Surrounding type fabric distillation system and method thereof

Abstract

The invention relates to the technical field of brine desalination, in particular to a surrounding type fabric distillation system and a method thereof. The system comprises an evaporation tank, a fiber net and a condensation plate, the fiber net and the condensation plate are both arranged in the evaporation tank, the fiber net and the condensation plate are coiled around the same axis, and the fiber net and the condensation plate are arranged in parallel at a constant normal interval; a gap is formed between the bottom of the fiber net and the bottom of the inner cavity of the evaporation tank. The problems that an existing flat plate type fabric distillation system is low in heat energy utilization rate, insufficient in evaporation driving force, limited in water production efficiency and the like are effectively solved, compared with a traditional flat plate structure, the effective area of a gas-liquid interface is greatly increased, and therefore the evaporation and condensation efficiency is remarkably improved. Meanwhile, a semi-closed heat circulation space is formed by the surrounding channel, heat generated by evaporation is mainly transmitted to the condensation plate in a water vapor mode, heat loss to the environment is reduced, and the overall heat energy utilization rate and the water production performance of the system are improved.

Description

Technical Field

[0001] This invention relates to the field of brine desalination technology, and more specifically, to a circular fabric distillation system and method thereof. Background Technology

[0002] Thermal desalination technology is currently one of the important methods for extracting freshwater from high-salinity industrial wastewater or seawater. Its core principle is based on a phase change process, where water is heated to evaporate and then condensed to obtain pure freshwater, while the salt remains in the raw water. Common thermal desalination technologies include multi-effect distillation (MED), multi-stage flash distillation (MSF), and mechanical vapor compression (MVC). These traditional distillation technologies are widely used due to their excellent desalination performance, especially suitable for treating high-salinity feedstocks (such as reverse osmosis concentrate), while also providing a stable output of high-quality freshwater resources.

[0003] However, traditional thermal desalination processes generally suffer from high energy consumption, strong dependence on fossil fuels, complex system structure, large equipment size, and high investment and operating costs. For example, they typically rely on coal or other chemical fuels as heat sources and require a large number of high-temperature and high-pressure equipment, thus limiting their promotion and application in distributed water supply or resource-constrained areas.

[0004] In recent years, fabric distillation technology has attracted widespread attention as a novel thermal desalination method. This technology uses low-cost hydrophilic fabric fibers as the mass transfer medium. Under the combined action of capillary force and gravity, the hot feed liquid can spread evenly on the fiber surface and evaporate. The water vapor is then condensed through a condenser wall, thus achieving desalination. Compared with traditional distillation methods, fabric distillation technology has many advantages, such as efficient utilization of low-grade heat sources (e.g., solar energy, geothermal energy, industrial waste heat), simple system structure, small footprint, convenient operation and maintenance, low investment and operating costs, and no secondary pollution. Therefore, it shows promising application prospects in seawater / brackish water desalination, high-salt and high-organic wastewater treatment and resource recycling.

[0005] However, most common fabric distillation systems currently employ a flat-plate structure, which suffers from significant heat loss, resulting in low thermal efficiency and insufficient evaporation driving force, thus limiting the system's water production efficiency and overall performance. This structural energy bottleneck severely restricts the practical promotion and engineering application of fabric distillation technology.

[0006] Therefore, there is an urgent need to develop a fabric distillation method with higher thermal energy utilization and higher water production efficiency to promote its large-scale application in the field of practical water treatment. Summary of the Invention

[0007] To address the problems of low thermal efficiency and insufficient evaporation driving force in the existing fabric distillation technology, this invention provides a circumferential fabric distillation system and method, which can improve thermal efficiency and water production performance.

[0008] To solve the above-mentioned technical problems, the technical solution provided by the present invention is as follows: A circular fabric distillation system is provided, comprising an evaporator, a fiber web, and a condenser plate. Both the fiber web and the condenser plate are disposed within the evaporator, and the fiber web and the condenser plate are coiled around the same axis and arranged parallel to each other with a constant normal spacing, forming a synchronous circular structure. A gap is provided between the bottom of the fiber web and the bottom of the inner cavity of the evaporator. It is understood that the normal spacing refers to the distance between the two circular structures in the direction perpendicular to the circular axis (i.e., radially).

[0009] In the above technical solution, hot brine first wets the fiber mesh. The water on the fiber mesh evaporates and floats onto the condenser plate, where it condenses to produce fresh water, thus achieving brine desalination. Because the fiber mesh and condenser plate form a synchronous, encircling structure, this structure is more compact and provides more gas-liquid interface space for evaporation and condensation compared to a flat structure, thereby improving water production efficiency. Furthermore, the encircling channel between the fiber mesh and condenser plate forms a semi-closed thermal circulation space, where heat is mainly transferred to the condenser plate via steam, reducing direct heat diffusion to the surrounding environment and minimizing heat loss from the fiber mesh, which is beneficial for increasing water production. In other words, this technical solution effectively reduces heat loss and improves thermal energy utilization efficiency, thereby significantly improving water production efficiency and freshwater yield.

[0010] Preferably, a diffusion plate is connected to the top of the fiber web, the diffusion plate having a hot water chamber, and at least a portion of the fiber web is exposed to the hot water chamber. Hot brine is first injected into the diffusion plate, and then evenly seeps into the fiber web through the diffusion plate, naturally diffusing to all parts of the fiber web by capillary action and gravity, without requiring additional energy input.

[0011] Preferably, the system further includes a hot water pipe, on which a first liquid pump and a heating module are mounted. The outlet end of the hot water pipe is connected to the evaporator and communicates with the hot water chamber. The first liquid pump pumps brine into the hot water pipe, and the heating module heats the brine in the hot water pipe to obtain hot brine. The hot brine then enters the diffuser plate through the outlet end of the hot water pipe.

[0012] Preferably, the system further includes a feed storage tank, a condensate tank, and a cold water pipe. The condenser plate has a flow chamber. A second liquid pump is installed on the cold water pipe. The inlet end of the cold water pipe is connected to the condensate tank, and the outlet end is connected to the condenser plate and communicates with the flow chamber. The inlet end of the hot water pipe is connected to the feed storage tank. The condensate tank stores condensate. The second liquid pump pumps the condensate from the condensate tank into the flow chamber of the condenser plate, maintaining a lower temperature on the surface of the condenser plate, thereby improving steam condensation efficiency. The condensate in the flow chamber flows back to the condensate pump after filling the flow chamber. The feed storage tank stores brine. A first liquid pump pumps the brine from the feed storage tank to the heating module. After heating, the brine enters the diffuser plate and then enters the fiber web through the combined action of capillary action and gravity.

[0013] Preferably, the outlet end of the cold water pipe is connected to the bottom of the condenser plate, and the outlet end of the hot water pipe is connected to the top of the evaporator. The cooler condensate is transported from bottom to top, ensuring that the condensate completely fills the flow chamber before flowing back to the condensate tank, thus ensuring the uniformity of the condenser plate surface temperature. Most importantly, the hot brine and condensate flow in opposite directions. As the hot water flows downwards at the top of the fiber mesh, it gradually releases heat and evaporates; as the condensate flows upwards at the bottom of the condenser plate, it gradually absorbs the latent heat of steam condensation and heats up. The constant large temperature difference between the two fluids promotes continuous heat transfer, which helps reduce external heating energy consumption.

[0014] Preferably, the system further includes a freshwater pipeline and a freshwater storage tank; the bottom of the evaporator is provided with a water receiving channel, which, together with the bottom of the evaporator, forms a water receiving trough, and the bottom of the condenser plate is connected to the water receiving trough; a third liquid pump is provided on the freshwater pipeline, the inlet end of the freshwater pipeline is connected to the water receiving trough, and the outlet end of the freshwater pipeline is connected to the freshwater storage tank. The freshwater obtained by the condensation of steam on the surface of the condenser plate flows into the water receiving trough, and then the third liquid pump pumps the freshwater in the water receiving trough into the freshwater storage tank, thereby achieving the collection of freshwater.

[0015] Preferably, the system further includes a reflux pipe, the inlet end of which is connected to the bottom of the evaporator and communicates with the inner cavity of the evaporator, the outlet end of which is lower than its inlet end, and the outlet end of the reflux pipe is connected to the feed storage tank; a cooling module is provided on the cold water pipe. Unevaporated brine on the fiber mesh will drip and accumulate at the bottom of the inner cavity of the evaporator, and the reflux pipe can transport the brine in the inner cavity of the evaporator to the feed storage tank.

[0016] The present invention also provides a circular fabric distillation method applied to the above-mentioned distillation system, which includes the following steps: Step S1: Turn on the second liquid pump and the cooling module. The second liquid pump pumps the condensate in the condensate tank to the flow chamber of the condenser plate, and at the same time the cooling module lowers the temperature of the condensate in the cold water pipe. Step S2: Turn on the first liquid pump and the heating module. The first liquid pump pumps the brine in the feed storage tank to the inner cavity of the diffuser, and at the same time the heating module heats the brine in the hot water pipe. Step S3: Turn on the third liquid pump to pump the fresh water in the water receiving tank to the fresh water storage tank.

[0017] Preferably, in step S1, the cooling module maintains the temperature of the condensate in the cold water pipe at 0~40℃, and the heating module heats the brine in the hot water pipe to 41~90℃. The condensate temperature is always lower than the temperature of the hot brine to ensure effective evaporation. The cooling module can lower the condensate temperature to 0~40℃ before supplying it to the condensing plate, keeping the condensing plate surface at a low temperature, thus ensuring steam condensation efficiency. The heating module heats the brine to 41~90℃ to provide driving force for evaporation, while ensuring high evaporation efficiency of the brine on the fiber mesh. The brine temperature entering the fiber mesh is always higher than the condensate temperature inside the condensing plate, ensuring a certain temperature difference is maintained between the fiber mesh and the condensing plate.

[0018] Preferably, the process further includes step S4: after confirming that the salt concentration in the feed storage tank has reached the set value (3 mol / L), first turn off the first and second liquid pumps, and then turn off the third liquid pump. After the brine concentration in the feed storage tank reaches the set value (3 mol / L), the brine is output for further processing. After the salt concentration in the feed storage tank reaches the set concentration, the salt or other dissolved solids in the brine have been concentrated to near saturation, facilitating subsequent separation and recovery through crystallization or precipitation.

[0019] The beneficial effects of this invention are: 1. This invention constructs a semi-enclosed thermal circulation space by arranging a hydrophilic fiber mesh and a condenser plate coaxially in a surrounding manner. This significantly reduces the ineffective diffusion of heat to the environment during evaporation, allowing heat to be transferred to the condenser surface mainly in the form of water vapor, thereby effectively improving the thermal energy utilization efficiency of the system.

[0020] 2. The present invention adopts a synchronous surrounding structure design, which makes the evaporation interface and condensation interface more compactly arranged, providing a larger evaporation and condensation area per unit volume. Compared with the traditional flat plate structure, it significantly enhances the evaporation driving force and phase change efficiency, thereby improving the water production rate and the overall freshwater output of the system. Attached Figure Description

[0021] Figure 1This is a schematic diagram of a circular fabric distillation system; the arrows in the diagram indicate the direction of liquid flow. Figure 2 This is a schematic diagram of the structure formed by the synchronous wrapping of the fiber mesh and the condenser plate; Figure 3 This is a schematic diagram showing the flow direction of the liquid inside the evaporator; the arrows in the diagram indicate the direction of liquid flow.

[0022] In the attached diagram: 1-Evaporator; 2-Fiber mesh; 3-Condensing plate; 301-Flow chamber; 4-Diffuser plate; 401-Hot water chamber; 5-Hot water pipe; 6-First liquid pump; 7-Heating module; 8-Feed storage tank; 9-Cold water pipe; 10-Second liquid pump; 11-Fresh water pipe; 12-Fresh water storage tank; 13-Water receiving channel; 1301-Water receiving tank; 14-Third liquid pump; 15-Return pipe; 16-Cooling module; 17-Condensate tank. Detailed Implementation

[0023] The accompanying drawings are for illustrative purposes only and should not be construed as limiting this patent. To better illustrate this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. The positional relationships described in the drawings are for illustrative purposes only and should not be construed as limiting this patent.

[0024] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "long," and "short" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0025] The technical solution of the present invention will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings: Example 1 This embodiment is a first embodiment of a circular fabric distillation system, such as... Figures 1 to 2As shown, it includes an evaporator 1, a fiber mesh 2, and a condenser plate 3, both of which are disposed inside the evaporator 1. The fiber mesh 2 and the condenser plate 3 are coiled around the same axis and arranged parallel to each other with a constant normal spacing, forming a synchronous surrounding structure; the bottom of the fiber mesh 2 is spaced from the bottom of the inner cavity of the evaporator 1. It can be understood that the normal spacing refers to the distance between the two surrounding structures in the direction perpendicular to the surrounding axis (i.e., radial).

[0026] The working principle or workflow of this embodiment is as follows: Hot brine first wets the fiber mesh 2. The water on the fiber mesh 2 evaporates and disperses onto the condenser plate 3, where it condenses to produce fresh water, thus achieving brine desalination. Because the fiber mesh 2 and the condenser plate 3 form a synchronous, encircling structure, this structure is more compact and provides more gas-liquid interfaces for evaporation and condensation compared to a flat structure, thereby improving water production efficiency. Furthermore, the encircling channel between the fiber mesh 2 and the condenser plate 3 forms a semi-enclosed thermal circulation space, where heat is mainly transferred to the condenser plate 3 through steam, reducing direct heat diffusion to the surrounding environment and minimizing heat loss from the fiber mesh 2, which is beneficial for increasing water production. In other words, the above technology can effectively reduce heat loss and improve thermal energy utilization efficiency, thereby significantly improving water production efficiency and freshwater yield.

[0027] Example 2 This embodiment is a second embodiment of a circumferential fabric distillation system, which is a further optimization based on Embodiment 1. For example... Figures 1 to 3 As shown, the top of the fiber mesh 2 is connected to a diffuser plate 4 that surrounds the fiber mesh 2 synchronously. The diffuser plate 4 is provided with a hot water chamber 401 and a water outlet. The fiber mesh 2 is connected to the water outlet, so that the top surface of the fiber mesh 2 is exposed to the hot water chamber 401.

[0028] Furthermore, it also includes a hot water pipe 5, which is equipped with a first liquid pump 6 and a heating module 7. The outlet end of the hot water pipe 5 is connected to the hot water chamber 401. The first liquid pump 6 pumps brine into the hot water pipe 5, and the heating module 7 heats the brine in the hot water pipe 5 to obtain hot brine. The hot brine then enters the diffuser plate 4 through the outlet end of the hot water pipe 5.

[0029] Furthermore, it also includes a feed storage tank 8, a condensate tank 17, and a cold water pipe 9. A flow chamber 301 is provided within the condenser plate 3. A second liquid pump 10 is installed on the cold water pipe 9. The inlet end of the cold water pipe 9 is connected to the condensate tank 17, and the outlet end is connected to the bottom of the condenser plate 3 and connected to the flow chamber 301. The inlet end of the hot water pipe 5 is connected to the feed storage tank 8, and the outlet end of the hot water pipe 5 is located at the top of the evaporator 1. The condensate tank 17 is used to store condensate. The second liquid pump 10 pumps the condensate in the condensate tank 17 into the flow chamber 301 of the condenser plate 3. The condensate in the flow chamber 301 flows back to the condensate tank 17 after filling the flow chamber 301. The feed storage tank 8 is used to store brine. A first liquid pump 6 pumps the brine in the feed storage tank 8 to the heating module 7. After heating, it enters the diffuser plate 4 and then enters the fiber web 2 through the combined action of capillary action and gravity.

[0030] Furthermore, it also includes a freshwater pipeline 11 and a freshwater storage tank 12; the bottom of the evaporator 1 is provided with a water receiving channel 13, which together with the bottom of the evaporator 1 forms a water receiving trough 1301, and the bottom of the condenser plate 3 is connected to the water receiving trough 1301; a third liquid pump 14 is provided on the freshwater pipeline 11, the inlet end of the freshwater pipeline 11 is connected to the water receiving trough 1301, and the outlet end of the freshwater pipeline 11 is connected to the freshwater storage tank 12. The freshwater obtained by the condensation of steam on the surface of the condenser plate 3 flows into the water receiving trough 1301, and then the third liquid pump 14 pumps the freshwater in the water receiving trough 1301 to the freshwater storage tank 12, thereby realizing the collection of freshwater.

[0031] Furthermore, it also includes a reflux pipe 15, the inlet end of which is connected to the middle of the bottom of the evaporator 1 and communicates with the inner cavity of the evaporator 1, the outlet end of the reflux pipe 15 is lower than its inlet end, and the outlet end of the reflux pipe 15 is connected to the feed storage tank 8; a cooling module 16 is provided on the cold water pipe 9. Unevaporated brine on the fiber mesh 2 will drip to the bottom of the inner cavity of the evaporator 1 and accumulate, and the reflux pipe 15 can transport the brine in the inner cavity of the evaporator 1 to the feed storage tank 8.

[0032] Example 3 This embodiment is a circular fabric distillation method used in the system of Embodiment 2, combined with... Figures 1 to 3 It includes the following steps: Step S1: Turn on the second liquid pump 10 and the cooling module 16. The second liquid pump 10 pumps the condensate in the condensate tank 17 into the flow chamber 301 of the condenser plate 3. At the same time, the cooling module 16 lowers the temperature of the condensate in the cold water pipe 9. Step S2: Turn on the first liquid pump 6 and the heating module 7. The first liquid pump 6 pumps the brine in the feed storage tank 8 to the inner cavity of the diffuser plate 4, while the heating module 7 heats the brine in the hot water pipe 5. Step S3: Turn on the third liquid pump 14 to pump the fresh water in the water receiving tank 1301 into the fresh water storage tank 12.

[0033] Furthermore, step S4 is included: after confirming that the salt concentration in the feed storage tank 8 has reached the set value (3 mol / L), the first liquid pump 6 and the second liquid pump 10 are turned off first, and then the third liquid pump 14 is turned off. The brine dripping from the fiber mesh 2 is desalinated brine with a high salt concentration. After multiple rounds of desalination, the salt concentration in the feed storage tank 8 gradually increases. If the salt concentration is too high, continuing desalination would be a waste of resources. Therefore, desalination is stopped once the brine concentration in the feed storage tank 8 reaches the set value. After the salt concentration in the feed storage tank 8 reaches the set value, the salt or other dissolved solids in the brine have been concentrated to near saturation, facilitating subsequent separation and recovery through crystallization or precipitation.

[0034] Example 4 A factory's membrane distillation unit was plagued by membrane wetting and fouling issues, necessitating an upgrade. The upgrade involved replacing the original membrane contactor with a wraparound fabric distillation unit, which occupies approximately 3 square meters of floor space. 2 The fabric is 20m long, 1m high, and has a total area of ​​20m². 2 The feed salinity is 30,000 mg / L, the surfactant content (sodium dodecyl sulfate) is 25 mg / L, the pH value is 7, and the temperature is 20℃. During the factory production process, the waste flue gas can be used as a heat source for the heating module, with the temperature set at 70℃, and the condensation module temperature is set at 30℃.

[0035] This embodiment is a second embodiment of a circular fabric distillation method, and its specific implementation steps are as follows: Step 1: Turn on the second liquid pump 10 and the cooling module 16. The second liquid pump 10 pumps the condensate in the condensate tank 17 into the flow chamber 301 of the condenser plate 3, while the cooling module 16 lowers the temperature of the condensate in the cold water pipe 9. Step 2: Turn on the first liquid pump 6 and the flue gas heating module 7. The first liquid pump 6 pumps the brine in the feed storage tank 8 to the inner cavity of the diffuser plate 4, while the flue gas heating module 7 heats the brine in the hot water pipe 5. Step 3: Turn on the third liquid pump 14 to pump the fresh water in the water receiving tank 1301 into the fresh water storage tank 12; Step 4: After confirming that the salt concentration in the feed storage tank 8 reaches 200,000 mg / L, first turn off the first liquid pump 6 and the second liquid pump 10, and then turn off the third liquid pump 14.

[0036] Fabric distillation was continuously operated at a stable high flux for 24 hours, producing 40 kg of water per hour with a heat utilization rate of 72.9%. The desalination rate was as high as 99.99%, the total organic carbon (TOC) content was 0.28 mg / L, and the final product water salinity was measured at 3.74 mg / L, meeting the standards for distilled water.

[0037] Example 5 An industrial wastewater source has a salinity of 35,000 mg / L, total organic carbon (oil) of 1,100 mg / L, pH of 7, and a temperature of 25°C. It is treated to achieve zero discharge using a circular fabric distillation method, with the distillation equipment occupying approximately 5 square meters of floor space. 2 The fabric is 24m long, 1m high, and has a total area of ​​24m². 2 The temperature of heating module 7 is set to 60℃, and the temperature of cooling module 16 is set to 20℃.

[0038] This embodiment is the third embodiment of a circumferential fabric distillation method, and its specific implementation steps are as follows: Step 1: The wastewater first passes through an oil removal tank to remove surface oil. The degreased feed liquid enters the feed storage tank 8, and the second liquid pump 10 and cooling module 16 are turned on. The second liquid pump 10 pumps the condensate in the condensate tank 17 to the flow chamber 301 of the condenser plate 3, while the cooling module 16 lowers the temperature of the condensate in the cold water pipe 9. Step 2: Turn on the first liquid pump 6 and the heating module 7. The first liquid pump 6 pumps the brine from the feed storage tank 8 into the inner cavity of the diffuser plate 4, while the heating module 7 heats the brine in the hot water pipe 5. Step 3: Turn on the third liquid pump 14 to pump the fresh water in the water receiving tank 1301 into the fresh water storage tank 12; Step 4: After confirming that the salt concentration in the feed storage tank 8 reaches 150,000 mg / L, first turn off the first liquid pump 6 and the second liquid pump 10, and then turn off the third liquid pump 14.

[0039] Fabric distillation was continuously operated at a stable high flux for 24 hours, producing 48 kg of water per hour with a heat utilization rate of 76.6%. The desalination rate was as high as 99.99%, and the final product water salinity was measured at 3.77 mg / L, meeting the standards for distilled water.

[0040] Example 6 The salinity of the factory wastewater is 35000 mg / L, of which Ca... 2+ SO4 2- The concentration was 30 mmol / L, the pH was 7, and the temperature was 25℃. Zero-emission treatment was achieved using a circular fabric distillation method, with the distillation equipment occupying approximately 5m² of floor space. 2The fabric is 28m long, 1m high, and has a total area of ​​28m². 2 The temperature of heating module 7 is set to 60℃, and the temperature of cooling module 16 is set to 20℃.

[0041] This embodiment is the fourth embodiment of a circular fabric distillation method, and its specific implementation steps are as follows: Step 1: Factory wastewater is passed through a security filter to remove suspended solids. After oil removal, the feed liquid enters the feed storage tank 8. The second liquid pump 10 and the cooling module 16 are turned on. The second liquid pump 10 pumps the condensate in the condensate tank 17 to the flow chamber 301 of the condenser plate 3. At the same time, the cooling module 16 lowers the temperature of the condensate in the cold water pipe 9. Step 2: Turn on the first liquid pump 6 and the heating module 7. The first liquid pump 6 pumps the brine from the feed storage tank 8 into the inner cavity of the diffuser plate 4, while the heating module 7 heats the brine in the hot water pipe 5. Step 3: Turn on the third liquid pump 14 to pump the fresh water in the water receiving tank 1301 into the fresh water storage tank 12; Step 4: After confirming that the salt concentration in the feed storage tank 8 reaches 150,000 mg / L, first turn off the first liquid pump 6 and the second liquid pump 10, and then turn off the third liquid pump 14.

[0042] Fabric distillation was continuously operated at a stable high flux for 24 hours, producing 56 kg of water per hour with a heat utilization rate of 75.8%. The desalination rate was as high as 99.99%, and the final product water salinity was measured at 3.58 mg / L, meeting the standards for distilled water.

[0043] Comparative Example 1 This comparative example is similar to Example 3, except that it uses a flat-plate fabric distillation apparatus, which occupies an area of ​​approximately 3m². 2 It is the same height as the surrounding fabric distillation device, with a total fabric length of 10.5m, a height of 1m, and a total area of ​​10.5m². 2 The same production wastewater as in Example 5 was treated, with a salinity of 30,000 mg / L, a surfactant content (sodium dodecyl sulfate) of 25 mg / L, a pH of 7, and a temperature of 20°C. Waste flue gas generated during the factory production process was used as the heat source for the heating module.

[0044] When fabric distillation was continuously operated at a stable flux for 24 hours at a high flux, the hourly water production was only 21 kg, a decrease of 47.5% compared to the previous operation. Furthermore, the heat utilization rate was 43.8%, a decrease of 39.9%.

[0045] Comparative Example 2 This comparative example is similar to Comparative Example 1, except that it uses a flat-plate fabric distillation apparatus, which occupies an area of ​​approximately 5m². 2 It is the same height as the circular fabric distillation device, with a total fabric length of 16m, a height of 1m, and a total area of ​​16m². 2 The industrial wastewater produced has a salinity of 35,000 mg / L, total organic carbon (engine oil) of 1,100 mg / L, pH of 7, and a temperature of 25°C.

[0046] When fabric distillation was continuously operated at a stable flux for 24 hours at a high flux, the hourly water production was only 32 kg, a decrease of 33.3% compared to the previous operation. Furthermore, the heat utilization rate was 50.6%, a decrease of 33.9%.

[0047] Comparative Example 3 This comparative example is similar to Comparative Example 2, except that it uses a flat-plate fabric distillation apparatus, which occupies an area of ​​approximately 5m². 2 The fabric is at the same height as the circular fabric distillation apparatus, with a total length of 22m, a height of 1m, and a total area of ​​22m². 2 The industrial wastewater produced has a salinity of 35,000 mg / L, total organic carbon (engine oil) of 1,100 mg / L, pH of 7, and a temperature of 25°C.

[0048] When fabric distillation was continuously operated at a stable flux for 24 hours at a high flux, the hourly water production was only 44 kg, a decrease of 21.4% compared to the previous operation. Furthermore, the heat utilization rate was 48.7%, a decrease of 35.8%.

[0049] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0050] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will recognize that other variations or modifications can be made based on the above description, and it is neither necessary nor possible to exhaustively describe all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A surrounding fabric distillation system, comprising an evaporator (1), a fiber web (2), and a condenser plate (3), wherein the fiber web (2) and the condenser plate (3) are both disposed within the evaporator (1), characterized in that, The fiber mesh (2) and the condenser plate (3) are coiled on the same axis and are arranged in parallel with a constant normal distance; the bottom of the fiber mesh (2) and the bottom of the inner cavity of the evaporator (1) are spaced apart.

2. The circumferential fabric distillation system according to claim 1, characterized in that, The fiber mesh (2) is connected to a diffuser plate (4) at the top. The diffuser plate (4) is provided with a hot water chamber (401). The fiber mesh (2) is connected to the hot water chamber (401).

3. The circumferential fabric distillation system according to claim 2, characterized in that, It also includes a hot water pipe (5), on which a first liquid pump (6) and a heating module (7) are provided. The outlet end of the hot water pipe (5) is connected to the evaporator (1) and communicates with the hot water chamber (401).

4. The circumferential fabric distillation system according to claim 3, characterized in that, It also includes a feed storage tank (8), a condensate tank (17) and a cold water pipe (9). The condenser plate (3) is provided with a flow chamber (301). A second liquid pump (10) is provided on the cold water pipe (9). The inlet end of the cold water pipe (9) is connected to the condensate tank (17), and the outlet end is connected to the condenser plate (3) and connected to the flow chamber (301). The inlet end of the hot water pipe (5) is connected to the feed storage tank (8).

5. A circumferential fabric distillation system according to claim 4, characterized in that, The outlet end of the cold water pipe (9) is connected to the bottom of the condenser plate (3), and the outlet end of the hot water pipe (5) is connected to the top of the evaporator (1).

6. The circumferential fabric distillation system according to claim 5, characterized in that, It also includes a freshwater pipe (11) and a freshwater storage tank (12); the bottom of the evaporator (1) is provided with a water receiving channel (13), the water receiving channel (13) and the bottom of the evaporator (1) form a water receiving trough (1301), and the bottom of the condenser plate (3) is connected to the water receiving trough (1301); a third liquid pump (14) is provided on the freshwater pipe (11), the inlet end of the freshwater pipe (11) is connected to the water receiving trough (1301), and the outlet end of the freshwater pipe (11) is connected to the freshwater storage tank (12).

7. A circumferential fabric distillation system according to claim 6, characterized in that, It also includes a return pipe (15), the inlet end of which is connected to the bottom of the evaporator (1) and communicates with the inner cavity of the evaporator (1), the outlet end of the return pipe (15) is lower than its inlet end, and the outlet end of the return pipe (15) is communicated with the feed storage tank (8); a cooling module (16) is provided on the cold water pipe (9).

8. A circular fabric distillation method, applied to the distillation system of claim 7, characterized in that, Includes the following steps: Step S1: Turn on the second liquid pump (10) and the cooling module (16). The second liquid pump (10) pumps the condensate in the condensate tank (17) into the flow chamber (301) of the condenser plate (3), while the cooling module (16) lowers the temperature of the condensate in the cold water pipe (9). Step S2: Turn on the first liquid pump (6) and the heating module (7). The first liquid pump (6) pumps the brine in the feed storage tank (8) to the inner cavity of the diffuser plate (4), while the heating module (7) heats the brine in the hot water pipe (5). Step S3: Turn on the third liquid pump (14) to pump the fresh water in the water receiving tank (1301) into the fresh water storage tank (12).

9. A circular fabric distillation method according to claim 8, characterized in that, In step S1, the cooling module (16) lowers the temperature of the brine in the cold water pipe (9) to 0~40℃, and the heating module (7) heats the brine in the hot water pipe (5) to 41~90℃.

10. A circular fabric distillation method according to claim 9, characterized in that, It also includes step S4: after confirming that the salt concentration in the feed storage tank (8) has reached the set value, first turn off the first liquid pump (6) and the second liquid pump (10), and then turn off the third liquid pump (14).

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