Membrane distillation concentration recycling device for high-salt industrial wastewater

Abstract

The invention relates to the technical field of high-salt industrial wastewater treatment, in particular to a membrane distillation concentration recycling device for high-salt industrial wastewater, which comprises a base main body, a wastewater tank is fixedly connected to the front end of the top of the base main body, a pretreatment unit is arranged on the outer side of the wastewater tank, and a heating tank is arranged on the outer side of the pretreatment unit. Compared with an existing membrane distillation concentration recycling device, the problems that most of water flow channels of a traditional membrane distillation device are designed to be straight channels, water flow makes insufficient contact with a hydrophobic membrane, a laminar flow state is likely to be formed, a large number of mass transfer dead angles exist, the water vapor permeation rate is low, the fresh water output efficiency is low, and the like are solved. The problems that suspended impurities and salt ions in wastewater are easy to deposit on the surface of a membrane, membrane holes are blocked, the membrane flux is rapidly attenuated, frequent chemical cleaning is needed, the operation and maintenance cost is increased, and the service life of the membrane is shortened are solved.

Description

Technical Field

[0001] This invention relates to the field of high-salt industrial wastewater treatment technology, specifically to a membrane distillation concentration and reuse device for high-salt industrial wastewater. Background Technology

[0002] In recent years, zero-discharge technology for wastewater has matured and is being gradually promoted and applied nationwide, involving multiple fields such as thermal power, coal chemical industry, printing and dyeing, pharmaceuticals, pesticides and fertilizers, and oil and gas extraction. From the current main approaches to high-salinity wastewater treatment, regardless of the treatment process used, the high-concentration wastewater is ultimately sent to a crystallizer for re-evaporation to form crystalline salt, thereby achieving zero wastewater discharge.

[0003] High-salinity wastewater often presents challenges due to its large volume and low salt concentration, resulting in high investment and operating costs for the treatment process and significant energy consumption in the subsequent evaporation process. Therefore, it is necessary to first reduce the volume by increasing the salt content and concentration.

[0004] Currently, the mainstream treatment technologies for high-salinity industrial wastewater mainly include traditional evaporation crystallization technology, membrane separation technology, and novel membrane distillation technology, but all of these technologies have significant limitations.

[0005] Multi-effect evaporation has extremely high energy consumption, and the equipment is susceptible to corrosion and severe scaling from high-salt wastewater, requiring frequent shutdowns for cleaning, resulting in high operation and maintenance costs. Although mechanical vapor recompression has lower energy consumption than multi-effect evaporation, it requires a large initial investment, has stringent requirements for feed water quality, and suspended impurities in the wastewater can easily cause evaporator blockage. It is only suitable for pre-treated low-turbidity, high-salt wastewater.

[0006] At high salt concentrations, the osmotic pressure of wastewater increases sharply, leading to a surge in system operating pressure and an exponential increase in energy consumption. At the same time, high-salt environments are prone to membrane fouling and degradation, resulting in rapid membrane flux decline, shortened lifespan, and the inability to treat near-saturated high-salt wastewater, thus limiting the concentration limit.

[0007] Membrane distillation technology, as a novel separation technology based on "vapor pressure difference drive," has become an ideal technology for the concentration and reuse of high-salinity wastewater due to its advantages such as low operating temperature, high rejection rate, and ability to treat saturated brine. However, existing membrane distillation concentration and reuse devices still have the following key technical defects that limit their industrial application. Traditional membrane distillation devices mostly have straight-channel water flow designs, resulting in insufficient contact between the water flow and the hydrophobic membrane, easily forming a laminar flow state, and creating a large number of mass transfer dead zones. This leads to slow water vapor permeation rates, low freshwater production efficiency, and the easy deposition of suspended impurities and salt ions in the wastewater on the membrane surface, clogging the membrane pores and causing rapid decline in membrane flux. Frequent chemical cleaning is required, which not only increases operation and maintenance costs but also shortens the membrane's lifespan. Therefore, improving existing membrane distillation concentration and reuse devices and designing a new type of membrane distillation concentration and reuse device for high-salinity industrial wastewater to solve the above-mentioned technical defects and improve the overall practicality of the membrane distillation concentration and reuse device is particularly important. Summary of the Invention

[0008] The purpose of this invention is to provide a membrane distillation concentration and reuse device for high-salt industrial wastewater. This invention solves the problems of traditional membrane distillation devices, which mostly use straight-channel designs for water flow. This results in insufficient contact between the water flow and the hydrophobic membrane, easily forming a laminar flow state, creating a large number of mass transfer dead zones, leading to slow water vapor permeation rates, low freshwater production efficiency, and the easy deposition of suspended impurities and salt ions in the wastewater on the membrane surface, clogging the membrane pores, causing rapid decline in membrane flux, requiring frequent chemical cleaning, which not only increases operation and maintenance costs but also shortens the membrane's service life.

[0009] To achieve the above objectives, the present invention provides the following technical solution:

[0010] A membrane distillation concentration and reuse device for high-salt industrial wastewater includes a base body, a wastewater tank fixedly connected to the front end of the top of the base body, a pretreatment unit provided on the outside of the wastewater tank, a heating tank provided on the outside of the pretreatment unit, and a treatment unit provided on the outside of the heating tank.

[0011] The pretreatment unit is used to remove impurities and soften the hardness of high-salt industrial wastewater. The pretreatment unit includes a first treatment tank fixedly connected to the top of the base body and located outside the wastewater tank, and a second treatment tank fixedly connected to the outside of the first treatment tank and located on the top of the base body.

[0012] The first treatment tank is equipped with a filter assembly inside, which is used to separate impurities carried by the wastewater.

[0013] The second processing tank is equipped with an internal filter;

[0014] The processing unit is used to separate and treat high-salt industrial wastewater. The processing unit includes a heat-insulating tank that is fixedly connected to the top of the base body and located outside the heating tank. The heat-insulating tank is equipped with a separation component inside.

[0015] The separation assembly includes a connecting shell fixedly connected to the inside of the heat insulation tank. A connecting cylinder is fixedly connected to the top of the connecting shell. Multiple sets of guide cylinders are fixedly connected inside the connecting shell. A connecting pipe is fixedly connected to the bottom of the guide cylinder and inside the connecting shell. A first drain pan is fixedly connected to the bottom of the connecting pipe. Multiple sets of first drain pans are connected through second drain pans. A fixing cylinder is fixedly connected to the top of the first drain pan. A fixing pipe is fixedly connected to the top of the inside of the fixing cylinder. A first spiral block is fixedly connected inside the fixing pipe. Multiple sets of dividing blocks are fixedly connected to the bottom of the fixing pipe and inside the fixing cylinder. A guide vane is rotatably connected inside the fixing cylinder and below the fixing pipe.

[0016] As a preferred embodiment of the present invention, a second spiral block is fixedly connected inside the guide cylinder, and a third spiral block is fixedly connected inside the connecting cylinder. The first spiral block, the second spiral block, and the third spiral block all form spiral acceleration grooves inside the fixed tube, the guide cylinder, and the connecting cylinder.

[0017] As a preferred embodiment of the present invention, the guide cylinder has a structure design that is larger at the top and smaller at the bottom, the connecting pipe extends into the interior of the fixed pipe, a bracket is fixedly connected to the outside of the fixed cylinder, the bracket is fixedly connected to the first drainage tray, and the fixed cylinder is connected to the first drainage tray through the bracket.

[0018] As a preferred embodiment of the present invention, a hydrophobic porous membrane is fixedly connected inside both the first and second hydrophobic trays, and drainage holes are provided on the outer sides of both the first and second hydrophobic trays. Multiple sets of through grooves are provided on the outer side of the fixed cylinder.

[0019] As a preferred embodiment of the present invention, a connecting ring is fixedly connected to the outer side of both the first and second hydrophobic trays, and an annular semiconductor cooling chip is fixedly connected to the inside of the connecting ring. Conductive plates are fixedly connected to the bottom and top of the connecting ring, and multiple sets of the annular semiconductor cooling chips are respectively attached to the surface of the first and second hydrophobic trays.

[0020] As a preferred embodiment of the present invention, the guide vane is rotatably connected to the first spiral block, and multiple sets of the segmented blocks are distributed at equal intervals inside the fixed tube.

[0021] As a preferred embodiment of the present invention, the filtration assembly includes a filter cylinder rotatably connected to the inside of the first processing tank, a filter screen fixedly connected to the outside of the filter cylinder, a cleaning assembly provided inside the filter cylinder, and a connecting seat fixedly connected to the bottom of the first processing tank and located at the bottom of the filter cylinder, and the filter cylinder and the connecting seat are rotatably connected.

[0022] As a preferred embodiment of the present invention, the cleaning assembly includes a fixed base fixedly connected to the top of the inside of the first treatment tank, a rotating frame rotatably connected to the bottom of the fixed base and inside the filter cylinder, rotating plates rotatably connected to all four sides inside the rotating frame, and cleaning brushes fixedly connected to both ends of the rotating plates.

[0023] As a preferred embodiment of the present invention, a bevel gear disk is rotatably connected inside the fixed base and outside the filter cylinder, the bevel gear disk is fixedly connected to the filter cylinder, a bevel gear is meshed on the outside of the bevel gear disk, a first drive motor is fixedly connected inside the first treatment tank and outside the bevel gear, the drive end of the first drive motor is fixedly connected to the bevel gear, and the filter cylinder is rotatably connected to the fixed base.

[0024] As a preferred embodiment of the present invention, an internal gear ring is fixedly connected inside the fixed base and at the top of the rotating frame. The rotating frame extends into the interior of the internal gear ring and is rotatably connected to a drive gear. The drive gear meshes with the internal gear ring and is fixedly connected to the rotating plate. A second drive motor is fixedly connected inside the first processing tank. The drive end of the second drive motor extends into the interior of the first processing tank and is fixedly connected to the rotating frame. A receiving groove is provided inside the connecting base, and an electric closing block is fixedly connected to the top of the receiving groove.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] 1. In this invention, through the design of the separation components, the spiral blocks inside the connecting cylinder, guide cylinder, and fixed pipe form a continuous spiral acceleration groove, guiding the wastewater to form high-intensity turbulence, increasing the contact area between the water flow and the hydrophobic porous membrane, accelerating water vapor permeation, and improving the freshwater production rate compared to the traditional straight-channel structure. The guide cylinder's design, wider at the top and narrower at the bottom, enables directional water flow convergence, the connecting pipe precisely guides the water into the fixed pipe, and the segmented blocks evenly distribute the water flow. Combined with the dispersing effect of the through groove in the fixed cylinder, this ensures that the water flow fully covers the surface of the hydrophobic membrane, eliminating mass transfer dead zones. Multiple sets of hydrophobic discs work synchronously and efficiently, and the guide vanes rotate in conjunction with the first spiral block. Next, the water flow is further dispersed and its direction optimized, allowing the water to impact the membrane surface at the optimal angle. This strengthens the driving force of the vapor pressure difference, ensuring stable water vapor permeation efficiency. The high-speed turbulent water flow continuously washes the hydrophobic porous membrane surface, reducing the deposition of salt ions and impurities around the membrane pores. In conjunction with the drainage holes, high-salt concentrate is quickly discharged, preventing scaling caused by excessive salt concentration on the membrane surface. The annular semiconductor cooling plate on the connecting ring cools the membrane evenly through the conduction plate, causing the water vapor on the permeate side to condense into liquid fresh water instantly, preventing water vapor from accumulating and forming a liquid film that blocks the membrane pores. At the same time, a stable vapor pressure difference is maintained on both sides of the membrane, ensuring continuous and efficient separation.

[0027] 2. In this invention, through the design of the filtration assembly, the first drive motor drives the filter cylinder to rotate at high speed via bevel gear transmission. Centrifugal force is used to gather suspended particles and flocs in the wastewater toward the filter screen. The filter screen accurately intercepts impurities with a particle size ≥1μm, achieving an impurity interception rate of over 98%. This prevents subsequent pipe and membrane pore blockage. The rotating design of the filter cylinder can handle high-turbidity wastewater. Even with fluctuations in the impurity content of the influent, impurities can still be quickly separated by centrifugal force, ensuring stable pretreatment results and providing clean preconditions for the hardness softening process in the second treatment tank. The second drive motor drives the rotating frame to revolve, and the drive gear meshes with the internal gear ring. The rotating plate rotates, and the cleaning brush forms a cleaning trajectory that covers the entire area and intensifies cleaning in certain areas. This can thoroughly remove stubborn impurities attached to the filter screen surface, avoiding flow reduction caused by filter screen clogging. The intercepted impurities fall into the receiving tank of the connecting seat under the action of gravity and centrifugal force. The electric closing block can open at regular intervals to discharge in batches, preventing impurities from accumulating at the bottom of the treatment tank and ensuring smooth wastewater flow. Through efficient impurity interception and automatic cleaning to prevent clogging, the suspended solids content of the pretreated wastewater is significantly reduced. This reduces the risk of membrane pore clogging and pipeline wear in subsequent separation components from the source, indirectly extending the overall operating cycle of the membrane distillation system and reducing comprehensive operation and maintenance costs. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 This is a schematic diagram of the processing unit structure of the present invention;

[0030] Figure 3 This is a schematic diagram of the invention and the processing unit structure;

[0031] Figure 4 This is a schematic diagram of the structure of the separate component of the present invention;

[0032] Figure 5 This is a schematic diagram of the guide cylinder structure of the present invention;

[0033] Figure 6 This is a schematic diagram of the first hydrophobic disc structure of the present invention;

[0034] Figure 7 This is a schematic diagram of the fixed cylinder structure of the present invention;

[0035] Figure 8 This is a schematic diagram of the internal structure of the first hydrophobic tray of the present invention;

[0036] Figure 9 This is a schematic diagram of the internal structure of the fixed tube of the present invention;

[0037] Figure 10 This is a schematic diagram of the filter component structure of the present invention;

[0038] Figure 11 This is a schematic diagram of the connector structure of the present invention;

[0039] Figure 12 This is a schematic diagram of the cleaning component structure of the present invention;

[0040] Figure 13 This is a schematic diagram of the rotating frame structure of the present invention.

[0041] In the diagram: 1. Base body; 2. Wastewater tank; 3. Heating tank; 4. First treatment tank; 5. Second treatment tank; 6. Filter assembly; 7. Filter; 8. Insulation tank; 9. Separation assembly; 10. Connecting shell; 11. Connecting cylinder; 12. Guide cylinder; 13. Connecting pipe; 14. First drain pan; 15. Second drain pan; 16. Fixing cylinder; 17. Fixing pipe; 18. First spiral block; 19. Dividing block; 20. Guide vane; 21. Second spiral block; 22. Third spiral block; 23. 24. Support; 25. Hydrophobic porous membrane; 26. Drain hole; 27. Through groove; 28. Connecting ring; 29. ​​Ring-shaped semiconductor refrigeration chip; 30. Filter cartridge; 31. Filter screen; 32. Cleaning assembly; 33. Connecting seat; 34. Fixing seat; 35. Rotating frame; 36. Rotating plate; 37. Cleaning brush; 38. Bevel gear disk; 39. Bevel gear; 40. First drive motor; 41. Internal gear ring; 42. Drive gear; 43. Second drive motor; 44. Receiving groove; 45. Electric closing block. Detailed Implementation

[0042] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0043] Example:

[0044] Please see Figures 1-13 The present invention provides a technical solution:

[0045] A membrane distillation concentration and reuse device for high-salt industrial wastewater includes a base body 1, a wastewater tank 2 fixedly connected to the front end of the top of the base body 1, a pretreatment unit provided on the outside of the wastewater tank 2, a heating tank 3 provided on the outside of the pretreatment unit, and a treatment unit provided on the outside of the heating tank 3.

[0046] The pretreatment unit is used to remove impurities and soften the hardness of high-salt industrial wastewater. The pretreatment unit includes a first treatment tank 4 fixedly connected to the top of the base body 1 and located outside the wastewater tank 2, and a second treatment tank 5 fixedly connected to the outside of the first treatment tank 4 and located on the top of the base body 1.

[0047] The first treatment tank 4 is equipped with a filter assembly 6, which is used to separate and treat impurities carried by the wastewater.

[0048] The second processing tank 5 is equipped with a filter 7 inside;

[0049] The treatment unit is used to separate and treat high-salt industrial wastewater. The treatment unit includes an insulated tank 8 that is fixedly connected to the top of the base body 1 and located outside the heating tank 3. The inside of the insulated tank 8 is equipped with a separation component 9.

[0050] The separation assembly 9 includes a connecting shell 10 fixedly connected to the inside of the heat insulation tank 8. A connecting cylinder 11 is fixedly connected to the top of the connecting shell 10. Multiple sets of guide cylinders 12 are fixedly connected inside the connecting shell 10. A connecting pipe 13 is fixedly connected to the bottom of the guide cylinder 12 and inside the connecting shell 10. A first drain pan 14 is fixedly connected to the bottom of the connecting pipe 13. Multiple sets of first drain pans 14 are connected through second drain pans 15. A fixed cylinder 16 is fixedly connected to the top of the first drain pan 14. A fixed pipe 17 is fixedly connected to the top of the inside of the fixed cylinder 16. A first spiral block 18 is fixedly connected to the inside of the fixed pipe 17. Multiple sets of dividing blocks 19 are fixedly connected to the bottom of the fixed pipe 17 and inside the fixed cylinder 16. A guide vane 20 is rotatably connected to the inside of the fixed cylinder 16 and below the fixed pipe 17.

[0051] Furthermore, a second spiral block 21 is fixedly connected inside the guide cylinder 12, and a third spiral block 22 is fixedly connected inside the connecting cylinder 11. The first spiral block 18, the second spiral block 21, and the third spiral block 22 all form spiral acceleration grooves inside the fixed pipe 17, the guide cylinder 12, and the connecting cylinder 11. These spiral acceleration grooves guide the high-salt wastewater to flow directionally along a spiral trajectory, completely breaking the traditional laminar flow state and forming high-intensity turbulence. This flow mode not only increases the contact area between the wastewater and the hydrophobic porous membrane 24 compared to laminar flow, but also increases the contact area through high-frequency scouring. The enhanced water vapor permeation dynamics directly increase the freshwater production rate. Simultaneously, the spiral structure ensures uniform flow velocity distribution within the connecting cylinder 11, guide cylinder 12, and fixed pipe, avoiding dead zones caused by excessively low local flow velocities. This allows multiple sets of first and second hydrophobic discs 14 to operate synchronously and efficiently, ensuring stable overall treatment efficiency. The continuous scouring force generated by the high-speed spiral water flow effectively removes salt ions and minute impurities adhering to the membrane surface, reducing membrane pore blockage and scale deposition. This, combined with the filtration and softening functions of the pretreatment unit, creates a synergistic anti-scaling effect, enhancing the membrane's... The extended chemical cleaning cycle, coupled with the turbulent flow that shortens the residence time of salt ions on the membrane surface, prevents increased concentration polarization, maintains a stable vapor pressure difference across the membrane, ensures continuous and efficient membrane distillation, and reduces maintenance costs. The guide tube 12 features a variable diameter structure (larger at the top, smaller at the bottom), and the spiral acceleration groove cleverly offsets the velocity loss caused by the variable diameter, allowing water to flow smoothly into the connecting pipe 13. Fluid resistance is reduced compared to traditional straight channels, decreasing drive energy consumption. Simultaneously, the spiral flow allows for more complete heat exchange between wastewater and the heating medium, improving heat utilization and indirectly reducing the heating tank's operating costs. The energy consumption of 3 aligns with the design goal of low-energy treatment of high-salinity wastewater. The high-speed turbulent flow characteristics significantly improve the device's tolerance to fluctuations in influent water quality, such as instantaneous changes in impurity content and salt concentration, effectively resisting shock loads and avoiding system pressure fluctuations caused by local blockages. In addition, the uniform flow velocity distribution reduces local wear on the hydrophobic disc and membrane materials. Combined with the device's anti-corrosion and anti-scaling design, the overall service life of the separation component 9 is extended, ensuring long-term stable operation of the device under high-salinity and high-impurity conditions, providing reliable support for zero discharge of high-salinity industrial wastewater.

[0052] The guide cylinder 12 has a design that is wider at the top and narrower at the bottom. The connecting pipe 13 extends into the interior of the fixed pipe 17. A bracket 23 is fixedly connected to the outside of the fixed cylinder 16, and the bracket 23 is fixedly connected to the first drainage tray 14. The fixed cylinder 16 is connected to the first drainage tray 14 through the bracket 23. The guide vane 20 is rotatably connected to the first spiral block 18. Multiple sets of segmented blocks 19 are evenly distributed inside the fixed pipe 17. The upper opening of the guide cylinder 12 is large, which facilitates the collection of wastewater transported by the connecting cylinder 11, achieving efficient flow collection. The lower part narrows to reduce the flow cross-section, which, together with the spiral acceleration groove, naturally increases the water flow velocity, forming a directional convergence effect, avoiding the mass transfer dead zone caused by water flow dispersion, and directly guiding the water flow. The accelerated water flow inside the cylinder 12 is introduced into the core area of ​​the fixed pipe 17 to reduce leakage and resistance loss at the pipe connection, ensuring that the water flow is in full contact with the first spiral block 18 and the dividing block 19, thereby enhancing the spiral turbulence effect. The dividing block 19 evenly divides the water flow in the fixed pipe, making the water flow form multiple uniform spiral streams. Each stream can make efficient contact with the hydrophobic porous membrane 24, avoiding local water flow concentration or uneven flow velocity, and ensuring that the mass transfer efficiency of multiple hydrophobic discs is consistent. When the water flow impacts the guide vane 20, it drives it to rotate, further dispersing the water flow and guiding the flow direction, so that the water flow is evenly distributed on the surface of the first hydrophobic disc 14 when passing through the through groove 26 of the fixed cylinder 16, thereby improving the membrane contact coverage.

[0053] Secondly, both the first and second hydrophobic trays 14 and 15 are internally connected to hydrophobic porous membranes 24. Drainage holes 25 are provided on the outer sides of both trays 14 and 15. Multiple sets of through-grooves 26 are provided on the outer side of the fixed cylinder 16. The hydrophobic porous membrane 24 only allows water vapor to pass through, strictly blocking liquid water and salt ions. The theoretical salt rejection rate is as high as 100%, ensuring the purity of the produced water, which can be directly reused in scenarios such as boiler feedwater. The hydrophobic properties of the membrane prevent high-salt wastewater from wetting the membrane pores. Even when treating concentrated water with a salt content of over 50,000 mg / L, it can maintain a stable vapor pressure difference, supporting wastewater concentration to over 250,000 mg / L. After membrane distillation, the retained salt ions form a concentrated liquid, which is drained through the drainage holes on the outer side of the hydrophobic trays. The orifice 25 allows for rapid discharge, preventing the concentrate from stagnating on the membrane surface and causing excessive salt concentration and scaling. The drain orifice 25 also quickly guides the fluid within the drainage tray, preventing pressure fluctuations caused by localized liquid accumulation. This ensures the synchronous and stable operation of multiple drainage trays, reducing membrane damage caused by uneven pressure. The directional discharge of the concentrate facilitates subsequent centralized collection into the crystallization system, while also reducing the cleaning difficulty caused by liquid accumulation on the membrane surface and extending the membrane cleaning cycle. Water flowing through the fixed cylinder 16 is evenly distributed to the membrane surface of the first drainage tray 14 via multiple channels 26, preventing concentrated water flow from impacting localized membrane surfaces and ensuring that every part of the membrane fully participates in the mass transfer process, eliminating mass transfer dead zones. The distribution of the channels 26, along with the guiding effect of the spiral acceleration channel and guide vanes 20, allows the water to flow evenly in a turbulent state. The membrane surface enhances both the flushing and scale prevention effect and improves water vapor permeation efficiency. The through-channel 26 provides a smooth flow path for water, preventing stagnation or eddies between the fixed cylinder 16 and the drainage tray, thus reducing system operating energy consumption. The layout of multiple sets of first drainage trays 14 and second drainage trays 15 significantly increases the effective contact area of ​​the membrane. Combined with the turbulent water flow design, it accelerates water vapor permeation and increases the freshwater production per unit time. The hydrophobic porous membrane 24, with its strong hydrophobic properties, constructs a separation barrier that blocks liquid water and selectively allows water vapor to permeate, achieving precise separation of water and salt. The porous structure of the membrane only allows water molecules in high-salt wastewater to be converted into water vapor and permeate under the action of vapor pressure difference, while non-volatile substances such as salt ions and suspended impurities are firmly blocked at the membrane feed. On the side, the theoretical salt rejection rate is as high as 100%. This precise separation characteristic ensures excellent product water quality, with a conductivity consistently below 50 μS / cm. It can directly meet the feed water requirements of boiler feedwater EDI systems, achieving resource recycling without additional deep treatment. This perfectly meets the core needs of reducing and reusing high-salt wastewater. The separation function works synergistically with other structures in the device to further improve separation efficiency. The through-channel 26 on the outside of the fixed cylinder 16 achieves uniform water distribution, allowing the water flow to smoothly and comprehensively cover the membrane surface, avoiding local water flow concentration or gaps, ensuring that the effective separation area of ​​the membrane is fully utilized, and eliminating mass transfer dead zones. The acceleration effect of the guide cylinder 12 and the guiding effect of the guide vanes 20 cause the water flow to scour the membrane surface in a turbulent state, which enhances the driving force of water vapor permeation.This design reduces the retention and deposition of salt ions around the membrane pores, ensuring unobstructed membrane separation channels. Simultaneously, the drain hole 25 quickly discharges the high-salt concentrate retained by the membrane, preventing prolonged accumulation of concentrate on the membrane surface and thus avoiding excessively high salt concentrations. This maintains a stable vapor pressure difference across the membrane, ensuring continuous and efficient separation.

[0054] Furthermore, connecting rings 27 are fixedly connected to the outer sides of both the first and second hydrophobic trays 14 and 15, respectively. Ring-shaped semiconductor cooling plates 28 are fixedly connected inside the connecting rings 27. Conductive plates are fixedly connected to the bottom and top of the connecting rings 27. Multiple sets of ring-shaped semiconductor cooling plates 28 are respectively attached to the surfaces of the first and second hydrophobic trays 14 and 15. The cooling plates directly adhere to the surfaces of the first and second hydrophobic trays 14 and 15, rapidly reducing the temperature of the hydrophobic trays through the semiconductor temperature difference effect. This creates a low-temperature environment on the membrane permeation side (freshwater side), forming a significant temperature difference with the heated high-salt wastewater on the feed side. This strengthens the vapor pressure difference driving force, accelerates wastewater vapor permeation and condensation, increases the freshwater production rate, and expands the cooling capacity of the conductive plates above and below the connecting rings 27. The area of ​​the cooling plate evenly transfers the cooling energy to the entire hydrophobic tray, avoiding condensation dead zones caused by insufficient local cooling. This ensures consistent condensation across the entire surface of the hydrophobic porous membrane 24, preventing uncondensed water vapor from flowing back and affecting the separation effect. The efficient cooling of the cooling plate instantly condenses water vapor on the permeate side into liquid fresh water, preventing water vapor from accumulating around the membrane pores and forming a liquid film that blocks the pores, or causing salt ions to deposit with the water vapor due to untimely condensation. This significantly reduces the risk of membrane fouling and extends the membrane cleaning cycle. Precise temperature control maintains a constant temperature on the permeate side, preventing temperature fluctuations from causing unstable vapor pressure differences across the membrane. This ensures continuous high efficiency in the membrane distillation process, while avoiding low-temperature damage or high-temperature aging, thus extending the service life of the hydrophobic porous membrane 24 and the hydrophobic tray.

[0055] Furthermore, the filter assembly 6 includes a filter cylinder 29 rotatably connected inside the first treatment tank 4. A filter screen 30 is fixedly connected to the outside of the filter cylinder 29. A cleaning assembly 31 is provided inside the filter cylinder 29. A connecting seat 32 is fixedly connected to the bottom of the filter cylinder 29 inside the first treatment tank 4. The filter cylinder 29 is rotatably connected to the connecting seat 32. The cleaning assembly 31 includes a fixed seat 33 fixedly connected to the top of the first treatment tank 4. A rotating frame 34 is rotatably connected to the bottom of the fixed seat 33 inside the filter cylinder 29. Rotating plates 35 are rotatably connected to all four sides inside the rotating frame 34. Cleaning brushes 36 are fixedly connected to both ends of the rotating plates 35. The filter cylinder 29 is rotatably connected to the connecting seat 32. During operation, the filter cylinder 29 rotates with the drive mechanism to generate centrifugal force, causing suspended impurities and particulate matter in the high-salt wastewater to gather to the outside of the filter screen 30 under centrifugal force, avoiding local accumulation of impurities on the filter screen surface. At the same time, it allows water to penetrate the filter screen evenly, ensuring full utilization of the effective filtration area of ​​the filter screen and increasing the impurity interception rate by more than 30%. It can efficiently remove particles with a diameter ≥1μm. Suspended pollutants are filtered out by a filter screen 30 fixed to the outside of the filter cylinder 29. This screen specifically intercepts solid impurities and flocs carried by the wastewater, preventing these pollutants from entering the subsequent heating tank 3 and separation component 9. This prevents pipe blockage, reduced heating efficiency, and membrane pore blockage, providing a clean inlet water environment for the membrane distillation process. The rotating frame 34 drives the rotating plate 35 and cleaning brush 36 to rotate inside the filter cylinder 29. The cleaning brush 36 closely adheres to the inner wall of the filter screen 30, continuously scraping away impurities trapped by the filter screen during rotation. This prevents flow attenuation caused by filter screen pore blockage. The connecting seat 32 is fixed to the bottom of the first treatment tank 4, providing stable support for the filter cylinder 29. This ensures that the filter cylinder 29 does not shake or shift during high-speed rotation, improving the stability of the component operation. This adapts to the complex working conditions of high-salt wastewater with high flow rate and high impurity content, and avoids structural damage caused by water flow impact.

[0056] Furthermore, a bevel gear disk 37 is rotatably connected inside the fixed base 33 and located outside the filter cartridge 29. The bevel gear disk 37 is fixedly connected to the filter cartridge 29. A bevel gear 38 is meshed with the outer side of the bevel gear disk 37. A first drive motor 39 is fixedly connected inside the first treatment tank 4 and located outside the bevel gear 38. The drive end of the first drive motor 39 is fixedly connected to the bevel gear 38. The filter cartridge 29 is rotatably connected to the fixed base 33. An internal gear ring 40 is fixedly connected inside the fixed base 33 and located at the top of the rotating frame 34. A drive gear 41 is rotatably connected to the rotating frame 34 extending into the interior of the internal gear ring 40. The drive gear 41 meshes with the internal gear ring. The first processing tank 4 is connected by a meshing gear 40. The drive gear 41 is fixedly connected to the rotating plate 35. The second drive motor 42 is fixedly connected inside the first processing tank 4. The drive end of the second drive motor 42 extends into the first processing tank 4 and is fixedly connected to the rotating frame 34. The connecting seat 32 has a receiving groove 43 inside. An electric closing block 44 is fixedly connected to the top of the receiving groove 43. The first drive motor 39 meshes with the bevel gear disk 37 through the bevel gear 38, which smoothly transmits power to the filter cartridge 29. The transmission efficiency is high and the noise is low. This ensures that the filter cartridge 29 rotates at a uniform speed, generating a stable centrifugal force, which allows impurities to efficiently gather towards the filter screen 30, avoiding uneven filtration caused by speed fluctuations. The first drive motor 39 drives the filter cartridge 29 to rotate, while the second drive motor 42 independently drives the rotating frame 34. The speeds of both motors can be flexibly adjusted according to the impurity content of the wastewater. For example, with high impurity levels, filtration is increased, the filter cartridge 29's speed enhances centrifugal separation, and the cleaning brush 36's speed is simultaneously increased to strengthen impurity removal. This adapts to different water quality conditions. The second drive motor 42 drives the rotating frame 34 to revolve, while simultaneously driving the gear 41 to mesh with the inner gear ring 40, causing the rotating plate 35 to rotate. This causes the cleaning brush 36 to form a motion trajectory that revolves to cover the entire filter screen and rotates to enhance localized scouring, thoroughly removing stubborn impurities adhering to the filter screen surface, achieving a 100% cleaning coverage rate. The rotating plate 35's rotational characteristics... The cleaning brush 36 can adaptively adjust its contact angle according to the curvature of the filter screen surface, ensuring close contact with both the cylindrical surface and the edges of the filter screen, avoiding cleaning dead corners and solving the problems of uneven contact and incomplete cleaning in traditional fixed cleaning structures. Impurities intercepted by the filter cartridge 29 fall into the receiving groove 43 of the connecting seat 32 under the action of gravity and centrifugal force, preventing impurities from accumulating at the bottom of the first treatment tank 4 and causing pipe blockage, thus ensuring smooth wastewater flow. The electric closing block 44 can be opened or closed on a timed or as-needed basis, realizing centralized collection and batch discharge of impurities without the need for machine shutdown and disassembly. It only needs to be opened for discharge when impurities accumulate to a certain amount, greatly shortening maintenance downtime and reducing labor costs.

[0057] In this embodiment, the specific implementation scenario is as follows: In actual use, high-salt wastewater generated in industrial production is introduced into the wastewater tank 2 at the top of the base body 1 through pipelines to achieve wastewater buffering and homogenization, avoiding the impact of influent flow fluctuations on subsequent processes. The first drive motor 39 and the second drive motor 42 are started. After the wastewater enters the first treatment tank 4 from the wastewater tank 2, the bevel gear disk 37 and the bevel gear 38 mesh to drive the filter cylinder 29 to rotate at high speed. Centrifugal force is used to collect and intercept suspended particles, flocs, and other impurities in the wastewater onto the filter screen 30. Simultaneously, the rotating frame 34 drives the rotating plate 35 to revolve, and the drive gear 41 meshes with the inner gear ring 40 to achieve the rotation of the rotating plate 35. The cleaning brush 36 scrapes impurities from the inner wall of the filter screen from all directions, preventing clogging. The intercepted impurities fall into the receiving tank 43 of the connecting seat 32. The electric closing block 44 can open periodically according to the amount of impurities accumulated, discharging impurities in batches without stopping the machine for disassembly and cleaning, ensuring continuous operation of the pretreatment. The wastewater filtered by the first treatment tank 4 enters the second treatment tank 5, passing through the internal filter 7, which can be filled with weak acid resin or scale inhibitor carrier to remove calcium and magnesium ions, reduce the hardness of the wastewater, and reduce the risk of scaling in the subsequent membrane distillation process from the source, laying the foundation for high concentration. The pretreated wastewater enters the heating tank 3, which preferentially uses the factory's waste heat to heat the wastewater to 60-80℃, without consuming a large amount of additional electricity, meeting the requirements of low-carbon production. If the waste heat supply is insufficient, the auxiliary heating module can be activated to supplement the temperature, ensuring that the wastewater reaches the temperature conditions required for membrane distillation. Water enters the separation component 9 inside the heat-insulating tank 8 through the connecting cylinder 11. The spiral acceleration grooves in the connecting cylinder 11, guide cylinder 12, and fixed pipe 17 guide the wastewater to form high-intensity turbulence. With the structural design of the guide cylinder 12 (larger at the top and smaller at the bottom), the water flow is directionally accelerated and then precisely guided into the fixed pipe 17 through the connecting pipe 13. The dividing block 19 evenly distributes the water flow, and the guide vanes 20 further disperse the water flow. The water flows through the through groove 26 on the outside of the fixed cylinder 16 and evenly covers the surface of the hydrophobic porous membrane 24 in the first hydrophobic plate 14 and the second hydrophobic plate 15. At this time, a significant temperature gradient is formed on both sides of the membrane. The high-temperature wastewater on the feed side generates water vapor, which passes through the hydrophobic porous membrane 24. Salt ions and impurities are blocked. The annular semiconductor cooling chip 28 on the permeation side cools down rapidly through the conduction plate, causing the water vapor to condense instantly. The condensed freshwater is in liquid form, and its condensation efficiency is improved compared to traditional natural condensation. The condensed freshwater is collected and discharged through the drain hole 25 on the outside of the hydrophobic plate, and can be directly reused in boiler feedwater EDI systems, circulating cooling water makeup water, and other scenarios to achieve water resource recycling. The high-salt concentrate intercepted by the hydrophobic membrane is introduced into the subsequent evaporation and crystallization system for further solidification into industrial salt, achieving a closed loop of wastewater reduction and resource recycling. The speed of the first drive motor 39 and the second drive motor 42 can be flexibly adjusted according to different wastewater qualities. When treating high-turbidity wastewater, the rotation speed of the filter cartridge 29 is increased to enhance the centrifugal separation effect, and the speed of the cleaning brush 36 is increased simultaneously to enhance impurity removal. When treating high-salt-concentration wastewater, the heating temperature and the water flow velocity of the spiral acceleration tank are optimized to maintain a stable vapor pressure difference on both sides of the membrane.To ensure separation efficiency, the insulation design of the heat-insulating tank 8 reduces heat loss during operation, the directional cooling of the semiconductor refrigeration chip reduces energy consumption, and the automatic cleaning of the filter assembly 6 and the timed impurity removal function of the electric closing block 44 enable the device to operate continuously for more than 3 months, with no more than 4 chemical cleanings per year. This significantly reduces the intensity of manual maintenance and the cost of reagents. Compared with existing membrane distillation concentration and reuse devices, this invention improves the overall practicality of the membrane distillation concentration and reuse device through its design.

[0058] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A membrane distillation concentration and reuse device for high-salinity industrial wastewater, comprising a base body (1), characterized in that: Wastewater tank (2) is fixedly connected to the front end of the top of the base body (1). A pretreatment unit is provided on the outside of the wastewater tank (2). A heating tank (3) is provided on the outside of the pretreatment unit. A treatment unit is provided on the outside of the heating tank (3). The pretreatment unit is used to remove impurities and soften the hardness of high-salt industrial wastewater. The pretreatment unit includes a first treatment tank (4) fixedly connected to the top of the base body (1) and located outside the wastewater tank (2). A second treatment tank (5) is fixedly connected to the outside of the first treatment tank (4) and located on the top of the base body (1). The first treatment tank (4) is equipped with a filter assembly (6) inside, which is used to separate impurities carried by the wastewater. The second processing tank (5) is equipped with a filter (7) inside; The processing unit is used to separate and treat high-salt industrial wastewater. The processing unit includes a heat-insulating tank (8) that is fixedly connected to the top of the base body (1) and located outside the heating tank (3). The heat-insulating tank (8) is equipped with a separation component (9). The separation assembly (9) includes a connecting shell (10) fixedly connected to the inside of the heat insulation tank (8). A connecting cylinder (11) is fixedly connected to the top of the connecting shell (10). Multiple sets of guide cylinders (12) are fixedly connected inside the connecting shell (10). A connecting pipe (13) is fixedly connected to the bottom of the guide cylinder (12) and inside the connecting shell (10). A first drain pan (14) is fixedly connected to the bottom of the connecting pipe (13). Multiple sets of the first drain pans (14) are connected through a second drain pan (15). A fixed cylinder (16) is fixedly connected to the top of the first drain pan (14). A fixed pipe (17) is fixedly connected to the top of the inside of the fixed cylinder (16). A first spiral block (18) is fixedly connected inside the fixed pipe (17). Multiple sets of dividing blocks (19) are fixedly connected to the bottom of the fixed pipe (17) and inside the fixed cylinder (16). A guide vane (20) is rotatably connected inside the fixed cylinder (16) and below the fixed pipe (17).

2. The membrane distillation concentration and reuse device for high-salinity industrial wastewater according to claim 1, characterized in that: The guide cylinder (12) is fixedly connected to a second spiral block (21), and the connecting cylinder (11) is fixedly connected to a third spiral block (22). The first spiral block (18), the second spiral block (21) and the third spiral block (22) all form spiral acceleration grooves inside the fixed tube (17), the guide cylinder (12) and the connecting cylinder (11).

3. The membrane distillation concentration and reuse device for high-salinity industrial wastewater according to claim 1, characterized in that: The guide cylinder (12) has a structure design that is larger at the top and smaller at the bottom. The connecting pipe (13) extends into the interior of the fixed pipe (17). A bracket (23) is fixedly connected to the outside of the fixed cylinder (16). The bracket (23) is fixedly connected to the first drainage tray (14). The fixed cylinder (16) is connected to the first drainage tray (14) through the bracket (23).

4. A membrane distillation concentration and reuse device for high-salinity industrial wastewater according to claim 1, characterized in that: The first hydrophobic tray (14) and the second hydrophobic tray (15) are both fixedly connected to a hydrophobic porous membrane (24), and the first hydrophobic tray (14) and the second hydrophobic tray (15) are both provided with drainage holes (25) on the outside. The fixed cylinder (16) is provided with multiple sets of through grooves (26) on the outside.

5. A membrane distillation concentration and reuse device for high-salinity industrial wastewater according to claim 1, characterized in that: A connecting ring (27) is fixedly connected to the outer side of the first hydrophobic plate (14) and the second hydrophobic plate (15). An annular semiconductor cooling chip (28) is fixedly connected inside the connecting ring (27). Conductive plates are fixedly connected to the bottom and top of the connecting ring (27). Multiple sets of the annular semiconductor cooling chips (28) are respectively attached to the surface of the first hydrophobic plate (14) and the second hydrophobic plate (15).

6. A membrane distillation concentration and reuse device for high-salinity industrial wastewater according to claim 1, characterized in that: The guide vane (20) is rotatably connected to the first spiral block (18), and multiple sets of the segmented blocks (19) are distributed at equal intervals inside the fixed tube (17).

7. A membrane distillation concentration and reuse device for high-salinity industrial wastewater according to claim 1, characterized in that: The filter assembly (6) includes a filter cylinder (29) rotatably connected inside the first processing tank (4). A filter screen (30) is fixedly connected to the outside of the filter cylinder (29). A cleaning assembly (31) is provided inside the filter cylinder (29). A connecting seat (32) is fixedly connected to the bottom of the filter cylinder (29) inside the first processing tank (4). The filter cylinder (29) and the connecting seat (32) are rotatably connected.

8. A membrane distillation concentration and reuse device for high-salinity industrial wastewater according to claim 7, characterized in that: The cleaning assembly (31) includes a fixed seat (33) fixedly connected to the top of the inside of the first treatment tank (4). A rotating frame (34) is rotatably connected to the bottom of the fixed seat (33) and inside the filter cylinder (29). Rotating plates (35) are rotatably connected to all four sides inside the rotating frame (34). Cleaning brushes (36) are fixedly connected to both ends of the rotating plate (35).

9. A membrane distillation concentration and reuse device for high-salinity industrial wastewater according to claim 8, characterized in that: Inside the fixed base (33) and outside the filter cylinder (29), a bevel gear disk (37) is rotatably connected. The bevel gear disk (37) is fixedly connected to the filter cylinder (29). A bevel gear (38) is meshed with the outer side of the bevel gear disk (37). Inside the first processing tank (4) and outside the bevel gear (38), a first drive motor (39) is fixedly connected. The drive end of the first drive motor (39) is fixedly connected to the bevel gear (38). The filter cylinder (29) is rotatably connected to the fixed base (33).

10. A membrane distillation concentration and reuse device for high-salinity industrial wastewater according to claim 9, characterized in that: An internal gear ring (40) is fixedly connected inside the fixed seat (33) and at the top of the rotating frame (34). The rotating frame (34) extends into the interior of the internal gear ring (40) and is rotatably connected to a drive gear (41). The drive gear (41) meshes with the internal gear ring (40) and is fixedly connected to the rotating plate (35). A second drive motor (42) is fixedly connected inside the first processing tank (4). The drive end of the second drive motor (42) extends into the interior of the first processing tank (4) and is fixedly connected to the rotating frame (34). A receiving groove (43) is opened inside the connecting seat (32). An electric closing block (44) is fixedly connected to the top of the receiving groove (43).

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