0075] Through the above arrangement, on the one hand, the piping arrangement among the exhaust gas buffer device 400, the first adsorption tower 200 and the second adsorption tower 300 is simplified, the design and installation of the corresponding piping are reduced, and the overall operation failure rate of the oxygen production system is reduced.

[0076] On the other hand, when the oxygen production system of the present application executes the aforementioned step S1 of "introducing the compressed air into the first adsorption tower 200, the first adsorption tower 200 adsorbs and enriches the oxygen in the compressed air, and the remaining non-oxygen gas in the compressed air is introduced into the exhaust gas buffer device 400 through the first pipeline 10" and before executing the aforementioned step S1 of "the extraction buffer device 600 vacuums and reduces the pressure of the first adsorption tower 200 that has completed the adsorption of oxygen through the third pipeline 30, so as to desorb and collect the oxygen adsorbed in the first adsorption tower 200", the following step S12 is executed, the fifth switch valve 51 is closed and the opening Open the first switch valve 11 and the second switch valve 21 to connect the first pipeline 10 and the second pipeline 20, so that part of the non-oxygen gas remaining in the first adsorption tower 200 enters the second adsorption tower 300 through the first pipeline 10 and the second pipeline 20, so that the partial pressure of the non-oxygen gas in the second adsorption tower 300 is relatively increased, and the partial pressure of oxygen is relatively reduced, thereby reducing the adsorption force of the carbon molecular sieve in the second adsorption tower 300 on oxygen. In this way, the oxygen adsorbed in the second adsorption tower 300 is easier to be desorbed, and the amount of oxygen extracted to the second adsorption tower 300 by the extraction buffer device 600 is increased, thereby improving the purity and efficiency of oxygen production.

[0077] Similarly, when the oxygen production system of the present application executes the aforementioned step S3 of "introducing the compressed air into the second adsorption tower 300, the second adsorption tower 300 adsorbs and enriches the oxygen in the compressed air, and the remaining non-oxygen gas in the compressed air is introduced into the exhaust gas buffer device 400 through the second pipeline 20" and before executing the aforementioned step S3 of "the extraction buffer device 600 vacuums and reduces the pressure of the first adsorption tower 200 that has completed the adsorption of oxygen through the third pipeline 30, so as to desorb and collect the oxygen adsorbed in the first adsorption tower 200", execute the following step S32, close the fifth switch valve 51 and open The first switch valve 11 and the second switch valve 21 connect the first pipeline 10 and the second pipeline 20, so that part of the non-oxygen gas remaining in the second adsorption tower 300 enters the first adsorption tower 200 through the second pipeline 20 and the first pipeline 10, so that the partial pressure of the non-oxygen gas in the first adsorption tower 200 is relatively increased, and the partial pressure of oxygen is relatively reduced, thereby reducing the adsorption force of the carbon molecular sieve in the first adsorption tower 200 on oxygen. In this way, the oxygen adsorbed in the first adsorption tower 200 is easier to be desorbed, and the amount of oxygen extracted to the first adsorption tower 200 by the extraction buffer device 600 is increased, thereby improving the purity and efficiency of oxygen production.

[0078] In some embodiments of the present application, see Figure 1 The outlet of the first adsorption tower 200 and the outlet of the second adsorption tower 300 are connected through the sixth pipeline 60 , and the pressure equalizing valve 500 is disposed on the sixth pipeline 60 .

[0079] It is understandable that after each extraction buffer device 600 extracts oxygen from the first adsorption tower 200 or the second adsorption tower 300, the equalizing valve 500 is opened for a period of time, which is set according to the actual equipment scale, such as 3s, 7s, 10s, etc.

[0080] When the pressure equalizing valve 500 is opened, the first adsorption tower 200 and the second adsorption tower 300 are connected through the sixth pipeline 60, and the pressure of the two is equalized, so that the pressure of the first adsorption tower 200 and the second adsorption tower 300 is relatively balanced, and the system pressure balance is also ensured, reducing the risk of damage to various switch valves and other equipment due to pressure changes.

[0081] In addition, by setting the pressure equalizing valve 500 on the sixth pipeline 60 between the outlet of the first adsorption tower 200 and the outlet of the second adsorption tower 300, the pipeline layout between the pressure equalizing valve 500 and the first adsorption tower 200 and the second adsorption tower 300 can be simplified, the design and installation of the corresponding pipelines can be reduced, and the overall operating failure rate of the oxygen production system can be reduced.

[0082] In addition, it should be noted that when the fifth switch valve 51 is closed and the first switch valve 11 and the second switch valve 21 are opened to connect the first pipeline 10 and the second pipeline 20, the equalizing valve 500 is in a closed state to prevent excessive non-oxygen gas from entering the first adsorption tower 200 or the second adsorption tower 300 in the desorption process and reducing the purity of oxygen production.

[0083] In some embodiments of the present application, see Figure 2 The third pipeline 30 and the fourth pipeline 40 are both connected to the extraction buffer device 600 through the seventh pipeline 70. The seventh pipeline 70 is connected to the first exhaust branch 102, and the first exhaust branch 102 is provided with a tenth switch valve 103.

[0084] Specifically, the first exhaust branch 102 includes a first sub-exhaust branch 1021 and a second sub-exhaust branch 1022, the first sub-exhaust branch 1021 and the second sub-exhaust branch 1022 are arranged in parallel through the seventh pipeline 70, the exhaust ports of the first sub-exhaust branch 1021 and the second sub-exhaust branch 1022 are connected to the ambient space, and the tenth switch valve 103 includes a first automatic valve 1031 arranged on the first sub-exhaust branch 1021 and a first manual valve 1032 arranged on the second sub-exhaust branch 1022.

[0085] The control module of the oxygen production system is electrically connected to the first automatic valve 1031. Before the oxygen production system is operated, the control module can control the first switch valve 11, the second switch valve 21, the third switch valve 31, the fourth switch valve 41 and the first automatic valve 1031 to be all opened, and control the first adsorption tower 200, the second adsorption tower 300 and the extraction buffer device 600 to run at no load, while preheating each device in the oxygen production system, and discharging the impurity gas in the pipeline through the first automatic valve 1031.

[0086] In addition, during the operation of the oxygen production system, when the operator monitors that the pressure of the seventh pipeline 70 is too high according to the corresponding pressure sensor, the operator can manually open the first manual valve 1032 of the second sub-exhaust branch 1022 to relieve the pressure of the seventh pipeline 70, so as to ensure the overall reliable operation of the oxygen production system.

[0087] It is not difficult to understand that the third pipeline 30 and the fourth pipeline 40 are both connected to the extraction buffer device 600 through the seventh pipeline 70, which is conducive to simplifying the overall pipeline layout of the oxygen production system. The first exhaust branch 102 and the corresponding tenth switch valve 103 are connected to the seventh pipeline 70, so that the impurity gas in the system pipeline can be discharged before the oxygen production system is operated. At the same time, the pipeline pressure of the seventh pipeline 70 can be adjusted accordingly.

[0088] In some embodiments of the present application, see Figure 2 The oxygen production system also includes an air compressor 100, which is used to compress air into compressed air and transport the compressed air to the first adsorption tower 200 and the second adsorption tower 300. The air compressor 100 is connected to the first adsorption tower 200 and the second adsorption tower 300 through the eighth pipeline 80 and the ninth pipeline 90 respectively. The eighth pipeline 80 and the ninth pipeline 90 are respectively provided with an eighth switch valve 81 and a ninth switch valve 91.

[0089] Specifically, the air compressor 100 is a conventional air compressor, which is used to introduce and compress air to obtain compressed air. When the air is compressed into compressed air and enters the first adsorption tower 200, the carbon molecular sieve filled in the first adsorption tower 200 can more effectively adsorb oxygen in the compressed air under high pressure, thereby improving the separation efficiency of oxygen and non-oxygen gas.

[0090] It is easy to understand that when the first adsorption tower 200 is performing the oxygen adsorption action, the extraction buffer device 600 is synchronously performing the desorption and oxygen extraction action on the second adsorption tower 300. During this process, the eighth switch valve 81 is opened and the ninth switch valve 91 is closed, so that the air compressor 100 delivers compressed air to the first adsorption tower 200 alone, ensuring that the oxygen adsorption action of the first adsorption tower 200 and the desorption and oxygen extraction action of the second adsorption tower 300 by the extraction buffer device 600 are performed synchronously while being independent of each other and not interfering with each other.

[0091] Further, see Figure 2 The eighth pipeline 80 and the ninth pipeline 90 are both connected to the outlet of the air compressor 100 through the tenth pipeline 101 . The tenth pipeline 101 is connected to the second exhaust branch 104 , and the second exhaust branch 104 is provided with an eleventh switch valve 105 .

[0092] Specifically, the second exhaust branch 104 includes a third sub-exhaust branch 1041 and a fourth sub-exhaust branch 1042, the third sub-exhaust branch 1041 and the fourth sub-exhaust branch 1042 are arranged in parallel through the tenth pipeline 101, the exhaust ports of the third sub-exhaust branch 1041 and the fourth sub-exhaust branch 1042 are connected to the ambient space, and the eleventh switch valve 105 includes a second automatic valve 1051 arranged on the third sub-exhaust branch 1041 and a second manual valve 1052 arranged on the fourth sub-exhaust branch 1042.

[0093] The control module of the oxygen production system is electrically connected to the second automatic valve 1051. Before the oxygen production system is operated, the control module can control the first switch valve 11, the second switch valve 21, the third switch valve 31, the fourth switch valve 41, the first automatic valve 1031 and the second automatic valve 1051 to be all opened, and control the first adsorption tower 200, the second adsorption tower 300, the extraction buffer device 600 and the air compressor 100 to run at no load, while preheating each device in the oxygen production system, and discharging the impurity gas in the pipeline through the first automatic valve 1031 and the second automatic valve 1051.

[0094] In addition, during the operation of the oxygen production system, when the operator monitors that the pressure of the tenth pipeline 101 is too high according to the corresponding pressure sensor, the operator can manually open the second manual valve 1052 on the fourth sub-exhaust branch 1042 to relieve the pressure on the tenth pipeline 101, so that the oxygen production system as a whole can operate reliably.

[0095] It is not difficult to understand that the eighth pipeline 80 and the ninth pipeline 90 are both connected to the outlet of the air compressor 100 through the tenth pipeline 101, which is conducive to simplifying the overall pipeline layout of the oxygen production system. The second exhaust branch 104 and the corresponding eleventh switch valve 105 are arranged in connection with the tenth pipeline 101, so that the impurity gas in the system pipeline can be discharged before the oxygen production system is operated, and at the same time, the pipeline pressure of the tenth pipeline 101 can be adjusted accordingly.

[0096] In some embodiments of the present application, see Figure 1 and Figure 2 The oxygen production system further includes an air purification device 700 , which is disposed at the inlet of the air compressor 100 and is used to remove dust and dry the air entering the air compressor 100 .

[0097] In the present application, the air purification device 700 includes a multi-layer filter system, including a primary filter, a HEPA filter, and an activated carbon filter. The air purification device 700 can purify and remove PM2.5, dust, pollen, harmful gases, bacteria, viruses in the air, and eliminate odors in the air. At the same time, it can also dry the air and remove water vapor in the air, thereby improving the cleanliness and purity of the produced oxygen.

[0098] In some embodiments of the present application, see Figure 1 and Figure 2 The extraction buffer device 600 includes a negative pressure mechanism 610 and an oxygen buffer tank 620, and the negative pressure mechanism 610 and the oxygen buffer tank 620 are connected.

[0099] Specifically, the negative pressure mechanism 610 is a vacuum extraction device, and the oxygen buffer tank 620 is a container capable of storing oxygen. The negative pressure mechanism 610 and the oxygen buffer tank 620 are connected, and the negative pressure mechanism 610 is connected to the first adsorption tower 200 and the second adsorption tower 300 through the third pipeline 30 and the fourth pipeline 40 respectively, so as to extract the oxygen adsorbed in the first adsorption tower 200 and the second adsorption tower 300 by vacuum extraction, and transport the extracted oxygen to the oxygen buffer tank 620, so that the oxygen buffer tank 620 collects and stores the oxygen.

[0100] In addition, based on the above description, an embodiment of the present application further provides an oxygen production method, which is used to operate the oxygen production system of any of the above embodiments, and the oxygen production method includes the following steps:

[0101] Step S10, compressed air is introduced into the first adsorption tower 200, the first adsorption tower 200 adsorbs and enriches the oxygen in the compressed air, and the remaining non-oxygen gas in the compressed air that is not adsorbed is introduced into the exhaust gas buffer device 400. At the same time, the extraction buffer device 600 vacuums and depressurizes the second adsorption tower 300 that has completed the adsorption of oxygen, so as to desorb and collect the oxygen adsorbed in the second adsorption tower 300;

[0102] Step S20, opening the pressure equalizing valve 500 to allow part of the non-oxygen gas remaining in the first adsorption tower 200 to enter the second adsorption tower 300;

[0103] Step S30, the compressed air is introduced into the second adsorption tower 300, the second adsorption tower 300 adsorbs and enriches the oxygen in the compressed air, and the remaining non-oxygen gas in the compressed air that is not adsorbed is introduced into the exhaust gas buffer device 400. At the same time, the extraction buffer device 600 vacuums and depressurizes the first adsorption tower 200 that has completed the adsorption of oxygen, so as to desorb and collect the oxygen adsorbed in the first adsorption tower 200;

[0104] Step S40, opening the pressure equalizing valve 500 to allow part of the non-oxygen gas remaining in the second adsorption tower 300 to enter the first adsorption tower 200;

[0105] Step S50: repeat the above steps S10 to S40.

[0106] Specifically, step S10 includes step S1: opening the first switch valve 11 and the fourth switch valve 41, closing the equalizing valve 500, the second switch valve 21, and the third switch valve 31, and passing the compressed air into the first adsorption tower 200. The first adsorption tower 200 adsorbs and enriches the oxygen in the compressed air, and the remaining non-oxygen gas in the compressed air is introduced into the exhaust gas buffer device 400 through the first pipeline 10. At the same time, the extraction buffer device 600 vacuums and reduces the pressure of the second adsorption tower 300 that has completed the adsorption of oxygen through the fourth pipeline 40, so as to desorb and collect the oxygen adsorbed in the second adsorption tower 300.

[0107] Step S20 includes step S2: opening the pressure equalizing valve 500 to allow part of the non-oxygen gas remaining in the first adsorption tower 200 to enter the second adsorption tower 300, reducing the pressure of the first adsorption tower 200 and increasing the pressure of the second adsorption tower 300, thereby achieving pressure equalization between the first adsorption tower 200 and the second adsorption tower 300, ensuring the pressure balance of the system, and reducing the risk of damage to various equipment such as switch valves due to pressure changes.

[0108] Step S30 includes step S3: opening the second switch valve 21 and the third switch valve 31, closing the equalizing valve 500, the first switch valve 11, and the fourth switch valve 41, and passing the compressed air into the second adsorption tower 300, the second adsorption tower 300 adsorbs and enriches the oxygen in the compressed air, and the remaining non-oxygen gas in the compressed air is introduced into the exhaust gas buffer device 400 through the second pipeline 20; at the same time, the extraction buffer device 600 vacuums and reduces the pressure of the first adsorption tower 200 that has completed the adsorption of oxygen through the third pipeline 30, so as to desorb and collect the oxygen adsorbed in the first adsorption tower 200.

[0109] Step S40 includes step S4: opening the pressure equalizing valve 500 to allow part of the non-oxygen gas remaining in the second adsorption tower 300 to enter the first adsorption tower 200, reducing the pressure of the second adsorption tower 300 and increasing the pressure of the first adsorption tower 200 to achieve pressure equalization of the first adsorption tower 200 and the second adsorption tower 300.

[0110] Step S50 includes step S5: repeating the above steps S1 to S4.

[0111] In this way, the extraction buffer device 600 continuously collects oxygen with higher purity, effectively improving the efficiency of producing oxygen.

[0112] It can be understood that in the oxygen production method of the present application, through the coordinated arrangement of the first adsorption tower 200, the second adsorption tower 300, the exhaust gas buffer device 400 and the extraction buffer device 600, during the process of producing oxygen, when one of the first adsorption tower 200 and the second adsorption tower 300 adsorbs oxygen in the compressed air and guides the non-absorbed non-oxygen gas in the compressed air to the exhaust gas buffer device 400, the extraction buffer device 600 simultaneously vacuums and reduces the pressure in the other adsorption tower to synchronously desorb the oxygen adsorbed in the adsorption tower, and then extracts and collects it. At the same time, after the extraction buffer device 600 extracts oxygen each time, the equalizing valve 500 is opened for a period of time to make the pressures of the first adsorption tower 200 and the second adsorption tower 300 relatively balanced, so as to ensure the pressure balance of the system and reduce the risk of damage to various equipment such as switching valves due to pressure changes.

[0113] In this way, the first adsorption tower 200 and the second adsorption tower 300 alternately perform the action of adsorbing oxygen and the action of desorbing oxygen under the action of the extraction buffer device 600, so that the extraction buffer device 600 can continuously produce oxygen with higher purity. Compared with the traditional oxygen production system, the oxygen production process is simplified and the oxygen production efficiency is effectively improved.

[0114] In some embodiments of the present application, step S1 includes:

[0115] Step 11, open the first switch valve 11, close the equalizing valve 500, and pass the compressed air into the first adsorption tower 200. The first adsorption tower 200 adsorbs and enriches the oxygen in the compressed air, and the remaining non-oxygen gas in the compressed air is introduced into the exhaust gas buffer device 400 through the first pipeline 10.

[0116] Step 12, close the fifth switch valve 51, open the first switch valve 11 and the second switch valve 21, so that the first pipeline 10 and the second pipeline 20 are connected for a first preset time;

[0117] Step 13, opening the fourth switch valve 41, closing the first switch valve 11 and the second switch valve 21, and the extraction buffer device 600 evacuates and depressurizes the second adsorption tower 300 that has completed the adsorption of oxygen through the fourth pipeline 40, so as to desorb and collect the oxygen adsorbed in the second adsorption tower 300;

[0118] Among them, the first preset time is set according to the scale of the actual oxygen production system and is not limited.

[0119] By causing the oxygen production system to perform step 12 after performing the above-mentioned step 11 and before performing step 13, the first pipeline 10 and the second pipeline 20 are turned on for a first preset time, so that part of the non-oxygen gas remaining in the first adsorption tower 200 enters the second adsorption tower 300 through the first pipeline 10 and the second pipeline 20, so that the partial pressure of the non-oxygen gas in the second adsorption tower 300 is relatively increased, and the partial pressure of oxygen is relatively reduced, thereby reducing the adsorption force of the carbon molecular sieve in the second adsorption tower 300 on oxygen. In this way, the oxygen adsorbed in the second adsorption tower 300 is easier to be desorbed, and the amount of oxygen extracted to the second adsorption tower 300 by the extraction buffer device 600 is increased, thereby improving the purity and efficiency of oxygen production.

[0120] Similarly, step S3 includes:

[0121] S31, open the second switch valve 21, close the pressure equalizing valve 500, and pass the compressed air into the second adsorption tower 300, the second adsorption tower 300 adsorbs and enriches the oxygen in the compressed air, and the remaining non-oxygen gas in the compressed air that is not adsorbed is introduced into the exhaust gas buffer device 400 through the second pipeline 20;

[0122] S32, close the fifth switch valve 51, open the first switch valve 11 and the second switch valve 21, so that the first pipeline 10 and the second pipeline 20 are connected for a second preset time;

[0123] S33, open the third switch valve 31, close the first switch valve 11 and the second switch valve 21, and the extraction buffer device 600 vacuums and reduces the pressure of the first adsorption tower 200 that has completed the adsorption of oxygen through the third pipeline 30 to desorb and collect the oxygen adsorbed in the first adsorption tower 200.

[0124] The second preset time is set according to the actual scale of the oxygen production system and is not limited.

[0125] By making the oxygen production system perform step 32 after performing the above-mentioned step 31 and before performing step 33, the first pipeline 10 and the second pipeline 20 are connected, so that part of the non-oxygen gas remaining in the second adsorption tower 300 enters the first adsorption tower 200 through the second pipeline 20 and the first pipeline 10, so that the partial pressure of the non-oxygen gas in the first adsorption tower 200 is relatively increased, and the partial pressure of oxygen is relatively reduced, thereby reducing the adsorption force of the carbon molecular sieve in the first adsorption tower 200 on oxygen. In this way, the oxygen adsorbed in the first adsorption tower 200 is easier to be desorbed, and the amount of oxygen extracted to the first adsorption tower 200 by the extraction buffer device 600 is increased, thereby improving the purity and efficiency of oxygen production.

[0126] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0127] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. An oxygen production system, characterized in that: include: A first adsorption tower and a second adsorption tower, wherein the first adsorption tower and the second adsorption tower are both used to introduce compressed air and adsorb oxygen in the compressed air, and the first adsorption tower and the second adsorption tower are connected through a pressure equalizing valve; an exhaust gas buffer device, connected to the first adsorption tower and the second adsorption tower through a first pipeline and a second pipeline respectively, for recovering the non-oxygen gas discharged from the first adsorption tower and the second adsorption tower; an extraction buffer device, connected to the first adsorption tower and the second adsorption tower through a third pipeline and a fourth pipeline respectively, for extracting oxygen adsorbed in the first adsorption tower and the second adsorption tower; The first pipeline, the second pipeline, the third pipeline and the fourth pipeline are respectively provided with a first switch valve, a second switch valve, a third switch valve and a fourth switch valve.

2. The oxygen production system according to claim 1, characterized in that: The first pipeline and the second pipeline are both connected to the exhaust gas buffer device through a fifth pipeline, and the first pipeline is connected to the second pipeline. A fifth switch valve is provided on the fifth pipeline.

3. The oxygen production system according to claim 1, characterized in that: The outlet of the first adsorption tower and the outlet of the second adsorption tower are connected through a sixth pipeline, and the pressure equalizing valve is arranged on the sixth pipeline.

4. The oxygen production system according to claim 1, characterized in that: The third pipeline and the fourth pipeline are both connected to the extraction buffer device through a seventh pipeline, the seventh pipeline is connected to a first exhaust branch, and a tenth switch valve is provided on the first exhaust branch.

5. The oxygen production system according to claim 1, characterized in that: The oxygen production system also includes an air compressor, which is used to compress air into compressed air and transport the compressed air to the first adsorption tower and the second adsorption tower. The air compressor is connected to the first adsorption tower and the second adsorption tower through an eighth pipeline and a ninth pipeline respectively. An eighth switch valve and a ninth switch valve are respectively provided on the eighth pipeline and the ninth pipeline.

6. The oxygen production system according to claim 5, characterized in that: The eighth pipeline and the ninth pipeline are both connected to the outlet of the air compressor through the tenth pipeline, the tenth pipeline is connected to a second exhaust branch, and the second exhaust branch is provided with an eleventh switch valve.

7. The oxygen production system according to claim 5, characterized in that: The oxygen production system further comprises an air purification device, which is arranged at the inlet of the air compressor and is used for removing dust and drying the air entering the air compressor.

8. The oxygen production system according to any one of claims 1 to 6, characterized in that: The extraction buffer device comprises a negative pressure mechanism and an oxygen buffer tank, and the negative pressure mechanism is connected to the oxygen buffer tank.

9. A method for producing oxygen, characterized in that: The oxygen production method is used to operate the oxygen production system according to any one of claims 1 to 8, and the oxygen production method comprises the following steps: Step S1, compressed air is introduced into the first adsorption tower, the first adsorption tower adsorbs and enriches the oxygen in the compressed air, and the remaining non-oxygen gas in the compressed air is introduced into the exhaust gas buffer device. At the same time, the extraction buffer device vacuums and depressurizes the second adsorption tower that has completed the oxygen adsorption, so as to desorb and collect the oxygen adsorbed in the second adsorption tower; Step S2, opening the pressure equalizing valve to allow part of the non-oxygen gas remaining in the first adsorption tower to enter the second adsorption tower; Step S3, the compressed air is introduced into the second adsorption tower, the second adsorption tower adsorbs and enriches the oxygen in the compressed air, and the remaining non-oxygen gas in the compressed air is introduced into the exhaust gas buffer device. At the same time, the extraction buffer device vacuums and depressurizes the first adsorption tower that has completed the adsorption of oxygen, so as to desorb and collect the oxygen adsorbed in the first adsorption tower; Step S4, opening the pressure equalizing valve to allow part of the non-oxygen gas remaining in the second adsorption tower to enter the first adsorption tower; Step S5, repeat the above steps S1 to S4.

10. The oxygen production method according to claim 9, characterized in that: The step S1 comprises: Step 11: Open the first switch valve, close the pressure equalizing valve, and pass the compressed air into the first adsorption tower. The first adsorption tower adsorbs and enriches the oxygen in the compressed air, and the remaining non-oxygen gas in the compressed air is introduced into the exhaust gas buffer device through the first pipeline. Step 12, close the fifth switch valve, open the first switch valve and the second switch valve, so that the first pipeline and the second pipeline are connected for a first preset time; Step 13, opening the fourth switch valve, closing the first switch valve and the second switch valve, and the extraction buffer device evacuates and depressurizes the second adsorption tower that has completed oxygen adsorption through the fourth pipeline to desorb and collect the oxygen adsorbed in the second adsorption tower; And / or, step S3 includes: S31, open the second switch valve, close the pressure equalizing valve, and pass the compressed air into the second adsorption tower, the second adsorption tower adsorbs and enriches the oxygen in the compressed air, and the remaining non-oxygen gas in the compressed air that is not adsorbed is introduced into the exhaust gas buffer device through the second pipeline; S32, closing the fifth switch valve, opening the first switch valve and the second switch valve, so that the first pipeline and the second pipeline are connected for a second preset time; S33, opening the third switch valve, closing the first switch valve and the second switch valve, and the extraction buffer device evacuates and reduces the pressure of the first adsorption tower that has completed oxygen adsorption through the third pipeline to desorb and collect the oxygen adsorbed in the first adsorption tower.

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