An oxygen-enriched membrane module and a membrane-based oxygen-enriched production system

Abstract

The present invention discloses an oxygen-enriched membrane assembly and a membrane-based oxygen-enriched production system, and relates to the technical field of membrane-based oxygen-enriched production equipment, wherein an oxygen-enriched membrane assembly comprises a box body, an oxygen-enriched membrane is arranged in the box body, and the inside of the box body is divided by the oxygen-enriched membrane to form a raw gas channel and an oxygen-enriched gas channel, and the cross-section of the raw gas channel along the raw gas flow direction tends to gradually increase. Compared with the traditional oxygen-enriched module in which the cross-section of the raw gas channel along the raw gas flow direction remains unchanged, the oxygen-enriched membrane assembly in the present invention can ensure the uniformity of the pressure difference on both sides of the oxygen-enriched membrane during the flow process, effectively improve the uniformity of air separation of the oxygen-enriched membrane assembly, and thereby ensure that the enriched gas concentration has better stability and the overall controllability of the oxygen enrichment rate.

Description

Technical Field

[0001] The invention relates to the technical field of membrane-based oxygen-enriched production equipment, and in particular to an oxygen-enriched membrane component and a membrane-based oxygen-enriched production system. Background Art

[0002] Oxygen-enriched combustion is the combustion of oxygen-containing gas with an oxygen content higher than that of air (20.947%). It is a highly efficient and energy-saving combustion technology that has the advantages of increasing flame temperature, enhancing radiation heat transfer capacity, reducing exhaust emissions, improving thermal efficiency, and saving energy. It is beneficial to increasing product output and quality. In the cement, boiler, ceramic, glass and other industries, high-efficiency technology based on oxygen-enriched combustion is being continuously promoted and applied.

[0003] At present, the production process of oxygen enrichment mainly involves traditional cryogenic air separation, pressure swing adsorption (PSA), vacuum pressure swing adsorption (VPSA) and membrane methods. In actual application, for small-scale users, such as oxygen-enriched combustion in ceramic kilns and glass kilns, the production process of oxygen enrichment is mostly based on membrane separation membrane oxygen enrichment process. However, the traditional oxygen enrichment membrane components used in the existing membrane oxygen enrichment process, whether plate membrane or roll membrane, are like Figure 3 As shown, it includes a box body 1, in which an oxygen-enriched membrane 4 is arranged, and the oxygen-enriched membrane 4 is arranged parallel to the upper and lower walls of the box body 1 to form a raw gas channel 2 and an oxygen-enriched gas channel 3, and the cross-sections of the raw gas channel 2 and the oxygen-enriched gas channel 3 remain unchanged. According to the Bernoulli principle of fluid mechanics, when the raw gas flows in the raw gas channel 2, there is a certain difference between the static pressure at the inlet end and the static pressure at the end due to flow loss. This difference directly leads to the uneven osmotic pressure difference on both sides of the surface of the oxygen-enriched membrane 4 from the inlet end to the outlet end of the oxygen-enriched membrane 4, and the osmotic pressure difference at the inlet end is greater than the osmotic pressure difference at the outlet end. This uneven osmotic pressure difference leads to changes in the actual enriched gas concentration and the concentration of the remaining gas components. At the same time, the membrane enrichment method actually has an essential dependence on this osmotic pressure difference, and this unevenness will gradually worsen with the operation of the membrane assembly. For example, the oxygen-enriched membrane 4 itself may be contaminated by particulate pollutants in the raw gas, and the effective pore size may be gradually blocked locally, further aggravating the unevenness of the osmotic pressure difference, which is not conducive to the smooth progress and effective control of membrane oxygen enrichment. Summary of the invention

[0004] 1. Technical problem to be solved by the invention

[0005] In view of the technical problem of uneven pressure on both sides of the oxygen-enriched membrane in the traditional oxygen-enriched membrane assembly, the present invention provides an oxygen-enriched membrane assembly and a membrane-based oxygen-enriched production system, which can not only ensure the uniform distribution of pressure on both sides of the membrane assembly, but also effectively control the oxygen enrichment rate and ensure the stability of the oxygen-enriched gas concentration.

[0006] 2. Technical solution

[0007] To solve the above problems, the technical solution provided by the present invention is:

[0008] An oxygen-enriched membrane assembly comprises a box body, wherein an oxygen-enriched membrane is arranged in the box body, wherein the interior of the box body is divided by the oxygen-enriched membrane into a raw gas channel and an oxygen-enriched gas channel, wherein the cross section of the raw gas channel tends to gradually increase along the raw gas flow direction.

[0009] In the present invention, the cross-section of the raw gas channel along the flow direction of the raw gas tends to gradually increase. This setting makes it so that when the raw gas flows in the raw gas channel, as the cross-sectional area of ​​the raw gas channel increases, the flow velocity of the corresponding cross section must decrease year-on-year according to the continuity principle. However, due to the increase in cross-sectional area, the flow velocity decreases. According to the basic principle of the Bernoulli equation of fluid mechanics, as the velocity is actively controlled, the flow velocity decreases, and the kinetic energy of gas flow is converted into static pressure; at the same time, the cross-section of the oxygen-enriched gas channel passing through the oxygen-enriched membrane along the flow direction will inevitably change, that is, the flow velocity of the oxygen-enriched gas will change during the flow process. Considering the resistance loss of the flow itself, the pressure difference on both sides of the oxygen-enriched membrane in the present invention can be well controlled. During the whole process, the uniformity of the osmotic pressure difference of the oxygen-enriched membrane is greatly improved, which is conducive to the uniform production of enriched gas. From the perspective of fluid mechanics theory, the characteristics of the oxygen-enriched membrane in the present invention are well guaranteed by the flow boundary. It can be seen that, compared with the traditional oxygen-enriched module assembly in which the cross-section of the raw gas channel remains unchanged along the flow direction of the raw gas, the oxygen-enriched membrane assembly in the present invention can ensure the uniformity of the pressure difference on both sides of the oxygen-enriched membrane during the flow process, effectively improve the uniformity of air separation of the oxygen-enriched membrane assembly, and thus ensure that the enriched gas concentration has better stability and the overall controllability of the oxygen enrichment rate.

[0010] Optionally, the oxygen-enriched membrane is tiltedly arranged on the box body, and an angle α between the oxygen-enriched membrane and a center line of the box body is 7-12 degrees.

[0011] Optionally, the oxygen-enriched membrane is horizontally arranged in the box, and the angle α between the long side of the box and the horizontal line along the flow direction of the raw gas is 7-12 degrees.

[0012] Optionally, the box body is provided with an air inlet, a first air outlet and a second air outlet, the air inlet and the first air outlet are both communicated with the raw gas channel, and the second air outlet is communicated with the oxygen-enriched gas channel.

[0013] Optionally, the air inlet and the second air outlet are arranged at one end of the box body, and the first air outlet is arranged at the other end of the box body.

[0014] Optionally, the air inlet is arranged at one end of the box body, and the first air outlet and the second air outlet are arranged at the other end of the box body.

[0015] At the same time, the present invention also provides a membrane oxygen-enriched production system, comprising: a filter, a blower, a vacuum pump and the above-mentioned oxygen-enriched membrane assembly; one end of the blower is connected to the filter through a pipeline, the other end of the blower is connected to the box through a pipeline, and the vacuum pump is connected to the box through a pipeline.

[0016] Optionally, an oxygen-rich storage device is also included, and the oxygen-rich storage device is connected to the vacuum pump through a pipeline.

[0017] Optionally, a median differential pressure gauge is also included, and the median differential pressure gauge is arranged on the box body.

[0018] Optionally, a control system is also included, which is connected to the blower, vacuum pump and median pressure differential gauge respectively.

[0019] 3. Beneficial effects

[0020] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0021] (1) The oxygen-enriched membrane assembly proposed in the embodiment of the present application has a simple structure. Compared with the traditional oxygen-enriched module in which the cross-section of the raw gas channel remains unchanged along the flow direction of the raw gas, the oxygen-enriched membrane assembly in the present application can ensure the uniformity of the pressure difference on both sides of the oxygen-enriched membrane during the flow process, effectively improve the uniformity of air separation of the oxygen-enriched membrane assembly, and thus ensure that the enriched gas concentration has better stability and the overall controllability of the oxygen enrichment rate.

[0022] (2) The oxygen-enriched membrane assembly proposed in the embodiment of the present application sets the angle α between the oxygen-enriched membrane and the center line of the box to 7-12 degrees, so that the cross-section of the raw gas channel along the raw gas flow direction tends to gradually increase, thereby ensuring the uniformity of the pressure difference on both sides of the oxygen-enriched membrane during the flow process, improving the uniformity of air separation of the oxygen-enriched membrane assembly, and further ensuring better stability of the enriched gas concentration and overall controllability of the oxygen enrichment rate.

[0023] (3) The oxygen-enriched membrane assembly proposed in the embodiment of the present application is arranged so that the oxygen-enriched membrane is horizontally arranged in the box body, and the angle α between the long side of the box body and the horizontal line along the flow direction of the raw gas is 7-12 degrees, so that the cross-section of the raw gas channel along the flow direction of the raw gas tends to gradually increase, thereby ensuring the uniformity of the pressure difference on both sides of the oxygen-enriched membrane during the flow process, improving the uniformity of air separation of the oxygen-enriched membrane assembly, and further ensuring better stability of the enriched gas concentration and overall controllability of the oxygen enrichment rate.

[0024] (4) The oxygen-enriched membrane assembly proposed in the embodiment of the present application has the air inlet and the second air outlet arranged at one end of the box body, and the first air outlet arranged at the other end of the box body, so that the flow direction of the raw gas in the raw gas channel is opposite to the flow direction of the oxygen-enriched gas in the oxygen-enriched gas channel.

[0025] (5) The oxygen-enriched membrane assembly proposed in the embodiment of the present application has the air inlet arranged at one end of the box body, and the first air outlet and the second air outlet arranged at the other end of the box body, so that the flow direction of the raw gas in the raw gas channel is the same as the flow direction of the oxygen-enriched gas in the oxygen-enriched gas channel.

[0026] (6) The membrane-based oxygen-enriched production system proposed in the embodiment of the present application, when working, the raw gas enters the filter for filtration under the action of the blower, removes the dust, large particles, gaseous water and other impurities in the raw gas, and then enters the box in the oxygen-enriched membrane assembly. The oxygen with a fast permeation rate passes through the oxygen-enriched membrane and passes through the oxygen-enriched oxygen channel. Under the action of the vacuum pump, the oxygen-enriched air in the oxygen-enriched oxygen channel is collected through the pipeline for use, while the nitrogen with a slow permeation rate does not pass through the oxygen-enriched membrane and is retained and discharged from one end of the raw gas channel. The membrane-based oxygen-enriched production system of the present application is not only simple in structure, but also can ensure the uniformity of the pressure difference on both sides of the oxygen-enriched membrane during the flow process, improve the uniformity of air separation of the oxygen-enriched membrane assembly, and thus ensure better stability of the enriched gas concentration and overall controllability of the oxygen enrichment rate.

[0027] (7) The membrane-based oxygen-enriched production system proposed in the embodiment of the present application obtains the value of the static pressure difference at the flow channels on both sides of the oxygen-enriched membrane in the middle of the flow direction in the box of the oxygen-enriched membrane module by setting a mid-point differential pressure gauge. This value can be used as a control parameter for the operation of the variable frequency blower and the variable frequency vacuum pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic structural diagram of an oxygen-enriched membrane assembly proposed in an embodiment of the present invention.

[0029] Figure 2 This is a schematic structural diagram of an oxygen-enriched membrane assembly proposed in an embodiment of the present invention.

[0030] Figure 3 This is a schematic structural diagram of a traditional oxygen-enriched membrane module proposed in an embodiment of the present invention.

[0031] Figure 4 This is a schematic structural diagram of a membrane oxygen-enriched production system proposed in an embodiment of the present invention.

[0032] Figure 5 This is a schematic structural diagram of a membrane oxygen-enriched production system proposed in an embodiment of the present invention. DETAILED DESCRIPTION

[0033] In order to further understand the content of the present invention, the present invention is described in detail in conjunction with the accompanying drawings and embodiments.

[0034] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are only used to explain the relevant inventions, rather than to limit the invention. It should also be noted that, for the convenience of description, only the parts related to the invention are shown in the accompanying drawings. The words "first", "second", etc. described in the present invention are set for the convenience of describing the technical solution of the present invention, and have no specific limiting effect. They are all general references and do not constitute a limiting effect on the technical solution of the present invention. It should be noted that, in the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. In the description of the present invention, it should be noted that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral 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, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Example 1

[0036] Combined with Figure 1-2 This embodiment provides an oxygen-enriched membrane assembly, including a box body 1, in which an oxygen-enriched membrane 4 is arranged, and the interior of the box body 1 is divided by the oxygen-enriched membrane 4 to form a raw gas channel 2 and an oxygen-enriched gas channel 3, and the cross-section of the raw gas channel 2 tends to gradually increase along the raw gas flow direction.

[0037] In the present application, the cross section of the raw gas channel 2 along the flow direction of the raw gas shows a trend of gradually increasing. This setting makes it so that when the raw gas flows in the raw gas channel, as the cross-sectional area of ​​the raw gas channel 2 increases, the flow velocity of the corresponding cross section must decrease year-on-year according to the continuity principle. However, due to the increase in cross-sectional area, the flow velocity decreases. According to the basic principle of the Bernoulli equation of fluid mechanics, as the velocity is actively controlled, the flow velocity decreases, and the kinetic energy of gas flow is converted into static pressure; at the same time, the cross section of the oxygen-enriched gas channel passing through the oxygen-enriched membrane 4 along the flow direction will inevitably change, that is, the flow velocity of the oxygen-enriched gas will change during the flow process. Considering the resistance loss of the flow itself, the pressure difference on both sides of the oxygen-enriched membrane 4 in the present application can be well controlled. During the whole process, the uniformity of the osmotic pressure difference of the oxygen-enriched membrane 4 is greatly improved, which is conducive to the uniform production of enriched gas. From the perspective of fluid mechanics theory, the characteristics of the oxygen-enriched membrane 4 in the present application are well guaranteed by the flow boundary. It can be seen that compared with the traditional oxygen-enriched module assembly in which the cross-section of the raw gas channel 2 remains unchanged along the flow direction of the raw gas, the oxygen-enriched membrane assembly in the present application can ensure the uniformity of the pressure difference on both sides of the oxygen-enriched membrane 4 during the flow process, effectively improve the uniformity of air separation of the oxygen-enriched membrane assembly, and thus ensure that the enriched gas concentration has better stability and the overall controllability of the oxygen enrichment rate.

[0038] Example 2

[0039] Combined with Figure 1 , the oxygen-enriched membrane assembly of this embodiment is compared with the technical solution of embodiment 1, the oxygen-enriched membrane 4 is tilted on the box body 1, and the angle α between the oxygen-enriched membrane 4 and the center line of the box body 1 is 7-12 degrees. In actual use, the box body 1 is a rectangular box body 1, and this arrangement makes the cross-section of the raw gas channel 2 along the flow direction of the raw gas gradually increase. When the raw gas flows in the raw material channel, as the cross-sectional area of ​​the raw gas channel 2 increases, the flow velocity of the corresponding cross section must decrease year-on-year according to the principle of continuity. This is because the cross-sectional area increases and the flow velocity decreases. According to the basic principle of the Bernoulli equation of fluid mechanics, with the active control of the velocity, the flow velocity decreases, and the kinetic energy of the gas flow is converted into static pressure; at the same time, the cross-section of the oxygen-enriched gas channel passing through the oxygen-enriched membrane 4 is gradually expanded along the flow direction, and the dynamic pressure is also converted into static pressure. Considering the inherent resistance loss of the flow, the pressure difference on both sides of the oxygen-enriched membrane 4 is well controlled. During the whole process, the uniformity of the osmotic pressure difference is greatly improved, which is conducive to the uniform production of enriched gas. From the perspective of fluid mechanics theory, the characteristics of the oxygen-enriched membrane 4 are well guaranteed by the flow boundary. It can be seen that the setting of the angle can ensure the uniformity of the pressure difference on both sides of the oxygen-enriched membrane 4 during the flow process, effectively improve the uniformity of air separation of the oxygen-enriched membrane module, and thus ensure that the enriched gas concentration has better stability and the overall controllability of the oxygen enrichment rate.

[0040] Example 3

[0041] Combined with Figure 2 Compared with the technical solution of Example 1, the oxygen-enriched membrane assembly of this embodiment has the oxygen-enriched membrane 4 arranged horizontally in the box body 1, and the angle α between the long side of the box body 1 and the horizontal line along the flow direction of the raw gas is 7-12 degrees.

[0042] In actual use, the box body 1 is a diamond-shaped box body 1. This setting makes the cross-section of the raw gas channel 2 along the flow direction of the raw gas gradually increase. When the raw gas is input into the raw gas channel 2 and flows, the speed of the raw gas at the inlet end is higher, and the speed at the outlet end is relatively low. While considering the local resistance, there is still an organic transformation from dynamic pressure to static pressure at the outlet end; at the same time, the oxygen-rich gas in the oxygen-rich gas channel has a relatively slow speed at the inlet end of the raw gas, and a relatively fast flow rate at the outlet end. The geometric shape of the oxygen-rich gas channel changes. The above setting still ensures the uniformity of the pressure difference on both sides of the semipermeable membrane during the flow process, thereby ensuring that the concentration of the oxygen-rich gas is better under the corresponding pressure difference.

[0043] Example 4

[0044] Combined with Figure 4-5 Compared with the technical solution of Example 1, the oxygen-enriched membrane assembly of this embodiment has an air inlet 5, a first air outlet 6 and a second air outlet 7 on the housing 1. The air inlet 5 and the first air outlet 6 are both in communication with the raw gas channel 2, and the second air outlet 7 is in communication with the oxygen-enriched gas channel 3. The raw gas enters the raw gas channel 2 of the housing 1 through the air inlet 5 and flows. During the flow, the gas entering the oxygen-enriched gas channel 3 through the oxygen-enriched membrane 4 is enriched and discharged from the second air outlet 7, while the remaining gas that has not passed through the oxygen-enriched membrane 4 is discharged through the first air outlet 6.

[0045] Example 5

[0046] Combined with Figure 4 Compared with the technical solution of Example 4, the oxygen-enriched membrane assembly of this embodiment has the air inlet 5 and the second air outlet 7 disposed at one end of the housing 1, and the first air outlet 6 disposed at the other end of the housing 1. This arrangement makes the flow direction of the raw gas in the raw gas channel 2 opposite to the flow direction of the oxygen-enriched gas in the oxygen-enriched gas channel 3.

[0047] Example 6

[0048] Combined with Figure 5Compared with the technical solution of Example 4, the oxygen-enriched membrane assembly of this embodiment has the following features: the air inlet 5 is provided at one end of the housing 1, and the first air outlet 6 and the second air outlet 7 are provided at the other end of the housing 1. This arrangement makes the flow direction of the raw gas in the raw gas channel 2 the same as the flow direction of the oxygen-enriched gas in the oxygen-enriched gas channel 3.

[0049] Example 7

[0050] Combined with Figure 4-5 This embodiment provides a membrane oxygen-enriched production system, which, compared with any one of the technical solutions in Examples 1-6, comprises: a filter 8, a blower 9, a vacuum pump 12 and the oxygen-enriched membrane assembly described in any one of the technical solutions in Examples 1-6; one end of the blower 9 is connected to the filter 8 through a pipeline, the other end of the blower 9 is connected to the box 1 through a pipeline, and the vacuum pump 12 is connected to the box 1 through a pipeline.

[0051] During operation, the raw gas enters the filter 8 for filtration under the action of the blower 9. After removing dust, large particles, gaseous water and other impurities in the raw gas, it enters the box 1 in the oxygen-enriched membrane assembly. The oxygen with a fast permeation rate passes through the oxygen-enriched membrane 4 and passes through the oxygen-enriched oxygen channel 3. Under the action of the vacuum pump 12, the oxygen-enriched air in the oxygen-enriched oxygen channel 3 is collected through a pipeline for use, while the nitrogen with a slow permeation rate does not pass through the oxygen-enriched membrane 4 and is retained and discharged from one end of the raw gas channel 2. The membrane oxygen-enriched production system of the present application is not only simple in structure, but also can ensure the uniformity of the pressure difference on both sides of the oxygen-enriched membrane 4 during the flow process, effectively improve the uniformity of air separation of the oxygen-enriched membrane assembly, and thus ensure better stability of the enriched gas concentration and overall controllability of the oxygen enrichment rate.

[0052] In actual use, a first valve 10 is provided on the pipeline between the box body 1 and the blower 9, and the first valve 10 can be used to control the speed and amount of gas entering the box body 1; a second valve 11 is provided on the pipeline between the box body 1 and the vacuum pump 12, and the second valve 11 is set to effectively control the discharge speed of the oxygen-rich gas.

[0053] In actual use, one end of the blower 9 is connected to the filter 8 through a pipeline, the other end of the blower 9 is connected to the raw gas channel 2 in the box 1 through a pipeline, and the vacuum pump 12 is connected to the oxygen-enriched gas channel 3 of the box 1 through a pipeline.

[0054] Example 8

[0055] Compared with the technical solution of Example 7, the membrane oxygen-enriched production system of this embodiment further includes an oxygen-enriched storage device, which is connected to the vacuum pump 12 through a pipeline. The oxygen-enriched storage device (not shown in the figure) is used to collect the enriched oxygen.

[0056] Example 9

[0057] Combined with Figure 4-5 Compared with the technical solution of Example 7, the membrane oxygen-enriched production system of this embodiment further includes a median pressure differential gauge 13, and the median pressure differential gauge 13 is arranged on the box body 1.

[0058] In actual use, the blower 9 is a variable frequency blower, and the vacuum pump 12 is a variable frequency vacuum pump. By setting a median differential pressure gauge, the static pressure difference at the flow channels on both sides of the oxygen-enriched membrane 4 in the middle of the flow direction in the box 1 of the oxygen-enriched membrane assembly is obtained. This value can be used as a control parameter for the operation of the variable frequency blower and the variable frequency vacuum pump. Usually, for an enrichment process corresponding to a certain concentration requirement, the enriched gas flow rate Q and the sum of the power consumption N9 and N11 corresponding to the variable frequency blower and the variable frequency vacuum pump are collected under the premise of constant pressure difference (the specific constant value is directly related to the actual requirements). From the perspective of conservation of energy, conservation of momentum and continuity law of fluid flow, the control algorithm based on the measurement of the median pressure difference in the flow channel has a second-order control accuracy as a whole, which is conducive to the stable and smooth operation of the membrane oxygen enrichment process.

[0059] Example 10

[0060] Compared with the technical solution of Example 9, the membrane method oxygen-enriched production system of this embodiment further includes a control system, which is respectively connected to the blower 9, the vacuum pump 12 and the median differential pressure gauge 13. By setting the control system, the control system controls the operating parameters of the blower 9 and the vacuum pump 12 according to the detection value of the median differential pressure gauge, thereby realizing the automation of the entire membrane method oxygen-enriched production system.

[0061] The present invention and its embodiments are described schematically above, and the description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by it and designs a structural method and an embodiment similar to the technical solution without creativity without departing from the purpose of the invention, they shall all fall within the protection scope of the present invention.

Claims

1. An oxygen-enriched membrane module, characterized in that: It comprises a box body, wherein an oxygen-enriched membrane is arranged in the box body, and the inside of the box body is divided by the oxygen-enriched membrane into a raw gas channel and an oxygen-enriched gas channel, and the cross section of the raw gas channel tends to gradually increase along the raw gas flow direction; The oxygen-enriched membrane is tilted on the box, and the angle α between the oxygen-enriched membrane and the center line of the box is 7-12 degrees; or, the oxygen-enriched membrane is horizontally arranged in the box, and the angle α between the long side of the box and the horizontal line along the flow direction of the raw gas is 7-12 degrees; The box body is provided with an air inlet, a first air outlet and a second air outlet. The air inlet and the first air outlet are both communicated with the raw gas channel, and the second air outlet is communicated with the oxygen-enriched gas channel.

2. The oxygen-enriched membrane module according to claim 1, characterized in that: The air inlet and the second air outlet are arranged at one end of the box body, and the first air outlet is arranged at the other end of the box body.

3. The oxygen-enriched membrane module according to claim 1, characterized in that: The air inlet is arranged at one end of the box body, and the first air outlet and the second air outlet are arranged at the other end of the box body.

4. A membrane oxygen enrichment system, characterized in that: include: A filter, a blower, a vacuum pump and an oxygen-enriched membrane assembly according to any one of claims 1 to 3; One end of the blower is connected to the filter through a pipeline, the other end of the blower is connected to the box through a pipeline, and the vacuum pump is connected to the box through a pipeline.

5. The membrane oxygen enrichment system according to claim 4, characterized in that: The device also comprises an oxygen-rich storage device, which is connected to the vacuum pump through a pipeline.

6. The membrane oxygen enrichment system according to claim 4, characterized in that: It also includes a median differential pressure gauge, which is arranged on the box body.

7. The membrane oxygen enrichment system according to claim 6, characterized in that: It also includes a control system, which is connected to the blower, the vacuum pump and the mid-pressure differential gauge respectively.

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