MOFs adsorption filter element and volatile organic compound filtering system based on MOFs

Abstract

The utility model relates to an MOFs adsorption filter element and a volatile organic compound filtering system based on MOFs, and the MOFs adsorption filter element comprises a groove-shaped shell and a detachable cover plate, one side of the groove-shaped shell is open, the interior of the groove-shaped shell is hollow, and the detachable cover plate is matched with the opening of the groove-shaped shell; the two ends of the groove-shaped shell are each provided with an airflow hole, each airflow hole is communicated with a ventilation pipe, and the outer surface of each ventilation pipe is provided with a detachable connecting structure. At least one filter plate is detachably arranged in the groove-shaped shell, at least one through hole is formed in each filter plate, the surface of each filter plate is coated with MOFs (Metal Organic Frameworks), and when the filter plates are fixed in the groove-shaped shell, the angle formed by the normal of each filter plate and the center connecting line of airflow holes in the two ends of the groove-shaped shell is smaller than or equal to 30 degrees. The MOFs adsorption filter element can be used for adsorbing VOCs in gas so as to purify the gas.

Description

Technical Field

[0001] The utility model relates to the technical field of gas separation, in particular to a MOFs adsorption filter element and a volatile organic compound filtration system based on MOFs. Background Art

[0002] Currently, porous materials such as activated carbon and zeolite are widely used in the adsorption and filtration technology of volatile organic compounds (VOCs), but they have problems such as low adsorption capacity, poor selectivity, and easy saturation. Metal-organic framework (MOFs) materials have shown significant advantages in the fields of carbon capture, water capture, and VOCs adsorption due to their ultra-high specific surface area and adjustable pore structure. However, traditional adsorption filter elements usually adopt a fixed packed bed structure, and the adsorption is carried out by filling granular or fibrous adsorbents in a fixed chamber, which may lead to uneven gas flow distribution, large pressure drop, low utilization rate of adsorbents, and it is difficult to replace or clean flexibly, affecting the long-term use efficiency. Summary of the Utility Model

[0003] The purpose of this application is to provide a MOFs adsorption filter element and a volatile organic compound filtration system based on MOFs, aiming to enable the gas to flow smoothly and evenly during the adsorption operation, improve the utilization rate of MOFs adsorbents, and provide a detachable structure for easy replacement or cleaning.

[0004] To achieve the above purpose, the first aspect of this application provides a MOFs adsorption filter element, including: a trough-shaped housing with an opening on one side and a hollow interior, and a detachable cover plate matching the opening of the trough-shaped housing;

[0005] An air flow hole is respectively arranged at both ends of the trough-shaped housing, and a ventilation pipe is connected and communicated at each air flow hole, and a detachable connection structure is arranged on the outer surface of the ventilation pipe;

[0006] At least one filter plate is detachably arranged inside the trough-shaped housing, at least one through hole is arranged on each filter plate, and the surface of the filter plate is coated with metal-organic framework MOFs. When the filter plate is fixed inside the trough-shaped housing, the angle formed by the normal line of the filter plate and the center line connection of the air flow holes at both ends of the trough-shaped housing is less than or equal to 30 degrees.

[0007] Optionally, an annular lower sealing groove is arranged around the opening of the trough-shaped housing, and an annular upper sealing groove matching the lower sealing groove is arranged on the detachable cover plate. When the detachable cover plate is fixed at the opening of the trough-shaped housing, the upper sealing groove and the lower sealing groove form an annular sealing cavity in combination, and the filter element further includes a sealing ring for being arranged in the sealing cavity.

[0008] Optionally, "T" - shaped clamping parts are arranged at both ends of the filter plate, and "T" - shaped clamping grooves matching the "T" - shaped clamping parts are arranged on the inner side of the trough-shaped housing.

[0009] Optionally, the trough-shaped housing is in the shape of a cuboid. The opening of the cuboid-shaped trough-shaped housing completely covers the side surface at the opening to form a rectangle. The detachable cover plate is a rectangle matching the opening. The air flow holes are respectively arranged on a group of parallel side surfaces of the cuboid-shaped trough-shaped housing.

[0010] Optionally, the ventilation pipes at both ends of the trough-shaped housing are coaxially arranged, and the axis of the ventilation pipe coincides with the center line connecting the centers of the air flow holes at both ends of the trough-shaped housing.

[0011] Optionally, the number of the filter plates is multiple. When the multiple filter plates are fixed inside the trough-shaped housing, the multiple filter plates are arranged parallel to each other. Each filter plate has the same shape and is coaxially arranged. The axis of each filter plate coincides with the center line connecting the centers of the air flow holes at both ends of the trough-shaped housing.

[0012] Optionally, the number of through holes on the filter plate is multiple. Each through hole has the same size and shape, and the through holes on each filter plate are arranged in the same distribution manner.

[0013] Optionally, the number of through holes on the filter plate is multiple, and the through holes on adjacent filter plates are arranged in different distribution manners.

[0014] Optionally, the device further includes a one-way valve, which is communicatively arranged at at least one of the ventilation pipes for controlling the unidirectional inflow or outflow of gas into or from the trough-shaped housing.

[0015] The second aspect of the present application provides a volatile organic compound filtration system based on MOFs, including:

[0016] A gas input component for inhaling the gas to be purified;

[0017] A filter screen component communicatively arranged on the downstream air outlet side of the gas input component;

[0018] An activated carbon filtration component communicatively arranged on the downstream air outlet side of the filter screen component;

[0019] An MOFs adsorption component, including one or more MOFs adsorption filter elements as described in any item of the first aspect, communicatively arranged on the downstream air outlet side of the activated carbon filtration component.

[0020] Through the above technical solution, the gas to be processed can flow into the trough-shaped housing through the air flow holes on one side via the ventilation pipe and flow inside the trough-shaped housing. The normal line of the filter plate forms a certain angle or is parallel to the connecting line of the centers of the air flow holes, which can, to a certain extent, hinder the direct flow of the gas, enabling the gas to fully contact the MOFs on the surface of the filter plate and improving its utilization rate. During the flowing process, the gas can smoothly pass through the through holes on the filter plate and flow evenly throughout the trough-shaped housing, reducing the gas flow pressure drop and making the air flow path smooth. The MOFs adsorption filter element can be connected to other devices through the detachable connection structure on the ventilation pipe, facilitating disassembly for maintenance. Moreover, by removing the detachable cover plate, the filter plate inside can be further disassembled for maintenance, which is convenient to use. In the MOF-based volatile organic compound filtration system, after the gas is inhaled through the gas input component, it is first filtered through the filter net component and the activated carbon filtration component to prevent particulate matter and toxic gases from flowing into the MOFs adsorption filter element and affecting its adsorption capacity. Then, the filtered gas can enter the MOFs adsorption filter element to adsorb VOCs and improve the adsorption efficiency.

[0021] Other features and advantages of the present application will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings are used to provide a further understanding of the present application and constitute a part of the specification. They are used together with the following specific implementation to explain the present application, but do not constitute a limitation to the present application. In the drawings:

[0023] Figure 1 is an overall structural schematic diagram of a MOFs adsorption filter element shown according to an exemplary embodiment; [[ID=thirteen]]

[0024] Figure 2 is an internal structural schematic diagram of a MOFs adsorption filter element with the detachable cover plate hidden shown according to an exemplary embodiment;

[0025] Figure 3 is a structural schematic diagram of a trough-shaped housing shown according to an exemplary embodiment;

[0026] Figure 4 is a bottom view of a detachable cover plate shown according to an exemplary embodiment;

[0027] Figure 5 is a structural schematic diagram of a filter plate shown according to an exemplary embodiment;

[0028] Figure 6 is a principle schematic diagram of a MOF-based volatile organic compound filtration system shown according to an exemplary embodiment.

[0029] Reference Signs:

[0030] 10. MOF Adsorption Filter Element; 101. Grooved Housing; 1011. Lower Sealing Groove; 1012. Screw; 1013. Screw Fixing Part; 1014. "T"-shaped Card Slot; 1015. "T"-shaped Fixing Part; 102. Detachable Cover Plate; 1021. Upper Sealing Groove; 1022. Protruding Portion; 103. Sealing Ring; 104. Airflow Hole; 105. Vent Pipe; 106. Filter Plate; 1061. Through Hole; 1062. "T"-shaped Clamping Part; 1. MOF Adsorption Assembly; 2. Gas Input Assembly; 3. Filter Net Assembly; 31. Screen Mesh; 32. HEPA Filter; 4. Activated Carbon Filtration Assembly; 5. Valve. Detailed Implementation Modes

[0031] The following provides a detailed description of the specific implementation modes of this application in conjunction with the accompanying drawings. It should be understood that the specific implementation modes described herein are only for the purpose of illustrating and explaining this application and are not intended to limit this application.

[0032] With the acceleration of the industrial process, the emission of volatile organic compounds (VOCs) has become a global environmental problem. Among them, p-xylene has become a key focus due to its wide application in industrial fields such as plastics, coatings, and fibers. However, its high volatility and toxicity characteristics pose a serious threat to the environment and human health during production, storage, and use. Research shows that long-term exposure to a p-xylene environment can cause significant damage to the central nervous system, respiratory tract, and liver and kidney functions, and also pose a threat to air quality and the ecosystem.

[0033] In laboratory and industrial environments, p-xylene usually exists in a gaseous form. When its concentration exceeds the health and safety standards, it not only poses a direct threat to production personnel but also may lead to sudden accidents. Therefore, the development of efficient and sustainable p-xylene capture and adsorption technologies has become a key issue in the environmental protection field.

[0034] Currently, the treatment technologies for p-xylene mainly include physical adsorption, chemical adsorption, catalytic degradation, etc. Among them, physical adsorption is widely used due to its simple industry and strong adaptability. However, traditional physical adsorption materials still have various limitations. For example, traditional materials are difficult to distinguish p-xylene from other similar organic molecule, and it is difficult to achieve efficient separation; the pore structures of materials such as activated carbon are irregular and cannot be precisely matched with the size of p-xylene; most adsorption materials are prone to saturation and difficult to regenerate after use, increasing the operating cost; high-humidity environments significantly weaken the capture ability of adsorbents for p-xylene. Poor adsorption selectivity, uneven pore size distribution, low regeneration performance, and high humidity sensitivity significantly weaken the capture ability of adsorbents for p-xylene.

[0035] As an emerging porous material, Metal-Organic Frameworks (MOFs) have shown great potential in the field of gas adsorption and separation due to their high specific surface area, adjustable pore size, and diverse surface functional modifications. How to use MOFs materials to efficiently adsorb gases such as volatile organic compounds has become an urgent problem to be solved.

[0036] To facilitate the use of MOFs materials to adsorb gases such as VOCs in the gas to be treated, this application provides a MOFs adsorption filter element. See Figures 1 to 5 , the MOFs adsorption filter element includes a trough-shaped housing 101 with an opening on one side and a hollow interior, and a detachable cover plate 102 that matches the opening of the trough-shaped housing 101;

[0037] An air flow hole 104 is respectively provided at both ends of the trough-shaped housing 101, and a ventilation pipe 105 is connected and provided at each air flow hole 104, and a detachable connection structure is provided on the outer surface of the ventilation pipe 105;

[0038] At least one filter plate 106 is detachably provided inside the trough-shaped housing 101, at least one through hole 1061 is provided on each filter plate 106, the surface of the filter plate 106 is coated with a metal-organic framework MOFs, and when the filter plate 106 is fixed inside the trough-shaped housing 101, the angle formed by the normal line of the filter plate 106 and the center line connection of the air flow holes 104 at both ends of the trough-shaped housing 101 is less than or equal to 30 degrees.

[0039] Among them, see Figure 2 And Figure 3 , the interior of the trough-shaped housing 101 is hollow and used to accommodate the filter plate 106. An opening is provided on one side of the trough-shaped housing 101, and the opening matches the detachable cover plate 102. See Figure 1 , the detachable cover plate 102 can be fixed at the opening to close the interior of the trough-shaped housing 101 and form a closed adsorption and filtration working space. See Figure 2 , the detachable cover plate 102 can also be detached from the opening to facilitate the maintenance of the interior of the trough-shaped housing 101, such as cleaning or replacing the filter plate 106.

[0040] The trough-shaped housing 101 can be designed in a cuboid shape, a cube shape, a cylindrical shape, etc. according to actual use needs, and this application does not make specific restrictions on this. An opening is respectively provided at both ends of the trough-shaped housing 101 as Figure 3The air flow holes 104 shown can be circular, square, regular hexagon, etc., and the present application does not make specific limitations in this regard. At each air flow hole 104 at both ends of the trough-shaped housing 101, a ventilation pipe 105 is respectively provided. One end of the ventilation pipe 105 is open and aligned with the air flow hole 104, so that the ventilation pipe 105 is communicated with the inside of the trough-shaped housing 101, and the two ventilation pipes 105 can be respectively used for gas to flow into the trough-shaped housing 101 and flow out of the trough-shaped housing 101. A detachable connection structure is provided on the outer surface of the ventilation pipe 105 to facilitate connecting the MOFs adsorption filter element 10 to other devices to jointly form a system for adsorbing VOCs, and to facilitate disassembling the MOFs adsorption filter element 10 for maintenance. Refer to Figure 1 The detachable structure on the outer surface of the ventilation pipe 105 can be a thread. In possible implementation manners, it can also be a snap connection structure, etc., and the present application does not make specific limitations in this regard. For the end face of the ventilation pipe 105 far from the trough-shaped housing 101, a circular groove can be provided on this end face for placing an annular seal to seal the interface between the ventilation pipe 105 and other devices.

[0041] Optionally, refer to Figure 2 and Figure 3 The trough-shaped housing 101 is in the shape of a cuboid. The opening of the cuboid-shaped trough-shaped housing 101 completely covers the side surface at this opening to form a rectangle. The detachable cover plate 102 is a rectangle matching the opening. The air flow holes 104 are respectively provided on a group of parallel side surfaces of the cuboid-shaped trough-shaped housing 101.

[0042] Specifically, the outer shape of the trough-shaped housing 101 can be in the shape of a cuboid. By removing one side surface of the cuboid-shaped trough-shaped housing 101 in the design, an opening is obtained, so that the opening area can completely cover the side surface at this place, showing a rectangle, so that it is convenient to disassemble the filter plate 106 from the trough-shaped housing 101 or install the filter plate 106 into the trough-shaped housing 101 through the opening. Refer to Figure 4 To match the opening to better close the opening, the detachable cover plate 102 is a rectangle matching it. Refer to Figure 3 The air flow holes 104 can be provided on a group of parallel side surfaces of the cuboid-shaped trough-shaped housing 101. For example, a group of parallel side surfaces adjacent to the opening of the trough-shaped housing 101 can be provided with air flow holes 104, and ventilation pipes 105 are provided at the air flow holes 104. Refer to Figure 3 On the outer surface of the side wall at the opening of the trough-shaped housing 101, a plurality of screw fixing parts 1013 can be provided, and threaded holes are provided on the screw fixing parts 1013. Refer to Figure 4, a plurality of protrusion portions 1022 corresponding to the positions of the screw fixing members 1013 are provided at the edge of the detachable cover plate 102, and threaded holes penetrating the thickness of the protrusion portions 1022 are provided on the protrusion portions 1022. Further, the screw 1012 can pass through the threaded holes of the protrusion portions 1022 and be fixed in the threaded holes of the screw fixing members 1013, so as to realize the fixation of the detachable cover plate 102 and the trough-shaped housing 101. The fixed state is as Figure 1 shown.

[0043] Optionally, the ventilation pipes 105 at both ends of the trough-shaped housing 101 are coaxially arranged, and the axis of the ventilation pipe 105 coincides with the central connection line of the air flow holes 104 at both ends of the trough-shaped housing 101.

[0044] Continuing with the foregoing example, for the Figure 3 trough-shaped housing 101 in the shape of a cuboid as shown, the circular air flow holes 104 can be arranged at the geometric center of the side surface of the trough-shaped housing 101 where they are located, so that the geometric center of the air flow holes 104 coincides with the geometric center of the side surface of the trough-shaped housing 101 where they are located. The cross section of the ventilation pipe 105 is annular, and the axis of the ventilation pipe 105 can be arranged perpendicular to the side surface of the trough-shaped housing 101 where the air flow holes 104 are located. The axis of the ventilation pipe 105 passes through the center of the air flow holes 104. In this way, it can be ensured that the axes of the ventilation pipes 105 at both ends coincide, and the axis of the ventilation pipe 105 coincides with the connection line of the geometric centers of the two air flow holes 104. In possible implementation manners, the center of the air flow holes 104 can be the geometric center, centroid, etc. of the air flow holes 104. Through the coaxial design, the pressure loss can be reduced, the air flow can be made smoother, and the positioning can be simplified, which is convenient for docking with other devices.

[0045] Optionally, an annular lower sealing groove 1011 is provided around the opening of the trough-shaped housing 101, and an annular upper sealing groove 1021 matching the lower sealing groove 1011 is provided on the detachable cover plate 102. When the detachable cover plate 102 is fixed to the opening of the trough-shaped housing 101, the upper sealing groove 1021 and the lower sealing groove 1011 are combined to form an annular sealing cavity, and the filter element further includes a sealing ring 103 for being arranged in the sealing cavity.

[0046] Continuing with the foregoing example, refer to Figures 2 to 4, for the cuboid-shaped trough-shaped housing 101 with a square opening, a square lower sealing groove 1011 can be provided at the top of the side wall of the trough-shaped housing 101 around the square opening, and a square upper sealing groove 1021 matching the lower sealing groove 1011 can be provided at the bottom of the detachable cover plate 102. Their shapes can be the same. When the detachable cover plate 102 closes the opening of the trough-shaped housing 101, the upper sealing groove 1021 and the lower sealing groove 1011 are butt-jointed and matched to jointly form a sealing cavity around the opening. The sealing ring 103 can prevent gas leakage in the sealing cavity to seal the connection between the trough-shaped housing 101 and the detachable cover plate 102.

[0047] One or more filter plates 106 are provided inside the trough-shaped housing 101. For example, Figure 2 As shown in [reference], multiple filter plates 106 can be provided to improve the filtration efficiency. One or more through holes 1061 are provided on the filter plate 106. For example, Figure 5 As shown, multiple through holes 1061 can be provided. The through holes 1061 penetrate the thickness of the filter plate 106 to allow gas to flow through, ensuring smooth gas flow. A metal-organic framework MOFs is coated on the surface of the filter plate 106 for adsorbing VOCs gas. For example, UiO-66, MIL-53, or ZIF–8, etc. can be used, and it can include MOFs particles with a particle size of 10 - 100 nm. For example, in a possible implementation, it is specifically 40 nm. The MOFs material can be uniformly distributed at a high density and combined with the filter plate 106 through adhesives or pressing to ensure structural stability. The pore structure of the plate can be optimized to ensure uniform gas flow through and improve the adsorption efficiency at the same time. Of course, in possible implementations, it can also be used to capture carbon dioxide and water molecules.

[0048] The normal of the filter plate 106 can be a straight line perpendicular to the plane where the filter plate 106 is located or the upper and lower surfaces of the filter plate 106. The upper and lower surfaces of the filter plate 106 are the two surfaces with the largest area of the filter plate 106. The plane where the filter plate 106 is located can be a plane passing through the centroid or geometric center of the filter plate 106 and parallel to the upper and lower surfaces. When the filter plate is fixed inside the trough-shaped housing, by setting the angle formed by the normal of the filter plate 106 and the connection line of the gas flow centers at both ends of the trough-shaped housing 101 to be less than or equal to 30 degrees, after the gas flows in from the ventilation pipe 105, it can move along the surface of the filter plate 106 to extend its flow path, so as to fully contact all positions on the surface of the filter plate 106 and improve the adsorption efficiency of target gas molecules such as VOCs in the gas.

[0049] The filter plate 106 is detachably arranged inside the trough-shaped housing 101 for easy disassembly and maintenance, and the number of filter plates 106 inside the trough-shaped housing 101 can be adjusted according to different requirements and usage scenarios to adjust the adsorption capacity and adsorption efficiency of the MOFs adsorption filter element 10.

[0050] Optionally, refer to Figure 3 and Figure 5 , "T"-shaped connectors 1062 are provided at both ends of the filter plate 106, and "T"-shaped slots 1014 matching the "T"-shaped connectors 1062 are provided inside the trough-shaped housing 101.

[0051] Continuing with the foregoing example, for the cuboid-shaped trough-shaped housing 101, the filter plate 106 can be square and match the target cross-section of the trough-shaped housing 101, where the target cross-section is the cross-section of the trough-shaped housing 101 perpendicular to the center line connecting the air flow holes 104 at both ends of the trough-shaped housing 101. "T"-shaped connectors 1062 can be provided at both ends of the filter plate 106, refer to Figure 5 , by protruding both ends of the filter plate 106 in the thickness direction, a connector is formed together with the main body of the filter plate 106, and in a top-down view, the protruding part and the main body of the filter plate 106 form a "T" shape.

[0052] Refer to Figure 3 , a plurality of "T"-shaped fixing members 1015 can be sequentially provided on the inner wall of the trough-shaped housing 101 along the center line direction of the air flow holes 104. The top-down cross-section of the fixing member is "T"-shaped. The root of the "T"-shaped fixing member 1015 is connected to the inside of the trough-shaped housing 101, and the longitudinal part of the "T"-shaped fixing member 1015 is perpendicular to the inner wall of the trough-shaped housing 101. Thus, a "T"-shaped slot 1014 is formed between adjacent two "T"-shaped fixing members 1015. By setting the spacing of the "T"-shaped fixing members 1015, the "T"-shaped slot 1014 matches the "T"-shaped connector 1062, so that the "T"-shaped connector 1062 can be inserted into the "T"-shaped slot 1014 to fix the filter plate 106.

[0053] Optionally, refer to Figure 2 , the number of filter plates 106 is multiple. When multiple filter plates are fixed inside the trough-shaped housing, the multiple filter plates 106 are arranged parallel to each other, each filter plate 106 has the same shape and is coaxially arranged, and the axis of each filter plate 106 coincides with the center line connecting the air flow holes 104 at both ends of the trough-shaped housing 101.

[0054] Continuing with the foregoing example, when there are multiple filter plates 106, the multiple filter plates 106 can be arranged parallel to each other to simplify the internal space layout and facilitate maintenance. Each filter plate 106 can have the same shape to facilitate mass production of the filter plates 106. Refer to Figure 5 , when the square filter plate 106 is fixed inside the trough-shaped housing 101, it can be coaxially arranged, that is, the axes perpendicular to the upper and lower surfaces with the largest area of the filter plate 106 coincide, and this axis coincides with the center line connecting the air flow holes 104. This can further simplify the internal space layout, save the internal space of the device, and increase the maximum number of filter plates 106 that can be placed.

[0055] Optionally, the number of through holes 1061 on the filter plate 106 is multiple, the size and shape of each through hole 1061 are the same, and the through holes 1061 on each filter plate 106 are arranged in the same distribution manner.

[0056] With such a setting, a straight air flow channel can be formed, enabling some gas to flow straight, which helps reduce the air flow pressure drop and makes the air flow inside the trough-shaped housing 101 smoother. This layout can be selected when using a relatively large number of filter plates 106. Refer to Figure 5 , each through hole 1061 on the filter plate 106 is a circle with the same size, and the through holes 1061 are arranged in a matrix on the surface of the filter plate 106. In addition, with such a setting, each filter plate 106 can be exactly the same, which is convenient for industrial mass production.

[0057] Optionally, the number of through holes 1061 on the filter plate 106 is multiple, and the through holes 1061 on adjacent filter plates 106 are arranged in different distribution manners. With such a setting, at least some of the through holes 1061 on adjacent filter plates 106 are offset relative to each other. After the gas passes through the through holes 1061 of a previous-stage filter plate 106, due to the inertia of the air flow, it can contact the solid part of the filter plate 106 and flow along the surface of the filter plate 106, which helps extend the flow path of the gas. This setting method can be adopted when the number of filter plates 106 is small or the adsorption capacity requirement is high.

[0058] Optionally, the MOFs adsorption filter element 10 may further include a one-way valve, which is connected in series at least at one of the ventilation pipes 105 for controlling the unidirectional inflow or outflow of gas into or from the trough-shaped housing 101. For example, a one-way valve can be provided at the ventilation pipe 105 for air intake, allowing only gas to flow from the outside into the trough-shaped housing 101, and another one-way valve can be provided at the ventilation pipe 105 for air outlet, allowing only gas to flow out of the trough-shaped housing 101 to prevent external gas from flowing back.

[0059] Figure 6 FIG. is a volatile organic compound filtration system based on MOFs shown according to an exemplary embodiment. Refer to Figure 6 , the system includes:

[0060] A gas input component 2 for inhaling the gas to be purified;

[0061] A filter net component 3, which is connected in series to the downstream air outlet side of the gas input component 2;

[0062] An activated carbon filtration component 4, which is connected in series to the downstream air outlet side of the filter net component 3;

[0063] The MOF adsorption assembly 1 includes one or more MOF adsorption filter elements 10, which are communicatively disposed on the downstream air outlet side of the activated carbon filtration assembly 4.

[0064] Among them, the gas input assembly 2 can be a fan, which is used to suck the gas to be purified, such as the waste gas or gas containing VOCs discharged from a factory or a laboratory, into the MOF-based volatile organic compound filtration system and provide power for the gas to flow through the subsequent filter mesh assembly 3, activated carbon filtration assembly 4, and MOF adsorption assembly 1 in sequence.

[0065] The filter mesh assembly 3 is disposed on the downstream air outlet side of the gas input assembly 2 and is used to filter particulate matters in the gas. Optionally, the filter mesh assembly 3 can include a screen mesh, a HEPA filter, a primary filter mesh, etc. For example, the filter mesh assembly 3 can include the screen mesh 31 and the HEPA filter 32 as shown in Figure 2 wherein, the screen mesh 31, as the primary filtration layer, can be composed of a metal screen mesh or synthetic fiber to form a mesh structure, and its aperture is relatively large, mainly used to intercept large particulate matters (such as dust, hair, insects, etc.) in the gas, thereby reducing the load of the subsequent HEPA filter 32 and extending the service life of the system. The screen mesh 31 has the characteristics of simple structure, easy cleaning, and low air resistance, and is suitable as the first physical barrier of the filtration system. The HEPA (High efficiency particulate air Filter) filter 32 is located downstream of the screen mesh 31 and is made of randomly arranged glass fibers or polypropylene fibers, which can effectively capture particles larger than 0.3 microns (such as PM2.5, pollen, bacteria, etc.).

[0066] The activated carbon filtration assembly 4 is used to pre-treat the gas before it enters the MOF adsorption filter element 10, by adsorbing harmful chemical components such as sulfides and ammonia that may cause poisoning of the MOF material, so as to avoid the decline in adsorption efficiency caused by the poisoning of the MOF material in the MOF adsorption filter element 10. The activated carbon filtration assembly 4 is communicatively connected with the filter mesh assembly 3 and is disposed on the downstream air outlet side of the filter mesh assembly 3, for example, connected by a pipeline, to further purify the gas filtered by the filter mesh assembly 3. The activated carbon filtration assembly 4 includes activated carbon and a container for containing the activated carbon. An air inlet and an air outlet are provided on the container. The air inlet is communicatively connected with the filter mesh assembly 3, and the air outlet is communicatively connected with the MOF adsorption filter element 10 of the MOF adsorption assembly 1, so that the gas flows out of the filter mesh assembly 3 and then enters the container for filtration by the activated carbon, and then enters the MOF adsorption filter element 10 as shown in Figure 1 wherein.

[0067] The MOF adsorption assembly 1 can include one or more as shown in Figure 1The shown MOF adsorption filter element 10, the structure and function of the MOF adsorption filter element 10, etc. can be referred to the foregoing description. For example Figure 6 As shown, 4 MOF adsorption filter elements 10 can be used. The gas after being treated by the activated carbon filtration assembly 4 flows into the MOF adsorption filter element 10 of the MOF adsorption assembly 1 to adsorb VOCs therein, and the purified gas is discharged into the environment. When the number of MOF adsorption filter elements 10 is multiple, the multiple MOF adsorption filter elements 10 can be connected in parallel with the activated carbon filtration assembly 4, so that the gas flowing out of the activated carbon filtration assembly 4 enters the multiple MOF adsorption filter elements 10 simultaneously, as Figure 6 shown, to improve the purification flux per unit time. Of course, the multiple MOF adsorption filter elements 10 can also be connected in series with the activated carbon filtration assembly 4, so that the gas flowing out of the activated carbon filtration assembly 4 sequentially flows through each MOF adsorption filter element 10 step by step to improve the adsorption rate of VOCs in the gas, and finally the gas meeting the purification standard is discharged. Of course, in possible implementation manners, the series and parallel manners can also be used comprehensively, and the present application does not make specific limitations thereto.

[0068] Such as Figure 6 shown, between the activated carbon filtration assembly 4 and the MOF adsorption filter element 10, a valve 5 can be provided to control the opening and closing of the gas circuit. For example, a one-way valve can be provided to ensure the unidirectional flow of the gas. The valve 5 can also be a three-way valve to dynamically adjust the gas or pressure during the adsorption process through the three-way valve. Part of the gas can be directly discharged, and part of the gas can be recycled.

[0069] Through the above technical solution, the gas to be treated can flow into the trough-shaped housing through the air flow holes via the air pipe on one side and flow in the trough-shaped housing. The normal line of the filter plate forms a certain angle or is parallel to the center line connection of the air flow holes, which can to a certain extent hinder the direct flow of the gas, so that the gas is in full contact with the MOFs on the surface of the filter plate, improving its utilization rate. During the flowing process, the gas can smoothly pass through the filter plate through the through holes on the filter plate and flow evenly everywhere in the trough-shaped housing, reducing the gas flow pressure drop, making the air flow line smooth. The MOF adsorption filter element can be connected to other devices through the detachable connection structure on the air pipe, which is convenient for disassembly and maintenance. And by disassembling the detachable cover plate, the filter plate therein can be further disassembled for maintenance, which is convenient to use. In the volatile organic compound filtration system based on MOFs, after the gas is inhaled through the gas input assembly, it is first filtered by the filter screen assembly and the activated carbon filtration assembly to prevent particulate matter and toxic gases from flowing into the MOF adsorption filter element and affecting its adsorption capacity. Then the filtered gas can enter the MOF adsorption filter element to adsorb VOCs and improve the adsorption efficiency.

[0070] The preferred embodiments of the present application have been described in detail above in conjunction with the accompanying drawings. However, the present application is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present application, various simple modifications can be made to the technical solutions of the present application, and these simple modifications all fall within the protection scope of the present application.

[0071] In addition, it should be noted that, in the various specific technical features described in the above specific embodiments, they can be combined in any suitable manner without conflict. To avoid unnecessary repetition, the present application will not separately describe various possible combination methods.

[0072] Furthermore, any combination can be made between various different embodiments of the present application, as long as it does not violate the idea of the present application, and it should also be regarded as the content recorded in the present application.

Claims

1. A MOFs adsorption filter element, characterized in that, It includes a trough-shaped housing with an opening on one side and a hollow interior, and a detachable cover plate that matches the opening of the trough-shaped housing; An air flow hole is provided at each of the two ends of the trough-shaped housing, and a ventilation pipe is connected and arranged at each air flow hole, and a detachable connection structure is arranged on the outer surface of the ventilation pipe; At least one filter plate is detachably arranged inside the trough-shaped housing, at least one through hole is arranged on each filter plate, and a metal-organic framework MOFs is coated on the surface of the filter plate. When the filter plate is fixed inside the trough-shaped housing, the angle formed by the normal line of the filter plate and the center line connecting the air flow holes at both ends of the trough-shaped housing is less than or equal to 30 degrees.

2. The MOF adsorption filter element according to claim 1, wherein A circular lower sealing groove is arranged around the opening of the trough-shaped housing, and a circular upper sealing groove that matches the lower sealing groove is arranged on the detachable cover plate. When the detachable cover plate is fixed at the opening of the trough-shaped housing, the upper sealing groove and the lower sealing groove form a circular sealing cavity in combination, and the MOFs adsorption filter element further includes a sealing ring for being arranged in the sealing cavity.

3. The MOF adsorption filter element according to claim 1, wherein "T"-shaped clamping members are arranged at both ends of the filter plate, and "T"-shaped clamping grooves that match the "T"-shaped clamping members are arranged on the inner side of the trough-shaped housing.

4. The MOF adsorption filter element according to claim 1, wherein The trough-shaped housing is in a cuboid shape, and the opening of the cuboid-shaped trough-shaped housing completely covers the side surface at the opening to form a rectangle. The detachable cover plate is a rectangle that matches the opening, and the air flow holes are respectively arranged on a group of parallel side surfaces of the cuboid-shaped trough-shaped housing.

5. The MOFs adsorption filter element according to claim 4, wherein The ventilation pipes at both ends of the trough-shaped housing are coaxially arranged, and the axis of the ventilation pipe coincides with the center line connecting the air flow holes at both ends of the trough-shaped housing.

6. The MOF adsorption filter element according to claim 5, wherein, The number of the filter plates is multiple. When the multiple filter plates are fixed inside the trough-shaped housing, the multiple filter plates are arranged parallel to each other, each filter plate has the same shape and is coaxially arranged, and the axis of each filter plate coincides with the center line connecting the air flow holes at both ends of the trough-shaped housing.

7. The MOF adsorption filter element according to claim 6, characterized in that The number of through holes on the filter plate is multiple, the size and shape of each through hole are the same, and the through holes on each filter plate are arranged in the same distribution manner.

8. The MOF adsorption filter element according to claim 6, wherein The number of through holes on the filter plate is multiple, and the through holes on adjacent filter plates are arranged in different distribution manners.

9. The MOF adsorption filter element according to claim 1, characterized in that The MOFs adsorption filter element further includes a one-way valve, which is connected and arranged at at least one of the ventilation pipes and is used to control the unidirectional inflow or outflow of gas into or from the trough-shaped housing.

10. A MOF-based volatile organic compound filtration system, characterized in that, It includes: A gas input component for inhaling the gas to be purified; A filter net component, which is connected and arranged on the downstream air outlet side of the gas input component; An activated carbon filter component, which is connected and arranged on the downstream air outlet side of the filter net component; A MOFs adsorption component, including one or more of the MOFs adsorption filter elements as described in any one of claims 1 to 9, which is connected and arranged on the downstream air outlet side of the activated carbon filter component.

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