Negative pressure membrane oxygen enrichment system with magnetic separation

Abstract

The utility model relates to the technical field of gas separation, and aims to provide a negative pressure membrane oxygen enrichment system with magnetic separation. The system comprises an air filter, a ventilator and a negative pressure membrane oxygen generation device which are sequentially connected through an air inlet pipeline, and a first superconducting magnet and a second superconducting magnet which are connected with a direct-current power supply in parallel through wires, wherein the main body of the negative pressure film oxygen generation device is of a box body structure, the first superconducting magnet and the second superconducting magnet are arranged on the two sides of the box body in parallel, and the magnetic line of force between the first superconducting magnet and the second superconducting magnet unidirectionally penetrates through the whole negative pressure film oxygen generation device; a plurality of separation cavities are arranged in a box body of the negative pressure membrane oxygen generation device and are respectively divided into an air inlet cavity and a negative pressure cavity which are independent from each other by an inclined breathable support plate, and an oxygen-enriched separation membrane is arranged on the surface of the breathable support plate. According to the utility model, the permeability selectivity of the oxygen-enriched separation membrane is organically combined with the characteristics that oxygen molecules have paramagnetism and nitrogen molecules have diamagnetism, so that the treatment capacity and the treatment efficiency of the prepared oxygen-enriched gas can be comprehensively improved.

Description

Technical Field

[0001] This utility model relates to the field of gas separation technology, specifically to a negative pressure membrane oxygen enrichment system with magnetic separation. Background Technology

[0002] Negative pressure membrane oxygen-enrichment separation technology is a physical oxygen production method based on the principle of selective gas permeation. Its core principle is to achieve gas separation by utilizing the difference in permeation rates of oxygen and nitrogen through polymer membrane materials. Originating from the industrial application of gas separation membranes in the 1980s, this technology offers significant advantages over traditional cryogenic and pressure swing adsorption (PSA) methods, including compact equipment structure, low energy consumption, and no moving parts. It has shown application potential in fields such as industrial combustion enhancement and wastewater treatment.

[0003] Currently, negative pressure membrane oxygen-enrichment separation equipment used in industrial combustion applications typically employs a multi-layer composite membrane stacked structure and optimized flow channel design. Although the oxygen concentration produced by negative pressure membrane systems can reach up to 45%-50% (oxygen volume fraction), actual materials may not achieve ideal performance due to process or cost limitations. In actual operation, industrial units usually only maintain an oxygen concentration of around 30%. To increase the oxygen concentration and flow rate of negative pressure membrane systems, the conventional approach is to replace the vacuum pump with a high-power one and optimize the membrane system structure, or to perform a re-separation operation on the already produced oxygen. However, both of these methods further reduce separation efficiency, leading to a decline in overall efficiency and making it difficult to achieve the ideal input-output ratio.

[0004] Magnetically induced air separation is an emerging air separation method that primarily utilizes the difference in magnetic susceptibility between oxygen and nitrogen gases to achieve separation. Oxygen in the air is a paramagnetic gas, with the highest magnetic susceptibility among common gases. Nitrogen is a diamagnetic gas; under standard conditions, the absolute value of the magnetic susceptibility of oxygen is approximately 250 times that of nitrogen. Due to the huge difference in magnetic susceptibility between oxygen and nitrogen molecules, they will experience magnetization in opposite directions in a gradient magnetic field, resulting in different molecular diffusion behaviors. This forms the basis of magnetically induced air separation.

[0005] Chinese patent document CN1116129A describes a magnetic air separation method and apparatus, which consists of basic components such as permanent magnets, an oxygen channel, and an electric heating element. Permanent magnets are symmetrically arranged on both sides of one end of the oxygen channel to generate a non-uniform magnetic field. An electric heating element is arranged in the middle section of the oxygen channel. By magnetizing oxygen in the air with the non-uniform magnetic field and changing the volumetric magnetic susceptibility through heating to create thermomagnetic convection, oxygen is separated from the air to produce low-purity oxygen or oxygen-enriched air. However, this method relies solely on magnetic separation, resulting in low overall oxygen concentration and gas production. In practical applications, it can only meet the needs of household or general civilian oxygen supply and cannot satisfy the requirements of industrial production.

[0006] Therefore, it is necessary to propose new solutions to address the aforementioned problems. Utility Model Content

[0007] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a negative pressure membrane oxygen enrichment system with magnetic separation.

[0008] To solve the technical problem, the solution of this utility model is:

[0009] A negative pressure membrane oxygen-enrichment system with magnetic separation is provided. The system includes an air filter, a ventilator, and a negative pressure membrane oxygen generator connected in sequence through an air inlet pipe, as well as a first superconducting magnet and a second superconducting magnet connected in parallel to a DC power supply through wires. The main body of the negative pressure membrane oxygen generator is a box structure. The first and second superconducting magnets are arranged in parallel on both sides of the box, and the magnetic lines of force between them run through the entire negative pressure membrane oxygen generator in one direction.

[0010] The negative pressure membrane oxygen generator has multiple parallel and alternating sealing partitions inside the housing, dividing the interior into multiple sequentially arranged separation chambers. Each separation chamber has an inclined ventilated support plate, which separates the separation chamber into an independent air inlet chamber and a negative pressure chamber. An oxygen-enriched separation membrane is provided on the surface of the ventilated support plate. One end of the ventilated support plate is connected to the non-edge position of the outlet side end plate. A nitrogen-enriched outlet connecting to the air inlet chamber and an oxygen-enriched outlet connecting to the negative pressure chamber are provided on this side end plate. An air inlet is provided on the opposite side end plate. The air inlet is connected to the air inlet pipe through a branch pipe, the nitrogen-enriched outlet is connected to the exhaust pipe, and the oxygen-enriched outlet is connected to the vacuum pump through an oxygen-enriched gas collection pipe.

[0011] As an improved solution, the breathable support plate is a thin plate made of rigid breathable material, or a rigid plate with several through-holes arranged in an array.

[0012] As an improved solution, at least two-thirds of the permeable support plates are selected and arranged in the middle area. An oxygen-enriched separation membrane is attached to one side surface and a soft magnetic film is attached to the other side surface. The soft magnetic film has several through-holes arranged in an array.

[0013] As an improved solution, the soft magnetic film located on the central breathable support plate has the largest thickness, and the thickness of the soft magnetic films arranged on the breathable support plates on both sides decreases sequentially; through the gradient change in the thickness of the soft magnetic film, the magnetic field balance in each cavity inside the negative pressure membrane oxygen generator box is achieved.

[0014] As an improved solution, each sealing partition has the same thickness, each breathable support plate has the same thickness, and each oxygen-enriched separation membrane has the same thickness; the thickness change rate of the soft magnetic film transitions smoothly with an exponential gradient, and the magnetic circuit continuity between the first superconducting magnet and the second superconducting magnet is maintained by an appropriate magnetic field enhancement amplitude.

[0015] As an improved solution, the box structure of the negative pressure membrane oxygen generator includes parallel box side plates; at the air inlet and exhaust ends of the box, there are several sets of parallel first end plates and second end plates respectively; the first end plates and second end plates in the same set, together with the box side plates and sealing partitions, form a separation chamber; adjacent separation chambers share a sealing partition, and the outermost separation chamber uses the box top plate or box bottom plate as the sealing partition.

[0016] As an improved solution, the first end plate and the second end plate are respectively fixedly installed at both ends of the side plate of the box; on the inner surface of the first end plate and the second end plate, a first slot and a second slot for inserting the ventilated support plate are respectively provided, and the two slots are parallel to each other; wherein, the first slot is located close to the sealing partition, and the second slot is staggered from the first slot, and the nitrogen-enriched outlet and the oxygen-enriched outlet are located on the second end plate on both sides of the second slot.

[0017] As an improved solution, the exhaust pipe is open to the atmosphere, and the outlet of the vacuum pump is connected to the oxygen enrichment module through a pipeline; the oxygen enrichment module includes an oxygen enrichment storage tank, the top of which is connected to the finished oxygen enrichment pipeline, and the bottom of which is connected to the maintenance valve, the drain valve and the water storage tank in sequence through a drain pipeline; a gas state sensor for monitoring the pressure, flow rate and temperature of the oxygen enrichment air is also installed on the finished oxygen enrichment pipeline.

[0018] As an improved solution, each negative pressure chamber is equipped with a gas state sensor for monitoring the pressure, flow rate, and temperature of oxygen-enriched air.

[0019] As an improved solution, the oxygen-enriched separation membrane is a plate-type membrane structure made of membrane material of any one of polysulfone, polyimide or polyphenylene ether.

[0020] Compared with the prior art, the beneficial effects of this utility model are:

[0021] 1. Considering the requirements of oxygen production system processing capacity in industrial production scenarios, this utility model innovatively adopts multiple separation chambers operating in parallel, and is supplemented by negative pressure membrane oxygen enrichment and magnetic separation technology. It organically combines the permeation selectivity of oxygen enrichment separation membrane with the paramagnetic properties of oxygen molecules and the diamagnetic properties of nitrogen molecules, thereby comprehensively improving the processing capacity and disposal efficiency of oxygen enrichment gas.

[0022] 2. This utility model can not only effectively improve the concentration and flow rate of oxygen-enriched gas produced by the negative pressure membrane oxygen-enrichment device, better meeting the actual needs of industrial combustion, but also solve the problems of difficulty in increasing oxygen concentration and narrow adjustable flow range in the negative pressure membrane oxygen production process, thereby improving the overall operating efficiency of the negative pressure oxygen-enrichment device on site.

[0023] 3. In this utility model, the obliquely arranged permeable support plate can optimize the flow path of the raw material air and increase the permeation area, thus prolonging the contact time between the raw material air and the membrane structure; thereby increasing the interaction opportunities between the raw material air and the membrane material and effectively improving the oxygen permeation efficiency.

[0024] 4. By setting soft magnetic films with varying thicknesses on each breathable support plate, this invention can perfectly solve the problem of magnetic field attenuation inside the negative pressure membrane oxygen generator, ensuring that each separation chamber maintains a basically consistent oxygen enrichment capacity and avoiding waste of equipment capacity.

[0025] 5. By installing gas state sensors on the finished oxygen-enriched pipeline and in each negative pressure chamber, not only can the quality of the final oxygen-enriched gas output be monitored in real time, but the condition of each oxygen-enriched separation membrane can also be assessed. With two independently installed end plates, the oxygen-enriched separation membrane can be disassembled and the permeable support plate removed for replacement of individual separation chambers. This design perfectly solves the drawback of conventional designs where blockage of individual oxygen-enriched separation membranes necessitates shutting down the entire equipment for maintenance. Therefore, for industrial production scenarios requiring long-term stable operation and uninterrupted supply, this invention perfectly meets end-user needs. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the negative pressure membrane oxygen enrichment system with magnetic separation in this utility model;

[0027] Figure 2 This is a schematic diagram of a negative pressure membrane oxygen generator;

[0028] Figure 3 This is a structural schematic diagram of the first end plate;

[0029] Figure 4 This is a structural schematic diagram of the second end plate.

[0030] The attached figures are labeled as follows: 1 Air filter; 2 Ventilator; 3 DC power supply; 4 Wire; 5 First superconducting magnet; 6 Second superconducting magnet; 7 Negative pressure membrane oxygen generator; 701 Top plate of the housing; 702 First end plate; 703 Sealing partition; 704 Ventilation support plate; 705 Oxygen-enriched separation membrane; 706 Oxygen-enriched gas collection pipe; 707 Exhaust pipe; 708 Second end plate; 9 Vacuum pump; 10 Oxygen-enriched gas storage tank; 11 Inspection valve; 12 Drain valve; 13 Water storage tank. Detailed Implementation

[0031] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0032] Part 1 System Structure and Layout Description

[0033] The overall structure of the negative pressure membrane oxygen enrichment system with magnetic separation is as follows: Figure 1 As shown, the device includes an air filter 1, a fan 2, and a negative pressure membrane oxygen generator 7, connected sequentially via an air intake pipe, as well as a first superconducting magnet 5 and a second superconducting magnet 6 connected in parallel to a DC power supply 3 via wires 4. The main body of the negative pressure membrane oxygen generator 7 is a box structure. The first superconducting magnet 5 and the second superconducting magnet 6 are arranged parallel to each other on both sides of the box, with magnetic lines of force running unidirectionally through the entire negative pressure membrane oxygen generator 7. Depending on the orientation of the magnets and the internal structure of the box, the magnetic lines of force can be vertical or horizontal. The nitrogen-enriched outlet of the negative pressure membrane oxygen generator 7 is connected to the exhaust pipe and then to the atmosphere. The oxygen-enriched outlet is connected to the vacuum pump 9 through the oxygen-enriched gas collection pipe. The outlet of the vacuum pump 9 is connected to the oxygen-enriched treatment module through a pipeline. The oxygen-enriched treatment module includes an oxygen-enriched gas storage tank 10, with the top connected to the finished oxygen-enriched pipeline and the bottom connected to the maintenance valve 11, the drain valve 12, and the water storage tank 13 in sequence through the drain pipeline. On the finished oxygen-enriched pipeline, a gas state sensor is installed to monitor the pressure, flow rate, and temperature of the oxygen-enriched air.

[0034] like Figure 2 As shown, the housing of the negative pressure membrane oxygen generator 7 includes parallel side panels, a parallel top plate, and a parallel bottom plate. Inside the housing, multiple parallel, alternating sealing partitions 703 divide the interior into several sequentially arranged separation chambers. At the air inlet and exhaust ends of the housing, several sets (three sets in the figure) of parallelly arranged first end plates 702 and second end plates 708 are respectively provided. The first end plates 702 and second end plates 708 in the same set, together with the side panels and sealing partitions, form a separation chamber; adjacent separation chambers share a sealing partition 703, with the outermost separation chamber using either the top or bottom plate as a sealing partition. An air inlet is provided on the first end plate 702, and a nitrogen-enriched outlet connected to the air intake chamber and an oxygen-enriched outlet connected to the negative pressure chamber are provided on the second end plate 708. In each separation chamber, the air inlet is connected to the air intake pipe through a branch pipe, the nitrogen-enriched outlet is connected to the exhaust pipe, and the oxygen-enriched outlet is connected to the oxygen-enriched gas collection pipe through a branch pipe.

[0035] Each separation chamber is equipped with an inclined ventilated support plate 704, dividing the separation chamber into an independent air inlet chamber and a negative pressure chamber. An oxygen-enriched separation membrane 705 is provided on the surface of the ventilated support plate 704. To ensure a stable installation of the ventilated support plate 704, a first slot and a second slot are respectively provided on the inner surfaces of the first end plate 702 and the second end plate 708. The two slots are parallel to each other to insert into the end of the ventilated support plate 704 and maintain a stable and sealed installation. It can be understood that a similar slotting method can also be used to achieve a sealed installation between the side edge of the ventilated support plate 704 and the side plate of the housing. The first slot is located close to the sealing partition 703, and the second slot is staggered from the first slot so that the ventilated support plate 704 and the sealing partition 703 maintain a preset angle (i.e., an inclined installation state in the separation chamber). Based on the installation position of the sealing partition 703 on the second end plate 708, the nitrogen-enriched outlet and the oxygen-enriched outlet are respectively located on the second end plate 708 on both sides of the second slot. The first end plate 702 and the second end plate 708 can be directly fixed to the end of the side plate of the housing with screws, or they can be fixed to the side plate of the housing with angle iron and screws; or, to facilitate maintenance by disassembling and assembling the end plates, a snap-locking structure can be used. Through the design of multiple separation chambers arranged in parallel, and the use of an independent end plate design for each separation chamber, the maintenance of the entire device can be made more convenient during actual operation, and isolation and disassembly operations can be performed on individual separation chambers without the need for overall shutdown.

[0036] To avoid weakening the magnetic field strength, the casing and contents of the negative pressure membrane oxygen generator 7 should be made of non-metallic materials. Specifically, the permeable support plate 704 is a thin plate made of a rigid permeable material (e.g., alumina or silicon carbide sintered plate), or a rigid plate (e.g., polysulfone plate) with several through-holes arranged in an array, with each permeable support plate 704 having the same thickness. The sealing partition 703, end plates, side plates, front plates, and bottom plates of the casing are all made of organic materials (e.g., polytetrafluoroethylene plates), with each sealing partition 703 having the same thickness. The oxygen-enriching separation membrane 705 can be a commercially available product, such as a plate membrane structure made of polysulfone, polyimide, or polyphenylene ether membrane materials, with each oxygen-enriching separation membrane 705 having the same thickness. Multiple pins can be used to fix the oxygen-enriching separation membrane 705 to the permeable support plate 704 to achieve the assembly.

[0037] Considering that installing multiple layers of sealing partitions 703, breathable support plates 704, and oxygen-enriched separation membranes 705 in the housing of the negative pressure membrane oxygen generator 7 will cause attenuation of the magnetic field in the middle (the degree of attenuation depends on the total thickness of the various plates and the magnetic circuit parameters), if the housing structure and membrane materials are designed and assembled according to conventional design ideas, the oxygen generation efficiency and oxygen enrichment concentration in the separation chamber located in the middle will be relatively worse, resulting in a decrease in the overall equipment efficiency. If magnetic particles such as neodymium iron boron (NdFeB) are incorporated into the oxygen-enriched separation membrane material, the magnetic field strength in the middle part can be enhanced; however, the enhancement effect depends on the distribution concentration and distribution mode of the magnetic particles in the organic membrane and the characteristics of the matrix material. This not only places more demands on the processing technology of the membrane material itself, leading to increased costs, but more importantly, it is difficult to adjust the parameters of the magnetic particles in the membrane material in a timely manner according to the actual application to meet the requirements of magnetic field balance.

[0038] To address this, our research team proposes a further innovative design: attaching soft magnetic films of varying thicknesses to the breathable support plate 704. The thickness of the soft magnetic film is selected through a gradient variation to achieve magnetic field balance within the cavities of the negative pressure membrane oxygen generator. Specifically, at least two-thirds of the breathable support plates in the middle region of the generator are selected. An oxygen-enriching separation membrane is attached to one side of the plate, and a soft magnetic film is attached to the other side. The soft magnetic film has several interconnected vents arranged in an array. The soft magnetic film on the central breathable support plate has the largest thickness, with the thickness decreasing sequentially on the adjacent plates. This gradient variation in the soft magnetic film thickness achieves magnetic field balance within the cavities of the negative pressure membrane oxygen generator. The rate of change in the soft magnetic film thickness smoothly transitions with an exponential gradient, maintaining magnetic circuit continuity between the first and second superconducting magnets through an appropriate magnetic field enhancement amplitude. In practical applications, technicians can design the arrangement of soft magnetic films according to the following magnetic field balancing strategy: (1) Gradient direction selection, maintaining a radial gradient with a thicker center and thinner edges; (2) Key parameter design, which should include at least the gradient slope and the proportion of soft magnetic films; among them, the thickness change rate determines the magnetic field control amplitude, and it is recommended to use an exponential gradient smooth transition to avoid magnetic circuit discontinuity caused by abrupt changes. The proportion of soft magnetic films refers to the proportion of soft magnetic films arranged in all permeable support plates, which should usually be greater than 40% to avoid insufficient improvement in magnetic permeability. Before specific implementation, numerical simulation and experimental verification can be carried out using finite element analysis (FEA), and the final arrangement scheme can be confirmed based on the verification results.

[0039] The proposed solution in this application, which uses a soft magnetic film to maintain a balanced magnetic field inside the negative pressure membrane oxygen generator 7, perfectly meets the technical requirements of industrial production scenarios. Firstly, soft magnetic films are mature commercial products with various magnetic properties and a wide range of thicknesses available. After determining the layout based on experimental verification results, only different models need to be purchased from the market and simply cut and punched before installation. During installation, multiple pins can be used to fix the oxygen-enriched separation membrane 705, the permeable support plate 704, and the soft magnetic film together to form a sandwich structure. Secondly, the soft magnetic film itself is not a consumable and can be reused. In contrast, the process of incorporating magnetic particles into the oxygen-enriched separation membrane material is complex, and if the membrane material becomes clogged and deteriorates after long-term use, the entire membrane needs to be replaced, resulting in very high overall costs. This is not suitable for industrial oxygen generation needs requiring large ventilation volumes and long-term operation.

[0040] The oxygen-enriched separation membrane 705 gradually becomes clogged after long-term use, leading to a decrease in gas throughput. This application employs a relatively independent separation chamber and end plate design within the negative pressure membrane oxygen generator 7, facilitating maintenance during long-term production operation. Technicians can monitor changes in the pressure, flow rate, and temperature of the oxygen-enriched air within the chamber using a gas state sensor located in the negative pressure chamber. If the set requirements are not met, the valves on the corresponding branch pipes before and after the separation chamber can be closed to isolate it. Then, the end plate is disassembled, the composite plate component is removed, and the oxygen-enriched separation membrane 705 on the separation surface is replaced. The permeable support plate 704 and the soft magnetic film (if any) can be reused. Therefore, the entire device is easy to maintain and has a very low overall cost. Maintenance does not require a complete shutdown, perfectly meeting the needs of continuous industrial production.

[0041] An application example:

[0042] like Figure 1As shown, the negative pressure membrane oxygen-enriching system uses a storage power box to provide DC power. The first superconducting magnet 5 and the second superconducting magnet 6 are arranged parallel to each other at the upper and lower ends of the negative pressure membrane oxygen generator 7, forming magnetic field lines pointing from the second superconducting magnet 6 to the first superconducting magnet 5. The permeable support plates 704 in each separation chamber are kept inclined in the same direction and arranged parallel to each other. A hole is opened on the first end plate 702 as an air inlet, and two holes are opened alternately on the second end plate 708, serving as nitrogen-enriched outlet and oxygen-enriched outlet respectively. One end of the permeable support plate 704 is close to the upper sealing partition 703, and the other end is located between the nitrogen-enriched outlet and the oxygen-enriched outlet, with a height difference of 25-30 cm between the two ends. This inclined design optimizes the airflow path, increases the contact time between the gas and the oxygen-enriched separation membrane 705, enhances the interaction opportunity between air and the membrane material, and improves oxygen permeation efficiency. With the assistance of the vacuum pump 9, the pressure in the negative pressure chamber is always lower than that in the inlet chamber, thus maintaining stable gas permeation capacity. After the separated oxygen-enriched gas is drawn into the oxygen-enriched gas storage tank 10, the water vapor it contains naturally settles and accumulates at the bottom of the tank, and is then transferred to the water storage tank 13 through the drainage pipeline. Using the gas state sensor on the finished oxygen-enriched pipeline at the top of the tank, the pressure, flow rate, and temperature of the oxygen-enriched air can be monitored in real time to ensure that the gas product meets the needs of industrial production.

[0043] In this invention, the air filter 1 is mainly used to remove moisture and impurities from the air, and mature technology can be used; the ventilator 2 is preferably a centrifugal ventilator; the vacuum pump 9 is a dry vacuum pump, specifically, it can be any one of a vortex vacuum pump, screw vacuum pump, Roots vacuum pump or magnetic levitation centrifugal vacuum pump.

[0044] Part Two: Instructions for Device Operation

[0045] Start the ventilator 2 to allow air to pass through the air filter 1 for water and dust filtration. After filtration, the filtered air flows to the ventilator 2 as raw material air. In the ventilator 2, the raw material air is lifted to a low pressure state to overcome the resistance in the pipeline, and then flows into the negative pressure membrane oxygen generator 7.

[0046] In the negative pressure membrane oxygen generator 7, raw air flows into the air inlet chamber through the air inlet in the middle of the first end plate 902. Then, the vacuum pump 9 is started, creating a negative pressure on the permeate side of the membrane structure 705 by pumping air. Due to its permeability selectivity, oxygen molecules can quickly pass through the oxygen-enriched separation membrane 705 under negative pressure and accumulate in the negative pressure chamber to become oxygen-enriched gas. Simultaneously, nitrogen and other impurities are blocked in the air inlet chamber and discharged into the atmosphere through the nitrogen-enriched outlet due to the slight positive pressure created by the fan 2, without accumulating in the air inlet chamber. As an example, an oxygen generator can be constructed using a ZOE01-5 type negative pressure membrane oxygen generator (with other appropriately selected auxiliary equipment) in the aforementioned manner, producing an oxygen flow rate of 60 m³ / h. 3 / h, oxygen-enriched gas with a concentration of 29%.

[0047] Simultaneously, the energy storage box 3 provides direct current to the first superconducting magnet 5 and the second superconducting magnet 6 via wire 4, forming a magnetic field of approximately 3T between the two magnets. Because oxygen molecules are paramagnetic, under the influence of the magnetic field, their motion changes due to the magnetic force, making them more likely to aggregate and move directionally along the magnetic field. Nitrogen molecules, on the other hand, are diamagnetic and less affected by the magnetic field. This differentiation in the motion behavior of oxygen and nitrogen molecules in the magnetic field environment is beneficial for improving the separation effect of oxygen and nitrogen. As a specific example, in a 3T magnetic field, after the raw air passes through the oxygen-enriched separation membrane 705, the concentration of oxygen-enriched gas can be increased to 32-35%, and the gas volume to 70-80 m³, compared to when no magnetic separation is used. 3 / h; changed to a magnetic field of 1T strength, the oxygen-enriched gas concentration can be increased to about 31%, and the gas volume can be increased to 65m³. 3 / h or so.

[0048] The oxygen-enriched gas produced in the negative pressure membrane oxygen generator 7 is pumped to the oxygen-enriched gas storage tank 10 by the vacuum pump 9. The water vapor molecules contained in the oxygen-enriched gas are separated from the oxygen-enriched gas by natural sedimentation and discharged from their respective pipelines to achieve water vapor separation and external supply.

[0049] The specific embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above, and those skilled in the art can make various modifications or variations within the scope of the claims, which do not affect the substantive content of this utility model.

Claims

1. A negative pressure membrane oxygen enrichment system with magnetic separation, characterized in that, The system includes an air filter, a ventilator, and a negative pressure membrane oxygen generator connected in sequence through an air intake pipe, as well as a first superconducting magnet and a second superconducting magnet connected in parallel to a DC power supply through wires; wherein, the main body of the negative pressure membrane oxygen generator is a box structure, and the first and second superconducting magnets are arranged in parallel on both sides of the box, and the magnetic lines of force between them run through the entire negative pressure membrane oxygen generator in one direction. The negative pressure membrane oxygen generator has multiple parallel and alternating sealing partitions inside the housing, dividing the interior into multiple sequentially arranged separation chambers. Each separation chamber has an inclined ventilated support plate, which separates the separation chamber into an independent air inlet chamber and a negative pressure chamber. An oxygen-enriched separation membrane is provided on the surface of the ventilated support plate. One end of the ventilated support plate is connected to the non-edge position of the outlet side end plate. A nitrogen-enriched outlet connecting to the air inlet chamber and an oxygen-enriched outlet connecting to the negative pressure chamber are provided on this side end plate. An air inlet is provided on the opposite side end plate. The air inlet is connected to the air inlet pipe through a branch pipe, the nitrogen-enriched outlet is connected to the exhaust pipe, and the oxygen-enriched outlet is connected to the vacuum pump through an oxygen-enriched gas collection pipe.

2. The negative pressure membrane oxygen enrichment system with magnetic separation according to claim 1, characterized in that, The breathable support plate is a thin plate made of rigid breathable material, or a rigid plate with several through-holes arranged in an array.

3. The negative pressure membrane oxygen enrichment system with magnetic separation according to claim 1, characterized in that, Select at least 2 / 3 of the breathable support plates to be arranged in the middle area, attach an oxygen-enriched separation membrane to one side surface and attach a soft magnetic film to the other side surface. The soft magnetic film has several through-holes arranged in an array.

4. The negative pressure membrane oxygen enrichment system with magnetic separation according to claim 3, characterized in that, The soft magnetic film located on the central breathable support plate has the largest thickness, and the thickness of the soft magnetic films arranged on the breathable support plates on both sides decreases sequentially; through the gradient change in the thickness of the soft magnetic films, the magnetic field balance in each cavity inside the negative pressure membrane oxygen generator is achieved.

5. The negative pressure membrane oxygen enrichment system with magnetic separation according to claim 4, characterized in that, Each sealing partition has the same thickness, each breathable support plate has the same thickness, and each oxygen-enriched separation membrane has the same thickness; the thickness change rate of the soft magnetic film transitions smoothly with an exponential gradient, and the magnetic circuit continuity between the first superconducting magnet and the second superconducting magnet is maintained by an appropriate magnetic field enhancement amplitude.

6. The negative pressure membrane oxygen enrichment system with magnetic separation according to any one of claims 1 to 5, characterized in that, The box structure of the negative pressure membrane oxygen generator includes parallel side plates; at the air inlet and exhaust ends of the box, there are several sets of parallel first end plates and second end plates; the first end plates and second end plates in the same set, together with the side plates and sealing partitions, form a separation chamber; adjacent separation chambers share a sealing partition, and the outermost separation chamber uses the top plate or bottom plate of the box as the sealing partition.

7. The negative pressure membrane oxygen enrichment system with magnetic separation according to claim 6, characterized in that, The first end plate and the second end plate are respectively fixedly installed at both ends of the side plate of the box; on the inner surface of the first end plate and the second end plate, a first slot and a second slot for inserting the ventilated support plate are respectively provided, and the two slots are parallel to each other; wherein, the first slot is located close to the sealing partition, and the second slot is staggered from the first slot, and the nitrogen-enriched outlet and the oxygen-enriched outlet are located on the second end plate on both sides of the second slot.

8. The negative pressure membrane oxygen enrichment system with magnetic separation according to any one of claims 1 to 5, characterized in that, The exhaust pipe leads to the atmosphere, and the outlet of the vacuum pump is connected to the oxygen enrichment module through a pipeline. The oxygen enrichment module includes an oxygen enrichment storage tank, with the top connected to the finished oxygen enrichment pipeline, and the bottom connected to the maintenance valve, the drain valve and the water storage tank in sequence through a drain pipeline. A gas state sensor for monitoring the pressure, flow rate and temperature of the oxygen enriched air is also installed on the finished oxygen enrichment pipeline.

9. The negative pressure membrane oxygen enrichment system with magnetic separation according to any one of claims 1 to 5, characterized in that, Each negative pressure chamber is equipped with a gas state sensor for monitoring the pressure, flow rate, and temperature of oxygen-enriched air.

10. The negative pressure membrane oxygen enrichment system with magnetic separation according to any one of claims 1 to 5, characterized in that, The oxygen-enriched separation membrane is a plate-type membrane structure made of membrane material of any one of polysulfone, polyimide or polyphenylene ether.

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