TW559567B - Method and system for desalination sea water by membrane distillation - Google Patents

Abstract

The present invention provides a method and a system for desalination sea water by a membrane distillation where sea water receives a pre-treatment including filtration, forming fine bubbles, pressurization and skimming to remove suspended solid impurities of alge, etc. Then the skimmed feed water receives another treatment of forming fine bubbles so that the sea water and bubbles form a uniform emulsion working fluid in which the bubbles are full of saturated steam. The working fluid is then transported to a desalination device, which contains one or more porous hydrophobic membrane, such that the work fluid permeates easily through the porous hydrophobic membrane to form clean water from condensation of the penetrated steam molecules.

Description

559567 C7 D7 11 V. INTRODUCTION TO THE INVENTION [Field of the Invention] The present invention relates to a membrane distillation method and applied equipment. More specifically, it particularly refers to a method that can improve seawater desalination water production efficiency, and can improve the membrane. Membrane distillation seawater desalination method and system for greatly reducing the cost of distilling seawater desalination. [Description of Known Skills] At present, the desalination and water-making technologies used in commercial desalination in the world can be mainly divided into distillation methods (Distillation). And Membrane Desalination. Distillation methods include: Multi-Stage Flash or MSF, Multi-Effect Distillation or MED, and Vapor Compression. Or VC), etc. There are two main methods of membrane separation: reverse osmosis (Reverse Osmosis or Ro) and electrodialysis (ED). The desalination technology used in seawater desalination uses multiple stages of flash boiling in the early stage. The most common method is 'mainly used in large-scale desalination plants in the Middle East, and often operates in conjunction with thermal power plants' using thermal power plants The low-pressure waste steam used by the turbine, as a heat source for heating seawater during the desalination process, accounts for 48.1% of the world's total desalination (9.87 million CMD, 1996). MSF has been commercialized since 195G. φ is large in production capacity and should be general, so the operation and maintenance technology is proficient, and its unit module contention: the hole making water can be 60057,600 CMD. The multi-stage flash boiling raw water is 椟 e, the right is a one-pass type (Onc thermal energy loss And brine through) will cause problems such as increasing the cost of dosing, changing the use of brine and the impact of chemicals on the environment, etc. At present, many paper standards are applicable to the Chinese National Standard (CNS) A4 specification (210x 297 mm) 559567 C7 ____ D7 V. Description of the invention (2) Ring mode operation. Although the reverse osmosis method (RO, whose process is shown in Figure 1) was developed relatively late, it is being widely used in countries all over the world, mainly due to thin film materials and energy. The recovery and improvement technology has reached the mature stage, which not only reduces the desalination cost and increases the water production rate. 'The salt removal rate is as high as 99.5 〇 / 〇, and the average service life of the membrane tube has been extended to about 5 years.' It can be applied to the treatment of industrial wastewater. In terms of recycling and reuse of the cooling water tower's discharged water, its water production accounts for about 3 5.9% of the world's total desalination (7.29 million CMD, 1996). Although the reverse osmosis method was developed in the late 1970s, due to the short construction time, The small area and easy assembly of the module make RO the most competitive and fast-growing desalination technology. However, the development of RO technology still has pretreatment, improved operating conditions (temperature, pH, power consumption), and Issues such as membrane technology for extending the useful life of thin films remain to be studied. In addition to the above methods, there are seawater desalination technologies using membrane distillation, solar power generation, deep sea water pressure differential, and liquefied natural gas (LNG) cold energy utilization. Membrane Distillation (MD: Membrane Distillation) combines the advantages of "conventional distillation" and "thin film separation". The conductivity value of the produced water is less than 10 pS / cm. The porous hydrophobic membrane A (Hydrophobic Porous Membrane) through which the vapor molecules pass, separates the two types of working water bodies. Such hydrophobic small holes can be prevented by the surface tension to prevent the liquid water body from passing through. If the temperature of the two working water bodies is controlled to be different, the result will be different vapor pressures on both sides, which will cause water vapor molecules to pass through the water body at high temperature (high vapor pressure). _ This paper size applies Chinese National Standard (CNS) A4 specifications (210x 297 mm) " Page 4 559567

Cl _______D7__ V. Description of the invention (3) If it is applied in a purified membrane, it can be seen that Qiu Zhengxun can penetrate from the membrane channel to another low temperature (low vapor pressure) water body < cooling at low temperature can reach the water body at high temperature The water i is separated to a low temperature, so it can be used to desalinate seawater, which is also a technique known to Yao. In Taiwan, the technical shooting of such a pre-MD case was disclosed in Patent Cases No. 34 1 523, 506944 (filed by Professor Ma Zheru 'and others). The relationship between the vapor pressure difference due to the temperature difference

Clausius _ Clapeyron relation to describe:

InP = + C and the flux of mass transfer is as follows: Mountain = B · Δ Pi Contact angle From the viewpoint of interface chemistry, the name of the water body on the surface of this film must be greater than 90. That is, it is effective for hydrophobic films. 2 r. △ P =-" T " 1 c0s0 (LaPlace equation) 0 > 90 ° cos θ < 0 ΔP > 〇 However, the membrane distillation method has the following advantages: 1 The use of land is small. 2 · Low equipment cost. 3 · Low operating temperature and pressure, low energy consumption. 4 · The mechanical strength required for the film is low. This paper size applies to China National Standard (CNS) A4 specifications (210 x 297) $ --- page 5 559567

Cl _____D7 V. Description of the invention (4) 5 · High purity of produced water. However, the conventional membrane distillation method has the following disadvantages: 1) Good 刖 treatment equipment is required to avoid fouling of the membrane surface. 2 • Temperature polarization may occur on the surface of the 'film during mass transfer (Temperature Polarization). That is, when the solution evaporates, a temperature gradient is generated on the surface of the liquid in contact with the film, which causes the effective temperature difference between the two sides of the film to be less than the temperature difference of the set solution, which makes the effective driving of the film low and the amount of penetration reduced. 3. During the mass transfer process, a concentration phenomenon may also occur on the surface of the film. During the film process, the high-temperature feed solution evaporates into vapor, and condenses through the film. At this time, the water at the interface between the feed water and the film increases the concentration due to the loss of water, which makes it difficult for the vapor to evaporate and the permeation amount to decrease. 4 · According to the saturated vapor pressure data of water vapor, under normal operation, the temperature is increased from 25 ° C to 30 ° C, the saturated vapor pressure is increased from 0.461 to 0 · 6 1 6 ps ί, and the temperature is increased to 30 ° C When the temperature is increased by 5 ° C, the water production limit, that is, the average temperature rises per degree Celsius, the saturated vapor pressure increases by 0 psi, which is too small. 5. Because the limited temperature difference is used for osmotic mass transfer of liquid-gas balance, the mass transfer speed is relatively slow. Therefore, a large temperature difference between the two membrane bodies must be maintained to compensate for this problem. However, it is impossible to limit the operating temperature of the film. Too high and inefficient energy consumption have led to competition with general commercial technologies. This paper size applies the Chinese National Standard (CNS) A4 specification (210x297 mm). Page 6 Clogging will forcefully reduce the polarization. Distilled water, the state of formation of water. Psi Quantity • 031 Volumetric Flow Measurement Material Not Available 559567 C7

6. The liquid has been vaporized, and the actual water production is not large. 7 · Right to mass production economic benefits. The process (phase change) only occurs in a small amount of pores. 'A lot of energy and membrane tubes must be provided, which is inconsistent, but because the invention of the output is aimed at the world. The above-mentioned shortcomings have not been successfully commercialized, and improvement methods have been proposed. [Summary of the Invention] 'It is to provide a seawater desalination method which can enhance seawater desalination membrane distillation. It is to provide a membrane distillation seawater desalination. Therefore, one object of the present invention is to improve the efficiency and reduce the cost of water production. Another object of the present invention is the system. The membrane distillation seawater desalination method of the present invention and its system and system include the following steps: 1. Supplying seawater: take a container containing a predetermined volume of seawater and subject the seawater to pre-filtration to remove some impurities; Second, the pressurized fouling removal s • The filtered seawater is micro-bubbled before being pressurized to float [to remove suspended solid impurities such as algae; III. Micro-bubble gas injection treatment. Pass the floated feed water through The micro-bubble gas-water mixture is processed again to make the seawater and gas mixed into a uniform white mist emulsified working liquid, and the bubbles are saturated with water vapor; 4. Desalination treatment: The working liquid in a uniform gas-water mixed state is sent to a Desalination device, the desalination device has one or more hydrophobic porous film inside, so that the high-gas content working liquid containing a large amount of saturated water vapor can easily pass through the porous hydrophobic film; 5. Condensing component: the water vapor passing through the film The molecules are coagulated to produce fresh water. Use Chinese National Standard (CNS) A4 specification (210χ 297 public love)-"Page 559567 C7 ^ _ _D7 V. Description of the invention (6) [Simplified description of the diagram] Other features and advantages of the present invention are as follows In the detailed description of the preferred embodiment with reference to the figure, it can be clearly understood that in the figure: The first figure is a block flow chart illustrating the processing flow of the existing RO thin film desalination method; the second figure is A block flow diagram illustrating the processing flow of the conventional membrane distillation method (MD); the third figure is an enlarged schematic diagram of a partial structure illustrating a situation in which a conventional seawater desalination device uses heated seawater to generate fresh water; the fourth figure is a block The flow chart illustrates the processing flow of a preferred embodiment of the membrane distillation seawater desalination method of the present invention. The fifth diagram is a system configuration diagram illustrating the components of the membrane distillation seawater desalination system of the present invention and the wiring of the pipeline; the sixth The figure is a corresponding schematic diagram illustrating the situation that the present invention can greatly increase the amount of water vapor after blowing and heating; and the seventh diagram is a comparison schematic diagram illustrating that the invention passes through nanometers. Fine bubbles to saturation state of the working fluid, can be massive release of water vapor penetration into the porous film-forming organic fresh state, and the difference in the amount of fresh water into the case with conventional raw film distillation process. [Detailed description of the preferred embodiment] Referring to the fourth and fifth figures, a membrane distillation seawater desalination method and system thereof according to the present invention include the following steps: 1. Supplying seawater • Take a container 20 containing a predetermined volume of seawater paper Standards apply to Chinese National Standard (CNS) A4 specifications (210 x 297 mm) Page 8 559567

Cl D7 V. Description of the invention (7) 2. Pressurized floatation and gas-water mixing: a pumping motor 30 is installed on a pipeline to perform seawater extraction on the container 20, and a gas supplier is provided on the other side of the pipeline. 40. The gas supplier 40 can send _ predetermined gas 4 to the pipeline. In this embodiment, the gas 4 is general air. Before mixing, the gas 4 is pre-heated under pressure and then mixed with seawater 1 Mixed into a working liquid 5 with gas, the purpose of heating is to make the mixed working liquid 5 with a certain high temperature, which can accelerate the production of water vapor in the working liquid 5, and the energy required to heat the gas is much less than The heating of the liquid has the effect of saving costs. In addition, after the gas 4 and the seawater 1 are mixed into the working liquid 5, the high-pressure working liquid 5 is sent to a decompression cylinder 50 for decompression storage. The decompression cylinder 50 — A pressure relief valve 51 is provided on the side, and the pressure relief valve 51 is connected to the gas supplier 40 so that the working fluid 5 can be circulated in the pipeline. 3. Micro-bubble treatment: The working liquid 5 is transferred from the decompression cylinder 50 to a nanometer-level micro-bubble device 60, and its main function is to disintegrate and emulsify the working liquid 5 to make water molecules in the working liquid 5 It can be miniaturized due to a large amount of aeration, and the relative amount of steam generated is increased. As shown in the sixth figure, this principle is like the amount of steam generated after the water in the pot is blown and heated. Far more than simply heating the water in the pot normally: As for the means of miniaturizing water molecules, a variety of different technologies can be used. In this embodiment, 'the nano-level micro-bubble device 6 〇 uses * a bubble Generator (not shown), the working principle of this kind of foam generator is known (such as Taiwan No. 215 5 8 5) No., the first paper size of the United States _Home Standard (CNS) A4 specification (employment ^^ foot) Page 9 559567 C7 D7 V. Description of the invention (8) 6,293,529! Tigers and other patents), so it will not be added here Praise. 4. Desalination process: The working liquid 5 is then transferred to a desalination device 70. At the same time, referring to the seventh figure, the desalination device 7 () is provided with a plurality of hydrophobic porous organic membranes 71, and is connected on one side. A drainage pipe 73 and / or fire water & road 74 are provided. The porous organic membranes 7 i can be arranged in series or in parallel. Since the working liquid 5 of the present invention has undergone ultra-fine processing, the concentration has reached a saturated level. In this state, a large amount of water-based gas 2 can be generated to penetrate the porous organic film 71. … 5. Condensing component: The condensing component 72 that reaches the other side through the porous organic M 71❿ is condensed. In this embodiment, the desalination device 70 is ventilated to cool the condensing component 72. In the future, the water radon gas 2 can be condensed to generate fresh water 3, and the processed working liquid 5 can be transported to the drainage pipe 73, which can be connected with another desalination device (not shown in the figure). The working liquid 5 can be repeatedly used, and the fresh water 3 can be transported to the fresh water pipeline 74. In addition, a negative pressure element 80 is connected to the fresh water pipeline 74. The negative pressure element 80 is usually a vacuum pump. The fresh water 3 is drawn to another container 90 for storage. In the above system, in addition to adding nano-scale micro-bubble pressurized pre-treatment equipment to enhance the pre-treatment effect of the original membrane distillation method, the key point of the present invention is that the membrane surface of the present invention was originally liquid that could not be directly diffused. The space occupied by the phase is directly replaced by saturated water vapor. In this way, 'the original vapor diffusion mode similar to the Arnold diffusion device' was changed to forced convection in gas phase (f0rced convective mass (CNS) A4 specification (21Gx 297)) 10 pages 559567

Cl ___D7_ 5. Description of the invention (9) Transfer) mode, its mass transfer mode is changed from diffUSion to partial convective, and the amount of diffusion is greatly increased. In the following, experiments under various conditions will be used to further verify the purpose that the invention can achieve: [Application example description] The original thin film distillation operation example: Example 1: Liqui-Cel® 10-inch X- An example of 40 degassing membranes connected in series (25 C); this membrane is made of hydrophobic polypropylene hollow fiber material, representing a pore size of 0.03 μm, and operates in vacuum mode. Operated by the traditional membrane evaporation method, the flow rate is 100 gpm, the water content in the produced water is 35.6%, and the produced water is 166 grams per hour, and the flow rate is equivalent to 0.00064 L / hr m2 or 0.00038 GFD. If such a film is used for desalination, the amount of water produced is too small.

Table 1 Calculation example of membrane distillation method / 25 ° C

Flows Inlet Outlet Perm Volume flow, gpm 100.00 100.00 0.360 Mass flow, lb / hr 50,050.13 50,048.68 1.453 Mol flow, lb-mole / hr ) 2,778.07 2,778.0 1 0.057 Mole Percent — Oxygen 0.0004798% 0.0000306% 21.89% Nitrogen 0.0009 1 05% 0.000058 1% 41.54% Water 99.998589% 99.9999 10% 3 5.63〇 / 〇 Carbon Dioxide (carbon dioxide) 0.0000206% 0.00000 1 3% 0.94% This paper size applies to China National Standard (CNS) A4 (210x 297 mm) Page 11 559567

Avg MW (average molecular weight) 18.016 1 8 η 1 25.475 Approximate Vapor Load (lb-mole / hr) 0.057 Approx. Vapor Molar Comp. Lb-mole / hr g / hr Oxygen ( Oxygen) 21.89% 0.012 181 Nitrogen (nitrogen) 41.54% 0.024 301 Water (water) 3 5.63% 0.020 166 Carbon Dioxide (carbon dioxide) 0.94% 0.001 11 Example 2: Using a degassing membrane (30 ° C) Same as above, using traditional membrane distillation The temperature is increased by 5 ° C, the flow rate is 100% of the water content in the produced water is 47.7%, the water produced per hour is 258 grams, and the flow rate is equivalent to 0.00099 L / hr m2 or 000058 GFD, which is still too low.

Table 2 Calculation example of membrane distillation method / 30 ° C

Flows Inlet Outlet Perm Volume flow, gpm 100.00 100.00 0.418 Mass flow, lb / hr 50,050.13 50,048.54 1.592 Mol flow, lb-mole / hr 2,778.07 2,778.00 0.066 Mole Percent Oxygen 〇.〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇 4449〇 / 0 0.0000234% 17.70% Nitrogen 0.0008502% 0.0000447% 3 3.8 3% Water 99.998686% 99.99993 1% 47.74% Carbon Dioxide 0.00001 82% 0.0000010% 0.72% This paper size applies to China National Standard (CNS) A4 specifications (210x 297 mm) PCT) Page 12 559567 C7 D7 V. Description of the invention (11)

Avg MW 18.016 18.016 24.063 Approximate Vapor Load (lb-mole / hr) 0.066 Approx. Vapor Molar Comp. Lb-mole / hr g / hr Oxygen 17.70% 0.012 170 Nitrogen 3 3.83% 0.022 284 Water 47.74% 0.032 258 Carbon Dioxide 0.72% 0.000 10 Example 3: Using a degassing membrane (43 ° c) Same as above, operated by the traditional membrane distillation method, the temperature is increased by 43 ° C, the flow rate is 100 gpm, the water content in the produced water is 97.2 〇 / 〇, and the water produced per hour is 8,986 G, with a flow rate equivalent to 34.6 L / hr m2 or 20.3 GFD.

Table 3 Example of membrane distillation method calculation / 43cC

Flows Inlet Outlet Perm Volume flow, gpm 100.00 99.96 7.145 Mass flow, lb / hr 50,050.13 50,029.39 20.740 Mol flow, lb-mole / hr 2,778.07 2,776.94 1.131 Mole Percent Oxygen 0.0003803% 0.0000001% 0.93% Nitrogen 0.0007390% 0.000790%. 〇2% 1.8 1% Water 99.998867% 99.999999% 97.22% Carbon Dioxide 0.0000 136% 0.0000000% 0.0 3% Avg MW 18.016 18.016 18.337 Approximate Vapor Load (lb-mole / hr) 1.131 Approx. Vapor Molar Comp. (Lb-mole / hr) g / hr This paper size is applicable to China National Standard (CNS) A4 (210x 297 mm) Page 13 559567 C7 D7 V. Description of the invention (12)

Oxygen 0.93% 0.011 153 Nitrogen 1.8 1% 0.021 261 Water 97.22% 1.100 8,986 Carbon Dioxide 0.03% 0.000 8 Example 4: Using a PTFE microfiltration membrane (20 ° C) mean pore size (average 隙 size): 0.2 μηι mean thickness (Average thickness): 60 μηι mass of water vapor in saturated air 20 ° C: 17.24 g / m3 > mean bubble point: 19 psi Patm (atmospheric pressure): 14.7 psi typical air flow rate: 6 L / min cm2

= 0.36m3 / hr cm2 = 6.21 g / hr cm2 = 62.1 L / hr m2 = 36.5 GFD is 3-6 times that of ordinary seawater desalination membranes. This is a special case of a fully saturated gas at 20 ° C. If the temperature is increased to 43 ° C, the typical air flow rate exceeds 12 L / min cm2 43〇C ·· 59.24 g / m3

Therefore, the circulation volume will exceed 12 * 0.06 * 59.24 = 42.7 g / hr em2 = 427 L / hr cm2 = 25 1 GFD This paper size applies the Chinese National Standard (CNS) A4 specification (210x 297 mm) ~ one page 14 559567

Cl D7 V. Description of the invention (13) It is 2 5-3 6 times of ordinary seawater desalination membrane. This is a special case of fully saturated gas at 43 ° C. [Conclusion] Table 4 Calculation and comparison results of membrane distillation method Temperature (° c) 25 30 43 43 (nano-scale micro-bubble gas-liquid ratio 1: 5) 43 Fully-bubble Vapor Load (lb-mole / hr) 0.057 0.066 1.131 > 2 Relative multiple relationship 1.00 1.16 19.84 > 40 Vapor Load For Water (%) 35.63 47.74 97.22 Relative multiple relationship 1.00 1.34 2.73 Vapor Load For Water (lb-mole / hr) 0.020 0.032 1.100 > 2 Relative multiple relationship 1.00 1.60 55 Vapor Load For Water (g / hr) 166 258 8,986 > 18000 relative multiple relationship 1.00 1.55 54.13 > 100 Flux (GFD) 0.00038 0.00058 20.3 > 40 251 relative multiple relationship 1.00 1.53 53421 > 100000 660526 From the above results it is possible It was found that the temperature strongly affected the water yield of the membrane distillation method. According to the data of 43 ° C, the operating temperature is lower than that of the MSF method, and the heat can be maintained by the energy released by the circulating pump work, and no additional heating device is required. The circulation at this time is more than 50,000 times 25 ° C, which is amazing. The operating conditions of the membrane distillation seawater desalination method have not been thoroughly explored in the past. We have found that under good design conditions, the flow rate is already 2-3 times higher than that of traditional RO. If the method of the present invention is added, the flow rate will be increased in multiples. The economic benefits are more significant. The above is an overview of the membrane distillation seawater desalination method of the present invention, the processing process of the system and the structure of the associated system; then, the paper size expected to be achieved by the present invention is adapted to the Chinese National Standard (CNS) A4 specification (210x 297) (Principle) Page 15 559567 V. Description of the invention (14 The effect of the statement is as follows: (1). The fresh water generation efficiency is fast. The main improvement of the present invention is to mix seawater 1 and gas 4 into the nano-scale microbubble treatment. After A η, re-enter, a large amount of seawater will be generated in the interior and cannot be seen by the naked eye. The seawater is almost saturated at 1 degree, and the microbubbles of the seawater make the seawater 1 thick and 2 (liquid phase-gas phase). The phase change from ground to water vapor can be large and fast ... / After the two organic M 71 are contacted, the water vapor 2 J person 2: and the shame penetrates into the condensed structure ... spitting ΑΦ 曰 ΑΛ; the above makes the present invention Large set of water can be generated quickly, and the production efficiency is very good. (2) · Cheap manufacturing cost

The present invention changes the method of heating the seawater by Zhi Dong + I, but changes the method of extracting the mixed gas 4 of seawater 1. It is better to use hot air if the rolling body 4 is used. The required energy capacity will not be too high. It is proved that the energy required by the entire system of the present invention is much lower than that of a conventional person, but the capacity of fresh water 3 can be effectively increased. Therefore, the present invention can indeed reduce the manufacturing cost of the fresh water 3, and the fresh water 3 can be produced in accordance with the economic cost by using the present invention. (3) Nano-grade micro-bubble pressure floatation device with long film life has good pre-treatment effect. It can remove impurities such as suspended solids, algae, colloidal solids in seawater, and effectively reduce the pollution / Ni # degree index (SDI: Silt Density Index), coupled with the high water content of the working water body has a strong disturbance effect (Turbulent Effect), which can effectively reduce the phenomenon of film surface pollution and clogging. (4) · Nano-level micro-bubble gas injection processing device to reduce the convective mass transmission resistance. The air bubbles can be miniaturized. The paper size is applicable to China National Standard (CNS) A4 (210x 297 mm). Page 16 559567 C7 _________D7__ V. Description of the invention (15) ---, making most of the bubbles smaller than the openings of the holes on the surface of the film. Shaanxi effectively suspends and disperses in the feed water to be treated. It can also reduce the resistance of convective mass transmission. . The surface tension of the package (5) · The working water body with large water production and high gas content has changed the mass transfer mode at the orifice of the surface of the hydrophobic membrane, and the gas-liquid ratio of the membrane orifice is increased, which makes the f-transmission resistance greatly reduced; The original liquid evaporates into vapor in the pores, and becomes a part of the liquid has been vaporized, which greatly increases the vapor flow, breaks the restriction of liquid-gas balance, and reduces the phenomenon of temperature polarization and concentration polarization, effectively increasing the amount of water produced. . It is worth mentioning that this improved method can be used in addition to the aforementioned Sea Water Desalination and Brackish Water Desalination treatment, as well as Effluent Reclamation and Wastewater Recovery ( Waste Water Reclamation) and Said Rice Wine Desalination. However, the above are only the preferred embodiments of the present invention. When the scope of implementation of the present invention cannot be limited by this, that is, the simple equivalent changes and modifications made according to the scope of the patent application and the content of the invention specification, All should still fall within the scope of the invention patent. This paper size applies the Chinese National Standard (CNS) A4 specification (210x 297 mm) Page 17 559567 C7 D7 V. Description of the invention (16) [Comparison of component numbers] B. Sea water 2 ·· • Water vapor 3 " · Fresh water 4 ·· • Gas 5 ··· Working liquid 10… Desalination device 11 " • Porous organic membrane 11 1… 孑 L gap 12 ·· • Condensation member 20… Container 30 " • Pumping motor 40… Gas supply 50. · • Cylinder 5 1… Bubble pressure valve 60 ·· • Nano-level micro-bubble device 70… Desalination device 7 • Porous organic membrane 72… Condensing member 73 ·· • Drain line 74… Fresh water line 80 ·· • • Negative pressure element 90… another container This paper size applies to China National Standard (CNS) A4 (210x 297 mm) Page 18

Claims (1)

559567 A8 B8 C8 Patent Application Scope • A membrane distillation seawater desalination method to supply seawater: take a container of water and treat it before filtering to remove some impurities; it contains the following steps: hold one of the seawater of a predetermined capacity, and add one to the sea Pre-float removal treatment: The filtered seawater is subjected to micro-bubble pressure and pre-sealing treatment to remove suspended solid impurities such as algae; a micro-bubble gas injection treatment: the floated feed water is subjected to micro-bubble gas water Mixing and reprocessing, so that seawater and gas are mixed into a homogeneous white mist etiquette working liquid, whose bubbles are saturated with water vapor; 4. Desalination treatment: The working liquid in a uniform gas-water mixed state is sent to a desalination device. The desalination device has one or more hydrophobic porous membranes inside, so that high gas content working liquids containing a large amount of saturated water vapor can easily pass through the porous hydrophobic membranes; and 5. Condensing component: The water vapor molecules that pass through the membranes are applied. Condensation produces fresh water. 2 · According to the membrane distillation seawater desalination method described in item 申请 of the patent application scope, wherein in step two, the gas pressurized into the seawater is air. 3. According to the membrane distillation seawater desalination method described in item 2 of the scope of the patent application, before the gas is mixed with seawater, it can be heated at high temperature in advance to make the mixed working liquid have a certain temperature. 4 · According to the membrane distillation seawater desalination method described in item 2 of the scope of the patent application, wherein the gas is mixed with seawater in a negative pressure suction method. 5 • According to the membrane distillation seawater desalination method described in item 1 of the scope of the patent application, ‘the operating temperature of the working liquid is recommended to be 30 to 60: 1. 6 · According to the membrane distillation seawater desalination method described in item 1 of the scope of patent application, the paper size of this paper applies the Chinese National Standard (CNS) A4 specification (210x 297 meals) Page 19 559567 a8 C8 _-_______ D8__ VI. Patent Application In the range 'in step two', a surfactant can be added to the feed water to stabilize or increase the number of bubbles. 7 · — Seed membrane distillation seawater desalination system, including: a container for containing seawater of a predetermined capacity, a side of the container is provided with a pipeline for pumping seawater; a gas supply device is connected to the pipeline, which has A gas supplier to pump pressurized gas into the seawater on the pipeline to make the seawater a working liquid with gas; a micro-bubble device is connected to one side of the gas supply device and can carry out working liquid Fragmentation and emulsification; a desalination device is connected to one side of the micro-bubble device and has one or more porous hydrophobic films; a condensation device is connected to the desalination device to pass through the porous hydrophobic films The water vapor is condensed to produce fresh water. 8. The membrane distillation seawater desalination system according to item 7 of the scope of the patent application, which further includes a pressure reducing cylinder, which is arranged on the side of the gas supplier for mixing the storage gas with the seawater. For the working fluid, the pressure reducing cylinder has a pressure relief valve, which is connected to the gas supplier, so that the working fluid can be circulated in the pipeline. 9. The membrane distillation seawater desalination system according to item 7 of the scope of the patent application, wherein the desalination device is cooled by passing air into the condensation device. 10 · The membrane distillation seawater desalination system according to item 7 of the scope of the patent application, wherein the desalination device is connected with a drainage pipe and a fresh water pipe, and the fresh water pipe is connected with a negative pressure element in parallel to The fresh water of the finished product is pumped to another paper size which is applicable to the Chinese National Standard (CNS) A4 specification (210 x 297 mm). Page 20 559567 6. The scope of patent application container storage. 1 1 · According to the patent application, where the light is 0 · 0 0 1 ～ 0 · 0 5 μχη, the water-based material film does not wound), hollow bond frame) 〇1 2 · According to the patent application, which includes these porous 3 A8 B8 C8 D8 The membrane distillation seawater desalination system described in item 7 of the scope. The pore size of the membrane used in the desalination device is about the microfiltration (MF) or ultrafiltration (UF). (Spiral i * dimension (hollow fiber) or plate-and-frame (plate and range of the membrane distillation seawater desalination system described in item 7), the membrane film tube of the general thin film can be operated in series or in parallel. This paper is applicable to Chinese national standards (CNS ) A4 size (210x 297 mm) page 21