Turbulent flow type air gap film distillation assembly with film support

Abstract

The utility model discloses a turbulent flow type air gap film distillation assembly with a film support, which comprises a cover plate, a plate frame, a condensation plate, an air gap partition plate and a film, and also comprises a film support element and a plurality of turbulent flow elements, the film support element and the turbulent flow elements are installed on the plate frame, the film support element is located between the turbulent flow elements and the film, and the condensation plate is located between the air gap partition plate and the film. And a plurality of uniformly distributed turbulent flow holes are formed in the turbulent flow element. The utility model can effectively enhance the turbulence effect of the feed liquid membrane surface of the membrane distillation device in the industrial application process, reduce the influence of temperature polarization phenomenon and concentration polarization phenomenon, increase the temperature of the membrane surface and reduce the feed liquid concentration of the membrane surface, thereby enhancing the thermal efficiency and enhancing the membrane distillation performance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water treatment, in particular to a turbulence type gas gap membrane distillation assembly with membrane support. BACKGROUND

[0002] Membrane distillation is a new separation process combining heat method and membrane method, and its advantage is that it can regenerate wastewater by using industrial waste heat. In the membrane distillation process, the hydrophobic membrane is used as the gas-liquid barrier, and the water in the feed liquid evaporates and vaporizes into water vapor at the contact interface between the feed liquid and the membrane. The water vapor driven by the saturation vapor pressure difference of the distillation membrane passes through the dry membrane hole, and is condensed and enriched on the cold side, so as to realize separation. Due to the hydrophobicity of the membrane, the salt in the feed liquid cannot pass through the hydrophobic distillation membrane, and the water vaporized by phase change passes through the distillation membrane and condenses on the other side, so as to achieve the purpose of material separation, concentration or purification.

[0003] The driving force of membrane distillation is the saturation vapor pressure difference caused by temperature difference, so temperature is the main factor affecting the performance of membrane distillation. Since the saturation vapor pressure of the feed liquid increases exponentially with temperature, the higher the effective temperature of the membrane surface, the greater the water production flux of the membrane distillation. However, the temperature polarization phenomenon directly affects the temperature of the membrane surface. Due to the continuous evaporation of volatile substances on the feed liquid side, the temperature of the feed liquid near the membrane surface is actually lower than that of the main body of the feed liquid, which is the temperature polarization phenomenon. The higher the temperature of the feed liquid, the faster the evaporation speed, and the more obvious the influence of temperature polarization effect.

[0004] In addition, the saturation vapor pressure is also affected by the concentration of the feed liquid. The greater the concentration of the feed liquid, the fewer the activated water molecules, and the more difficult it is for the activated water molecules in the feed liquid to escape the gas-liquid cross section, resulting in a decrease in the saturation vapor pressure of water in the feed liquid, which leads to a decrease in the water production flux of the membrane distillation and a decrease in the thermal efficiency. The essence of the membrane distillation process is the phase change and migration of water molecules, so the evaporation of water will lead to an increase in the concentration of solutes in the feed liquid, and the feed liquid near the membrane surface will continuously evaporate, so its concentration is higher than that of the main body of the feed liquid, which is the concentration polarization phenomenon.

[0005] The existing membrane distillation device is still seriously affected by the temperature polarization phenomenon and the concentration polarization phenomenon, and its performance is not very ideal. In addition, in the process of industrial application, the internal structure of the flow channel of the membrane distillation is not clear, and in order to make full use of heat in the industrialization process, a long flow channel is generally used. How to increase the turbulence degree of the feed liquid in the large space long flow channel while reducing the flow dead angle is a problem to be solved in the application process of membrane distillation. SUMMARY

[0006] The technical problem solved by the present application is to provide a turbulent air gap membrane distillation assembly with membrane support, which can effectively improve the turbulent effect of the membrane surface of the membrane distillation device in industrial application, reduce the influence of temperature polarization and concentration polarization, increase the temperature of the membrane surface, reduce the concentration of the membrane surface, improve the evaporation capacity, thereby improving the thermal efficiency and improving the performance of the membrane distillation.

[0007] The technical scheme for solving the above technical problem is:

[0008] The turbulent air gap membrane distillation assembly with membrane support provided by the present application comprises a cover plate, a plate frame, a condensing plate, an air gap partition plate and a membrane, and further comprises a membrane support element and a plurality of turbulent elements, wherein the membrane support element and the turbulent elements are both installed on the plate frame, the membrane support element is between the turbulent elements and the membrane, and a plurality of uniformly distributed turbulent holes are formed in the turbulent elements.

[0009] Optionally, the turbulent element is arc-shaped or elliptical.

[0010] Optionally, the turbulent element is elliptical, the length of the major axis of the elliptical shape ranges between the inner width and the outer width of the plate frame, and the length of the minor axis is 1 / 6-1 / 4 of the length of the major axis.

[0011] Optionally, the cross section of the turbulent element is a rectangle with rounded corners, the width of the rectangle is between 5-15mm, and the radius of the rounded corner is between 1mm and half of the width of the rectangle.

[0012] Optionally, the maximum height of the rectangle is equal to the height of the plate frame minus twice the height of the membrane support element, and the minimum height is 0.7 times the maximum height.

[0013] Optionally, the diameter of the turbulent hole is 1 / 2-2 / 3 of the height of the rectangular cross section of the turbulent element along the hole axis direction, and the center distance of the turbulent hole is 30-80mm.

[0014] Optionally, the turbulent elements are spaced apart in the plate frame in a convex manner, and the contact positions of the turbulent elements and the plate frame are equidistant, and the spacing distance is 30-160mm.

[0015] Optionally, the membrane support element is a diamond-shaped support net, the diamond-shaped top angle is between 30°-90°, and the horizontal spacing of the diamond-shaped support net is between 10-30mm; the cross section of the diamond-shaped support net is in the shape of a semi-cylinder, the diameter of the cylinder is less than 3mm, and the cylinder side is outwardly contacted with the membrane.

[0016] Optionally, the diamond-shaped support net comprises two pieces, namely a first diamond-shaped support net and a second diamond-shaped support net, which are respectively arranged on two sides of the plate frame, and the first diamond-shaped support net on one side of the plate frame is integrally formed with the plate frame.

[0017] Optionally, the second diamond-shaped support net on the other side of the plate frame is separately formed, and the edge of the second diamond-shaped support net is provided with a solid frame with a width of 2-20 mm, which covers the other side in the plate frame and is flush with the surface of the plate frame after being placed.

[0018] Optionally, the assembly further comprises a plurality of support bodies, which are uniformly distributed, one end of each of the support bodies is connected with the membrane support element, and the other end of each of the support bodies is arranged in the flow channel.

[0019] Optionally, the diameter of each of the support bodies is 5-30 mm, the lateral uniform distribution distance is 50-200 mm, and the longitudinal uniform distribution distance is 100-400 mm.

[0020] Optionally, the lower end of the plate frame is provided with a first boss, and the first boss is provided with a first opening.

[0021] Optionally, the lower end of the air gap partition is provided with a second boss, the second boss is provided with a second opening, and the air gap boss is further provided with a groove centered on the second opening.

[0022] Optionally, the groove is an elongated groove with a depth of 1 mm, a width of 3-5 mm, and a length of 40-100 mm greater than the diameter of the boss.

[0023] Optionally, the lower end of the condensing plate is provided with a third opening, and the third opening corresponds in position to the opening of the second boss.

[0024] The turbulence type air gap thin film distillation assembly with membrane support has the following beneficial effects compared with the prior art:

[0025] (1) The internal flow of the feed liquid in the thin film distillation process can be significantly improved without affecting the original flow distance, the turbulent state of the membrane surface is increased, the influence of temperature polarization and concentration polarization is weakened, the temperature of the membrane surface is increased, the concentration of the membrane surface is reduced, the water flux is increased, the thermal efficiency is improved, and the performance of the assembly is improved.

[0026] (2) The flow short circuit of the whole feed liquid can be reduced, and the flow is more complex.

[0027] (3) The flow of the feed liquid in the plate frame is more inclined to flow on the membrane surface, the local flow rate of the gap between the turbulence element and the membrane support element is increased, and the disturbance and turbulence degree of the membrane surface are increased.

[0028] (4) The turbulence holes can increase the passing ability of the main fluid and the turbulence degree of the main fluid locally, and increase the exchange between the membrane surface liquid and the main fluid.

[0029] (5) According to the simulation flow analysis and the actual test, the membrane support element using the rhombic support net can most obviously destroy the temperature polarization and the concentration polarization phenomenon; meanwhile, the rhombic support net can also keep the membrane surface relatively flat during the flow process in a large space and a long flow channel, resist the tensile deformation caused by the pressure fluctuation, reduce the flow dead angle and the flow channel short circuit, and ensure the normal operation of the thin film distillation. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is the assembly schematic diagram of the turbulence type air gap thin film distillation assembly with the membrane support in the embodiment 1 of the present application.

[0031] Figure 2 It is the arrangement position schematic diagram of the turbulence element and the membrane support assembly in the plate frame in the embodiment 1 of the present application.

[0032] Figure 3 It is the schematic diagram of the separately made membrane support element in the embodiment 1 of the present application.

[0033] Figure 4 It is the schematic diagram of the turbulence element in the present application.

[0034] Figure 5 It is the schematic diagram of the air gap partition plate in the embodiment 1 of the present application.

[0035] Figure 6 It is the schematic diagram of the condensation plate in the embodiment 1 of the present application.

[0036] Figure 7 It is the schematic diagram of the plate frame with the membrane support element in the embodiment 2 of the present application.

[0037] Figure 8 It is the schematic diagram of the separately made membrane support element in the embodiment 2 of the present application.

[0038] Figure 9 It is the schematic diagram of the turbulence element in the embodiment 2 of the present application.

[0039] Figure 10 It is the schematic diagram of the air gap partition plate in the embodiment 2 of the present application.

[0040] Figure 11 It is the schematic diagram of the condensation plate in the embodiment 2 of the present application.

[0041] Figure 12 It is the simulation flow diagram of the plate frame without adding the turbulence element.

[0042] Figure 13This is a simulated flow diagram of the plate frame after adding the turbulence-inducing element in Embodiment 2 of the present invention.

[0043] In the diagram: 1. Cover plate; 2. Plate and frame assembly; 3. Condensation plate; 4. Air gap baffle;

[0044] 5. Membrane; 21. Plate and frame; 22. Membrane support element; 23. Fluctuation element; 24. Support body;

[0045] 25. Baffle holes. Detailed Implementation

[0046] To enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0047] In view of the fact that the thin-film distillation device in the prior art is still seriously affected by temperature polarization and concentration polarization, resulting in less than ideal thin-film distillation performance, how to increase the turbulence of the feed liquid and reduce the dead flow angle in a large space and long flow channel is an urgent problem to be solved in the application of thin-film distillation. The present invention provides a turbulent air gap thin-film distillation assembly with membrane support, including a cover plate, a plate frame, a condenser plate, an air gap partition and a membrane, and further including a membrane support element and a few turbulence disturbance elements. The membrane support element and the turbulence disturbance elements are both installed on the plate frame, and the membrane support element is located between the turbulence disturbance element and the membrane. The turbulence disturbance element has a number of uniformly distributed turbulence disturbance holes.

[0048] Compared with the prior art, the present invention optimizes the internal structure design of the flow channel and its influence on the flow state by setting up turbulence elements and membrane support elements. This effectively improves the turbulence effect on the surface of the feed liquid membrane in industrial applications, reduces the influence of temperature polarization and concentration polarization, increases the temperature of the membrane surface, reduces the concentration of feed liquid on the membrane surface, and increases the evaporation rate, thereby improving thermal efficiency and enhancing the performance of thin film distillation.

[0049] Example 1

[0050] like Figures 1-6 As shown, this embodiment discloses a turbulent air gap thin film distillation assembly with membrane support, including a cover plate 1, a plate frame 21, a condenser plate 3, an air gap partition 4 and a membrane 5, and also includes a membrane support element 22 and a few turbulence elements 23. The membrane support element 22 and the turbulence elements 23 are both disposed on the plate frame 21 to form a plate frame assembly 2. The membrane support element 22 is located between the turbulence elements 23 and the membrane 5. The turbulence elements 23 have a plurality of uniformly distributed turbulence holes 25.

[0051] In some embodiments, the length of the frame 21 is 300-2000mm, its aspect ratio is 0.3-0.5, its thickness is 20-50mm, and its edge width is between 20-50mm.

[0052] In some implementations, the turbulence element 23 is arc-shaped or elliptical.

[0053] In some more specific embodiments, the turbulence element 23 is elliptical, with the length of its major axis ranging between the inner and outer widths of the frame 21, and its minor axis being 1 / 6 to 1 / 4 of the length of its major axis.

[0054] In some more specific embodiments, the cross-section of the turbulence element 23 is a rectangle with rounded corners, the width of the rectangle is between 5 and 15 mm, and the radius of the rounded corners is between 1 mm and half the width of the rectangle.

[0055] In some more specific embodiments, the maximum height of the rectangle is equal to the height of the frame minus twice the height of the membrane support element 22, and its minimum height is 0.7 times the maximum height.

[0056] In some more specific embodiments, the diameter of the turbulence hole 25 is 1 / 2 to 2 / 3 of the height of the rectangular cross-section of the turbulence element 23 along the hole axis, and the center distance of the turbulence holes is 30 to 80 mm.

[0057] In some more specific implementations, such as Figure 1 As shown, the turbulence elements 23 are distributed in the plate frame 21 in a convex manner with opposite orientations. The contact points between the turbulence elements 23 and the plate frame 21 are equidistant, with a spacing of 30 to 160 mm.

[0058] It should be noted that the connection between the aerodynamic element 23 and the plate frame 21 can be made in a way that includes, but is not limited to, integral molding, welding, mortise and tenon joints, etc. The connection can be made in a way that includes, but is not limited to, using ribs, chamfers or direct connection, but the final effect is that the aerodynamic element is firmly connected to the side wall of the plate frame.

[0059] It should be noted that the materials of the baffle element 23, the frame 21, and the membrane support element 22 include, but are not limited to, common plastics, stainless steel, and wood, but all must be firmly connected to the frame. Furthermore, the baffle element 23 can be made of hollow or solid materials, but the final result should be consistent with the shape described above.

[0060] In some embodiments, the membrane support element 22 is a rhombus-shaped support mesh with a rhombus apex angle between 30° and 90°, a lateral spacing between 10 and 30 mm, and a cross-section of the rhombus support mesh that is semi-cylindrical with a cylinder diameter of less than 3 mm, and the cylindrical side facing outwards in contact with the membrane.

[0061] In some more specific embodiments, the diamond-shaped support net comprises two pieces, namely a first diamond-shaped support net and a second diamond-shaped support net, which are respectively located on two sides of the plate frame 21. The first diamond-shaped support net on one side of the plate frame 21 is integrally formed with the plate frame 21, in other words, one side of the first diamond-shaped support net is integrally formed with the plate frame 21. The second diamond-shaped support net on the other side of the plate frame 21 is separately formed, in other words, the second diamond-shaped support net is separately formed and is located on the other side of the plate frame 21, and needs to be installed after the turbulence element 23 is placed inside the plate frame 21 and is flush with the surface of the plate frame after installation. The edge of the separately formed diamond-shaped support net (i.e. the second diamond-shaped support net) is provided with a solid frame, the width of the solid frame is 5-20 mm, and the outer edge length of the separately formed diamond-shaped support net is consistent with the inner frame length of the plate frame 21.

[0062] In some embodiments, the assembly further comprises a plurality of support bodies 24, which are uniformly distributed in the flow channel, one end of each support body 24 is connected to the membrane support element 22 in a manner including but not limited to bonding, welding, etc., and the other end of each support body 24 is in a free state and is located in the flow channel.

[0063] In some more specific embodiments, the support body 24 is a cylinder or a part of a cylinder, and the obtained effect is to ensure that the support body can reduce the deformation of the membrane support material, and the membrane support material is flush with the surface of the plate frame. The diameter of the support body 24 is 5-30 mm, the transverse uniform distribution distance is 50-200 mm, and the longitudinal uniform distribution distance is 100-400 mm.

[0064] In some embodiments, the lower end of the plate frame 21 is provided with a first boss, and the first boss is provided with a first opening to allow the condensed liquid to flow out.

[0065] Specifically, the first boss can be circular, the center of the first boss is located on the central axis of the plate frame 21 in the width direction and is flush with the inner edge of the plate frame 21, the diameter of the first boss is 10-40 mm, and the diameter of the first opening is 1 / 3 to 1 / 2 of the diameter of the first boss.

[0066] In this embodiment, the length and width of the air gap partition plate 4 are the same as those of the plate frame 21, the width of the air gap (the air gap is specifically the space surrounded between the membrane support element 22 and the condensing plate 3) is 2-10 mm, the diamond-shaped net in the air gap is used as a support net, the top angle of the diamond-shaped net is 60°, the cross section of the diamond-shaped net is a semi-cylindrical shape, the diameter of the cylinder is 5-30 mm, and the outer edge length of the diamond-shaped net is consistent with the length of the blank flow channel inside the plate frame 21.

[0067] If the air gap width is more than 3mm, the diamond net of the air gap uses a cylinder or a part of the cylinder as the support body 24 to keep the diamond net from collapsing. The diameter of the support body 24 is not more than 5mm. The support body 24 is connected with the diamond net, and the bonding methods include but are not limited to bonding, welding, etc. The support bodies 24 are uniformly distributed in the flow channel, and the transverse uniform distribution distance is between 20-100mm, and the longitudinal uniform distribution distance is between 100-300mm.

[0068] If the air gap width is less than 3mm, the air gap can be supported by the air gap partition plate 4 body.

[0069] In some embodiments, the air gap partition plate 22 lower end is provided with a second boss, the size of the second boss is consistent with the size of the first boss, the second boss is provided with a second opening, and a groove is further provided on the second boss and centered on the second opening.

[0070] Specifically, the groove is an elongated groove, the length direction is 3-5mm, the width direction is 40-100mm, and the depth is 1mm.

[0071] In some embodiments, the condensing plate 3 lower end in the assembly is provided with a third opening, the third opening corresponds to the opening position of the second boss (i.e. the second opening), and the condensing plate 3 has the same length and width as the air gap partition plate 4, and is made of materials including but not limited to metal plates and plastic plates.

[0072] It should be noted that the assembly is assembled in the same way as the existing conventional membrane distillation device, but it is necessary to ensure that the water outlet at the lower end of the assembly (i.e. the first opening, the second opening, and the third opening) is in the same direction, and the center is kept during assembly, and sealing pads are provided between the cover plate 1, the plate frame 21, the condensing plate 3, the air gap partition plate 4, and the membrane 5, etc.

[0073] The size of the sealing pad is consistent with the cross-sectional size of the plate frame 21, and the material of the sealing pad is made of materials including but not limited to rubber and silicone.

[0074] The turbulence type air gap membrane distillation assembly with membrane support in the embodiment of the application has the following advantages compared with the prior art:

[0075] (1) The internal flow of the feed liquid during the membrane distillation process can be significantly improved without affecting the original flow distance, the turbulent state of the membrane surface is increased, the influence of the temperature polarization phenomenon and the concentration polarization phenomenon is weakened, the temperature of the membrane surface is increased, the concentration of the membrane surface is reduced, the water flux is increased, the thermal efficiency is improved, and the performance of the assembly is improved.

[0076] (2) The flow short circuit of the whole feed liquid can be reduced, and the flow is more complex.

[0077] (3) The flow of the liquid in the plate frame can be more inclined to flow on the membrane surface, the local flow rate of the gap between the turbulence element and the membrane support element can be increased, and the disturbance and turbulence degree of the membrane surface can be increased.

[0078] (4) The turbulence hole can increase the passing of the main flow and the turbulence degree of the local main flow, and increase the exchange of the liquid on the membrane surface and the liquid in the main flow channel.

[0079] (5) According to the simulation flow analysis and actual test, when the membrane support element adopts the diamond support net, the damage to the temperature polarization and concentration polarization phenomena is most significant; at the same time, the diamond support net can also keep the membrane surface relatively flat during the flow process in a large space and a long flow channel, resist the tensile deformation caused by pressure fluctuation, reduce the flow dead angle and flow channel short circuit, and ensure the normal operation of the thin film distillation.

[0080] Embodiment 2

[0081] This embodiment discloses a turbulence type air gap thin film distillation assembly with a membrane support, compared with embodiment 1, as shown in Figures 7-11 , the difference is that:

[0082] In this embodiment, the length of the plate frame 21 is 1000 mm, the width of the plate frame is 350 mm, the thickness of the plate frame 21 is 20 mm, and the edge width of the plate frame 21 is 25 mm;

[0083] In this embodiment, the turbulence element 23 is an oval, the length of the long axis of the oval is 330 mm, and the length of the short axis is 60 mm; the cross section of the turbulence element 23 is a rectangle with rounded corners, the width of the rectangle is 6 mm, the radius of the rounded corner is 3 mm, and the height of the rectangle is 14 mm; the diameter of the turbulence hole 25 is 6 mm, and the center distance of the turbulence hole is 30 mm;

[0084] In this embodiment, the root spacing distance of each turbulence element 23 is 60 mm;

[0085] In this embodiment, the connection between the turbulence element 23 and the plate frame 21 adopts an integrated molding mode and is firmly connected with the side wall of the plate frame 21;

[0086] In this embodiment, the materials of the turbulence element 23, the plate frame 1 and the membrane support element 22 adopt polypropylene plastic, but they all need to be firmly connected together with the plate frame;

[0087] In this embodiment, the membrane support element 22 is a diamond support net (including a first diamond support net and a second support net, which have the same shape and different manufacturing methods), the diamond top angle is 60°, one side of the first diamond support net is integrally formed with the plate frame 21, the first diamond support net adopts a semi-cylindrical shape, the cylindrical diameter is 3 mm, and the cylindrical side is outwardly contacted with the membrane; the horizontal spacing of the first diamond support net is 25 mm, and the thickness of the diamond support net is 3 mm;

[0088] In this embodiment, the first rhombic support net uses a cylinder and a part of a cylinder as the support body 24, the diameter of the support body is 20 mm, the support body 24 is fusion welded with the first rhombic support net, and the support body 24 is uniformly distributed in the flow channel, the lateral uniform distribution distance is 150 mm, and the longitudinal uniform distribution distance is 235 mm.

[0089] In this embodiment, the first rhombic support net, the support body cylinder and the plate frame are integrally formed together and placed in the plate frame.

[0090] In this embodiment, the second rhombic support net is arranged on the other side of the plate frame 21, the second rhombic support net is separately made and covers the plate frame 21, and the length and width of the second rhombic support net are consistent with the length and width of the inner frame of the plate frame 21. The separately made rhombic support net has the following shape: the rhombic top angle is 60°, the rhombic support net adopts a semi-cylindrical shape, the diameter of the cylinder is 3 mm, the side of the cylinder faces outward and contacts the membrane, the lateral spacing of the rhombic support net is 25 mm, and the thickness is 3 mm.

[0091] In this embodiment, the plate frame 21 is provided with a circular first boss at the lower end, the center of the first boss is located on the central axis in the width direction of the plate frame, and is flush with the inner edge of the plate frame 21. The diameter of the first boss is 20 mm, and a rib plate with a width of 40 mm is arranged thereon to facilitate sealing. The diameter of the first opening is 10 mm.

[0092] In this embodiment, the air gap partition plate 4 has the same length and width as the plate frame 21, the air gap height is 2 mm, the air gap adopts a rhombic net as the support net on the air gap partition plate 4, the rhombic top angle of the rhombic net is 60°, the rhombic net adopts a semi-cylindrical shape, the diameter of the cylinder is 5 mm, the side of the cylinder faces outward and contacts the membrane, the lateral spacing of the rhombic net is 25 mm, and the edge of the rhombic net is provided with a solid frame with a width of 25 mm.

[0093] In this embodiment, the air gap partition plate 4 is provided with a circular second boss with a hole at the lower end, the outer contour size of the second boss is consistent with that of the first boss on the plate frame 21, and an elongated groove with a length of 5 mm and a width of 70 mm is opened on the second boss with the center of the circle as the center, and the depth is 1 mm.

[0094] In this embodiment, the condensing plate 3 is supported by a stainless steel metal plate, the length is 1000 mm, the width is 350 mm, and a circular hole (i.e. a third opening) is opened at the lower end. The position of the circular hole is the same as that of the opening of the second boss.

[0095] In this embodiment, the sealing gasket adopts a 1 mm thick silica gel gasket, the length is 1000 mm, the width is 350 mm, and the edge width is 25 mm.

[0096] When the conventional plate frame type membrane distillation assembly is not added with the turbulence element 23, as shown in FIG. 1, the flow channel is not provided with the turbulence element 23, and the flow channel is a straight flow channel. The flow channel is straight, and the flow channel is not provided with the turbulence element 23. The flow channel is straight, and the flow channel is not provided with the turbulence element 23. Figure 12As shown, except for a small part of vortex flow at the entrance section, most of the fluid flows out of the plate frame outlet in a direct approximate straight line, with short flow dead angle and flow distance, and short flow path.

[0097] The thin film distillation assembly with membrane support and turbulence air gap of the embodiment, as shown, has vortex flow from the entrance section to the outlet section due to the addition of the turbulence element 23 and the membrane support element 22, with reduced flow dead angle, sufficient fluid exchange, vortex on the membrane surface, increased turbulence degree of the membrane surface, and obviously improved flow condition of the membrane surface, sufficient exchange of the fluid surface and the fluid interior, reduced influence of the concentration polarization phenomenon and the temperature polarization phenomenon, increased temperature near the membrane surface, and reduced concentration near the membrane surface. Figure 13 As shown, except for a small part of vortex flow at the entrance section, most of the fluid flows out of the plate frame outlet in a direct approximate straight line, with short flow dead angle and flow distance, and short flow path.

[0098] It can be understood that the above embodiments are only exemplary embodiments for illustrating the principles of the present application, and the present application is not limited thereto. Various modifications and improvements can be made by those skilled in the art without departing from the spirit and essence of the present application, and these modifications and improvements are also considered to be within the protection scope of the present application.

Claims

1. A turbogap membrane distillation module with membrane support comprising a cover plate (1), a plate frame (21), a condensation plate (3), a gas gap spacer (4) and a membrane (5), characterized in that, The assembly further comprises a membrane support element (22) and a plurality of turbulence elements (23), The membrane support element and the turbulence elements are both mounted on the plate frame, and the membrane support element is between the turbulence elements and the membrane, and the turbulence elements are provided with a plurality of turbulence holes (25) uniformly distributed thereon.

2. The turbulent gas gap thin film distillation assembly with membrane support of claim 1, wherein, The turbulence elements (23) are arc-shaped or elliptical.

3. The turbulated gas gap thin film distillation assembly with membrane support of claim 1, wherein, The turbulence elements (23) are elliptical, the length of the major axis of the ellipse ranges between the inner width and the outer width of the plate frame, and the length of the minor axis is 1 / 6-1 / 4 of the length of the major axis.

4. The turbulated gas gap thin film distillation assembly with membrane support of claim 3, wherein, The cross section of the turbulence element (23) is a rectangle with rounded corners, the width of the rectangle is between 5-15mm, and the radius of the rounded corner is between 1mm and half of the width of the rectangle.

5. The turbulated gas gap thin film distillation assembly with membrane support of claim 4, wherein, The maximum height of the rectangle is equal to the height of the plate frame minus twice the height of the membrane support element, and the minimum height is 0.7 times the maximum height.

6. The turbulated gas gap thin film distillation assembly with membrane support of claim 3, wherein, The diameter of the turbulence hole (25) is 1 / 2-2 / 3 of the height of the rectangular cross section of the turbulence element along the hole axis direction, and the center distance of the turbulence hole is 30-80mm.

7. The turbulated gas gap thin film distillation assembly with membrane support of claim 1 wherein, The turbulence elements (23) are spaced apart in the plate frame in a convex manner, and the contact between the turbulence elements and the plate frame is equidistant, and the spacing distance is 30-160mm.

8. The membrane supported turbulent gap distillation assembly of any one of claims 1 to 7, wherein, The membrane support element (22) is a prismatic support net, the top angle of the rhombus is between 30°-90°, and the lateral spacing of the rhombic support net is between 10-30mm. The cross section of the rhombic support net is a semi-cylindrical shape, the diameter of the cylinder is less than 3mm, and the cylinder side is outwardly contacted with the membrane.

9. The turbulated gas gap thin film distillation assembly with membrane support of claim 8, wherein, The rhombic support net comprises two pieces, namely a first rhombic support net and a second rhombic support net, which are respectively located on both sides of the plate frame, and the first rhombic support net on one side of the plate frame is integrally formed with the plate frame (21).

10. The turbulent gas gap thin film distillation assembly with membrane support of claim 8, wherein, The second rhombic support net on the other side of the plate frame is separately formed, and the edge of the second rhombic support net is provided with a solid frame.

11. The turbulated gas gap thin film distillation assembly with membrane support of claim 8, wherein, The assembly further comprises a plurality of support bodies (24) uniformly distributed, one end of which is connected with the membrane support element, and the other end of which is located in the flow channel.

12. The turbulated gas gap thin film distillation assembly with membrane support of claim 11, wherein, The diameter of the support body (24) is 5-30mm, the lateral uniform distribution distance is 50-200mm, and the longitudinal uniform distribution distance is 100-400mm.

13. The turbulated gas gap thin film distillation assembly with membrane support of claim 11, wherein, The lower end of the plate frame (21) is provided with a first boss, and the first boss is provided with a first opening.

14. The turbulated gas gap thin film distillation assembly with membrane support of claim 13, wherein, The lower end of the air gap baffle (4) is provided with a second boss, and the second boss is provided with a second opening, and the air gap boss is further provided with a groove centered on the second opening.

15. The turbulated gas gap thin film distillation assembly with membrane support of claim 14, wherein, The groove is an elongated groove, the depth of which is 1mm, the length direction of which is 3-5mm, and the width direction of which is 40-100mm.

16. The turbulated gas gap thin film distillation assembly with membrane support of claim 14, wherein, The lower end of the condensing plate (3) is provided with a third opening, and the third opening corresponds to the opening position of the second boss.

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