A novel high-efficiency membrane evaporation device

Abstract

This utility model relates to the field of membrane separation and evaporation concentration technology, specifically to a novel high-efficiency membrane evaporation device. By employing a multi-layer flat-plate evaporation membrane design, where each layer comprises two layers of high-porosity, small-pore-size nanofiber membranes, the evaporation flux is significantly improved. Simultaneously, the multi-layer flat-plate evaporation membranes are tightly connected to two supporting plates via multiple fastening bolts, and the use of O-rings effectively reduces heat conduction. The modular design of the membrane frame and nanofiber membranes allows for easy replacement and cleaning of the membranes if they become contaminated, reducing maintenance costs. Furthermore, this device is applicable to various heat sources such as medium-temperature industrial waste heat, geothermal energy, and water source heat pumps, effectively addressing the challenges of existing membrane evaporation modules in terms of structural compactness, anti-fouling capability, and heat source adaptability, thus meeting the high-efficiency evaporation requirements driven by medium- and low-temperature energy sources.

Description

Technical Field

[0001] This utility model relates to the field of membrane separation and evaporation concentration technology, and in particular to a novel high-efficiency membrane evaporation device. Background Technology

[0002] Membrane evaporation technology, as an innovative separation method, effectively separates the hot-side liquid from the condensate-side liquid using a hydrophobic membrane. It then leverages the vapor pressure difference to facilitate the migration of gaseous water molecules across the membrane, thereby achieving liquid separation and concentration. Due to its unique separation mechanism, this technology has shown broad application prospects and significant economic benefits in various fields such as seawater desalination, industrial wastewater treatment, and food concentration. In particular, traditional membrane evaporators, such as those using hollow fiber or flat sheet membranes made of materials like polytetrafluoroethylene (PTFE) and polyvinylidene fluoride (PVDF), have achieved stable operation in multiple industrial scenarios, effectively improving resource utilization efficiency and environmental protection levels.

[0003] However, traditional membrane materials suffer from large pore size and low porosity; at the same time, the significant heat conduction effect leads to high energy consumption and increased operating costs; more importantly, the dense membrane material makes cleaning extremely difficult and maintenance costs high once it is contaminated; in addition, with the continuous improvement of evaporation efficiency and environmental protection requirements, existing membrane evaporation modules also face severe challenges in terms of structural compactness, anti-pollution ability and heat source adaptability, making it difficult to meet the high-efficiency evaporation requirements driven by medium and low temperature energy. Utility Model Content

[0004] The purpose of this invention is to provide a novel high-efficiency membrane evaporation device, aiming to solve the problems of large pore size and low porosity of traditional membrane materials in the prior art; at the same time, the significant heat conduction effect leads to high energy consumption and increased operating costs; more importantly, the dense membrane material is extremely difficult to clean once contaminated, resulting in high maintenance costs; in addition, with the continuous improvement of evaporation efficiency and environmental protection requirements, existing membrane evaporation modules also face severe challenges in terms of structural compactness, anti-pollution ability and heat source adaptability, making it difficult to meet the technical problems of high-efficiency evaporation driven by medium and low temperature energy.

[0005] To achieve the above objectives, this utility model employs a novel high-efficiency membrane evaporation device, comprising a multi-layer flat evaporation membrane plate, multiple fastening bolts, and two supporting and fixing plates. Each layer of the flat evaporation membrane plate includes two layers of nanofiber membrane sheets and a membrane plate frame. The two layers of nanofiber membrane sheets are respectively disposed within the membrane plate frame. The multiple membrane plate frames are respectively disposed between the two supporting and fixing plates, and the outer edges of the two supporting and fixing plates are connected by the multiple fastening bolts.

[0006] Each of the supporting fixing plates has multiple outer bolt holes at its outer edge, and each of the membrane plate frames has multiple inner bolt holes at its outer edge. The multiple fastening bolts pass through the corresponding outer bolt holes and the corresponding inner bolt holes.

[0007] Each of the external bolt holes is provided with an O-ring near the outer wall of the support fixing plate, and the O-ring is also fitted onto the corresponding fastening bolt.

[0008] Each membrane frame has a first liquid outlet and a first liquid inlet connected to both sides, and the first liquid outlet and the first liquid inlet are connected to the two layers of nanofiber membranes. Each support and fixing plate has a second liquid outlet and a second liquid inlet on both sides. The first liquid outlets between the multiple membrane frames in the middle are interconnected. The first liquid outlets of the two outermost membrane frames are connected to the corresponding second liquid outlets. The first liquid inlets between the multiple membrane frames in the middle are interconnected. The first liquid inlets of the two outermost membrane frames are connected to the corresponding second liquid inlets.

[0009] Wherein, one end of the first liquid outlet, the second liquid outlet, the first liquid inlet, and the second liquid inlet is a sub-connector, and the other end of the first liquid outlet, the second liquid outlet, the first liquid inlet, and the second liquid inlet is a female connector, and the sub-connector is compatible with the female connector.

[0010] This invention discloses a novel high-efficiency membrane evaporation device. By employing a multi-layer flat-plate evaporation membrane design, it effectively solves the problems of large pore size and low porosity inherent in traditional membrane materials. Each layer of the flat-plate evaporation membrane comprises two layers of high-porosity, small-pore-size nanofiber membranes, significantly improving the evaporation flux. Simultaneously, the multi-layer flat-plate evaporation membrane is tightly connected to two supporting plates via multiple fastening bolts. Combined with the use of O-rings, this effectively reduces heat conduction, decreases energy consumption, and solves the problem of high energy consumption. The modular design of the membrane frame and nanofiber membranes further enhances the efficiency of the device. The design allows for easy replacement and cleaning of the membrane once it becomes contaminated, reducing maintenance costs and solving the problems of dense membrane materials and difficult cleaning. In addition, the device uses a female-female connector for the liquid outlet and inlet to achieve flexible positioning and connection between modules, improving structural compactness. At the same time, its highly adaptable design makes the device suitable for various heat sources such as medium-temperature industrial waste heat, geothermal energy, and water source heat pumps, effectively addressing the challenges of existing membrane evaporation modules in terms of structural compactness, anti-contamination ability, and heat source adaptability, and meeting the demand for high-efficiency evaporation driven by medium and low temperature energy. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a three-dimensional perspective view of the novel high-efficiency membrane evaporation device of this utility model.

[0013] Figure 2 This is a three-dimensional view of the flat evaporation film plate in the novel high-efficiency membrane evaporation device of this utility model.

[0014] 1-Fastening bolt, 2-Supporting plate, 3-Nanofiber membrane, 4-Membrane frame, 5-Inner bolt hole, 6-Outer bolt hole, 7-First outlet, 8-First inlet, 9-Second outlet, 10-Second inlet. Detailed Implementation

[0015] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0016] Please see Figures 1 to 2 This utility model provides a novel high-efficiency membrane evaporation device, including a multi-layer flat evaporation membrane plate, multiple fastening bolts 1 and two support fixing plates 2. Each layer of the flat evaporation membrane plate includes two layers of nanofiber membrane sheets 3 and a membrane plate frame 4. The two layers of nanofiber membrane sheets 3 are respectively disposed in the membrane plate frame 4. The multiple membrane plate frames 4 are respectively disposed between the two support fixing plates 2, and the outer edges of the two support fixing plates 2 are connected by the multiple fastening bolts 1.

[0017] In this embodiment, a multi-layer flat-plate evaporation membrane is used. Each layer of the flat-plate evaporation membrane includes two nanofiber membrane sheets 3 and a membrane frame 4. The two nanofiber membrane sheets 3 are respectively disposed within the membrane frame 4. The nanofiber membrane sheets 3 have characteristics such as high porosity, small pore size, and high hydrophobicity. Compared with traditional membrane materials, they can significantly improve the evaporation flux and achieve efficient evaporation. Multiple membrane frames 4 are disposed between two supporting and fixing plates 2 and connected by multiple fastening bolts 1 to form a compact whole, which is conducive to system integration and scale expansion, saves space, and improves the overall operating efficiency of the device. It can be widely used in seawater desalination, industrial concentration, waste liquid recycling and other scenarios.

[0018] Furthermore, each of the supporting fixing plates 2 has multiple outer bolt holes 6 at its outer edge, and each of the membrane frame 4 has multiple inner bolt holes 5 at its outer edge, and multiple fastening bolts 1 pass through the corresponding outer bolt holes 6 and the corresponding inner bolt holes 5.

[0019] In this embodiment, this design makes the connection between the support fixing plate 2 and the membrane frame 4 more stable and reliable, ensuring the stability and sealing of the device during operation. At the same time, it facilitates the assembly and disassembly of modules. When a membrane frame 4 malfunctions or needs maintenance, it can be easily replaced by loosening the fastening bolts 1, thus improving the maintainability and service life of the device.

[0020] Furthermore, each of the outer bolt holes 6 is provided with an O-ring near the outer wall of the support fixing plate 2, and the O-ring is also fitted onto the corresponding fastening bolt 1.

[0021] In this embodiment, the O-ring seal has excellent sealing performance, effectively preventing liquid leakage from the gap between the fastening bolt 1 and the outer bolt hole 6, ensuring the device's airtightness and avoiding energy loss and environmental pollution caused by liquid leakage. Simultaneously, it reduces heat conduction, decreases energy consumption, and further improves the device's evaporation efficiency and economy.

[0022] Furthermore, each of the membrane frame 4 has a first liquid outlet 7 and a first liquid inlet 8 connected to both sides, and the first liquid outlet 7 and the first liquid inlet 8 are both connected to the two layers of nanofiber membrane 3. Each of the supporting and fixing plates 2 has a second liquid outlet 9 and a second liquid inlet 10 on both sides. The first liquid outlet 7 between the multiple membrane frame 4 in the middle is interconnected. The first liquid outlet 7 of the two outermost membrane frame 4 is connected to the corresponding second liquid outlet 9. The first liquid inlet 8 between the multiple membrane frame 4 in the middle is interconnected. The first liquid inlet 8 of the two outermost membrane frame 4 is connected to the corresponding second liquid inlet 10.

[0023] In this embodiment, the interconnected design of the inlet and outlet allows the liquid to flow smoothly within the device, achieving a highly efficient evaporation process. At the same time, it facilitates the control and regulation of the liquid within the device, improving the operational stability and evaporation effect of the device.

[0024] Furthermore, one end of the first liquid outlet 7, the second liquid outlet 9, the first liquid inlet 8, and the second liquid inlet 10 is a sub-connector, and the other end of the first liquid outlet 7, the second liquid outlet 9, the first liquid inlet 8, and the second liquid inlet 10 is a female connector, and the sub-connector is compatible with the female connector.

[0025] In this embodiment, the design of this female-female connector enables convenient positioning and connection between multiple devices, realizing modular combination and expansion of the devices. Users can flexibly increase or decrease the number of devices according to actual needs, improving the applicability and flexibility of the devices. At the same time, the connection method of the female-female connector is simple and reliable, easy to install and maintain, and reduces the cost of use.

[0026] In this invention, if a PVDF / PAN composite nanofiber membrane is selected, with a membrane size of 300×500mm, and each module integrates 10 membranes, resulting in a total membrane area of ​​1.5 m², the beneficial effects are as follows:

[0027] • Hot side inlet water temperature: 65°C, condenser side: 25°C;

[0028] • Average flux reaches 12–15 kg / m²·h;

[0029] • Membrane flux decay rate <8% after 96 hours of continuous operation;

[0030] • Module assembly / disassembly time is controlled within 10 minutes, making maintenance convenient;

[0031] • The module series connection has a post-processing capacity of over 1000L / d, which is suitable for the concentration of high-salt industrial mother liquor.

[0032] In this invention, during operation, the liquid to be processed enters the device through the second inlet 10 on the support plate 2. Since the first inlets 8 of the two outermost membrane frames 4 are connected to the corresponding second inlets 10, and the first inlets 8 between the multiple membrane frames 4 in the middle are also interconnected, the liquid can smoothly flow into the first inlets 8 connected on both sides of each membrane frame 4, and enter the multilayer flat evaporation membrane plate composed of two layers of nanofiber membranes 3 and membrane frames 4. Inside the membrane plate, thanks to the high porosity, small pore size, and high hydrophobicity of the nanofiber membranes 3, water molecules in the hot-side liquid migrate across the membrane in gaseous form to the condensation side under the action of the vapor pressure difference. At this time, because multiple fastening bolts 1 penetrate the support plate... A fixing plate tightly connects the two, and the O-ring seal provided at the outer bolt hole 6 near the outer wall of the supporting fixing plate 2 is fitted onto the fastening bolt 1, effectively preventing liquid leakage and reducing heat conduction effect. The concentrated liquid after evaporation flows out through the first liquid outlet 7. The first liquid outlets 7 between the multiple membrane plate frames 4 located in the middle are interconnected, and the first liquid outlets 7 of the two outermost membrane plate frames 4 are connected to the corresponding second liquid outlets 9. Finally, the concentrated liquid is discharged from the second liquid outlet 9 on the supporting fixing plate 2. At the same time, one end of the first liquid outlet 7, the second liquid outlet 9, the first liquid inlet 8 and the second liquid inlet 10 are female connectors and are compatible, which facilitates the flexible positioning and connection of multiple device modules, realizing efficient evaporation and system expansion.

[0033] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Those skilled in the art can understand that implementing all or part of the above-described embodiments and making equivalent changes in accordance with the claims of the present utility model are still within the scope of the utility model.

Claims

1. A novel high-efficiency membrane evaporation device, characterized in that, It includes a multi-layer flat evaporation membrane plate, multiple fastening bolts and two support fixing plates. Each layer of the flat evaporation membrane plate includes two layers of nanofiber membrane sheets and a membrane plate frame. The two layers of nanofiber membrane sheets are respectively disposed in the membrane plate frame. The multiple membrane plate frames are respectively disposed between the two support fixing plates, and the outer edges of the two support fixing plates are connected by the multiple fastening bolts.

2. The novel high-efficiency membrane evaporation device as described in claim 1, characterized in that, Each of the supporting fixing plates has multiple external bolt holes at its outer edge, and each of the membrane plate frames has multiple internal bolt holes at its outer edge, with the multiple fastening bolts passing through the corresponding external bolt holes and the corresponding internal bolt holes.

3. The novel high-efficiency membrane evaporation device as described in claim 2, characterized in that, Each of the external bolt holes is provided with an O-ring near the outer wall of the support fixing plate, and the O-ring is also fitted onto the corresponding fastening bolt.

4. The novel high-efficiency membrane evaporation device as described in claim 3, characterized in that, Each of the membrane frame frames has a first liquid outlet and a first liquid inlet connected to both sides, and the first liquid outlet and the first liquid inlet are both connected to the two layers of nanofiber membranes. Each of the supporting and fixing plates has a second liquid outlet and a second liquid inlet on both sides. The first liquid outlets between the multiple membrane frame frames in the middle are interconnected. The first liquid outlets of the two outermost membrane frame frames are connected to the corresponding second liquid outlets. The first liquid inlets between the multiple membrane frame frames in the middle are interconnected. The first liquid inlets of the two outermost membrane frame frames are connected to the corresponding second liquid inlets.

5. The novel high-efficiency membrane evaporation device as described in claim 4, characterized in that, One end of the first liquid outlet, the second liquid outlet, the first liquid inlet, and the second liquid inlet is a sub-connector, and the other end of the first liquid outlet, the second liquid outlet, the first liquid inlet, and the second liquid inlet is a female connector, and the sub-connector is compatible with the female connector.

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