Integrated micro energy recovery module, recovery method and artificial seawater desalination system

Abstract

This application relates to an integrated micro energy recovery module, recovery method, and its artificial seawater desalination system, applicable to portable seawater desalination equipment requiring only artificial power supply, low flow rate, high pressure. The integrated micro energy recovery module includes a plunger pump assembly, a check valve assembly, and a hydraulic directional valve. The energy recovery module includes: ① a set of dual plunger pumps, where in each operating cycle, one pump discharges high-pressure raw water while the other pump simultaneously draws water, shortening the system's output liquid pressure pulsation cycle; ② a directional valve that automatically switches direction using hydraulic energy; ③ a directional valve used to switch the operating states of the two plunger pumps, allowing them to alternate between suction and discharge states; ④ through the directional valve, high-pressure concentrated water is injected into the back side of the plunger, utilizing residual liquid pressure to propel the piston. The system's energy recovery efficiency can reach over 90%.

Description

Technical Field

[0001] This application relates to an integrated micro energy recovery module, recovery method and its artificial seawater desalination system, which is applicable to portable seawater desalination equipment that requires only artificial power supply, has a small flow rate, high pressure and is portable. Background Technology

[0002] In the reverse osmosis seawater desalination process, seawater is pressurized by external force (such as electricity or human effort) until its pressure exceeds its osmotic pressure. The seawater then passes through the reverse osmosis membrane to produce fresh water. This desalination process involves the discharge of a large amount of high-pressure concentrate at approximately 5-6 MPa. Directly discharging this concentrate would result in significant energy waste. Liquid residual pressure energy recovery technology converts this energy into energy needed for the next operation using mechanical devices. In other words, recovering the residual pressure energy of the concentrate can greatly reduce the external force required to increase the influent pressure.

[0003] Artificially powered seawater desalination reverse osmosis units refer to systems that use human power to drive seawater through the reverse osmosis system. The operating pressure required for desalination is the operating pressure of the reverse osmosis system, which produces fresh water using the reverse osmosis principle. The limitations of reverse osmosis systems in artificial seawater desalination are... A key issue in the widespread application of this technology is that the manual pressurization process is extremely strenuous. Therefore, how to improve the efficiency of manual labor is crucial. Improving efficiency and reducing energy consumption during equipment operation have become urgent problems to be solved. In reverse osmosis units, designs are implemented based on the characteristics of manual operation. The pump body structure and lever mechanism can improve manual labor efficiency, and the application of energy recovery devices can significantly reduce the operating costs of the equipment. Energy consumption is reduced, thereby achieving high efficiency in the artificially driven seawater desalination reverse osmosis process.

[0004] Currently, it is quite common for large-scale industrial seawater desalination reverse osmosis units to be equipped with energy recovery devices, which are generally divided into two categories: centrifugal and volumetric.

[0005] Centrifugal energy recovery devices require two energy conversions to recover residual pressure energy from liquids. A typical device is a turbine, which first converts the residual pressure energy into mechanical energy from turbine rotation, and then uses the impeller rotation to increase the pressure of the feed water. The conversion efficiency from concentrate energy to raw seawater energy is generally below 75%. This type of energy recovery device is suitable for larger reverse osmosis seawater desalination systems.

[0006] Volumetric energy recovery devices enable direct exchange of residual pressure energy. High-pressure media pushes a plunger to directly transfer pressure to the medium requiring pressurization, with an energy conversion efficiency typically exceeding 90%. Volumetric energy recovery devices mainly come in two types: rotor and plunger. Rotary energy recovery devices are represented by the PX (Pressure Exchanger) rotor-type pressure exchange energy recovery device from Energy Recovery Inc. (ERI) in the United States. Plunger-type valve-controlled energy recovery devices are represented by the DWEER (Work Exchange Energy Recovery) dual-pressure exchange energy recovery device from CALDER AG in Switzerland and the energy recovery tower from Aqualyng in Spain. The working principle of the plunger-type valve-controlled energy recovery device involves two large-diameter hydraulic cylinders. One cylinder recovers the high-pressure concentrate discharged during the reverse osmosis process, which pushes the plunger to exchange pressure with the raw water on the other side of the plunger. The other hydraulic cylinder receives low-pressure raw water, pushes the plunger, and discharges the low-pressure concentrate on the other side of the plunger. The two hydraulic cylinders alternately perform the process of seawater pressurization and concentrate discharge. Currently in industry, PLCs and solenoid valves are often used to control directional valves, thereby switching the two hydraulic cylinders. Energy recovery efficiency is generally higher than 90%. Like rotor-type pressure exchangers, plunger-type valve-controlled energy recovery devices belong to isobaric pressure exchange. The two energy recovery devices mentioned above... The raw water pressurized by the pressure exchanger cannot meet the working requirements of reverse osmosis, and it is necessary to add... A booster pump is provided to further pressurize it. This type of plunger-type pressure exchanger is typically used in large systems with a daily freshwater production of over 100 tons. Due to its structural limitations, the two hydraulic cylinders are relatively large, and the manufacturing process is also quite complex.

[0007] Currently, most energy recovery devices developed domestically and internationally are used in large-scale land-based reverse osmosis seawater desalination plants. If straight The energy recovery device from a large-scale seawater desalination reverse osmosis unit will then be used in a small-scale artificially driven seawater desalination reverse osmosis unit. In traditional energy recovery devices, there are problems such as difficulty in selection or inability to use them. However, the energy recovery system of this application is suitable for human use. In a small-scale seawater desalination reverse osmosis unit driven by an electric motor, there is no additional power supply, and the valves of the energy recovery device are switched without... The method relies on PLC and solenoid valve control, and cannot use an additional booster pump for further pressurization; the energy provided by manual operation is also limited. Since there are fewer electric-powered systems, energy recovery systems are needed to help save manpower.

[0008] The technical deficiency of "CN 202576050U, a manually driven seawater desalination device with energy recovery function" lies in the fact that the two steps of "automatic seawater intake" and "pressurization of the intake seawater" are separated. That is, each time the piston pump is manually driven, only one step can be achieved, either automatic seawater intake or pressurization of the intake seawater. The work efficiency of manual drive is not high. "CN213679950U, a portable miniature manual seawater desalination device" differs from this application in that its piston and reversing valve mechanism are driven by a planar four-bar linkage mechanism, rather than the hydraulic automatic drive of this application. The mechanical structure is complex and has many parts. The patents "CN102588240B Self-Boosting Energy Recovery High-Pressure Pump for Reverse Osmosis Seawater Desalination" and "CN203855441U Reverse Osmosis Seawater Desalination System Using a Self-Boosting Energy Recovery High-Pressure Pump" are characterized by the need for an additional guide valve to switch the movement of the directional valve; in addition, two pumps are required: a low-pressure raw water pump and a self-boosting energy recovery high-pressure pump, resulting in a large number of components and a large overall size. The technical drawback of "CN101782095B Differential Energy Recovery Device and Method for Seawater Desalination Systems" is that it still requires a directional valve drive device to switch the directional valve's direction, and it requires two stages of pumps—a low-pressure raw water pump and a high-pressure raw water pump—to complete the entire reverse osmosis system's working cycle, resulting in high energy consumption and making it difficult to operate manually. This presents significant challenges for manually operating seawater desalination devices. Summary of the Invention

[0009] The technical problem this application aims to solve is to provide an artificial seawater desalination residual pressure energy recovery system and method that can overcome the shortcomings of existing technologies. The system features a designed dual-plunger pump mechanical structure that can both manually drive the increase in pressure of low-pressure raw seawater and recover the residual pressure energy of high-pressure concentrated brine during the seawater desalination reverse osmosis process. The dual-plunger pump structure integrates seawater intake and pressurization, improving the efficiency of manual labor. The reversing valve can automatically switch water paths using residual liquid pressure energy and also recover residual liquid pressure energy to propel the plunger pump, saving manpower. The system's mechanical structure is optimized by integrating the dual-plunger pump and hydraulic reversing valve into a single unit. An integrated liquid flow distribution plate is designed on the pump body, integrating multiple liquid flow ports and check valve groups, simplifying the mechanical structure of the residual liquid pressure energy recovery system and achieving an integrated and portable design.

[0010] To solve the above-mentioned technical problems, this application provides an integrated micro energy recovery module, a recovery method, and an artificial seawater desalination system, which are achieved through the following technical solutions:

[0011] An integrated micro energy recovery module includes a plunger pump (1), a plunger pump (2), a plunger rod (3), and a reversing valve (9). The plunger pump (1) is equipped with a plunger (1-1) to divide it into a plunger chamber (1-2) and a plunger chamber (1-3). The plunger pump (2) is equipped with a plunger (2-1) to divide it into a plunger chamber (2-2) and a plunger chamber (2-3). The plunger (1-1) and the plunger (2-1) are fixed together on the plunger rod (3) to form a double plunger structure. The plunger chambers (1-2) and (2-3) simultaneously pump raw water during the movement of the double plunger structure. The raw water is pressurized to form high-pressure raw water. Both plunger chamber one (1-2) and plunger chamber four (2-3) are provided with high-pressure raw water outlets. The high-pressure raw water outlets are respectively connected to the inlet of the device and the reversing valve. The reversing valve moves and reverses under the push of the high-pressure raw water. Plunger chamber two (1-3) and plunger chamber three (2-2) are respectively connected to the reversing valve (9) through their respective liquid outlets. The high-pressure concentrate of the device is alternately connected to one of plunger chamber two (1-3) or plunger chamber three (2-2) through the reversing valve to help push plunger one (1-1) or plunger two (2-1) to move.

[0012] Preferably, the plunger pump one (1) is provided with a low-pressure raw water inlet one (1-4), which is connected to the plunger chamber one (1-2) through a one-way valve one (4). The plunger pump one (1) is provided with a high-pressure raw water outlet one (1-5), which is connected to a one-way valve two (5). The plunger chamber one (1-2) is connected to the liquid outlet five (9-1) provided on the reversing valve (9) through the liquid outlet one (1-6). The plunger chamber two (1-3) is connected to the liquid outlet seven (9-3) provided on the reversing valve (9) through the liquid outlet two (1-7).

[0013] The plunger pump 2 (2) is provided with a low-pressure raw water inlet 2 (2-4), which is connected to the plunger chamber 4 (2-3) through a one-way valve 3 (6). The plunger pump 2 (2) is provided with a high-pressure raw water outlet 2 (2-5), which is connected to a one-way valve 4 (7). The plunger chamber 4 (2-3) is connected to the liquid outlet 6 (9-2) provided on the reversing valve (9) through the liquid outlet 4 (2-6). The plunger chamber 3 (2-2) is connected to the liquid outlet 8 (9-4) provided on the reversing valve (9) through the liquid outlet 3 (2-7).

[0014] The first low-pressure raw water inlet (1-4) and the second low-pressure raw water inlet (2-4) are connected to the seawater pool (10);

[0015] The reversing valve (9) is provided with a liquid flow port nine (9-5), which is a high-pressure concentrated water inlet and is connected to the device;

[0016] The reversing valve (9) is provided with a liquid outlet (9-6), which is a low-pressure concentrate outlet and is connected to the concentrate tank (8).

[0017] Preferably, the reversing valve (9) is a two-position five-way valve.

[0018] Preferably, the diameter of the plunger rod (3) is 20%-45% of the diameter of the first plunger (1-1), and the diameter of the plunger rod (3) is 20%-45% of the diameter of the second plunger (2-1).

[0019] Preferably, the hydraulic energy recovery rate of the artificial seawater desalination residual pressure energy recovery system is = {(cross-sectional area of ​​plunger one or plunger two - cross-sectional area of ​​plunger rod) / cross-sectional area of ​​plunger one or plunger two} × 100%.

[0020] Preferably, the directional valve (9) is driven by hydraulically driven directional valve automatic directional switching.

[0021] Preferably, the plunger one (1-1), plunger two (2-1), plunger rod (3), and directional valve (9) and check valve (4, 5, 6, 7) are all equipped with sealing devices.

[0022] More preferably, the plunger one (1-1) and plunger two (2-1) are dynamic seals, and the sealing element is a Glyd ring seal.

[0023] More preferably, the plunger rod (3) is a dynamic seal, and the sealing element is a double-fit method in which an O-ring is embedded in the inner diameter of a Y-ring, and is fixed by a bearing and a gland.

[0024] Further preferred, the reversing valve (9) is a dynamic seal, the sealing element is a double Glyd ring seal, and it is made of polytetrafluoroethylene with a hardness of 85% or more.

[0025] Further preferably, the sealing element of the check valves (4, 5, 6, 7) is a mushroom valve type, including a spring, an O-ring and a mushroom-shaped valve core, and the sealing surface is a conical surface, which improves the sealing performance, opening and closing sensitivity and smoothness of the check valve, and the conical surface seal improves the guiding performance of the sealing element.

[0026] Further preferably, both plunger pump one (1) and plunger pump two (2) are provided with an integrated liquid flow distribution plate. The liquid flow distribution plate is provided with a low-pressure raw water inlet, a high-pressure raw water outlet, and a liquid flow port. A pair of one-way valves installed in opposite directions are provided on the low-pressure raw water inlet and the high-pressure raw water inlet. The one-way valve includes a spring, an O-ring, and a sealing surface.

[0027] The recovery method of the integrated micro energy recovery module of this application is achieved through the following technical solution: the plunger rod (3) is manually driven to move the double plunger structure in a certain direction. Either of the plunger chamber one (1-2) and plunger chamber four (2-3) automatically draws in the original seawater under pressure, while the other chamber pressurizes the original seawater to form high-pressure raw water. One of the high-pressure raw water flows into the reverse osmosis device for seawater filtration, and the other flows into the reversing valve to push the reversing valve to switch. The high-pressure concentrate of the reverse osmosis device flows into one of the plunger chamber two (1-3) or plunger chamber three (2-2) through the reversing valve to help the double plunger structure move in the same direction.

[0028] This application also provides an artificial seawater desalination system, including an integrated micro energy recovery module, wherein the device is a seawater desalination membrane module, the seawater desalination membrane module includes a membrane element, a membrane shell, a high-pressure seawater inlet, a high-pressure concentrate outlet, and a freshwater outlet, the freshwater outlet is connected to the freshwater pool, and the high-pressure concentrate outlet and the high-pressure seawater inlet are respectively connected to the integrated micro energy recovery module.

[0029] More preferably, the membrane element has a spiral structure, including a spiral layered structure and a water collection center tube disposed in the center of the spiral layered structure. The spiral layered structure is wound around the outside of the water collection center tube. The front end of the spiral membrane element is the inlet end, and the rear end of the spiral membrane element is the product water end and the concentrate end. The spiral layered structure includes a product water channel cloth, a first membrane sheet, a concentrate channel cloth, and a second membrane sheet. The water collection center tube is placed between the product water channel cloth and the first or second membrane sheet, and the water collection center tube is in direct contact and fused with the first or second membrane sheet. The product water channel cloth is placed between the first membrane sheet and the second membrane sheet. The upper and lower surfaces of the product water channel cloth respectively include a first side, a second side, and a third side not where the water collection center tube is disposed. The first side, the second side, and the third side of the upper and lower surfaces of the product water channel cloth are in direct contact and fused with the first membrane sheet and the second membrane sheet respectively to form a product water membrane bag.

[0030] More preferably, a desalination layer is provided on the side of the membrane facing the concentrate flow channel cloth, and a water guiding layer is provided on the side of the membrane facing the product water flow channel cloth.

[0031] More preferably, the width of the welding edge of the first side, the second side, or the third side is between 10 and 25,000 μm.

[0032] The beneficial effects of this application are:

[0033] (1) By using a double plunger pump and a reversing valve, the absorption of raw seawater, pressurization of raw seawater, energy recovery of high-pressure concentrate, recycling of concentrate, discharge of high-pressure concentrate and hydraulic drive of the reversing valve can be realized simultaneously, thereby improving work efficiency.

[0034] (2) The reversing valve is hydraulically driven and automatically reverses, eliminating the need for additional PLC circuits and solenoid valve control, thus saving costs.

[0035] (3) Because it has an energy recovery system, it can be used in small artificially driven seawater desalination reverse osmosis devices, and can directly reach the pressure required for reverse osmosis filtration without the need for an additional booster pump, thus reducing the cost of the device.

[0036] (4) The present invention utilizes a single rod and double plunger linkage method, which not only makes the structure of the whole system compact and miniaturized, but also greatly reduces the force required for manual drive by recovering and utilizing the energy of high pressure concentrated water, which is very labor-saving and improves its operating efficiency.

[0037] (5) The system has a simple mechanical structure, few parts, and features miniaturization and integration. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the integrated micro energy recovery module of this application.

[0039] Figure 2 This is a state diagram of the integrated micro energy recovery module of this application at position one.

[0040] Figure 3 This is a state diagram of the integrated micro energy recovery module of this application at position two.

[0041] Figure 4 This is a structural diagram of the artificial seawater desalination device applied for by this applicant.

[0042] Figure 5 This is a cross-sectional view of the artificial seawater desalination device applied for by this applicant.

[0043] Figure 6 This is a schematic diagram of the reverse osmosis spiral wound membrane element used in the artificial seawater desalination device applied for by this applicant.

[0044] Figure 7 This is a front view of the integrated fluid distribution plate inside the plunger pump in this application. Specific Implementation

[0045] The present application will now be described in further detail with reference to the accompanying drawings and embodiments:

[0046] The integrated micro energy recovery module A4 includes a plunger pump one (1), a plunger pump two (2), a plunger rod (3), a one-way valve one (4), a one-way valve two (5), a one-way valve three (6), a one-way valve four (7), a concentrate tank (8), a reversing valve (9), and a seawater tank (10).

[0047] The integrated micro energy recovery module disclosed in this application, such as Figure 1 As shown, there are two pumps: a plunger pump 1 (1) with a plunger 1 (1-1) inside and a plunger pump 2 (2) with a plunger 2 (2-1) inside. The plunger 1 (1-1) divides the plunger pump 1 (1) into a plunger cavity 1 (1-2) and a plunger cavity 2 (1-3). The plunger 2 (2-1) divides the plunger pump 2 (2) into a plunger cavity 3 (2-2) and a plunger cavity 4 (2-3). The plunger 1 (1-1) and the plunger 2 (2-1) are fixed together on the plunger rod (3).

[0048] The plunger pump 1 (1) is provided with a low-pressure raw water inlet 1 (1-4), which is connected to the plunger chamber 1 (1-2) through a check valve 1 (4). The plunger pump 1 (1) is provided with a high-pressure raw water outlet 1 (1-5), which is connected to a check valve 2 (5). The plunger chamber 1 (1-2) is connected to the liquid outlet 5 (9-1) provided on the reversing valve (9) through the liquid outlet 1 (1-6). The plunger chamber 2 (1-3) is connected to the liquid outlet 7 (9-3) provided on the reversing valve (9) through the liquid outlet 2 (1-7).

[0049] The plunger pump 2 (2) is provided with a low-pressure raw water inlet 2 (2-4), which is connected to the plunger chamber 4 (2-3) through a one-way valve 3 (6). The plunger pump 2 (2) is provided with a high-pressure raw water outlet 2 (2-5), which is connected to a one-way valve 4 (7). The plunger chamber 4 (2-3) is connected to the liquid outlet 6 (9-2) provided on the reversing valve (9) through the liquid outlet 4 (2-6). The plunger chamber 3 (2-2) is connected to the liquid outlet 8 (9-4) provided on the reversing valve (9) through the liquid outlet 3 (2-7).

[0050] The first low-pressure raw water inlet (1-4) and the second low-pressure raw water inlet (2-4) are connected to the seawater pool (10);

[0051] The reversing valve (9) is provided with a liquid flow port nine (9-5), which is a high-pressure concentrate inlet and is connected to the reverse osmosis device;

[0052] The reversing valve (9) is provided with a liquid outlet (9-6), which is a low-pressure concentrate outlet and is connected to the concentrate tank (8);

[0053] The diameter of the plunger rod (3) is 20%-45% of the diameter of the plunger one (1-1), and the diameter of the plunger rod (3) is 20%-45% of the diameter of the plunger two (2-1);

[0054] The reversing valve (9) is a two-position five-way valve;

[0055] The reversing valve (9) is driven by hydraulically driven reversing valve for automatic reversing;

[0056] The plunger 1 (1-1), plunger 2 (2-1), plunger rod (3), directional valve (9), and check valve (4, 5, 6, 7) are all equipped with sealing devices.

[0057] The working method of the residual pressure energy recovery system will be illustrated below with examples. Specific Implementation Example 1

[0059] like Figure 2 The diagram shown is a position-state diagram of the operation method of the residual pressure energy recovery system of this application:

[0060] When the two-position five-way reversing valve (9) is adjusted to position one, the second plunger chamber (1-3) of the plunger pump (1) is connected to the high-pressure concentrate side of the reverse osmosis unit through the reversing valve (9), and the third plunger chamber (2-2) of the plunger pump (2) is connected to the concentrate tank through the reversing valve (9).

[0061] Low-pressure raw seawater enters the plunger chamber four (2-3) of plunger pump two (2) through low-pressure raw water inlet two (2-4);

[0062] The low-pressure raw seawater in the plunger chamber (1-2) of the plunger pump (1) is pressurized and divided into two paths. One path enters the reverse osmosis device through the high-pressure raw water outlet (1-5) via the check valve (5), and the other path flows to the reversing valve through the liquid outlet (1-6), driving the reversing valve to switch to position two.

[0063] The specific operating method is as follows:

[0064] a) Manually drive the plunger rod (3) to move the second plunger (2-1) to the left to position one, and a momentary vacuum appears in the fourth plunger chamber (2-3). Seawater enters the fourth plunger chamber (2-3) through the one-way valve (6) via the low-pressure raw water inlet (2-4) to draw in the raw seawater.

[0065] b) At the same time, the concentrated water in the plunger chamber three (2-2) is discharged into the concentrated water pool (8) through the liquid outlet three (2-7) and liquid outlet eight (9-4) connected together;

[0066] c) At the same time, the plunger 1 (1-1) fixed on the plunger rod (3) is manually driven to move to position 1 to the left, and a momentary vacuum appears in the plunger chamber 2 (1-3). The high-pressure concentrate in the reverse osmosis device enters the plunger chamber 2 (1-3) through the liquid flow port 9 (9-5) set on the reversing valve (9), through the liquid flow port 7 (9-3) and liquid flow port 2 (1-7) connected together, and pushes the plunger rod (3) to move to the left.

[0067] d) At the same time, plunger one (1-1) pushes the seawater in plunger chamber one (1-2) into the reverse osmosis unit through high-pressure raw water outlet one (1-5) and one-way valve two (5);

[0068] e) At the same time, a portion of the seawater in plunger chamber one (1-2) enters the reversing valve (9) through liquid outlet one (1-6) and liquid outlet five (9-1), pushing the reversing valve (9) to automatically switch to position two;

[0069] f) At the same time, a stream of low-pressure concentrate in the reversing valve (9) flows into the plunger chamber (2-3) through the liquid flow port six (9-2) to recover and reuse the concentrate. Specific Implementation Example 2

[0071] like Figure 3 The diagram shown is a two-state diagram of the operation method of the residual pressure energy recovery system of this application:

[0072] When the two-position five-way reversing valve (9) is adjusted to position two, the plunger chamber three (2-2) of plunger pump two (2) is connected to the high-pressure concentrate side of the reverse osmosis unit through the reversing valve (9), and the plunger chamber two (1-3) of plunger pump one (1) is connected to the concentrate pool through the reversing valve (9).

[0073] Low-pressure raw seawater enters the plunger chamber (1-2) of plunger pump (1) through low-pressure raw water inlet (1-4).

[0074] The low-pressure raw seawater in the plunger chamber four (2-3) of the plunger pump two (2) is pressurized and divided into two paths. One path enters the reverse osmosis device through the high-pressure raw water outlet two (2-5) via the one-way valve four (7), and the other path flows to the reversing valve (9) through the liquid flow outlet four (2-6), driving the reversing valve (9) to switch to position one.

[0075] The specific operating method is as follows:

[0076] a) Manually drive the plunger rod (3) to move the plunger (1-1) to the right to position two. A momentary vacuum appears in the plunger chamber (1-2). Seawater enters the plunger chamber (1-2) through the one-way valve (4) and the low-pressure raw water inlet (1-4) to draw in the raw seawater.

[0077] b) At the same time, the concentrated water in the plunger chamber 2 (1-3) is discharged into the concentrated water pool (8) through the liquid outlet 10 (9-6) provided on the reversing valve (9) via the liquid outlet 2 (1-7) and liquid outlet 7 (9-3) connected together;

[0078] c) At the same time, the second plunger (2-1) fixed to the plunger rod (3) is driven by human power to move to position two to the right. A momentary vacuum appears in the third plunger chamber (2-2). The high-pressure concentrate in the reverse osmosis device enters the third plunger chamber (2-2) through the liquid flow port nine (9-5) set on the reversing valve (9), through the liquid flow port eight (9-4) and liquid flow port three (2-7) connected together, and pushes the plunger rod (3) to move to the right.

[0079] d) At the same time, plunger two (2-1) pushes the seawater in plunger chamber four (2-3) into the reverse osmosis unit through high-pressure raw water outlet two (2-5) and check valve four (7);

[0080] e) At the same time, a portion of the seawater in the plunger chamber four (2-3) enters the reversing valve (9) through the liquid flow port four (2-6) and the liquid flow port six (9-2), pushing the reversing valve (9) to automatically switch to position one;

[0081] f) At the same time, a stream of low-pressure concentrated water in the reversing valve (9) flows into the plunger chamber (1-2) through the liquid flow port five (9-1) to recover and reuse the concentrated water;

[0082] g) Then repeat steps (a) to (f) in a loop.

[0083] Compared with existing technologies, the integrated micro energy recovery module has the following advantages: ① It can provide the operating pressure required for the seawater desalination reverse osmosis process through manual force application; ② The dual-plunger pump structure ensures that each time the plunger rod is manually operated, one cylinder discharges high-pressure raw water while the other cylinder simultaneously draws in water, improving suction and drainage efficiency and shortening the system's output liquid pressure pulsation cycle; ③ The reversing valve automatically switches directions using hydraulic energy, eliminating the need for additional electrical energy or device control; ④ The reversing valve switches the working states of the two plunger cylinders, alternating between suction and drainage states. When the cylinder is draining water, high-pressure concentrate is injected into the back side of the plunger through the reversing valve channel, fully utilizing the residual energy of the high-pressure liquid to help the piston push forward, greatly saving manual force application, and achieving a system energy recovery efficiency of over 90%. During the reciprocating motion of the two plunger pumps, one plunger pump quickly discharges low-pressure concentrate through the reversing valve, while the other plunger pump draws in raw seawater through a check valve, preparing for the next cycle.

[0084] In practical applications, the aforementioned integrated micro energy recovery module and method can be applied to artificial seawater desalination. Specifically, a portable artificial seawater desalination device includes a handle (A1), a hinge (A2), an integrated micro energy recovery module (A4), a reverse osmosis device (A6), a pretreatment device (A7), a seawater pool (10), a concentrate pool (8), and a desalination pool (11).

[0085] The low-pressure raw water inlet one (1-4) and low-pressure raw water inlet two (2-4) of the portable artificial seawater desalination reverse osmosis device are connected to the seawater pool (10) through the pretreatment device (A7);

[0086] The plunger one (1-1) and plunger two (2-1) are provided with sealing devices;

[0087] The reversing valve (9) is provided with a spool sleeve, a spool core and a sealing device. Preferably, the diameter of the spool core is 20%-45% of the diameter of the plunger one (1-1) or the plunger two (2-1). More preferably, the reversing valve is a two-position five-way valve.

[0088] The reversing valve (9) is provided with a low-pressure concentrate discharge port one (4-3-2) and a low-pressure concentrate discharge port two (4-3-4), which are connected to the concentrate pool (8);

[0089] The reversing valve (9) is provided with a high-pressure concentrate inlet (4-3-3), which is connected to the high-pressure concentrate outlet (6-2) on the reverse osmosis unit (A6);

[0090] The reverse osmosis device (A6) is equipped with a spiral wound reverse osmosis membrane element, a sealing device, a high-pressure seawater inlet (6-1), a high-pressure concentrate outlet (6-2), and a freshwater outlet (6-3). The freshwater outlet (6-3) is connected to the freshwater pool (11).

[0091] The pretreatment device (A7) is equipped with PP filter cotton and nylon filter screen;

[0092] Preferably, the diameter of the plunger rod (3) is 20%-45% of the diameter of the first plunger (1-1), and the diameter of the plunger rod (3) is 20%-45% of the diameter of the second plunger (2-1);

[0093] Preferably, the recovery rate of the integrated micro energy recovery module is = {(cross-sectional area of ​​plunger one or plunger two - cross-sectional area of ​​plunger rod) / cross-sectional area of ​​plunger one or plunger two} × 100%;

[0094] Preferably, the directional valve (9) is driven by hydraulically driven directional valve automatic directional switching.

[0095] The portable artificial seawater desalination reverse osmosis device disclosed in this application operates as follows:

[0096] a) Manually drive the plunger rod (3), and the reversing valve (9) first reverses to position one. This position connects plunger chamber three (2-2) to the concentrate tank (8), and plunger chamber two (1-3) to the reverse osmosis device (A6).

[0097] b) After that, plunger two (2-1) moves to the bottom dead center, and a momentary vacuum appears in plunger chamber four (2-3). Seawater passes through the pretreatment device (A7), through one-way valve three (6), enters low-pressure raw water inlet two (2-4), and enters plunger chamber four (2-3) to realize the absorption of raw seawater;

[0098] c) At the same time, the concentrated brine in the plunger chamber three (2-2) is discharged into the concentrated water pool (8) through the liquid flow port three (2-7) and the low-pressure concentrated water discharge port two (4-3-4) set on the reversing valve (9), so as to realize the discharge of concentrated water;

[0099] d) At the same time, the plunger one (1-1) fixed on the plunger rod (3) is driven to the top dead center by human power, and a momentary vacuum appears in the plunger chamber two (1-3). The high pressure concentrate in the reverse osmosis device (A6) enters the plunger chamber two (1-3) through the high pressure concentrate outlet (6-2), the high pressure concentrate inlet (4-3-3) and the liquid flow port two (1-7) connected together on the reversing valve (9), and pushes the plunger rod (3) to move to the left, saving manpower and realizing the energy recovery of high pressure concentrate;

[0100] e) At the same time, the plunger (1-1) pushes the seawater in the plunger chamber (1-2) through the high-pressure raw water outlet (1-5) and the one-way valve (5) into the reverse osmosis unit (A6) to pressurize the raw seawater;

[0101] f) At the same time, a portion of the seawater in the plunger chamber (1-2) enters the reversing valve (9) through the liquid outlet (1-6), pushing the reversing valve (9) to switch to position two, thereby realizing the hydraulic drive automatic reversing of the reversing valve (9);

[0102] g) At the same time, a stream of low-pressure concentrated water in the reversing valve (9) flows into the plunger chamber (2-3) through the liquid flow port (2-6) to realize the recycling of concentrated water;

[0103] h) Manually drive the plunger rod (3), and the reversing valve (9) is switched to position two. This position connects plunger chamber two (1-3) to the concentrate tank (8), and plunger chamber three (2-2) to the reverse osmosis device (A6).

[0104] i) After that, the plunger (1-1) moves to the bottom dead center, and a momentary vacuum appears in the plunger chamber (1-2). Seawater enters the plunger chamber (1-2) through the one-way valve (4) and the low-pressure raw water inlet (1-4) to realize the absorption of raw seawater.

[0105] j) At the same time, the concentrated water in the plunger chamber 2 (1-3) is discharged into the concentrated water pool (8) through the liquid flow port 2 (1-7) and the low pressure concentrated water discharge port 1 (4-3-2) set on the reversing valve (9), thereby realizing the discharge of concentrated water;

[0106] k) At the same time, the second plunger (2-1) fixed on the plunger rod (3) is driven to the top dead center by human power, and a momentary vacuum appears in the third plunger chamber (2-2). The high-pressure concentrate in the reverse osmosis device (A6) enters the third plunger chamber (2-2) through the high-pressure concentrate inlet (4-3-3) set on the reversing valve (9) and through the liquid flow port (2-7), which helps the plunger rod (3) move to the right, saving manpower and realizing the energy recovery of the high-pressure concentrate;

[0107] l) At the same time, plunger two (2-1) pushes the seawater in plunger chamber four (2-3) through one-way valve four (7) and high-pressure raw water outlet two (2-5) into the reverse osmosis device (A6) to pressurize the raw seawater;

[0108] m) At the same time, a portion of the seawater in the plunger chamber four (2-3) enters the reversing valve (9) through the liquid flow port four (2-6), pushing the reversing valve (9) to switch to position one, thereby realizing the hydraulic automatic reversing of the reversing valve (9);

[0109] n) At the same time, a stream of low-pressure concentrated water in the reversing valve (9) flows into the plunger chamber (1-2) through the liquid outlet (1-6) to realize the recycling of concentrated water;

[0110] o) Then repeat steps (a) to (n) in a loop.

[0111] The core power component of the device, namely the integrated micro energy recovery module (A4), integrates two key components of the reverse osmosis seawater desalination system, namely the high-pressure plunger pump and the residual pressure energy recovery device, optimizing the system composition and equipment structure, making the device lightweight, compact, and portable. The plunger one (1-1) and plunger two (2-1) are fixed together on the plunger rod (3). When the handle (A1) is manually driven, the plunger pump one (1) and the plunger pump two (2) work simultaneously, which can simultaneously realize the absorption of raw seawater, pressurization of raw seawater, energy recovery of high-pressure concentrate, recycling of concentrate, discharge of low-pressure concentrate, and hydraulic drive automatic reversing of the reversing valve. Compared with the traditional single-cylinder manual reverse osmosis seawater desalination device, the working efficiency is improved, and the output water of the device is doubled under the same frequency of reciprocating motion of the handle.

[0112] like Figure 4 As shown, the typical process flow of the device is briefly described as follows:

[0113] When the handle is applied to the left, the reversing valve (9) is switched to position one first. At this time, the plunger chamber two (1-3) is connected to the concentrate end of the reverse osmosis device (A6), and the plunger chamber three (2-2) is connected to the concentrate pool (8).

[0114] Piston 1 (1-1) moves to the top dead center, and piston 2 (2-1) moves to the bottom dead center;

[0115] At this time, plunger one (1-1) does work, pressurizing the low-pressure raw seawater in plunger chamber one (1-2), so that this "high-pressure raw seawater" enters the reverse osmosis unit (A6) to carry out the reverse osmosis process; at the same time, the "high-pressure concentrate" at the concentrate end of the reverse osmosis unit enters the plunger chamber two (1-3) through the reversing valve (9), which helps plunger one (1-1) to do work.

[0116] At this time, as plunger 2 (2-1) moves to the lower dead center, the "low-pressure concentrate" in plunger chamber 3 (2-2) that has undergone residual pressure recovery is discharged into the concentrate pool (8) through the reversing valve; at the same time, a momentary vacuum appears in plunger chamber 4 (2-3), and a stream of "low-pressure raw seawater" is drawn from the seawater pool (10) into plunger chamber 4 (2-3);

[0117] In addition, a stream of "high-pressure raw seawater" in plunger chamber one (1-2) enters the reversing valve (9) through liquid outlet one (1-6), which helps the spool of the reversing valve (9) switch to position two; at the same time, a stream of "low-pressure concentrate" in the reversing valve (9) enters the plunger chamber four (2-3) through liquid outlet four (2-6), and concentrate is reused when the plunger does work again.

[0118] When the handle is applied to the right, the reversing valve (4-3) is switched to position two. At this time, the plunger chamber two (1-3) is connected to the concentrate tank (8), and the plunger chamber three (2-2) is connected to the concentrate end of the reverse osmosis device (A6).

[0119] Piston 1 (1-1) moves to the bottom dead center, and piston 2 (2-1) moves to the top dead center;

[0120] At this time, plunger 2 (2-1) does work, pressurizing the aforementioned "low-pressure raw seawater" and a stream of "low-pressure concentrate" in plunger chamber 4 (2-3), and then the "high-pressure raw seawater" enters the reverse osmosis unit (A6) to carry out the reverse osmosis process; at the same time, the "high-pressure concentrate" at the concentrate end of the reverse osmosis unit enters plunger chamber 3 (2-2) through the reversing valve (9), which helps plunger 2 (2-1) to do work;

[0121] At this time, as plunger 1 (1-1) moves to the bottom dead center, the "low-pressure concentrate" in plunger chamber 2 (1-3) that has undergone residual pressure recovery is discharged into the concentrate pool (8) through the reversing valve; at the same time, a momentary vacuum appears in plunger chamber 1 (1-2), and a stream of "low-pressure raw seawater" is drawn from the seawater pool (10) into plunger chamber 1 (1-2);

[0122] In addition, a stream of "high-pressure raw seawater" in plunger chamber four (2-3) enters the reversing valve (9) through liquid outlet four (2-6), which helps the spool of the reversing valve (9) switch to position one; at the same time, a stream of "low-pressure concentrate" in the reversing valve (9) enters the plunger chamber one (1-2) through liquid outlet one (1-6), and concentrate is reused when the plunger does work again.

[0123] In an example of a specific embodiment, such as Figure 6 The schematic diagram of the reverse osmosis spiral wound membrane element used in the reverse osmosis device A6 in this application is shown below:

[0124] The spiral-wound membrane element includes a spiral-wound layered structure, a water collection center tube (B6) disposed in the center of the spiral-wound layered structure, and a waterproof sealing fitting disposed on the outside of the spiral-wound layered structure. The spiral-wound layered structure is wound around the outside of the water collection center tube (B6). The front end of the spiral-wound membrane element is the water inlet end (B7), and a sealing ring (B5) is disposed near the water inlet end. The rear end of the spiral-wound membrane element is the product water end (B8) and the concentrate end (B9). The spiral-wound layered structure includes a product water flow channel fabric (B4) and a first membrane sheet (B2). The system comprises a concentrate channel fabric (B1) and a second membrane sheet (B3), with the water collection center tube (B6) positioned between the first membrane sheet (B2) and the product water channel fabric (B4), or positioned between the product water channel fabric (B4) and the second membrane sheet (B3). A desalination layer is provided on the side of the first membrane sheet (B2) facing the concentrate channel fabric (B1), and a water guiding layer is provided on the side of the first membrane sheet (B2) facing the product water channel fabric (B4). The spiral layered structure is wound around the water collection center tube (B6). On the outer side of the membrane, the upper and lower surfaces of the permeate flow channel fabric (B4) respectively include a first side (B41), a second side (B42), and a third side (B43) that are not used for the central water collection pipe. The first side (B41), the second side (B42), and the third side (B43) of the upper surface of the permeate flow channel fabric (B4) are directly contacted and fused with the first diaphragm (B2), and the first side (B41), the second side (B42), and the third side (B43) of the lower surface of the permeate flow channel fabric (B4) are directly contacted and fused with the second diaphragm (B3). At the same time, the product flow channel cloth (B4) is also directly in contact with the welding area of ​​the water collection center pipe (B6) and fused together. That is, the first, second and third sides of the upper and lower surfaces of the product flow channel cloth (B4) are directly in contact with the relative contact surfaces of the first membrane (B2) and the second membrane (B3) in a glue-free manner and are connected to the welding area of ​​the water collection center pipe to form a single product water membrane bag. The surface of the water collection center pipe is provided with an axial through hole, which is connected to the product water side of the product water membrane bag and the product water end of the water collection center pipe.The permeate flow channel fabric and the membrane can be welded using polymers (e.g., by electric heating with metal wires or electromagnetic induction heating with metal wires): The membrane is folded in half to form an n-shape, forming a first membrane (B2) and a second membrane (B3); the water collection center tube (B6) is placed between the first membrane (B2) and the permeate flow channel fabric (B4); metal wires are arranged on the first side (B41), the second side (B42), and the third side (B43) of the permeate flow channel fabric (B4) and extended and wound onto the water collection center tube (B6); the membrane, permeate flow channel fabric (B4), concentrate flow channel fabric (B1), and the metal wires arranged at the welding point are wound together onto the water collection center tube (B6); the metal wires are heated by a welding device, causing the polymer material at the welding point of the two materials to be welded (i.e., the permeate flow channel fabric and the membrane, and the membrane and the water collection center tube) to melt, and the two materials to be welded are connected to form a membrane bag. The welding process involves heating the metal wire to melt the polymer material at the weld joint. After the polymer material cools, atomic diffusion occurs between the weld surfaces, and the polymer materials are connected by chemical bonds. The welding temperature does not exceed 230 °C.

[0125] Regarding the materials of each component, for example, the diaphragm is made of low-melting-point polymers such as cellulose acetate, cellulose acetate ester, polyethylene, polysulfone, polyamide, aromatic polyamide, aromatic polyamide-hydrazide, and some nitrogen-containing aromatic polymers; the water production channel cloth is made of low-melting-point polymers such as PP polypropylene; the concentrate flow channel cloth is made of high-melting-point polymers such as PET thermoplastic polyester; and the water collection center tube is made of ABS plastic.

[0126] Furthermore, the width of the welding edge of the first side (B41), the second side (B42), or the third side (B43) is between 10 and 25,000 μm.

[0127] Furthermore, waterproof tape or a waterproof membrane can be wrapped around the roll-type layered structure.

[0128] Furthermore, the number of membrane bags in the membrane element can be 1-30.

[0129] Furthermore, the first or second membrane is one of a reverse osmosis spiral wound membrane element, a nanofiltration spiral wound membrane element, and an ultrafiltration spiral wound membrane element.

[0130] Furthermore, the first membrane (B2) and the second membrane (B3) are formed by folding the membranes in half, forming an n-shaped configuration. The spiral-wound membrane element of this invention directly welds the membrane to the water collection center pipe and the product water flow channel cloth to the membrane to form a novel spiral-wound membrane element structure. This eliminates the need for glue connections as in traditional methods and reduces the width of the membrane edge connection area, significantly increasing the effective filtration area of ​​the membrane. This improves the filtration efficiency of the spiral-wound membrane element, reduces costs, and enhances its practicality.

[0131] Considering the portability of this device, integrated design has been incorporated into some components to reduce the size and weight of the device.

[0132] like Figure 7 As shown, this application designs an integrated fluid distribution plate in a plunger pump. The fluid distribution plate integrates a low-pressure raw water inlet, a high-pressure raw water outlet, and a fluid outlet. A pair of one-way valves installed in opposite directions are provided on the low-pressure raw water inlet and the high-pressure raw water outlet. The one-way valve includes a spring, an O-ring, and a sealing surface.

[0133] Furthermore, for the plunger pump (1), C1 corresponds to the low-pressure raw water inlet (1-4) and is equipped with a check valve (4), C2 corresponds to the high-pressure raw water outlet (1-5) and is equipped with a check valve (5), and C3 is the first liquid outlet (1-6); for the plunger pump (2), C1 corresponds to the low-pressure raw water inlet (2-4) and is equipped with a check valve (6), C2 corresponds to the high-pressure raw water outlet (2-5) and is equipped with a check valve (7), and C3 is the first liquid outlet (2-6).

[0134] like Figure 4 As shown, this application integrates the dual-plunger pump and the reversing valve into a single unit, that is, integrates the power unit and the energy recovery unit to form an integrated micro energy recovery module. Figure 4 This is a cross-sectional view of the integrated micro energy recovery module.

[0135] Through the above integrated design, this device is small in size, with the high-pressure pump measuring only 6×3×12 cm and the entire machine weighing less than 1.2 kg. It is compact and portable, which can greatly meet the carrying needs of various different sea missions and has a wide range of uses.

[0136] In addition, this application verified the actual operation of the device through experiments and determined whether the device could meet the user's fresh water needs based on the test results.

[0137] The membrane element used in this embodiment is a cylinder with an external dimension of 15 cm in length and 5 cm in diameter.

[0138] Operating conditions were in accordance with GB / T 32373-2015 "Test Methods for Reverse Osmosis Membranes". The reverse osmosis feed water was a sodium chloride aqueous solution of 32,000 mg / L, the test water temperature was 25℃, and the operating frequency of the device handle was maintained at 1 time / second. During the test, the conductivity of the feed brine, the feed water operating pressure, the permeate flow rate, and the permeate conductivity were recorded every minute. Specific experimental data are shown in the table below:

[0139] Table 1. Desalination and desalination experiments of an artificial seawater desalination reverse osmosis device (this application).

[0140]

[0141] According to GB5749-1985 "Standards for Drinking Water Quality", the conductivity of drinking water should be below 1 mS / cm. As shown in the table above, the conductivity of the water produced by this device is significantly less than 1 mS / cm, meeting the drinking water standard. Furthermore, this device produces more than 15 L of water per hour. Based on the requirement of 1 L of drinking water per person per day in emergency situations, the hourly water production of this device can meet the daily drinking water needs of 15 people.

[0142] For comparison, we fabricated an artificial seawater desalination reverse osmosis unit with the same plunger pump size, but using a single-cylinder plunger pump. Under the same conditions—a 32,000 mg / L sodium chloride aqueous solution as the reverse osmosis feed water, a test water temperature of 25°C, and maintaining the operating frequency of the unit's control handle at 1 cycle / minute—we recorded data such as the conductivity of the feed brine, the feed water operating pressure, the permeate flow rate, and the permeate conductivity every minute. The data are shown in Table 2 below.

[0143] Table 2. Desalination and desalination experiments of an artificial seawater desalination reverse osmosis device (single plunger pump).

[0144]

[0145] As the data shows, the quality and quantity of the produced water from the single-plunger pump system deteriorated, with the production flow rate becoming half of that in Table 1. This is because, as a single-cylinder, single-acting plunger pump, its working principle relies on the reciprocating motion of the plunger within the cylinder, causing changes in the volume of the sealed working chamber to achieve water intake and discharge. Therefore, its operating characteristics are that both its discharge flow rate and output pressure are in the form of pulses, with each pulse cycle being the reciprocating cycle of the plunger pump. In this embodiment, the pulse cycle of the single-plunger pump is one minute, meaning 30 seconds are spent in the water intake state and 30 seconds in the water discharge state. The dual-plunger pump overcomes these shortcomings. Within each half-pulse cycle, one plunger pump draws water while the other discharges, improving the output efficiency of the plunger pump and doubling the amount of water discharged per unit time. Furthermore, according to the characteristics of the reverse osmosis process, a larger volume of water entering the reverse osmosis membrane element per unit time is more conducive to the turbulent movement and uniform distribution of seawater in the concentrate channel, thereby obtaining produced water with lower conductivity and better quality.

[0146] The above description is merely a preferred embodiment of this application and is not intended to limit the scope of this invention. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. An artificial seawater desalination system, characterized in that, The system includes an integrated micro energy recovery module, comprising a plunger pump one (1), a plunger pump two (2), a plunger rod (3), and a reversing valve (9). The plunger pump one (1) is equipped with a plunger one (1-1) to divide it into plunger chamber one (1-2) and plunger chamber two (1-3). The plunger pump two (2) is equipped with a plunger two (2-1) to divide it into plunger chamber three (2-2) and plunger chamber four (2-3). The plunger one (1-1) and plunger two (2-1) are connected together to the plunger rod (3) to form a double plunger structure. The plunger chamber one (1-2) and the plunger chamber four (2-3) are respectively connected to the liquid flow port one (1-6) and the liquid flow port four (2-6) directly to the reversing valve (9). The plunger chamber one... (1-2) and plunger chamber four (2-3) simultaneously extract and pressurize the raw water to form high-pressure raw water during the movement of the double plunger structure. Both plunger chamber one (1-2) and plunger chamber four (2-3) are provided with high-pressure raw water outlets. The high-pressure raw water outlets are respectively connected to the inlet of the device and the reversing valve. The reversing valve moves and reverses under the push of the high-pressure raw water. Plunger chamber two (1-3) and plunger chamber three (2-2) are respectively connected to the reversing valve (9) through their respective liquid outlets. The high-pressure concentrate of the device is alternately connected to one of plunger chamber two (1-3) or plunger chamber three (2-2) through the reversing valve to help plunger one (1-1) or plunger two (2-1) move. The device is a seawater desalination membrane module, which includes a membrane element, a membrane shell, a high-pressure seawater inlet, a high-pressure concentrate outlet, and a freshwater outlet. The freshwater outlet is connected to a freshwater pool, and the high-pressure concentrate outlet and the high-pressure seawater inlet are respectively connected to the integrated micro energy recovery module. The membrane element includes a spiral-wound layered structure with a central water collection tube (B6) located at the center of the spiral-wound layered structure. The spiral-wound layered structure includes a permeate channel fabric (B4), a membrane sheet, and a concentrate channel fabric (B1). The membrane sheet, permeate channel fabric (B4), concentrate channel fabric (B1), and metal wires arranged at the welding points are wound together onto the central water collection tube (B6). A welding device heats the metal wires, causing the permeate channel fabric, membrane sheet, and the polymer material at the welding points of the membrane sheet and the central water collection tube to melt. The two materials to be welded are connected to form a membrane bag. Welding is achieved by heating the metal wires to melt the polymer material at the welding points. After the polymer material cools, atomic diffusion occurs between the weld surfaces, and the welded polymer materials are connected by chemical bonds.

2. The artificial seawater desalination system according to claim 1, characterized in that, The plunger pump (1) is provided with a low-pressure raw water inlet (1-4), which is connected to the plunger chamber (1-2) through a check valve (4). The plunger pump (1) is provided with a high-pressure raw water outlet (1-5), which is connected to a check valve (5). The plunger chamber (1-2) is connected to the directional valve (9) through a liquid outlet (1-6) and the directional valve (9) through a liquid outlet (1-3). The plunger chamber (1-3) is connected to the directional valve (9) through a liquid outlet (1-7). The plunger pump 2 (2) is provided with a low-pressure raw water inlet 2 (2-4), which is connected to the plunger chamber 4 (2-3) through a one-way valve 3 (6). The plunger pump 2 (2) is provided with a high-pressure raw water outlet 2 (2-5), which is connected to a one-way valve 4 (7). The plunger chamber 4 (2-3) is connected to the liquid outlet 6 (9-2) provided on the reversing valve (9) through the liquid outlet 4 (2-6). The plunger chamber 3 (2-2) is connected to the liquid outlet 8 (9-4) provided on the reversing valve (9) through the liquid outlet 3 (2-7). The low-pressure raw water inlet one (1-4) and the low-pressure raw water inlet two (2-4) are connected to the seawater pool (10); The reversing valve (9) is provided with a liquid flow port nine (9-5), which is a high-pressure concentrated water inlet and is connected to the device; The reversing valve (9) is provided with a liquid outlet (9-6), which is a low-pressure concentrate outlet and is connected to the concentrate tank.

3. The artificial seawater desalination system according to claim 1, characterized in that, The reversing valve (9) is a two-position five-way valve.

4. The artificial seawater desalination system according to claim 1, characterized in that, The diameter of the plunger rod (3) is 20%-45% of the diameter of the plunger one (1-1), and the diameter of the plunger rod (3) is 20%-45% of the diameter of the plunger two (2-1).

5. The artificial seawater desalination system according to claim 1, characterized in that, Hydraulic energy recovery rate = {(cross-sectional area of ​​plunger one or plunger two - cross-sectional area of ​​plunger rod) / cross-sectional area of ​​plunger one or plunger two)} x 100%.

6. The artificial seawater desalination system according to claim 1, characterized in that, The reversing valve (9) is driven by hydraulically driven reversing valve for automatic reversing.

7. The artificial seawater desalination system according to claim 2, characterized in that, The plunger one (1-1), plunger two (2-1), plunger rod (3), directional valve (9), and check valve (4, 5, 6, 7) are all equipped with sealing devices.

8. The artificial seawater desalination system according to claim 1, characterized in that, The reversing valve (9) is provided with a spool sleeve, a spool core and a sealing device. The diameter of the spool core is 20%-45% of the diameter of the plunger one (1-1) or the plunger two (2-1).

9. The artificial seawater desalination system according to claim 1, characterized in that, Both plunger pump one (1) and plunger pump two (2) are designed with an integrated liquid distribution plate. The liquid distribution plate integrates a low-pressure raw water inlet, a high-pressure raw water outlet, and a liquid outlet. A pair of one-way valves installed in opposite directions are provided on the low-pressure raw water inlet and the high-pressure raw water outlet. The one-way valve includes a spring, an O-ring, and a sealing surface.

10. The artificial seawater desalination system according to claim 1, characterized in that, The system recycling method is as follows: The manual driving plunger rod (3) causes the double plunger structure to move in a certain direction. Either of the plunger chamber one (1-2) and plunger chamber four (2-3) automatically draws in the original seawater under pressure, while the other chamber pressurizes the original seawater to form high-pressure raw water. One of the high-pressure raw water flows into the device for seawater filtration, and the other flows into the reversing valve to push the reversing valve to switch. The high-pressure concentrate of the device flows into one of the plunger chambers two (1-3) or three (2-2) through the reversing valve to help the double plunger structure move in the same direction.

11. The artificial seawater desalination system according to claim 1, characterized in that, The membrane element has a spiral-wound structure, including a spiral-wound layered structure and a water collection center tube disposed in the center of the spiral-wound layered structure. The spiral-wound layered structure is wound around the outside of the water collection center tube. The front end of the spiral-wound membrane element is the inlet end, and the rear end of the spiral-wound membrane element is the product water end and the concentrate end. The spiral-wound layered structure includes a product water channel cloth, a first membrane sheet, a concentrate channel cloth, and a second membrane sheet. The water collection center tube is placed between the product water channel cloth and the first or second membrane sheet, and the water collection center tube is in direct contact with and welded to the first or second membrane sheet. The product water channel cloth is placed between the first membrane sheet and the second membrane sheet. The upper and lower surfaces of the product water channel cloth respectively include a first side, a second side, and a third side that are not where the water collection center tube is disposed. The first side, the second side, and the third side of the upper and lower surfaces of the product water channel cloth are in direct contact with and welded to the first membrane sheet and the second membrane sheet to form a product water membrane bag.

12. The artificial seawater desalination system according to claim 1, characterized in that, A desalination layer is provided on the side of the membrane facing the concentrate flow channel, and a water guiding layer is provided on the side of the membrane facing the product water flow channel.

13. The artificial seawater desalination system according to claim 11, characterized in that, The width of the welding edge line of the first, second, or third side is between 10 and 25,000 μm.

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