Anti-pollution cross-flow membrane assembly for biogas purification

Abstract

The utility model discloses an anti-pollution cross-flow membrane component for biogas purification, which relates to the technical field of biogas purification equipment, and comprises a membrane shell, a rotary flow guide shaft, a hollow fiber membrane filament bundle, a water inlet, a water outlet, a water outlet, a water outlet, a water outlet, a water inlet, a water outlet, a water outlet and a water outlet, and is characterized in that the membrane shell is provided with a biogas inlet, a purified gas outlet and a permeated gas outlet; the rotary flow guide shaft is arranged in the center of the membrane shell and is coaxial with the hollow fiber membrane tow; two ends of the rotary flow guide shaft are mounted on an end cover of the membrane shell through bearings; blades are arranged on the rotary flow guide shaft, the outer diameter of each blade is smaller than the inner diameter of the membrane shell, and the rotary flow guide shaft rotates under the driving of pressurized marsh gas introduced into the membrane shell, so that the shearing force and the disturbance degree of fluid on the surface of the membrane are increased. The strong disturbance can effectively prevent pollutants from adhering and accumulating on the surface of the membrane and reduce the contact time and the adhesion probability of the pollutants and the surface of the membrane, so that the rate of membrane pollution is remarkably reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a biogas purification equipment technical field, especially a kind of anti-pollution cross-flow membrane module for biogas purification. BACKGROUND

[0002] With the increasing demand for clean energy worldwide, biogas, as a renewable clean energy, can be widely used in pipeline gas, fuel cell and other fields after purification, and its efficient purification technology becomes a research hotspot. Membrane separation technology has good application prospect in the field of biogas purification due to its high separation efficiency, low energy consumption and simple operation. The existing membrane module adopts static structure design, and the gas flows in low disturbance state on the membrane surface, which causes the pollutants to easily adhere and accumulate on the membrane surface. SUMMARY

[0003] To solve the technical problem that the gas flows in low disturbance state on the membrane surface in the prior art, which causes the pollutants to easily adhere and accumulate on the membrane surface, the utility model provides an anti-pollution cross-flow membrane module for biogas purification.

[0004] The technical scheme adopted by the utility model is:

[0005] An anti-pollution cross-flow membrane module for biogas purification comprises:

[0006] A membrane shell is provided with a biogas inlet, a purified gas outlet and a permeate gas outlet;

[0007] A hollow fiber membrane filament bundle is installed in the membrane shell;

[0008] A rotating flow guide shaft is arranged at the center of the membrane shell and coaxially arranged with the hollow fiber membrane filament bundle, and the two ends of the rotating flow guide shaft are installed on the end covers of the membrane shell through bearings; blades are arranged on the rotating flow guide shaft, the outer diameter of the blades is smaller than the inner diameter of the membrane shell, and the rotating flow guide shaft rotates under the driving of pressurized biogas entering the membrane shell.

[0009] Preferably, the surface of the hollow fiber membrane filament is plated with a TiO2 photocatalytic layer.

[0010] Preferably, an ultraviolet light source is arranged on the membrane shell, the irradiation end of the ultraviolet light source is arranged in the membrane shell, and the ultraviolet light source is used to excite the photocatalytic activity of the TiO2 photocatalytic layer.

[0011] Preferably, the edge of the blade is arc-shaped.

[0012] Preferably, the blade is inclined arranged on the rotating flow guide shaft.

[0013] Preferably, the rotating flow guide shaft is provided with a flow guide and flow stabilizing cover near the end close to the biogas inlet.

[0014] Preferably, the inner diameter of the flow guide and flow stabilizing cover gradually shrinks from the biogas inlet side to the inside of the membrane shell, and the inner wall of the flow guide and flow stabilizing cover is curved.

[0015] Preferably, a bearing seat is arranged in the flow guide and flow stabilizing cover, the flow guide and flow stabilizing cover is connected with the bearing seat through a support rod, and the bearing seat is connected with the rotating flow guide shaft.

[0016] The beneficial effects of the present application are: the rotating flow guide shaft and the blades are arranged, the rotating flow guide shaft rotates under the driving of the pressurized biogas, and the gas forms cross flow in the membrane assembly. Compared with the low disturbance flow state of the gas in the existing static structure membrane assembly, the cross flow can greatly increase the shear force and disturbance degree of the fluid on the membrane surface. The strong disturbance can effectively prevent the pollutants from adhering and accumulating on the membrane surface, reduce the contact time and adhesion probability of the pollutants and the membrane surface, and thus significantly reduce the rate of membrane pollution. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a side view structural schematic diagram of the present application;

[0018] Figure 2 It is a side view sectional structural schematic diagram of the present application;

[0019] Figure 3 It is a side view sectional structural schematic diagram of the present application with a flow guide and flow stabilizing cover;

[0020] Figure 4 It is a front view structural schematic diagram of the flow guide and flow stabilizing cover of the present application.

[0021] Reference signs: 1, membrane shell; 101, biogas inlet; 102, purified gas outlet; 103, permeated gas outlet; 2, hollow fiber membrane filament bundle; 3, rotating flow guide shaft; 4, blade; 5, ultraviolet light source; 6, flow guide and flow stabilizing cover; 7, bearing seat; 8, support rod. DETAILED DESCRIPTION

[0022] In order to make the purpose, scheme and advantages of the present application more clear and explicit, the present application will be further described in detail below in combination with embodiments and drawings. The illustrative embodiments and the description thereof are only used to explain the present application, and do not limit the present application.

[0023] In the following description, numerous specific details are set forth to provide a thorough understanding of the present application. However, it will be apparent to one skilled in the art that the present application can be practiced without the specific details. In other instances, well-known structures, circuits, materials or the like have not been described in order to avoid obscuring the present application.

[0024] Reference throughout this specification to "one embodiment", "an embodiment", "one example", or "an example", means that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in at least one embodiment of the application. Thus, the appearances of the phrases "in one embodiment", "in an embodiment", "in one example", or "in an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics can be combined in any suitable

[0025] In the description of the present application, the terms "front", "back", "left", "right", "top", "bottom", "vertical", "horizontal", "high", "low", "inner", "outer", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the scope of protection of the present application.

[0026] Embodiments

[0027] A kind of anti-pollution cross-flow membrane module for biogas purification, comprising: membrane shell 1, hollow fiber membrane filament bundle 2 and rotating flow guide shaft 3, the membrane shell 1 is provided with biogas inlet 101, purified gas outlet 102 and permeate gas outlet 103;Hollow fiber membrane filament bundle 2, the hollow fiber membrane filament bundle 2 is installed in membrane shell 1;The rotating flow guide shaft 3 is arranged in the center of membrane shell 1 and is coaxially arranged with hollow fiber membrane filament bundle 2, both ends of the rotating flow guide shaft 3 are installed on the end cover of membrane shell 1 by bearing;The rotating flow guide shaft 3 is provided with blade 4, the outer diameter of the blade 4 is less than the inner diameter of membrane shell 1, the rotating flow guide shaft 3 is rotated under the driving of pressurized biogas into membrane shell 1.

[0028] Exemplary, as Figure 1As shown, a biogas inlet 101 is opened at one end of the membrane shell 1, and a standard flange connection is adopted to facilitate connection with the external biogas conveying pipeline. A purified gas outlet 102 is opened at the other end of the membrane shell 1, and is used to connect to the subsequent gas storage or use equipment. The high-purity biogas obtained after membrane separation is conveyed out through the purified gas outlet 102. Two permeate gas outlets 103 are provided on the side wall of the membrane shell 1. The permeate gas outlets 103 are used to discharge the low-molecular-weight gas (such as carbon dioxide and hydrogen sulfide) that permeates the membrane during the membrane separation process, and are connected to the waste gas treatment device through a pipeline for subsequent treatment.

[0029] Exemplarily, the prepared hollow fiber membrane filaments are tightly arranged into a bundle, and the two ends are fixed on a specially-made membrane filament support plate by epoxy resin. The membrane filament support plate is made of polypropylene material, which has good chemical corrosion resistance and mechanical strength. The membrane filament support plate is uniformly distributed with small holes with a diameter of 1.5 mm. The hollow fiber membrane filaments pass through the small holes and are sealed and fixed by epoxy resin, so as to ensure that the gas can only permeate and separate through the membrane filaments. The membrane filament support plate loaded with the membrane filament bundle is installed in the membrane shell 1, and a rubber sealing ring is used to seal between the membrane filament support plate and the inner wall of the membrane shell 1 to prevent gas leakage.

[0030] Exemplarily, the rotating flow guide shaft 3 is made of lightweight aluminum alloy material, which has small density and high strength. The lightweight of the shaft can reduce the load on the bearing, and the high strength can ensure the structural stability during high-speed rotation. The blades 4 are installed on the rotating flow guide shaft 3 through a clamping groove structure. The surface of the rotating flow guide shaft 3 is processed with protrusions matching the clamping grooves of the blades 4. Then, the clamping grooves of the blades 4 are aligned with the protrusions on the shaft, and the blades 4 are fixed on the shaft through bolts. High-strength bolts are used to connect each blade 4 and the shaft, and thread locking glue is applied to ensure that the blades 4 will not loosen or fall off during rotation.

[0031] Exemplarily, bearings are installed at both ends of the rotating flow guide shaft 3, and mounting holes matching the outer diameters of the bearings are processed on the end covers of the membrane shell 1. In actual operation, the pressurized biogas enters the membrane shell 1 from the biogas inlet 101, impacts the blades 4 on the rotating flow guide shaft 3, and drives the rotating flow guide shaft 3 to rotate at high speed. The rotating blades 4 form a cross flow in the membrane shell 1, effectively reducing the attachment and accumulation of pollutants on the surface of the hollow fiber membrane filaments, and improving the anti-pollution ability of the membrane assembly and the biogas purification efficiency. The purified gas after membrane separation is discharged from the purified gas outlet 102, and the permeate gas is discharged from the permeate gas outlet 103, realizing the efficient purification process of biogas.

[0032] In one possible implementation, the surface of the hollow fiber membrane filament is plated with a TiO2 photocatalytic layer.

[0033] Exemplarily, tetrabutyl titanate (TBT) is taken as a precursor, dissolved in anhydrous ethanol at a volume ratio of 1:3, a small amount of glacial acetic acid (5% of the total solution volume) is added as a stabilizer, stirred for 30 minutes to be uniform, a transparent TiO2sol is formed, the hollow fiber membrane bundle 2 is vertically immersed into the TiO2sol, and is pulled at a speed of 50 mm / min to make the sol uniformly coated on the membrane surface. The plating process is repeated for 3 times, and after each plating, the membrane is dried at 80°C for 1 hour to form a wet film layer with a thickness of about 50 nm. The plated membrane bundle is placed in a muffle furnace, heated to 500°C at a heating rate of 5°C / min, and kept for 2 hours to make the TiO2sol dehydrate and condense to form a TiO2photocatalytic layer of anatase type.

[0034] In a possible implementation, as shown in Figure 2 The membrane shell 1 is provided with an ultraviolet light source 5, the irradiation end of the ultraviolet light source 5 is arranged in the membrane shell 1, and the ultraviolet light source 5 is used to excite the photocatalytic activity of the TiO2photocatalytic layer.

[0035] Exemplarily, a medium-pressure mercury lamp is selected as the ultraviolet light source 5, the model is HOK-250, the output wavelength range is 200-400 nm, the main peak wavelength is 365 nm, the TiO2photocatalytic layer can be effectively excited, the power is 250 W, and sufficient intensity of ultraviolet light can be provided to cover the entire inside of the membrane shell 1.

[0036] Exemplarily, an installation hole is arranged at the top center of the membrane shell 1, the hole diameter is matched with the size of the ultraviolet lamp holder. The ultraviolet lamp is vertically installed downwards, the lamp body is fixed on the top of the membrane shell 1 through a specially-made sealing lamp holder, the sealing property between the lamp holder and the membrane shell 1 is ensured, and biogas leakage is prevented. The irradiation end is deeply arranged in the membrane shell 1. In actual operation, the ultraviolet light emitted by the ultraviolet lamp installed at the top is reflected by the reflector and uniformly irradiates the surface of the hollow fiber membrane in the membrane shell 1, so that the TiO2photocatalytic layer excites and oxidizes and decomposes the pollutants in the biogas. The rotation of the rotating flow guide shaft 3 drives the rotation of the blades 4, so that the biogas forms a cross flow, which on the one hand accelerates the contact reaction between the pollutants and the TiO2photocatalytic layer, and on the other hand timely removes the reaction products, avoids the accumulation of the reaction products on the membrane surface, and effectively improves the anti-pollution ability of the membrane module and the biogas purification efficiency.

[0037] In a possible implementation, the edge of the blade 4 is in a circular arc shape. The blade 4 is arranged obliquely on the rotating flow guide shaft 3.

[0038] For example, the angle between the blade 4 and the axial section of the rotating flow guide shaft 3 can be 30°. This angle can maximize the axial kinetic energy of the converted gas flow into the rotational kinetic energy of the rotating flow guide shaft 3, so that the rotating flow guide shaft 3 can obtain stable and efficient rotating speed, and drive the biogas to form an ideal cross-flow velocity in the membrane shell 1. Increasing the disturbance degree of the fluid on the membrane surface can more efficiently reduce the attachment and accumulation of pollutants on the membrane surface.

[0039] In one possible implementation, as shown in FIG. 1, the rotating flow guide shaft 3 is arranged near the biogas inlet end of the membrane shell 1, and the rotating flow guide shaft 3 is connected to the bearing seat 7 through the support rod 8. Figure 3 With Figure 4 As shown in FIG. 1, the rotating flow guide shaft 3 is arranged near the biogas inlet end of the membrane shell 1, and the rotating flow guide shaft 3 is connected to the bearing seat 7 through the support rod 8.

[0040] For example, the whole of the flow guide and flow stabilizer cover 6 is trumpet-shaped, and the inner diameter of the flow guide and flow stabilizer cover 6 gradually shrinks from the biogas inlet 101 side to the inside of the membrane shell 1. The bearing seat 7 is arranged between the flow guide and flow stabilizer cover 6 and the rotating flow guide shaft 3, so that the two can relatively independently rotate. In this way, the flow guide and flow stabilizer cover 6 is fixed on the membrane shell 1 and does not rotate with the rotating flow guide shaft 3, avoiding the interference of the rotating part to the air flow regulation. At the same time, the rotating flow guide shaft 3 can freely rotate, ensuring the normal work of the blade 4. The inner wall of the flow guide and flow stabilizer cover 6 is connected to the bearing seat 7 through a plurality of support rods 8, and the support rods 8 are uniformly distributed on the circumference to reduce the obstruction to the air flow.

[0041] In summary, the pressurized biogas enters the membrane shell 1 through the biogas inlet 101 connected by a flange at one end of the membrane shell 1. The biogas flows in the membrane shell 1, and the hollow fiber membrane bundle 2 separates the biogas. After the membrane separation, the high-purity biogas is discharged from the purified gas outlet 102 at the other end of the membrane shell 1 and connected to the subsequent gas storage or use equipment; and the low-molecular-weight gases, such as carbon dioxide and hydrogen sulfide, permeate the membrane and are discharged from the permeation gas outlet 103 on the side wall of the membrane shell 1 and sent to the waste gas treatment device through a pipeline. After the biogas enters the membrane shell 1, it impacts the blades 4 arranged on the rotating flow guide shaft 3 at an angle (for example, the angle between the axial section and the blade is 30°) and with a circular arc-shaped edge. The angle design enables the biogas to impact the blades 4 and convert the axial kinetic energy into the rotational power of the rotating flow guide shaft 3 to a maximum extent, driving the rotating flow guide shaft 3 to rotate at a high speed. The rotating blades 4 promote the formation of a cross flow of the biogas in the membrane shell 1, increasing the disturbance degree of the fluid on the membrane surface. The surface of the hollow fiber membrane filament is plated with a TiO2 photocatalytic layer prepared by a specific process. The medium-pressure mercury lamp (model HOK-250) installed at the top of the membrane shell 1 serves as the ultraviolet light source 5. The ultraviolet light emitted by the medium-pressure mercury lamp has a wavelength range of 200-400 nm and a main peak wavelength of 365 nm. After being reflected by the reflector, the ultraviolet light uniformly irradiates the surface of the membrane filament, exciting the photocatalytic activity of the TiO2 photocatalytic layer. The active substances generated by the photocatalytic layer oxidize and decompose the pollutants in the biogas. At the same time, the cross flow of the biogas formed by the rotating flow guide shaft 3 accelerates the contact reaction between the pollutants and the TiO2 photocatalytic layer and timely removes the reaction products, avoiding the accumulation of the reaction products on the surface of the membrane filament. The flow guide and flow stabilizing cover 6 arranged at the end of the rotating flow guide shaft 3 close to the biogas inlet is in a horn shape, the inner diameter gradually shrinks, and the inner wall is curved, and the flow guide and flow stabilizing cover 6 stabilizes and rectifies the flow of the biogas entering the membrane shell 1. The flow guide and flow stabilizing cover 6 is connected to the bearing seat 7 in the inside through the support rod 8, the bearing seat 7 is connected to the rotating flow guide shaft 3, and the flow guide and flow stabilizing cover 6 is fixed on the membrane shell 1 and does not rotate with the rotating flow guide shaft 3. When the biogas passes through the flow guide and flow stabilizing cover 6, the flow rate and flow direction of the biogas are adjusted to impact the blades 4 on the rotating flow guide shaft 3 in a stable and uniform state.

[0042] The above-described embodiments only express the specific implementation of the present application, and the description is relatively specific and detailed, but it cannot be understood as a limitation on the scope of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of protection of the present application.

Claims

1. A pollution-resistant cross-flow membrane module for biogas purification, characterized in that, include: Membrane shell (1), wherein the membrane shell (1) is provided with a biogas inlet (101), a purified gas outlet (102) and a permeate outlet (103); Hollow fiber membrane bundle (2), the hollow fiber membrane bundle (2) is installed inside the membrane shell (1); A rotating guide shaft (3) is set at the center of the membrane shell (1) and coaxially with the hollow fiber membrane bundle (2). The two ends of the rotating guide shaft (3) are mounted on the end caps of the membrane shell (1) by bearings. A blade (4) is provided on the rotating guide shaft (3). The outer diameter of the blade (4) is smaller than the inner diameter of the membrane shell (1). The rotating guide shaft (3) rotates under the influence of pressurized biogas introduced into the membrane shell (1).

2. The anti-fouling cross-flow membrane module for biogas purification according to claim 1, characterized in that, The surface of the hollow fiber membrane is coated with a TiO2 photocatalytic layer.

3. The anti-fouling cross-flow membrane module for biogas purification according to claim 2, characterized in that, An ultraviolet light source (5) is provided on the membrane shell (1), and the irradiation end of the ultraviolet light source (5) is located inside the membrane shell (1). The ultraviolet light source (5) is used to excite the photocatalytic activity of the TiO2 photocatalytic layer.

4. The anti-fouling cross-flow membrane module for biogas purification according to claim 1, characterized in that, The edge of the blade (4) is arc-shaped.

5. A pollution-resistant cross-flow membrane module for biogas purification according to claim 1, characterized in that, The blade (4) is inclinedly disposed on the rotating guide shaft (3).

6. The anti-fouling cross-flow membrane module for biogas purification according to claim 1, characterized in that, The rotating guide shaft (3) is provided with a flow guide and flow stabilizer hood (6) at one end near the biogas inlet.

7. A pollution-resistant cross-flow membrane module for biogas purification according to claim 6, characterized in that, The inner diameter of the flow guide and stabilizer hood (6) gradually narrows from the biogas inlet (101) side to the inside of the membrane shell (1), and the inner wall of the flow guide and stabilizer hood is curved.

8. A pollution-resistant cross-flow membrane module for biogas purification according to claim 7, characterized in that, The flow guide and stabilizer cover (6) is provided with a bearing seat (7), the flow guide and stabilizer cover (6) and the bearing seat (7) are connected by a support rod (8), and the bearing seat (7) is connected to the rotating flow guide shaft (3).

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