A membrane separation device

Abstract

The utility model discloses a membrane separation device belongs to membrane separation technical field, this membrane separation device, including first device, the gas inlet pipe is connected with the purification mechanism between second device, the first exhaust port is connected with the filter mechanism between third device, the gas pipe two flow channel diameter gradually enlargies along with gas flow direction, the gas pipe two are connected with the guide mechanism in. The utility model discloses through the purification mechanism and realizes gas circulation and secondary purification, utilizes the gradually expanding flow channel cooperation to guide the formation helical airflow of inclined baffle, forces the fresh membrane surface sustained contact of not separating component, effectively eliminates flow dead zone and inhibits vortex formation, significantly reduces the interstage backmixing phenomenon, through the filter mechanism realizes the deep processing and recycling of waste gas, adopts the gradually expanding flow channel to combine the baffle guide design, makes residual target component reenter separation cycle, avoids the interstage interference caused by waste gas direct discharge under high pressure difference condition simultaneously, maintains each membrane module entrance concentration gradient stability.

Description

Technical Field

[0001] This utility model relates to the field of membrane separation technology, and in particular to a membrane separation device. Background Technology

[0002] Membrane separation devices utilize the selective permeability of membranes to separate, purify, or concentrate materials through pressure differences and other driving forces. They are widely used in food, environmental protection, chemical and other fields.

[0003] In the field of membrane separation technology, efficient gas separation and purification are typically achieved through membrane modules. However, the design of the connecting channels between membrane modules in existing technologies has certain defects. Traditional designs often use right-angle bends or simple pipes for inter-stage connections. This structure has inherent deficiencies in terms of fluid dynamics: when the mixed gas flows through the right-angle turning area, due to the abrupt change in the channel cross-section and the sharp change in flow direction, a low-speed zone or even a stagnant zone, i.e., a flow dead zone, is easily formed inside the bend. The reduced gas velocity in this area weakens the mass transfer driving force on the separation membrane surface. Incompletely separated gas components are trapped in the dead zone and form eddies, and some gas is entrained into the next stage membrane module without sufficient separation. This non-ideal flow state directly causes coupling interference between the separation functions of the two-stage membrane modules, which not only prevents the separation efficiency of a single-stage membrane module from being fully utilized, but also reduces the overall gas recovery rate of the system due to the aggravated backmixing phenomenon between stages. Engineering practice shows that such design defects are particularly prominent under high pressure differential and high viscosity gas separation conditions, becoming a key technical bottleneck restricting the performance improvement of membrane separation devices.

[0004] Therefore, there is an urgent need to provide a membrane separation device to solve the above problems. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a membrane separation device.

[0006] To solve the above-mentioned technical problems, the present invention adopts a technical solution as follows: a membrane separation device is provided, including a first device, a second device and a third device, and multiple air pipes are connected between them. A first air inlet is installed on the top of the first device, and an air inlet pipe is connected to the top of the first air inlet. Two baffles are fixedly connected inside the air inlet pipe. A purification mechanism is connected between the air inlet pipe and the second device, and the purification mechanism is used to circulate gas. A first exhaust port is installed on one side of the first device, and a filter mechanism is connected between the first exhaust port and the third device. The filter mechanism is used to purify the exhaust gas. The diameter of the second air duct gradually increases with the direction of gas flow. A guiding mechanism is connected inside the second air duct to guide the gas to form laminar flow and reduce turbulence.

[0007] The present invention is further configured such that: the purification mechanism includes a first air outlet installed on the top of the first device, a second air inlet installed on the top of the second device, the first air outlet and the second air inlet being connected through a second air pipe, the second air outlet being used to discharge the purified gas, a second exhaust port being installed on one side of the second device, the second exhaust port being connected to the air inlet pipe through a second air pipe, one end of the second air pipe located inside the air inlet pipe being fixedly connected to a baffle, the baffle being inclined relative to the air inlet pipe.

[0008] Through the above technical solution, the purification mechanism is used to recycle and purify the waste gas. The purification mechanism introduces the primary separated gas into the second device through the first outlet. After secondary purification by the membrane module, the high-purity gas is discharged from the second outlet, and the low-purity gas returns to the inlet pipe through the second exhaust port. The gas in the second pipe gradually releases pressure in the gradually expanding channel, and with the guidance of the baffle, a spiral airflow is formed, so that the unseparated components continue to contact the fresh membrane surface during the circulation process, preventing inefficient components from accumulating in the dead zone and forming eddies, thereby achieving gradient separation and dynamic balance of gas components. The function of the inlet pipe is to introduce waste gas into the first device, and the gas circulated from the second and third devices also enters the first device through the inlet pipe. The function of the baffle is to prevent waste gas from entering the second and third devices through the second pipe.

[0009] The present invention is further configured such that: the filtration mechanism includes a third air inlet and a third air outlet installed on the top of the third device; the third air outlet is used to discharge exhaust gas; the third air inlet is connected to the first exhaust outlet through a second air pipe; a third exhaust outlet is installed on one side of the third device; the third exhaust outlet is connected to the air inlet pipe through a second air pipe; a baffle is fixedly connected to one end of the second air pipe inside the air inlet pipe; the baffle is inclined relative to the air inlet pipe.

[0010] Through the above technical solution, the function of the filtration mechanism is to circulate gas and discharge waste gas; the third outlet discharges the qualified tail gas after treatment by the third device, and the unqualified waste gas returns to the inlet pipe through the third exhaust port. The gas velocity in the gas pipe is reduced in the gradually expanding channel, and the guide channel formed by the baffle allows the residual target components in the waste gas to re-enter the separation cycle, avoiding interstage interference caused by direct discharge of waste gas under high pressure differential conditions, maintaining the stability of the inlet concentration gradient of each membrane module, and improving the overall recovery rate.

[0011] The present invention is further configured such that: the guiding mechanism includes a plurality of inclined guide vanes fixedly connected in the secondary flow channel of the trachea, and the plurality of guide vanes are arranged at equal intervals.

[0012] Through the above technical solution, the guiding mechanism guides the gas. The guiding mechanism transforms the turbulent flow in the gas tube into laminar flow through equidistantly arranged guide vanes. The tilt angle of the vanes matches the spiral flow direction of the gas, forming a continuous streamlined guide surface in the expansion section of the flow channel. This eliminates the abrupt change in the flow field at right-angle bends, allowing gas molecules to flow parallel along the membrane surface, enhancing mass transfer efficiency, suppressing the formation of low-velocity zones, and ensuring that the gas maintains separation activity during interstage transfer.

[0013] The present invention is further configured such that: the first device, the second device and the third device are all fixedly connected to the outside of a first bracket for support and fixation, and each of them is equipped with a membrane module for membrane separation.

[0014] Through the above technical solution, the first support provides rigid support for the membrane module, eliminates the influence of equipment operation vibration on the geometry of the gradually expanding channel, maintains the preset angle of the guide vanes in the second air tube, prevents airflow deviation caused by channel deformation, ensures that the multi-stage membrane module can still maintain the functional characteristics of independent separation units under dynamic operating conditions, and avoids inter-stage flow field coupling caused by mechanical stress.

[0015] The present invention is further configured such that: the inner wall of the flow channel of the membrane module is coated with a superhydrophobic coating, the superhydrophobic coating being used for anti-fouling.

[0016] Through the above technical solutions, the superhydrophobic coating forms a nanoscale rough structure on the membrane surface, which causes water vapor and pollutants to form spherical droplets on the membrane surface and automatically fall off, preventing polar molecules from adsorbing and accumulating in the dead zone of the flow channel, maintaining the permeability of the membrane pores, and maintaining stable separation selectivity under high pressure differential conditions. This avoids the transmission of interstage concentration waves caused by membrane fouling and extends the effective separation cycle of the membrane module.

[0017] The beneficial effects of this utility model are as follows: 1. This utility model achieves gas circulation and secondary purification through a purification mechanism. It utilizes a gradually expanding flow channel combined with an inclined baffle to guide the formation of a spiral airflow, forcing unseparated components to continuously contact the fresh membrane surface, effectively eliminating flow dead zones and suppressing eddy formation, and significantly reducing interstage backmixing. The filtration mechanism achieves deep treatment and recycling of waste gas. It adopts a gradually expanding flow channel combined with a baffle guiding design, allowing residual target components to re-enter the separation cycle, while avoiding interstage interference caused by direct discharge of waste gas under high pressure differential conditions, and maintaining a stable inlet concentration gradient for each membrane module. 2. This invention optimizes fluid dynamics performance through a guiding mechanism. It utilizes equidistantly arranged inclined guide vanes to transform turbulent flow into laminar flow, forming a continuous streamlined guide surface. This eliminates abrupt changes in the flow field at right-angle turns, ensuring that the gas flows parallel to the membrane surface and maintains separation activity. The first support provides rigid support, eliminating the influence of equipment vibration on the geometry of the gradually expanding channel, maintaining the preset angle of the guide vanes, and preventing airflow deviation caused by channel deformation. A superhydrophobic coating is constructed on the membrane surface through a coating, and the nanoscale rough structure enables automatic removal of pollutants, preventing the adsorption and accumulation of polar molecules in the dead zone of the channel, and maintaining membrane pore permeability. Attached Figure Description

[0018] Figure 1 This is a first-view structural diagram of the present invention; Figure 2 This is a second-view sectional view of the present invention; Figure 3 for Figure 2 A magnified view of a section at point A in the middle; Figure 4 This is a third-view sectional view of the present invention; Figure 5 for Figure 4 A magnified view of a section at point B in the middle; Figure 6 This is a fourth-angle sectional view of the present invention.

[0019] In the figure: 1. First device; 2. Second device; 3. Third device; 4. Second air pipe; 5. First air inlet; 6. Air inlet pipe; 7. Baffle; 8. Purification mechanism; 801. First air outlet; 802. Second air inlet; 803. Second air outlet; 804. Second exhaust outlet; 9. First exhaust outlet; 10. Filtering mechanism; 1001. Third air inlet; 1002. Third air outlet; 1003. Third exhaust outlet; 11. Guide mechanism; 1101. Guide vane; 12. First support; 13. Membrane module; 14. Superhydrophobic coating. Detailed Implementation

[0020] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the scope of protection of the present invention.

[0021] Please see Figures 1-6This embodiment of a membrane separation device includes a first device 1, a second device 2, and a third device 3, which are connected by multiple air pipes 4. The first device 1 has a first air inlet 5 mounted on its top, and an air inlet pipe 6 is connected to the top of the first air inlet 5. Two baffles 7 are fixedly connected inside the air inlet pipe 6. A purification mechanism 8 is connected between the air inlet pipe 6 and the second device 2. The purification mechanism 8 is used to circulate gas. The purification mechanism 8 includes a first air outlet 801 mounted on the top of the first device 1. The second device 2 has a second air inlet 802 mounted on its top. The first air outlet 801 and the second air inlet 802 are connected by air pipes 4. The second air outlet 803 is mounted on the top of the second device 2 and is used to discharge the purified gas. A second exhaust port 804 is mounted on one side of the second device 2 and is connected to the air inlet pipe 6 by air pipes 4. One end of the air pipe 4 located inside the air inlet pipe 6 is connected to... The baffle 7 is fixedly connected and is inclined relative to the inlet pipe 6. The function of the purification mechanism 8 is to circulate and purify the waste gas. The purification mechanism 8 introduces the primary separated gas into the second device 2 through the first outlet 801. After secondary purification by the membrane module 13, the high-purity gas is discharged from the second outlet 803, and the low-purity gas returns to the inlet pipe 6 through the second exhaust port 804. The gas in the second pipe 4 gradually releases pressure in the gradually expanding channel. With the guidance of the baffle 7, a spiral airflow is formed, so that the unseparated components continue to contact the fresh membrane surface during the circulation process, preventing inefficient components from accumulating in the dead zone and forming eddies, thereby achieving gradient separation and dynamic balance of gas components. The function of the inlet pipe 6 is to introduce waste gas into the first device 1, and the gas circulated from the second device 2 and the third device 3 also enters the first device 1 through the inlet pipe 6. The function of the baffle 7 is to prevent waste gas from entering the second device 2 and the third device 3 through the second pipe 4.

[0022] like Figures 1-4As shown, a first exhaust port 9 is installed on one side of the first device 1. A filter mechanism 10 is connected between the first exhaust port 9 and the third device 3. The filter mechanism 10 is used to purify the exhaust gas. The filter mechanism 10 includes a third air inlet 1001 and a third air outlet 1002 installed on the top of the third device 3. The third air outlet 1002 is used to discharge exhaust gas. The third air inlet 1001 is connected to the first exhaust port 9 through a second air pipe 4. A third exhaust port 1003 is installed on one side of the third device 3. The third exhaust port 1003 is connected to the air inlet pipe 6 through a second air pipe 4. The second air pipe 4 is located at the air inlet. A baffle 7 is fixedly connected to one end of the pipe 6. The baffle 7 is inclined relative to the inlet pipe 6. The function of the filter mechanism 10 is to circulate gas and discharge waste gas. The third outlet 1002 discharges the qualified tail gas after treatment by the third device 3. The unqualified waste gas returns to the inlet pipe 6 through the third exhaust port 1003. The gas velocity in the gas pipe 4 decreases in the gradually expanding channel. The guide channel formed by the baffle 7 allows the residual target components in the waste gas to re-enter the separation cycle, avoiding interstage interference caused by direct discharge of waste gas under high pressure differential conditions, maintaining the stability of the inlet concentration gradient of each membrane module 13, and improving the overall recovery rate.

[0023] like Figures 2-3 As shown, the diameter of the flow channel of the second trachea 4 gradually increases with the direction of gas flow. A guiding mechanism 11 is connected inside the second trachea 4. The guiding mechanism 11 is used to guide the gas to form laminar flow and reduce turbulence. The guiding mechanism 11 includes multiple inclined guide vanes 1101 fixedly connected inside the flow channel of the second trachea 4. The multiple guide vanes 1101 are arranged at equal intervals. The function of the guiding mechanism 11 is to guide the gas. The guiding mechanism 11 transforms the turbulence in the second trachea 4 into laminar flow through the equally spaced guide vanes 1101. The inclination angle of the vanes matches the spiral flow direction of the gas, forming a continuous streamlined guide surface in the expansion section of the flow channel. This eliminates the abrupt change in the flow field at the right-angle bend, allows gas molecules to flow parallel along the membrane surface, enhances mass transfer efficiency, suppresses the formation of low-velocity regions, and ensures that the gas maintains separation activity during interstage transfer.

[0024] like Figures 1-6 As shown, the first device 1, the second device 2 and the third device 3 are all fixedly connected to the outside of the first bracket 12 for support and fixation, and each of them is equipped with a membrane module 13 for membrane separation. The first bracket 12 provides rigid support for the membrane module 13, eliminates the influence of equipment operation vibration on the geometry of the gradually expanding channel, maintains the preset angle of the guide vane 1101 in the second air tube 4, prevents airflow deviation caused by channel deformation, ensures that the multi-stage membrane module 13 can still maintain the functional characteristics of an independent separation unit under dynamic working conditions, and avoids inter-stage flow field coupling caused by mechanical stress.

[0025] like Figure 6As shown, the flow channel wall of membrane module 13 is coated with a superhydrophobic coating 14. The superhydrophobic coating 14 is used for antifouling. The superhydrophobic coating 14 forms a nanoscale rough structure on the membrane surface, which causes water vapor and pollutants to form spherical droplets on the membrane surface and automatically fall off. This prevents polar molecules from adsorbing and accumulating in the dead zone of the flow channel, maintains the permeability of the membrane pores, and can still maintain stable separation selectivity under high pressure differential conditions. It avoids the transmission of interstage concentration waves caused by membrane fouling and extends the effective separation cycle of membrane module 13.

[0026] In use, when the mixed gas enters the first device 1 through the inlet pipe 6, the baffle 7 pre-guides the airflow. After membrane separation by the membrane module 13 in the first device 1, the gas after primary separation enters the gas pipe 4 of the gradually expanding channel through the first outlet 801. The gradually increasing channel diameter design allows for a smooth release of gas pressure. Combined with the equidistantly arranged inclined guide vanes 1101 in the channel, turbulence is converted into laminar flow. The vane angle matches the spiral motion trajectory of the gas to form a continuous guide surface, eliminating the abrupt flow field changes caused by right-angle turns, allowing gas molecules to flow parallel to the membrane surface and maintain separation activity. After secondary purification by the second device 2, the high-purity gas is discharged from the second outlet 803, while the substandard gas returns to the inlet pipe 6 through the second exhaust port 804 to participate in recirculation. The circulating airflow forms a spiral motion trajectory in the gradually expanding channel, forcing the unseparated components to continuously contact the fresh membrane surface. To avoid the accumulation of inefficient components in the dead zone, the concentrated gas discharged from the first device 1 enters the third device 3 for deep treatment. The qualified exhaust gas is discharged from the third outlet 1002, and the residual target components return to the inlet pipe 6 through the third exhaust port 1003. The guide vanes 1101 in the second pipe 4 maintain a laminar flow state in the expansion section of the flow channel to prevent interstage interference caused by direct emission of exhaust gas under high pressure differential conditions. During equipment operation, the rigid support structure eliminates the influence of vibration on the geometry of the flow channel, ensuring that the preset angle of the guide vanes 1101 is stable. The superhydrophobic coating 14 on the membrane surface automatically removes pollutants through the nanoscale rough structure, preventing polar molecules from adsorbing and accumulating in the dead zone of the flow channel, maintaining the permeability of the membrane pores, thereby maintaining the independent functional characteristics of each separation unit under dynamic conditions, realizing the gradient separation and dynamic balance of gas components, significantly improving the overall recovery rate and extending the effective working cycle of the membrane module 13.

[0027] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A membrane separation device, comprising a first device (1), a second device (2) and a third device (3), and connected by a plurality of air tubes (4), characterized in that: The first device (1) is equipped with a first air inlet (5) on the top, and an air inlet pipe (6) is connected to the top of the first air inlet (5). Two baffles (7) are fixedly connected inside the air inlet pipe (6). A purification mechanism (8) is connected between the air inlet pipe (6) and the second device (2), and the purification mechanism (8) is used to circulate gas; A first exhaust port (9) is installed on one side of the first device (1), and a filter mechanism (10) is connected between the first exhaust port (9) and the third device (3). The filter mechanism (10) is used to purify the waste gas. The diameter of the flow channel of the second air pipe (4) gradually increases with the direction of gas flow. A guide mechanism (11) is connected inside the second air pipe (4). The guide mechanism (11) is used to guide the gas to form laminar flow and reduce turbulence.

2. The membrane separation device according to claim 1, characterized in that: The purification mechanism (8) includes a first air outlet (801) installed on the top of the first device (1), a second air inlet (802) installed on the top of the second device (2), the first air outlet (801) and the second air inlet (802) being connected through a second air pipe (4), a second air outlet (803) installed on the top of the second device (2), the second air outlet (803) being used to discharge the purified gas, a second exhaust port (804) installed on one side of the second device (2), the second exhaust port (804) being connected to the air inlet pipe (6) through a second air pipe (4), one end of the second air pipe (4) located inside the air inlet pipe (6) being fixedly connected to a baffle (7), the baffle (7) being inclined relative to the air inlet pipe (6).

3. The membrane separation device according to claim 1, characterized in that: The filter mechanism (10) includes a third air inlet (1001) and a third air outlet (1002) installed on the top of the third device (3). The third air outlet (1002) is used to discharge exhaust gas. The third air inlet (1001) is connected to the first exhaust outlet (9) through the second air pipe (4). A third exhaust outlet (1003) is installed on one side of the third device (3). The third exhaust outlet (1003) is connected to the air inlet pipe (6) through the second air pipe (4). One end of the second air pipe (4) located inside the air inlet pipe (6) is fixedly connected to the baffle (7). The baffle (7) is inclined relative to the air inlet pipe (6).

4. The membrane separation device according to claim 1, characterized in that: The guiding mechanism (11) includes multiple inclined guide vanes (1101) fixedly connected in the flow channel of the second trachea (4), and the multiple guide vanes (1101) are arranged at equal intervals.

5. The membrane separation device according to claim 1, characterized in that: The first device (1), the second device (2) and the third device (3) are all fixedly connected to the outside of a first bracket (12) for support and fixation, and each is equipped with a membrane module (13) for membrane separation.

6. A membrane separation device according to claim 5, characterized in that: The outer wall of the flow channel of the membrane module (13) is coated with a superhydrophobic coating (14), which is used to resist fouling.

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